machdep.c revision 15565
1227825Stheraven/*- 2227825Stheraven * Copyright (c) 1992 Terrence R. Lambert. 3227825Stheraven * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4227825Stheraven * All rights reserved. 5227825Stheraven * 6227825Stheraven * This code is derived from software contributed to Berkeley by 7227825Stheraven * William Jolitz. 8227825Stheraven * 9227825Stheraven * Redistribution and use in source and binary forms, with or without 10262801Sdim * modification, are permitted provided that the following conditions 11227825Stheraven * are met: 12227825Stheraven * 1. Redistributions of source code must retain the above copyright 13227825Stheraven * notice, this list of conditions and the following disclaimer. 14227825Stheraven * 2. Redistributions in binary form must reproduce the above copyright 15227825Stheraven * notice, this list of conditions and the following disclaimer in the 16227825Stheraven * documentation and/or other materials provided with the distribution. 17227825Stheraven * 3. All advertising materials mentioning features or use of this software 18227825Stheraven * must display the following acknowledgement: 19227825Stheraven * This product includes software developed by the University of 20249998Sdim * California, Berkeley and its contributors. 21227825Stheraven * 4. Neither the name of the University nor the names of its contributors 22227825Stheraven * may be used to endorse or promote products derived from this software 23227825Stheraven * without specific prior written permission. 24227825Stheraven * 25227825Stheraven * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26246487Stheraven * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27227825Stheraven * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28249998Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29227825Stheraven * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30227825Stheraven * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31227825Stheraven * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32227825Stheraven * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33227825Stheraven * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34227825Stheraven * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35227825Stheraven * SUCH DAMAGE. 36227825Stheraven * 37227825Stheraven * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 38227825Stheraven * $Id: machdep.c,v 1.187 1996/05/02 14:19:47 phk Exp $ 39227825Stheraven */ 40227825Stheraven 41227825Stheraven#include "npx.h" 42227825Stheraven#include "isa.h" 43227825Stheraven#include "opt_sysvipc.h" 44227825Stheraven#include "opt_ddb.h" 45227825Stheraven#include "opt_bounce.h" 46227825Stheraven#include "opt_machdep.h" 47227825Stheraven#include "opt_perfmon.h" 48227825Stheraven 49227825Stheraven#include <sys/param.h> 50227825Stheraven#include <sys/systm.h> 51227825Stheraven#include <sys/sysproto.h> 52227825Stheraven#include <sys/signalvar.h> 53227825Stheraven#include <sys/kernel.h> 54227825Stheraven#include <sys/proc.h> 55227825Stheraven#include <sys/buf.h> 56227825Stheraven#include <sys/reboot.h> 57227825Stheraven#include <sys/conf.h> 58227825Stheraven#include <sys/file.h> 59227825Stheraven#include <sys/callout.h> 60227825Stheraven#include <sys/malloc.h> 61227825Stheraven#include <sys/mbuf.h> 62227825Stheraven#include <sys/mount.h> 63227825Stheraven#include <sys/msgbuf.h> 64227825Stheraven#include <sys/ioctl.h> 65227825Stheraven#include <sys/sysent.h> 66227825Stheraven#include <sys/tty.h> 67227825Stheraven#include <sys/sysctl.h> 68227825Stheraven#include <sys/devconf.h> 69227825Stheraven#include <sys/vmmeter.h> 70227825Stheraven 71227825Stheraven#ifdef SYSVSHM 72227825Stheraven#include <sys/shm.h> 73227825Stheraven#endif 74227825Stheraven 75227825Stheraven#ifdef SYSVMSG 76227825Stheraven#include <sys/msg.h> 77227825Stheraven#endif 78227825Stheraven 79227825Stheraven#ifdef SYSVSEM 80227825Stheraven#include <sys/sem.h> 81227825Stheraven#endif 82227825Stheraven 83227825Stheraven#include <vm/vm.h> 84227825Stheraven#include <vm/vm_param.h> 85227825Stheraven#include <vm/vm_prot.h> 86227825Stheraven#include <vm/lock.h> 87227825Stheraven#include <vm/vm_kern.h> 88227825Stheraven#include <vm/vm_object.h> 89227825Stheraven#include <vm/vm_page.h> 90227825Stheraven#include <vm/vm_map.h> 91227825Stheraven#include <vm/vm_pager.h> 92227825Stheraven#include <vm/vm_extern.h> 93227825Stheraven 94227825Stheraven#include <sys/user.h> 95227825Stheraven#include <sys/exec.h> 96227825Stheraven#include <sys/vnode.h> 97227825Stheraven 98227825Stheraven#include <ddb/ddb.h> 99227825Stheraven 100227825Stheraven#include <net/netisr.h> 101227825Stheraven 102227825Stheraven#include <machine/cpu.h> 103227825Stheraven#include <machine/npx.h> 104227825Stheraven#include <machine/reg.h> 105227825Stheraven#include <machine/psl.h> 106227825Stheraven#include <machine/clock.h> 107227825Stheraven#include <machine/specialreg.h> 108227825Stheraven#include <machine/sysarch.h> 109227825Stheraven#include <machine/cons.h> 110227825Stheraven#include <machine/devconf.h> 111227825Stheraven#include <machine/bootinfo.h> 112227825Stheraven#include <machine/md_var.h> 113249998Sdim#ifdef PERFMON 114227825Stheraven#include <machine/perfmon.h> 115227825Stheraven#endif 116227825Stheraven 117227825Stheraven#include <i386/isa/isa.h> 118227825Stheraven#include <i386/isa/isa_device.h> 119227825Stheraven#include <i386/isa/rtc.h> 120227825Stheraven#include <machine/random.h> 121262801Sdim 122262801Sdimextern void init386 __P((int first)); 123232950Stheravenextern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 124227825Stheravenextern int ptrace_single_step __P((struct proc *p)); 125262801Sdimextern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 126262801Sdimextern void dblfault_handler __P((void)); 127227825Stheraven 128227825Stheravenextern void i486_bzero __P((void *, size_t)); 129227825Stheravenextern void i586_bzero __P((void *, size_t)); 130262801Sdimextern void i686_bzero __P((void *, size_t)); 131262801Sdim 132227825Stheravenstatic void cpu_startup __P((void *)); 133262801SdimSYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 134227825Stheraven 135227825Stheravenstatic void identifycpu(void); 136227825Stheraven 137227825Stheravenchar machine[] = "i386"; 138227825StheravenSYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 139227825Stheraven 140227825Stheravenstatic char cpu_model[128]; 141227825StheravenSYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, cpu_model, 0, ""); 142232950Stheraven 143227825Stheravenstruct kern_devconf kdc_cpu0 = { 144232950Stheraven 0, 0, 0, /* filled in by dev_attach */ 145253159Stheraven "cpu", 0, { MDDT_CPU }, 146227825Stheraven 0, 0, 0, CPU_EXTERNALLEN, 147241903Sdim 0, /* CPU has no parent */ 148227825Stheraven 0, /* no parentdata */ 149241903Sdim DC_BUSY, /* the CPU is always busy */ 150241903Sdim cpu_model, /* no sense in duplication */ 151241903Sdim DC_CLS_CPU /* class */ 152227825Stheraven}; 153227825Stheraven 154227825Stheraven#ifndef PANIC_REBOOT_WAIT_TIME 155227825Stheraven#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 156227825Stheraven#endif 157227825Stheraven 158227825Stheraven#ifdef BOUNCE_BUFFERS 159227825Stheravenextern char *bouncememory; 160227825Stheravenextern int maxbkva; 161227825Stheraven#ifdef BOUNCEPAGES 162227825Stheravenint bouncepages = BOUNCEPAGES; 163227825Stheraven#else 164227825Stheravenint bouncepages = 0; 165227825Stheraven#endif 166227825Stheraven#endif /* BOUNCE_BUFFERS */ 167227825Stheraven 168232950Stheravenextern int freebufspace; 169227825Stheravenint msgbufmapped = 0; /* set when safe to use msgbuf */ 170253159Stheravenint _udatasel, _ucodesel; 171253159Stheravenu_int atdevbase; 172227825Stheraven 173241903Sdim 174227825Stheravenint physmem = 0; 175241903Sdimint cold = 1; 176241903Sdim 177241903Sdimstatic int 178227825Stheravensysctl_hw_physmem SYSCTL_HANDLER_ARGS 179227825Stheraven{ 180227825Stheraven int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 181227825Stheraven return (error); 182227825Stheraven} 183227825Stheraven 184227825StheravenSYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 185227825Stheraven 0, 0, sysctl_hw_physmem, "I", ""); 186227825Stheraven 187227825Stheravenstatic int 188227825Stheravensysctl_hw_usermem SYSCTL_HANDLER_ARGS 189227825Stheraven{ 190232950Stheraven int error = sysctl_handle_int(oidp, 0, 191227825Stheraven ctob(physmem - cnt.v_wire_count), req); 192227825Stheraven return (error); 193227825Stheraven} 194227825Stheraven 195227825StheravenSYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 196227825Stheraven 0, 0, sysctl_hw_usermem, "I", ""); 197227825Stheraven 198227825Stheravenint boothowto = 0, bootverbose = 0, Maxmem = 0; 199227825Stheravenstatic int badpages = 0; 200227825Stheravenlong dumplo; 201227825Stheravenextern int bootdev; 202227825Stheraven 203227825Stheravenvm_offset_t phys_avail[10]; 204227825Stheraven 205227825Stheraven/* must be 2 less so 0 0 can signal end of chunks */ 206227825Stheraven#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 207227825Stheraven 208227825Stheravenint cpu_class = CPUCLASS_386; /* smallest common denominator */ 209227825Stheraven 210227825Stheravenstatic void dumpsys __P((void)); 211227825Stheravenstatic void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 212227825Stheraven 213227825Stheravenstatic vm_offset_t buffer_sva, buffer_eva; 214227825Stheravenvm_offset_t clean_sva, clean_eva; 215227825Stheravenstatic vm_offset_t pager_sva, pager_eva; 216227825Stheravenextern struct linker_set netisr_set; 217227825Stheraven 218227825Stheraven#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 219262801Sdim 220227825Stheravenstatic void 221262801Sdimcpu_startup(dummy) 222262801Sdim void *dummy; 223262801Sdim{ 224262801Sdim register unsigned i; 225262801Sdim register caddr_t v; 226262801Sdim vm_offset_t maxaddr; 227262801Sdim vm_size_t size = 0; 228262801Sdim int firstaddr; 229262801Sdim vm_offset_t minaddr; 230262801Sdim 231262801Sdim if (boothowto & RB_VERBOSE) 232262801Sdim bootverbose++; 233262801Sdim 234262801Sdim /* 235262801Sdim * Initialize error message buffer (at end of core). 236227825Stheraven */ 237227825Stheraven 238227825Stheraven /* avail_end was pre-decremented in init386() to compensate */ 239227825Stheraven for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) 240227825Stheraven pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, 241227825Stheraven avail_end + i * PAGE_SIZE, 242227825Stheraven VM_PROT_ALL, TRUE); 243262801Sdim msgbufmapped = 1; 244262801Sdim 245262801Sdim /* 246262801Sdim * Good {morning,afternoon,evening,night}. 247262801Sdim */ 248232950Stheraven printf(version); 249227825Stheraven cpu_class = i386_cpus[cpu].cpu_class; 250262801Sdim startrtclock(); 251262801Sdim identifycpu(); 252262801Sdim printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 253262801Sdim /* 254262801Sdim * Display any holes after the first chunk of extended memory. 255227825Stheraven */ 256227825Stheraven if (badpages != 0) { 257227825Stheraven int indx = 1; 258262801Sdim 259262801Sdim /* 260262801Sdim * XXX skip reporting ISA hole & unmanaged kernel memory 261262801Sdim */ 262262801Sdim if (phys_avail[0] == PAGE_SIZE) 263227825Stheraven indx += 2; 264227825Stheraven 265227825Stheraven printf("Physical memory hole(s):\n"); 266227825Stheraven for (; phys_avail[indx + 1] != 0; indx += 2) { 267227825Stheraven int size = phys_avail[indx + 1] - phys_avail[indx]; 268227825Stheraven 269227825Stheraven printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], 270232950Stheraven phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 271227825Stheraven } 272227825Stheraven } 273227825Stheraven 274227825Stheraven /* 275227825Stheraven * Quickly wire in netisrs. 276227825Stheraven */ 277227825Stheraven setup_netisrs(&netisr_set); 278227825Stheraven 279227825Stheraven/* 280227825Stheraven#ifdef ISDN 281227825Stheraven DONET(isdnintr, NETISR_ISDN); 282227825Stheraven#endif 283227825Stheraven*/ 284227825Stheraven 285227825Stheraven /* 286227825Stheraven * Allocate space for system data structures. 287227825Stheraven * The first available kernel virtual address is in "v". 288227825Stheraven * As pages of kernel virtual memory are allocated, "v" is incremented. 289227825Stheraven * As pages of memory are allocated and cleared, 290227825Stheraven * "firstaddr" is incremented. 291262801Sdim * An index into the kernel page table corresponding to the 292227825Stheraven * virtual memory address maintained in "v" is kept in "mapaddr". 293262801Sdim */ 294262801Sdim 295262801Sdim /* 296262801Sdim * Make two passes. The first pass calculates how much memory is 297262801Sdim * needed and allocates it. The second pass assigns virtual 298262801Sdim * addresses to the various data structures. 299262801Sdim */ 300262801Sdim firstaddr = 0; 301262801Sdimagain: 302262801Sdim v = (caddr_t)firstaddr; 303262801Sdim 304262801Sdim#define valloc(name, type, num) \ 305262801Sdim (name) = (type *)v; v = (caddr_t)((name)+(num)) 306262801Sdim#define valloclim(name, type, num, lim) \ 307262801Sdim (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 308262801Sdim valloc(callout, struct callout, ncallout); 309262801Sdim#ifdef SYSVSHM 310262801Sdim valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 311262801Sdim#endif 312262801Sdim#ifdef SYSVSEM 313262801Sdim valloc(sema, struct semid_ds, seminfo.semmni); 314262801Sdim valloc(sem, struct sem, seminfo.semmns); 315262801Sdim /* This is pretty disgusting! */ 316262801Sdim valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 317262801Sdim#endif 318262801Sdim#ifdef SYSVMSG 319227825Stheraven valloc(msgpool, char, msginfo.msgmax); 320227825Stheraven valloc(msgmaps, struct msgmap, msginfo.msgseg); 321227825Stheraven valloc(msghdrs, struct msg, msginfo.msgtql); 322227825Stheraven valloc(msqids, struct msqid_ds, msginfo.msgmni); 323227825Stheraven#endif 324227825Stheraven 325227825Stheraven if (nbuf == 0) { 326227825Stheraven nbuf = 30; 327227825Stheraven if( physmem > 1024) 328227825Stheraven nbuf += min((physmem - 1024) / 12, 1024); 329249998Sdim } 330227825Stheraven nswbuf = min(nbuf, 128); 331227825Stheraven 332227825Stheraven valloc(swbuf, struct buf, nswbuf); 333227825Stheraven valloc(buf, struct buf, nbuf); 334227825Stheraven 335227825Stheraven#ifdef BOUNCE_BUFFERS 336227825Stheraven /* 337227825Stheraven * If there is more than 16MB of memory, allocate some bounce buffers 338227825Stheraven */ 339227825Stheraven if (Maxmem > 4096) { 340227825Stheraven if (bouncepages == 0) { 341227825Stheraven bouncepages = 64; 342227825Stheraven bouncepages += ((Maxmem - 4096) / 2048) * 32; 343227825Stheraven } 344227825Stheraven v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 345227825Stheraven valloc(bouncememory, char, bouncepages * PAGE_SIZE); 346227825Stheraven } 347227825Stheraven#endif 348227825Stheraven 349227825Stheraven /* 350227825Stheraven * End of first pass, size has been calculated so allocate memory 351227825Stheraven */ 352227825Stheraven if (firstaddr == 0) { 353227825Stheraven size = (vm_size_t)(v - firstaddr); 354227825Stheraven firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 355227825Stheraven if (firstaddr == 0) 356227825Stheraven panic("startup: no room for tables"); 357227825Stheraven goto again; 358227825Stheraven } 359227825Stheraven 360227825Stheraven /* 361227825Stheraven * End of second pass, addresses have been assigned 362227825Stheraven */ 363227825Stheraven if ((vm_size_t)(v - firstaddr) != size) 364227825Stheraven panic("startup: table size inconsistency"); 365227825Stheraven 366227825Stheraven#ifdef BOUNCE_BUFFERS 367227825Stheraven clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 368227825Stheraven (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 369227825Stheraven maxbkva + pager_map_size, TRUE); 370227825Stheraven io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 371227825Stheraven#else 372227825Stheraven clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 373227825Stheraven (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 374227825Stheraven#endif 375227825Stheraven buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 376227825Stheraven (nbuf*MAXBSIZE), TRUE); 377227825Stheraven pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 378227825Stheraven (nswbuf*MAXPHYS) + pager_map_size, TRUE); 379227825Stheraven exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 380227825Stheraven (16*ARG_MAX), TRUE); 381262801Sdim u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 382227825Stheraven (maxproc*UPAGES*PAGE_SIZE), FALSE); 383227825Stheraven 384227825Stheraven /* 385227825Stheraven * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 386227825Stheraven * we use the more space efficient malloc in place of kmem_alloc. 387227825Stheraven */ 388227825Stheraven mclrefcnt = (char *)malloc(nmbclusters+PAGE_SIZE/MCLBYTES, 389227825Stheraven M_MBUF, M_NOWAIT); 390227825Stheraven bzero(mclrefcnt, nmbclusters+PAGE_SIZE/MCLBYTES); 391227825Stheraven mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 392227825Stheraven nmbclusters * MCLBYTES, FALSE); 393227825Stheraven /* 394227825Stheraven * Initialize callouts 395232950Stheraven */ 396227825Stheraven callfree = callout; 397227825Stheraven for (i = 1; i < ncallout; i++) 398227825Stheraven callout[i-1].c_next = &callout[i]; 399227825Stheraven 400227825Stheraven if (boothowto & RB_CONFIG) { 401227825Stheraven userconfig(); 402227825Stheraven cninit(); /* the preferred console may have changed */ 403232950Stheraven } 404227825Stheraven 405227825Stheraven#ifdef BOUNCE_BUFFERS 406227825Stheraven /* 407227825Stheraven * init bounce buffers 408227825Stheraven */ 409227825Stheraven vm_bounce_init(); 410227825Stheraven#endif 411227825Stheraven 412227825Stheraven printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), 413227825Stheraven ptoa(cnt.v_free_count) / 1024); 414227825Stheraven 415227825Stheraven /* 416227825Stheraven * Set up buffers, so they can be used to read disk labels. 417227825Stheraven */ 418227825Stheraven bufinit(); 419227825Stheraven vm_pager_bufferinit(); 420227825Stheraven 421227825Stheraven /* 422227825Stheraven * In verbose mode, print out the BIOS's idea of the disk geometries. 423227825Stheraven */ 424227825Stheraven if (bootverbose) { 425227825Stheraven printf("BIOS Geometries:\n"); 426227825Stheraven for (i = 0; i < N_BIOS_GEOM; i++) { 427227825Stheraven unsigned long bios_geom; 428227825Stheraven int max_cylinder, max_head, max_sector; 429227825Stheraven 430227825Stheraven bios_geom = bootinfo.bi_bios_geom[i]; 431227825Stheraven 432232950Stheraven /* 433227825Stheraven * XXX the bootstrap punts a 1200K floppy geometry 434227825Stheraven * when the get-disk-geometry interrupt fails. Skip 435253159Stheraven * drives that have this geometry. 436253159Stheraven */ 437227825Stheraven if (bios_geom == 0x4f010f) 438241903Sdim continue; 439227825Stheraven 440241903Sdim printf(" %x:%08lx ", i, bios_geom); 441241903Sdim max_cylinder = bios_geom >> 16; 442241903Sdim max_head = (bios_geom >> 8) & 0xff; 443227825Stheraven max_sector = bios_geom & 0xff; 444227825Stheraven printf( 445227825Stheraven "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 446227825Stheraven max_cylinder, max_cylinder + 1, 447227825Stheraven max_head, max_head + 1, 448227825Stheraven max_sector, max_sector); 449227825Stheraven } 450227825Stheraven printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 451227825Stheraven } 452227825Stheraven} 453227825Stheraven 454227825Stheravenint 455227825Stheravenregister_netisr(num, handler) 456227825Stheraven int num; 457227825Stheraven netisr_t *handler; 458227825Stheraven{ 459232950Stheraven 460227825Stheraven if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 461232950Stheraven printf("register_netisr: bad isr number: %d\n", num); 462253159Stheraven return (EINVAL); 463227825Stheraven } 464241903Sdim netisrs[num] = handler; 465227825Stheraven return (0); 466241903Sdim} 467241903Sdim 468241903Sdimstatic void 469227825Stheravensetup_netisrs(ls) 470227825Stheraven struct linker_set *ls; 471227825Stheraven{ 472227825Stheraven int i; 473227825Stheraven const struct netisrtab *nit; 474227825Stheraven 475227825Stheraven for(i = 0; ls->ls_items[i]; i++) { 476227825Stheraven nit = (const struct netisrtab *)ls->ls_items[i]; 477227825Stheraven register_netisr(nit->nit_num, nit->nit_isr); 478227825Stheraven } 479227825Stheraven} 480227825Stheraven 481227825Stheravenstatic struct cpu_nameclass i386_cpus[] = { 482227825Stheraven { "Intel 80286", CPUCLASS_286 }, /* CPU_286 */ 483227825Stheraven { "i386SX", CPUCLASS_386 }, /* CPU_386SX */ 484227825Stheraven { "i386DX", CPUCLASS_386 }, /* CPU_386 */ 485232950Stheraven { "i486SX", CPUCLASS_486 }, /* CPU_486SX */ 486227825Stheraven { "i486DX", CPUCLASS_486 }, /* CPU_486 */ 487253159Stheraven { "Pentium", CPUCLASS_586 }, /* CPU_586 */ 488253159Stheraven { "Cy486DLC", CPUCLASS_486 }, /* CPU_486DLC */ 489227825Stheraven { "Pentium Pro", CPUCLASS_686 }, /* CPU_686 */ 490241903Sdim}; 491227825Stheraven 492241903Sdimstatic void 493241903Sdimidentifycpu() 494241903Sdim{ 495227825Stheraven printf("CPU: "); 496227825Stheraven strncpy(cpu_model, i386_cpus[cpu].cpu_name, sizeof cpu_model); 497227825Stheraven 498227825Stheraven#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 499227825Stheraven if (!strcmp(cpu_vendor,"GenuineIntel")) { 500227825Stheraven if ((cpu_id & 0xf00) > 3) { 501227825Stheraven cpu_model[0] = '\0'; 502227825Stheraven 503227825Stheraven switch (cpu_id & 0x3000) { 504227825Stheraven case 0x1000: 505227825Stheraven strcpy(cpu_model, "Overdrive "); 506227825Stheraven break; 507232950Stheraven case 0x2000: 508227825Stheraven strcpy(cpu_model, "Dual "); 509227825Stheraven break; 510227825Stheraven } 511227825Stheraven 512227825Stheraven switch (cpu_id & 0xf00) { 513227825Stheraven case 0x400: 514227825Stheraven strcat(cpu_model, "i486 "); 515227825Stheraven break; 516227825Stheraven case 0x500: 517227825Stheraven strcat(cpu_model, "Pentium"); /* nb no space */ 518227825Stheraven break; 519227825Stheraven case 0x600: 520227825Stheraven strcat(cpu_model, "Pentium Pro"); 521227825Stheraven break; 522227825Stheraven default: 523227825Stheraven strcat(cpu_model, "unknown"); 524227825Stheraven break; 525227825Stheraven } 526227825Stheraven 527232950Stheraven switch (cpu_id & 0xff0) { 528227825Stheraven case 0x400: 529227825Stheraven strcat(cpu_model, "DX"); break; 530227825Stheraven case 0x410: 531 strcat(cpu_model, "DX"); break; 532 case 0x420: 533 strcat(cpu_model, "SX"); break; 534 case 0x430: 535 strcat(cpu_model, "DX2"); break; 536 case 0x440: 537 strcat(cpu_model, "SL"); break; 538 case 0x450: 539 strcat(cpu_model, "SX2"); break; 540 case 0x470: 541 strcat(cpu_model, "DX2 Write-Back Enhanced"); 542 break; 543 case 0x480: 544 strcat(cpu_model, "DX4"); break; 545 break; 546 } 547 } 548 } 549#endif 550 printf("%s (", cpu_model); 551 switch(cpu_class) { 552 case CPUCLASS_286: 553 printf("286"); 554 break; 555#if defined(I386_CPU) 556 case CPUCLASS_386: 557 printf("386"); 558 break; 559#endif 560#if defined(I486_CPU) 561 case CPUCLASS_486: 562 printf("486"); 563 bzero = i486_bzero; 564 break; 565#endif 566#if defined(I586_CPU) 567 case CPUCLASS_586: 568 printf("%d.%02d-MHz ", 569 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 570 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 571 printf("586"); 572 break; 573#endif 574#if defined(I686_CPU) 575 case CPUCLASS_686: 576 printf("%d.%02d-MHz ", 577 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 578 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 579 printf("686"); 580 break; 581#endif 582 default: 583 printf("unknown"); /* will panic below... */ 584 } 585 printf("-class CPU)\n"); 586#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 587 if(*cpu_vendor) 588 printf(" Origin = \"%s\"",cpu_vendor); 589 if(cpu_id) 590 printf(" Id = 0x%lx",cpu_id); 591 592 if (!strcmp(cpu_vendor, "GenuineIntel")) { 593 printf(" Stepping=%ld", cpu_id & 0xf); 594 if (cpu_high > 0) { 595 printf("\n Features=0x%b", cpu_feature, 596 "\020" 597 "\001FPU" 598 "\002VME" 599 "\003DE" 600 "\004PSE" 601 "\005TSC" 602 "\006MSR" 603 "\007PAE" 604 "\010MCE" 605 "\011CX8" 606 "\012APIC" 607 "\013<b10>" 608 "\014<b11>" 609 "\015MTRR" 610 "\016PGE" 611 "\017MCA" 612 "\020CMOV" 613 ); 614 } 615 } 616 /* Avoid ugly blank lines: only print newline when we have to. */ 617 if (*cpu_vendor || cpu_id) 618 printf("\n"); 619#endif 620 /* 621 * Now that we have told the user what they have, 622 * let them know if that machine type isn't configured. 623 */ 624 switch (cpu_class) { 625 case CPUCLASS_286: /* a 286 should not make it this far, anyway */ 626#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) && !defined(I686_CPU) 627#error This kernel is not configured for one of the supported CPUs 628#endif 629#if !defined(I386_CPU) 630 case CPUCLASS_386: 631#endif 632#if !defined(I486_CPU) 633 case CPUCLASS_486: 634#endif 635#if !defined(I586_CPU) 636 case CPUCLASS_586: 637#endif 638#if !defined(I686_CPU) 639 case CPUCLASS_686: 640#endif 641 panic("CPU class not configured"); 642 default: 643 break; 644 } 645#ifdef PERFMON 646 perfmon_init(); 647#endif 648 dev_attach(&kdc_cpu0); 649} 650 651/* 652 * Send an interrupt to process. 653 * 654 * Stack is set up to allow sigcode stored 655 * at top to call routine, followed by kcall 656 * to sigreturn routine below. After sigreturn 657 * resets the signal mask, the stack, and the 658 * frame pointer, it returns to the user 659 * specified pc, psl. 660 */ 661void 662sendsig(catcher, sig, mask, code) 663 sig_t catcher; 664 int sig, mask; 665 u_long code; 666{ 667 register struct proc *p = curproc; 668 register int *regs; 669 register struct sigframe *fp; 670 struct sigframe sf; 671 struct sigacts *psp = p->p_sigacts; 672 int oonstack; 673 674 regs = p->p_md.md_regs; 675 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 676 /* 677 * Allocate and validate space for the signal handler context. 678 */ 679 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 680 (psp->ps_sigonstack & sigmask(sig))) { 681 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 682 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 683 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 684 } else { 685 fp = (struct sigframe *)regs[tESP] - 1; 686 } 687 688 /* 689 * grow() will return FALSE if the fp will not fit inside the stack 690 * and the stack can not be grown. useracc will return FALSE 691 * if access is denied. 692 */ 693 if ((grow(p, (int)fp) == FALSE) || 694 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 695 /* 696 * Process has trashed its stack; give it an illegal 697 * instruction to halt it in its tracks. 698 */ 699 SIGACTION(p, SIGILL) = SIG_DFL; 700 sig = sigmask(SIGILL); 701 p->p_sigignore &= ~sig; 702 p->p_sigcatch &= ~sig; 703 p->p_sigmask &= ~sig; 704 psignal(p, SIGILL); 705 return; 706 } 707 708 /* 709 * Build the argument list for the signal handler. 710 */ 711 if (p->p_sysent->sv_sigtbl) { 712 if (sig < p->p_sysent->sv_sigsize) 713 sig = p->p_sysent->sv_sigtbl[sig]; 714 else 715 sig = p->p_sysent->sv_sigsize + 1; 716 } 717 sf.sf_signum = sig; 718 sf.sf_code = code; 719 sf.sf_scp = &fp->sf_sc; 720 sf.sf_addr = (char *) regs[tERR]; 721 sf.sf_handler = catcher; 722 723 /* save scratch registers */ 724 sf.sf_sc.sc_eax = regs[tEAX]; 725 sf.sf_sc.sc_ebx = regs[tEBX]; 726 sf.sf_sc.sc_ecx = regs[tECX]; 727 sf.sf_sc.sc_edx = regs[tEDX]; 728 sf.sf_sc.sc_esi = regs[tESI]; 729 sf.sf_sc.sc_edi = regs[tEDI]; 730 sf.sf_sc.sc_cs = regs[tCS]; 731 sf.sf_sc.sc_ds = regs[tDS]; 732 sf.sf_sc.sc_ss = regs[tSS]; 733 sf.sf_sc.sc_es = regs[tES]; 734 sf.sf_sc.sc_isp = regs[tISP]; 735 736 /* 737 * Build the signal context to be used by sigreturn. 738 */ 739 sf.sf_sc.sc_onstack = oonstack; 740 sf.sf_sc.sc_mask = mask; 741 sf.sf_sc.sc_sp = regs[tESP]; 742 sf.sf_sc.sc_fp = regs[tEBP]; 743 sf.sf_sc.sc_pc = regs[tEIP]; 744 sf.sf_sc.sc_ps = regs[tEFLAGS]; 745 746 /* 747 * Copy the sigframe out to the user's stack. 748 */ 749 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 750 /* 751 * Something is wrong with the stack pointer. 752 * ...Kill the process. 753 */ 754 sigexit(p, SIGILL); 755 }; 756 757 regs[tESP] = (int)fp; 758 regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); 759 regs[tEFLAGS] &= ~PSL_VM; 760 regs[tCS] = _ucodesel; 761 regs[tDS] = _udatasel; 762 regs[tES] = _udatasel; 763 regs[tSS] = _udatasel; 764} 765 766/* 767 * System call to cleanup state after a signal 768 * has been taken. Reset signal mask and 769 * stack state from context left by sendsig (above). 770 * Return to previous pc and psl as specified by 771 * context left by sendsig. Check carefully to 772 * make sure that the user has not modified the 773 * state to gain improper privileges. 774 */ 775int 776sigreturn(p, uap, retval) 777 struct proc *p; 778 struct sigreturn_args /* { 779 struct sigcontext *sigcntxp; 780 } */ *uap; 781 int *retval; 782{ 783 register struct sigcontext *scp; 784 register struct sigframe *fp; 785 register int *regs = p->p_md.md_regs; 786 int eflags; 787 788 /* 789 * (XXX old comment) regs[tESP] points to the return address. 790 * The user scp pointer is above that. 791 * The return address is faked in the signal trampoline code 792 * for consistency. 793 */ 794 scp = uap->sigcntxp; 795 fp = (struct sigframe *) 796 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 797 798 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 799 return(EINVAL); 800 801 /* 802 * Don't allow users to change privileged or reserved flags. 803 */ 804#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 805 eflags = scp->sc_ps; 806 /* 807 * XXX do allow users to change the privileged flag PSL_RF. The 808 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 809 * sometimes set it there too. tf_eflags is kept in the signal 810 * context during signal handling and there is no other place 811 * to remember it, so the PSL_RF bit may be corrupted by the 812 * signal handler without us knowing. Corruption of the PSL_RF 813 * bit at worst causes one more or one less debugger trap, so 814 * allowing it is fairly harmless. 815 */ 816 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 817#ifdef DEBUG 818 printf("sigreturn: eflags = 0x%x\n", eflags); 819#endif 820 return(EINVAL); 821 } 822 823 /* 824 * Don't allow users to load a valid privileged %cs. Let the 825 * hardware check for invalid selectors, excess privilege in 826 * other selectors, invalid %eip's and invalid %esp's. 827 */ 828#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 829 if (!CS_SECURE(scp->sc_cs)) { 830#ifdef DEBUG 831 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 832#endif 833 trapsignal(p, SIGBUS, T_PROTFLT); 834 return(EINVAL); 835 } 836 837 /* restore scratch registers */ 838 regs[tEAX] = scp->sc_eax; 839 regs[tEBX] = scp->sc_ebx; 840 regs[tECX] = scp->sc_ecx; 841 regs[tEDX] = scp->sc_edx; 842 regs[tESI] = scp->sc_esi; 843 regs[tEDI] = scp->sc_edi; 844 regs[tCS] = scp->sc_cs; 845 regs[tDS] = scp->sc_ds; 846 regs[tES] = scp->sc_es; 847 regs[tSS] = scp->sc_ss; 848 regs[tISP] = scp->sc_isp; 849 850 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 851 return(EINVAL); 852 853 if (scp->sc_onstack & 01) 854 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 855 else 856 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 857 p->p_sigmask = scp->sc_mask &~ 858 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 859 regs[tEBP] = scp->sc_fp; 860 regs[tESP] = scp->sc_sp; 861 regs[tEIP] = scp->sc_pc; 862 regs[tEFLAGS] = eflags; 863 return(EJUSTRETURN); 864} 865 866static int waittime = -1; 867static struct pcb dumppcb; 868 869__dead void 870boot(howto) 871 int howto; 872{ 873 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 874 register struct buf *bp; 875 int iter, nbusy; 876 877 waittime = 0; 878 printf("\nsyncing disks... "); 879 880 sync(&proc0, NULL, NULL); 881 882 for (iter = 0; iter < 20; iter++) { 883 nbusy = 0; 884 for (bp = &buf[nbuf]; --bp >= buf; ) { 885 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 886 nbusy++; 887 } 888 } 889 if (nbusy == 0) 890 break; 891 printf("%d ", nbusy); 892 DELAY(40000 * iter); 893 } 894 if (nbusy) { 895 /* 896 * Failed to sync all blocks. Indicate this and don't 897 * unmount filesystems (thus forcing an fsck on reboot). 898 */ 899 printf("giving up\n"); 900#ifdef SHOW_BUSYBUFS 901 nbusy = 0; 902 for (bp = &buf[nbuf]; --bp >= buf; ) { 903 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 904 nbusy++; 905 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 906 } 907 } 908 DELAY(5000000); /* 5 seconds */ 909#endif 910 } else { 911 printf("done\n"); 912 /* 913 * Unmount filesystems 914 */ 915 if (panicstr == 0) 916 vfs_unmountall(); 917 } 918 DELAY(100000); /* wait for console output to finish */ 919 dev_shutdownall(FALSE); 920 } 921 splhigh(); 922 if (howto & RB_HALT) { 923 printf("\n"); 924 printf("The operating system has halted.\n"); 925 printf("Please press any key to reboot.\n\n"); 926 cngetc(); 927 } else { 928 if (howto & RB_DUMP) { 929 if (!cold) { 930 savectx(&dumppcb); 931 dumppcb.pcb_ptd = rcr3(); 932 dumpsys(); 933 } 934 935 if (PANIC_REBOOT_WAIT_TIME != 0) { 936 if (PANIC_REBOOT_WAIT_TIME != -1) { 937 int loop; 938 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 939 PANIC_REBOOT_WAIT_TIME); 940 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 941 DELAY(1000 * 100); /* 1/10th second */ 942 if (cncheckc()) /* Did user type a key? */ 943 break; 944 } 945 if (!loop) 946 goto die; 947 } 948 } else { /* zero time specified - reboot NOW */ 949 goto die; 950 } 951 printf("--> Press a key on the console to reboot <--\n"); 952 cngetc(); 953 } 954 } 955die: 956 printf("Rebooting...\n"); 957 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 958 cpu_reset(); 959 for(;;) ; 960 /* NOTREACHED */ 961} 962 963/* 964 * Magic number for savecore 965 * 966 * exported (symorder) and used at least by savecore(8) 967 * 968 */ 969u_long dumpmag = 0x8fca0101UL; 970 971static int dumpsize = 0; /* also for savecore */ 972 973static int dodump = 1; 974SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 975 976/* 977 * Doadump comes here after turning off memory management and 978 * getting on the dump stack, either when called above, or by 979 * the auto-restart code. 980 */ 981static void 982dumpsys() 983{ 984 985 if (!dodump) 986 return; 987 if (dumpdev == NODEV) 988 return; 989 if ((minor(dumpdev)&07) != 1) 990 return; 991 if (!(bdevsw[major(dumpdev)])) 992 return; 993 if (!(bdevsw[major(dumpdev)]->d_dump)) 994 return; 995 dumpsize = Maxmem; 996 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 997 printf("dump "); 998 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 999 1000 case ENXIO: 1001 printf("device bad\n"); 1002 break; 1003 1004 case EFAULT: 1005 printf("device not ready\n"); 1006 break; 1007 1008 case EINVAL: 1009 printf("area improper\n"); 1010 break; 1011 1012 case EIO: 1013 printf("i/o error\n"); 1014 break; 1015 1016 case EINTR: 1017 printf("aborted from console\n"); 1018 break; 1019 1020 default: 1021 printf("succeeded\n"); 1022 break; 1023 } 1024} 1025 1026/* 1027 * Clear registers on exec 1028 */ 1029void 1030setregs(p, entry, stack) 1031 struct proc *p; 1032 u_long entry; 1033 u_long stack; 1034{ 1035 int *regs = p->p_md.md_regs; 1036 1037#ifdef USER_LDT 1038 struct pcb *pcb = &p->p_addr->u_pcb; 1039 1040 /* was i386_user_cleanup() in NetBSD */ 1041 if (pcb->pcb_ldt) { 1042 if (pcb == curpcb) 1043 lldt(GSEL(GUSERLDT_SEL, SEL_KPL)); 1044 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 1045 pcb->pcb_ldt_len * sizeof(union descriptor)); 1046 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 1047 } 1048#endif 1049 1050 bzero(regs, sizeof(struct trapframe)); 1051 regs[tEIP] = entry; 1052 regs[tESP] = stack; 1053 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 1054 regs[tSS] = _udatasel; 1055 regs[tDS] = _udatasel; 1056 regs[tES] = _udatasel; 1057 regs[tCS] = _ucodesel; 1058 1059 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 1060 load_cr0(rcr0() | CR0_TS); /* start emulating */ 1061#if NNPX > 0 1062 npxinit(__INITIAL_NPXCW__); 1063#endif /* NNPX > 0 */ 1064} 1065 1066static int 1067sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1068{ 1069 int error; 1070 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1071 req); 1072 if (!error && req->newptr) 1073 resettodr(); 1074 return (error); 1075} 1076 1077SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1078 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1079 1080SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1081 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1082 1083SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1084 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1085 1086SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1087 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1088 1089/* 1090 * Initialize 386 and configure to run kernel 1091 */ 1092 1093/* 1094 * Initialize segments & interrupt table 1095 */ 1096 1097int currentldt; 1098int _default_ldt; 1099union descriptor gdt[NGDT]; /* global descriptor table */ 1100struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 1101union descriptor ldt[NLDT]; /* local descriptor table */ 1102 1103static struct i386tss dblfault_tss; 1104static char dblfault_stack[PAGE_SIZE]; 1105 1106extern struct user *proc0paddr; 1107 1108/* software prototypes -- in more palatable form */ 1109struct soft_segment_descriptor gdt_segs[] = { 1110/* GNULL_SEL 0 Null Descriptor */ 1111{ 0x0, /* segment base address */ 1112 0x0, /* length */ 1113 0, /* segment type */ 1114 0, /* segment descriptor priority level */ 1115 0, /* segment descriptor present */ 1116 0, 0, 1117 0, /* default 32 vs 16 bit size */ 1118 0 /* limit granularity (byte/page units)*/ }, 1119/* GCODE_SEL 1 Code Descriptor for kernel */ 1120{ 0x0, /* segment base address */ 1121 0xfffff, /* length - all address space */ 1122 SDT_MEMERA, /* segment type */ 1123 0, /* segment descriptor priority level */ 1124 1, /* segment descriptor present */ 1125 0, 0, 1126 1, /* default 32 vs 16 bit size */ 1127 1 /* limit granularity (byte/page units)*/ }, 1128/* GDATA_SEL 2 Data Descriptor for kernel */ 1129{ 0x0, /* segment base address */ 1130 0xfffff, /* length - all address space */ 1131 SDT_MEMRWA, /* segment type */ 1132 0, /* segment descriptor priority level */ 1133 1, /* segment descriptor present */ 1134 0, 0, 1135 1, /* default 32 vs 16 bit size */ 1136 1 /* limit granularity (byte/page units)*/ }, 1137/* GLDT_SEL 3 LDT Descriptor */ 1138{ (int) ldt, /* segment base address */ 1139 sizeof(ldt)-1, /* length - all address space */ 1140 SDT_SYSLDT, /* segment type */ 1141 0, /* segment descriptor priority level */ 1142 1, /* segment descriptor present */ 1143 0, 0, 1144 0, /* unused - default 32 vs 16 bit size */ 1145 0 /* limit granularity (byte/page units)*/ }, 1146/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 1147{ 0x0, /* segment base address */ 1148 0x0, /* length - all address space */ 1149 0, /* segment type */ 1150 0, /* segment descriptor priority level */ 1151 0, /* segment descriptor present */ 1152 0, 0, 1153 0, /* default 32 vs 16 bit size */ 1154 0 /* limit granularity (byte/page units)*/ }, 1155/* GPANIC_SEL 5 Panic Tss Descriptor */ 1156{ (int) &dblfault_tss, /* segment base address */ 1157 sizeof(struct i386tss)-1,/* length - all address space */ 1158 SDT_SYS386TSS, /* segment type */ 1159 0, /* segment descriptor priority level */ 1160 1, /* segment descriptor present */ 1161 0, 0, 1162 0, /* unused - default 32 vs 16 bit size */ 1163 0 /* limit granularity (byte/page units)*/ }, 1164/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1165{ (int) kstack, /* segment base address */ 1166 sizeof(struct i386tss)-1,/* length - all address space */ 1167 SDT_SYS386TSS, /* segment type */ 1168 0, /* segment descriptor priority level */ 1169 1, /* segment descriptor present */ 1170 0, 0, 1171 0, /* unused - default 32 vs 16 bit size */ 1172 0 /* limit granularity (byte/page units)*/ }, 1173/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1174{ (int) ldt, /* segment base address */ 1175 (512 * sizeof(union descriptor)-1), /* length */ 1176 SDT_SYSLDT, /* segment type */ 1177 0, /* segment descriptor priority level */ 1178 1, /* segment descriptor present */ 1179 0, 0, 1180 0, /* unused - default 32 vs 16 bit size */ 1181 0 /* limit granularity (byte/page units)*/ }, 1182/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1183{ 0, /* segment base address (overwritten by APM) */ 1184 0xfffff, /* length */ 1185 SDT_MEMERA, /* segment type */ 1186 0, /* segment descriptor priority level */ 1187 1, /* segment descriptor present */ 1188 0, 0, 1189 1, /* default 32 vs 16 bit size */ 1190 1 /* limit granularity (byte/page units)*/ }, 1191/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1192{ 0, /* segment base address (overwritten by APM) */ 1193 0xfffff, /* length */ 1194 SDT_MEMERA, /* segment type */ 1195 0, /* segment descriptor priority level */ 1196 1, /* segment descriptor present */ 1197 0, 0, 1198 0, /* default 32 vs 16 bit size */ 1199 1 /* limit granularity (byte/page units)*/ }, 1200/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1201{ 0, /* segment base address (overwritten by APM) */ 1202 0xfffff, /* length */ 1203 SDT_MEMRWA, /* segment type */ 1204 0, /* segment descriptor priority level */ 1205 1, /* segment descriptor present */ 1206 0, 0, 1207 1, /* default 32 vs 16 bit size */ 1208 1 /* limit granularity (byte/page units)*/ }, 1209}; 1210 1211static struct soft_segment_descriptor ldt_segs[] = { 1212 /* Null Descriptor - overwritten by call gate */ 1213{ 0x0, /* segment base address */ 1214 0x0, /* length - all address space */ 1215 0, /* segment type */ 1216 0, /* segment descriptor priority level */ 1217 0, /* segment descriptor present */ 1218 0, 0, 1219 0, /* default 32 vs 16 bit size */ 1220 0 /* limit granularity (byte/page units)*/ }, 1221 /* Null Descriptor - overwritten by call gate */ 1222{ 0x0, /* segment base address */ 1223 0x0, /* length - all address space */ 1224 0, /* segment type */ 1225 0, /* segment descriptor priority level */ 1226 0, /* segment descriptor present */ 1227 0, 0, 1228 0, /* default 32 vs 16 bit size */ 1229 0 /* limit granularity (byte/page units)*/ }, 1230 /* Null Descriptor - overwritten by call gate */ 1231{ 0x0, /* segment base address */ 1232 0x0, /* length - all address space */ 1233 0, /* segment type */ 1234 0, /* segment descriptor priority level */ 1235 0, /* segment descriptor present */ 1236 0, 0, 1237 0, /* default 32 vs 16 bit size */ 1238 0 /* limit granularity (byte/page units)*/ }, 1239 /* Code Descriptor for user */ 1240{ 0x0, /* segment base address */ 1241 0xfffff, /* length - all address space */ 1242 SDT_MEMERA, /* segment type */ 1243 SEL_UPL, /* segment descriptor priority level */ 1244 1, /* segment descriptor present */ 1245 0, 0, 1246 1, /* default 32 vs 16 bit size */ 1247 1 /* limit granularity (byte/page units)*/ }, 1248 /* Data Descriptor for user */ 1249{ 0x0, /* segment base address */ 1250 0xfffff, /* length - all address space */ 1251 SDT_MEMRWA, /* segment type */ 1252 SEL_UPL, /* segment descriptor priority level */ 1253 1, /* segment descriptor present */ 1254 0, 0, 1255 1, /* default 32 vs 16 bit size */ 1256 1 /* limit granularity (byte/page units)*/ }, 1257}; 1258 1259void 1260setidt(idx, func, typ, dpl, selec) 1261 int idx; 1262 inthand_t *func; 1263 int typ; 1264 int dpl; 1265 int selec; 1266{ 1267 struct gate_descriptor *ip = idt + idx; 1268 1269 ip->gd_looffset = (int)func; 1270 ip->gd_selector = selec; 1271 ip->gd_stkcpy = 0; 1272 ip->gd_xx = 0; 1273 ip->gd_type = typ; 1274 ip->gd_dpl = dpl; 1275 ip->gd_p = 1; 1276 ip->gd_hioffset = ((int)func)>>16 ; 1277} 1278 1279#define IDTVEC(name) __CONCAT(X,name) 1280 1281extern inthand_t 1282 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1283 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1284 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1285 IDTVEC(page), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1286 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1287 1288void 1289sdtossd(sd, ssd) 1290 struct segment_descriptor *sd; 1291 struct soft_segment_descriptor *ssd; 1292{ 1293 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1294 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1295 ssd->ssd_type = sd->sd_type; 1296 ssd->ssd_dpl = sd->sd_dpl; 1297 ssd->ssd_p = sd->sd_p; 1298 ssd->ssd_def32 = sd->sd_def32; 1299 ssd->ssd_gran = sd->sd_gran; 1300} 1301 1302void 1303init386(first) 1304 int first; 1305{ 1306 int x; 1307 unsigned biosbasemem, biosextmem; 1308 struct gate_descriptor *gdp; 1309 int gsel_tss; 1310 /* table descriptors - used to load tables by microp */ 1311 struct region_descriptor r_gdt, r_idt; 1312 int pagesinbase, pagesinext; 1313 int target_page, pa_indx; 1314 1315 proc0.p_addr = proc0paddr; 1316 1317 atdevbase = ISA_HOLE_START + KERNBASE; 1318 1319 /* 1320 * Initialize the console before we print anything out. 1321 */ 1322 cninit(); 1323 1324 /* 1325 * make gdt memory segments, the code segment goes up to end of the 1326 * page with etext in it, the data segment goes to the end of 1327 * the address space 1328 */ 1329 /* 1330 * XXX text protection is temporarily (?) disabled. The limit was 1331 * i386_btop(round_page(etext)) - 1. 1332 */ 1333 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1334 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1335 for (x = 0; x < NGDT; x++) 1336 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1337 1338 /* make ldt memory segments */ 1339 /* 1340 * The data segment limit must not cover the user area because we 1341 * don't want the user area to be writable in copyout() etc. (page 1342 * level protection is lost in kernel mode on 386's). Also, we 1343 * don't want the user area to be writable directly (page level 1344 * protection of the user area is not available on 486's with 1345 * CR0_WP set, because there is no user-read/kernel-write mode). 1346 * 1347 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1348 * should be spelled ...MAX_USER... 1349 */ 1350#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1351 /* 1352 * The code segment limit has to cover the user area until we move 1353 * the signal trampoline out of the user area. This is safe because 1354 * the code segment cannot be written to directly. 1355 */ 1356#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1357 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1358 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1359 /* Note. eventually want private ldts per process */ 1360 for (x = 0; x < NLDT; x++) 1361 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1362 1363 /* exceptions */ 1364 for (x = 0; x < NIDT; x++) 1365 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1366 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1367 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1368 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1369 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1370 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1371 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1372 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1373 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1374 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1375 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1376 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1377 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1378 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1379 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1380 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1381 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1382 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1383 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1384 setidt(0x80, &IDTVEC(int0x80_syscall), 1385 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1386 1387#include "isa.h" 1388#if NISA >0 1389 isa_defaultirq(); 1390#endif 1391 rand_initialize(); 1392 1393 r_gdt.rd_limit = sizeof(gdt) - 1; 1394 r_gdt.rd_base = (int) gdt; 1395 lgdt(&r_gdt); 1396 1397 r_idt.rd_limit = sizeof(idt) - 1; 1398 r_idt.rd_base = (int) idt; 1399 lidt(&r_idt); 1400 1401 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1402 lldt(_default_ldt); 1403 currentldt = _default_ldt; 1404 1405#ifdef DDB 1406 kdb_init(); 1407 if (boothowto & RB_KDB) 1408 Debugger("Boot flags requested debugger"); 1409#endif 1410 1411 /* Use BIOS values stored in RTC CMOS RAM, since probing 1412 * breaks certain 386 AT relics. 1413 */ 1414 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1415 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1416 1417 /* 1418 * Print a warning if the official BIOS interface disagrees 1419 * with the hackish interface used above. Eventually only 1420 * the official interface should be used. 1421 */ 1422 if (bootinfo.bi_memsizes_valid) { 1423 if (bootinfo.bi_basemem != biosbasemem) 1424 printf("BIOS basemem (%ldK) != RTC basemem (%dK)\n", 1425 bootinfo.bi_basemem, biosbasemem); 1426 if (bootinfo.bi_extmem != biosextmem) 1427 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1428 bootinfo.bi_extmem, biosextmem); 1429 } 1430 1431 /* 1432 * If BIOS tells us that it has more than 640k in the basemem, 1433 * don't believe it - set it to 640k. 1434 */ 1435 if (biosbasemem > 640) 1436 biosbasemem = 640; 1437 1438 /* 1439 * Some 386 machines might give us a bogus number for extended 1440 * mem. If this happens, stop now. 1441 */ 1442#ifndef LARGEMEM 1443 if (biosextmem > 65536) { 1444 panic("extended memory beyond limit of 64MB"); 1445 /* NOTREACHED */ 1446 } 1447#endif 1448 1449 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1450 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1451 1452 /* 1453 * Special hack for chipsets that still remap the 384k hole when 1454 * there's 16MB of memory - this really confuses people that 1455 * are trying to use bus mastering ISA controllers with the 1456 * "16MB limit"; they only have 16MB, but the remapping puts 1457 * them beyond the limit. 1458 */ 1459 /* 1460 * If extended memory is between 15-16MB (16-17MB phys address range), 1461 * chop it to 15MB. 1462 */ 1463 if ((pagesinext > 3840) && (pagesinext < 4096)) 1464 pagesinext = 3840; 1465 1466 /* 1467 * Maxmem isn't the "maximum memory", it's one larger than the 1468 * highest page of of the physical address space. It 1469 */ 1470 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1471 1472#ifdef MAXMEM 1473 Maxmem = MAXMEM/4; 1474#endif 1475 1476 /* call pmap initialization to make new kernel address space */ 1477 pmap_bootstrap (first, 0); 1478 1479 /* 1480 * Size up each available chunk of physical memory. 1481 */ 1482 1483 /* 1484 * We currently don't bother testing base memory. 1485 * XXX ...but we probably should. 1486 */ 1487 pa_indx = 0; 1488 badpages = 0; 1489 if (pagesinbase > 1) { 1490 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1491 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1492 physmem = pagesinbase - 1; 1493 } else { 1494 /* point at first chunk end */ 1495 pa_indx++; 1496 } 1497 1498 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1499 int tmp, page_bad = FALSE; 1500 1501 /* 1502 * map page into kernel: valid, read/write, non-cacheable 1503 */ 1504 *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; 1505 pmap_update(); 1506 1507 tmp = *(int *)CADDR1; 1508 /* 1509 * Test for alternating 1's and 0's 1510 */ 1511 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1512 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1513 page_bad = TRUE; 1514 } 1515 /* 1516 * Test for alternating 0's and 1's 1517 */ 1518 *(volatile int *)CADDR1 = 0x55555555; 1519 if (*(volatile int *)CADDR1 != 0x55555555) { 1520 page_bad = TRUE; 1521 } 1522 /* 1523 * Test for all 1's 1524 */ 1525 *(volatile int *)CADDR1 = 0xffffffff; 1526 if (*(volatile int *)CADDR1 != 0xffffffff) { 1527 page_bad = TRUE; 1528 } 1529 /* 1530 * Test for all 0's 1531 */ 1532 *(volatile int *)CADDR1 = 0x0; 1533 if (*(volatile int *)CADDR1 != 0x0) { 1534 /* 1535 * test of page failed 1536 */ 1537 page_bad = TRUE; 1538 } 1539 /* 1540 * Restore original value. 1541 */ 1542 *(int *)CADDR1 = tmp; 1543 1544 /* 1545 * Adjust array of valid/good pages. 1546 */ 1547 if (page_bad == FALSE) { 1548 /* 1549 * If this good page is a continuation of the 1550 * previous set of good pages, then just increase 1551 * the end pointer. Otherwise start a new chunk. 1552 * Note that "end" points one higher than end, 1553 * making the range >= start and < end. 1554 */ 1555 if (phys_avail[pa_indx] == target_page) { 1556 phys_avail[pa_indx] += PAGE_SIZE; 1557 } else { 1558 pa_indx++; 1559 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1560 printf("Too many holes in the physical address space, giving up\n"); 1561 pa_indx--; 1562 break; 1563 } 1564 phys_avail[pa_indx++] = target_page; /* start */ 1565 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1566 } 1567 physmem++; 1568 } else { 1569 badpages++; 1570 page_bad = FALSE; 1571 } 1572 } 1573 1574 *(int *)CMAP1 = 0; 1575 pmap_update(); 1576 1577 /* 1578 * XXX 1579 * The last chunk must contain at least one page plus the message 1580 * buffer to avoid complicating other code (message buffer address 1581 * calculation, etc.). 1582 */ 1583 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1584 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1585 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1586 phys_avail[pa_indx--] = 0; 1587 phys_avail[pa_indx--] = 0; 1588 } 1589 1590 Maxmem = atop(phys_avail[pa_indx]); 1591 1592 /* Trim off space for the message buffer. */ 1593 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1594 1595 avail_end = phys_avail[pa_indx]; 1596 1597 /* now running on new page tables, configured,and u/iom is accessible */ 1598 1599 /* make a initial tss so microp can get interrupt stack on syscall! */ 1600 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*PAGE_SIZE; 1601 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1602 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1603 1604 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1605 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1606 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1607 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1608 dblfault_tss.tss_cr3 = IdlePTD; 1609 dblfault_tss.tss_eip = (int) dblfault_handler; 1610 dblfault_tss.tss_eflags = PSL_KERNEL; 1611 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = dblfault_tss.tss_gs = 1612 GSEL(GDATA_SEL, SEL_KPL); 1613 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1614 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1615 1616 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1617 (sizeof(struct i386tss))<<16; 1618 1619 ltr(gsel_tss); 1620 1621 /* make a call gate to reenter kernel with */ 1622 gdp = &ldt[LSYS5CALLS_SEL].gd; 1623 1624 x = (int) &IDTVEC(syscall); 1625 gdp->gd_looffset = x++; 1626 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1627 gdp->gd_stkcpy = 1; 1628 gdp->gd_type = SDT_SYS386CGT; 1629 gdp->gd_dpl = SEL_UPL; 1630 gdp->gd_p = 1; 1631 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1632 1633 /* transfer to user mode */ 1634 1635 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1636 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1637 1638 /* setup proc 0's pcb */ 1639 proc0.p_addr->u_pcb.pcb_flags = 0; 1640 proc0.p_addr->u_pcb.pcb_ptd = IdlePTD; 1641} 1642 1643/* 1644 * The registers are in the frame; the frame is in the user area of 1645 * the process in question; when the process is active, the registers 1646 * are in "the kernel stack"; when it's not, they're still there, but 1647 * things get flipped around. So, since p->p_md.md_regs is the whole address 1648 * of the register set, take its offset from the kernel stack, and 1649 * index into the user block. Don't you just *love* virtual memory? 1650 * (I'm starting to think seymour is right...) 1651 */ 1652#define TF_REGP(p) ((struct trapframe *) \ 1653 ((char *)(p)->p_addr \ 1654 + ((char *)(p)->p_md.md_regs - kstack))) 1655 1656int 1657ptrace_set_pc(p, addr) 1658 struct proc *p; 1659 unsigned int addr; 1660{ 1661 TF_REGP(p)->tf_eip = addr; 1662 return (0); 1663} 1664 1665int 1666ptrace_single_step(p) 1667 struct proc *p; 1668{ 1669 TF_REGP(p)->tf_eflags |= PSL_T; 1670 return (0); 1671} 1672 1673int ptrace_write_u(p, off, data) 1674 struct proc *p; 1675 vm_offset_t off; 1676 int data; 1677{ 1678 struct trapframe frame_copy; 1679 vm_offset_t min; 1680 struct trapframe *tp; 1681 1682 /* 1683 * Privileged kernel state is scattered all over the user area. 1684 * Only allow write access to parts of regs and to fpregs. 1685 */ 1686 min = (char *)p->p_md.md_regs - kstack; 1687 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1688 tp = TF_REGP(p); 1689 frame_copy = *tp; 1690 *(int *)((char *)&frame_copy + (off - min)) = data; 1691 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1692 !CS_SECURE(frame_copy.tf_cs)) 1693 return (EINVAL); 1694 *(int*)((char *)p->p_addr + off) = data; 1695 return (0); 1696 } 1697 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1698 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1699 *(int*)((char *)p->p_addr + off) = data; 1700 return (0); 1701 } 1702 return (EFAULT); 1703} 1704 1705int 1706fill_regs(p, regs) 1707 struct proc *p; 1708 struct reg *regs; 1709{ 1710 struct trapframe *tp; 1711 1712 tp = TF_REGP(p); 1713 regs->r_es = tp->tf_es; 1714 regs->r_ds = tp->tf_ds; 1715 regs->r_edi = tp->tf_edi; 1716 regs->r_esi = tp->tf_esi; 1717 regs->r_ebp = tp->tf_ebp; 1718 regs->r_ebx = tp->tf_ebx; 1719 regs->r_edx = tp->tf_edx; 1720 regs->r_ecx = tp->tf_ecx; 1721 regs->r_eax = tp->tf_eax; 1722 regs->r_eip = tp->tf_eip; 1723 regs->r_cs = tp->tf_cs; 1724 regs->r_eflags = tp->tf_eflags; 1725 regs->r_esp = tp->tf_esp; 1726 regs->r_ss = tp->tf_ss; 1727 return (0); 1728} 1729 1730int 1731set_regs(p, regs) 1732 struct proc *p; 1733 struct reg *regs; 1734{ 1735 struct trapframe *tp; 1736 1737 tp = TF_REGP(p); 1738 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1739 !CS_SECURE(regs->r_cs)) 1740 return (EINVAL); 1741 tp->tf_es = regs->r_es; 1742 tp->tf_ds = regs->r_ds; 1743 tp->tf_edi = regs->r_edi; 1744 tp->tf_esi = regs->r_esi; 1745 tp->tf_ebp = regs->r_ebp; 1746 tp->tf_ebx = regs->r_ebx; 1747 tp->tf_edx = regs->r_edx; 1748 tp->tf_ecx = regs->r_ecx; 1749 tp->tf_eax = regs->r_eax; 1750 tp->tf_eip = regs->r_eip; 1751 tp->tf_cs = regs->r_cs; 1752 tp->tf_eflags = regs->r_eflags; 1753 tp->tf_esp = regs->r_esp; 1754 tp->tf_ss = regs->r_ss; 1755 return (0); 1756} 1757 1758#ifndef DDB 1759void 1760Debugger(const char *msg) 1761{ 1762 printf("Debugger(\"%s\") called.\n", msg); 1763} 1764#endif /* no DDB */ 1765 1766#include <sys/disklabel.h> 1767#define b_cylin b_resid 1768/* 1769 * Determine the size of the transfer, and make sure it is 1770 * within the boundaries of the partition. Adjust transfer 1771 * if needed, and signal errors or early completion. 1772 */ 1773int 1774bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1775{ 1776 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1777 int labelsect = lp->d_partitions[0].p_offset; 1778 int maxsz = p->p_size, 1779 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1780 1781 /* overwriting disk label ? */ 1782 /* XXX should also protect bootstrap in first 8K */ 1783 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1784#if LABELSECTOR != 0 1785 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1786#endif 1787 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1788 bp->b_error = EROFS; 1789 goto bad; 1790 } 1791 1792#if defined(DOSBBSECTOR) && defined(notyet) 1793 /* overwriting master boot record? */ 1794 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1795 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1796 bp->b_error = EROFS; 1797 goto bad; 1798 } 1799#endif 1800 1801 /* beyond partition? */ 1802 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1803 /* if exactly at end of disk, return an EOF */ 1804 if (bp->b_blkno == maxsz) { 1805 bp->b_resid = bp->b_bcount; 1806 return(0); 1807 } 1808 /* or truncate if part of it fits */ 1809 sz = maxsz - bp->b_blkno; 1810 if (sz <= 0) { 1811 bp->b_error = EINVAL; 1812 goto bad; 1813 } 1814 bp->b_bcount = sz << DEV_BSHIFT; 1815 } 1816 1817 /* calculate cylinder for disksort to order transfers with */ 1818 bp->b_pblkno = bp->b_blkno + p->p_offset; 1819 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1820 return(1); 1821 1822bad: 1823 bp->b_flags |= B_ERROR; 1824 return(-1); 1825} 1826 1827int 1828disk_externalize(int drive, struct sysctl_req *req) 1829{ 1830 return SYSCTL_OUT(req, &drive, sizeof drive); 1831} 1832