machdep.c revision 51834
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 51834 1999-10-01 07:49:37Z marcel $ 39 */ 40 41#include "apm.h" 42#include "ether.h" 43#include "npx.h" 44#include "opt_atalk.h" 45#include "opt_cpu.h" 46#include "opt_ddb.h" 47#include "opt_inet.h" 48#include "opt_ipx.h" 49#include "opt_maxmem.h" 50#include "opt_msgbuf.h" 51#include "opt_perfmon.h" 52#include "opt_smp.h" 53#include "opt_sysvipc.h" 54#include "opt_user_ldt.h" 55#include "opt_userconfig.h" 56 57#include <sys/param.h> 58#include <sys/systm.h> 59#include <sys/sysproto.h> 60#include <sys/signalvar.h> 61#include <sys/kernel.h> 62#include <sys/linker.h> 63#include <sys/proc.h> 64#include <sys/buf.h> 65#include <sys/reboot.h> 66#include <sys/callout.h> 67#include <sys/malloc.h> 68#include <sys/mbuf.h> 69#include <sys/msgbuf.h> 70#include <sys/sysent.h> 71#include <sys/sysctl.h> 72#include <sys/vmmeter.h> 73#include <sys/bus.h> 74 75#ifdef SYSVSHM 76#include <sys/shm.h> 77#endif 78 79#ifdef SYSVMSG 80#include <sys/msg.h> 81#endif 82 83#ifdef SYSVSEM 84#include <sys/sem.h> 85#endif 86 87#include <vm/vm.h> 88#include <vm/vm_param.h> 89#include <vm/vm_prot.h> 90#include <sys/lock.h> 91#include <vm/vm_kern.h> 92#include <vm/vm_object.h> 93#include <vm/vm_page.h> 94#include <vm/vm_map.h> 95#include <vm/vm_pager.h> 96#include <vm/vm_extern.h> 97 98#include <sys/user.h> 99#include <sys/exec.h> 100#include <sys/cons.h> 101 102#include <ddb/ddb.h> 103 104#include <net/netisr.h> 105 106#include <machine/cpu.h> 107#include <machine/reg.h> 108#include <machine/clock.h> 109#include <machine/specialreg.h> 110#include <machine/bootinfo.h> 111#include <machine/ipl.h> 112#include <machine/md_var.h> 113#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 114#ifdef SMP 115#include <machine/smp.h> 116#include <machine/globaldata.h> 117#endif 118#ifdef PERFMON 119#include <machine/perfmon.h> 120#endif 121 122#ifdef OLD_BUS_ARCH 123#include <i386/isa/isa_device.h> 124#endif 125#include <i386/isa/intr_machdep.h> 126#include <isa/rtc.h> 127#include <machine/vm86.h> 128#include <machine/random.h> 129#include <sys/ptrace.h> 130#include <machine/sigframe.h> 131 132extern void init386 __P((int first)); 133extern void dblfault_handler __P((void)); 134 135extern void printcpuinfo(void); /* XXX header file */ 136extern void earlysetcpuclass(void); /* same header file */ 137extern void finishidentcpu(void); 138extern void panicifcpuunsupported(void); 139extern void initializecpu(void); 140 141static void cpu_startup __P((void *)); 142SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 143 144static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf"); 145 146int _udatasel, _ucodesel; 147u_int atdevbase; 148 149#if defined(SWTCH_OPTIM_STATS) 150extern int swtch_optim_stats; 151SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 152 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 153SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 154 CTLFLAG_RD, &tlb_flush_count, 0, ""); 155#endif 156 157#ifdef PC98 158static int ispc98 = 1; 159#else 160static int ispc98 = 0; 161#endif 162SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 163 164int physmem = 0; 165int cold = 1; 166 167static int 168sysctl_hw_physmem SYSCTL_HANDLER_ARGS 169{ 170 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 171 return (error); 172} 173 174SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 175 0, 0, sysctl_hw_physmem, "I", ""); 176 177static int 178sysctl_hw_usermem SYSCTL_HANDLER_ARGS 179{ 180 int error = sysctl_handle_int(oidp, 0, 181 ctob(physmem - cnt.v_wire_count), req); 182 return (error); 183} 184 185SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 186 0, 0, sysctl_hw_usermem, "I", ""); 187 188static int 189sysctl_hw_availpages SYSCTL_HANDLER_ARGS 190{ 191 int error = sysctl_handle_int(oidp, 0, 192 i386_btop(avail_end - avail_start), req); 193 return (error); 194} 195 196SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 197 0, 0, sysctl_hw_availpages, "I", ""); 198 199static int 200sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS 201{ 202 int error; 203 204 /* Unwind the buffer, so that it's linear (possibly starting with 205 * some initial nulls). 206 */ 207 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 208 msgbufp->msg_size-msgbufp->msg_bufr,req); 209 if(error) return(error); 210 if(msgbufp->msg_bufr>0) { 211 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 212 msgbufp->msg_bufr,req); 213 } 214 return(error); 215} 216 217SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 218 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 219 220static int msgbuf_clear; 221 222static int 223sysctl_machdep_msgbuf_clear SYSCTL_HANDLER_ARGS 224{ 225 int error; 226 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 227 req); 228 if (!error && req->newptr) { 229 /* Clear the buffer and reset write pointer */ 230 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 231 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 232 msgbuf_clear=0; 233 } 234 return (error); 235} 236 237SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 238 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 239 "Clear kernel message buffer"); 240 241int bootverbose = 0, Maxmem = 0; 242long dumplo; 243 244vm_offset_t phys_avail[10]; 245 246/* must be 2 less so 0 0 can signal end of chunks */ 247#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 248 249static vm_offset_t buffer_sva, buffer_eva; 250vm_offset_t clean_sva, clean_eva; 251static vm_offset_t pager_sva, pager_eva; 252 253#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 254 255static void 256cpu_startup(dummy) 257 void *dummy; 258{ 259 register unsigned i; 260 register caddr_t v; 261 vm_offset_t maxaddr; 262 vm_size_t size = 0; 263 int firstaddr; 264 vm_offset_t minaddr; 265 266 if (boothowto & RB_VERBOSE) 267 bootverbose++; 268 269 /* 270 * Good {morning,afternoon,evening,night}. 271 */ 272 printf(version); 273 earlysetcpuclass(); 274 startrtclock(); 275 printcpuinfo(); 276 panicifcpuunsupported(); 277#ifdef PERFMON 278 perfmon_init(); 279#endif 280 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 281 /* 282 * Display any holes after the first chunk of extended memory. 283 */ 284 if (bootverbose) { 285 int indx; 286 287 printf("Physical memory chunk(s):\n"); 288 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 289 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 290 291 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 292 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 293 size1 / PAGE_SIZE); 294 } 295 } 296 297 /* 298 * Calculate callout wheel size 299 */ 300 for (callwheelsize = 1, callwheelbits = 0; 301 callwheelsize < ncallout; 302 callwheelsize <<= 1, ++callwheelbits) 303 ; 304 callwheelmask = callwheelsize - 1; 305 306 /* 307 * Allocate space for system data structures. 308 * The first available kernel virtual address is in "v". 309 * As pages of kernel virtual memory are allocated, "v" is incremented. 310 * As pages of memory are allocated and cleared, 311 * "firstaddr" is incremented. 312 * An index into the kernel page table corresponding to the 313 * virtual memory address maintained in "v" is kept in "mapaddr". 314 */ 315 316 /* 317 * Make two passes. The first pass calculates how much memory is 318 * needed and allocates it. The second pass assigns virtual 319 * addresses to the various data structures. 320 */ 321 firstaddr = 0; 322again: 323 v = (caddr_t)firstaddr; 324 325#define valloc(name, type, num) \ 326 (name) = (type *)v; v = (caddr_t)((name)+(num)) 327#define valloclim(name, type, num, lim) \ 328 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 329 330 valloc(callout, struct callout, ncallout); 331 valloc(callwheel, struct callout_tailq, callwheelsize); 332#ifdef SYSVSHM 333 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 334#endif 335#ifdef SYSVSEM 336 valloc(sema, struct semid_ds, seminfo.semmni); 337 valloc(sem, struct sem, seminfo.semmns); 338 /* This is pretty disgusting! */ 339 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 340#endif 341#ifdef SYSVMSG 342 valloc(msgpool, char, msginfo.msgmax); 343 valloc(msgmaps, struct msgmap, msginfo.msgseg); 344 valloc(msghdrs, struct msg, msginfo.msgtql); 345 valloc(msqids, struct msqid_ds, msginfo.msgmni); 346#endif 347 348 if (nbuf == 0) { 349 nbuf = 30; 350 if (physmem > 1024) 351 nbuf += min((physmem - 1024) / 8, 2048); 352 if (physmem > 16384) 353 nbuf += (physmem - 16384) / 20; 354 } 355 nswbuf = max(min(nbuf/4, 256), 16); 356 357 valloc(swbuf, struct buf, nswbuf); 358 valloc(buf, struct buf, nbuf); 359 v = bufhashinit(v); 360 361 /* 362 * End of first pass, size has been calculated so allocate memory 363 */ 364 if (firstaddr == 0) { 365 size = (vm_size_t)(v - firstaddr); 366 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 367 if (firstaddr == 0) 368 panic("startup: no room for tables"); 369 goto again; 370 } 371 372 /* 373 * End of second pass, addresses have been assigned 374 */ 375 if ((vm_size_t)(v - firstaddr) != size) 376 panic("startup: table size inconsistency"); 377 378 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 379 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 380 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 381 (nbuf*BKVASIZE)); 382 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 383 (nswbuf*MAXPHYS) + pager_map_size); 384 pager_map->system_map = 1; 385 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 386 (16*(ARG_MAX+(PAGE_SIZE*3)))); 387 388 /* 389 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 390 * we use the more space efficient malloc in place of kmem_alloc. 391 */ 392 { 393 vm_offset_t mb_map_size; 394 395 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 396 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 397 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 398 bzero(mclrefcnt, mb_map_size / MCLBYTES); 399 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 400 mb_map_size); 401 mb_map->system_map = 1; 402 } 403 404 /* 405 * Initialize callouts 406 */ 407 SLIST_INIT(&callfree); 408 for (i = 0; i < ncallout; i++) { 409 callout_init(&callout[i]); 410 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 411 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 412 } 413 414 for (i = 0; i < callwheelsize; i++) { 415 TAILQ_INIT(&callwheel[i]); 416 } 417 418#if defined(USERCONFIG) 419 userconfig(); 420 cninit(); /* the preferred console may have changed */ 421#endif 422 423 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 424 ptoa(cnt.v_free_count) / 1024); 425 426 /* 427 * Set up buffers, so they can be used to read disk labels. 428 */ 429 bufinit(); 430 vm_pager_bufferinit(); 431 432#ifdef SMP 433 /* 434 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 435 */ 436 mp_start(); /* fire up the APs and APICs */ 437 mp_announce(); 438#endif /* SMP */ 439} 440 441int 442register_netisr(num, handler) 443 int num; 444 netisr_t *handler; 445{ 446 447 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 448 printf("register_netisr: bad isr number: %d\n", num); 449 return (EINVAL); 450 } 451 netisrs[num] = handler; 452 return (0); 453} 454 455void 456netisr_sysinit(data) 457 void *data; 458{ 459 const struct netisrtab *nit; 460 461 nit = (const struct netisrtab *)data; 462 register_netisr(nit->nit_num, nit->nit_isr); 463} 464 465/* 466 * Send an interrupt to process. 467 * 468 * Stack is set up to allow sigcode stored 469 * at top to call routine, followed by kcall 470 * to sigreturn routine below. After sigreturn 471 * resets the signal mask, the stack, and the 472 * frame pointer, it returns to the user 473 * specified pc, psl. 474 */ 475static void 476osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code) 477{ 478 register struct proc *p = curproc; 479 register struct trapframe *regs; 480 register struct osigframe *fp; 481 struct osigframe sf; 482 struct sigacts *psp = p->p_sigacts; 483 int oonstack; 484 485 regs = p->p_md.md_regs; 486 oonstack = (psp->ps_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 487 488 /* Allocate and validate space for the signal handler context. */ 489 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 490 SIGISMEMBER(psp->ps_sigonstack, sig)) { 491 fp = (struct osigframe *)(psp->ps_sigstk.ss_sp + 492 psp->ps_sigstk.ss_size - sizeof(struct osigframe)); 493 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 494 } 495 else 496 fp = (struct osigframe *)regs->tf_esp - 1; 497 498 /* 499 * grow() will return FALSE if the fp will not fit inside the stack 500 * and the stack can not be grown. useracc will return FALSE 501 * if access is denied. 502 */ 503 if (grow_stack(p, (int)fp) == FALSE || 504 useracc((caddr_t)fp, sizeof(struct osigframe), B_WRITE) == FALSE) { 505 /* 506 * Process has trashed its stack; give it an illegal 507 * instruction to halt it in its tracks. 508 */ 509 SIGACTION(p, SIGILL) = SIG_DFL; 510 SIGDELSET(p->p_sigignore, SIGILL); 511 SIGDELSET(p->p_sigcatch, SIGILL); 512 SIGDELSET(p->p_sigmask, SIGILL); 513 psignal(p, SIGILL); 514 return; 515 } 516 517 /* Translate the signal if appropriate */ 518 if (p->p_sysent->sv_sigtbl) { 519 if (sig <= p->p_sysent->sv_sigsize) 520 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 521 } 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 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 527 /* Signal handler installed with SA_SIGINFO. */ 528 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 529 sf.sf_siginfo.si_signo = sig; 530 sf.sf_siginfo.si_code = code; 531 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 532 } 533 else { 534 /* Old FreeBSD-style arguments. */ 535 sf.sf_arg2 = code; 536 sf.sf_ahu.sf_handler = catcher; 537 } 538 539 sf.sf_addr = (char *) regs->tf_err; 540 541 /* save scratch registers */ 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 sigreturn. */ 557 sf.sf_siginfo.si_sc.sc_onstack = oonstack; 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 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 573 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 574 575 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 576 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 577 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 578 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 579 580 if (vm86->vm86_has_vme == 0) 581 sf.sf_siginfo.si_sc.sc_ps = 582 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 583 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 584 /* see sendsig for comment */ 585 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 586 } 587 588 /* Copy the sigframe out to the user's stack. */ 589 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) { 590 /* 591 * Something is wrong with the stack pointer. 592 * ...Kill the process. 593 */ 594 sigexit(p, SIGILL); 595 } 596 597 regs->tf_esp = (int)fp; 598 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 599 regs->tf_cs = _ucodesel; 600 regs->tf_ds = _udatasel; 601 regs->tf_es = _udatasel; 602 regs->tf_fs = _udatasel; 603 regs->tf_ss = _udatasel; 604} 605 606void 607sendsig(catcher, sig, mask, code) 608 sig_t catcher; 609 int sig; 610 sigset_t *mask; 611 u_long code; 612{ 613 struct proc *p; 614 struct trapframe *regs; 615 struct sigacts *psp; 616 struct sigframe sf, *sfp; 617 618 p = curproc; 619 620 if ((p->p_flag & P_NEWSIGSET) == 0) { 621 osendsig(catcher, sig, mask, code); 622 return; 623 } 624 625 regs = p->p_md.md_regs; 626 psp = p->p_sigacts; 627 628 /* save user context */ 629 bzero(&sf, sizeof(struct sigframe)); 630 sf.sf_uc.uc_sigmask = *mask; 631 sf.sf_uc.uc_stack = psp->ps_sigstk; 632 sf.sf_uc.uc_mcontext.mc_tf = *regs; 633 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 634 635 /* Allocate and validate space for the signal handler context. */ 636 if ((psp->ps_flags & SAS_ALTSTACK) != 0 && 637 (psp->ps_sigstk.ss_flags & SS_ONSTACK) == 0 && 638 SIGISMEMBER(psp->ps_sigonstack, sig)) { 639 sfp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 640 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 641 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 642 } 643 else 644 sfp = (struct sigframe *)regs->tf_esp - 1; 645 646 /* 647 * grow() will return FALSE if the sfp will not fit inside the stack 648 * and the stack can not be grown. useracc will return FALSE if 649 * access is denied. 650 */ 651 if (grow_stack(p, (int)sfp) == FALSE || 652 useracc((caddr_t)sfp, sizeof(struct sigframe), B_WRITE) == FALSE) { 653 /* 654 * Process has trashed its stack; give it an illegal 655 * instruction to halt it in its tracks. 656 */ 657#ifdef DEBUG 658 printf("process %d has trashed its stack\n", p->p_pid); 659#endif 660 SIGACTION(p, SIGILL) = SIG_DFL; 661 SIGDELSET(p->p_sigignore, SIGILL); 662 SIGDELSET(p->p_sigcatch, SIGILL); 663 SIGDELSET(p->p_sigmask, SIGILL); 664 psignal(p, SIGILL); 665 return; 666 } 667 668 /* Translate the signal is appropriate */ 669 if (p->p_sysent->sv_sigtbl) { 670 if (sig <= p->p_sysent->sv_sigsize) 671 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 672 } 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 } 687 else { 688 /* Old FreeBSD-style arguments. */ 689 sf.sf_siginfo = code; 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_tf.tf_fs = tf->tf_vm86_fs; 704 sf.sf_uc.uc_mcontext.mc_tf.tf_es = tf->tf_vm86_es; 705 sf.sf_uc.uc_mcontext.mc_tf.tf_ds = tf->tf_vm86_ds; 706 707 if (vm86->vm86_has_vme == 0) 708 sf.sf_uc.uc_mcontext.mc_tf.tf_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 sf.sf_sigreturn = 0x0ABCDEF0; 727 728 /* 729 * Copy the sigframe out to the user's stack. 730 */ 731 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 732 /* 733 * Something is wrong with the stack pointer. 734 * ...Kill the process. 735 */ 736 sigexit(p, SIGILL); 737 } 738 739 regs->tf_esp = (int)sfp; 740 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 741 regs->tf_cs = _ucodesel; 742 regs->tf_ds = _udatasel; 743 regs->tf_es = _udatasel; 744 regs->tf_fs = _udatasel; 745 regs->tf_ss = _udatasel; 746} 747 748/* 749 * System call to cleanup state after a signal 750 * has been taken. Reset signal mask and 751 * stack state from context left by sendsig (above). 752 * Return to previous pc and psl as specified by 753 * context left by sendsig. Check carefully to 754 * make sure that the user has not modified the 755 * state to gain improper privileges. 756 */ 757#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 758#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 759 760int 761osigreturn(p, uap) 762 struct proc *p; 763 struct osigreturn_args /* { 764 struct osigcontext *sigcntxp; 765 } */ *uap; 766{ 767 register struct osigcontext *scp; 768 register struct osigframe *fp; 769 register struct trapframe *regs = p->p_md.md_regs; 770 int eflags; 771 772 /* 773 * (XXX old comment) regs->tf_esp points to the return address. 774 * The user scp pointer is above that. 775 * The return address is faked in the signal trampoline code 776 * for consistency. 777 */ 778 scp = uap->sigcntxp; 779 fp = (struct osigframe *) 780 ((caddr_t)scp - offsetof(struct osigframe, sf_siginfo.si_sc)); 781 782 if (useracc((caddr_t)fp, sizeof (struct osigframe), B_WRITE) == 0) 783 return(EFAULT); 784 785 eflags = scp->sc_ps; 786 if (eflags & PSL_VM) { 787 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 788 struct vm86_kernel *vm86; 789 790 /* 791 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 792 * set up the vm86 area, and we can't enter vm86 mode. 793 */ 794 if (p->p_addr->u_pcb.pcb_ext == 0) 795 return (EINVAL); 796 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 797 if (vm86->vm86_inited == 0) 798 return (EINVAL); 799 800 /* go back to user mode if both flags are set */ 801 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 802 trapsignal(p, SIGBUS, 0); 803 804 if (vm86->vm86_has_vme) { 805 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 806 (eflags & VME_USERCHANGE) | PSL_VM; 807 } else { 808 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 809 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 810 } 811 tf->tf_vm86_ds = scp->sc_ds; 812 tf->tf_vm86_es = scp->sc_es; 813 tf->tf_vm86_fs = scp->sc_fs; 814 tf->tf_vm86_gs = scp->sc_gs; 815 tf->tf_ds = _udatasel; 816 tf->tf_es = _udatasel; 817 tf->tf_fs = _udatasel; 818 } else { 819 /* 820 * Don't allow users to change privileged or reserved flags. 821 */ 822 /* 823 * XXX do allow users to change the privileged flag PSL_RF. 824 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 825 * should sometimes set it there too. tf_eflags is kept in 826 * the signal context during signal handling and there is no 827 * other place to remember it, so the PSL_RF bit may be 828 * corrupted by the signal handler without us knowing. 829 * Corruption of the PSL_RF bit at worst causes one more or 830 * one less debugger trap, so allowing it is fairly harmless. 831 */ 832 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 833 return(EINVAL); 834 } 835 836 /* 837 * Don't allow users to load a valid privileged %cs. Let the 838 * hardware check for invalid selectors, excess privilege in 839 * other selectors, invalid %eip's and invalid %esp's. 840 */ 841 if (!CS_SECURE(scp->sc_cs)) { 842 trapsignal(p, SIGBUS, T_PROTFLT); 843 return(EINVAL); 844 } 845 regs->tf_ds = scp->sc_ds; 846 regs->tf_es = scp->sc_es; 847 regs->tf_fs = scp->sc_fs; 848 } 849 850 /* restore scratch registers */ 851 regs->tf_eax = scp->sc_eax; 852 regs->tf_ebx = scp->sc_ebx; 853 regs->tf_ecx = scp->sc_ecx; 854 regs->tf_edx = scp->sc_edx; 855 regs->tf_esi = scp->sc_esi; 856 regs->tf_edi = scp->sc_edi; 857 regs->tf_cs = scp->sc_cs; 858 regs->tf_ss = scp->sc_ss; 859 regs->tf_isp = scp->sc_isp; 860 861 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 862 return(EINVAL); 863 864 if (scp->sc_onstack & 01) 865 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 866 else 867 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 868 869 OSIG2SIG(scp->sc_mask, p->p_sigmask); 870 SIG_CANTMASK(p->p_sigmask); 871 regs->tf_ebp = scp->sc_fp; 872 regs->tf_esp = scp->sc_sp; 873 regs->tf_eip = scp->sc_pc; 874 regs->tf_eflags = eflags; 875 return(EJUSTRETURN); 876} 877 878int 879sigreturn(p, uap) 880 struct proc *p; 881 struct sigreturn_args /* { 882 ucontext_t *sigcntxp; 883 } */ *uap; 884{ 885 struct trapframe *regs; 886 ucontext_t *ucp; 887 struct sigframe *sfp; 888 int cs, eflags; 889 890 regs = p->p_md.md_regs; 891 ucp = uap->sigcntxp; 892 sfp = (struct sigframe *) 893 ((caddr_t)ucp - offsetof(struct sigframe, sf_uc)); 894 eflags = ucp->uc_mcontext.mc_tf.tf_eflags; 895 896 if (useracc((caddr_t)sfp, sizeof(struct sigframe), B_WRITE) == 0) 897 return(EFAULT); 898 899 if (eflags & PSL_VM) { 900 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 901 struct vm86_kernel *vm86; 902 903 /* 904 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 905 * set up the vm86 area, and we can't enter vm86 mode. 906 */ 907 if (p->p_addr->u_pcb.pcb_ext == 0) 908 return (EINVAL); 909 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 910 if (vm86->vm86_inited == 0) 911 return (EINVAL); 912 913 /* go back to user mode if both flags are set */ 914 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 915 trapsignal(p, SIGBUS, 0); 916 917 if (vm86->vm86_has_vme) { 918 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 919 (eflags & VME_USERCHANGE) | PSL_VM; 920 } else { 921 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 922 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 923 } 924 *regs = ucp->uc_mcontext.mc_tf; 925 tf->tf_vm86_ds = tf->tf_ds; 926 tf->tf_vm86_es = tf->tf_es; 927 tf->tf_vm86_fs = tf->tf_fs; 928 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 929 tf->tf_ds = _udatasel; 930 tf->tf_es = _udatasel; 931 tf->tf_fs = _udatasel; 932 } else { 933 /* 934 * Don't allow users to change privileged or reserved flags. 935 */ 936 /* 937 * XXX do allow users to change the privileged flag PSL_RF. 938 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 939 * should sometimes set it there too. tf_eflags is kept in 940 * the signal context during signal handling and there is no 941 * other place to remember it, so the PSL_RF bit may be 942 * corrupted by the signal handler without us knowing. 943 * Corruption of the PSL_RF bit at worst causes one more or 944 * one less debugger trap, so allowing it is fairly harmless. 945 */ 946 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 947 printf("sigreturn: eflags = 0x%x\n", eflags); 948 return(EINVAL); 949 } 950 951 /* 952 * Don't allow users to load a valid privileged %cs. Let the 953 * hardware check for invalid selectors, excess privilege in 954 * other selectors, invalid %eip's and invalid %esp's. 955 */ 956 cs = ucp->uc_mcontext.mc_tf.tf_cs; 957 if (!CS_SECURE(cs)) { 958 printf("sigreturn: cs = 0x%x\n", cs); 959 trapsignal(p, SIGBUS, T_PROTFLT); 960 return(EINVAL); 961 } 962 963 *regs = ucp->uc_mcontext.mc_tf; 964 } 965 966 p->p_sigacts->ps_sigstk = ucp->uc_stack; 967 p->p_sigmask = ucp->uc_sigmask; 968 SIG_CANTMASK(p->p_sigmask); 969 return(EJUSTRETURN); 970} 971 972/* 973 * Machine dependent boot() routine 974 * 975 * I haven't seen anything to put here yet 976 * Possibly some stuff might be grafted back here from boot() 977 */ 978void 979cpu_boot(int howto) 980{ 981} 982 983/* 984 * Shutdown the CPU as much as possible 985 */ 986void 987cpu_halt(void) 988{ 989 for (;;) 990 __asm__ ("hlt"); 991} 992 993/* 994 * Clear registers on exec 995 */ 996void 997setregs(p, entry, stack, ps_strings) 998 struct proc *p; 999 u_long entry; 1000 u_long stack; 1001 u_long ps_strings; 1002{ 1003 struct trapframe *regs = p->p_md.md_regs; 1004 struct pcb *pcb = &p->p_addr->u_pcb; 1005 1006#ifdef USER_LDT 1007 /* was i386_user_cleanup() in NetBSD */ 1008 if (pcb->pcb_ldt) { 1009 if (pcb == curpcb) { 1010 lldt(_default_ldt); 1011 currentldt = _default_ldt; 1012 } 1013 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 1014 pcb->pcb_ldt_len * sizeof(union descriptor)); 1015 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 1016 } 1017#endif 1018 1019 bzero((char *)regs, sizeof(struct trapframe)); 1020 regs->tf_eip = entry; 1021 regs->tf_esp = stack; 1022 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1023 regs->tf_ss = _udatasel; 1024 regs->tf_ds = _udatasel; 1025 regs->tf_es = _udatasel; 1026 regs->tf_fs = _udatasel; 1027 regs->tf_cs = _ucodesel; 1028 1029 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1030 regs->tf_ebx = ps_strings; 1031 1032 /* reset %gs as well */ 1033 pcb->pcb_gs = _udatasel; 1034 if (pcb == curpcb) { 1035 load_gs(_udatasel); 1036 } 1037 1038 /* 1039 * Initialize the math emulator (if any) for the current process. 1040 * Actually, just clear the bit that says that the emulator has 1041 * been initialized. Initialization is delayed until the process 1042 * traps to the emulator (if it is done at all) mainly because 1043 * emulators don't provide an entry point for initialization. 1044 */ 1045 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1046 1047 /* 1048 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1049 * for why fwait must be trapped at least if there is an npx or an 1050 * emulator). This is mainly to handle the case where npx0 is not 1051 * configured, since the npx routines normally set up the trap 1052 * otherwise. It should be done only at boot time, but doing it 1053 * here allows modifying `npx_exists' for testing the emulator on 1054 * systems with an npx. 1055 */ 1056 load_cr0(rcr0() | CR0_MP | CR0_TS); 1057 1058#if NNPX > 0 1059 /* Initialize the npx (if any) for the current process. */ 1060 npxinit(__INITIAL_NPXCW__); 1061#endif 1062 1063 /* 1064 * XXX - Linux emulator 1065 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1066 * on it. 1067 */ 1068 p->p_retval[1] = 0; 1069} 1070 1071static int 1072sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1073{ 1074 int error; 1075 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1076 req); 1077 if (!error && req->newptr) 1078 resettodr(); 1079 return (error); 1080} 1081 1082SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1083 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1084 1085SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1086 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1087 1088SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1089 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1090 1091SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1092 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1093 1094/* 1095 * Initialize 386 and configure to run kernel 1096 */ 1097 1098/* 1099 * Initialize segments & interrupt table 1100 */ 1101 1102int _default_ldt; 1103#ifdef SMP 1104union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1105#else 1106union descriptor gdt[NGDT]; /* global descriptor table */ 1107#endif 1108static struct gate_descriptor idt0[NIDT]; 1109struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1110union descriptor ldt[NLDT]; /* local descriptor table */ 1111#ifdef SMP 1112/* table descriptors - used to load tables by microp */ 1113struct region_descriptor r_gdt, r_idt; 1114#endif 1115 1116#ifndef SMP 1117extern struct segment_descriptor common_tssd, *tss_gdt; 1118#endif 1119int private_tss; /* flag indicating private tss */ 1120 1121#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1122extern int has_f00f_bug; 1123#endif 1124 1125static struct i386tss dblfault_tss; 1126static char dblfault_stack[PAGE_SIZE]; 1127 1128extern struct user *proc0paddr; 1129 1130 1131/* software prototypes -- in more palatable form */ 1132struct soft_segment_descriptor gdt_segs[] = { 1133/* GNULL_SEL 0 Null Descriptor */ 1134{ 0x0, /* segment base address */ 1135 0x0, /* length */ 1136 0, /* segment type */ 1137 0, /* segment descriptor priority level */ 1138 0, /* segment descriptor present */ 1139 0, 0, 1140 0, /* default 32 vs 16 bit size */ 1141 0 /* limit granularity (byte/page units)*/ }, 1142/* GCODE_SEL 1 Code Descriptor for kernel */ 1143{ 0x0, /* segment base address */ 1144 0xfffff, /* length - all address space */ 1145 SDT_MEMERA, /* segment type */ 1146 0, /* segment descriptor priority level */ 1147 1, /* segment descriptor present */ 1148 0, 0, 1149 1, /* default 32 vs 16 bit size */ 1150 1 /* limit granularity (byte/page units)*/ }, 1151/* GDATA_SEL 2 Data Descriptor for kernel */ 1152{ 0x0, /* segment base address */ 1153 0xfffff, /* length - all address space */ 1154 SDT_MEMRWA, /* segment type */ 1155 0, /* segment descriptor priority level */ 1156 1, /* segment descriptor present */ 1157 0, 0, 1158 1, /* default 32 vs 16 bit size */ 1159 1 /* limit granularity (byte/page units)*/ }, 1160/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1161{ 0x0, /* segment base address */ 1162 0xfffff, /* length - all address space */ 1163 SDT_MEMRWA, /* segment type */ 1164 0, /* segment descriptor priority level */ 1165 1, /* segment descriptor present */ 1166 0, 0, 1167 1, /* default 32 vs 16 bit size */ 1168 1 /* limit granularity (byte/page units)*/ }, 1169/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1170{ 1171 0x0, /* segment base address */ 1172 sizeof(struct i386tss)-1,/* length - all address space */ 1173 SDT_SYS386TSS, /* segment type */ 1174 0, /* segment descriptor priority level */ 1175 1, /* segment descriptor present */ 1176 0, 0, 1177 0, /* unused - default 32 vs 16 bit size */ 1178 0 /* limit granularity (byte/page units)*/ }, 1179/* GLDT_SEL 5 LDT Descriptor */ 1180{ (int) ldt, /* segment base address */ 1181 sizeof(ldt)-1, /* length - all address space */ 1182 SDT_SYSLDT, /* segment type */ 1183 SEL_UPL, /* segment descriptor priority level */ 1184 1, /* segment descriptor present */ 1185 0, 0, 1186 0, /* unused - default 32 vs 16 bit size */ 1187 0 /* limit granularity (byte/page units)*/ }, 1188/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1189{ (int) ldt, /* segment base address */ 1190 (512 * sizeof(union descriptor)-1), /* length */ 1191 SDT_SYSLDT, /* segment type */ 1192 0, /* segment descriptor priority level */ 1193 1, /* segment descriptor present */ 1194 0, 0, 1195 0, /* unused - default 32 vs 16 bit size */ 1196 0 /* limit granularity (byte/page units)*/ }, 1197/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1198{ 0x0, /* segment base address */ 1199 0x0, /* length - all address space */ 1200 0, /* segment type */ 1201 0, /* segment descriptor priority level */ 1202 0, /* segment descriptor present */ 1203 0, 0, 1204 0, /* default 32 vs 16 bit size */ 1205 0 /* limit granularity (byte/page units)*/ }, 1206/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1207{ 0x400, /* segment base address */ 1208 0xfffff, /* length */ 1209 SDT_MEMRWA, /* segment type */ 1210 0, /* segment descriptor priority level */ 1211 1, /* segment descriptor present */ 1212 0, 0, 1213 1, /* default 32 vs 16 bit size */ 1214 1 /* limit granularity (byte/page units)*/ }, 1215/* GPANIC_SEL 9 Panic Tss Descriptor */ 1216{ (int) &dblfault_tss, /* segment base address */ 1217 sizeof(struct i386tss)-1,/* length - all address space */ 1218 SDT_SYS386TSS, /* segment type */ 1219 0, /* segment descriptor priority level */ 1220 1, /* segment descriptor present */ 1221 0, 0, 1222 0, /* unused - default 32 vs 16 bit size */ 1223 0 /* limit granularity (byte/page units)*/ }, 1224/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1225{ 0, /* segment base address (overwritten) */ 1226 0xfffff, /* length */ 1227 SDT_MEMERA, /* segment type */ 1228 0, /* segment descriptor priority level */ 1229 1, /* segment descriptor present */ 1230 0, 0, 1231 0, /* default 32 vs 16 bit size */ 1232 1 /* limit granularity (byte/page units)*/ }, 1233/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1234{ 0, /* segment base address (overwritten) */ 1235 0xfffff, /* length */ 1236 SDT_MEMERA, /* segment type */ 1237 0, /* segment descriptor priority level */ 1238 1, /* segment descriptor present */ 1239 0, 0, 1240 0, /* default 32 vs 16 bit size */ 1241 1 /* limit granularity (byte/page units)*/ }, 1242/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1243{ 0, /* segment base address (overwritten) */ 1244 0xfffff, /* length */ 1245 SDT_MEMRWA, /* segment type */ 1246 0, /* segment descriptor priority level */ 1247 1, /* segment descriptor present */ 1248 0, 0, 1249 1, /* default 32 vs 16 bit size */ 1250 1 /* limit granularity (byte/page units)*/ }, 1251/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1252{ 0, /* segment base address (overwritten) */ 1253 0xfffff, /* length */ 1254 SDT_MEMRWA, /* segment type */ 1255 0, /* segment descriptor priority level */ 1256 1, /* segment descriptor present */ 1257 0, 0, 1258 0, /* default 32 vs 16 bit size */ 1259 1 /* limit granularity (byte/page units)*/ }, 1260/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1261{ 0, /* segment base address (overwritten) */ 1262 0xfffff, /* length */ 1263 SDT_MEMRWA, /* segment type */ 1264 0, /* segment descriptor priority level */ 1265 1, /* segment descriptor present */ 1266 0, 0, 1267 0, /* default 32 vs 16 bit size */ 1268 1 /* limit granularity (byte/page units)*/ }, 1269}; 1270 1271static struct soft_segment_descriptor ldt_segs[] = { 1272 /* Null Descriptor - overwritten by call gate */ 1273{ 0x0, /* segment base address */ 1274 0x0, /* length - all address space */ 1275 0, /* segment type */ 1276 0, /* segment descriptor priority level */ 1277 0, /* segment descriptor present */ 1278 0, 0, 1279 0, /* default 32 vs 16 bit size */ 1280 0 /* limit granularity (byte/page units)*/ }, 1281 /* Null Descriptor - overwritten by call gate */ 1282{ 0x0, /* segment base address */ 1283 0x0, /* length - all address space */ 1284 0, /* segment type */ 1285 0, /* segment descriptor priority level */ 1286 0, /* segment descriptor present */ 1287 0, 0, 1288 0, /* default 32 vs 16 bit size */ 1289 0 /* limit granularity (byte/page units)*/ }, 1290 /* Null Descriptor - overwritten by call gate */ 1291{ 0x0, /* segment base address */ 1292 0x0, /* length - all address space */ 1293 0, /* segment type */ 1294 0, /* segment descriptor priority level */ 1295 0, /* segment descriptor present */ 1296 0, 0, 1297 0, /* default 32 vs 16 bit size */ 1298 0 /* limit granularity (byte/page units)*/ }, 1299 /* Code Descriptor for user */ 1300{ 0x0, /* segment base address */ 1301 0xfffff, /* length - all address space */ 1302 SDT_MEMERA, /* segment type */ 1303 SEL_UPL, /* segment descriptor priority level */ 1304 1, /* segment descriptor present */ 1305 0, 0, 1306 1, /* default 32 vs 16 bit size */ 1307 1 /* limit granularity (byte/page units)*/ }, 1308 /* Null Descriptor - overwritten by call gate */ 1309{ 0x0, /* segment base address */ 1310 0x0, /* length - all address space */ 1311 0, /* segment type */ 1312 0, /* segment descriptor priority level */ 1313 0, /* segment descriptor present */ 1314 0, 0, 1315 0, /* default 32 vs 16 bit size */ 1316 0 /* limit granularity (byte/page units)*/ }, 1317 /* Data Descriptor for user */ 1318{ 0x0, /* segment base address */ 1319 0xfffff, /* length - all address space */ 1320 SDT_MEMRWA, /* segment type */ 1321 SEL_UPL, /* segment descriptor priority level */ 1322 1, /* segment descriptor present */ 1323 0, 0, 1324 1, /* default 32 vs 16 bit size */ 1325 1 /* limit granularity (byte/page units)*/ }, 1326}; 1327 1328void 1329setidt(idx, func, typ, dpl, selec) 1330 int idx; 1331 inthand_t *func; 1332 int typ; 1333 int dpl; 1334 int selec; 1335{ 1336 struct gate_descriptor *ip; 1337 1338 ip = idt + idx; 1339 ip->gd_looffset = (int)func; 1340 ip->gd_selector = selec; 1341 ip->gd_stkcpy = 0; 1342 ip->gd_xx = 0; 1343 ip->gd_type = typ; 1344 ip->gd_dpl = dpl; 1345 ip->gd_p = 1; 1346 ip->gd_hioffset = ((int)func)>>16 ; 1347} 1348 1349#define IDTVEC(name) __CONCAT(X,name) 1350 1351extern inthand_t 1352 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1353 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1354 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1355 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1356 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1357 1358void 1359sdtossd(sd, ssd) 1360 struct segment_descriptor *sd; 1361 struct soft_segment_descriptor *ssd; 1362{ 1363 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1364 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1365 ssd->ssd_type = sd->sd_type; 1366 ssd->ssd_dpl = sd->sd_dpl; 1367 ssd->ssd_p = sd->sd_p; 1368 ssd->ssd_def32 = sd->sd_def32; 1369 ssd->ssd_gran = sd->sd_gran; 1370} 1371 1372#define PHYSMAP_SIZE (2 * 8) 1373 1374/* 1375 * Populate the (physmap) array with base/bound pairs describing the 1376 * available physical memory in the system, then test this memory and 1377 * build the phys_avail array describing the actually-available memory. 1378 * 1379 * If we cannot accurately determine the physical memory map, then use 1380 * value from the 0xE801 call, and failing that, the RTC. 1381 * 1382 * Total memory size may be set by the kernel environment variable 1383 * hw.physmem or the compile-time define MAXMEM. 1384 */ 1385static void 1386getmemsize(int first) 1387{ 1388 int i, physmap_idx, pa_indx; 1389 u_int basemem, extmem; 1390 struct vm86frame vmf; 1391 struct vm86context vmc; 1392 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1393 pt_entry_t pte; 1394 const char *cp; 1395 struct { 1396 u_int64_t base; 1397 u_int64_t length; 1398 u_int32_t type; 1399 } *smap; 1400 1401 bzero(&vmf, sizeof(struct vm86frame)); 1402 bzero(physmap, sizeof(physmap)); 1403 1404 /* 1405 * Perform "base memory" related probes & setup 1406 */ 1407 vm86_intcall(0x12, &vmf); 1408 basemem = vmf.vmf_ax; 1409 if (basemem > 640) { 1410 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1411 basemem); 1412 basemem = 640; 1413 } 1414 1415 /* 1416 * XXX if biosbasemem is now < 640, there is a `hole' 1417 * between the end of base memory and the start of 1418 * ISA memory. The hole may be empty or it may 1419 * contain BIOS code or data. Map it read/write so 1420 * that the BIOS can write to it. (Memory from 0 to 1421 * the physical end of the kernel is mapped read-only 1422 * to begin with and then parts of it are remapped. 1423 * The parts that aren't remapped form holes that 1424 * remain read-only and are unused by the kernel. 1425 * The base memory area is below the physical end of 1426 * the kernel and right now forms a read-only hole. 1427 * The part of it from PAGE_SIZE to 1428 * (trunc_page(biosbasemem * 1024) - 1) will be 1429 * remapped and used by the kernel later.) 1430 * 1431 * This code is similar to the code used in 1432 * pmap_mapdev, but since no memory needs to be 1433 * allocated we simply change the mapping. 1434 */ 1435 for (pa = trunc_page(basemem * 1024); 1436 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1437 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1438 *pte = pa | PG_RW | PG_V; 1439 } 1440 1441 /* 1442 * if basemem != 640, map pages r/w into vm86 page table so 1443 * that the bios can scribble on it. 1444 */ 1445 pte = (pt_entry_t)vm86paddr; 1446 for (i = basemem / 4; i < 160; i++) 1447 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1448 1449 /* 1450 * map page 1 R/W into the kernel page table so we can use it 1451 * as a buffer. The kernel will unmap this page later. 1452 */ 1453 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1454 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1455 1456 /* 1457 * get memory map with INT 15:E820 1458 */ 1459#define SMAPSIZ sizeof(*smap) 1460#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1461 1462 vmc.npages = 0; 1463 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1464 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1465 1466 physmap_idx = 0; 1467 vmf.vmf_ebx = 0; 1468 do { 1469 vmf.vmf_eax = 0xE820; 1470 vmf.vmf_edx = SMAP_SIG; 1471 vmf.vmf_ecx = SMAPSIZ; 1472 i = vm86_datacall(0x15, &vmf, &vmc); 1473 if (i || vmf.vmf_eax != SMAP_SIG) 1474 break; 1475 if (boothowto & RB_VERBOSE) 1476 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1477 smap->type, 1478 *(u_int32_t *)((char *)&smap->base + 4), 1479 (u_int32_t)smap->base, 1480 *(u_int32_t *)((char *)&smap->length + 4), 1481 (u_int32_t)smap->length); 1482 1483 if (smap->type != 0x01) 1484 goto next_run; 1485 1486 if (smap->length == 0) 1487 goto next_run; 1488 1489 if (smap->base >= 0xffffffff) { 1490 printf("%uK of memory above 4GB ignored\n", 1491 (u_int)(smap->length / 1024)); 1492 goto next_run; 1493 } 1494 1495 for (i = 0; i <= physmap_idx; i += 2) { 1496 if (smap->base < physmap[i + 1]) { 1497 if (boothowto & RB_VERBOSE) 1498 printf( 1499 "Overlapping or non-montonic memory region, ignoring second region\n"); 1500 goto next_run; 1501 } 1502 } 1503 1504 if (smap->base == physmap[physmap_idx + 1]) { 1505 physmap[physmap_idx + 1] += smap->length; 1506 goto next_run; 1507 } 1508 1509 physmap_idx += 2; 1510 if (physmap_idx == PHYSMAP_SIZE) { 1511 printf( 1512 "Too many segments in the physical address map, giving up\n"); 1513 break; 1514 } 1515 physmap[physmap_idx] = smap->base; 1516 physmap[physmap_idx + 1] = smap->base + smap->length; 1517next_run: 1518 } while (vmf.vmf_ebx != 0); 1519 1520 if (physmap[1] != 0) 1521 goto physmap_done; 1522 1523 /* 1524 * If we failed above, try memory map with INT 15:E801 1525 */ 1526 vmf.vmf_ax = 0xE801; 1527 if (vm86_intcall(0x15, &vmf) == 0) { 1528 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1529 } else { 1530#if 0 1531 vmf.vmf_ah = 0x88; 1532 vm86_intcall(0x15, &vmf); 1533 extmem = vmf.vmf_ax; 1534#else 1535 /* 1536 * Prefer the RTC value for extended memory. 1537 */ 1538 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1539#endif 1540 } 1541 1542 /* 1543 * Special hack for chipsets that still remap the 384k hole when 1544 * there's 16MB of memory - this really confuses people that 1545 * are trying to use bus mastering ISA controllers with the 1546 * "16MB limit"; they only have 16MB, but the remapping puts 1547 * them beyond the limit. 1548 * 1549 * If extended memory is between 15-16MB (16-17MB phys address range), 1550 * chop it to 15MB. 1551 */ 1552 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1553 extmem = 15 * 1024; 1554 1555 physmap[0] = 0; 1556 physmap[1] = basemem * 1024; 1557 physmap_idx = 2; 1558 physmap[physmap_idx] = 0x100000; 1559 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1560 1561physmap_done: 1562 /* 1563 * Now, physmap contains a map of physical memory. 1564 */ 1565 1566#ifdef SMP 1567 /* make hole for AP bootstrap code */ 1568 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1569 1570 /* look for the MP hardware - needed for apic addresses */ 1571 mp_probe(); 1572#endif 1573 1574 /* 1575 * Maxmem isn't the "maximum memory", it's one larger than the 1576 * highest page of the physical address space. It should be 1577 * called something like "Maxphyspage". We may adjust this 1578 * based on ``hw.physmem'' and the results of the memory test. 1579 */ 1580 Maxmem = atop(physmap[physmap_idx + 1]); 1581 1582#ifdef MAXMEM 1583 Maxmem = MAXMEM / 4; 1584#endif 1585 1586 /* 1587 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1588 * for the appropriate modifiers. This overrides MAXMEM. 1589 */ 1590 if ((cp = getenv("hw.physmem")) != NULL) { 1591 u_int64_t AllowMem, sanity; 1592 const char *ep; 1593 1594 sanity = AllowMem = strtouq(cp, &ep, 0); 1595 if ((ep != cp) && (*ep != 0)) { 1596 switch(*ep) { 1597 case 'g': 1598 case 'G': 1599 AllowMem <<= 10; 1600 case 'm': 1601 case 'M': 1602 AllowMem <<= 10; 1603 case 'k': 1604 case 'K': 1605 AllowMem <<= 10; 1606 break; 1607 default: 1608 AllowMem = sanity = 0; 1609 } 1610 if (AllowMem < sanity) 1611 AllowMem = 0; 1612 } 1613 if (AllowMem == 0) 1614 printf("Ignoring invalid memory size of '%s'\n", cp); 1615 else 1616 Maxmem = atop(AllowMem); 1617 } 1618 1619 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1620 (boothowto & RB_VERBOSE)) 1621 printf("Physical memory use set to %uK\n", Maxmem * 4); 1622 1623 /* 1624 * If Maxmem has been increased beyond what the system has detected, 1625 * extend the last memory segment to the new limit. 1626 */ 1627 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1628 physmap[physmap_idx + 1] = ptoa(Maxmem); 1629 1630 /* call pmap initialization to make new kernel address space */ 1631 pmap_bootstrap(first, 0); 1632 1633 /* 1634 * Size up each available chunk of physical memory. 1635 */ 1636 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1637 pa_indx = 0; 1638 phys_avail[pa_indx++] = physmap[0]; 1639 phys_avail[pa_indx] = physmap[0]; 1640#if 0 1641 pte = (pt_entry_t)vtopte(KERNBASE); 1642#else 1643 pte = (pt_entry_t)CMAP1; 1644#endif 1645 1646 /* 1647 * physmap is in bytes, so when converting to page boundaries, 1648 * round up the start address and round down the end address. 1649 */ 1650 for (i = 0; i <= physmap_idx; i += 2) { 1651 vm_offset_t end; 1652 1653 end = ptoa(Maxmem); 1654 if (physmap[i + 1] < end) 1655 end = trunc_page(physmap[i + 1]); 1656 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1657 int tmp, page_bad; 1658#if 0 1659 int *ptr = 0; 1660#else 1661 int *ptr = (int *)CADDR1; 1662#endif 1663 1664 /* 1665 * block out kernel memory as not available. 1666 */ 1667 if (pa >= 0x100000 && pa < first) 1668 continue; 1669 1670 page_bad = FALSE; 1671 1672 /* 1673 * map page into kernel: valid, read/write,non-cacheable 1674 */ 1675 *pte = pa | PG_V | PG_RW | PG_N; 1676 invltlb(); 1677 1678 tmp = *(int *)ptr; 1679 /* 1680 * Test for alternating 1's and 0's 1681 */ 1682 *(volatile int *)ptr = 0xaaaaaaaa; 1683 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1684 page_bad = TRUE; 1685 } 1686 /* 1687 * Test for alternating 0's and 1's 1688 */ 1689 *(volatile int *)ptr = 0x55555555; 1690 if (*(volatile int *)ptr != 0x55555555) { 1691 page_bad = TRUE; 1692 } 1693 /* 1694 * Test for all 1's 1695 */ 1696 *(volatile int *)ptr = 0xffffffff; 1697 if (*(volatile int *)ptr != 0xffffffff) { 1698 page_bad = TRUE; 1699 } 1700 /* 1701 * Test for all 0's 1702 */ 1703 *(volatile int *)ptr = 0x0; 1704 if (*(volatile int *)ptr != 0x0) { 1705 page_bad = TRUE; 1706 } 1707 /* 1708 * Restore original value. 1709 */ 1710 *(int *)ptr = tmp; 1711 1712 /* 1713 * Adjust array of valid/good pages. 1714 */ 1715 if (page_bad == TRUE) { 1716 continue; 1717 } 1718 /* 1719 * If this good page is a continuation of the 1720 * previous set of good pages, then just increase 1721 * the end pointer. Otherwise start a new chunk. 1722 * Note that "end" points one higher than end, 1723 * making the range >= start and < end. 1724 * If we're also doing a speculative memory 1725 * test and we at or past the end, bump up Maxmem 1726 * so that we keep going. The first bad page 1727 * will terminate the loop. 1728 */ 1729 if (phys_avail[pa_indx] == pa) { 1730 phys_avail[pa_indx] += PAGE_SIZE; 1731 } else { 1732 pa_indx++; 1733 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1734 printf("Too many holes in the physical address space, giving up\n"); 1735 pa_indx--; 1736 break; 1737 } 1738 phys_avail[pa_indx++] = pa; /* start */ 1739 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1740 } 1741 physmem++; 1742 } 1743 } 1744 *pte = 0; 1745 invltlb(); 1746 1747 /* 1748 * XXX 1749 * The last chunk must contain at least one page plus the message 1750 * buffer to avoid complicating other code (message buffer address 1751 * calculation, etc.). 1752 */ 1753 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1754 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1755 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1756 phys_avail[pa_indx--] = 0; 1757 phys_avail[pa_indx--] = 0; 1758 } 1759 1760 Maxmem = atop(phys_avail[pa_indx]); 1761 1762 /* Trim off space for the message buffer. */ 1763 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1764 1765 avail_end = phys_avail[pa_indx]; 1766} 1767 1768void 1769init386(first) 1770 int first; 1771{ 1772 int x; 1773 struct gate_descriptor *gdp; 1774 int gsel_tss; 1775#ifndef SMP 1776 /* table descriptors - used to load tables by microp */ 1777 struct region_descriptor r_gdt, r_idt; 1778#endif 1779 int off; 1780 1781 /* 1782 * Prevent lowering of the ipl if we call tsleep() early. 1783 */ 1784 safepri = cpl; 1785 1786 proc0.p_addr = proc0paddr; 1787 1788 atdevbase = ISA_HOLE_START + KERNBASE; 1789 1790 if (bootinfo.bi_modulep) { 1791 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1792 preload_bootstrap_relocate(KERNBASE); 1793 } 1794 if (bootinfo.bi_envp) 1795 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1796 1797 /* 1798 * make gdt memory segments, the code segment goes up to end of the 1799 * page with etext in it, the data segment goes to the end of 1800 * the address space 1801 */ 1802 /* 1803 * XXX text protection is temporarily (?) disabled. The limit was 1804 * i386_btop(round_page(etext)) - 1. 1805 */ 1806 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1807 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1808#ifdef SMP 1809 gdt_segs[GPRIV_SEL].ssd_limit = 1810 i386_btop(sizeof(struct privatespace)) - 1; 1811 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1812 gdt_segs[GPROC0_SEL].ssd_base = 1813 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1814 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1815#else 1816 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1817 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1818#endif 1819 1820 for (x = 0; x < NGDT; x++) { 1821#ifdef BDE_DEBUGGER 1822 /* avoid overwriting db entries with APM ones */ 1823 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1824 continue; 1825#endif 1826 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1827 } 1828 1829 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1830 r_gdt.rd_base = (int) gdt; 1831 lgdt(&r_gdt); 1832 1833 /* make ldt memory segments */ 1834 /* 1835 * The data segment limit must not cover the user area because we 1836 * don't want the user area to be writable in copyout() etc. (page 1837 * level protection is lost in kernel mode on 386's). Also, we 1838 * don't want the user area to be writable directly (page level 1839 * protection of the user area is not available on 486's with 1840 * CR0_WP set, because there is no user-read/kernel-write mode). 1841 * 1842 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1843 * should be spelled ...MAX_USER... 1844 */ 1845#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1846 /* 1847 * The code segment limit has to cover the user area until we move 1848 * the signal trampoline out of the user area. This is safe because 1849 * the code segment cannot be written to directly. 1850 */ 1851#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1852 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1853 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1854 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1855 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1856 1857 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1858 lldt(_default_ldt); 1859#ifdef USER_LDT 1860 currentldt = _default_ldt; 1861#endif 1862 1863 /* exceptions */ 1864 for (x = 0; x < NIDT; x++) 1865 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1866 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1867 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1868 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1869 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1870 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1871 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1872 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1873 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1874 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1875 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1876 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1877 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1879 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1880 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1881 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1882 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1883 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1884 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1885 setidt(0x80, &IDTVEC(int0x80_syscall), 1886 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1887 1888 r_idt.rd_limit = sizeof(idt0) - 1; 1889 r_idt.rd_base = (int) idt; 1890 lidt(&r_idt); 1891 1892 /* 1893 * Initialize the console before we print anything out. 1894 */ 1895 cninit(); 1896 1897#include "isa.h" 1898#if NISA >0 1899 isa_defaultirq(); 1900#endif 1901 rand_initialize(); 1902 1903#ifdef DDB 1904 kdb_init(); 1905 if (boothowto & RB_KDB) 1906 Debugger("Boot flags requested debugger"); 1907#endif 1908 1909 finishidentcpu(); /* Final stage of CPU initialization */ 1910 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1911 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1912 initializecpu(); /* Initialize CPU registers */ 1913 1914 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1915 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1916 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1917 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1918 private_tss = 0; 1919 tss_gdt = &gdt[GPROC0_SEL].sd; 1920 common_tssd = *tss_gdt; 1921 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1922 ltr(gsel_tss); 1923 1924 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1925 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1926 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1927 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1928 dblfault_tss.tss_cr3 = (int)IdlePTD; 1929 dblfault_tss.tss_eip = (int) dblfault_handler; 1930 dblfault_tss.tss_eflags = PSL_KERNEL; 1931 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1932 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1933 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1934 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1935 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1936 1937 vm86_initialize(); 1938 getmemsize(first); 1939 1940 /* now running on new page tables, configured,and u/iom is accessible */ 1941 1942 /* Map the message buffer. */ 1943 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1944 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1945 1946 msgbufinit(msgbufp, MSGBUF_SIZE); 1947 1948 /* make a call gate to reenter kernel with */ 1949 gdp = &ldt[LSYS5CALLS_SEL].gd; 1950 1951 x = (int) &IDTVEC(syscall); 1952 gdp->gd_looffset = x++; 1953 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1954 gdp->gd_stkcpy = 1; 1955 gdp->gd_type = SDT_SYS386CGT; 1956 gdp->gd_dpl = SEL_UPL; 1957 gdp->gd_p = 1; 1958 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1959 1960 /* XXX does this work? */ 1961 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1962 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1963 1964 /* transfer to user mode */ 1965 1966 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1967 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1968 1969 /* setup proc 0's pcb */ 1970 proc0.p_addr->u_pcb.pcb_flags = 0; 1971 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1972#ifdef SMP 1973 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1974#endif 1975 proc0.p_addr->u_pcb.pcb_ext = 0; 1976} 1977 1978#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1979static void f00f_hack(void *unused); 1980SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1981 1982static void 1983f00f_hack(void *unused) { 1984 struct gate_descriptor *new_idt; 1985#ifndef SMP 1986 struct region_descriptor r_idt; 1987#endif 1988 vm_offset_t tmp; 1989 1990 if (!has_f00f_bug) 1991 return; 1992 1993 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1994 1995 r_idt.rd_limit = sizeof(idt0) - 1; 1996 1997 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1998 if (tmp == 0) 1999 panic("kmem_alloc returned 0"); 2000 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2001 panic("kmem_alloc returned non-page-aligned memory"); 2002 /* Put the first seven entries in the lower page */ 2003 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2004 bcopy(idt, new_idt, sizeof(idt0)); 2005 r_idt.rd_base = (int)new_idt; 2006 lidt(&r_idt); 2007 idt = new_idt; 2008 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2009 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2010 panic("vm_map_protect failed"); 2011 return; 2012} 2013#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2014 2015int 2016ptrace_set_pc(p, addr) 2017 struct proc *p; 2018 unsigned long addr; 2019{ 2020 p->p_md.md_regs->tf_eip = addr; 2021 return (0); 2022} 2023 2024int 2025ptrace_single_step(p) 2026 struct proc *p; 2027{ 2028 p->p_md.md_regs->tf_eflags |= PSL_T; 2029 return (0); 2030} 2031 2032int ptrace_read_u_check(p, addr, len) 2033 struct proc *p; 2034 vm_offset_t addr; 2035 size_t len; 2036{ 2037 vm_offset_t gap; 2038 2039 if ((vm_offset_t) (addr + len) < addr) 2040 return EPERM; 2041 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2042 return 0; 2043 2044 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2045 2046 if ((vm_offset_t) addr < gap) 2047 return EPERM; 2048 if ((vm_offset_t) (addr + len) <= 2049 (vm_offset_t) (gap + sizeof(struct trapframe))) 2050 return 0; 2051 return EPERM; 2052} 2053 2054int ptrace_write_u(p, off, data) 2055 struct proc *p; 2056 vm_offset_t off; 2057 long data; 2058{ 2059 struct trapframe frame_copy; 2060 vm_offset_t min; 2061 struct trapframe *tp; 2062 2063 /* 2064 * Privileged kernel state is scattered all over the user area. 2065 * Only allow write access to parts of regs and to fpregs. 2066 */ 2067 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2068 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2069 tp = p->p_md.md_regs; 2070 frame_copy = *tp; 2071 *(int *)((char *)&frame_copy + (off - min)) = data; 2072 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2073 !CS_SECURE(frame_copy.tf_cs)) 2074 return (EINVAL); 2075 *(int*)((char *)p->p_addr + off) = data; 2076 return (0); 2077 } 2078 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2079 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2080 *(int*)((char *)p->p_addr + off) = data; 2081 return (0); 2082 } 2083 return (EFAULT); 2084} 2085 2086int 2087fill_regs(p, regs) 2088 struct proc *p; 2089 struct reg *regs; 2090{ 2091 struct pcb *pcb; 2092 struct trapframe *tp; 2093 2094 tp = p->p_md.md_regs; 2095 regs->r_fs = tp->tf_fs; 2096 regs->r_es = tp->tf_es; 2097 regs->r_ds = tp->tf_ds; 2098 regs->r_edi = tp->tf_edi; 2099 regs->r_esi = tp->tf_esi; 2100 regs->r_ebp = tp->tf_ebp; 2101 regs->r_ebx = tp->tf_ebx; 2102 regs->r_edx = tp->tf_edx; 2103 regs->r_ecx = tp->tf_ecx; 2104 regs->r_eax = tp->tf_eax; 2105 regs->r_eip = tp->tf_eip; 2106 regs->r_cs = tp->tf_cs; 2107 regs->r_eflags = tp->tf_eflags; 2108 regs->r_esp = tp->tf_esp; 2109 regs->r_ss = tp->tf_ss; 2110 pcb = &p->p_addr->u_pcb; 2111 regs->r_gs = pcb->pcb_gs; 2112 return (0); 2113} 2114 2115int 2116set_regs(p, regs) 2117 struct proc *p; 2118 struct reg *regs; 2119{ 2120 struct pcb *pcb; 2121 struct trapframe *tp; 2122 2123 tp = p->p_md.md_regs; 2124 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2125 !CS_SECURE(regs->r_cs)) 2126 return (EINVAL); 2127 tp->tf_fs = regs->r_fs; 2128 tp->tf_es = regs->r_es; 2129 tp->tf_ds = regs->r_ds; 2130 tp->tf_edi = regs->r_edi; 2131 tp->tf_esi = regs->r_esi; 2132 tp->tf_ebp = regs->r_ebp; 2133 tp->tf_ebx = regs->r_ebx; 2134 tp->tf_edx = regs->r_edx; 2135 tp->tf_ecx = regs->r_ecx; 2136 tp->tf_eax = regs->r_eax; 2137 tp->tf_eip = regs->r_eip; 2138 tp->tf_cs = regs->r_cs; 2139 tp->tf_eflags = regs->r_eflags; 2140 tp->tf_esp = regs->r_esp; 2141 tp->tf_ss = regs->r_ss; 2142 pcb = &p->p_addr->u_pcb; 2143 pcb->pcb_gs = regs->r_gs; 2144 return (0); 2145} 2146 2147int 2148fill_fpregs(p, fpregs) 2149 struct proc *p; 2150 struct fpreg *fpregs; 2151{ 2152 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2153 return (0); 2154} 2155 2156int 2157set_fpregs(p, fpregs) 2158 struct proc *p; 2159 struct fpreg *fpregs; 2160{ 2161 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2162 return (0); 2163} 2164 2165int 2166fill_dbregs(p, dbregs) 2167 struct proc *p; 2168 struct dbreg *dbregs; 2169{ 2170 struct pcb *pcb; 2171 2172 pcb = &p->p_addr->u_pcb; 2173 dbregs->dr0 = pcb->pcb_dr0; 2174 dbregs->dr1 = pcb->pcb_dr1; 2175 dbregs->dr2 = pcb->pcb_dr2; 2176 dbregs->dr3 = pcb->pcb_dr3; 2177 dbregs->dr4 = 0; 2178 dbregs->dr5 = 0; 2179 dbregs->dr6 = pcb->pcb_dr6; 2180 dbregs->dr7 = pcb->pcb_dr7; 2181 return (0); 2182} 2183 2184int 2185set_dbregs(p, dbregs) 2186 struct proc *p; 2187 struct dbreg *dbregs; 2188{ 2189 struct pcb *pcb; 2190 2191 pcb = &p->p_addr->u_pcb; 2192 2193 /* 2194 * Don't let a process set a breakpoint that is not within the 2195 * process's address space. If a process could do this, it 2196 * could halt the system by setting a breakpoint in the kernel 2197 * (if ddb was enabled). Thus, we need to check to make sure 2198 * that no breakpoints are being enabled for addresses outside 2199 * process's address space, unless, perhaps, we were called by 2200 * uid 0. 2201 * 2202 * XXX - what about when the watched area of the user's 2203 * address space is written into from within the kernel 2204 * ... wouldn't that still cause a breakpoint to be generated 2205 * from within kernel mode? 2206 */ 2207 2208 if (p->p_cred->pc_ucred->cr_uid != 0) { 2209 if (dbregs->dr7 & 0x3) { 2210 /* dr0 is enabled */ 2211 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2212 return (EINVAL); 2213 } 2214 2215 if (dbregs->dr7 & (0x3<<2)) { 2216 /* dr1 is enabled */ 2217 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2218 return (EINVAL); 2219 } 2220 2221 if (dbregs->dr7 & (0x3<<4)) { 2222 /* dr2 is enabled */ 2223 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2224 return (EINVAL); 2225 } 2226 2227 if (dbregs->dr7 & (0x3<<6)) { 2228 /* dr3 is enabled */ 2229 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2230 return (EINVAL); 2231 } 2232 } 2233 2234 pcb->pcb_dr0 = dbregs->dr0; 2235 pcb->pcb_dr1 = dbregs->dr1; 2236 pcb->pcb_dr2 = dbregs->dr2; 2237 pcb->pcb_dr3 = dbregs->dr3; 2238 pcb->pcb_dr6 = dbregs->dr6; 2239 pcb->pcb_dr7 = dbregs->dr7; 2240 2241 pcb->pcb_flags |= PCB_DBREGS; 2242 2243 return (0); 2244} 2245 2246#ifndef DDB 2247void 2248Debugger(const char *msg) 2249{ 2250 printf("Debugger(\"%s\") called.\n", msg); 2251} 2252#endif /* no DDB */ 2253 2254#include <sys/disklabel.h> 2255 2256/* 2257 * Determine the size of the transfer, and make sure it is 2258 * within the boundaries of the partition. Adjust transfer 2259 * if needed, and signal errors or early completion. 2260 */ 2261int 2262bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 2263{ 2264 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 2265 int labelsect = lp->d_partitions[0].p_offset; 2266 int maxsz = p->p_size, 2267 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2268 2269 /* overwriting disk label ? */ 2270 /* XXX should also protect bootstrap in first 8K */ 2271 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 2272#if LABELSECTOR != 0 2273 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2274#endif 2275 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2276 bp->b_error = EROFS; 2277 goto bad; 2278 } 2279 2280#if defined(DOSBBSECTOR) && defined(notyet) 2281 /* overwriting master boot record? */ 2282 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 2283 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2284 bp->b_error = EROFS; 2285 goto bad; 2286 } 2287#endif 2288 2289 /* beyond partition? */ 2290 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 2291 /* if exactly at end of disk, return an EOF */ 2292 if (bp->b_blkno == maxsz) { 2293 bp->b_resid = bp->b_bcount; 2294 return(0); 2295 } 2296 /* or truncate if part of it fits */ 2297 sz = maxsz - bp->b_blkno; 2298 if (sz <= 0) { 2299 bp->b_error = EINVAL; 2300 goto bad; 2301 } 2302 bp->b_bcount = sz << DEV_BSHIFT; 2303 } 2304 2305 bp->b_pblkno = bp->b_blkno + p->p_offset; 2306 return(1); 2307 2308bad: 2309 bp->b_flags |= B_ERROR; 2310 return(-1); 2311} 2312 2313#ifdef DDB 2314 2315/* 2316 * Provide inb() and outb() as functions. They are normally only 2317 * available as macros calling inlined functions, thus cannot be 2318 * called inside DDB. 2319 * 2320 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2321 */ 2322 2323#undef inb 2324#undef outb 2325 2326/* silence compiler warnings */ 2327u_char inb(u_int); 2328void outb(u_int, u_char); 2329 2330u_char 2331inb(u_int port) 2332{ 2333 u_char data; 2334 /* 2335 * We use %%dx and not %1 here because i/o is done at %dx and not at 2336 * %edx, while gcc generates inferior code (movw instead of movl) 2337 * if we tell it to load (u_short) port. 2338 */ 2339 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2340 return (data); 2341} 2342 2343void 2344outb(u_int port, u_char data) 2345{ 2346 u_char al; 2347 /* 2348 * Use an unnecessary assignment to help gcc's register allocator. 2349 * This make a large difference for gcc-1.40 and a tiny difference 2350 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2351 * best results. gcc-2.6.0 can't handle this. 2352 */ 2353 al = data; 2354 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2355} 2356 2357#endif /* DDB */ 2358