machdep.c revision 70861
1/*- 2 * Copyright (c) 1992 Terrence R. Lambert. 3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 38 * $FreeBSD: head/sys/amd64/amd64/machdep.c 70861 2001-01-10 04:43:51Z jake $ 39 */ 40#include "apm.h" 41#include "npx.h" 42#include "opt_atalk.h" 43#include "opt_compat.h" 44#include "opt_cpu.h" 45#include "opt_ddb.h" 46#include "opt_inet.h" 47#include "opt_ipx.h" 48#include "opt_maxmem.h" 49#include "opt_msgbuf.h" 50#include "opt_perfmon.h" 51#include "opt_user_ldt.h" 52#include "opt_userconfig.h" 53 54#include <sys/param.h> 55#include <sys/systm.h> 56#include <sys/sysproto.h> 57#include <sys/signalvar.h> 58#include <sys/ipl.h> 59#include <sys/kernel.h> 60#include <sys/ktr.h> 61#include <sys/linker.h> 62#include <sys/malloc.h> 63#include <sys/mutex.h> 64#include <sys/proc.h> 65#include <sys/bio.h> 66#include <sys/buf.h> 67#include <sys/reboot.h> 68#include <sys/callout.h> 69#include <sys/mbuf.h> 70#include <sys/msgbuf.h> 71#include <sys/sysent.h> 72#include <sys/sysctl.h> 73#include <sys/vmmeter.h> 74#include <sys/bus.h> 75#include <sys/eventhandler.h> 76 77#include <vm/vm.h> 78#include <vm/vm_param.h> 79#include <sys/lock.h> 80#include <vm/vm_kern.h> 81#include <vm/vm_object.h> 82#include <vm/vm_page.h> 83#include <vm/vm_map.h> 84#include <vm/vm_pager.h> 85#include <vm/vm_extern.h> 86 87#include <sys/user.h> 88#include <sys/exec.h> 89#include <sys/cons.h> 90 91#include <ddb/ddb.h> 92 93#include <net/netisr.h> 94 95#include <machine/cpu.h> 96#include <machine/cputypes.h> 97#include <machine/reg.h> 98#include <machine/clock.h> 99#include <machine/specialreg.h> 100#include <machine/bootinfo.h> 101#include <machine/md_var.h> 102#include <machine/pc/bios.h> 103#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 104#include <machine/globaldata.h> 105#include <machine/globals.h> 106#ifdef SMP 107#include <machine/smp.h> 108#endif 109#ifdef PERFMON 110#include <machine/perfmon.h> 111#endif 112 113#ifdef OLD_BUS_ARCH 114#include <i386/isa/isa_device.h> 115#endif 116#include <i386/isa/icu.h> 117#include <i386/isa/intr_machdep.h> 118#include <isa/rtc.h> 119#include <machine/vm86.h> 120#include <sys/ptrace.h> 121#include <machine/sigframe.h> 122 123extern void init386 __P((int first)); 124extern void dblfault_handler __P((void)); 125 126extern void printcpuinfo(void); /* XXX header file */ 127extern void earlysetcpuclass(void); /* same header file */ 128extern void finishidentcpu(void); 129extern void panicifcpuunsupported(void); 130extern void initializecpu(void); 131 132#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 133#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 134 135static void cpu_startup __P((void *)); 136SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 137 138int _udatasel, _ucodesel; 139u_int atdevbase; 140 141#if defined(SWTCH_OPTIM_STATS) 142extern int swtch_optim_stats; 143SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 144 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 145SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 146 CTLFLAG_RD, &tlb_flush_count, 0, ""); 147#endif 148 149#ifdef PC98 150static int ispc98 = 1; 151#else 152static int ispc98 = 0; 153#endif 154SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 155 156int physmem = 0; 157int cold = 1; 158 159static void osendsig __P((sig_t catcher, int sig, sigset_t *mask, u_long code)); 160 161static int 162sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 163{ 164 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 165 return (error); 166} 167 168SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 169 0, 0, sysctl_hw_physmem, "I", ""); 170 171static int 172sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 173{ 174 int error = sysctl_handle_int(oidp, 0, 175 ctob(physmem - cnt.v_wire_count), req); 176 return (error); 177} 178 179SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 180 0, 0, sysctl_hw_usermem, "I", ""); 181 182static int 183sysctl_hw_availpages(SYSCTL_HANDLER_ARGS) 184{ 185 int error = sysctl_handle_int(oidp, 0, 186 i386_btop(avail_end - avail_start), req); 187 return (error); 188} 189 190SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 191 0, 0, sysctl_hw_availpages, "I", ""); 192 193static int 194sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS) 195{ 196 int error; 197 198 /* Unwind the buffer, so that it's linear (possibly starting with 199 * some initial nulls). 200 */ 201 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 202 msgbufp->msg_size-msgbufp->msg_bufr,req); 203 if(error) return(error); 204 if(msgbufp->msg_bufr>0) { 205 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 206 msgbufp->msg_bufr,req); 207 } 208 return(error); 209} 210 211SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 212 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 213 214static int msgbuf_clear; 215 216static int 217sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS) 218{ 219 int error; 220 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 221 req); 222 if (!error && req->newptr) { 223 /* Clear the buffer and reset write pointer */ 224 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 225 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 226 msgbuf_clear=0; 227 } 228 return (error); 229} 230 231SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 232 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 233 "Clear kernel message buffer"); 234 235int bootverbose = 0, Maxmem = 0; 236long dumplo; 237 238vm_offset_t phys_avail[10]; 239 240/* must be 2 less so 0 0 can signal end of chunks */ 241#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 242 243static vm_offset_t buffer_sva, buffer_eva; 244vm_offset_t clean_sva, clean_eva; 245static vm_offset_t pager_sva, pager_eva; 246static struct trapframe proc0_tf; 247#ifndef SMP 248static struct globaldata __globaldata; 249#endif 250 251struct cpuhead cpuhead; 252 253MUTEX_DECLARE(,sched_lock); 254MUTEX_DECLARE(,Giant); 255 256static void 257cpu_startup(dummy) 258 void *dummy; 259{ 260 register unsigned i; 261 register caddr_t v; 262 vm_offset_t maxaddr; 263 vm_size_t size = 0; 264 int firstaddr; 265 vm_offset_t minaddr; 266 int physmem_est; 267 268 if (boothowto & RB_VERBOSE) 269 bootverbose++; 270 271 /* 272 * Good {morning,afternoon,evening,night}. 273 */ 274 printf("%s", version); 275 earlysetcpuclass(); 276 startrtclock(); 277 printcpuinfo(); 278 panicifcpuunsupported(); 279#ifdef PERFMON 280 perfmon_init(); 281#endif 282 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 283 /* 284 * Display any holes after the first chunk of extended memory. 285 */ 286 if (bootverbose) { 287 int indx; 288 289 printf("Physical memory chunk(s):\n"); 290 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 291 unsigned int size1 = phys_avail[indx + 1] - phys_avail[indx]; 292 293 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 294 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 295 size1 / PAGE_SIZE); 296 } 297 } 298 299 /* 300 * Calculate callout wheel size 301 */ 302 for (callwheelsize = 1, callwheelbits = 0; 303 callwheelsize < ncallout; 304 callwheelsize <<= 1, ++callwheelbits) 305 ; 306 callwheelmask = callwheelsize - 1; 307 308 /* 309 * Allocate space for system data structures. 310 * The first available kernel virtual address is in "v". 311 * As pages of kernel virtual memory are allocated, "v" is incremented. 312 * As pages of memory are allocated and cleared, 313 * "firstaddr" is incremented. 314 * An index into the kernel page table corresponding to the 315 * virtual memory address maintained in "v" is kept in "mapaddr". 316 */ 317 318 /* 319 * Make two passes. The first pass calculates how much memory is 320 * needed and allocates it. The second pass assigns virtual 321 * addresses to the various data structures. 322 */ 323 firstaddr = 0; 324again: 325 v = (caddr_t)firstaddr; 326 327#define valloc(name, type, num) \ 328 (name) = (type *)v; v = (caddr_t)((name)+(num)) 329#define valloclim(name, type, num, lim) \ 330 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 331 332 valloc(callout, struct callout, ncallout); 333 valloc(callwheel, struct callout_tailq, callwheelsize); 334 335 /* 336 * Discount the physical memory larger than the size of kernel_map 337 * to avoid eating up all of KVA space. 338 */ 339 if (kernel_map->first_free == NULL) { 340 printf("Warning: no free entries in kernel_map.\n"); 341 physmem_est = physmem; 342 } else 343 physmem_est = min(physmem, kernel_map->max_offset - kernel_map->min_offset); 344 345 /* 346 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE. 347 * For the first 64MB of ram nominally allocate sufficient buffers to 348 * cover 1/4 of our ram. Beyond the first 64MB allocate additional 349 * buffers to cover 1/20 of our ram over 64MB. 350 * 351 * factor represents the 1/4 x ram conversion. 352 */ 353 if (nbuf == 0) { 354 int factor = 4 * BKVASIZE / PAGE_SIZE; 355 356 nbuf = 50; 357 if (physmem_est > 1024) 358 nbuf += min((physmem_est - 1024) / factor, 16384 / factor); 359 if (physmem_est > 16384) 360 nbuf += (physmem_est - 16384) * 2 / (factor * 5); 361 } 362 363 /* 364 * Do not allow the buffer_map to be more then 1/2 the size of the 365 * kernel_map. 366 */ 367 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) / 368 (BKVASIZE * 2)) { 369 nbuf = (kernel_map->max_offset - kernel_map->min_offset) / 370 (BKVASIZE * 2); 371 printf("Warning: nbufs capped at %d\n", nbuf); 372 } 373 374 nswbuf = max(min(nbuf/4, 256), 16); 375 376 valloc(swbuf, struct buf, nswbuf); 377 valloc(buf, struct buf, nbuf); 378 v = bufhashinit(v); 379 380 /* 381 * End of first pass, size has been calculated so allocate memory 382 */ 383 if (firstaddr == 0) { 384 size = (vm_size_t)(v - firstaddr); 385 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 386 if (firstaddr == 0) 387 panic("startup: no room for tables"); 388 goto again; 389 } 390 391 /* 392 * End of second pass, addresses have been assigned 393 */ 394 if ((vm_size_t)(v - firstaddr) != size) 395 panic("startup: table size inconsistency"); 396 397 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 398 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 399 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 400 (nbuf*BKVASIZE)); 401 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 402 (nswbuf*MAXPHYS) + pager_map_size); 403 pager_map->system_map = 1; 404 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 405 (16*(ARG_MAX+(PAGE_SIZE*3)))); 406 407 /* 408 * XXX: Mbuf system machine-specific initializations should 409 * go here, if anywhere. 410 */ 411 412 /* 413 * Initialize callouts 414 */ 415 SLIST_INIT(&callfree); 416 for (i = 0; i < ncallout; i++) { 417 callout_init(&callout[i], 0); 418 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 419 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 420 } 421 422 for (i = 0; i < callwheelsize; i++) { 423 TAILQ_INIT(&callwheel[i]); 424 } 425 426 mtx_init(&callout_lock, "callout", MTX_SPIN); 427 428#if defined(USERCONFIG) 429 userconfig(); 430 cninit(); /* the preferred console may have changed */ 431#endif 432 433 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 434 ptoa(cnt.v_free_count) / 1024); 435 436 /* 437 * Set up buffers, so they can be used to read disk labels. 438 */ 439 bufinit(); 440 vm_pager_bufferinit(); 441 442 SLIST_INIT(&cpuhead); 443 SLIST_INSERT_HEAD(&cpuhead, GLOBALDATA, gd_allcpu); 444 445 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_COLD); 446 447#ifdef SMP 448 /* 449 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 450 */ 451 mp_start(); /* fire up the APs and APICs */ 452 mp_announce(); 453#endif /* SMP */ 454 cpu_setregs(); 455} 456 457/* 458 * Send an interrupt to process. 459 * 460 * Stack is set up to allow sigcode stored 461 * at top to call routine, followed by kcall 462 * to sigreturn routine below. After sigreturn 463 * resets the signal mask, the stack, and the 464 * frame pointer, it returns to the user 465 * specified pc, psl. 466 */ 467static void 468osendsig(catcher, sig, mask, code) 469 sig_t catcher; 470 int sig; 471 sigset_t *mask; 472 u_long code; 473{ 474 struct osigframe sf; 475 struct osigframe *fp; 476 struct proc *p; 477 struct sigacts *psp; 478 struct trapframe *regs; 479 int oonstack; 480 481 p = curproc; 482 psp = p->p_sigacts; 483 regs = p->p_md.md_regs; 484 oonstack = sigonstack(regs->tf_esp); 485 486 /* Allocate and validate space for the signal handler context. */ 487 if ((p->p_flag & P_ALTSTACK) && !oonstack && 488 SIGISMEMBER(psp->ps_sigonstack, sig)) { 489 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 490 p->p_sigstk.ss_size - sizeof(struct osigframe)); 491#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 492 p->p_sigstk.ss_flags |= SS_ONSTACK; 493#endif 494 } else 495 fp = (struct osigframe *)regs->tf_esp - 1; 496 497 /* 498 * grow_stack() will return 0 if *fp does not fit inside the stack 499 * and the stack can not be grown. 500 * useracc() will return FALSE if access is denied. 501 */ 502 if (grow_stack(p, (int)fp) == 0 || 503 !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 504 /* 505 * Process has trashed its stack; give it an illegal 506 * instruction to halt it in its tracks. 507 */ 508 SIGACTION(p, SIGILL) = SIG_DFL; 509 SIGDELSET(p->p_sigignore, SIGILL); 510 SIGDELSET(p->p_sigcatch, SIGILL); 511 SIGDELSET(p->p_sigmask, SIGILL); 512 psignal(p, SIGILL); 513 return; 514 } 515 516 /* Translate the signal if appropriate. */ 517 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 518 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 519 520 /* Build the argument list for the signal handler. */ 521 sf.sf_signum = sig; 522 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 523 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 524 /* Signal handler installed with SA_SIGINFO. */ 525 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 526 sf.sf_siginfo.si_signo = sig; 527 sf.sf_siginfo.si_code = code; 528 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 529 } else { 530 /* Old FreeBSD-style arguments. */ 531 sf.sf_arg2 = code; 532 sf.sf_addr = regs->tf_err; 533 sf.sf_ahu.sf_handler = catcher; 534 } 535 536 /* Save most if not all of trap frame. */ 537 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 538 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 539 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 540 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 541 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 542 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 543 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 544 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 545 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 546 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 547 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 548 sf.sf_siginfo.si_sc.sc_gs = rgs(); 549 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 550 551 /* Build the signal context to be used by osigreturn(). */ 552 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 553 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 554 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 555 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 556 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 557 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 558 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 559 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 560 561 /* 562 * If we're a vm86 process, we want to save the segment registers. 563 * We also change eflags to be our emulated eflags, not the actual 564 * eflags. 565 */ 566 if (regs->tf_eflags & PSL_VM) { 567 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 568 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 569 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 570 571 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 572 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 573 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 574 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 575 576 if (vm86->vm86_has_vme == 0) 577 sf.sf_siginfo.si_sc.sc_ps = 578 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 579 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 580 581 /* See sendsig() for comments. */ 582 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 583 } 584 585 /* Copy the sigframe out to the user's stack. */ 586 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 587 /* 588 * Something is wrong with the stack pointer. 589 * ...Kill the process. 590 */ 591 sigexit(p, SIGILL); 592 } 593 594 regs->tf_esp = (int)fp; 595 regs->tf_eip = PS_STRINGS - szosigcode; 596 regs->tf_cs = _ucodesel; 597 regs->tf_ds = _udatasel; 598 regs->tf_es = _udatasel; 599 regs->tf_fs = _udatasel; 600 load_gs(_udatasel); 601 regs->tf_ss = _udatasel; 602} 603 604void 605sendsig(catcher, sig, mask, code) 606 sig_t catcher; 607 int sig; 608 sigset_t *mask; 609 u_long code; 610{ 611 struct sigframe sf; 612 struct proc *p; 613 struct sigacts *psp; 614 struct trapframe *regs; 615 struct sigframe *sfp; 616 int oonstack; 617 618 p = curproc; 619 psp = p->p_sigacts; 620 if (SIGISMEMBER(psp->ps_osigset, sig)) { 621 osendsig(catcher, sig, mask, code); 622 return; 623 } 624 regs = p->p_md.md_regs; 625 oonstack = sigonstack(regs->tf_esp); 626 627 /* Save user context. */ 628 bzero(&sf, sizeof(sf)); 629 sf.sf_uc.uc_sigmask = *mask; 630 sf.sf_uc.uc_stack = p->p_sigstk; 631 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 632 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 633 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 634 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 635 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 636 637 /* Allocate and validate space for the signal handler context. */ 638 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 639 SIGISMEMBER(psp->ps_sigonstack, sig)) { 640 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 641 p->p_sigstk.ss_size - sizeof(struct sigframe)); 642#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 643 p->p_sigstk.ss_flags |= SS_ONSTACK; 644#endif 645 } else 646 sfp = (struct sigframe *)regs->tf_esp - 1; 647 648 /* 649 * grow_stack() will return 0 if *sfp does not fit inside the stack 650 * and the stack can not be grown. 651 * useracc() will return FALSE if access is denied. 652 */ 653 if (grow_stack(p, (int)sfp) == 0 || 654 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 655 /* 656 * Process has trashed its stack; give it an illegal 657 * instruction to halt it in its tracks. 658 */ 659#ifdef DEBUG 660 printf("process %d has trashed its stack\n", p->p_pid); 661#endif 662 SIGACTION(p, SIGILL) = SIG_DFL; 663 SIGDELSET(p->p_sigignore, SIGILL); 664 SIGDELSET(p->p_sigcatch, SIGILL); 665 SIGDELSET(p->p_sigmask, SIGILL); 666 psignal(p, SIGILL); 667 return; 668 } 669 670 /* Translate the signal if appropriate. */ 671 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 672 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 673 674 /* Build the argument list for the signal handler. */ 675 sf.sf_signum = sig; 676 sf.sf_ucontext = (register_t)&sfp->sf_uc; 677 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 678 /* Signal handler installed with SA_SIGINFO. */ 679 sf.sf_siginfo = (register_t)&sfp->sf_si; 680 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 681 682 /* Fill siginfo structure. */ 683 sf.sf_si.si_signo = sig; 684 sf.sf_si.si_code = code; 685 sf.sf_si.si_addr = (void *)regs->tf_err; 686 } else { 687 /* Old FreeBSD-style arguments. */ 688 sf.sf_siginfo = code; 689 sf.sf_addr = regs->tf_err; 690 sf.sf_ahu.sf_handler = catcher; 691 } 692 693 /* 694 * If we're a vm86 process, we want to save the segment registers. 695 * We also change eflags to be our emulated eflags, not the actual 696 * eflags. 697 */ 698 if (regs->tf_eflags & PSL_VM) { 699 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 700 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 701 702 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 703 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 704 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 705 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 706 707 if (vm86->vm86_has_vme == 0) 708 sf.sf_uc.uc_mcontext.mc_eflags = 709 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 710 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 711 712 /* 713 * We should never have PSL_T set when returning from vm86 714 * mode. It may be set here if we deliver a signal before 715 * getting to vm86 mode, so turn it off. 716 * 717 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 718 * syscalls made by the signal handler. This just avoids 719 * wasting time for our lazy fixup of such faults. PSL_NT 720 * does nothing in vm86 mode, but vm86 programs can set it 721 * almost legitimately in probes for old cpu types. 722 */ 723 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 724 } 725 726 /* Copy the sigframe out to the user's stack. */ 727 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 728 /* 729 * Something is wrong with the stack pointer. 730 * ...Kill the process. 731 */ 732 sigexit(p, SIGILL); 733 } 734 735 regs->tf_esp = (int)sfp; 736 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 737 regs->tf_cs = _ucodesel; 738 regs->tf_ds = _udatasel; 739 regs->tf_es = _udatasel; 740 regs->tf_fs = _udatasel; 741 load_gs(_udatasel); 742 regs->tf_ss = _udatasel; 743} 744 745/* 746 * System call to cleanup state after a signal 747 * has been taken. Reset signal mask and 748 * stack state from context left by sendsig (above). 749 * Return to previous pc and psl as specified by 750 * context left by sendsig. Check carefully to 751 * make sure that the user has not modified the 752 * state to gain improper privileges. 753 */ 754int 755osigreturn(p, uap) 756 struct proc *p; 757 struct osigreturn_args /* { 758 struct osigcontext *sigcntxp; 759 } */ *uap; 760{ 761 struct trapframe *regs; 762 struct osigcontext *scp; 763 int eflags; 764 765 regs = p->p_md.md_regs; 766 scp = uap->sigcntxp; 767 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 768 return (EFAULT); 769 eflags = scp->sc_ps; 770 if (eflags & PSL_VM) { 771 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 772 struct vm86_kernel *vm86; 773 774 /* 775 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 776 * set up the vm86 area, and we can't enter vm86 mode. 777 */ 778 if (p->p_addr->u_pcb.pcb_ext == 0) 779 return (EINVAL); 780 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 781 if (vm86->vm86_inited == 0) 782 return (EINVAL); 783 784 /* Go back to user mode if both flags are set. */ 785 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 786 trapsignal(p, SIGBUS, 0); 787 788 if (vm86->vm86_has_vme) { 789 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 790 (eflags & VME_USERCHANGE) | PSL_VM; 791 } else { 792 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 793 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 794 } 795 tf->tf_vm86_ds = scp->sc_ds; 796 tf->tf_vm86_es = scp->sc_es; 797 tf->tf_vm86_fs = scp->sc_fs; 798 tf->tf_vm86_gs = scp->sc_gs; 799 tf->tf_ds = _udatasel; 800 tf->tf_es = _udatasel; 801 tf->tf_fs = _udatasel; 802 } else { 803 /* 804 * Don't allow users to change privileged or reserved flags. 805 */ 806 /* 807 * XXX do allow users to change the privileged flag PSL_RF. 808 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 809 * should sometimes set it there too. tf_eflags is kept in 810 * the signal context during signal handling and there is no 811 * other place to remember it, so the PSL_RF bit may be 812 * corrupted by the signal handler without us knowing. 813 * Corruption of the PSL_RF bit at worst causes one more or 814 * one less debugger trap, so allowing it is fairly harmless. 815 */ 816 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 817 return (EINVAL); 818 } 819 820 /* 821 * Don't allow users to load a valid privileged %cs. Let the 822 * hardware check for invalid selectors, excess privilege in 823 * other selectors, invalid %eip's and invalid %esp's. 824 */ 825 if (!CS_SECURE(scp->sc_cs)) { 826 trapsignal(p, SIGBUS, T_PROTFLT); 827 return (EINVAL); 828 } 829 regs->tf_ds = scp->sc_ds; 830 regs->tf_es = scp->sc_es; 831 regs->tf_fs = scp->sc_fs; 832 } 833 834 /* Restore remaining registers. */ 835 regs->tf_eax = scp->sc_eax; 836 regs->tf_ebx = scp->sc_ebx; 837 regs->tf_ecx = scp->sc_ecx; 838 regs->tf_edx = scp->sc_edx; 839 regs->tf_esi = scp->sc_esi; 840 regs->tf_edi = scp->sc_edi; 841 regs->tf_cs = scp->sc_cs; 842 regs->tf_ss = scp->sc_ss; 843 regs->tf_isp = scp->sc_isp; 844 845#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 846 if (scp->sc_onstack & 1) 847 p->p_sigstk.ss_flags |= SS_ONSTACK; 848 else 849 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 850#endif 851 852 SIGSETOLD(p->p_sigmask, scp->sc_mask); 853 SIG_CANTMASK(p->p_sigmask); 854 regs->tf_ebp = scp->sc_fp; 855 regs->tf_esp = scp->sc_sp; 856 regs->tf_eip = scp->sc_pc; 857 regs->tf_eflags = eflags; 858 return (EJUSTRETURN); 859} 860 861int 862sigreturn(p, uap) 863 struct proc *p; 864 struct sigreturn_args /* { 865 ucontext_t *sigcntxp; 866 } */ *uap; 867{ 868 struct trapframe *regs; 869 ucontext_t *ucp; 870 int cs, eflags; 871 872 ucp = uap->sigcntxp; 873 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 874 return (EFAULT); 875 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 876 return (osigreturn(p, (struct osigreturn_args *)uap)); 877 878 /* 879 * Since ucp is not an osigcontext but a ucontext_t, we have to 880 * check again if all of it is accessible. A ucontext_t is 881 * much larger, so instead of just checking for the pointer 882 * being valid for the size of an osigcontext, now check for 883 * it being valid for a whole, new-style ucontext_t. 884 */ 885 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 886 return (EFAULT); 887 888 regs = p->p_md.md_regs; 889 eflags = ucp->uc_mcontext.mc_eflags; 890 if (eflags & PSL_VM) { 891 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 892 struct vm86_kernel *vm86; 893 894 /* 895 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 896 * set up the vm86 area, and we can't enter vm86 mode. 897 */ 898 if (p->p_addr->u_pcb.pcb_ext == 0) 899 return (EINVAL); 900 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 901 if (vm86->vm86_inited == 0) 902 return (EINVAL); 903 904 /* Go back to user mode if both flags are set. */ 905 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 906 trapsignal(p, SIGBUS, 0); 907 908 if (vm86->vm86_has_vme) { 909 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 910 (eflags & VME_USERCHANGE) | PSL_VM; 911 } else { 912 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 913 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 914 } 915 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 916 tf->tf_eflags = eflags; 917 tf->tf_vm86_ds = tf->tf_ds; 918 tf->tf_vm86_es = tf->tf_es; 919 tf->tf_vm86_fs = tf->tf_fs; 920 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 921 tf->tf_ds = _udatasel; 922 tf->tf_es = _udatasel; 923 tf->tf_fs = _udatasel; 924 } else { 925 /* 926 * Don't allow users to change privileged or reserved flags. 927 */ 928 /* 929 * XXX do allow users to change the privileged flag PSL_RF. 930 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 931 * should sometimes set it there too. tf_eflags is kept in 932 * the signal context during signal handling and there is no 933 * other place to remember it, so the PSL_RF bit may be 934 * corrupted by the signal handler without us knowing. 935 * Corruption of the PSL_RF bit at worst causes one more or 936 * one less debugger trap, so allowing it is fairly harmless. 937 */ 938 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 939 printf("sigreturn: eflags = 0x%x\n", eflags); 940 return (EINVAL); 941 } 942 943 /* 944 * Don't allow users to load a valid privileged %cs. Let the 945 * hardware check for invalid selectors, excess privilege in 946 * other selectors, invalid %eip's and invalid %esp's. 947 */ 948 cs = ucp->uc_mcontext.mc_cs; 949 if (!CS_SECURE(cs)) { 950 printf("sigreturn: cs = 0x%x\n", cs); 951 trapsignal(p, SIGBUS, T_PROTFLT); 952 return (EINVAL); 953 } 954 955 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 956 } 957 958#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 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#endif 964 965 p->p_sigmask = ucp->uc_sigmask; 966 SIG_CANTMASK(p->p_sigmask); 967 return (EJUSTRETURN); 968} 969 970/* 971 * Machine dependent boot() routine 972 * 973 * I haven't seen anything to put here yet 974 * Possibly some stuff might be grafted back here from boot() 975 */ 976void 977cpu_boot(int howto) 978{ 979} 980 981/* 982 * Shutdown the CPU as much as possible 983 */ 984void 985cpu_halt(void) 986{ 987 for (;;) 988 __asm__ ("hlt"); 989} 990 991/* 992 * Hook to idle the CPU when possible. This currently only works in 993 * the !SMP case, as there is no clean way to ensure that a CPU will be 994 * woken when there is work available for it. 995 */ 996static int cpu_idle_hlt = 1; 997SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 998 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 999 1000/* 1001 * Note that we have to be careful here to avoid a race between checking 1002 * procrunnable() and actually halting. If we don't do this, we may waste 1003 * the time between calling hlt and the next interrupt even though there 1004 * is a runnable process. 1005 */ 1006void 1007cpu_idle(void) 1008{ 1009#ifndef SMP 1010 if (cpu_idle_hlt) { 1011 disable_intr(); 1012 if (procrunnable()) 1013 enable_intr(); 1014 else { 1015 enable_intr(); 1016 __asm __volatile("hlt"); 1017 } 1018 } 1019#endif 1020} 1021 1022/* 1023 * Clear registers on exec 1024 */ 1025void 1026setregs(p, entry, stack, ps_strings) 1027 struct proc *p; 1028 u_long entry; 1029 u_long stack; 1030 u_long ps_strings; 1031{ 1032 struct trapframe *regs = p->p_md.md_regs; 1033 struct pcb *pcb = &p->p_addr->u_pcb; 1034 1035#ifdef USER_LDT 1036 /* was i386_user_cleanup() in NetBSD */ 1037 user_ldt_free(pcb); 1038#endif 1039 1040 bzero((char *)regs, sizeof(struct trapframe)); 1041 regs->tf_eip = entry; 1042 regs->tf_esp = stack; 1043 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1044 regs->tf_ss = _udatasel; 1045 regs->tf_ds = _udatasel; 1046 regs->tf_es = _udatasel; 1047 regs->tf_fs = _udatasel; 1048 regs->tf_cs = _ucodesel; 1049 1050 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1051 regs->tf_ebx = ps_strings; 1052 1053 /* reset %gs as well */ 1054 if (pcb == PCPU_GET(curpcb)) 1055 load_gs(_udatasel); 1056 else 1057 pcb->pcb_gs = _udatasel; 1058 1059 /* 1060 * Reset the hardware debug registers if they were in use. 1061 * They won't have any meaning for the newly exec'd process. 1062 */ 1063 if (pcb->pcb_flags & PCB_DBREGS) { 1064 pcb->pcb_dr0 = 0; 1065 pcb->pcb_dr1 = 0; 1066 pcb->pcb_dr2 = 0; 1067 pcb->pcb_dr3 = 0; 1068 pcb->pcb_dr6 = 0; 1069 pcb->pcb_dr7 = 0; 1070 if (pcb == PCPU_GET(curpcb)) { 1071 /* 1072 * Clear the debug registers on the running 1073 * CPU, otherwise they will end up affecting 1074 * the next process we switch to. 1075 */ 1076 reset_dbregs(); 1077 } 1078 pcb->pcb_flags &= ~PCB_DBREGS; 1079 } 1080 1081 /* 1082 * Initialize the math emulator (if any) for the current process. 1083 * Actually, just clear the bit that says that the emulator has 1084 * been initialized. Initialization is delayed until the process 1085 * traps to the emulator (if it is done at all) mainly because 1086 * emulators don't provide an entry point for initialization. 1087 */ 1088 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1089 1090 /* 1091 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1092 * for why fwait must be trapped at least if there is an npx or an 1093 * emulator). This is mainly to handle the case where npx0 is not 1094 * configured, since the npx routines normally set up the trap 1095 * otherwise. It should be done only at boot time, but doing it 1096 * here allows modifying `npx_exists' for testing the emulator on 1097 * systems with an npx. 1098 */ 1099 load_cr0(rcr0() | CR0_MP | CR0_TS); 1100 1101#if NNPX > 0 1102 /* Initialize the npx (if any) for the current process. */ 1103 npxinit(__INITIAL_NPXCW__); 1104#endif 1105 1106 /* 1107 * XXX - Linux emulator 1108 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1109 * on it. 1110 */ 1111 p->p_retval[1] = 0; 1112} 1113 1114void 1115cpu_setregs(void) 1116{ 1117 unsigned int cr0; 1118 1119 cr0 = rcr0(); 1120 cr0 |= CR0_NE; /* Done by npxinit() */ 1121 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 1122#ifdef I386_CPU 1123 if (cpu_class != CPUCLASS_386) 1124#endif 1125 cr0 |= CR0_WP | CR0_AM; 1126 load_cr0(cr0); 1127 load_gs(_udatasel); 1128} 1129 1130static int 1131sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1132{ 1133 int error; 1134 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1135 req); 1136 if (!error && req->newptr) 1137 resettodr(); 1138 return (error); 1139} 1140 1141SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1142 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1143 1144SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1145 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1146 1147SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1148 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1149 1150SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1151 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1152 1153/* 1154 * Initialize 386 and configure to run kernel 1155 */ 1156 1157/* 1158 * Initialize segments & interrupt table 1159 */ 1160 1161int _default_ldt; 1162union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1163static struct gate_descriptor idt0[NIDT]; 1164struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1165union descriptor ldt[NLDT]; /* local descriptor table */ 1166#ifdef SMP 1167/* table descriptors - used to load tables by microp */ 1168struct region_descriptor r_gdt, r_idt; 1169#endif 1170 1171int private_tss; /* flag indicating private tss */ 1172 1173#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1174extern int has_f00f_bug; 1175#endif 1176 1177static struct i386tss dblfault_tss; 1178static char dblfault_stack[PAGE_SIZE]; 1179 1180extern struct user *proc0paddr; 1181 1182 1183/* software prototypes -- in more palatable form */ 1184struct soft_segment_descriptor gdt_segs[] = { 1185/* GNULL_SEL 0 Null Descriptor */ 1186{ 0x0, /* segment base address */ 1187 0x0, /* length */ 1188 0, /* segment type */ 1189 0, /* segment descriptor priority level */ 1190 0, /* segment descriptor present */ 1191 0, 0, 1192 0, /* default 32 vs 16 bit size */ 1193 0 /* limit granularity (byte/page units)*/ }, 1194/* GCODE_SEL 1 Code Descriptor for kernel */ 1195{ 0x0, /* segment base address */ 1196 0xfffff, /* length - all address space */ 1197 SDT_MEMERA, /* segment type */ 1198 0, /* segment descriptor priority level */ 1199 1, /* segment descriptor present */ 1200 0, 0, 1201 1, /* default 32 vs 16 bit size */ 1202 1 /* limit granularity (byte/page units)*/ }, 1203/* GDATA_SEL 2 Data Descriptor for kernel */ 1204{ 0x0, /* segment base address */ 1205 0xfffff, /* length - all address space */ 1206 SDT_MEMRWA, /* segment type */ 1207 0, /* segment descriptor priority level */ 1208 1, /* segment descriptor present */ 1209 0, 0, 1210 1, /* default 32 vs 16 bit size */ 1211 1 /* limit granularity (byte/page units)*/ }, 1212/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1213{ 0x0, /* segment base address */ 1214 0xfffff, /* length - all address space */ 1215 SDT_MEMRWA, /* segment type */ 1216 0, /* segment descriptor priority level */ 1217 1, /* segment descriptor present */ 1218 0, 0, 1219 1, /* default 32 vs 16 bit size */ 1220 1 /* limit granularity (byte/page units)*/ }, 1221/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1222{ 1223 0x0, /* segment base address */ 1224 sizeof(struct i386tss)-1,/* length - all address space */ 1225 SDT_SYS386TSS, /* segment type */ 1226 0, /* segment descriptor priority level */ 1227 1, /* segment descriptor present */ 1228 0, 0, 1229 0, /* unused - default 32 vs 16 bit size */ 1230 0 /* limit granularity (byte/page units)*/ }, 1231/* GLDT_SEL 5 LDT Descriptor */ 1232{ (int) ldt, /* segment base address */ 1233 sizeof(ldt)-1, /* length - all address space */ 1234 SDT_SYSLDT, /* segment type */ 1235 SEL_UPL, /* segment descriptor priority level */ 1236 1, /* segment descriptor present */ 1237 0, 0, 1238 0, /* unused - default 32 vs 16 bit size */ 1239 0 /* limit granularity (byte/page units)*/ }, 1240/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1241{ (int) ldt, /* segment base address */ 1242 (512 * sizeof(union descriptor)-1), /* length */ 1243 SDT_SYSLDT, /* segment type */ 1244 0, /* segment descriptor priority level */ 1245 1, /* segment descriptor present */ 1246 0, 0, 1247 0, /* unused - default 32 vs 16 bit size */ 1248 0 /* limit granularity (byte/page units)*/ }, 1249/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1250{ 0x0, /* segment base address */ 1251 0x0, /* length - all address space */ 1252 0, /* segment type */ 1253 0, /* segment descriptor priority level */ 1254 0, /* segment descriptor present */ 1255 0, 0, 1256 0, /* default 32 vs 16 bit size */ 1257 0 /* limit granularity (byte/page units)*/ }, 1258/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1259{ 0x400, /* segment base address */ 1260 0xfffff, /* length */ 1261 SDT_MEMRWA, /* segment type */ 1262 0, /* segment descriptor priority level */ 1263 1, /* segment descriptor present */ 1264 0, 0, 1265 1, /* default 32 vs 16 bit size */ 1266 1 /* limit granularity (byte/page units)*/ }, 1267/* GPANIC_SEL 9 Panic Tss Descriptor */ 1268{ (int) &dblfault_tss, /* segment base address */ 1269 sizeof(struct i386tss)-1,/* length - all address space */ 1270 SDT_SYS386TSS, /* segment type */ 1271 0, /* segment descriptor priority level */ 1272 1, /* segment descriptor present */ 1273 0, 0, 1274 0, /* unused - default 32 vs 16 bit size */ 1275 0 /* limit granularity (byte/page units)*/ }, 1276/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1277{ 0, /* segment base address (overwritten) */ 1278 0xfffff, /* length */ 1279 SDT_MEMERA, /* segment type */ 1280 0, /* segment descriptor priority level */ 1281 1, /* segment descriptor present */ 1282 0, 0, 1283 0, /* default 32 vs 16 bit size */ 1284 1 /* limit granularity (byte/page units)*/ }, 1285/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1286{ 0, /* segment base address (overwritten) */ 1287 0xfffff, /* length */ 1288 SDT_MEMERA, /* segment type */ 1289 0, /* segment descriptor priority level */ 1290 1, /* segment descriptor present */ 1291 0, 0, 1292 0, /* default 32 vs 16 bit size */ 1293 1 /* limit granularity (byte/page units)*/ }, 1294/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1295{ 0, /* segment base address (overwritten) */ 1296 0xfffff, /* length */ 1297 SDT_MEMRWA, /* segment type */ 1298 0, /* segment descriptor priority level */ 1299 1, /* segment descriptor present */ 1300 0, 0, 1301 1, /* default 32 vs 16 bit size */ 1302 1 /* limit granularity (byte/page units)*/ }, 1303/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1304{ 0, /* segment base address (overwritten) */ 1305 0xfffff, /* length */ 1306 SDT_MEMRWA, /* segment type */ 1307 0, /* segment descriptor priority level */ 1308 1, /* segment descriptor present */ 1309 0, 0, 1310 0, /* default 32 vs 16 bit size */ 1311 1 /* limit granularity (byte/page units)*/ }, 1312/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1313{ 0, /* segment base address (overwritten) */ 1314 0xfffff, /* length */ 1315 SDT_MEMRWA, /* segment type */ 1316 0, /* segment descriptor priority level */ 1317 1, /* segment descriptor present */ 1318 0, 0, 1319 0, /* default 32 vs 16 bit size */ 1320 1 /* limit granularity (byte/page units)*/ }, 1321}; 1322 1323static struct soft_segment_descriptor ldt_segs[] = { 1324 /* Null Descriptor - overwritten by call gate */ 1325{ 0x0, /* segment base address */ 1326 0x0, /* length - all address space */ 1327 0, /* segment type */ 1328 0, /* segment descriptor priority level */ 1329 0, /* segment descriptor present */ 1330 0, 0, 1331 0, /* default 32 vs 16 bit size */ 1332 0 /* limit granularity (byte/page units)*/ }, 1333 /* Null Descriptor - overwritten by call gate */ 1334{ 0x0, /* segment base address */ 1335 0x0, /* length - all address space */ 1336 0, /* segment type */ 1337 0, /* segment descriptor priority level */ 1338 0, /* segment descriptor present */ 1339 0, 0, 1340 0, /* default 32 vs 16 bit size */ 1341 0 /* limit granularity (byte/page units)*/ }, 1342 /* Null Descriptor - overwritten by call gate */ 1343{ 0x0, /* segment base address */ 1344 0x0, /* length - all address space */ 1345 0, /* segment type */ 1346 0, /* segment descriptor priority level */ 1347 0, /* segment descriptor present */ 1348 0, 0, 1349 0, /* default 32 vs 16 bit size */ 1350 0 /* limit granularity (byte/page units)*/ }, 1351 /* Code Descriptor for user */ 1352{ 0x0, /* segment base address */ 1353 0xfffff, /* length - all address space */ 1354 SDT_MEMERA, /* segment type */ 1355 SEL_UPL, /* segment descriptor priority level */ 1356 1, /* segment descriptor present */ 1357 0, 0, 1358 1, /* default 32 vs 16 bit size */ 1359 1 /* limit granularity (byte/page units)*/ }, 1360 /* Null Descriptor - overwritten by call gate */ 1361{ 0x0, /* segment base address */ 1362 0x0, /* length - all address space */ 1363 0, /* segment type */ 1364 0, /* segment descriptor priority level */ 1365 0, /* segment descriptor present */ 1366 0, 0, 1367 0, /* default 32 vs 16 bit size */ 1368 0 /* limit granularity (byte/page units)*/ }, 1369 /* Data Descriptor for user */ 1370{ 0x0, /* segment base address */ 1371 0xfffff, /* length - all address space */ 1372 SDT_MEMRWA, /* segment type */ 1373 SEL_UPL, /* segment descriptor priority level */ 1374 1, /* segment descriptor present */ 1375 0, 0, 1376 1, /* default 32 vs 16 bit size */ 1377 1 /* limit granularity (byte/page units)*/ }, 1378}; 1379 1380void 1381setidt(idx, func, typ, dpl, selec) 1382 int idx; 1383 inthand_t *func; 1384 int typ; 1385 int dpl; 1386 int selec; 1387{ 1388 struct gate_descriptor *ip; 1389 1390 ip = idt + idx; 1391 ip->gd_looffset = (int)func; 1392 ip->gd_selector = selec; 1393 ip->gd_stkcpy = 0; 1394 ip->gd_xx = 0; 1395 ip->gd_type = typ; 1396 ip->gd_dpl = dpl; 1397 ip->gd_p = 1; 1398 ip->gd_hioffset = ((int)func)>>16 ; 1399} 1400 1401#define IDTVEC(name) __CONCAT(X,name) 1402 1403extern inthand_t 1404 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1405 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1406 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1407 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1408 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1409 1410void 1411sdtossd(sd, ssd) 1412 struct segment_descriptor *sd; 1413 struct soft_segment_descriptor *ssd; 1414{ 1415 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1416 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1417 ssd->ssd_type = sd->sd_type; 1418 ssd->ssd_dpl = sd->sd_dpl; 1419 ssd->ssd_p = sd->sd_p; 1420 ssd->ssd_def32 = sd->sd_def32; 1421 ssd->ssd_gran = sd->sd_gran; 1422} 1423 1424#define PHYSMAP_SIZE (2 * 8) 1425 1426/* 1427 * Populate the (physmap) array with base/bound pairs describing the 1428 * available physical memory in the system, then test this memory and 1429 * build the phys_avail array describing the actually-available memory. 1430 * 1431 * If we cannot accurately determine the physical memory map, then use 1432 * value from the 0xE801 call, and failing that, the RTC. 1433 * 1434 * Total memory size may be set by the kernel environment variable 1435 * hw.physmem or the compile-time define MAXMEM. 1436 */ 1437static void 1438getmemsize(int first) 1439{ 1440 int i, physmap_idx, pa_indx; 1441 u_int basemem, extmem; 1442 struct vm86frame vmf; 1443 struct vm86context vmc; 1444 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1445 pt_entry_t pte; 1446 const char *cp; 1447 struct bios_smap *smap; 1448 1449 bzero(&vmf, sizeof(struct vm86frame)); 1450 bzero(physmap, sizeof(physmap)); 1451 1452 /* 1453 * Perform "base memory" related probes & setup 1454 */ 1455 vm86_intcall(0x12, &vmf); 1456 basemem = vmf.vmf_ax; 1457 if (basemem > 640) { 1458 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1459 basemem); 1460 basemem = 640; 1461 } 1462 1463 /* 1464 * XXX if biosbasemem is now < 640, there is a `hole' 1465 * between the end of base memory and the start of 1466 * ISA memory. The hole may be empty or it may 1467 * contain BIOS code or data. Map it read/write so 1468 * that the BIOS can write to it. (Memory from 0 to 1469 * the physical end of the kernel is mapped read-only 1470 * to begin with and then parts of it are remapped. 1471 * The parts that aren't remapped form holes that 1472 * remain read-only and are unused by the kernel. 1473 * The base memory area is below the physical end of 1474 * the kernel and right now forms a read-only hole. 1475 * The part of it from PAGE_SIZE to 1476 * (trunc_page(biosbasemem * 1024) - 1) will be 1477 * remapped and used by the kernel later.) 1478 * 1479 * This code is similar to the code used in 1480 * pmap_mapdev, but since no memory needs to be 1481 * allocated we simply change the mapping. 1482 */ 1483 for (pa = trunc_page(basemem * 1024); 1484 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1485 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1486 *pte = pa | PG_RW | PG_V; 1487 } 1488 1489 /* 1490 * if basemem != 640, map pages r/w into vm86 page table so 1491 * that the bios can scribble on it. 1492 */ 1493 pte = (pt_entry_t)vm86paddr; 1494 for (i = basemem / 4; i < 160; i++) 1495 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1496 1497 /* 1498 * map page 1 R/W into the kernel page table so we can use it 1499 * as a buffer. The kernel will unmap this page later. 1500 */ 1501 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1502 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1503 1504 /* 1505 * get memory map with INT 15:E820 1506 */ 1507 vmc.npages = 0; 1508 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1509 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1510 1511 physmap_idx = 0; 1512 vmf.vmf_ebx = 0; 1513 do { 1514 vmf.vmf_eax = 0xE820; 1515 vmf.vmf_edx = SMAP_SIG; 1516 vmf.vmf_ecx = sizeof(struct bios_smap); 1517 i = vm86_datacall(0x15, &vmf, &vmc); 1518 if (i || vmf.vmf_eax != SMAP_SIG) 1519 break; 1520 if (boothowto & RB_VERBOSE) 1521 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1522 smap->type, 1523 *(u_int32_t *)((char *)&smap->base + 4), 1524 (u_int32_t)smap->base, 1525 *(u_int32_t *)((char *)&smap->length + 4), 1526 (u_int32_t)smap->length); 1527 1528 if (smap->type != 0x01) 1529 goto next_run; 1530 1531 if (smap->length == 0) 1532 goto next_run; 1533 1534 if (smap->base >= 0xffffffff) { 1535 printf("%uK of memory above 4GB ignored\n", 1536 (u_int)(smap->length / 1024)); 1537 goto next_run; 1538 } 1539 1540 for (i = 0; i <= physmap_idx; i += 2) { 1541 if (smap->base < physmap[i + 1]) { 1542 if (boothowto & RB_VERBOSE) 1543 printf( 1544 "Overlapping or non-montonic memory region, ignoring second region\n"); 1545 goto next_run; 1546 } 1547 } 1548 1549 if (smap->base == physmap[physmap_idx + 1]) { 1550 physmap[physmap_idx + 1] += smap->length; 1551 goto next_run; 1552 } 1553 1554 physmap_idx += 2; 1555 if (physmap_idx == PHYSMAP_SIZE) { 1556 printf( 1557 "Too many segments in the physical address map, giving up\n"); 1558 break; 1559 } 1560 physmap[physmap_idx] = smap->base; 1561 physmap[physmap_idx + 1] = smap->base + smap->length; 1562next_run: 1563 } while (vmf.vmf_ebx != 0); 1564 1565 if (physmap[1] != 0) 1566 goto physmap_done; 1567 1568 /* 1569 * If we failed above, try memory map with INT 15:E801 1570 */ 1571 vmf.vmf_ax = 0xE801; 1572 if (vm86_intcall(0x15, &vmf) == 0) { 1573 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1574 } else { 1575#if 0 1576 vmf.vmf_ah = 0x88; 1577 vm86_intcall(0x15, &vmf); 1578 extmem = vmf.vmf_ax; 1579#else 1580 /* 1581 * Prefer the RTC value for extended memory. 1582 */ 1583 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1584#endif 1585 } 1586 1587 /* 1588 * Special hack for chipsets that still remap the 384k hole when 1589 * there's 16MB of memory - this really confuses people that 1590 * are trying to use bus mastering ISA controllers with the 1591 * "16MB limit"; they only have 16MB, but the remapping puts 1592 * them beyond the limit. 1593 * 1594 * If extended memory is between 15-16MB (16-17MB phys address range), 1595 * chop it to 15MB. 1596 */ 1597 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1598 extmem = 15 * 1024; 1599 1600 physmap[0] = 0; 1601 physmap[1] = basemem * 1024; 1602 physmap_idx = 2; 1603 physmap[physmap_idx] = 0x100000; 1604 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1605 1606physmap_done: 1607 /* 1608 * Now, physmap contains a map of physical memory. 1609 */ 1610 1611#ifdef SMP 1612 /* make hole for AP bootstrap code */ 1613 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1614 1615 /* look for the MP hardware - needed for apic addresses */ 1616 mp_probe(); 1617#endif 1618 1619 /* 1620 * Maxmem isn't the "maximum memory", it's one larger than the 1621 * highest page of the physical address space. It should be 1622 * called something like "Maxphyspage". We may adjust this 1623 * based on ``hw.physmem'' and the results of the memory test. 1624 */ 1625 Maxmem = atop(physmap[physmap_idx + 1]); 1626 1627#ifdef MAXMEM 1628 Maxmem = MAXMEM / 4; 1629#endif 1630 1631 /* 1632 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1633 * for the appropriate modifiers. This overrides MAXMEM. 1634 */ 1635 if ((cp = getenv("hw.physmem")) != NULL) { 1636 u_int64_t AllowMem, sanity; 1637 char *ep; 1638 1639 sanity = AllowMem = strtouq(cp, &ep, 0); 1640 if ((ep != cp) && (*ep != 0)) { 1641 switch(*ep) { 1642 case 'g': 1643 case 'G': 1644 AllowMem <<= 10; 1645 case 'm': 1646 case 'M': 1647 AllowMem <<= 10; 1648 case 'k': 1649 case 'K': 1650 AllowMem <<= 10; 1651 break; 1652 default: 1653 AllowMem = sanity = 0; 1654 } 1655 if (AllowMem < sanity) 1656 AllowMem = 0; 1657 } 1658 if (AllowMem == 0) 1659 printf("Ignoring invalid memory size of '%s'\n", cp); 1660 else 1661 Maxmem = atop(AllowMem); 1662 } 1663 1664 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1665 (boothowto & RB_VERBOSE)) 1666 printf("Physical memory use set to %uK\n", Maxmem * 4); 1667 1668 /* 1669 * If Maxmem has been increased beyond what the system has detected, 1670 * extend the last memory segment to the new limit. 1671 */ 1672 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1673 physmap[physmap_idx + 1] = ptoa(Maxmem); 1674 1675 /* call pmap initialization to make new kernel address space */ 1676 pmap_bootstrap(first, 0); 1677 1678 /* 1679 * Size up each available chunk of physical memory. 1680 */ 1681 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1682 pa_indx = 0; 1683 phys_avail[pa_indx++] = physmap[0]; 1684 phys_avail[pa_indx] = physmap[0]; 1685#if 0 1686 pte = (pt_entry_t)vtopte(KERNBASE); 1687#else 1688 pte = (pt_entry_t)CMAP1; 1689#endif 1690 1691 /* 1692 * physmap is in bytes, so when converting to page boundaries, 1693 * round up the start address and round down the end address. 1694 */ 1695 for (i = 0; i <= physmap_idx; i += 2) { 1696 vm_offset_t end; 1697 1698 end = ptoa(Maxmem); 1699 if (physmap[i + 1] < end) 1700 end = trunc_page(physmap[i + 1]); 1701 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1702 int tmp, page_bad; 1703#if 0 1704 int *ptr = 0; 1705#else 1706 int *ptr = (int *)CADDR1; 1707#endif 1708 1709 /* 1710 * block out kernel memory as not available. 1711 */ 1712 if (pa >= 0x100000 && pa < first) 1713 continue; 1714 1715 page_bad = FALSE; 1716 1717 /* 1718 * map page into kernel: valid, read/write,non-cacheable 1719 */ 1720 *pte = pa | PG_V | PG_RW | PG_N; 1721 invltlb(); 1722 1723 tmp = *(int *)ptr; 1724 /* 1725 * Test for alternating 1's and 0's 1726 */ 1727 *(volatile int *)ptr = 0xaaaaaaaa; 1728 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1729 page_bad = TRUE; 1730 } 1731 /* 1732 * Test for alternating 0's and 1's 1733 */ 1734 *(volatile int *)ptr = 0x55555555; 1735 if (*(volatile int *)ptr != 0x55555555) { 1736 page_bad = TRUE; 1737 } 1738 /* 1739 * Test for all 1's 1740 */ 1741 *(volatile int *)ptr = 0xffffffff; 1742 if (*(volatile int *)ptr != 0xffffffff) { 1743 page_bad = TRUE; 1744 } 1745 /* 1746 * Test for all 0's 1747 */ 1748 *(volatile int *)ptr = 0x0; 1749 if (*(volatile int *)ptr != 0x0) { 1750 page_bad = TRUE; 1751 } 1752 /* 1753 * Restore original value. 1754 */ 1755 *(int *)ptr = tmp; 1756 1757 /* 1758 * Adjust array of valid/good pages. 1759 */ 1760 if (page_bad == TRUE) { 1761 continue; 1762 } 1763 /* 1764 * If this good page is a continuation of the 1765 * previous set of good pages, then just increase 1766 * the end pointer. Otherwise start a new chunk. 1767 * Note that "end" points one higher than end, 1768 * making the range >= start and < end. 1769 * If we're also doing a speculative memory 1770 * test and we at or past the end, bump up Maxmem 1771 * so that we keep going. The first bad page 1772 * will terminate the loop. 1773 */ 1774 if (phys_avail[pa_indx] == pa) { 1775 phys_avail[pa_indx] += PAGE_SIZE; 1776 } else { 1777 pa_indx++; 1778 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1779 printf("Too many holes in the physical address space, giving up\n"); 1780 pa_indx--; 1781 break; 1782 } 1783 phys_avail[pa_indx++] = pa; /* start */ 1784 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1785 } 1786 physmem++; 1787 } 1788 } 1789 *pte = 0; 1790 invltlb(); 1791 1792 /* 1793 * XXX 1794 * The last chunk must contain at least one page plus the message 1795 * buffer to avoid complicating other code (message buffer address 1796 * calculation, etc.). 1797 */ 1798 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1799 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1800 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1801 phys_avail[pa_indx--] = 0; 1802 phys_avail[pa_indx--] = 0; 1803 } 1804 1805 Maxmem = atop(phys_avail[pa_indx]); 1806 1807 /* Trim off space for the message buffer. */ 1808 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1809 1810 avail_end = phys_avail[pa_indx]; 1811} 1812 1813void 1814init386(first) 1815 int first; 1816{ 1817 int x; 1818 struct gate_descriptor *gdp; 1819 int gsel_tss; 1820#ifndef SMP 1821 /* table descriptors - used to load tables by microp */ 1822 struct region_descriptor r_gdt, r_idt; 1823#endif 1824 int off; 1825 1826 proc0.p_addr = proc0paddr; 1827 1828 atdevbase = ISA_HOLE_START + KERNBASE; 1829 1830 if (bootinfo.bi_modulep) { 1831 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1832 preload_bootstrap_relocate(KERNBASE); 1833 } else { 1834 printf("WARNING: loader(8) metadata is missing!\n"); 1835 } 1836 if (bootinfo.bi_envp) 1837 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1838 1839 /* 1840 * make gdt memory segments, the code segment goes up to end of the 1841 * page with etext in it, the data segment goes to the end of 1842 * the address space 1843 */ 1844 /* 1845 * XXX text protection is temporarily (?) disabled. The limit was 1846 * i386_btop(round_page(etext)) - 1. 1847 */ 1848 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1849 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1850#ifdef SMP 1851 gdt_segs[GPRIV_SEL].ssd_limit = 1852 i386_btop(sizeof(struct privatespace)) - 1; 1853 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1854 gdt_segs[GPROC0_SEL].ssd_base = 1855 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1856 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0].globaldata; 1857#else 1858 gdt_segs[GPRIV_SEL].ssd_limit = 1859 i386_btop(sizeof(struct globaldata)) - 1; 1860 gdt_segs[GPRIV_SEL].ssd_base = (int) &__globaldata; 1861 gdt_segs[GPROC0_SEL].ssd_base = 1862 (int) &__globaldata.gd_common_tss; 1863 __globaldata.gd_prvspace = &__globaldata; 1864#endif 1865 1866 for (x = 0; x < NGDT; x++) { 1867#ifdef BDE_DEBUGGER 1868 /* avoid overwriting db entries with APM ones */ 1869 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1870 continue; 1871#endif 1872 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1873 } 1874 1875 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1876 r_gdt.rd_base = (int) gdt; 1877 lgdt(&r_gdt); 1878 1879 /* setup curproc so that mutexes work */ 1880 PCPU_SET(curproc, &proc0); 1881 1882 /* make ldt memory segments */ 1883 /* 1884 * The data segment limit must not cover the user area because we 1885 * don't want the user area to be writable in copyout() etc. (page 1886 * level protection is lost in kernel mode on 386's). Also, we 1887 * don't want the user area to be writable directly (page level 1888 * protection of the user area is not available on 486's with 1889 * CR0_WP set, because there is no user-read/kernel-write mode). 1890 * 1891 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1892 * should be spelled ...MAX_USER... 1893 */ 1894#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1895 /* 1896 * The code segment limit has to cover the user area until we move 1897 * the signal trampoline out of the user area. This is safe because 1898 * the code segment cannot be written to directly. 1899 */ 1900#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1901 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1902 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1903 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1904 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1905 1906 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1907 lldt(_default_ldt); 1908#ifdef USER_LDT 1909 PCPU_SET(currentldt, _default_ldt); 1910#endif 1911 1912 /* exceptions */ 1913 for (x = 0; x < NIDT; x++) 1914 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1915 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1916 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1917 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1918 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1919 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1920 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1921 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1922 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1923 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1924 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1925 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1926 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1927 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1928 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1929 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1930 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1931 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1932 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1933 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1934 setidt(0x80, &IDTVEC(int0x80_syscall), 1935 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1936 1937 r_idt.rd_limit = sizeof(idt0) - 1; 1938 r_idt.rd_base = (int) idt; 1939 lidt(&r_idt); 1940 1941 /* 1942 * We need this mutex before the console probe. 1943 */ 1944 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_COLD); 1945 1946 /* 1947 * Initialize the console before we print anything out. 1948 */ 1949 cninit(); 1950 1951#include "isa.h" 1952#if NISA >0 1953 isa_defaultirq(); 1954#endif 1955 1956 /* 1957 * Giant is used early for at least debugger traps and unexpected traps. 1958 */ 1959 mtx_init(&Giant, "Giant", MTX_DEF | MTX_COLD); 1960 1961#ifdef DDB 1962 kdb_init(); 1963 if (boothowto & RB_KDB) 1964 Debugger("Boot flags requested debugger"); 1965#endif 1966 1967 finishidentcpu(); /* Final stage of CPU initialization */ 1968 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1969 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1970 initializecpu(); /* Initialize CPU registers */ 1971 1972 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1973 PCPU_SET(common_tss.tss_esp0, 1974 (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16); 1975 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1976 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1977 private_tss = 0; 1978 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1979 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1980 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1981 ltr(gsel_tss); 1982 1983 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1984 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1985 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1986 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1987 dblfault_tss.tss_cr3 = (int)IdlePTD; 1988 dblfault_tss.tss_eip = (int) dblfault_handler; 1989 dblfault_tss.tss_eflags = PSL_KERNEL; 1990 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1991 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1992 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1993 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1994 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1995 1996 vm86_initialize(); 1997 getmemsize(first); 1998 1999 /* now running on new page tables, configured,and u/iom is accessible */ 2000 2001 /* Map the message buffer. */ 2002 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 2003 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 2004 2005 msgbufinit(msgbufp, MSGBUF_SIZE); 2006 2007 /* make a call gate to reenter kernel with */ 2008 gdp = &ldt[LSYS5CALLS_SEL].gd; 2009 2010 x = (int) &IDTVEC(syscall); 2011 gdp->gd_looffset = x++; 2012 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 2013 gdp->gd_stkcpy = 1; 2014 gdp->gd_type = SDT_SYS386CGT; 2015 gdp->gd_dpl = SEL_UPL; 2016 gdp->gd_p = 1; 2017 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 2018 2019 /* XXX does this work? */ 2020 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2021 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2022 2023 /* transfer to user mode */ 2024 2025 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 2026 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 2027 2028 /* setup proc 0's pcb */ 2029 proc0.p_addr->u_pcb.pcb_flags = 0; 2030 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 2031 proc0.p_addr->u_pcb.pcb_schednest = 0; 2032 proc0.p_addr->u_pcb.pcb_ext = 0; 2033 proc0.p_md.md_regs = &proc0_tf; 2034} 2035 2036#if defined(I586_CPU) && !defined(NO_F00F_HACK) 2037static void f00f_hack(void *unused); 2038SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 2039 2040static void 2041f00f_hack(void *unused) { 2042 struct gate_descriptor *new_idt; 2043#ifndef SMP 2044 struct region_descriptor r_idt; 2045#endif 2046 vm_offset_t tmp; 2047 2048 if (!has_f00f_bug) 2049 return; 2050 2051 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2052 2053 r_idt.rd_limit = sizeof(idt0) - 1; 2054 2055 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2056 if (tmp == 0) 2057 panic("kmem_alloc returned 0"); 2058 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2059 panic("kmem_alloc returned non-page-aligned memory"); 2060 /* Put the first seven entries in the lower page */ 2061 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2062 bcopy(idt, new_idt, sizeof(idt0)); 2063 r_idt.rd_base = (int)new_idt; 2064 lidt(&r_idt); 2065 idt = new_idt; 2066 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2067 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2068 panic("vm_map_protect failed"); 2069 return; 2070} 2071#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2072 2073int 2074ptrace_set_pc(p, addr) 2075 struct proc *p; 2076 unsigned long addr; 2077{ 2078 p->p_md.md_regs->tf_eip = addr; 2079 return (0); 2080} 2081 2082int 2083ptrace_single_step(p) 2084 struct proc *p; 2085{ 2086 p->p_md.md_regs->tf_eflags |= PSL_T; 2087 return (0); 2088} 2089 2090int ptrace_read_u_check(p, addr, len) 2091 struct proc *p; 2092 vm_offset_t addr; 2093 size_t len; 2094{ 2095 vm_offset_t gap; 2096 2097 if ((vm_offset_t) (addr + len) < addr) 2098 return EPERM; 2099 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2100 return 0; 2101 2102 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2103 2104 if ((vm_offset_t) addr < gap) 2105 return EPERM; 2106 if ((vm_offset_t) (addr + len) <= 2107 (vm_offset_t) (gap + sizeof(struct trapframe))) 2108 return 0; 2109 return EPERM; 2110} 2111 2112int ptrace_write_u(p, off, data) 2113 struct proc *p; 2114 vm_offset_t off; 2115 long data; 2116{ 2117 struct trapframe frame_copy; 2118 vm_offset_t min; 2119 struct trapframe *tp; 2120 2121 /* 2122 * Privileged kernel state is scattered all over the user area. 2123 * Only allow write access to parts of regs and to fpregs. 2124 */ 2125 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2126 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2127 tp = p->p_md.md_regs; 2128 frame_copy = *tp; 2129 *(int *)((char *)&frame_copy + (off - min)) = data; 2130 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2131 !CS_SECURE(frame_copy.tf_cs)) 2132 return (EINVAL); 2133 *(int*)((char *)p->p_addr + off) = data; 2134 return (0); 2135 } 2136 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2137 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2138 *(int*)((char *)p->p_addr + off) = data; 2139 return (0); 2140 } 2141 return (EFAULT); 2142} 2143 2144int 2145fill_regs(p, regs) 2146 struct proc *p; 2147 struct reg *regs; 2148{ 2149 struct pcb *pcb; 2150 struct trapframe *tp; 2151 2152 tp = p->p_md.md_regs; 2153 regs->r_fs = tp->tf_fs; 2154 regs->r_es = tp->tf_es; 2155 regs->r_ds = tp->tf_ds; 2156 regs->r_edi = tp->tf_edi; 2157 regs->r_esi = tp->tf_esi; 2158 regs->r_ebp = tp->tf_ebp; 2159 regs->r_ebx = tp->tf_ebx; 2160 regs->r_edx = tp->tf_edx; 2161 regs->r_ecx = tp->tf_ecx; 2162 regs->r_eax = tp->tf_eax; 2163 regs->r_eip = tp->tf_eip; 2164 regs->r_cs = tp->tf_cs; 2165 regs->r_eflags = tp->tf_eflags; 2166 regs->r_esp = tp->tf_esp; 2167 regs->r_ss = tp->tf_ss; 2168 pcb = &p->p_addr->u_pcb; 2169 regs->r_gs = pcb->pcb_gs; 2170 return (0); 2171} 2172 2173int 2174set_regs(p, regs) 2175 struct proc *p; 2176 struct reg *regs; 2177{ 2178 struct pcb *pcb; 2179 struct trapframe *tp; 2180 2181 tp = p->p_md.md_regs; 2182 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2183 !CS_SECURE(regs->r_cs)) 2184 return (EINVAL); 2185 tp->tf_fs = regs->r_fs; 2186 tp->tf_es = regs->r_es; 2187 tp->tf_ds = regs->r_ds; 2188 tp->tf_edi = regs->r_edi; 2189 tp->tf_esi = regs->r_esi; 2190 tp->tf_ebp = regs->r_ebp; 2191 tp->tf_ebx = regs->r_ebx; 2192 tp->tf_edx = regs->r_edx; 2193 tp->tf_ecx = regs->r_ecx; 2194 tp->tf_eax = regs->r_eax; 2195 tp->tf_eip = regs->r_eip; 2196 tp->tf_cs = regs->r_cs; 2197 tp->tf_eflags = regs->r_eflags; 2198 tp->tf_esp = regs->r_esp; 2199 tp->tf_ss = regs->r_ss; 2200 pcb = &p->p_addr->u_pcb; 2201 pcb->pcb_gs = regs->r_gs; 2202 return (0); 2203} 2204 2205int 2206fill_fpregs(p, fpregs) 2207 struct proc *p; 2208 struct fpreg *fpregs; 2209{ 2210 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2211 return (0); 2212} 2213 2214int 2215set_fpregs(p, fpregs) 2216 struct proc *p; 2217 struct fpreg *fpregs; 2218{ 2219 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2220 return (0); 2221} 2222 2223int 2224fill_dbregs(p, dbregs) 2225 struct proc *p; 2226 struct dbreg *dbregs; 2227{ 2228 struct pcb *pcb; 2229 2230 pcb = &p->p_addr->u_pcb; 2231 dbregs->dr0 = pcb->pcb_dr0; 2232 dbregs->dr1 = pcb->pcb_dr1; 2233 dbregs->dr2 = pcb->pcb_dr2; 2234 dbregs->dr3 = pcb->pcb_dr3; 2235 dbregs->dr4 = 0; 2236 dbregs->dr5 = 0; 2237 dbregs->dr6 = pcb->pcb_dr6; 2238 dbregs->dr7 = pcb->pcb_dr7; 2239 return (0); 2240} 2241 2242int 2243set_dbregs(p, dbregs) 2244 struct proc *p; 2245 struct dbreg *dbregs; 2246{ 2247 struct pcb *pcb; 2248 int i; 2249 u_int32_t mask1, mask2; 2250 2251 /* 2252 * Don't let an illegal value for dr7 get set. Specifically, 2253 * check for undefined settings. Setting these bit patterns 2254 * result in undefined behaviour and can lead to an unexpected 2255 * TRCTRAP. 2256 */ 2257 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2258 i++, mask1 <<= 2, mask2 <<= 2) 2259 if ((dbregs->dr7 & mask1) == mask2) 2260 return (EINVAL); 2261 2262 if (dbregs->dr7 & 0x0000fc00) 2263 return (EINVAL); 2264 2265 2266 2267 pcb = &p->p_addr->u_pcb; 2268 2269 /* 2270 * Don't let a process set a breakpoint that is not within the 2271 * process's address space. If a process could do this, it 2272 * could halt the system by setting a breakpoint in the kernel 2273 * (if ddb was enabled). Thus, we need to check to make sure 2274 * that no breakpoints are being enabled for addresses outside 2275 * process's address space, unless, perhaps, we were called by 2276 * uid 0. 2277 * 2278 * XXX - what about when the watched area of the user's 2279 * address space is written into from within the kernel 2280 * ... wouldn't that still cause a breakpoint to be generated 2281 * from within kernel mode? 2282 */ 2283 2284 if (p->p_ucred->cr_uid != 0) { 2285 if (dbregs->dr7 & 0x3) { 2286 /* dr0 is enabled */ 2287 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2288 return (EINVAL); 2289 } 2290 2291 if (dbregs->dr7 & (0x3<<2)) { 2292 /* dr1 is enabled */ 2293 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2294 return (EINVAL); 2295 } 2296 2297 if (dbregs->dr7 & (0x3<<4)) { 2298 /* dr2 is enabled */ 2299 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2300 return (EINVAL); 2301 } 2302 2303 if (dbregs->dr7 & (0x3<<6)) { 2304 /* dr3 is enabled */ 2305 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2306 return (EINVAL); 2307 } 2308 } 2309 2310 pcb->pcb_dr0 = dbregs->dr0; 2311 pcb->pcb_dr1 = dbregs->dr1; 2312 pcb->pcb_dr2 = dbregs->dr2; 2313 pcb->pcb_dr3 = dbregs->dr3; 2314 pcb->pcb_dr6 = dbregs->dr6; 2315 pcb->pcb_dr7 = dbregs->dr7; 2316 2317 pcb->pcb_flags |= PCB_DBREGS; 2318 2319 return (0); 2320} 2321 2322/* 2323 * Return > 0 if a hardware breakpoint has been hit, and the 2324 * breakpoint was in user space. Return 0, otherwise. 2325 */ 2326int 2327user_dbreg_trap(void) 2328{ 2329 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2330 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2331 int nbp; /* number of breakpoints that triggered */ 2332 caddr_t addr[4]; /* breakpoint addresses */ 2333 int i; 2334 2335 dr7 = rdr7(); 2336 if ((dr7 & 0x000000ff) == 0) { 2337 /* 2338 * all GE and LE bits in the dr7 register are zero, 2339 * thus the trap couldn't have been caused by the 2340 * hardware debug registers 2341 */ 2342 return 0; 2343 } 2344 2345 nbp = 0; 2346 dr6 = rdr6(); 2347 bp = dr6 & 0x0000000f; 2348 2349 if (!bp) { 2350 /* 2351 * None of the breakpoint bits are set meaning this 2352 * trap was not caused by any of the debug registers 2353 */ 2354 return 0; 2355 } 2356 2357 /* 2358 * at least one of the breakpoints were hit, check to see 2359 * which ones and if any of them are user space addresses 2360 */ 2361 2362 if (bp & 0x01) { 2363 addr[nbp++] = (caddr_t)rdr0(); 2364 } 2365 if (bp & 0x02) { 2366 addr[nbp++] = (caddr_t)rdr1(); 2367 } 2368 if (bp & 0x04) { 2369 addr[nbp++] = (caddr_t)rdr2(); 2370 } 2371 if (bp & 0x08) { 2372 addr[nbp++] = (caddr_t)rdr3(); 2373 } 2374 2375 for (i=0; i<nbp; i++) { 2376 if (addr[i] < 2377 (caddr_t)VM_MAXUSER_ADDRESS) { 2378 /* 2379 * addr[i] is in user space 2380 */ 2381 return nbp; 2382 } 2383 } 2384 2385 /* 2386 * None of the breakpoints are in user space. 2387 */ 2388 return 0; 2389} 2390 2391 2392#ifndef DDB 2393void 2394Debugger(const char *msg) 2395{ 2396 printf("Debugger(\"%s\") called.\n", msg); 2397} 2398#endif /* no DDB */ 2399 2400#include <sys/disklabel.h> 2401 2402/* 2403 * Determine the size of the transfer, and make sure it is 2404 * within the boundaries of the partition. Adjust transfer 2405 * if needed, and signal errors or early completion. 2406 */ 2407int 2408bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2409{ 2410 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2411 int labelsect = lp->d_partitions[0].p_offset; 2412 int maxsz = p->p_size, 2413 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2414 2415 /* overwriting disk label ? */ 2416 /* XXX should also protect bootstrap in first 8K */ 2417 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2418#if LABELSECTOR != 0 2419 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2420#endif 2421 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2422 bp->bio_error = EROFS; 2423 goto bad; 2424 } 2425 2426#if defined(DOSBBSECTOR) && defined(notyet) 2427 /* overwriting master boot record? */ 2428 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2429 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2430 bp->bio_error = EROFS; 2431 goto bad; 2432 } 2433#endif 2434 2435 /* beyond partition? */ 2436 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2437 /* if exactly at end of disk, return an EOF */ 2438 if (bp->bio_blkno == maxsz) { 2439 bp->bio_resid = bp->bio_bcount; 2440 return(0); 2441 } 2442 /* or truncate if part of it fits */ 2443 sz = maxsz - bp->bio_blkno; 2444 if (sz <= 0) { 2445 bp->bio_error = EINVAL; 2446 goto bad; 2447 } 2448 bp->bio_bcount = sz << DEV_BSHIFT; 2449 } 2450 2451 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2452 return(1); 2453 2454bad: 2455 bp->bio_flags |= BIO_ERROR; 2456 return(-1); 2457} 2458 2459#ifdef DDB 2460 2461/* 2462 * Provide inb() and outb() as functions. They are normally only 2463 * available as macros calling inlined functions, thus cannot be 2464 * called inside DDB. 2465 * 2466 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2467 */ 2468 2469#undef inb 2470#undef outb 2471 2472/* silence compiler warnings */ 2473u_char inb(u_int); 2474void outb(u_int, u_char); 2475 2476u_char 2477inb(u_int port) 2478{ 2479 u_char data; 2480 /* 2481 * We use %%dx and not %1 here because i/o is done at %dx and not at 2482 * %edx, while gcc generates inferior code (movw instead of movl) 2483 * if we tell it to load (u_short) port. 2484 */ 2485 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2486 return (data); 2487} 2488 2489void 2490outb(u_int port, u_char data) 2491{ 2492 u_char al; 2493 /* 2494 * Use an unnecessary assignment to help gcc's register allocator. 2495 * This make a large difference for gcc-1.40 and a tiny difference 2496 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2497 * best results. gcc-2.6.0 can't handle this. 2498 */ 2499 al = data; 2500 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2501} 2502 2503#endif /* DDB */ 2504