machdep.c revision 61220
125428Speter/*- 250477Speter * Copyright (c) 1992 Terrence R. Lambert. 325428Speter * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4139823Simp * All rights reserved. 525428Speter * 625428Speter * This code is derived from software contributed to Berkeley by 725428Speter * William Jolitz. 825428Speter * 925428Speter * Redistribution and use in source and binary forms, with or without 1025428Speter * modification, are permitted provided that the following conditions 1125428Speter * are met: 1225428Speter * 1. Redistributions of source code must retain the above copyright 1325428Speter * notice, this list of conditions and the following disclaimer. 1425428Speter * 2. Redistributions in binary form must reproduce the above copyright 1525428Speter * notice, this list of conditions and the following disclaimer in the 1625428Speter * documentation and/or other materials provided with the distribution. 1725428Speter * 3. All advertising materials mentioning features or use of this software 1825428Speter * must display the following acknowledgement: 1925428Speter * This product includes software developed by the University of 2025428Speter * California, Berkeley and its contributors. 2125428Speter * 4. Neither the name of the University nor the names of its contributors 2225428Speter * may be used to endorse or promote products derived from this software 2325428Speter * without specific prior written permission. 2425428Speter * 2525428Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2625428Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2725428Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2825428Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2925428Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3025428Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3125428Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3225428Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3325428Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3425428Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3525428Speter * SUCH DAMAGE. 3625428Speter * 3725428Speter * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 3825428Speter * $FreeBSD: head/sys/amd64/amd64/machdep.c 61220 2000-06-03 14:19:01Z bde $ 39217010Smarius */ 4025428Speter 4125428Speter#include "apm.h" 4225428Speter#include "ether.h" 4325428Speter#include "npx.h" 4425428Speter#include "opt_atalk.h" 4525428Speter#include "opt_compat.h" 4625428Speter#include "opt_cpu.h" 4725428Speter#include "opt_ddb.h" 4825428Speter#include "opt_inet.h" 4925428Speter#include "opt_ipx.h" 5025428Speter#include "opt_maxmem.h" 5125428Speter#include "opt_msgbuf.h" 5225428Speter#include "opt_perfmon.h" 5355205Speter#include "opt_smp.h" 5425428Speter#include "opt_user_ldt.h" 5525428Speter#include "opt_userconfig.h" 5625428Speter 5725428Speter#include <sys/param.h> 5825428Speter#include <sys/systm.h> 5925428Speter#include <sys/sysproto.h> 6092725Salfred#include <sys/signalvar.h> 6192725Salfred#include <sys/kernel.h> 6225428Speter#include <sys/linker.h> 6325428Speter#include <sys/malloc.h> 6425428Speter#include <sys/proc.h> 6525428Speter#include <sys/bio.h> 6625428Speter#include <sys/buf.h> 6760938Sjake#include <sys/reboot.h> 6825428Speter#include <sys/callout.h> 6925428Speter#include <sys/mbuf.h> 7025428Speter#include <sys/msgbuf.h> 7125428Speter#include <sys/sysent.h> 7225428Speter#include <sys/sysctl.h> 7325428Speter#include <sys/vmmeter.h> 7425428Speter#include <sys/bus.h> 7525428Speter 7625428Speter#include <vm/vm.h> 7725428Speter#include <vm/vm_param.h> 7825428Speter#include <sys/lock.h> 7925428Speter#include <vm/vm_kern.h> 8025428Speter#include <vm/vm_object.h> 8160938Sjake#include <vm/vm_page.h> 8225428Speter#include <vm/vm_map.h> 8325428Speter#include <vm/vm_pager.h> 8425428Speter#include <vm/vm_extern.h> 8525428Speter 8625428Speter#include <sys/user.h> 8792725Salfred#include <sys/exec.h> 8892725Salfred#include <sys/cons.h> 8925428Speter 9045720Speter#include <ddb/ddb.h> 9192725Salfred 9245720Speter#include <net/netisr.h> 9325428Speter 9492725Salfred#include <machine/cpu.h> 9525428Speter#include <machine/reg.h> 9625428Speter#include <machine/clock.h> 9725428Speter#include <machine/specialreg.h> 9825428Speter#include <machine/bootinfo.h> 9925428Speter#include <machine/ipl.h> 10025428Speter#include <machine/md_var.h> 10192725Salfred#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 10225428Speter#ifdef SMP 10325428Speter#include <machine/smp.h> 10492725Salfred#include <machine/globaldata.h> 10592725Salfred#endif 10625428Speter#ifdef PERFMON 107155669Sglebius#include <machine/perfmon.h> 108155669Sglebius#endif 109155669Sglebius 11055205Speter#ifdef OLD_BUS_ARCH 11125428Speter#include <i386/isa/isa_device.h> 11225428Speter#endif 11325428Speter#include <i386/isa/intr_machdep.h> 11425428Speter#include <isa/rtc.h> 11525428Speter#include <machine/vm86.h> 11653649Sjulian#include <sys/random.h> 11725428Speter#include <sys/ptrace.h> 11825428Speter#include <machine/sigframe.h> 119114163Ssam 120114163Ssamextern void init386 __P((int first)); 12125428Speterextern void dblfault_handler __P((void)); 12225428Speter 12325428Speterextern void printcpuinfo(void); /* XXX header file */ 12425428Speterextern void earlysetcpuclass(void); /* same header file */ 12525428Speterextern void finishidentcpu(void); 12625428Speterextern void panicifcpuunsupported(void); 12725428Speterextern void initializecpu(void); 12895702Sphk 12925428Speter#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 13025428Speter#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 13125428Speter 13225428Speterstatic void cpu_startup __P((void *)); 13325428SpeterSYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 13425428Speter 13525428Speterstatic MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf"); 13625428Speter 13795702Sphkint _udatasel, _ucodesel; 13895702Sphku_int atdevbase; 13995702Sphk 14095702Sphk#if defined(SWTCH_OPTIM_STATS) 14195702Sphkextern int swtch_optim_stats; 14295702SphkSYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 14395702Sphk CTLFLAG_RD, &swtch_optim_stats, 0, ""); 144155669SglebiusSYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 145155669Sglebius CTLFLAG_RD, &tlb_flush_count, 0, ""); 146159162Sglebius#endif 147217010Smarius 148217010Smarius#ifdef PC98 149217010Smariusstatic int ispc98 = 1; 150217010Smarius#else 151217010Smariusstatic int ispc98 = 0; 152217010Smarius#endif 153234098SjhbSYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 154234098Sjhb 155234098Sjhbint physmem = 0; 156256832Saeint cold = 1; 157256832Sae 158256832Saestatic void osendsig __P((sig_t catcher, int sig, sigset_t *mask, u_long code)); 159256832Sae 16053649Sjulianstatic int 16125428Spetersysctl_hw_physmem SYSCTL_HANDLER_ARGS 16295702Sphk{ 163215297Smarius int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 164215297Smarius return (error); 16595702Sphk} 16625428Speter 16725428SpeterSYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 16825428Speter 0, 0, sysctl_hw_physmem, "I", ""); 16925428Speter 17025428Speterstatic int 17125428Spetersysctl_hw_usermem SYSCTL_HANDLER_ARGS 17225428Speter{ 17325428Speter int error = sysctl_handle_int(oidp, 0, 17495702Sphk ctob(physmem - cnt.v_wire_count), req); 17595702Sphk return (error); 17625428Speter} 17725428Speter 17825428SpeterSYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 17995702Sphk 0, 0, sysctl_hw_usermem, "I", ""); 18095702Sphk 18195702Sphkstatic int 18225428Spetersysctl_hw_availpages SYSCTL_HANDLER_ARGS 18325428Speter{ 18425428Speter int error = sysctl_handle_int(oidp, 0, 18525428Speter i386_btop(avail_end - avail_start), req); 18625428Speter return (error); 18725428Speter} 18825428Speter 18995702SphkSYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 19095702Sphk 0, 0, sysctl_hw_availpages, "I", ""); 19125428Speter 19225428Speterstatic int 19377217Sphksysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS 19477217Sphk{ 19595702Sphk int error; 196114163Ssam 19795702Sphk /* Unwind the buffer, so that it's linear (possibly starting with 19895702Sphk * some initial nulls). 19995702Sphk */ 20095702Sphk error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 20195702Sphk msgbufp->msg_size-msgbufp->msg_bufr,req); 20295702Sphk if(error) return(error); 20395702Sphk if(msgbufp->msg_bufr>0) { 204114163Ssam error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 205114163Ssam msgbufp->msg_bufr,req); 206114163Ssam } 207114163Ssam return(error); 208114163Ssam} 209114163Ssam 210114163SsamSYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 211114163Ssam 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 212114163Ssam 213128195Sfjoestatic int msgbuf_clear; 214128195Sfjoe 215165569Ssamstatic int 216165569Ssamsysctl_machdep_msgbuf_clear SYSCTL_HANDLER_ARGS 217165569Ssam{ 218170530Ssam int error; 219170530Ssam error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 220124543Sonoe req); 22195702Sphk if (!error && req->newptr) { 22295702Sphk /* Clear the buffer and reset write pointer */ 22396174Simp bzero(msgbufp->msg_ptr,msgbufp->msg_size); 224177616Ssam msgbufp->msg_bufr=msgbufp->msg_bufx=0; 225114163Ssam msgbuf_clear=0; 226117817Ssam } 227195618Srpaulo return (error); 228124543Sonoe} 229114163Ssam 230124543SonoeSYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 231124543Sonoe &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 232124543Sonoe "Clear kernel message buffer"); 233124543Sonoe 234170530Ssamint bootverbose = 0, Maxmem = 0; 235170530Ssamlong dumplo; 23677217Sphk 23777217Sphkvm_offset_t phys_avail[10]; 238114232Sharti 239114232Sharti/* must be 2 less so 0 0 can signal end of chunks */ 240217010Smarius#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 241217010Smarius 242217010Smariusstatic vm_offset_t buffer_sva, buffer_eva; 243217010Smariusvm_offset_t clean_sva, clean_eva; 244217010Smariusstatic vm_offset_t pager_sva, pager_eva; 245217010Smarius 246217010Smarius#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 247217010Smarius 248217010Smariusstatic void 249217010Smariuscpu_startup(dummy) 250125015Sharti void *dummy; 251217010Smarius{ 252217010Smarius register unsigned i; 253217010Smarius register caddr_t v; 254114232Sharti vm_offset_t maxaddr; 255114232Sharti vm_size_t size = 0; 25625428Speter int firstaddr; 25725428Speter vm_offset_t minaddr; 25825428Speter 25925428Speter if (boothowto & RB_VERBOSE) 26025428Speter bootverbose++; 26125428Speter 26225428Speter /* 26325428Speter * Good {morning,afternoon,evening,night}. 26425428Speter */ 26595702Sphk printf(version); 26625428Speter earlysetcpuclass(); 267215297Smarius startrtclock(); 26895702Sphk printcpuinfo(); 26995702Sphk panicifcpuunsupported(); 27095702Sphk#ifdef PERFMON 27125428Speter perfmon_init(); 27225428Speter#endif 27325428Speter printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 27425428Speter /* 27525428Speter * Display any holes after the first chunk of extended memory. 27625428Speter */ 27753649Sjulian if (bootverbose) { 27825428Speter int indx; 27925428Speter 28025428Speter printf("Physical memory chunk(s):\n"); 281114163Ssam for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 282114163Ssam int size1 = phys_avail[indx + 1] - phys_avail[indx]; 28325428Speter 28425428Speter printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 285215297Smarius phys_avail[indx], phys_avail[indx + 1] - 1, size1, 286215297Smarius size1 / PAGE_SIZE); 287215297Smarius } 28825428Speter } 28925428Speter 29025428Speter /* 29125428Speter * Calculate callout wheel size 29225428Speter */ 29325428Speter for (callwheelsize = 1, callwheelbits = 0; 294156751Sandre callwheelsize < ncallout; 295156751Sandre callwheelsize <<= 1, ++callwheelbits) 296156751Sandre ; 297156751Sandre callwheelmask = callwheelsize - 1; 298217010Smarius 299217010Smarius /* 300217010Smarius * Allocate space for system data structures. 301156751Sandre * The first available kernel virtual address is in "v". 302156751Sandre * As pages of kernel virtual memory are allocated, "v" is incremented. 30325428Speter * As pages of memory are allocated and cleared, 30425428Speter * "firstaddr" is incremented. 30525428Speter * An index into the kernel page table corresponding to the 306217010Smarius * virtual memory address maintained in "v" is kept in "mapaddr". 307217010Smarius */ 308217010Smarius 309217010Smarius /* 310217010Smarius * Make two passes. The first pass calculates how much memory is 311217010Smarius * needed and allocates it. The second pass assigns virtual 31225428Speter * addresses to the various data structures. 313217010Smarius */ 31444521Swpaul firstaddr = 0; 31525428Speteragain: 31644521Swpaul v = (caddr_t)firstaddr; 31744521Swpaul 31895702Sphk#define valloc(name, type, num) \ 31944521Swpaul (name) = (type *)v; v = (caddr_t)((name)+(num)) 320114163Ssam#define valloclim(name, type, num, lim) \ 321114163Ssam (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 32244521Swpaul 32344521Swpaul valloc(callout, struct callout, ncallout); 32425428Speter valloc(callwheel, struct callout_tailq, callwheelsize); 32525428Speter 32625428Speter /* 32725428Speter * The nominal buffer size (and minimum KVA allocation) is BKVASIZE. 32825428Speter * For the first 64MB of ram nominally allocate sufficient buffers to 32925428Speter * cover 1/4 of our ram. Beyond the first 64MB allocate additional 33025428Speter * buffers to cover 1/20 of our ram over 64MB. 33125428Speter * 33225428Speter * factor represents the 1/4 x ram conversion. 33325428Speter */ 33425428Speter if (nbuf == 0) { 33525428Speter int factor = 4 * BKVASIZE / PAGE_SIZE; 33677217Sphk 33777217Sphk nbuf = 50; 33877217Sphk if (physmem > 1024) 33977217Sphk nbuf += min((physmem - 1024) / factor, 16384 / factor); 340114232Sharti if (physmem > 16384) 34125428Speter nbuf += (physmem - 16384) * 2 / (factor * 5); 34225428Speter } 34325428Speter 34425428Speter /* 34525428Speter * Do not allow the buffer_map to be more then 1/2 the size of the 34625428Speter * kernel_map. 34725428Speter */ 34825428Speter if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) / 34925428Speter (BKVASIZE * 2)) { 35025428Speter nbuf = (kernel_map->max_offset - kernel_map->min_offset) / 35125428Speter (BKVASIZE * 2); 35225428Speter printf("Warning: nbufs capped at %d\n", nbuf); 35344521Swpaul } 35444521Swpaul 35544542Swpaul nswbuf = max(min(nbuf/4, 256), 16); 35644542Swpaul 35744542Swpaul valloc(swbuf, struct buf, nswbuf); 358181138Santoine valloc(buf, struct buf, nbuf); 35995702Sphk v = bufhashinit(v); 360155708Sglebius 361155708Sglebius /* 362159162Sglebius * End of first pass, size has been calculated so allocate memory 363170311Sdavidch */ 364194917Snp if (firstaddr == 0) { 365194917Snp size = (vm_size_t)(v - firstaddr); 366194917Snp firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 367194917Snp if (firstaddr == 0) 368194918Snp panic("startup: no room for tables"); 369234098Sjhb goto again; 370234098Sjhb } 371234098Sjhb 37225428Speter /* 37325428Speter * End of second pass, addresses have been assigned 37425428Speter */ 37525428Speter if ((vm_size_t)(v - firstaddr) != size) 376221955Smarius panic("startup: table size inconsistency"); 37725428Speter 37825428Speter clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 37925428Speter (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 38025428Speter buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 38125428Speter (nbuf*BKVASIZE)); 38225428Speter pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 38325428Speter (nswbuf*MAXPHYS) + pager_map_size); 38425428Speter pager_map->system_map = 1; 38525428Speter exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 38625428Speter (16*(ARG_MAX+(PAGE_SIZE*3)))); 38744521Swpaul 38844521Swpaul /* 38995702Sphk * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 39095702Sphk * we use the more space efficient malloc in place of kmem_alloc. 39195702Sphk */ 392181138Santoine { 39395702Sphk vm_offset_t mb_map_size; 39495702Sphk 395170311Sdavidch mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 396221955Smarius mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 397221955Smarius mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 398221955Smarius bzero(mclrefcnt, mb_map_size / MCLBYTES); 399221955Smarius mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 400221955Smarius mb_map_size); 401221955Smarius mb_map->system_map = 1; 402221955Smarius } 403221955Smarius 404221955Smarius /* 405221955Smarius * Initialize callouts 406221955Smarius */ 407221955Smarius SLIST_INIT(&callfree); 408221955Smarius for (i = 0; i < ncallout; i++) { 409221955Smarius callout_init(&callout[i]); 410221955Smarius callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 411221955Smarius SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 412221955Smarius } 41325428Speter 41425428Speter for (i = 0; i < callwheelsize; i++) { 41525428Speter TAILQ_INIT(&callwheel[i]); 41625428Speter } 417215297Smarius 418215297Smarius#if defined(USERCONFIG) 419215297Smarius userconfig(); 42025428Speter cninit(); /* the preferred console may have changed */ 42125428Speter#endif 42225428Speter 42325428Speter printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 42425428Speter ptoa(cnt.v_free_count) / 1024); 42525428Speter 42625428Speter /* 42725428Speter * Set up buffers, so they can be used to read disk labels. 42844165Sjulian */ 42944165Sjulian bufinit(); 43025428Speter vm_pager_bufferinit(); 43125428Speter 43225428Speter#ifdef SMP 43325428Speter /* 43425428Speter * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 43525428Speter */ 43625428Speter mp_start(); /* fire up the APs and APICs */ 43725428Speter mp_announce(); 43844165Sjulian#endif /* SMP */ 43944165Sjulian} 44025428Speter 44125428Speterint 44225428Speterregister_netisr(num, handler) 44325428Speter int num; 44425428Speter netisr_t *handler; 44525428Speter{ 44625428Speter 44744165Sjulian if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 44844165Sjulian printf("register_netisr: bad isr number: %d\n", num); 44944165Sjulian return (EINVAL); 45025428Speter } 45125428Speter netisrs[num] = handler; 45225428Speter return (0); 45325428Speter} 45425428Speter 45525428Speterint 45625428Speterunregister_netisr(num) 45725428Speter int num; 45825428Speter{ 45925428Speter 46025428Speter if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 46125428Speter printf("unregister_netisr: bad isr number: %d\n", num); 46225428Speter return (EINVAL); 46325428Speter } 46425428Speter netisrs[num] = NULL; 46525428Speter return (0); 46625428Speter} 46725428Speter 46825428Speter/* 46925428Speter * Send an interrupt to process. 47025428Speter * 47125428Speter * Stack is set up to allow sigcode stored 47277217Sphk * at top to call routine, followed by kcall 47377217Sphk * to sigreturn routine below. After sigreturn 47477217Sphk * resets the signal mask, the stack, and the 47577217Sphk * frame pointer, it returns to the user 47677217Sphk * specified pc, psl. 47777217Sphk */ 47877217Sphkstatic void 47977217Sphkosendsig(catcher, sig, mask, code) 480114163Ssam sig_t catcher; 481114163Ssam int sig; 482114163Ssam sigset_t *mask; 483114163Ssam u_long code; 484114163Ssam{ 485114163Ssam struct osigframe sf; 486114163Ssam struct osigframe *fp; 487114163Ssam struct proc *p; 488114163Ssam struct sigacts *psp; 489128195Sfjoe struct trapframe *regs; 490128195Sfjoe int oonstack; 491165569Ssam 492165569Ssam p = curproc; 493165569Ssam psp = p->p_sigacts; 494205515Srpaulo regs = p->p_md.md_regs; 49577217Sphk oonstack = p->p_sigstk.ss_flags & SS_ONSTACK; 49677217Sphk 49777217Sphk /* Allocate and validate space for the signal handler context. */ 49877217Sphk if ((p->p_flag & P_ALTSTACK) && !oonstack && 49977217Sphk SIGISMEMBER(psp->ps_sigonstack, sig)) { 50077217Sphk fp = (struct osigframe *)(p->p_sigstk.ss_sp + 50177217Sphk p->p_sigstk.ss_size - sizeof(struct osigframe)); 50277217Sphk p->p_sigstk.ss_flags |= SS_ONSTACK; 50377217Sphk } else 50477217Sphk fp = (struct osigframe *)regs->tf_esp - 1; 50577217Sphk 50677217Sphk /* 50777217Sphk * grow_stack() will return 0 if *fp does not fit inside the stack 50877217Sphk * and the stack can not be grown. 50977217Sphk * useracc() will return FALSE if access is denied. 51077217Sphk */ 51177217Sphk if (grow_stack(p, (int)fp) == 0 || 51277217Sphk !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 513114163Ssam /* 514114163Ssam * Process has trashed its stack; give it an illegal 515114163Ssam * instruction to halt it in its tracks. 516114163Ssam */ 517114163Ssam SIGACTION(p, SIGILL) = SIG_DFL; 518114163Ssam SIGDELSET(p->p_sigignore, SIGILL); 519114163Ssam SIGDELSET(p->p_sigcatch, SIGILL); 520114163Ssam SIGDELSET(p->p_sigmask, SIGILL); 521114163Ssam psignal(p, SIGILL); 522114163Ssam return; 523114163Ssam } 524114163Ssam 525114163Ssam /* Translate the signal if appropriate. */ 526128195Sfjoe if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 527128195Sfjoe sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 528128195Sfjoe 529128195Sfjoe /* Build the argument list for the signal handler. */ 530165569Ssam sf.sf_signum = sig; 531165569Ssam sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 532165569Ssam if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 533205515Srpaulo /* Signal handler installed with SA_SIGINFO. */ 53477217Sphk sf.sf_arg2 = (register_t)&fp->sf_siginfo; 53577217Sphk sf.sf_siginfo.si_signo = sig; 53677217Sphk sf.sf_siginfo.si_code = code; 53777217Sphk sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 53877217Sphk } else { 53994489Simp /* Old FreeBSD-style arguments. */ 54096174Simp sf.sf_arg2 = code; 541177616Ssam sf.sf_addr = regs->tf_err; 542114163Ssam sf.sf_ahu.sf_handler = catcher; 543117817Ssam } 544195618Srpaulo 54577217Sphk /* Save most if not all of trap frame. */ 54677217Sphk sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 54777217Sphk sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 548114163Ssam sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 549116819Ssam sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 550114163Ssam sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 551114163Ssam sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 552114163Ssam sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 553124543Sonoe sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 554170530Ssam sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 555170530Ssam sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 556114163Ssam sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 557114163Ssam sf.sf_siginfo.si_sc.sc_gs = rgs(); 558114163Ssam sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 559116819Ssam 560116819Ssam /* Build the signal context to be used by osigreturn(). */ 561116819Ssam sf.sf_siginfo.si_sc.sc_onstack = oonstack; 562116819Ssam SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 563116819Ssam sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 564217010Smarius sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 565114232Sharti sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 566114232Sharti sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 567114232Sharti sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 568114232Sharti sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 569114232Sharti 570114232Sharti /* 571114232Sharti * If we're a vm86 process, we want to save the segment registers. 572115690Sharti * We also change eflags to be our emulated eflags, not the actual 573114232Sharti * eflags. 574125015Sharti */ 575114232Sharti if (regs->tf_eflags & PSL_VM) { 576114232Sharti /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 577114232Sharti struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 578217010Smarius struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 579114232Sharti 580114232Sharti sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 581114232Sharti sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 582114232Sharti sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 583114232Sharti sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 584114232Sharti 585114232Sharti if (vm86->vm86_has_vme == 0) 586114232Sharti sf.sf_siginfo.si_sc.sc_ps = 587114232Sharti (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 588125015Sharti (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 589114232Sharti 590114232Sharti /* See sendsig() for comments. */ 591114232Sharti tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 592114232Sharti } 593114232Sharti 594114232Sharti /* Copy the sigframe out to the user's stack. */ 595114232Sharti if (copyout(&sf, fp, sizeof(*fp)) != 0) { 596114232Sharti /* 597114232Sharti * Something is wrong with the stack pointer. 598114232Sharti * ...Kill the process. 59925428Speter */ 60025428Speter sigexit(p, SIGILL); 60125428Speter } 60225428Speter 60325428Speter regs->tf_esp = (int)fp; 60425428Speter regs->tf_eip = PS_STRINGS - szosigcode; 60525428Speter regs->tf_cs = _ucodesel; 60625428Speter regs->tf_ds = _udatasel; 60725428Speter regs->tf_es = _udatasel; 608221955Smarius regs->tf_fs = _udatasel; 609221955Smarius load_gs(_udatasel); 610221955Smarius regs->tf_ss = _udatasel; 611221955Smarius} 612221955Smarius 613221955Smariusvoid 614221955Smariussendsig(catcher, sig, mask, code) 61525428Speter sig_t catcher; 61625428Speter int sig; 61725428Speter sigset_t *mask; 61825428Speter u_long code; 61925428Speter{ 62025428Speter struct sigframe sf; 621215297Smarius struct proc *p; 62225428Speter struct sigacts *psp; 62325428Speter struct trapframe *regs; 62425428Speter struct sigframe *sfp; 62525428Speter int oonstack; 62625428Speter 62725428Speter p = curproc; 62825428Speter psp = p->p_sigacts; 629217013Smarius if (SIGISMEMBER(psp->ps_osigset, sig)) { 630217013Smarius osendsig(catcher, sig, mask, code); 631217013Smarius return; 632217013Smarius } 633217013Smarius regs = p->p_md.md_regs; 634217013Smarius oonstack = p->p_sigstk.ss_flags & SS_ONSTACK; 635217013Smarius 636217013Smarius /* Save user context. */ 637217013Smarius bzero(&sf, sizeof(sf)); 638155669Sglebius sf.sf_uc.uc_sigmask = *mask; 639155669Sglebius sf.sf_uc.uc_stack = p->p_sigstk; 640155669Sglebius sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 641155669Sglebius sf.sf_uc.uc_mcontext.mc_gs = rgs(); 642155669Sglebius bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 643155669Sglebius 644155669Sglebius /* Allocate and validate space for the signal handler context. */ 645155669Sglebius if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 646217010Smarius SIGISMEMBER(psp->ps_sigonstack, sig)) { 647155669Sglebius sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 648155669Sglebius p->p_sigstk.ss_size - sizeof(struct sigframe)); 649155669Sglebius p->p_sigstk.ss_flags |= SS_ONSTACK; 650155669Sglebius } else 651155669Sglebius sfp = (struct sigframe *)regs->tf_esp - 1; 652155669Sglebius 653155669Sglebius /* 654155669Sglebius * grow_stack() will return 0 if *sfp does not fit inside the stack 655155669Sglebius * and the stack can not be grown. 656155669Sglebius * useracc() will return FALSE if access is denied. 657155669Sglebius */ 658155669Sglebius if (grow_stack(p, (int)sfp) == 0 || 659155669Sglebius !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 660155669Sglebius /* 661155669Sglebius * Process has trashed its stack; give it an illegal 662155669Sglebius * instruction to halt it in its tracks. 663159162Sglebius */ 664159162Sglebius#ifdef DEBUG 665170311Sdavidch printf("process %d has trashed its stack\n", p->p_pid); 666186260Sgnn#endif 667194917Snp SIGACTION(p, SIGILL) = SIG_DFL; 668186260Sgnn SIGDELSET(p->p_sigignore, SIGILL); 669194918Snp SIGDELSET(p->p_sigcatch, SIGILL); 670234098Sjhb SIGDELSET(p->p_sigmask, SIGILL); 671234098Sjhb psignal(p, SIGILL); 672234098Sjhb return; 673155669Sglebius } 674155669Sglebius 675155669Sglebius /* Translate the signal if appropriate. */ 676155669Sglebius if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 677155669Sglebius sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 678155669Sglebius 679155669Sglebius /* Build the argument list for the signal handler. */ 680155669Sglebius sf.sf_signum = sig; 681155669Sglebius sf.sf_ucontext = (register_t)&sfp->sf_uc; 682155669Sglebius if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 683155669Sglebius /* Signal handler installed with SA_SIGINFO. */ 684155669Sglebius sf.sf_siginfo = (register_t)&sfp->sf_si; 685155669Sglebius sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 686155669Sglebius 687155669Sglebius /* Fill siginfo structure. */ 688155669Sglebius sf.sf_si.si_signo = sig; 689155669Sglebius sf.sf_si.si_code = code; 690155669Sglebius sf.sf_si.si_addr = (void *)regs->tf_err; 691155669Sglebius } else { 692155669Sglebius /* Old FreeBSD-style arguments. */ 693155669Sglebius sf.sf_siginfo = code; 694155669Sglebius sf.sf_addr = regs->tf_err; 695155669Sglebius sf.sf_ahu.sf_handler = catcher; 696155669Sglebius } 697155669Sglebius 698155669Sglebius /* 699155669Sglebius * If we're a vm86 process, we want to save the segment registers. 700155669Sglebius * We also change eflags to be our emulated eflags, not the actual 701155669Sglebius * eflags. 702155669Sglebius */ 703156751Sandre if (regs->tf_eflags & PSL_VM) { 704156751Sandre struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 705156751Sandre struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 706156751Sandre 707156751Sandre sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 708156751Sandre sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 709156751Sandre sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 710156751Sandre sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 711156751Sandre 712156751Sandre if (vm86->vm86_has_vme == 0) 713217010Smarius sf.sf_uc.uc_mcontext.mc_eflags = 714156751Sandre (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 715156751Sandre (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 716217010Smarius 717156751Sandre /* 718156751Sandre * We should never have PSL_T set when returning from vm86 719156751Sandre * mode. It may be set here if we deliver a signal before 720156751Sandre * getting to vm86 mode, so turn it off. 721156751Sandre * 722156751Sandre * Clear PSL_NT to inhibit T_TSSFLT faults on return from 723156751Sandre * syscalls made by the signal handler. This just avoids 724156751Sandre * wasting time for our lazy fixup of such faults. PSL_NT 725156751Sandre * does nothing in vm86 mode, but vm86 programs can set it 726156751Sandre * almost legitimately in probes for old cpu types. 727156751Sandre */ 728156751Sandre tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 729156751Sandre } 73025428Speter 731 /* Copy the sigframe out to the user's stack. */ 732 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 733 /* 734 * Something is wrong with the stack pointer. 735 * ...Kill the process. 736 */ 737 sigexit(p, SIGILL); 738 } 739 740 regs->tf_esp = (int)sfp; 741 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 742 regs->tf_cs = _ucodesel; 743 regs->tf_ds = _udatasel; 744 regs->tf_es = _udatasel; 745 regs->tf_fs = _udatasel; 746 load_gs(_udatasel); 747 regs->tf_ss = _udatasel; 748} 749 750/* 751 * System call to cleanup state after a signal 752 * has been taken. Reset signal mask and 753 * stack state from context left by sendsig (above). 754 * Return to previous pc and psl as specified by 755 * context left by sendsig. Check carefully to 756 * make sure that the user has not modified the 757 * state to gain improper privileges. 758 */ 759int 760osigreturn(p, uap) 761 struct proc *p; 762 struct osigreturn_args /* { 763 struct osigcontext *sigcntxp; 764 } */ *uap; 765{ 766 struct trapframe *regs; 767 struct osigcontext *scp; 768 int eflags; 769 770 regs = p->p_md.md_regs; 771 scp = uap->sigcntxp; 772 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 773 return (EFAULT); 774 eflags = scp->sc_ps; 775 if (eflags & PSL_VM) { 776 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 777 struct vm86_kernel *vm86; 778 779 /* 780 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 781 * set up the vm86 area, and we can't enter vm86 mode. 782 */ 783 if (p->p_addr->u_pcb.pcb_ext == 0) 784 return (EINVAL); 785 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 786 if (vm86->vm86_inited == 0) 787 return (EINVAL); 788 789 /* Go back to user mode if both flags are set. */ 790 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 791 trapsignal(p, SIGBUS, 0); 792 793 if (vm86->vm86_has_vme) { 794 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 795 (eflags & VME_USERCHANGE) | PSL_VM; 796 } else { 797 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 798 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 799 } 800 tf->tf_vm86_ds = scp->sc_ds; 801 tf->tf_vm86_es = scp->sc_es; 802 tf->tf_vm86_fs = scp->sc_fs; 803 tf->tf_vm86_gs = scp->sc_gs; 804 tf->tf_ds = _udatasel; 805 tf->tf_es = _udatasel; 806 tf->tf_fs = _udatasel; 807 } else { 808 /* 809 * Don't allow users to change privileged or reserved flags. 810 */ 811 /* 812 * XXX do allow users to change the privileged flag PSL_RF. 813 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 814 * should sometimes set it there too. tf_eflags is kept in 815 * the signal context during signal handling and there is no 816 * other place to remember it, so the PSL_RF bit may be 817 * corrupted by the signal handler without us knowing. 818 * Corruption of the PSL_RF bit at worst causes one more or 819 * one less debugger trap, so allowing it is fairly harmless. 820 */ 821 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 822 return (EINVAL); 823 } 824 825 /* 826 * Don't allow users to load a valid privileged %cs. Let the 827 * hardware check for invalid selectors, excess privilege in 828 * other selectors, invalid %eip's and invalid %esp's. 829 */ 830 if (!CS_SECURE(scp->sc_cs)) { 831 trapsignal(p, SIGBUS, T_PROTFLT); 832 return (EINVAL); 833 } 834 regs->tf_ds = scp->sc_ds; 835 regs->tf_es = scp->sc_es; 836 regs->tf_fs = scp->sc_fs; 837 } 838 839 /* Restore remaining registers. */ 840 regs->tf_eax = scp->sc_eax; 841 regs->tf_ebx = scp->sc_ebx; 842 regs->tf_ecx = scp->sc_ecx; 843 regs->tf_edx = scp->sc_edx; 844 regs->tf_esi = scp->sc_esi; 845 regs->tf_edi = scp->sc_edi; 846 regs->tf_cs = scp->sc_cs; 847 regs->tf_ss = scp->sc_ss; 848 regs->tf_isp = scp->sc_isp; 849 850 if (scp->sc_onstack & 01) 851 p->p_sigstk.ss_flags |= SS_ONSTACK; 852 else 853 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 854 SIGSETOLD(p->p_sigmask, scp->sc_mask); 855 SIG_CANTMASK(p->p_sigmask); 856 regs->tf_ebp = scp->sc_fp; 857 regs->tf_esp = scp->sc_sp; 858 regs->tf_eip = scp->sc_pc; 859 regs->tf_eflags = eflags; 860 return (EJUSTRETURN); 861} 862 863int 864sigreturn(p, uap) 865 struct proc *p; 866 struct sigreturn_args /* { 867 ucontext_t *sigcntxp; 868 } */ *uap; 869{ 870 struct trapframe *regs; 871 ucontext_t *ucp; 872 int cs, eflags; 873 874 ucp = uap->sigcntxp; 875 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 876 return (EFAULT); 877 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 878 return (osigreturn(p, (struct osigreturn_args *)uap)); 879 880 /* 881 * Since ucp is not an osigcontext but a ucontext_t, we have to 882 * check again if all of it is accessible. A ucontext_t is 883 * much larger, so instead of just checking for the pointer 884 * being valid for the size of an osigcontext, now check for 885 * it being valid for a whole, new-style ucontext_t. 886 */ 887 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 888 return (EFAULT); 889 890 regs = p->p_md.md_regs; 891 eflags = ucp->uc_mcontext.mc_eflags; 892 if (eflags & PSL_VM) { 893 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 894 struct vm86_kernel *vm86; 895 896 /* 897 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 898 * set up the vm86 area, and we can't enter vm86 mode. 899 */ 900 if (p->p_addr->u_pcb.pcb_ext == 0) 901 return (EINVAL); 902 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 903 if (vm86->vm86_inited == 0) 904 return (EINVAL); 905 906 /* Go back to user mode if both flags are set. */ 907 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 908 trapsignal(p, SIGBUS, 0); 909 910 if (vm86->vm86_has_vme) { 911 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 912 (eflags & VME_USERCHANGE) | PSL_VM; 913 } else { 914 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 915 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 916 } 917 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 918 tf->tf_eflags = eflags; 919 tf->tf_vm86_ds = tf->tf_ds; 920 tf->tf_vm86_es = tf->tf_es; 921 tf->tf_vm86_fs = tf->tf_fs; 922 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 923 tf->tf_ds = _udatasel; 924 tf->tf_es = _udatasel; 925 tf->tf_fs = _udatasel; 926 } else { 927 /* 928 * Don't allow users to change privileged or reserved flags. 929 */ 930 /* 931 * XXX do allow users to change the privileged flag PSL_RF. 932 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 933 * should sometimes set it there too. tf_eflags is kept in 934 * the signal context during signal handling and there is no 935 * other place to remember it, so the PSL_RF bit may be 936 * corrupted by the signal handler without us knowing. 937 * Corruption of the PSL_RF bit at worst causes one more or 938 * one less debugger trap, so allowing it is fairly harmless. 939 */ 940 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 941 printf("sigreturn: eflags = 0x%x\n", eflags); 942 return (EINVAL); 943 } 944 945 /* 946 * Don't allow users to load a valid privileged %cs. Let the 947 * hardware check for invalid selectors, excess privilege in 948 * other selectors, invalid %eip's and invalid %esp's. 949 */ 950 cs = ucp->uc_mcontext.mc_cs; 951 if (!CS_SECURE(cs)) { 952 printf("sigreturn: cs = 0x%x\n", cs); 953 trapsignal(p, SIGBUS, T_PROTFLT); 954 return (EINVAL); 955 } 956 957 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 958 } 959 if (ucp->uc_mcontext.mc_onstack & 1) 960 p->p_sigstk.ss_flags |= SS_ONSTACK; 961 else 962 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 963 964 p->p_sigmask = ucp->uc_sigmask; 965 SIG_CANTMASK(p->p_sigmask); 966 return (EJUSTRETURN); 967} 968 969/* 970 * Machine dependent boot() routine 971 * 972 * I haven't seen anything to put here yet 973 * Possibly some stuff might be grafted back here from boot() 974 */ 975void 976cpu_boot(int howto) 977{ 978} 979 980/* 981 * Shutdown the CPU as much as possible 982 */ 983void 984cpu_halt(void) 985{ 986 for (;;) 987 __asm__ ("hlt"); 988} 989 990/* 991 * Clear registers on exec 992 */ 993void 994setregs(p, entry, stack, ps_strings) 995 struct proc *p; 996 u_long entry; 997 u_long stack; 998 u_long ps_strings; 999{ 1000 struct trapframe *regs = p->p_md.md_regs; 1001 struct pcb *pcb = &p->p_addr->u_pcb; 1002 1003#ifdef USER_LDT 1004 /* was i386_user_cleanup() in NetBSD */ 1005 user_ldt_free(pcb); 1006#endif 1007 1008 bzero((char *)regs, sizeof(struct trapframe)); 1009 regs->tf_eip = entry; 1010 regs->tf_esp = stack; 1011 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1012 regs->tf_ss = _udatasel; 1013 regs->tf_ds = _udatasel; 1014 regs->tf_es = _udatasel; 1015 regs->tf_fs = _udatasel; 1016 regs->tf_cs = _ucodesel; 1017 1018 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1019 regs->tf_ebx = ps_strings; 1020 1021 /* reset %gs as well */ 1022 if (pcb == curpcb) 1023 load_gs(_udatasel); 1024 else 1025 pcb->pcb_gs = _udatasel; 1026 1027 /* 1028 * Reset the hardware debug registers if they were in use. 1029 * They won't have any meaning for the newly exec'd process. 1030 */ 1031 if (pcb->pcb_flags & PCB_DBREGS) { 1032 pcb->pcb_dr0 = 0; 1033 pcb->pcb_dr1 = 0; 1034 pcb->pcb_dr2 = 0; 1035 pcb->pcb_dr3 = 0; 1036 pcb->pcb_dr6 = 0; 1037 pcb->pcb_dr7 = 0; 1038 if (pcb == curpcb) { 1039 /* 1040 * Clear the debug registers on the running 1041 * CPU, otherwise they will end up affecting 1042 * the next process we switch to. 1043 */ 1044 reset_dbregs(); 1045 } 1046 pcb->pcb_flags &= ~PCB_DBREGS; 1047 } 1048 1049 /* 1050 * Initialize the math emulator (if any) for the current process. 1051 * Actually, just clear the bit that says that the emulator has 1052 * been initialized. Initialization is delayed until the process 1053 * traps to the emulator (if it is done at all) mainly because 1054 * emulators don't provide an entry point for initialization. 1055 */ 1056 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1057 1058 /* 1059 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1060 * for why fwait must be trapped at least if there is an npx or an 1061 * emulator). This is mainly to handle the case where npx0 is not 1062 * configured, since the npx routines normally set up the trap 1063 * otherwise. It should be done only at boot time, but doing it 1064 * here allows modifying `npx_exists' for testing the emulator on 1065 * systems with an npx. 1066 */ 1067 load_cr0(rcr0() | CR0_MP | CR0_TS); 1068 1069#if NNPX > 0 1070 /* Initialize the npx (if any) for the current process. */ 1071 npxinit(__INITIAL_NPXCW__); 1072#endif 1073 1074 /* 1075 * XXX - Linux emulator 1076 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1077 * on it. 1078 */ 1079 p->p_retval[1] = 0; 1080} 1081 1082static int 1083sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1084{ 1085 int error; 1086 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1087 req); 1088 if (!error && req->newptr) 1089 resettodr(); 1090 return (error); 1091} 1092 1093SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1094 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1095 1096SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1097 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1098 1099SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1100 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1101 1102SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1103 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1104 1105/* 1106 * Initialize 386 and configure to run kernel 1107 */ 1108 1109/* 1110 * Initialize segments & interrupt table 1111 */ 1112 1113int _default_ldt; 1114#ifdef SMP 1115union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1116#else 1117union descriptor gdt[NGDT]; /* global descriptor table */ 1118#endif 1119static struct gate_descriptor idt0[NIDT]; 1120struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1121union descriptor ldt[NLDT]; /* local descriptor table */ 1122#ifdef SMP 1123/* table descriptors - used to load tables by microp */ 1124struct region_descriptor r_gdt, r_idt; 1125#endif 1126 1127#ifndef SMP 1128extern struct segment_descriptor common_tssd, *tss_gdt; 1129#endif 1130int private_tss; /* flag indicating private tss */ 1131 1132#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1133extern int has_f00f_bug; 1134#endif 1135 1136static struct i386tss dblfault_tss; 1137static char dblfault_stack[PAGE_SIZE]; 1138 1139extern struct user *proc0paddr; 1140 1141 1142/* software prototypes -- in more palatable form */ 1143struct soft_segment_descriptor gdt_segs[] = { 1144/* GNULL_SEL 0 Null Descriptor */ 1145{ 0x0, /* segment base address */ 1146 0x0, /* length */ 1147 0, /* segment type */ 1148 0, /* segment descriptor priority level */ 1149 0, /* segment descriptor present */ 1150 0, 0, 1151 0, /* default 32 vs 16 bit size */ 1152 0 /* limit granularity (byte/page units)*/ }, 1153/* GCODE_SEL 1 Code Descriptor for kernel */ 1154{ 0x0, /* segment base address */ 1155 0xfffff, /* length - all address space */ 1156 SDT_MEMERA, /* segment type */ 1157 0, /* segment descriptor priority level */ 1158 1, /* segment descriptor present */ 1159 0, 0, 1160 1, /* default 32 vs 16 bit size */ 1161 1 /* limit granularity (byte/page units)*/ }, 1162/* GDATA_SEL 2 Data Descriptor for kernel */ 1163{ 0x0, /* segment base address */ 1164 0xfffff, /* length - all address space */ 1165 SDT_MEMRWA, /* segment type */ 1166 0, /* segment descriptor priority level */ 1167 1, /* segment descriptor present */ 1168 0, 0, 1169 1, /* default 32 vs 16 bit size */ 1170 1 /* limit granularity (byte/page units)*/ }, 1171/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1172{ 0x0, /* segment base address */ 1173 0xfffff, /* length - all address space */ 1174 SDT_MEMRWA, /* segment type */ 1175 0, /* segment descriptor priority level */ 1176 1, /* segment descriptor present */ 1177 0, 0, 1178 1, /* default 32 vs 16 bit size */ 1179 1 /* limit granularity (byte/page units)*/ }, 1180/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1181{ 1182 0x0, /* segment base address */ 1183 sizeof(struct i386tss)-1,/* length - all address space */ 1184 SDT_SYS386TSS, /* segment type */ 1185 0, /* segment descriptor priority level */ 1186 1, /* segment descriptor present */ 1187 0, 0, 1188 0, /* unused - default 32 vs 16 bit size */ 1189 0 /* limit granularity (byte/page units)*/ }, 1190/* GLDT_SEL 5 LDT Descriptor */ 1191{ (int) ldt, /* segment base address */ 1192 sizeof(ldt)-1, /* length - all address space */ 1193 SDT_SYSLDT, /* segment type */ 1194 SEL_UPL, /* segment descriptor priority level */ 1195 1, /* segment descriptor present */ 1196 0, 0, 1197 0, /* unused - default 32 vs 16 bit size */ 1198 0 /* limit granularity (byte/page units)*/ }, 1199/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1200{ (int) ldt, /* segment base address */ 1201 (512 * sizeof(union descriptor)-1), /* length */ 1202 SDT_SYSLDT, /* segment type */ 1203 0, /* segment descriptor priority level */ 1204 1, /* segment descriptor present */ 1205 0, 0, 1206 0, /* unused - default 32 vs 16 bit size */ 1207 0 /* limit granularity (byte/page units)*/ }, 1208/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1209{ 0x0, /* segment base address */ 1210 0x0, /* length - all address space */ 1211 0, /* segment type */ 1212 0, /* segment descriptor priority level */ 1213 0, /* segment descriptor present */ 1214 0, 0, 1215 0, /* default 32 vs 16 bit size */ 1216 0 /* limit granularity (byte/page units)*/ }, 1217/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1218{ 0x400, /* segment base address */ 1219 0xfffff, /* length */ 1220 SDT_MEMRWA, /* segment type */ 1221 0, /* segment descriptor priority level */ 1222 1, /* segment descriptor present */ 1223 0, 0, 1224 1, /* default 32 vs 16 bit size */ 1225 1 /* limit granularity (byte/page units)*/ }, 1226/* GPANIC_SEL 9 Panic Tss Descriptor */ 1227{ (int) &dblfault_tss, /* segment base address */ 1228 sizeof(struct i386tss)-1,/* length - all address space */ 1229 SDT_SYS386TSS, /* segment type */ 1230 0, /* segment descriptor priority level */ 1231 1, /* segment descriptor present */ 1232 0, 0, 1233 0, /* unused - default 32 vs 16 bit size */ 1234 0 /* limit granularity (byte/page units)*/ }, 1235/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1236{ 0, /* segment base address (overwritten) */ 1237 0xfffff, /* length */ 1238 SDT_MEMERA, /* segment type */ 1239 0, /* segment descriptor priority level */ 1240 1, /* segment descriptor present */ 1241 0, 0, 1242 0, /* default 32 vs 16 bit size */ 1243 1 /* limit granularity (byte/page units)*/ }, 1244/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1245{ 0, /* segment base address (overwritten) */ 1246 0xfffff, /* length */ 1247 SDT_MEMERA, /* segment type */ 1248 0, /* segment descriptor priority level */ 1249 1, /* segment descriptor present */ 1250 0, 0, 1251 0, /* default 32 vs 16 bit size */ 1252 1 /* limit granularity (byte/page units)*/ }, 1253/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1254{ 0, /* segment base address (overwritten) */ 1255 0xfffff, /* length */ 1256 SDT_MEMRWA, /* segment type */ 1257 0, /* segment descriptor priority level */ 1258 1, /* segment descriptor present */ 1259 0, 0, 1260 1, /* default 32 vs 16 bit size */ 1261 1 /* limit granularity (byte/page units)*/ }, 1262/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1263{ 0, /* segment base address (overwritten) */ 1264 0xfffff, /* length */ 1265 SDT_MEMRWA, /* segment type */ 1266 0, /* segment descriptor priority level */ 1267 1, /* segment descriptor present */ 1268 0, 0, 1269 0, /* default 32 vs 16 bit size */ 1270 1 /* limit granularity (byte/page units)*/ }, 1271/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1272{ 0, /* segment base address (overwritten) */ 1273 0xfffff, /* length */ 1274 SDT_MEMRWA, /* segment type */ 1275 0, /* segment descriptor priority level */ 1276 1, /* segment descriptor present */ 1277 0, 0, 1278 0, /* default 32 vs 16 bit size */ 1279 1 /* limit granularity (byte/page units)*/ }, 1280}; 1281 1282static struct soft_segment_descriptor ldt_segs[] = { 1283 /* Null Descriptor - overwritten by call gate */ 1284{ 0x0, /* segment base address */ 1285 0x0, /* length - all address space */ 1286 0, /* segment type */ 1287 0, /* segment descriptor priority level */ 1288 0, /* segment descriptor present */ 1289 0, 0, 1290 0, /* default 32 vs 16 bit size */ 1291 0 /* limit granularity (byte/page units)*/ }, 1292 /* Null Descriptor - overwritten by call gate */ 1293{ 0x0, /* segment base address */ 1294 0x0, /* length - all address space */ 1295 0, /* segment type */ 1296 0, /* segment descriptor priority level */ 1297 0, /* segment descriptor present */ 1298 0, 0, 1299 0, /* default 32 vs 16 bit size */ 1300 0 /* limit granularity (byte/page units)*/ }, 1301 /* Null Descriptor - overwritten by call gate */ 1302{ 0x0, /* segment base address */ 1303 0x0, /* length - all address space */ 1304 0, /* segment type */ 1305 0, /* segment descriptor priority level */ 1306 0, /* segment descriptor present */ 1307 0, 0, 1308 0, /* default 32 vs 16 bit size */ 1309 0 /* limit granularity (byte/page units)*/ }, 1310 /* Code Descriptor for user */ 1311{ 0x0, /* segment base address */ 1312 0xfffff, /* length - all address space */ 1313 SDT_MEMERA, /* segment type */ 1314 SEL_UPL, /* segment descriptor priority level */ 1315 1, /* segment descriptor present */ 1316 0, 0, 1317 1, /* default 32 vs 16 bit size */ 1318 1 /* limit granularity (byte/page units)*/ }, 1319 /* Null Descriptor - overwritten by call gate */ 1320{ 0x0, /* segment base address */ 1321 0x0, /* length - all address space */ 1322 0, /* segment type */ 1323 0, /* segment descriptor priority level */ 1324 0, /* segment descriptor present */ 1325 0, 0, 1326 0, /* default 32 vs 16 bit size */ 1327 0 /* limit granularity (byte/page units)*/ }, 1328 /* Data Descriptor for user */ 1329{ 0x0, /* segment base address */ 1330 0xfffff, /* length - all address space */ 1331 SDT_MEMRWA, /* segment type */ 1332 SEL_UPL, /* segment descriptor priority level */ 1333 1, /* segment descriptor present */ 1334 0, 0, 1335 1, /* default 32 vs 16 bit size */ 1336 1 /* limit granularity (byte/page units)*/ }, 1337}; 1338 1339void 1340setidt(idx, func, typ, dpl, selec) 1341 int idx; 1342 inthand_t *func; 1343 int typ; 1344 int dpl; 1345 int selec; 1346{ 1347 struct gate_descriptor *ip; 1348 1349 ip = idt + idx; 1350 ip->gd_looffset = (int)func; 1351 ip->gd_selector = selec; 1352 ip->gd_stkcpy = 0; 1353 ip->gd_xx = 0; 1354 ip->gd_type = typ; 1355 ip->gd_dpl = dpl; 1356 ip->gd_p = 1; 1357 ip->gd_hioffset = ((int)func)>>16 ; 1358} 1359 1360#define IDTVEC(name) __CONCAT(X,name) 1361 1362extern inthand_t 1363 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1364 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1365 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1366 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1367 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1368 1369void 1370sdtossd(sd, ssd) 1371 struct segment_descriptor *sd; 1372 struct soft_segment_descriptor *ssd; 1373{ 1374 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1375 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1376 ssd->ssd_type = sd->sd_type; 1377 ssd->ssd_dpl = sd->sd_dpl; 1378 ssd->ssd_p = sd->sd_p; 1379 ssd->ssd_def32 = sd->sd_def32; 1380 ssd->ssd_gran = sd->sd_gran; 1381} 1382 1383#define PHYSMAP_SIZE (2 * 8) 1384 1385/* 1386 * Populate the (physmap) array with base/bound pairs describing the 1387 * available physical memory in the system, then test this memory and 1388 * build the phys_avail array describing the actually-available memory. 1389 * 1390 * If we cannot accurately determine the physical memory map, then use 1391 * value from the 0xE801 call, and failing that, the RTC. 1392 * 1393 * Total memory size may be set by the kernel environment variable 1394 * hw.physmem or the compile-time define MAXMEM. 1395 */ 1396static void 1397getmemsize(int first) 1398{ 1399 int i, physmap_idx, pa_indx; 1400 u_int basemem, extmem; 1401 struct vm86frame vmf; 1402 struct vm86context vmc; 1403 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1404 pt_entry_t pte; 1405 const char *cp; 1406 struct { 1407 u_int64_t base; 1408 u_int64_t length; 1409 u_int32_t type; 1410 } *smap; 1411 1412 bzero(&vmf, sizeof(struct vm86frame)); 1413 bzero(physmap, sizeof(physmap)); 1414 1415 /* 1416 * Perform "base memory" related probes & setup 1417 */ 1418 vm86_intcall(0x12, &vmf); 1419 basemem = vmf.vmf_ax; 1420 if (basemem > 640) { 1421 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1422 basemem); 1423 basemem = 640; 1424 } 1425 1426 /* 1427 * XXX if biosbasemem is now < 640, there is a `hole' 1428 * between the end of base memory and the start of 1429 * ISA memory. The hole may be empty or it may 1430 * contain BIOS code or data. Map it read/write so 1431 * that the BIOS can write to it. (Memory from 0 to 1432 * the physical end of the kernel is mapped read-only 1433 * to begin with and then parts of it are remapped. 1434 * The parts that aren't remapped form holes that 1435 * remain read-only and are unused by the kernel. 1436 * The base memory area is below the physical end of 1437 * the kernel and right now forms a read-only hole. 1438 * The part of it from PAGE_SIZE to 1439 * (trunc_page(biosbasemem * 1024) - 1) will be 1440 * remapped and used by the kernel later.) 1441 * 1442 * This code is similar to the code used in 1443 * pmap_mapdev, but since no memory needs to be 1444 * allocated we simply change the mapping. 1445 */ 1446 for (pa = trunc_page(basemem * 1024); 1447 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1448 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1449 *pte = pa | PG_RW | PG_V; 1450 } 1451 1452 /* 1453 * if basemem != 640, map pages r/w into vm86 page table so 1454 * that the bios can scribble on it. 1455 */ 1456 pte = (pt_entry_t)vm86paddr; 1457 for (i = basemem / 4; i < 160; i++) 1458 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1459 1460 /* 1461 * map page 1 R/W into the kernel page table so we can use it 1462 * as a buffer. The kernel will unmap this page later. 1463 */ 1464 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1465 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1466 1467 /* 1468 * get memory map with INT 15:E820 1469 */ 1470#define SMAPSIZ sizeof(*smap) 1471#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1472 1473 vmc.npages = 0; 1474 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1475 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1476 1477 physmap_idx = 0; 1478 vmf.vmf_ebx = 0; 1479 do { 1480 vmf.vmf_eax = 0xE820; 1481 vmf.vmf_edx = SMAP_SIG; 1482 vmf.vmf_ecx = SMAPSIZ; 1483 i = vm86_datacall(0x15, &vmf, &vmc); 1484 if (i || vmf.vmf_eax != SMAP_SIG) 1485 break; 1486 if (boothowto & RB_VERBOSE) 1487 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1488 smap->type, 1489 *(u_int32_t *)((char *)&smap->base + 4), 1490 (u_int32_t)smap->base, 1491 *(u_int32_t *)((char *)&smap->length + 4), 1492 (u_int32_t)smap->length); 1493 1494 if (smap->type != 0x01) 1495 goto next_run; 1496 1497 if (smap->length == 0) 1498 goto next_run; 1499 1500 if (smap->base >= 0xffffffff) { 1501 printf("%uK of memory above 4GB ignored\n", 1502 (u_int)(smap->length / 1024)); 1503 goto next_run; 1504 } 1505 1506 for (i = 0; i <= physmap_idx; i += 2) { 1507 if (smap->base < physmap[i + 1]) { 1508 if (boothowto & RB_VERBOSE) 1509 printf( 1510 "Overlapping or non-montonic memory region, ignoring second region\n"); 1511 goto next_run; 1512 } 1513 } 1514 1515 if (smap->base == physmap[physmap_idx + 1]) { 1516 physmap[physmap_idx + 1] += smap->length; 1517 goto next_run; 1518 } 1519 1520 physmap_idx += 2; 1521 if (physmap_idx == PHYSMAP_SIZE) { 1522 printf( 1523 "Too many segments in the physical address map, giving up\n"); 1524 break; 1525 } 1526 physmap[physmap_idx] = smap->base; 1527 physmap[physmap_idx + 1] = smap->base + smap->length; 1528next_run: 1529 } while (vmf.vmf_ebx != 0); 1530 1531 if (physmap[1] != 0) 1532 goto physmap_done; 1533 1534 /* 1535 * If we failed above, try memory map with INT 15:E801 1536 */ 1537 vmf.vmf_ax = 0xE801; 1538 if (vm86_intcall(0x15, &vmf) == 0) { 1539 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1540 } else { 1541#if 0 1542 vmf.vmf_ah = 0x88; 1543 vm86_intcall(0x15, &vmf); 1544 extmem = vmf.vmf_ax; 1545#else 1546 /* 1547 * Prefer the RTC value for extended memory. 1548 */ 1549 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1550#endif 1551 } 1552 1553 /* 1554 * Special hack for chipsets that still remap the 384k hole when 1555 * there's 16MB of memory - this really confuses people that 1556 * are trying to use bus mastering ISA controllers with the 1557 * "16MB limit"; they only have 16MB, but the remapping puts 1558 * them beyond the limit. 1559 * 1560 * If extended memory is between 15-16MB (16-17MB phys address range), 1561 * chop it to 15MB. 1562 */ 1563 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1564 extmem = 15 * 1024; 1565 1566 physmap[0] = 0; 1567 physmap[1] = basemem * 1024; 1568 physmap_idx = 2; 1569 physmap[physmap_idx] = 0x100000; 1570 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1571 1572physmap_done: 1573 /* 1574 * Now, physmap contains a map of physical memory. 1575 */ 1576 1577#ifdef SMP 1578 /* make hole for AP bootstrap code */ 1579 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1580 1581 /* look for the MP hardware - needed for apic addresses */ 1582 mp_probe(); 1583#endif 1584 1585 /* 1586 * Maxmem isn't the "maximum memory", it's one larger than the 1587 * highest page of the physical address space. It should be 1588 * called something like "Maxphyspage". We may adjust this 1589 * based on ``hw.physmem'' and the results of the memory test. 1590 */ 1591 Maxmem = atop(physmap[physmap_idx + 1]); 1592 1593#ifdef MAXMEM 1594 Maxmem = MAXMEM / 4; 1595#endif 1596 1597 /* 1598 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1599 * for the appropriate modifiers. This overrides MAXMEM. 1600 */ 1601 if ((cp = getenv("hw.physmem")) != NULL) { 1602 u_int64_t AllowMem, sanity; 1603 char *ep; 1604 1605 sanity = AllowMem = strtouq(cp, &ep, 0); 1606 if ((ep != cp) && (*ep != 0)) { 1607 switch(*ep) { 1608 case 'g': 1609 case 'G': 1610 AllowMem <<= 10; 1611 case 'm': 1612 case 'M': 1613 AllowMem <<= 10; 1614 case 'k': 1615 case 'K': 1616 AllowMem <<= 10; 1617 break; 1618 default: 1619 AllowMem = sanity = 0; 1620 } 1621 if (AllowMem < sanity) 1622 AllowMem = 0; 1623 } 1624 if (AllowMem == 0) 1625 printf("Ignoring invalid memory size of '%s'\n", cp); 1626 else 1627 Maxmem = atop(AllowMem); 1628 } 1629 1630 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1631 (boothowto & RB_VERBOSE)) 1632 printf("Physical memory use set to %uK\n", Maxmem * 4); 1633 1634 /* 1635 * If Maxmem has been increased beyond what the system has detected, 1636 * extend the last memory segment to the new limit. 1637 */ 1638 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1639 physmap[physmap_idx + 1] = ptoa(Maxmem); 1640 1641 /* call pmap initialization to make new kernel address space */ 1642 pmap_bootstrap(first, 0); 1643 1644 /* 1645 * Size up each available chunk of physical memory. 1646 */ 1647 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1648 pa_indx = 0; 1649 phys_avail[pa_indx++] = physmap[0]; 1650 phys_avail[pa_indx] = physmap[0]; 1651#if 0 1652 pte = (pt_entry_t)vtopte(KERNBASE); 1653#else 1654 pte = (pt_entry_t)CMAP1; 1655#endif 1656 1657 /* 1658 * physmap is in bytes, so when converting to page boundaries, 1659 * round up the start address and round down the end address. 1660 */ 1661 for (i = 0; i <= physmap_idx; i += 2) { 1662 vm_offset_t end; 1663 1664 end = ptoa(Maxmem); 1665 if (physmap[i + 1] < end) 1666 end = trunc_page(physmap[i + 1]); 1667 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1668 int tmp, page_bad; 1669#if 0 1670 int *ptr = 0; 1671#else 1672 int *ptr = (int *)CADDR1; 1673#endif 1674 1675 /* 1676 * block out kernel memory as not available. 1677 */ 1678 if (pa >= 0x100000 && pa < first) 1679 continue; 1680 1681 page_bad = FALSE; 1682 1683 /* 1684 * map page into kernel: valid, read/write,non-cacheable 1685 */ 1686 *pte = pa | PG_V | PG_RW | PG_N; 1687 invltlb(); 1688 1689 tmp = *(int *)ptr; 1690 /* 1691 * Test for alternating 1's and 0's 1692 */ 1693 *(volatile int *)ptr = 0xaaaaaaaa; 1694 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1695 page_bad = TRUE; 1696 } 1697 /* 1698 * Test for alternating 0's and 1's 1699 */ 1700 *(volatile int *)ptr = 0x55555555; 1701 if (*(volatile int *)ptr != 0x55555555) { 1702 page_bad = TRUE; 1703 } 1704 /* 1705 * Test for all 1's 1706 */ 1707 *(volatile int *)ptr = 0xffffffff; 1708 if (*(volatile int *)ptr != 0xffffffff) { 1709 page_bad = TRUE; 1710 } 1711 /* 1712 * Test for all 0's 1713 */ 1714 *(volatile int *)ptr = 0x0; 1715 if (*(volatile int *)ptr != 0x0) { 1716 page_bad = TRUE; 1717 } 1718 /* 1719 * Restore original value. 1720 */ 1721 *(int *)ptr = tmp; 1722 1723 /* 1724 * Adjust array of valid/good pages. 1725 */ 1726 if (page_bad == TRUE) { 1727 continue; 1728 } 1729 /* 1730 * If this good page is a continuation of the 1731 * previous set of good pages, then just increase 1732 * the end pointer. Otherwise start a new chunk. 1733 * Note that "end" points one higher than end, 1734 * making the range >= start and < end. 1735 * If we're also doing a speculative memory 1736 * test and we at or past the end, bump up Maxmem 1737 * so that we keep going. The first bad page 1738 * will terminate the loop. 1739 */ 1740 if (phys_avail[pa_indx] == pa) { 1741 phys_avail[pa_indx] += PAGE_SIZE; 1742 } else { 1743 pa_indx++; 1744 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1745 printf("Too many holes in the physical address space, giving up\n"); 1746 pa_indx--; 1747 break; 1748 } 1749 phys_avail[pa_indx++] = pa; /* start */ 1750 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1751 } 1752 physmem++; 1753 } 1754 } 1755 *pte = 0; 1756 invltlb(); 1757 1758 /* 1759 * XXX 1760 * The last chunk must contain at least one page plus the message 1761 * buffer to avoid complicating other code (message buffer address 1762 * calculation, etc.). 1763 */ 1764 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1765 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1766 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1767 phys_avail[pa_indx--] = 0; 1768 phys_avail[pa_indx--] = 0; 1769 } 1770 1771 Maxmem = atop(phys_avail[pa_indx]); 1772 1773 /* Trim off space for the message buffer. */ 1774 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1775 1776 avail_end = phys_avail[pa_indx]; 1777} 1778 1779void 1780init386(first) 1781 int first; 1782{ 1783 int x; 1784 struct gate_descriptor *gdp; 1785 int gsel_tss; 1786#ifndef SMP 1787 /* table descriptors - used to load tables by microp */ 1788 struct region_descriptor r_gdt, r_idt; 1789#endif 1790 int off; 1791 1792 /* 1793 * Prevent lowering of the ipl if we call tsleep() early. 1794 */ 1795 safepri = cpl; 1796 1797 proc0.p_addr = proc0paddr; 1798 1799 atdevbase = ISA_HOLE_START + KERNBASE; 1800 1801 if (bootinfo.bi_modulep) { 1802 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1803 preload_bootstrap_relocate(KERNBASE); 1804 } 1805 if (bootinfo.bi_envp) 1806 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1807 1808 /* 1809 * make gdt memory segments, the code segment goes up to end of the 1810 * page with etext in it, the data segment goes to the end of 1811 * the address space 1812 */ 1813 /* 1814 * XXX text protection is temporarily (?) disabled. The limit was 1815 * i386_btop(round_page(etext)) - 1. 1816 */ 1817 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1818 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1819#ifdef SMP 1820 gdt_segs[GPRIV_SEL].ssd_limit = 1821 i386_btop(sizeof(struct privatespace)) - 1; 1822 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1823 gdt_segs[GPROC0_SEL].ssd_base = 1824 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1825 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1826#else 1827 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1828 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1829#endif 1830 1831 for (x = 0; x < NGDT; x++) { 1832#ifdef BDE_DEBUGGER 1833 /* avoid overwriting db entries with APM ones */ 1834 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1835 continue; 1836#endif 1837 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1838 } 1839 1840 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1841 r_gdt.rd_base = (int) gdt; 1842 lgdt(&r_gdt); 1843 1844 /* make ldt memory segments */ 1845 /* 1846 * The data segment limit must not cover the user area because we 1847 * don't want the user area to be writable in copyout() etc. (page 1848 * level protection is lost in kernel mode on 386's). Also, we 1849 * don't want the user area to be writable directly (page level 1850 * protection of the user area is not available on 486's with 1851 * CR0_WP set, because there is no user-read/kernel-write mode). 1852 * 1853 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1854 * should be spelled ...MAX_USER... 1855 */ 1856#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1857 /* 1858 * The code segment limit has to cover the user area until we move 1859 * the signal trampoline out of the user area. This is safe because 1860 * the code segment cannot be written to directly. 1861 */ 1862#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1863 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1864 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1865 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1866 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1867 1868 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1869 lldt(_default_ldt); 1870#ifdef USER_LDT 1871 currentldt = _default_ldt; 1872#endif 1873 1874 /* exceptions */ 1875 for (x = 0; x < NIDT; x++) 1876 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1877 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1879 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1880 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1881 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1882 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1883 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1884 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1885 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1886 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1887 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1888 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1889 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1890 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1891 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1892 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1893 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1894 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1895 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1896 setidt(0x80, &IDTVEC(int0x80_syscall), 1897 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1898 1899 r_idt.rd_limit = sizeof(idt0) - 1; 1900 r_idt.rd_base = (int) idt; 1901 lidt(&r_idt); 1902 1903 /* 1904 * Initialize the console before we print anything out. 1905 */ 1906 cninit(); 1907 1908#include "isa.h" 1909#if NISA >0 1910 isa_defaultirq(); 1911#endif 1912 rand_initialize(); 1913 1914#ifdef DDB 1915 kdb_init(); 1916 if (boothowto & RB_KDB) 1917 Debugger("Boot flags requested debugger"); 1918#endif 1919 1920 finishidentcpu(); /* Final stage of CPU initialization */ 1921 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1922 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1923 initializecpu(); /* Initialize CPU registers */ 1924 1925 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1926 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1927 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1928 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1929 private_tss = 0; 1930 tss_gdt = &gdt[GPROC0_SEL].sd; 1931 common_tssd = *tss_gdt; 1932 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1933 ltr(gsel_tss); 1934 1935 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1936 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1937 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1938 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1939 dblfault_tss.tss_cr3 = (int)IdlePTD; 1940 dblfault_tss.tss_eip = (int) dblfault_handler; 1941 dblfault_tss.tss_eflags = PSL_KERNEL; 1942 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1943 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1944 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1945 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1946 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1947 1948 vm86_initialize(); 1949 getmemsize(first); 1950 1951 /* now running on new page tables, configured,and u/iom is accessible */ 1952 1953 /* Map the message buffer. */ 1954 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1955 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1956 1957 msgbufinit(msgbufp, MSGBUF_SIZE); 1958 1959 /* make a call gate to reenter kernel with */ 1960 gdp = &ldt[LSYS5CALLS_SEL].gd; 1961 1962 x = (int) &IDTVEC(syscall); 1963 gdp->gd_looffset = x++; 1964 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1965 gdp->gd_stkcpy = 1; 1966 gdp->gd_type = SDT_SYS386CGT; 1967 gdp->gd_dpl = SEL_UPL; 1968 gdp->gd_p = 1; 1969 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1970 1971 /* XXX does this work? */ 1972 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1973 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1974 1975 /* transfer to user mode */ 1976 1977 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1978 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1979 1980 /* setup proc 0's pcb */ 1981 proc0.p_addr->u_pcb.pcb_flags = 0; 1982 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1983#ifdef SMP 1984 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1985#endif 1986 proc0.p_addr->u_pcb.pcb_ext = 0; 1987} 1988 1989#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1990static void f00f_hack(void *unused); 1991SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1992 1993static void 1994f00f_hack(void *unused) { 1995 struct gate_descriptor *new_idt; 1996#ifndef SMP 1997 struct region_descriptor r_idt; 1998#endif 1999 vm_offset_t tmp; 2000 2001 if (!has_f00f_bug) 2002 return; 2003 2004 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2005 2006 r_idt.rd_limit = sizeof(idt0) - 1; 2007 2008 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2009 if (tmp == 0) 2010 panic("kmem_alloc returned 0"); 2011 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2012 panic("kmem_alloc returned non-page-aligned memory"); 2013 /* Put the first seven entries in the lower page */ 2014 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2015 bcopy(idt, new_idt, sizeof(idt0)); 2016 r_idt.rd_base = (int)new_idt; 2017 lidt(&r_idt); 2018 idt = new_idt; 2019 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2020 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2021 panic("vm_map_protect failed"); 2022 return; 2023} 2024#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2025 2026int 2027ptrace_set_pc(p, addr) 2028 struct proc *p; 2029 unsigned long addr; 2030{ 2031 p->p_md.md_regs->tf_eip = addr; 2032 return (0); 2033} 2034 2035int 2036ptrace_single_step(p) 2037 struct proc *p; 2038{ 2039 p->p_md.md_regs->tf_eflags |= PSL_T; 2040 return (0); 2041} 2042 2043int ptrace_read_u_check(p, addr, len) 2044 struct proc *p; 2045 vm_offset_t addr; 2046 size_t len; 2047{ 2048 vm_offset_t gap; 2049 2050 if ((vm_offset_t) (addr + len) < addr) 2051 return EPERM; 2052 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2053 return 0; 2054 2055 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2056 2057 if ((vm_offset_t) addr < gap) 2058 return EPERM; 2059 if ((vm_offset_t) (addr + len) <= 2060 (vm_offset_t) (gap + sizeof(struct trapframe))) 2061 return 0; 2062 return EPERM; 2063} 2064 2065int ptrace_write_u(p, off, data) 2066 struct proc *p; 2067 vm_offset_t off; 2068 long data; 2069{ 2070 struct trapframe frame_copy; 2071 vm_offset_t min; 2072 struct trapframe *tp; 2073 2074 /* 2075 * Privileged kernel state is scattered all over the user area. 2076 * Only allow write access to parts of regs and to fpregs. 2077 */ 2078 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2079 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2080 tp = p->p_md.md_regs; 2081 frame_copy = *tp; 2082 *(int *)((char *)&frame_copy + (off - min)) = data; 2083 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2084 !CS_SECURE(frame_copy.tf_cs)) 2085 return (EINVAL); 2086 *(int*)((char *)p->p_addr + off) = data; 2087 return (0); 2088 } 2089 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2090 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2091 *(int*)((char *)p->p_addr + off) = data; 2092 return (0); 2093 } 2094 return (EFAULT); 2095} 2096 2097int 2098fill_regs(p, regs) 2099 struct proc *p; 2100 struct reg *regs; 2101{ 2102 struct pcb *pcb; 2103 struct trapframe *tp; 2104 2105 tp = p->p_md.md_regs; 2106 regs->r_fs = tp->tf_fs; 2107 regs->r_es = tp->tf_es; 2108 regs->r_ds = tp->tf_ds; 2109 regs->r_edi = tp->tf_edi; 2110 regs->r_esi = tp->tf_esi; 2111 regs->r_ebp = tp->tf_ebp; 2112 regs->r_ebx = tp->tf_ebx; 2113 regs->r_edx = tp->tf_edx; 2114 regs->r_ecx = tp->tf_ecx; 2115 regs->r_eax = tp->tf_eax; 2116 regs->r_eip = tp->tf_eip; 2117 regs->r_cs = tp->tf_cs; 2118 regs->r_eflags = tp->tf_eflags; 2119 regs->r_esp = tp->tf_esp; 2120 regs->r_ss = tp->tf_ss; 2121 pcb = &p->p_addr->u_pcb; 2122 regs->r_gs = pcb->pcb_gs; 2123 return (0); 2124} 2125 2126int 2127set_regs(p, regs) 2128 struct proc *p; 2129 struct reg *regs; 2130{ 2131 struct pcb *pcb; 2132 struct trapframe *tp; 2133 2134 tp = p->p_md.md_regs; 2135 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2136 !CS_SECURE(regs->r_cs)) 2137 return (EINVAL); 2138 tp->tf_fs = regs->r_fs; 2139 tp->tf_es = regs->r_es; 2140 tp->tf_ds = regs->r_ds; 2141 tp->tf_edi = regs->r_edi; 2142 tp->tf_esi = regs->r_esi; 2143 tp->tf_ebp = regs->r_ebp; 2144 tp->tf_ebx = regs->r_ebx; 2145 tp->tf_edx = regs->r_edx; 2146 tp->tf_ecx = regs->r_ecx; 2147 tp->tf_eax = regs->r_eax; 2148 tp->tf_eip = regs->r_eip; 2149 tp->tf_cs = regs->r_cs; 2150 tp->tf_eflags = regs->r_eflags; 2151 tp->tf_esp = regs->r_esp; 2152 tp->tf_ss = regs->r_ss; 2153 pcb = &p->p_addr->u_pcb; 2154 pcb->pcb_gs = regs->r_gs; 2155 return (0); 2156} 2157 2158int 2159fill_fpregs(p, fpregs) 2160 struct proc *p; 2161 struct fpreg *fpregs; 2162{ 2163 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2164 return (0); 2165} 2166 2167int 2168set_fpregs(p, fpregs) 2169 struct proc *p; 2170 struct fpreg *fpregs; 2171{ 2172 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2173 return (0); 2174} 2175 2176int 2177fill_dbregs(p, dbregs) 2178 struct proc *p; 2179 struct dbreg *dbregs; 2180{ 2181 struct pcb *pcb; 2182 2183 pcb = &p->p_addr->u_pcb; 2184 dbregs->dr0 = pcb->pcb_dr0; 2185 dbregs->dr1 = pcb->pcb_dr1; 2186 dbregs->dr2 = pcb->pcb_dr2; 2187 dbregs->dr3 = pcb->pcb_dr3; 2188 dbregs->dr4 = 0; 2189 dbregs->dr5 = 0; 2190 dbregs->dr6 = pcb->pcb_dr6; 2191 dbregs->dr7 = pcb->pcb_dr7; 2192 return (0); 2193} 2194 2195int 2196set_dbregs(p, dbregs) 2197 struct proc *p; 2198 struct dbreg *dbregs; 2199{ 2200 struct pcb *pcb; 2201 2202 pcb = &p->p_addr->u_pcb; 2203 2204 /* 2205 * Don't let a process set a breakpoint that is not within the 2206 * process's address space. If a process could do this, it 2207 * could halt the system by setting a breakpoint in the kernel 2208 * (if ddb was enabled). Thus, we need to check to make sure 2209 * that no breakpoints are being enabled for addresses outside 2210 * process's address space, unless, perhaps, we were called by 2211 * uid 0. 2212 * 2213 * XXX - what about when the watched area of the user's 2214 * address space is written into from within the kernel 2215 * ... wouldn't that still cause a breakpoint to be generated 2216 * from within kernel mode? 2217 */ 2218 2219 if (p->p_ucred->cr_uid != 0) { 2220 if (dbregs->dr7 & 0x3) { 2221 /* dr0 is enabled */ 2222 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2223 return (EINVAL); 2224 } 2225 2226 if (dbregs->dr7 & (0x3<<2)) { 2227 /* dr1 is enabled */ 2228 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2229 return (EINVAL); 2230 } 2231 2232 if (dbregs->dr7 & (0x3<<4)) { 2233 /* dr2 is enabled */ 2234 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2235 return (EINVAL); 2236 } 2237 2238 if (dbregs->dr7 & (0x3<<6)) { 2239 /* dr3 is enabled */ 2240 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2241 return (EINVAL); 2242 } 2243 } 2244 2245 pcb->pcb_dr0 = dbregs->dr0; 2246 pcb->pcb_dr1 = dbregs->dr1; 2247 pcb->pcb_dr2 = dbregs->dr2; 2248 pcb->pcb_dr3 = dbregs->dr3; 2249 pcb->pcb_dr6 = dbregs->dr6; 2250 pcb->pcb_dr7 = dbregs->dr7; 2251 2252 pcb->pcb_flags |= PCB_DBREGS; 2253 2254 return (0); 2255} 2256 2257/* 2258 * Return > 0 if a hardware breakpoint has been hit, and the 2259 * breakpoint was in user space. Return 0, otherwise. 2260 */ 2261int 2262user_dbreg_trap(void) 2263{ 2264 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2265 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2266 int nbp; /* number of breakpoints that triggered */ 2267 caddr_t addr[4]; /* breakpoint addresses */ 2268 int i; 2269 2270 dr7 = rdr7(); 2271 if ((dr7 & 0x000000ff) == 0) { 2272 /* 2273 * all GE and LE bits in the dr7 register are zero, 2274 * thus the trap couldn't have been caused by the 2275 * hardware debug registers 2276 */ 2277 return 0; 2278 } 2279 2280 nbp = 0; 2281 dr6 = rdr6(); 2282 bp = dr6 & 0x0000000f; 2283 2284 if (!bp) { 2285 /* 2286 * None of the breakpoint bits are set meaning this 2287 * trap was not caused by any of the debug registers 2288 */ 2289 return 0; 2290 } 2291 2292 /* 2293 * at least one of the breakpoints were hit, check to see 2294 * which ones and if any of them are user space addresses 2295 */ 2296 2297 if (bp & 0x01) { 2298 addr[nbp++] = (caddr_t)rdr0(); 2299 } 2300 if (bp & 0x02) { 2301 addr[nbp++] = (caddr_t)rdr1(); 2302 } 2303 if (bp & 0x04) { 2304 addr[nbp++] = (caddr_t)rdr2(); 2305 } 2306 if (bp & 0x08) { 2307 addr[nbp++] = (caddr_t)rdr3(); 2308 } 2309 2310 for (i=0; i<nbp; i++) { 2311 if (addr[i] < 2312 (caddr_t)VM_MAXUSER_ADDRESS) { 2313 /* 2314 * addr[i] is in user space 2315 */ 2316 return nbp; 2317 } 2318 } 2319 2320 /* 2321 * None of the breakpoints are in user space. 2322 */ 2323 return 0; 2324} 2325 2326 2327#ifndef DDB 2328void 2329Debugger(const char *msg) 2330{ 2331 printf("Debugger(\"%s\") called.\n", msg); 2332} 2333#endif /* no DDB */ 2334 2335#include <sys/disklabel.h> 2336 2337/* 2338 * Determine the size of the transfer, and make sure it is 2339 * within the boundaries of the partition. Adjust transfer 2340 * if needed, and signal errors or early completion. 2341 */ 2342int 2343bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2344{ 2345 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2346 int labelsect = lp->d_partitions[0].p_offset; 2347 int maxsz = p->p_size, 2348 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2349 2350 /* overwriting disk label ? */ 2351 /* XXX should also protect bootstrap in first 8K */ 2352 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2353#if LABELSECTOR != 0 2354 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2355#endif 2356 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2357 bp->bio_error = EROFS; 2358 goto bad; 2359 } 2360 2361#if defined(DOSBBSECTOR) && defined(notyet) 2362 /* overwriting master boot record? */ 2363 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2364 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2365 bp->bio_error = EROFS; 2366 goto bad; 2367 } 2368#endif 2369 2370 /* beyond partition? */ 2371 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2372 /* if exactly at end of disk, return an EOF */ 2373 if (bp->bio_blkno == maxsz) { 2374 bp->bio_resid = bp->bio_bcount; 2375 return(0); 2376 } 2377 /* or truncate if part of it fits */ 2378 sz = maxsz - bp->bio_blkno; 2379 if (sz <= 0) { 2380 bp->bio_error = EINVAL; 2381 goto bad; 2382 } 2383 bp->bio_bcount = sz << DEV_BSHIFT; 2384 } 2385 2386 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2387 return(1); 2388 2389bad: 2390 bp->bio_flags |= BIO_ERROR; 2391 return(-1); 2392} 2393 2394#ifdef DDB 2395 2396/* 2397 * Provide inb() and outb() as functions. They are normally only 2398 * available as macros calling inlined functions, thus cannot be 2399 * called inside DDB. 2400 * 2401 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2402 */ 2403 2404#undef inb 2405#undef outb 2406 2407/* silence compiler warnings */ 2408u_char inb(u_int); 2409void outb(u_int, u_char); 2410 2411u_char 2412inb(u_int port) 2413{ 2414 u_char data; 2415 /* 2416 * We use %%dx and not %1 here because i/o is done at %dx and not at 2417 * %edx, while gcc generates inferior code (movw instead of movl) 2418 * if we tell it to load (u_short) port. 2419 */ 2420 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2421 return (data); 2422} 2423 2424void 2425outb(u_int port, u_char data) 2426{ 2427 u_char al; 2428 /* 2429 * Use an unnecessary assignment to help gcc's register allocator. 2430 * This make a large difference for gcc-1.40 and a tiny difference 2431 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2432 * best results. gcc-2.6.0 can't handle this. 2433 */ 2434 al = data; 2435 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2436} 2437 2438#endif /* DDB */ 2439