machdep.c revision 72746
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 72746 2001-02-20 05:26:15Z jhb $ 39 */ 40 41#include "opt_atalk.h" 42#include "opt_compat.h" 43#include "opt_cpu.h" 44#include "opt_ddb.h" 45#include "opt_inet.h" 46#include "opt_ipx.h" 47#include "opt_isa.h" 48#include "opt_maxmem.h" 49#include "opt_msgbuf.h" 50#include "opt_npx.h" 51#include "opt_perfmon.h" 52#include "opt_user_ldt.h" 53#include "opt_userconfig.h" 54 55#include <sys/param.h> 56#include <sys/systm.h> 57#include <sys/sysproto.h> 58#include <sys/signalvar.h> 59#include <sys/ipl.h> 60#include <sys/kernel.h> 61#include <sys/ktr.h> 62#include <sys/linker.h> 63#include <sys/malloc.h> 64#include <sys/mutex.h> 65#include <sys/proc.h> 66#include <sys/bio.h> 67#include <sys/buf.h> 68#include <sys/reboot.h> 69#include <sys/callout.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 253struct mtx sched_lock; 254struct mtx 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 buffer_map->system_map = 1; 402 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 403 (nswbuf*MAXPHYS) + pager_map_size); 404 pager_map->system_map = 1; 405 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 406 (16*(ARG_MAX+(PAGE_SIZE*3)))); 407 408 /* 409 * XXX: Mbuf system machine-specific initializations should 410 * go here, if anywhere. 411 */ 412 413 /* 414 * Initialize callouts 415 */ 416 SLIST_INIT(&callfree); 417 for (i = 0; i < ncallout; i++) { 418 callout_init(&callout[i], 0); 419 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 420 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 421 } 422 423 for (i = 0; i < callwheelsize; i++) { 424 TAILQ_INIT(&callwheel[i]); 425 } 426 427 mtx_init(&callout_lock, "callout", MTX_SPIN | MTX_RECURSE); 428 429#if defined(USERCONFIG) 430 userconfig(); 431 cninit(); /* the preferred console may have changed */ 432#endif 433 434 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 435 ptoa(cnt.v_free_count) / 1024); 436 437 /* 438 * Set up buffers, so they can be used to read disk labels. 439 */ 440 bufinit(); 441 vm_pager_bufferinit(); 442 443 SLIST_INIT(&cpuhead); 444 SLIST_INSERT_HEAD(&cpuhead, GLOBALDATA, gd_allcpu); 445 446#ifdef SMP 447 /* 448 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 449 */ 450 mp_start(); /* fire up the APs and APICs */ 451 mp_announce(); 452#endif /* SMP */ 453 cpu_setregs(); 454} 455 456/* 457 * Send an interrupt to process. 458 * 459 * Stack is set up to allow sigcode stored 460 * at top to call routine, followed by kcall 461 * to sigreturn routine below. After sigreturn 462 * resets the signal mask, the stack, and the 463 * frame pointer, it returns to the user 464 * specified pc, psl. 465 */ 466static void 467osendsig(catcher, sig, mask, code) 468 sig_t catcher; 469 int sig; 470 sigset_t *mask; 471 u_long code; 472{ 473 struct osigframe sf; 474 struct osigframe *fp; 475 struct proc *p; 476 struct sigacts *psp; 477 struct trapframe *regs; 478 int oonstack; 479 480 p = curproc; 481 PROC_LOCK(p); 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 PROC_UNLOCK(p); 497 498 /* 499 * grow_stack() will return 0 if *fp does not fit inside the stack 500 * and the stack can not be grown. 501 * useracc() will return FALSE if access is denied. 502 */ 503 if (grow_stack(p, (int)fp) == 0 || 504 !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 505 /* 506 * Process has trashed its stack; give it an illegal 507 * instruction to halt it in its tracks. 508 */ 509 PROC_LOCK(p); 510 SIGACTION(p, SIGILL) = SIG_DFL; 511 SIGDELSET(p->p_sigignore, SIGILL); 512 SIGDELSET(p->p_sigcatch, SIGILL); 513 SIGDELSET(p->p_sigmask, SIGILL); 514 PROC_UNLOCK(p); 515 psignal(p, SIGILL); 516 return; 517 } 518 519 /* Translate the signal if appropriate. */ 520 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 521 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 522 523 /* Build the argument list for the signal handler. */ 524 sf.sf_signum = sig; 525 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 526 PROC_LOCK(p); 527 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 528 /* Signal handler installed with SA_SIGINFO. */ 529 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 530 sf.sf_siginfo.si_signo = sig; 531 sf.sf_siginfo.si_code = code; 532 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 533 } else { 534 /* Old FreeBSD-style arguments. */ 535 sf.sf_arg2 = code; 536 sf.sf_addr = regs->tf_err; 537 sf.sf_ahu.sf_handler = catcher; 538 } 539 PROC_UNLOCK(p); 540 541 /* Save most if not all of trap frame. */ 542 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 543 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 544 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 545 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 546 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 547 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 548 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 549 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 550 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 551 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 552 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 553 sf.sf_siginfo.si_sc.sc_gs = rgs(); 554 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 555 556 /* Build the signal context to be used by osigreturn(). */ 557 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 558 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 559 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 560 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 561 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 562 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 563 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 564 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 565 566 /* 567 * If we're a vm86 process, we want to save the segment registers. 568 * We also change eflags to be our emulated eflags, not the actual 569 * eflags. 570 */ 571 if (regs->tf_eflags & PSL_VM) { 572 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 573 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 574 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 575 576 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 577 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 578 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 579 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 580 581 if (vm86->vm86_has_vme == 0) 582 sf.sf_siginfo.si_sc.sc_ps = 583 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 584 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 585 586 /* See sendsig() for comments. */ 587 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 588 } 589 590 /* Copy the sigframe out to the user's stack. */ 591 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 592 /* 593 * Something is wrong with the stack pointer. 594 * ...Kill the process. 595 */ 596 sigexit(p, SIGILL); 597 } 598 599 regs->tf_esp = (int)fp; 600 regs->tf_eip = PS_STRINGS - szosigcode; 601 regs->tf_cs = _ucodesel; 602 regs->tf_ds = _udatasel; 603 regs->tf_es = _udatasel; 604 regs->tf_fs = _udatasel; 605 load_gs(_udatasel); 606 regs->tf_ss = _udatasel; 607} 608 609void 610sendsig(catcher, sig, mask, code) 611 sig_t catcher; 612 int sig; 613 sigset_t *mask; 614 u_long code; 615{ 616 struct sigframe sf; 617 struct proc *p; 618 struct sigacts *psp; 619 struct trapframe *regs; 620 struct sigframe *sfp; 621 int oonstack; 622 623 p = curproc; 624 PROC_LOCK(p); 625 psp = p->p_sigacts; 626 if (SIGISMEMBER(psp->ps_osigset, sig)) { 627 PROC_UNLOCK(p); 628 osendsig(catcher, sig, mask, code); 629 return; 630 } 631 regs = p->p_md.md_regs; 632 oonstack = sigonstack(regs->tf_esp); 633 634 /* Save user context. */ 635 bzero(&sf, sizeof(sf)); 636 sf.sf_uc.uc_sigmask = *mask; 637 sf.sf_uc.uc_stack = p->p_sigstk; 638 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 639 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 640 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 641 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 642 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 643 644 /* Allocate and validate space for the signal handler context. */ 645 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 646 SIGISMEMBER(psp->ps_sigonstack, sig)) { 647 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 648 p->p_sigstk.ss_size - sizeof(struct sigframe)); 649#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 650 p->p_sigstk.ss_flags |= SS_ONSTACK; 651#endif 652 } else 653 sfp = (struct sigframe *)regs->tf_esp - 1; 654 PROC_UNLOCK(p); 655 656 /* 657 * grow_stack() will return 0 if *sfp does not fit inside the stack 658 * and the stack can not be grown. 659 * useracc() will return FALSE if access is denied. 660 */ 661 if (grow_stack(p, (int)sfp) == 0 || 662 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 663 /* 664 * Process has trashed its stack; give it an illegal 665 * instruction to halt it in its tracks. 666 */ 667#ifdef DEBUG 668 printf("process %d has trashed its stack\n", p->p_pid); 669#endif 670 PROC_LOCK(p); 671 SIGACTION(p, SIGILL) = SIG_DFL; 672 SIGDELSET(p->p_sigignore, SIGILL); 673 SIGDELSET(p->p_sigcatch, SIGILL); 674 SIGDELSET(p->p_sigmask, SIGILL); 675 PROC_UNLOCK(p); 676 psignal(p, SIGILL); 677 return; 678 } 679 680 /* Translate the signal if appropriate. */ 681 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 682 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 683 684 /* Build the argument list for the signal handler. */ 685 sf.sf_signum = sig; 686 sf.sf_ucontext = (register_t)&sfp->sf_uc; 687 PROC_LOCK(p); 688 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 689 /* Signal handler installed with SA_SIGINFO. */ 690 sf.sf_siginfo = (register_t)&sfp->sf_si; 691 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 692 693 /* Fill siginfo structure. */ 694 sf.sf_si.si_signo = sig; 695 sf.sf_si.si_code = code; 696 sf.sf_si.si_addr = (void *)regs->tf_err; 697 } else { 698 /* Old FreeBSD-style arguments. */ 699 sf.sf_siginfo = code; 700 sf.sf_addr = regs->tf_err; 701 sf.sf_ahu.sf_handler = catcher; 702 } 703 PROC_UNLOCK(p); 704 705 /* 706 * If we're a vm86 process, we want to save the segment registers. 707 * We also change eflags to be our emulated eflags, not the actual 708 * eflags. 709 */ 710 if (regs->tf_eflags & PSL_VM) { 711 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 712 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 713 714 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 715 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 716 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 717 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 718 719 if (vm86->vm86_has_vme == 0) 720 sf.sf_uc.uc_mcontext.mc_eflags = 721 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 722 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 723 724 /* 725 * We should never have PSL_T set when returning from vm86 726 * mode. It may be set here if we deliver a signal before 727 * getting to vm86 mode, so turn it off. 728 * 729 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 730 * syscalls made by the signal handler. This just avoids 731 * wasting time for our lazy fixup of such faults. PSL_NT 732 * does nothing in vm86 mode, but vm86 programs can set it 733 * almost legitimately in probes for old cpu types. 734 */ 735 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 736 } 737 738 /* Copy the sigframe out to the user's stack. */ 739 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 740 /* 741 * Something is wrong with the stack pointer. 742 * ...Kill the process. 743 */ 744 sigexit(p, SIGILL); 745 } 746 747 regs->tf_esp = (int)sfp; 748 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 749 regs->tf_cs = _ucodesel; 750 regs->tf_ds = _udatasel; 751 regs->tf_es = _udatasel; 752 regs->tf_fs = _udatasel; 753 load_gs(_udatasel); 754 regs->tf_ss = _udatasel; 755} 756 757/* 758 * System call to cleanup state after a signal 759 * has been taken. Reset signal mask and 760 * stack state from context left by sendsig (above). 761 * Return to previous pc and psl as specified by 762 * context left by sendsig. Check carefully to 763 * make sure that the user has not modified the 764 * state to gain improper privileges. 765 */ 766int 767osigreturn(p, uap) 768 struct proc *p; 769 struct osigreturn_args /* { 770 struct osigcontext *sigcntxp; 771 } */ *uap; 772{ 773 struct trapframe *regs; 774 struct osigcontext *scp; 775 int eflags; 776 777 regs = p->p_md.md_regs; 778 scp = uap->sigcntxp; 779 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 780 return (EFAULT); 781 eflags = scp->sc_ps; 782 if (eflags & PSL_VM) { 783 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 784 struct vm86_kernel *vm86; 785 786 /* 787 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 788 * set up the vm86 area, and we can't enter vm86 mode. 789 */ 790 if (p->p_addr->u_pcb.pcb_ext == 0) 791 return (EINVAL); 792 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 793 if (vm86->vm86_inited == 0) 794 return (EINVAL); 795 796 /* Go back to user mode if both flags are set. */ 797 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 798 trapsignal(p, SIGBUS, 0); 799 800 if (vm86->vm86_has_vme) { 801 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 802 (eflags & VME_USERCHANGE) | PSL_VM; 803 } else { 804 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 805 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 806 } 807 tf->tf_vm86_ds = scp->sc_ds; 808 tf->tf_vm86_es = scp->sc_es; 809 tf->tf_vm86_fs = scp->sc_fs; 810 tf->tf_vm86_gs = scp->sc_gs; 811 tf->tf_ds = _udatasel; 812 tf->tf_es = _udatasel; 813 tf->tf_fs = _udatasel; 814 } else { 815 /* 816 * Don't allow users to change privileged or reserved flags. 817 */ 818 /* 819 * XXX do allow users to change the privileged flag PSL_RF. 820 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 821 * should sometimes set it there too. tf_eflags is kept in 822 * the signal context during signal handling and there is no 823 * other place to remember it, so the PSL_RF bit may be 824 * corrupted by the signal handler without us knowing. 825 * Corruption of the PSL_RF bit at worst causes one more or 826 * one less debugger trap, so allowing it is fairly harmless. 827 */ 828 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 829 return (EINVAL); 830 } 831 832 /* 833 * Don't allow users to load a valid privileged %cs. Let the 834 * hardware check for invalid selectors, excess privilege in 835 * other selectors, invalid %eip's and invalid %esp's. 836 */ 837 if (!CS_SECURE(scp->sc_cs)) { 838 trapsignal(p, SIGBUS, T_PROTFLT); 839 return (EINVAL); 840 } 841 regs->tf_ds = scp->sc_ds; 842 regs->tf_es = scp->sc_es; 843 regs->tf_fs = scp->sc_fs; 844 } 845 846 /* Restore remaining registers. */ 847 regs->tf_eax = scp->sc_eax; 848 regs->tf_ebx = scp->sc_ebx; 849 regs->tf_ecx = scp->sc_ecx; 850 regs->tf_edx = scp->sc_edx; 851 regs->tf_esi = scp->sc_esi; 852 regs->tf_edi = scp->sc_edi; 853 regs->tf_cs = scp->sc_cs; 854 regs->tf_ss = scp->sc_ss; 855 regs->tf_isp = scp->sc_isp; 856 857 PROC_LOCK(p); 858#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 859 if (scp->sc_onstack & 1) 860 p->p_sigstk.ss_flags |= SS_ONSTACK; 861 else 862 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 863#endif 864 865 SIGSETOLD(p->p_sigmask, scp->sc_mask); 866 SIG_CANTMASK(p->p_sigmask); 867 PROC_UNLOCK(p); 868 regs->tf_ebp = scp->sc_fp; 869 regs->tf_esp = scp->sc_sp; 870 regs->tf_eip = scp->sc_pc; 871 regs->tf_eflags = eflags; 872 return (EJUSTRETURN); 873} 874 875int 876sigreturn(p, uap) 877 struct proc *p; 878 struct sigreturn_args /* { 879 ucontext_t *sigcntxp; 880 } */ *uap; 881{ 882 struct trapframe *regs; 883 ucontext_t *ucp; 884 int cs, eflags; 885 886 ucp = uap->sigcntxp; 887 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 888 return (EFAULT); 889 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 890 return (osigreturn(p, (struct osigreturn_args *)uap)); 891 892 /* 893 * Since ucp is not an osigcontext but a ucontext_t, we have to 894 * check again if all of it is accessible. A ucontext_t is 895 * much larger, so instead of just checking for the pointer 896 * being valid for the size of an osigcontext, now check for 897 * it being valid for a whole, new-style ucontext_t. 898 */ 899 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 900 return (EFAULT); 901 902 regs = p->p_md.md_regs; 903 eflags = ucp->uc_mcontext.mc_eflags; 904 if (eflags & PSL_VM) { 905 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 906 struct vm86_kernel *vm86; 907 908 /* 909 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 910 * set up the vm86 area, and we can't enter vm86 mode. 911 */ 912 if (p->p_addr->u_pcb.pcb_ext == 0) 913 return (EINVAL); 914 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 915 if (vm86->vm86_inited == 0) 916 return (EINVAL); 917 918 /* Go back to user mode if both flags are set. */ 919 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 920 trapsignal(p, SIGBUS, 0); 921 922 if (vm86->vm86_has_vme) { 923 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 924 (eflags & VME_USERCHANGE) | PSL_VM; 925 } else { 926 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 927 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 928 } 929 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 930 tf->tf_eflags = eflags; 931 tf->tf_vm86_ds = tf->tf_ds; 932 tf->tf_vm86_es = tf->tf_es; 933 tf->tf_vm86_fs = tf->tf_fs; 934 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 935 tf->tf_ds = _udatasel; 936 tf->tf_es = _udatasel; 937 tf->tf_fs = _udatasel; 938 } else { 939 /* 940 * Don't allow users to change privileged or reserved flags. 941 */ 942 /* 943 * XXX do allow users to change the privileged flag PSL_RF. 944 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 945 * should sometimes set it there too. tf_eflags is kept in 946 * the signal context during signal handling and there is no 947 * other place to remember it, so the PSL_RF bit may be 948 * corrupted by the signal handler without us knowing. 949 * Corruption of the PSL_RF bit at worst causes one more or 950 * one less debugger trap, so allowing it is fairly harmless. 951 */ 952 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 953 printf("sigreturn: eflags = 0x%x\n", eflags); 954 return (EINVAL); 955 } 956 957 /* 958 * Don't allow users to load a valid privileged %cs. Let the 959 * hardware check for invalid selectors, excess privilege in 960 * other selectors, invalid %eip's and invalid %esp's. 961 */ 962 cs = ucp->uc_mcontext.mc_cs; 963 if (!CS_SECURE(cs)) { 964 printf("sigreturn: cs = 0x%x\n", cs); 965 trapsignal(p, SIGBUS, T_PROTFLT); 966 return (EINVAL); 967 } 968 969 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 970 } 971 972 PROC_LOCK(p); 973#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 974 if (ucp->uc_mcontext.mc_onstack & 1) 975 p->p_sigstk.ss_flags |= SS_ONSTACK; 976 else 977 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 978#endif 979 980 p->p_sigmask = ucp->uc_sigmask; 981 SIG_CANTMASK(p->p_sigmask); 982 PROC_UNLOCK(p); 983 return (EJUSTRETURN); 984} 985 986/* 987 * Machine dependent boot() routine 988 * 989 * I haven't seen anything to put here yet 990 * Possibly some stuff might be grafted back here from boot() 991 */ 992void 993cpu_boot(int howto) 994{ 995} 996 997/* 998 * Shutdown the CPU as much as possible 999 */ 1000void 1001cpu_halt(void) 1002{ 1003 for (;;) 1004 __asm__ ("hlt"); 1005} 1006 1007/* 1008 * Hook to idle the CPU when possible. This currently only works in 1009 * the !SMP case, as there is no clean way to ensure that a CPU will be 1010 * woken when there is work available for it. 1011 */ 1012static int cpu_idle_hlt = 1; 1013SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 1014 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 1015 1016/* 1017 * Note that we have to be careful here to avoid a race between checking 1018 * procrunnable() and actually halting. If we don't do this, we may waste 1019 * the time between calling hlt and the next interrupt even though there 1020 * is a runnable process. 1021 */ 1022void 1023cpu_idle(void) 1024{ 1025#ifndef SMP 1026 if (cpu_idle_hlt) { 1027 disable_intr(); 1028 if (procrunnable()) 1029 enable_intr(); 1030 else { 1031 enable_intr(); 1032 __asm __volatile("hlt"); 1033 } 1034 } 1035#endif 1036} 1037 1038/* 1039 * Clear registers on exec 1040 */ 1041void 1042setregs(p, entry, stack, ps_strings) 1043 struct proc *p; 1044 u_long entry; 1045 u_long stack; 1046 u_long ps_strings; 1047{ 1048 struct trapframe *regs = p->p_md.md_regs; 1049 struct pcb *pcb = &p->p_addr->u_pcb; 1050 1051#ifdef USER_LDT 1052 /* was i386_user_cleanup() in NetBSD */ 1053 user_ldt_free(pcb); 1054#endif 1055 1056 bzero((char *)regs, sizeof(struct trapframe)); 1057 regs->tf_eip = entry; 1058 regs->tf_esp = stack; 1059 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1060 regs->tf_ss = _udatasel; 1061 regs->tf_ds = _udatasel; 1062 regs->tf_es = _udatasel; 1063 regs->tf_fs = _udatasel; 1064 regs->tf_cs = _ucodesel; 1065 1066 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1067 regs->tf_ebx = ps_strings; 1068 1069 /* reset %gs as well */ 1070 if (pcb == PCPU_GET(curpcb)) 1071 load_gs(_udatasel); 1072 else 1073 pcb->pcb_gs = _udatasel; 1074 1075 /* 1076 * Reset the hardware debug registers if they were in use. 1077 * They won't have any meaning for the newly exec'd process. 1078 */ 1079 if (pcb->pcb_flags & PCB_DBREGS) { 1080 pcb->pcb_dr0 = 0; 1081 pcb->pcb_dr1 = 0; 1082 pcb->pcb_dr2 = 0; 1083 pcb->pcb_dr3 = 0; 1084 pcb->pcb_dr6 = 0; 1085 pcb->pcb_dr7 = 0; 1086 if (pcb == PCPU_GET(curpcb)) { 1087 /* 1088 * Clear the debug registers on the running 1089 * CPU, otherwise they will end up affecting 1090 * the next process we switch to. 1091 */ 1092 reset_dbregs(); 1093 } 1094 pcb->pcb_flags &= ~PCB_DBREGS; 1095 } 1096 1097 /* 1098 * Initialize the math emulator (if any) for the current process. 1099 * Actually, just clear the bit that says that the emulator has 1100 * been initialized. Initialization is delayed until the process 1101 * traps to the emulator (if it is done at all) mainly because 1102 * emulators don't provide an entry point for initialization. 1103 */ 1104 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1105 1106 /* 1107 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1108 * for why fwait must be trapped at least if there is an npx or an 1109 * emulator). This is mainly to handle the case where npx0 is not 1110 * configured, since the npx routines normally set up the trap 1111 * otherwise. It should be done only at boot time, but doing it 1112 * here allows modifying `npx_exists' for testing the emulator on 1113 * systems with an npx. 1114 */ 1115 load_cr0(rcr0() | CR0_MP | CR0_TS); 1116 1117#ifdef DEV_NPX 1118 /* Initialize the npx (if any) for the current process. */ 1119 npxinit(__INITIAL_NPXCW__); 1120#endif 1121 1122 /* 1123 * XXX - Linux emulator 1124 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1125 * on it. 1126 */ 1127 p->p_retval[1] = 0; 1128} 1129 1130void 1131cpu_setregs(void) 1132{ 1133 unsigned int cr0; 1134 1135 cr0 = rcr0(); 1136 cr0 |= CR0_NE; /* Done by npxinit() */ 1137 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 1138#ifndef I386_CPU 1139 cr0 |= CR0_WP | CR0_AM; 1140#endif 1141 load_cr0(cr0); 1142 load_gs(_udatasel); 1143} 1144 1145static int 1146sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1147{ 1148 int error; 1149 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1150 req); 1151 if (!error && req->newptr) 1152 resettodr(); 1153 return (error); 1154} 1155 1156SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1157 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1158 1159SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1160 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1161 1162SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1163 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1164 1165SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1166 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1167 1168/* 1169 * Initialize 386 and configure to run kernel 1170 */ 1171 1172/* 1173 * Initialize segments & interrupt table 1174 */ 1175 1176int _default_ldt; 1177union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1178static struct gate_descriptor idt0[NIDT]; 1179struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1180union descriptor ldt[NLDT]; /* local descriptor table */ 1181#ifdef SMP 1182/* table descriptors - used to load tables by microp */ 1183struct region_descriptor r_gdt, r_idt; 1184#endif 1185 1186int private_tss; /* flag indicating private tss */ 1187 1188#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1189extern int has_f00f_bug; 1190#endif 1191 1192static struct i386tss dblfault_tss; 1193static char dblfault_stack[PAGE_SIZE]; 1194 1195extern struct user *proc0paddr; 1196 1197 1198/* software prototypes -- in more palatable form */ 1199struct soft_segment_descriptor gdt_segs[] = { 1200/* GNULL_SEL 0 Null Descriptor */ 1201{ 0x0, /* segment base address */ 1202 0x0, /* length */ 1203 0, /* segment type */ 1204 0, /* segment descriptor priority level */ 1205 0, /* segment descriptor present */ 1206 0, 0, 1207 0, /* default 32 vs 16 bit size */ 1208 0 /* limit granularity (byte/page units)*/ }, 1209/* GCODE_SEL 1 Code Descriptor for kernel */ 1210{ 0x0, /* segment base address */ 1211 0xfffff, /* length - all address space */ 1212 SDT_MEMERA, /* segment type */ 1213 0, /* segment descriptor priority level */ 1214 1, /* segment descriptor present */ 1215 0, 0, 1216 1, /* default 32 vs 16 bit size */ 1217 1 /* limit granularity (byte/page units)*/ }, 1218/* GDATA_SEL 2 Data Descriptor for kernel */ 1219{ 0x0, /* segment base address */ 1220 0xfffff, /* length - all address space */ 1221 SDT_MEMRWA, /* segment type */ 1222 0, /* segment descriptor priority level */ 1223 1, /* segment descriptor present */ 1224 0, 0, 1225 1, /* default 32 vs 16 bit size */ 1226 1 /* limit granularity (byte/page units)*/ }, 1227/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1228{ 0x0, /* segment base address */ 1229 0xfffff, /* length - all address space */ 1230 SDT_MEMRWA, /* segment type */ 1231 0, /* segment descriptor priority level */ 1232 1, /* segment descriptor present */ 1233 0, 0, 1234 1, /* default 32 vs 16 bit size */ 1235 1 /* limit granularity (byte/page units)*/ }, 1236/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1237{ 1238 0x0, /* segment base address */ 1239 sizeof(struct i386tss)-1,/* length - all address space */ 1240 SDT_SYS386TSS, /* segment type */ 1241 0, /* segment descriptor priority level */ 1242 1, /* segment descriptor present */ 1243 0, 0, 1244 0, /* unused - default 32 vs 16 bit size */ 1245 0 /* limit granularity (byte/page units)*/ }, 1246/* GLDT_SEL 5 LDT Descriptor */ 1247{ (int) ldt, /* segment base address */ 1248 sizeof(ldt)-1, /* length - all address space */ 1249 SDT_SYSLDT, /* segment type */ 1250 SEL_UPL, /* segment descriptor priority level */ 1251 1, /* segment descriptor present */ 1252 0, 0, 1253 0, /* unused - default 32 vs 16 bit size */ 1254 0 /* limit granularity (byte/page units)*/ }, 1255/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1256{ (int) ldt, /* segment base address */ 1257 (512 * sizeof(union descriptor)-1), /* length */ 1258 SDT_SYSLDT, /* segment type */ 1259 0, /* segment descriptor priority level */ 1260 1, /* segment descriptor present */ 1261 0, 0, 1262 0, /* unused - default 32 vs 16 bit size */ 1263 0 /* limit granularity (byte/page units)*/ }, 1264/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1265{ 0x0, /* segment base address */ 1266 0x0, /* length - all address space */ 1267 0, /* segment type */ 1268 0, /* segment descriptor priority level */ 1269 0, /* segment descriptor present */ 1270 0, 0, 1271 0, /* default 32 vs 16 bit size */ 1272 0 /* limit granularity (byte/page units)*/ }, 1273/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1274{ 0x400, /* segment base address */ 1275 0xfffff, /* length */ 1276 SDT_MEMRWA, /* segment type */ 1277 0, /* segment descriptor priority level */ 1278 1, /* segment descriptor present */ 1279 0, 0, 1280 1, /* default 32 vs 16 bit size */ 1281 1 /* limit granularity (byte/page units)*/ }, 1282/* GPANIC_SEL 9 Panic Tss Descriptor */ 1283{ (int) &dblfault_tss, /* segment base address */ 1284 sizeof(struct i386tss)-1,/* length - all address space */ 1285 SDT_SYS386TSS, /* segment type */ 1286 0, /* segment descriptor priority level */ 1287 1, /* segment descriptor present */ 1288 0, 0, 1289 0, /* unused - default 32 vs 16 bit size */ 1290 0 /* limit granularity (byte/page units)*/ }, 1291/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1292{ 0, /* segment base address (overwritten) */ 1293 0xfffff, /* length */ 1294 SDT_MEMERA, /* segment type */ 1295 0, /* segment descriptor priority level */ 1296 1, /* segment descriptor present */ 1297 0, 0, 1298 0, /* default 32 vs 16 bit size */ 1299 1 /* limit granularity (byte/page units)*/ }, 1300/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1301{ 0, /* segment base address (overwritten) */ 1302 0xfffff, /* length */ 1303 SDT_MEMERA, /* segment type */ 1304 0, /* segment descriptor priority level */ 1305 1, /* segment descriptor present */ 1306 0, 0, 1307 0, /* default 32 vs 16 bit size */ 1308 1 /* limit granularity (byte/page units)*/ }, 1309/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1310{ 0, /* segment base address (overwritten) */ 1311 0xfffff, /* length */ 1312 SDT_MEMRWA, /* segment type */ 1313 0, /* segment descriptor priority level */ 1314 1, /* segment descriptor present */ 1315 0, 0, 1316 1, /* default 32 vs 16 bit size */ 1317 1 /* limit granularity (byte/page units)*/ }, 1318/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1319{ 0, /* segment base address (overwritten) */ 1320 0xfffff, /* length */ 1321 SDT_MEMRWA, /* segment type */ 1322 0, /* segment descriptor priority level */ 1323 1, /* segment descriptor present */ 1324 0, 0, 1325 0, /* default 32 vs 16 bit size */ 1326 1 /* limit granularity (byte/page units)*/ }, 1327/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1328{ 0, /* segment base address (overwritten) */ 1329 0xfffff, /* length */ 1330 SDT_MEMRWA, /* segment type */ 1331 0, /* segment descriptor priority level */ 1332 1, /* segment descriptor present */ 1333 0, 0, 1334 0, /* default 32 vs 16 bit size */ 1335 1 /* limit granularity (byte/page units)*/ }, 1336}; 1337 1338static struct soft_segment_descriptor ldt_segs[] = { 1339 /* Null Descriptor - overwritten by call gate */ 1340{ 0x0, /* segment base address */ 1341 0x0, /* length - all address space */ 1342 0, /* segment type */ 1343 0, /* segment descriptor priority level */ 1344 0, /* segment descriptor present */ 1345 0, 0, 1346 0, /* default 32 vs 16 bit size */ 1347 0 /* limit granularity (byte/page units)*/ }, 1348 /* Null Descriptor - overwritten by call gate */ 1349{ 0x0, /* segment base address */ 1350 0x0, /* length - all address space */ 1351 0, /* segment type */ 1352 0, /* segment descriptor priority level */ 1353 0, /* segment descriptor present */ 1354 0, 0, 1355 0, /* default 32 vs 16 bit size */ 1356 0 /* limit granularity (byte/page units)*/ }, 1357 /* Null Descriptor - overwritten by call gate */ 1358{ 0x0, /* segment base address */ 1359 0x0, /* length - all address space */ 1360 0, /* segment type */ 1361 0, /* segment descriptor priority level */ 1362 0, /* segment descriptor present */ 1363 0, 0, 1364 0, /* default 32 vs 16 bit size */ 1365 0 /* limit granularity (byte/page units)*/ }, 1366 /* Code Descriptor for user */ 1367{ 0x0, /* segment base address */ 1368 0xfffff, /* length - all address space */ 1369 SDT_MEMERA, /* segment type */ 1370 SEL_UPL, /* segment descriptor priority level */ 1371 1, /* segment descriptor present */ 1372 0, 0, 1373 1, /* default 32 vs 16 bit size */ 1374 1 /* limit granularity (byte/page units)*/ }, 1375 /* Null Descriptor - overwritten by call gate */ 1376{ 0x0, /* segment base address */ 1377 0x0, /* length - all address space */ 1378 0, /* segment type */ 1379 0, /* segment descriptor priority level */ 1380 0, /* segment descriptor present */ 1381 0, 0, 1382 0, /* default 32 vs 16 bit size */ 1383 0 /* limit granularity (byte/page units)*/ }, 1384 /* Data Descriptor for user */ 1385{ 0x0, /* segment base address */ 1386 0xfffff, /* length - all address space */ 1387 SDT_MEMRWA, /* segment type */ 1388 SEL_UPL, /* segment descriptor priority level */ 1389 1, /* segment descriptor present */ 1390 0, 0, 1391 1, /* default 32 vs 16 bit size */ 1392 1 /* limit granularity (byte/page units)*/ }, 1393}; 1394 1395void 1396setidt(idx, func, typ, dpl, selec) 1397 int idx; 1398 inthand_t *func; 1399 int typ; 1400 int dpl; 1401 int selec; 1402{ 1403 struct gate_descriptor *ip; 1404 1405 ip = idt + idx; 1406 ip->gd_looffset = (int)func; 1407 ip->gd_selector = selec; 1408 ip->gd_stkcpy = 0; 1409 ip->gd_xx = 0; 1410 ip->gd_type = typ; 1411 ip->gd_dpl = dpl; 1412 ip->gd_p = 1; 1413 ip->gd_hioffset = ((int)func)>>16 ; 1414} 1415 1416#define IDTVEC(name) __CONCAT(X,name) 1417 1418extern inthand_t 1419 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1420 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1421 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1422 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1423 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1424 1425void 1426sdtossd(sd, ssd) 1427 struct segment_descriptor *sd; 1428 struct soft_segment_descriptor *ssd; 1429{ 1430 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1431 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1432 ssd->ssd_type = sd->sd_type; 1433 ssd->ssd_dpl = sd->sd_dpl; 1434 ssd->ssd_p = sd->sd_p; 1435 ssd->ssd_def32 = sd->sd_def32; 1436 ssd->ssd_gran = sd->sd_gran; 1437} 1438 1439#define PHYSMAP_SIZE (2 * 8) 1440 1441/* 1442 * Populate the (physmap) array with base/bound pairs describing the 1443 * available physical memory in the system, then test this memory and 1444 * build the phys_avail array describing the actually-available memory. 1445 * 1446 * If we cannot accurately determine the physical memory map, then use 1447 * value from the 0xE801 call, and failing that, the RTC. 1448 * 1449 * Total memory size may be set by the kernel environment variable 1450 * hw.physmem or the compile-time define MAXMEM. 1451 */ 1452static void 1453getmemsize(int first) 1454{ 1455 int i, physmap_idx, pa_indx; 1456 u_int basemem, extmem; 1457 struct vm86frame vmf; 1458 struct vm86context vmc; 1459 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1460 pt_entry_t pte; 1461 const char *cp; 1462 struct bios_smap *smap; 1463 1464 bzero(&vmf, sizeof(struct vm86frame)); 1465 bzero(physmap, sizeof(physmap)); 1466 1467 /* 1468 * Perform "base memory" related probes & setup 1469 */ 1470 vm86_intcall(0x12, &vmf); 1471 basemem = vmf.vmf_ax; 1472 if (basemem > 640) { 1473 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1474 basemem); 1475 basemem = 640; 1476 } 1477 1478 /* 1479 * XXX if biosbasemem is now < 640, there is a `hole' 1480 * between the end of base memory and the start of 1481 * ISA memory. The hole may be empty or it may 1482 * contain BIOS code or data. Map it read/write so 1483 * that the BIOS can write to it. (Memory from 0 to 1484 * the physical end of the kernel is mapped read-only 1485 * to begin with and then parts of it are remapped. 1486 * The parts that aren't remapped form holes that 1487 * remain read-only and are unused by the kernel. 1488 * The base memory area is below the physical end of 1489 * the kernel and right now forms a read-only hole. 1490 * The part of it from PAGE_SIZE to 1491 * (trunc_page(biosbasemem * 1024) - 1) will be 1492 * remapped and used by the kernel later.) 1493 * 1494 * This code is similar to the code used in 1495 * pmap_mapdev, but since no memory needs to be 1496 * allocated we simply change the mapping. 1497 */ 1498 for (pa = trunc_page(basemem * 1024); 1499 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1500 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1501 *pte = pa | PG_RW | PG_V; 1502 } 1503 1504 /* 1505 * if basemem != 640, map pages r/w into vm86 page table so 1506 * that the bios can scribble on it. 1507 */ 1508 pte = (pt_entry_t)vm86paddr; 1509 for (i = basemem / 4; i < 160; i++) 1510 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1511 1512 /* 1513 * map page 1 R/W into the kernel page table so we can use it 1514 * as a buffer. The kernel will unmap this page later. 1515 */ 1516 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1517 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1518 1519 /* 1520 * get memory map with INT 15:E820 1521 */ 1522 vmc.npages = 0; 1523 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1524 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1525 1526 physmap_idx = 0; 1527 vmf.vmf_ebx = 0; 1528 do { 1529 vmf.vmf_eax = 0xE820; 1530 vmf.vmf_edx = SMAP_SIG; 1531 vmf.vmf_ecx = sizeof(struct bios_smap); 1532 i = vm86_datacall(0x15, &vmf, &vmc); 1533 if (i || vmf.vmf_eax != SMAP_SIG) 1534 break; 1535 if (boothowto & RB_VERBOSE) 1536 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1537 smap->type, 1538 *(u_int32_t *)((char *)&smap->base + 4), 1539 (u_int32_t)smap->base, 1540 *(u_int32_t *)((char *)&smap->length + 4), 1541 (u_int32_t)smap->length); 1542 1543 if (smap->type != 0x01) 1544 goto next_run; 1545 1546 if (smap->length == 0) 1547 goto next_run; 1548 1549 if (smap->base >= 0xffffffff) { 1550 printf("%uK of memory above 4GB ignored\n", 1551 (u_int)(smap->length / 1024)); 1552 goto next_run; 1553 } 1554 1555 for (i = 0; i <= physmap_idx; i += 2) { 1556 if (smap->base < physmap[i + 1]) { 1557 if (boothowto & RB_VERBOSE) 1558 printf( 1559 "Overlapping or non-montonic memory region, ignoring second region\n"); 1560 goto next_run; 1561 } 1562 } 1563 1564 if (smap->base == physmap[physmap_idx + 1]) { 1565 physmap[physmap_idx + 1] += smap->length; 1566 goto next_run; 1567 } 1568 1569 physmap_idx += 2; 1570 if (physmap_idx == PHYSMAP_SIZE) { 1571 printf( 1572 "Too many segments in the physical address map, giving up\n"); 1573 break; 1574 } 1575 physmap[physmap_idx] = smap->base; 1576 physmap[physmap_idx + 1] = smap->base + smap->length; 1577next_run: 1578 } while (vmf.vmf_ebx != 0); 1579 1580 if (physmap[1] != 0) 1581 goto physmap_done; 1582 1583 /* 1584 * If we failed above, try memory map with INT 15:E801 1585 */ 1586 vmf.vmf_ax = 0xE801; 1587 if (vm86_intcall(0x15, &vmf) == 0) { 1588 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1589 } else { 1590#if 0 1591 vmf.vmf_ah = 0x88; 1592 vm86_intcall(0x15, &vmf); 1593 extmem = vmf.vmf_ax; 1594#else 1595 /* 1596 * Prefer the RTC value for extended memory. 1597 */ 1598 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1599#endif 1600 } 1601 1602 /* 1603 * Special hack for chipsets that still remap the 384k hole when 1604 * there's 16MB of memory - this really confuses people that 1605 * are trying to use bus mastering ISA controllers with the 1606 * "16MB limit"; they only have 16MB, but the remapping puts 1607 * them beyond the limit. 1608 * 1609 * If extended memory is between 15-16MB (16-17MB phys address range), 1610 * chop it to 15MB. 1611 */ 1612 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1613 extmem = 15 * 1024; 1614 1615 physmap[0] = 0; 1616 physmap[1] = basemem * 1024; 1617 physmap_idx = 2; 1618 physmap[physmap_idx] = 0x100000; 1619 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1620 1621physmap_done: 1622 /* 1623 * Now, physmap contains a map of physical memory. 1624 */ 1625 1626#ifdef SMP 1627 /* make hole for AP bootstrap code */ 1628 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1629 1630 /* look for the MP hardware - needed for apic addresses */ 1631 mp_probe(); 1632#endif 1633 1634 /* 1635 * Maxmem isn't the "maximum memory", it's one larger than the 1636 * highest page of the physical address space. It should be 1637 * called something like "Maxphyspage". We may adjust this 1638 * based on ``hw.physmem'' and the results of the memory test. 1639 */ 1640 Maxmem = atop(physmap[physmap_idx + 1]); 1641 1642#ifdef MAXMEM 1643 Maxmem = MAXMEM / 4; 1644#endif 1645 1646 /* 1647 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1648 * for the appropriate modifiers. This overrides MAXMEM. 1649 */ 1650 if ((cp = getenv("hw.physmem")) != NULL) { 1651 u_int64_t AllowMem, sanity; 1652 char *ep; 1653 1654 sanity = AllowMem = strtouq(cp, &ep, 0); 1655 if ((ep != cp) && (*ep != 0)) { 1656 switch(*ep) { 1657 case 'g': 1658 case 'G': 1659 AllowMem <<= 10; 1660 case 'm': 1661 case 'M': 1662 AllowMem <<= 10; 1663 case 'k': 1664 case 'K': 1665 AllowMem <<= 10; 1666 break; 1667 default: 1668 AllowMem = sanity = 0; 1669 } 1670 if (AllowMem < sanity) 1671 AllowMem = 0; 1672 } 1673 if (AllowMem == 0) 1674 printf("Ignoring invalid memory size of '%s'\n", cp); 1675 else 1676 Maxmem = atop(AllowMem); 1677 } 1678 1679 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1680 (boothowto & RB_VERBOSE)) 1681 printf("Physical memory use set to %uK\n", Maxmem * 4); 1682 1683 /* 1684 * If Maxmem has been increased beyond what the system has detected, 1685 * extend the last memory segment to the new limit. 1686 */ 1687 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1688 physmap[physmap_idx + 1] = ptoa(Maxmem); 1689 1690 /* call pmap initialization to make new kernel address space */ 1691 pmap_bootstrap(first, 0); 1692 1693 /* 1694 * Size up each available chunk of physical memory. 1695 */ 1696 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1697 pa_indx = 0; 1698 phys_avail[pa_indx++] = physmap[0]; 1699 phys_avail[pa_indx] = physmap[0]; 1700#if 0 1701 pte = (pt_entry_t)vtopte(KERNBASE); 1702#else 1703 pte = (pt_entry_t)CMAP1; 1704#endif 1705 1706 /* 1707 * physmap is in bytes, so when converting to page boundaries, 1708 * round up the start address and round down the end address. 1709 */ 1710 for (i = 0; i <= physmap_idx; i += 2) { 1711 vm_offset_t end; 1712 1713 end = ptoa(Maxmem); 1714 if (physmap[i + 1] < end) 1715 end = trunc_page(physmap[i + 1]); 1716 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1717 int tmp, page_bad; 1718#if 0 1719 int *ptr = 0; 1720#else 1721 int *ptr = (int *)CADDR1; 1722#endif 1723 1724 /* 1725 * block out kernel memory as not available. 1726 */ 1727 if (pa >= 0x100000 && pa < first) 1728 continue; 1729 1730 page_bad = FALSE; 1731 1732 /* 1733 * map page into kernel: valid, read/write,non-cacheable 1734 */ 1735 *pte = pa | PG_V | PG_RW | PG_N; 1736 invltlb(); 1737 1738 tmp = *(int *)ptr; 1739 /* 1740 * Test for alternating 1's and 0's 1741 */ 1742 *(volatile int *)ptr = 0xaaaaaaaa; 1743 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1744 page_bad = TRUE; 1745 } 1746 /* 1747 * Test for alternating 0's and 1's 1748 */ 1749 *(volatile int *)ptr = 0x55555555; 1750 if (*(volatile int *)ptr != 0x55555555) { 1751 page_bad = TRUE; 1752 } 1753 /* 1754 * Test for all 1's 1755 */ 1756 *(volatile int *)ptr = 0xffffffff; 1757 if (*(volatile int *)ptr != 0xffffffff) { 1758 page_bad = TRUE; 1759 } 1760 /* 1761 * Test for all 0's 1762 */ 1763 *(volatile int *)ptr = 0x0; 1764 if (*(volatile int *)ptr != 0x0) { 1765 page_bad = TRUE; 1766 } 1767 /* 1768 * Restore original value. 1769 */ 1770 *(int *)ptr = tmp; 1771 1772 /* 1773 * Adjust array of valid/good pages. 1774 */ 1775 if (page_bad == TRUE) { 1776 continue; 1777 } 1778 /* 1779 * If this good page is a continuation of the 1780 * previous set of good pages, then just increase 1781 * the end pointer. Otherwise start a new chunk. 1782 * Note that "end" points one higher than end, 1783 * making the range >= start and < end. 1784 * If we're also doing a speculative memory 1785 * test and we at or past the end, bump up Maxmem 1786 * so that we keep going. The first bad page 1787 * will terminate the loop. 1788 */ 1789 if (phys_avail[pa_indx] == pa) { 1790 phys_avail[pa_indx] += PAGE_SIZE; 1791 } else { 1792 pa_indx++; 1793 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1794 printf("Too many holes in the physical address space, giving up\n"); 1795 pa_indx--; 1796 break; 1797 } 1798 phys_avail[pa_indx++] = pa; /* start */ 1799 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1800 } 1801 physmem++; 1802 } 1803 } 1804 *pte = 0; 1805 invltlb(); 1806 1807 /* 1808 * XXX 1809 * The last chunk must contain at least one page plus the message 1810 * buffer to avoid complicating other code (message buffer address 1811 * calculation, etc.). 1812 */ 1813 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1814 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1815 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1816 phys_avail[pa_indx--] = 0; 1817 phys_avail[pa_indx--] = 0; 1818 } 1819 1820 Maxmem = atop(phys_avail[pa_indx]); 1821 1822 /* Trim off space for the message buffer. */ 1823 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1824 1825 avail_end = phys_avail[pa_indx]; 1826} 1827 1828void 1829init386(first) 1830 int first; 1831{ 1832 int x; 1833 struct gate_descriptor *gdp; 1834 int gsel_tss; 1835#ifndef SMP 1836 /* table descriptors - used to load tables by microp */ 1837 struct region_descriptor r_gdt, r_idt; 1838#endif 1839 int off; 1840 1841 proc0.p_addr = proc0paddr; 1842 1843 atdevbase = ISA_HOLE_START + KERNBASE; 1844 1845 if (bootinfo.bi_modulep) { 1846 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1847 preload_bootstrap_relocate(KERNBASE); 1848 } else { 1849 printf("WARNING: loader(8) metadata is missing!\n"); 1850 } 1851 if (bootinfo.bi_envp) 1852 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1853 1854 /* 1855 * make gdt memory segments, the code segment goes up to end of the 1856 * page with etext in it, the data segment goes to the end of 1857 * the address space 1858 */ 1859 /* 1860 * XXX text protection is temporarily (?) disabled. The limit was 1861 * i386_btop(round_page(etext)) - 1. 1862 */ 1863 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1864 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1865#ifdef SMP 1866 gdt_segs[GPRIV_SEL].ssd_limit = 1867 i386_btop(sizeof(struct privatespace)) - 1; 1868 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1869 gdt_segs[GPROC0_SEL].ssd_base = 1870 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1871 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0].globaldata; 1872#else 1873 gdt_segs[GPRIV_SEL].ssd_limit = 1874 i386_btop(sizeof(struct globaldata)) - 1; 1875 gdt_segs[GPRIV_SEL].ssd_base = (int) &__globaldata; 1876 gdt_segs[GPROC0_SEL].ssd_base = 1877 (int) &__globaldata.gd_common_tss; 1878 __globaldata.gd_prvspace = &__globaldata; 1879#endif 1880 1881 for (x = 0; x < NGDT; x++) { 1882#ifdef BDE_DEBUGGER 1883 /* avoid overwriting db entries with APM ones */ 1884 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1885 continue; 1886#endif 1887 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1888 } 1889 1890 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1891 r_gdt.rd_base = (int) gdt; 1892 lgdt(&r_gdt); 1893 1894 /* setup curproc so that mutexes work */ 1895 PCPU_SET(curproc, &proc0); 1896 1897 LIST_INIT(&proc0.p_heldmtx); 1898 LIST_INIT(&proc0.p_contested); 1899 1900 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1901#ifdef SMP 1902 /* 1903 * Interrupts can happen very early, so initialize imen_mtx here, rather 1904 * than in init_locks(). 1905 */ 1906 mtx_init(&imen_mtx, "imen", MTX_SPIN); 1907#endif 1908 1909 /* 1910 * Giant is used early for at least debugger traps and unexpected traps. 1911 */ 1912 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1913 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1914 mtx_lock(&Giant); 1915 1916 /* make ldt memory segments */ 1917 /* 1918 * The data segment limit must not cover the user area because we 1919 * don't want the user area to be writable in copyout() etc. (page 1920 * level protection is lost in kernel mode on 386's). Also, we 1921 * don't want the user area to be writable directly (page level 1922 * protection of the user area is not available on 486's with 1923 * CR0_WP set, because there is no user-read/kernel-write mode). 1924 * 1925 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1926 * should be spelled ...MAX_USER... 1927 */ 1928#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1929 /* 1930 * The code segment limit has to cover the user area until we move 1931 * the signal trampoline out of the user area. This is safe because 1932 * the code segment cannot be written to directly. 1933 */ 1934#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1935 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1936 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1937 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1938 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1939 1940 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1941 lldt(_default_ldt); 1942#ifdef USER_LDT 1943 PCPU_SET(currentldt, _default_ldt); 1944#endif 1945 1946 /* exceptions */ 1947 for (x = 0; x < NIDT; x++) 1948 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1949 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1950 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1951 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1952 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1953 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1954 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1955 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1956 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1957 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1958 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1959 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1960 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1961 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1962 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1963 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1964 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1965 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1966 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1967 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1968 setidt(0x80, &IDTVEC(int0x80_syscall), 1969 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1970 1971 r_idt.rd_limit = sizeof(idt0) - 1; 1972 r_idt.rd_base = (int) idt; 1973 lidt(&r_idt); 1974 1975 /* 1976 * We need this mutex before the console probe. 1977 */ 1978 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1979 1980 /* 1981 * Initialize the console before we print anything out. 1982 */ 1983 cninit(); 1984 1985#ifdef DEV_ISA 1986 isa_defaultirq(); 1987#endif 1988 1989#ifdef DDB 1990 kdb_init(); 1991 if (boothowto & RB_KDB) 1992 Debugger("Boot flags requested debugger"); 1993#endif 1994 1995 finishidentcpu(); /* Final stage of CPU initialization */ 1996 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1997 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1998 initializecpu(); /* Initialize CPU registers */ 1999 2000 /* make an initial tss so cpu can get interrupt stack on syscall! */ 2001 PCPU_SET(common_tss.tss_esp0, 2002 (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16); 2003 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 2004 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 2005 private_tss = 0; 2006 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 2007 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 2008 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 2009 ltr(gsel_tss); 2010 2011 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 2012 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 2013 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 2014 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 2015 dblfault_tss.tss_cr3 = (int)IdlePTD; 2016 dblfault_tss.tss_eip = (int) dblfault_handler; 2017 dblfault_tss.tss_eflags = PSL_KERNEL; 2018 dblfault_tss.tss_ds = dblfault_tss.tss_es = 2019 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 2020 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 2021 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 2022 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 2023 2024 vm86_initialize(); 2025 getmemsize(first); 2026 2027 /* now running on new page tables, configured,and u/iom is accessible */ 2028 2029 /* Map the message buffer. */ 2030 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 2031 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 2032 2033 msgbufinit(msgbufp, MSGBUF_SIZE); 2034 2035 /* make a call gate to reenter kernel with */ 2036 gdp = &ldt[LSYS5CALLS_SEL].gd; 2037 2038 x = (int) &IDTVEC(syscall); 2039 gdp->gd_looffset = x++; 2040 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 2041 gdp->gd_stkcpy = 1; 2042 gdp->gd_type = SDT_SYS386CGT; 2043 gdp->gd_dpl = SEL_UPL; 2044 gdp->gd_p = 1; 2045 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 2046 2047 /* XXX does this work? */ 2048 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2049 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2050 2051 /* transfer to user mode */ 2052 2053 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 2054 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 2055 2056 /* setup proc 0's pcb */ 2057 proc0.p_addr->u_pcb.pcb_flags = 0; 2058 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 2059 proc0.p_addr->u_pcb.pcb_ext = 0; 2060 proc0.p_md.md_regs = &proc0_tf; 2061} 2062 2063#if defined(I586_CPU) && !defined(NO_F00F_HACK) 2064static void f00f_hack(void *unused); 2065SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 2066 2067static void 2068f00f_hack(void *unused) { 2069 struct gate_descriptor *new_idt; 2070#ifndef SMP 2071 struct region_descriptor r_idt; 2072#endif 2073 vm_offset_t tmp; 2074 2075 if (!has_f00f_bug) 2076 return; 2077 2078 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2079 2080 r_idt.rd_limit = sizeof(idt0) - 1; 2081 2082 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2083 if (tmp == 0) 2084 panic("kmem_alloc returned 0"); 2085 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2086 panic("kmem_alloc returned non-page-aligned memory"); 2087 /* Put the first seven entries in the lower page */ 2088 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2089 bcopy(idt, new_idt, sizeof(idt0)); 2090 r_idt.rd_base = (int)new_idt; 2091 lidt(&r_idt); 2092 idt = new_idt; 2093 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2094 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2095 panic("vm_map_protect failed"); 2096 return; 2097} 2098#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2099 2100int 2101ptrace_set_pc(p, addr) 2102 struct proc *p; 2103 unsigned long addr; 2104{ 2105 p->p_md.md_regs->tf_eip = addr; 2106 return (0); 2107} 2108 2109int 2110ptrace_single_step(p) 2111 struct proc *p; 2112{ 2113 p->p_md.md_regs->tf_eflags |= PSL_T; 2114 return (0); 2115} 2116 2117int ptrace_read_u_check(p, addr, len) 2118 struct proc *p; 2119 vm_offset_t addr; 2120 size_t len; 2121{ 2122 vm_offset_t gap; 2123 2124 if ((vm_offset_t) (addr + len) < addr) 2125 return EPERM; 2126 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2127 return 0; 2128 2129 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2130 2131 if ((vm_offset_t) addr < gap) 2132 return EPERM; 2133 if ((vm_offset_t) (addr + len) <= 2134 (vm_offset_t) (gap + sizeof(struct trapframe))) 2135 return 0; 2136 return EPERM; 2137} 2138 2139int ptrace_write_u(p, off, data) 2140 struct proc *p; 2141 vm_offset_t off; 2142 long data; 2143{ 2144 struct trapframe frame_copy; 2145 vm_offset_t min; 2146 struct trapframe *tp; 2147 2148 /* 2149 * Privileged kernel state is scattered all over the user area. 2150 * Only allow write access to parts of regs and to fpregs. 2151 */ 2152 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2153 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2154 tp = p->p_md.md_regs; 2155 frame_copy = *tp; 2156 *(int *)((char *)&frame_copy + (off - min)) = data; 2157 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2158 !CS_SECURE(frame_copy.tf_cs)) 2159 return (EINVAL); 2160 *(int*)((char *)p->p_addr + off) = data; 2161 return (0); 2162 } 2163 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2164 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2165 *(int*)((char *)p->p_addr + off) = data; 2166 return (0); 2167 } 2168 return (EFAULT); 2169} 2170 2171int 2172fill_regs(p, regs) 2173 struct proc *p; 2174 struct reg *regs; 2175{ 2176 struct pcb *pcb; 2177 struct trapframe *tp; 2178 2179 tp = p->p_md.md_regs; 2180 regs->r_fs = tp->tf_fs; 2181 regs->r_es = tp->tf_es; 2182 regs->r_ds = tp->tf_ds; 2183 regs->r_edi = tp->tf_edi; 2184 regs->r_esi = tp->tf_esi; 2185 regs->r_ebp = tp->tf_ebp; 2186 regs->r_ebx = tp->tf_ebx; 2187 regs->r_edx = tp->tf_edx; 2188 regs->r_ecx = tp->tf_ecx; 2189 regs->r_eax = tp->tf_eax; 2190 regs->r_eip = tp->tf_eip; 2191 regs->r_cs = tp->tf_cs; 2192 regs->r_eflags = tp->tf_eflags; 2193 regs->r_esp = tp->tf_esp; 2194 regs->r_ss = tp->tf_ss; 2195 pcb = &p->p_addr->u_pcb; 2196 regs->r_gs = pcb->pcb_gs; 2197 return (0); 2198} 2199 2200int 2201set_regs(p, regs) 2202 struct proc *p; 2203 struct reg *regs; 2204{ 2205 struct pcb *pcb; 2206 struct trapframe *tp; 2207 2208 tp = p->p_md.md_regs; 2209 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2210 !CS_SECURE(regs->r_cs)) 2211 return (EINVAL); 2212 tp->tf_fs = regs->r_fs; 2213 tp->tf_es = regs->r_es; 2214 tp->tf_ds = regs->r_ds; 2215 tp->tf_edi = regs->r_edi; 2216 tp->tf_esi = regs->r_esi; 2217 tp->tf_ebp = regs->r_ebp; 2218 tp->tf_ebx = regs->r_ebx; 2219 tp->tf_edx = regs->r_edx; 2220 tp->tf_ecx = regs->r_ecx; 2221 tp->tf_eax = regs->r_eax; 2222 tp->tf_eip = regs->r_eip; 2223 tp->tf_cs = regs->r_cs; 2224 tp->tf_eflags = regs->r_eflags; 2225 tp->tf_esp = regs->r_esp; 2226 tp->tf_ss = regs->r_ss; 2227 pcb = &p->p_addr->u_pcb; 2228 pcb->pcb_gs = regs->r_gs; 2229 return (0); 2230} 2231 2232int 2233fill_fpregs(p, fpregs) 2234 struct proc *p; 2235 struct fpreg *fpregs; 2236{ 2237 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2238 return (0); 2239} 2240 2241int 2242set_fpregs(p, fpregs) 2243 struct proc *p; 2244 struct fpreg *fpregs; 2245{ 2246 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2247 return (0); 2248} 2249 2250int 2251fill_dbregs(p, dbregs) 2252 struct proc *p; 2253 struct dbreg *dbregs; 2254{ 2255 struct pcb *pcb; 2256 2257 pcb = &p->p_addr->u_pcb; 2258 dbregs->dr0 = pcb->pcb_dr0; 2259 dbregs->dr1 = pcb->pcb_dr1; 2260 dbregs->dr2 = pcb->pcb_dr2; 2261 dbregs->dr3 = pcb->pcb_dr3; 2262 dbregs->dr4 = 0; 2263 dbregs->dr5 = 0; 2264 dbregs->dr6 = pcb->pcb_dr6; 2265 dbregs->dr7 = pcb->pcb_dr7; 2266 return (0); 2267} 2268 2269int 2270set_dbregs(p, dbregs) 2271 struct proc *p; 2272 struct dbreg *dbregs; 2273{ 2274 struct pcb *pcb; 2275 int i; 2276 u_int32_t mask1, mask2; 2277 2278 /* 2279 * Don't let an illegal value for dr7 get set. Specifically, 2280 * check for undefined settings. Setting these bit patterns 2281 * result in undefined behaviour and can lead to an unexpected 2282 * TRCTRAP. 2283 */ 2284 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2285 i++, mask1 <<= 2, mask2 <<= 2) 2286 if ((dbregs->dr7 & mask1) == mask2) 2287 return (EINVAL); 2288 2289 if (dbregs->dr7 & 0x0000fc00) 2290 return (EINVAL); 2291 2292 2293 2294 pcb = &p->p_addr->u_pcb; 2295 2296 /* 2297 * Don't let a process set a breakpoint that is not within the 2298 * process's address space. If a process could do this, it 2299 * could halt the system by setting a breakpoint in the kernel 2300 * (if ddb was enabled). Thus, we need to check to make sure 2301 * that no breakpoints are being enabled for addresses outside 2302 * process's address space, unless, perhaps, we were called by 2303 * uid 0. 2304 * 2305 * XXX - what about when the watched area of the user's 2306 * address space is written into from within the kernel 2307 * ... wouldn't that still cause a breakpoint to be generated 2308 * from within kernel mode? 2309 */ 2310 2311 if (suser(p) != 0) { 2312 if (dbregs->dr7 & 0x3) { 2313 /* dr0 is enabled */ 2314 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2315 return (EINVAL); 2316 } 2317 2318 if (dbregs->dr7 & (0x3<<2)) { 2319 /* dr1 is enabled */ 2320 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2321 return (EINVAL); 2322 } 2323 2324 if (dbregs->dr7 & (0x3<<4)) { 2325 /* dr2 is enabled */ 2326 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2327 return (EINVAL); 2328 } 2329 2330 if (dbregs->dr7 & (0x3<<6)) { 2331 /* dr3 is enabled */ 2332 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2333 return (EINVAL); 2334 } 2335 } 2336 2337 pcb->pcb_dr0 = dbregs->dr0; 2338 pcb->pcb_dr1 = dbregs->dr1; 2339 pcb->pcb_dr2 = dbregs->dr2; 2340 pcb->pcb_dr3 = dbregs->dr3; 2341 pcb->pcb_dr6 = dbregs->dr6; 2342 pcb->pcb_dr7 = dbregs->dr7; 2343 2344 pcb->pcb_flags |= PCB_DBREGS; 2345 2346 return (0); 2347} 2348 2349/* 2350 * Return > 0 if a hardware breakpoint has been hit, and the 2351 * breakpoint was in user space. Return 0, otherwise. 2352 */ 2353int 2354user_dbreg_trap(void) 2355{ 2356 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2357 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2358 int nbp; /* number of breakpoints that triggered */ 2359 caddr_t addr[4]; /* breakpoint addresses */ 2360 int i; 2361 2362 dr7 = rdr7(); 2363 if ((dr7 & 0x000000ff) == 0) { 2364 /* 2365 * all GE and LE bits in the dr7 register are zero, 2366 * thus the trap couldn't have been caused by the 2367 * hardware debug registers 2368 */ 2369 return 0; 2370 } 2371 2372 nbp = 0; 2373 dr6 = rdr6(); 2374 bp = dr6 & 0x0000000f; 2375 2376 if (!bp) { 2377 /* 2378 * None of the breakpoint bits are set meaning this 2379 * trap was not caused by any of the debug registers 2380 */ 2381 return 0; 2382 } 2383 2384 /* 2385 * at least one of the breakpoints were hit, check to see 2386 * which ones and if any of them are user space addresses 2387 */ 2388 2389 if (bp & 0x01) { 2390 addr[nbp++] = (caddr_t)rdr0(); 2391 } 2392 if (bp & 0x02) { 2393 addr[nbp++] = (caddr_t)rdr1(); 2394 } 2395 if (bp & 0x04) { 2396 addr[nbp++] = (caddr_t)rdr2(); 2397 } 2398 if (bp & 0x08) { 2399 addr[nbp++] = (caddr_t)rdr3(); 2400 } 2401 2402 for (i=0; i<nbp; i++) { 2403 if (addr[i] < 2404 (caddr_t)VM_MAXUSER_ADDRESS) { 2405 /* 2406 * addr[i] is in user space 2407 */ 2408 return nbp; 2409 } 2410 } 2411 2412 /* 2413 * None of the breakpoints are in user space. 2414 */ 2415 return 0; 2416} 2417 2418 2419#ifndef DDB 2420void 2421Debugger(const char *msg) 2422{ 2423 printf("Debugger(\"%s\") called.\n", msg); 2424} 2425#endif /* no DDB */ 2426 2427#include <sys/disklabel.h> 2428 2429/* 2430 * Determine the size of the transfer, and make sure it is 2431 * within the boundaries of the partition. Adjust transfer 2432 * if needed, and signal errors or early completion. 2433 */ 2434int 2435bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2436{ 2437 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2438 int labelsect = lp->d_partitions[0].p_offset; 2439 int maxsz = p->p_size, 2440 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2441 2442 /* overwriting disk label ? */ 2443 /* XXX should also protect bootstrap in first 8K */ 2444 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2445#if LABELSECTOR != 0 2446 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2447#endif 2448 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2449 bp->bio_error = EROFS; 2450 goto bad; 2451 } 2452 2453#if defined(DOSBBSECTOR) && defined(notyet) 2454 /* overwriting master boot record? */ 2455 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2456 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2457 bp->bio_error = EROFS; 2458 goto bad; 2459 } 2460#endif 2461 2462 /* beyond partition? */ 2463 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2464 /* if exactly at end of disk, return an EOF */ 2465 if (bp->bio_blkno == maxsz) { 2466 bp->bio_resid = bp->bio_bcount; 2467 return(0); 2468 } 2469 /* or truncate if part of it fits */ 2470 sz = maxsz - bp->bio_blkno; 2471 if (sz <= 0) { 2472 bp->bio_error = EINVAL; 2473 goto bad; 2474 } 2475 bp->bio_bcount = sz << DEV_BSHIFT; 2476 } 2477 2478 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2479 return(1); 2480 2481bad: 2482 bp->bio_flags |= BIO_ERROR; 2483 return(-1); 2484} 2485 2486#ifdef DDB 2487 2488/* 2489 * Provide inb() and outb() as functions. They are normally only 2490 * available as macros calling inlined functions, thus cannot be 2491 * called inside DDB. 2492 * 2493 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2494 */ 2495 2496#undef inb 2497#undef outb 2498 2499/* silence compiler warnings */ 2500u_char inb(u_int); 2501void outb(u_int, u_char); 2502 2503u_char 2504inb(u_int port) 2505{ 2506 u_char data; 2507 /* 2508 * We use %%dx and not %1 here because i/o is done at %dx and not at 2509 * %edx, while gcc generates inferior code (movw instead of movl) 2510 * if we tell it to load (u_short) port. 2511 */ 2512 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2513 return (data); 2514} 2515 2516void 2517outb(u_int port, u_char data) 2518{ 2519 u_char al; 2520 /* 2521 * Use an unnecessary assignment to help gcc's register allocator. 2522 * This make a large difference for gcc-1.40 and a tiny difference 2523 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2524 * best results. gcc-2.6.0 can't handle this. 2525 */ 2526 al = data; 2527 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2528} 2529 2530#endif /* DDB */ 2531