machdep.c revision 54188
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 54188 1999-12-06 04:53:08Z luoqi $ 39 */ 40 41#include "apm.h" 42#include "ether.h" 43#include "npx.h" 44#include "opt_atalk.h" 45#include "opt_compat.h" 46#include "opt_cpu.h" 47#include "opt_ddb.h" 48#include "opt_inet.h" 49#include "opt_ipx.h" 50#include "opt_maxmem.h" 51#include "opt_msgbuf.h" 52#include "opt_perfmon.h" 53#include "opt_smp.h" 54#include "opt_sysvipc.h" 55#include "opt_user_ldt.h" 56#include "opt_userconfig.h" 57 58#include <sys/param.h> 59#include <sys/systm.h> 60#include <sys/sysproto.h> 61#include <sys/signalvar.h> 62#include <sys/kernel.h> 63#include <sys/linker.h> 64#include <sys/malloc.h> 65#include <sys/proc.h> 66#include <sys/buf.h> 67#include <sys/reboot.h> 68#include <sys/callout.h> 69#include <sys/mbuf.h> 70#include <sys/msgbuf.h> 71#include <sys/sysent.h> 72#include <sys/sysctl.h> 73#include <sys/vmmeter.h> 74#include <sys/bus.h> 75 76#ifdef SYSVSHM 77#include <sys/shm.h> 78#endif 79 80#ifdef SYSVMSG 81#include <sys/msg.h> 82#endif 83 84#ifdef SYSVSEM 85#include <sys/sem.h> 86#endif 87 88#include <vm/vm.h> 89#include <vm/vm_param.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 = 50; 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 = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 487 488 /* Allocate and validate space for the signal handler context. */ 489 if ((p->p_flag & P_ALTSTACK) && !oonstack && 490 SIGISMEMBER(psp->ps_sigonstack, sig)) { 491 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 492 p->p_sigstk.ss_size - sizeof(struct osigframe)); 493 p->p_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), VM_PROT_WRITE)) { 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_addr = regs->tf_err; 537 sf.sf_ahu.sf_handler = catcher; 538 } 539 540 /* save scratch registers */ 541 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 542 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 543 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 544 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 545 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 546 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 547 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 548 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 549 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 550 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 551 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 552 sf.sf_siginfo.si_sc.sc_gs = rgs(); 553 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 554 555 /* Build the signal context to be used by sigreturn. */ 556 sf.sf_siginfo.si_sc.sc_onstack = oonstack; 557 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 558 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 559 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 560 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 561 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 562 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 563 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 564 565 /* 566 * If we're a vm86 process, we want to save the segment registers. 567 * We also change eflags to be our emulated eflags, not the actual 568 * eflags. 569 */ 570 if (regs->tf_eflags & PSL_VM) { 571 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 572 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 573 574 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 575 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 576 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 577 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 578 579 if (vm86->vm86_has_vme == 0) 580 sf.sf_siginfo.si_sc.sc_ps = 581 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 582 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 583 /* see sendsig for comment */ 584 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 585 } 586 587 /* Copy the sigframe out to the user's stack. */ 588 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) { 589 /* 590 * Something is wrong with the stack pointer. 591 * ...Kill the process. 592 */ 593 sigexit(p, SIGILL); 594 } 595 596 regs->tf_esp = (int)fp; 597 regs->tf_eip = PS_STRINGS - szosigcode; 598 regs->tf_cs = _ucodesel; 599 regs->tf_ds = _udatasel; 600 regs->tf_es = _udatasel; 601 regs->tf_fs = _udatasel; 602 load_gs(_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 = curproc; 614 struct trapframe *regs; 615 struct sigacts *psp = p->p_sigacts; 616 struct sigframe sf, *sfp; 617 int oonstack; 618 619 if (SIGISMEMBER(psp->ps_osigset, sig)) { 620 osendsig(catcher, sig, mask, code); 621 return; 622 } 623 624 regs = p->p_md.md_regs; 625 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 626 627 /* save user context */ 628 bzero(&sf, sizeof(struct sigframe)); 629 sf.sf_uc.uc_sigmask = *mask; 630 sf.sf_uc.uc_stack = p->p_sigstk; 631 sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 632 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 633 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe)); 634 635 /* Allocate and validate space for the signal handler context. */ 636 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 637 SIGISMEMBER(psp->ps_sigonstack, sig)) { 638 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 639 p->p_sigstk.ss_size - sizeof(struct sigframe)); 640 p->p_sigstk.ss_flags |= SS_ONSTACK; 641 } 642 else 643 sfp = (struct sigframe *)regs->tf_esp - 1; 644 645 /* 646 * grow() will return FALSE if the sfp will not fit inside the stack 647 * and the stack can not be grown. useracc will return FALSE if 648 * access is denied. 649 */ 650 if (grow_stack(p, (int)sfp) == FALSE || 651 !useracc((caddr_t)sfp, sizeof(struct sigframe), VM_PROT_WRITE)) { 652 /* 653 * Process has trashed its stack; give it an illegal 654 * instruction to halt it in its tracks. 655 */ 656#ifdef DEBUG 657 printf("process %d has trashed its stack\n", p->p_pid); 658#endif 659 SIGACTION(p, SIGILL) = SIG_DFL; 660 SIGDELSET(p->p_sigignore, SIGILL); 661 SIGDELSET(p->p_sigcatch, SIGILL); 662 SIGDELSET(p->p_sigmask, SIGILL); 663 psignal(p, SIGILL); 664 return; 665 } 666 667 /* Translate the signal is appropriate */ 668 if (p->p_sysent->sv_sigtbl) { 669 if (sig <= p->p_sysent->sv_sigsize) 670 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 671 } 672 673 /* Build the argument list for the signal handler. */ 674 sf.sf_signum = sig; 675 sf.sf_ucontext = (register_t)&sfp->sf_uc; 676 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 677 /* Signal handler installed with SA_SIGINFO. */ 678 sf.sf_siginfo = (register_t)&sfp->sf_si; 679 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 680 681 /* fill siginfo structure */ 682 sf.sf_si.si_signo = sig; 683 sf.sf_si.si_code = code; 684 sf.sf_si.si_addr = (void*)regs->tf_err; 685 } 686 else { 687 /* Old FreeBSD-style arguments. */ 688 sf.sf_siginfo = code; 689 sf.sf_addr = regs->tf_err; 690 sf.sf_ahu.sf_handler = catcher; 691 } 692 693 /* 694 * If we're a vm86 process, we want to save the segment registers. 695 * We also change eflags to be our emulated eflags, not the actual 696 * eflags. 697 */ 698 if (regs->tf_eflags & PSL_VM) { 699 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 700 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 701 702 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 703 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 704 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 705 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 706 707 if (vm86->vm86_has_vme == 0) 708 sf.sf_uc.uc_mcontext.mc_eflags = 709 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 710 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 711 712 /* 713 * We should never have PSL_T set when returning from vm86 714 * mode. It may be set here if we deliver a signal before 715 * getting to vm86 mode, so turn it off. 716 * 717 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 718 * syscalls made by the signal handler. This just avoids 719 * wasting time for our lazy fixup of such faults. PSL_NT 720 * does nothing in vm86 mode, but vm86 programs can set it 721 * almost legitimately in probes for old cpu types. 722 */ 723 tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP); 724 } 725 726 /* 727 * Copy the sigframe out to the user's stack. 728 */ 729 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 730 /* 731 * Something is wrong with the stack pointer. 732 * ...Kill the process. 733 */ 734 sigexit(p, SIGILL); 735 } 736 737 regs->tf_esp = (int)sfp; 738 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 739 regs->tf_cs = _ucodesel; 740 regs->tf_ds = _udatasel; 741 regs->tf_es = _udatasel; 742 regs->tf_fs = _udatasel; 743 load_gs(_udatasel); 744 regs->tf_ss = _udatasel; 745} 746 747/* 748 * System call to cleanup state after a signal 749 * has been taken. Reset signal mask and 750 * stack state from context left by sendsig (above). 751 * Return to previous pc and psl as specified by 752 * context left by sendsig. Check carefully to 753 * make sure that the user has not modified the 754 * state to gain improper privileges. 755 */ 756#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 757#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 758 759int 760osigreturn(p, uap) 761 struct proc *p; 762 struct osigreturn_args /* { 763 struct osigcontext *sigcntxp; 764 } */ *uap; 765{ 766 register struct osigcontext *scp; 767 register struct trapframe *regs = p->p_md.md_regs; 768 int eflags; 769 770 scp = uap->sigcntxp; 771 772 if (!useracc((caddr_t)scp, sizeof (struct osigcontext), VM_PROT_READ)) 773 return(EFAULT); 774 775 eflags = scp->sc_ps; 776 if (eflags & PSL_VM) { 777 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 778 struct vm86_kernel *vm86; 779 780 /* 781 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 782 * set up the vm86 area, and we can't enter vm86 mode. 783 */ 784 if (p->p_addr->u_pcb.pcb_ext == 0) 785 return (EINVAL); 786 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 787 if (vm86->vm86_inited == 0) 788 return (EINVAL); 789 790 /* go back to user mode if both flags are set */ 791 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 792 trapsignal(p, SIGBUS, 0); 793 794 if (vm86->vm86_has_vme) { 795 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 796 (eflags & VME_USERCHANGE) | PSL_VM; 797 } else { 798 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 799 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 800 } 801 tf->tf_vm86_ds = scp->sc_ds; 802 tf->tf_vm86_es = scp->sc_es; 803 tf->tf_vm86_fs = scp->sc_fs; 804 tf->tf_vm86_gs = scp->sc_gs; 805 tf->tf_ds = _udatasel; 806 tf->tf_es = _udatasel; 807 tf->tf_fs = _udatasel; 808 } else { 809 /* 810 * Don't allow users to change privileged or reserved flags. 811 */ 812 /* 813 * XXX do allow users to change the privileged flag PSL_RF. 814 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 815 * should sometimes set it there too. tf_eflags is kept in 816 * the signal context during signal handling and there is no 817 * other place to remember it, so the PSL_RF bit may be 818 * corrupted by the signal handler without us knowing. 819 * Corruption of the PSL_RF bit at worst causes one more or 820 * one less debugger trap, so allowing it is fairly harmless. 821 */ 822 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 823 return(EINVAL); 824 } 825 826 /* 827 * Don't allow users to load a valid privileged %cs. Let the 828 * hardware check for invalid selectors, excess privilege in 829 * other selectors, invalid %eip's and invalid %esp's. 830 */ 831 if (!CS_SECURE(scp->sc_cs)) { 832 trapsignal(p, SIGBUS, T_PROTFLT); 833 return(EINVAL); 834 } 835 regs->tf_ds = scp->sc_ds; 836 regs->tf_es = scp->sc_es; 837 regs->tf_fs = scp->sc_fs; 838 } 839 840 /* restore scratch registers */ 841 regs->tf_eax = scp->sc_eax; 842 regs->tf_ebx = scp->sc_ebx; 843 regs->tf_ecx = scp->sc_ecx; 844 regs->tf_edx = scp->sc_edx; 845 regs->tf_esi = scp->sc_esi; 846 regs->tf_edi = scp->sc_edi; 847 regs->tf_cs = scp->sc_cs; 848 regs->tf_ss = scp->sc_ss; 849 regs->tf_isp = scp->sc_isp; 850 851 if (scp->sc_onstack & 01) 852 p->p_sigstk.ss_flags |= SS_ONSTACK; 853 else 854 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 855 856 SIGSETOLD(p->p_sigmask, scp->sc_mask); 857 SIG_CANTMASK(p->p_sigmask); 858 regs->tf_ebp = scp->sc_fp; 859 regs->tf_esp = scp->sc_sp; 860 regs->tf_eip = scp->sc_pc; 861 regs->tf_eflags = eflags; 862 return(EJUSTRETURN); 863} 864 865int 866sigreturn(p, uap) 867 struct proc *p; 868 struct sigreturn_args /* { 869 ucontext_t *sigcntxp; 870 } */ *uap; 871{ 872 struct trapframe *regs; 873 ucontext_t *ucp; 874 int cs, eflags; 875 876 ucp = uap->sigcntxp; 877 878 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 879 return (EFAULT); 880 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 881 return (osigreturn(p, (struct osigreturn_args *)uap)); 882 883 /* 884 * Since ucp is not an osigcontext but a ucontext_t, we have to 885 * check again if all of it is accessible. A ucontext_t is 886 * much larger, so instead of just checking for the pointer 887 * being valid for the size of an osigcontext, now check for 888 * it being valid for a whole, new-style ucontext_t. 889 */ 890 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ)) 891 return (EFAULT); 892 893 regs = p->p_md.md_regs; 894 eflags = ucp->uc_mcontext.mc_eflags; 895 896 if (eflags & PSL_VM) { 897 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 898 struct vm86_kernel *vm86; 899 900 /* 901 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 902 * set up the vm86 area, and we can't enter vm86 mode. 903 */ 904 if (p->p_addr->u_pcb.pcb_ext == 0) 905 return (EINVAL); 906 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 907 if (vm86->vm86_inited == 0) 908 return (EINVAL); 909 910 /* go back to user mode if both flags are set */ 911 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 912 trapsignal(p, SIGBUS, 0); 913 914 if (vm86->vm86_has_vme) { 915 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 916 (eflags & VME_USERCHANGE) | PSL_VM; 917 } else { 918 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 919 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 920 } 921 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 922 tf->tf_eflags = eflags; 923 tf->tf_vm86_ds = tf->tf_ds; 924 tf->tf_vm86_es = tf->tf_es; 925 tf->tf_vm86_fs = tf->tf_fs; 926 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 927 tf->tf_ds = _udatasel; 928 tf->tf_es = _udatasel; 929 tf->tf_fs = _udatasel; 930 } else { 931 /* 932 * Don't allow users to change privileged or reserved flags. 933 */ 934 /* 935 * XXX do allow users to change the privileged flag PSL_RF. 936 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 937 * should sometimes set it there too. tf_eflags is kept in 938 * the signal context during signal handling and there is no 939 * other place to remember it, so the PSL_RF bit may be 940 * corrupted by the signal handler without us knowing. 941 * Corruption of the PSL_RF bit at worst causes one more or 942 * one less debugger trap, so allowing it is fairly harmless. 943 */ 944 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 945 printf("sigreturn: eflags = 0x%x\n", eflags); 946 return(EINVAL); 947 } 948 949 /* 950 * Don't allow users to load a valid privileged %cs. Let the 951 * hardware check for invalid selectors, excess privilege in 952 * other selectors, invalid %eip's and invalid %esp's. 953 */ 954 cs = ucp->uc_mcontext.mc_cs; 955 if (!CS_SECURE(cs)) { 956 printf("sigreturn: cs = 0x%x\n", cs); 957 trapsignal(p, SIGBUS, T_PROTFLT); 958 return(EINVAL); 959 } 960 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe)); 961 } 962 963 if (ucp->uc_mcontext.mc_onstack & 1) 964 p->p_sigstk.ss_flags |= SS_ONSTACK; 965 else 966 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 967 968 p->p_sigmask = ucp->uc_sigmask; 969 SIG_CANTMASK(p->p_sigmask); 970 return(EJUSTRETURN); 971} 972 973/* 974 * Machine dependent boot() routine 975 * 976 * I haven't seen anything to put here yet 977 * Possibly some stuff might be grafted back here from boot() 978 */ 979void 980cpu_boot(int howto) 981{ 982} 983 984/* 985 * Shutdown the CPU as much as possible 986 */ 987void 988cpu_halt(void) 989{ 990 for (;;) 991 __asm__ ("hlt"); 992} 993 994/* 995 * Clear registers on exec 996 */ 997void 998setregs(p, entry, stack, ps_strings) 999 struct proc *p; 1000 u_long entry; 1001 u_long stack; 1002 u_long ps_strings; 1003{ 1004 struct trapframe *regs = p->p_md.md_regs; 1005 struct pcb *pcb = &p->p_addr->u_pcb; 1006 1007#ifdef USER_LDT 1008 /* was i386_user_cleanup() in NetBSD */ 1009 user_ldt_free(pcb); 1010#endif 1011 1012 bzero((char *)regs, sizeof(struct trapframe)); 1013 regs->tf_eip = entry; 1014 regs->tf_esp = stack; 1015 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1016 regs->tf_ss = _udatasel; 1017 regs->tf_ds = _udatasel; 1018 regs->tf_es = _udatasel; 1019 regs->tf_fs = _udatasel; 1020 regs->tf_cs = _ucodesel; 1021 1022 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1023 regs->tf_ebx = ps_strings; 1024 1025 /* reset %gs as well */ 1026 if (pcb == curpcb) 1027 load_gs(_udatasel); 1028 else 1029 pcb->pcb_gs = _udatasel; 1030 1031 /* 1032 * Initialize the math emulator (if any) for the current process. 1033 * Actually, just clear the bit that says that the emulator has 1034 * been initialized. Initialization is delayed until the process 1035 * traps to the emulator (if it is done at all) mainly because 1036 * emulators don't provide an entry point for initialization. 1037 */ 1038 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1039 1040 /* 1041 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1042 * for why fwait must be trapped at least if there is an npx or an 1043 * emulator). This is mainly to handle the case where npx0 is not 1044 * configured, since the npx routines normally set up the trap 1045 * otherwise. It should be done only at boot time, but doing it 1046 * here allows modifying `npx_exists' for testing the emulator on 1047 * systems with an npx. 1048 */ 1049 load_cr0(rcr0() | CR0_MP | CR0_TS); 1050 1051#if NNPX > 0 1052 /* Initialize the npx (if any) for the current process. */ 1053 npxinit(__INITIAL_NPXCW__); 1054#endif 1055 1056 /* 1057 * XXX - Linux emulator 1058 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1059 * on it. 1060 */ 1061 p->p_retval[1] = 0; 1062} 1063 1064static int 1065sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1066{ 1067 int error; 1068 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1069 req); 1070 if (!error && req->newptr) 1071 resettodr(); 1072 return (error); 1073} 1074 1075SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1076 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1077 1078SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1079 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1080 1081SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1082 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1083 1084SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1085 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1086 1087/* 1088 * Initialize 386 and configure to run kernel 1089 */ 1090 1091/* 1092 * Initialize segments & interrupt table 1093 */ 1094 1095int _default_ldt; 1096#ifdef SMP 1097union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1098#else 1099union descriptor gdt[NGDT]; /* global descriptor table */ 1100#endif 1101static struct gate_descriptor idt0[NIDT]; 1102struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1103union descriptor ldt[NLDT]; /* local descriptor table */ 1104#ifdef SMP 1105/* table descriptors - used to load tables by microp */ 1106struct region_descriptor r_gdt, r_idt; 1107#endif 1108 1109#ifndef SMP 1110extern struct segment_descriptor common_tssd, *tss_gdt; 1111#endif 1112int private_tss; /* flag indicating private tss */ 1113 1114#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1115extern int has_f00f_bug; 1116#endif 1117 1118static struct i386tss dblfault_tss; 1119static char dblfault_stack[PAGE_SIZE]; 1120 1121extern struct user *proc0paddr; 1122 1123 1124/* software prototypes -- in more palatable form */ 1125struct soft_segment_descriptor gdt_segs[] = { 1126/* GNULL_SEL 0 Null Descriptor */ 1127{ 0x0, /* segment base address */ 1128 0x0, /* length */ 1129 0, /* segment type */ 1130 0, /* segment descriptor priority level */ 1131 0, /* segment descriptor present */ 1132 0, 0, 1133 0, /* default 32 vs 16 bit size */ 1134 0 /* limit granularity (byte/page units)*/ }, 1135/* GCODE_SEL 1 Code Descriptor for kernel */ 1136{ 0x0, /* segment base address */ 1137 0xfffff, /* length - all address space */ 1138 SDT_MEMERA, /* segment type */ 1139 0, /* segment descriptor priority level */ 1140 1, /* segment descriptor present */ 1141 0, 0, 1142 1, /* default 32 vs 16 bit size */ 1143 1 /* limit granularity (byte/page units)*/ }, 1144/* GDATA_SEL 2 Data Descriptor for kernel */ 1145{ 0x0, /* segment base address */ 1146 0xfffff, /* length - all address space */ 1147 SDT_MEMRWA, /* segment type */ 1148 0, /* segment descriptor priority level */ 1149 1, /* segment descriptor present */ 1150 0, 0, 1151 1, /* default 32 vs 16 bit size */ 1152 1 /* limit granularity (byte/page units)*/ }, 1153/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1154{ 0x0, /* segment base address */ 1155 0xfffff, /* length - all address space */ 1156 SDT_MEMRWA, /* segment type */ 1157 0, /* segment descriptor priority level */ 1158 1, /* segment descriptor present */ 1159 0, 0, 1160 1, /* default 32 vs 16 bit size */ 1161 1 /* limit granularity (byte/page units)*/ }, 1162/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1163{ 1164 0x0, /* segment base address */ 1165 sizeof(struct i386tss)-1,/* length - all address space */ 1166 SDT_SYS386TSS, /* segment type */ 1167 0, /* segment descriptor priority level */ 1168 1, /* segment descriptor present */ 1169 0, 0, 1170 0, /* unused - default 32 vs 16 bit size */ 1171 0 /* limit granularity (byte/page units)*/ }, 1172/* GLDT_SEL 5 LDT Descriptor */ 1173{ (int) ldt, /* segment base address */ 1174 sizeof(ldt)-1, /* length - all address space */ 1175 SDT_SYSLDT, /* segment type */ 1176 SEL_UPL, /* segment descriptor priority level */ 1177 1, /* segment descriptor present */ 1178 0, 0, 1179 0, /* unused - default 32 vs 16 bit size */ 1180 0 /* limit granularity (byte/page units)*/ }, 1181/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1182{ (int) ldt, /* segment base address */ 1183 (512 * sizeof(union descriptor)-1), /* length */ 1184 SDT_SYSLDT, /* segment type */ 1185 0, /* segment descriptor priority level */ 1186 1, /* segment descriptor present */ 1187 0, 0, 1188 0, /* unused - default 32 vs 16 bit size */ 1189 0 /* limit granularity (byte/page units)*/ }, 1190/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1191{ 0x0, /* segment base address */ 1192 0x0, /* length - all address space */ 1193 0, /* segment type */ 1194 0, /* segment descriptor priority level */ 1195 0, /* segment descriptor present */ 1196 0, 0, 1197 0, /* default 32 vs 16 bit size */ 1198 0 /* limit granularity (byte/page units)*/ }, 1199/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1200{ 0x400, /* segment base address */ 1201 0xfffff, /* length */ 1202 SDT_MEMRWA, /* segment type */ 1203 0, /* segment descriptor priority level */ 1204 1, /* segment descriptor present */ 1205 0, 0, 1206 1, /* default 32 vs 16 bit size */ 1207 1 /* limit granularity (byte/page units)*/ }, 1208/* GPANIC_SEL 9 Panic Tss Descriptor */ 1209{ (int) &dblfault_tss, /* segment base address */ 1210 sizeof(struct i386tss)-1,/* length - all address space */ 1211 SDT_SYS386TSS, /* segment type */ 1212 0, /* segment descriptor priority level */ 1213 1, /* segment descriptor present */ 1214 0, 0, 1215 0, /* unused - default 32 vs 16 bit size */ 1216 0 /* limit granularity (byte/page units)*/ }, 1217/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1218{ 0, /* segment base address (overwritten) */ 1219 0xfffff, /* length */ 1220 SDT_MEMERA, /* segment type */ 1221 0, /* segment descriptor priority level */ 1222 1, /* segment descriptor present */ 1223 0, 0, 1224 0, /* default 32 vs 16 bit size */ 1225 1 /* limit granularity (byte/page units)*/ }, 1226/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1227{ 0, /* segment base address (overwritten) */ 1228 0xfffff, /* length */ 1229 SDT_MEMERA, /* segment type */ 1230 0, /* segment descriptor priority level */ 1231 1, /* segment descriptor present */ 1232 0, 0, 1233 0, /* default 32 vs 16 bit size */ 1234 1 /* limit granularity (byte/page units)*/ }, 1235/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1236{ 0, /* segment base address (overwritten) */ 1237 0xfffff, /* length */ 1238 SDT_MEMRWA, /* segment type */ 1239 0, /* segment descriptor priority level */ 1240 1, /* segment descriptor present */ 1241 0, 0, 1242 1, /* default 32 vs 16 bit size */ 1243 1 /* limit granularity (byte/page units)*/ }, 1244/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1245{ 0, /* segment base address (overwritten) */ 1246 0xfffff, /* length */ 1247 SDT_MEMRWA, /* segment type */ 1248 0, /* segment descriptor priority level */ 1249 1, /* segment descriptor present */ 1250 0, 0, 1251 0, /* default 32 vs 16 bit size */ 1252 1 /* limit granularity (byte/page units)*/ }, 1253/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1254{ 0, /* segment base address (overwritten) */ 1255 0xfffff, /* length */ 1256 SDT_MEMRWA, /* segment type */ 1257 0, /* segment descriptor priority level */ 1258 1, /* segment descriptor present */ 1259 0, 0, 1260 0, /* default 32 vs 16 bit size */ 1261 1 /* limit granularity (byte/page units)*/ }, 1262}; 1263 1264static struct soft_segment_descriptor ldt_segs[] = { 1265 /* Null Descriptor - overwritten by call gate */ 1266{ 0x0, /* segment base address */ 1267 0x0, /* length - all address space */ 1268 0, /* segment type */ 1269 0, /* segment descriptor priority level */ 1270 0, /* segment descriptor present */ 1271 0, 0, 1272 0, /* default 32 vs 16 bit size */ 1273 0 /* limit granularity (byte/page units)*/ }, 1274 /* Null Descriptor - overwritten by call gate */ 1275{ 0x0, /* segment base address */ 1276 0x0, /* length - all address space */ 1277 0, /* segment type */ 1278 0, /* segment descriptor priority level */ 1279 0, /* segment descriptor present */ 1280 0, 0, 1281 0, /* default 32 vs 16 bit size */ 1282 0 /* limit granularity (byte/page units)*/ }, 1283 /* Null Descriptor - overwritten by call gate */ 1284{ 0x0, /* segment base address */ 1285 0x0, /* length - all address space */ 1286 0, /* segment type */ 1287 0, /* segment descriptor priority level */ 1288 0, /* segment descriptor present */ 1289 0, 0, 1290 0, /* default 32 vs 16 bit size */ 1291 0 /* limit granularity (byte/page units)*/ }, 1292 /* Code Descriptor for user */ 1293{ 0x0, /* segment base address */ 1294 0xfffff, /* length - all address space */ 1295 SDT_MEMERA, /* segment type */ 1296 SEL_UPL, /* segment descriptor priority level */ 1297 1, /* segment descriptor present */ 1298 0, 0, 1299 1, /* default 32 vs 16 bit size */ 1300 1 /* limit granularity (byte/page units)*/ }, 1301 /* Null Descriptor - overwritten by call gate */ 1302{ 0x0, /* segment base address */ 1303 0x0, /* length - all address space */ 1304 0, /* segment type */ 1305 0, /* segment descriptor priority level */ 1306 0, /* segment descriptor present */ 1307 0, 0, 1308 0, /* default 32 vs 16 bit size */ 1309 0 /* limit granularity (byte/page units)*/ }, 1310 /* Data Descriptor for user */ 1311{ 0x0, /* segment base address */ 1312 0xfffff, /* length - all address space */ 1313 SDT_MEMRWA, /* segment type */ 1314 SEL_UPL, /* segment descriptor priority level */ 1315 1, /* segment descriptor present */ 1316 0, 0, 1317 1, /* default 32 vs 16 bit size */ 1318 1 /* limit granularity (byte/page units)*/ }, 1319}; 1320 1321void 1322setidt(idx, func, typ, dpl, selec) 1323 int idx; 1324 inthand_t *func; 1325 int typ; 1326 int dpl; 1327 int selec; 1328{ 1329 struct gate_descriptor *ip; 1330 1331 ip = idt + idx; 1332 ip->gd_looffset = (int)func; 1333 ip->gd_selector = selec; 1334 ip->gd_stkcpy = 0; 1335 ip->gd_xx = 0; 1336 ip->gd_type = typ; 1337 ip->gd_dpl = dpl; 1338 ip->gd_p = 1; 1339 ip->gd_hioffset = ((int)func)>>16 ; 1340} 1341 1342#define IDTVEC(name) __CONCAT(X,name) 1343 1344extern inthand_t 1345 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1346 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1347 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1348 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1349 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1350 1351void 1352sdtossd(sd, ssd) 1353 struct segment_descriptor *sd; 1354 struct soft_segment_descriptor *ssd; 1355{ 1356 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1357 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1358 ssd->ssd_type = sd->sd_type; 1359 ssd->ssd_dpl = sd->sd_dpl; 1360 ssd->ssd_p = sd->sd_p; 1361 ssd->ssd_def32 = sd->sd_def32; 1362 ssd->ssd_gran = sd->sd_gran; 1363} 1364 1365#define PHYSMAP_SIZE (2 * 8) 1366 1367/* 1368 * Populate the (physmap) array with base/bound pairs describing the 1369 * available physical memory in the system, then test this memory and 1370 * build the phys_avail array describing the actually-available memory. 1371 * 1372 * If we cannot accurately determine the physical memory map, then use 1373 * value from the 0xE801 call, and failing that, the RTC. 1374 * 1375 * Total memory size may be set by the kernel environment variable 1376 * hw.physmem or the compile-time define MAXMEM. 1377 */ 1378static void 1379getmemsize(int first) 1380{ 1381 int i, physmap_idx, pa_indx; 1382 u_int basemem, extmem; 1383 struct vm86frame vmf; 1384 struct vm86context vmc; 1385 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1386 pt_entry_t pte; 1387 const char *cp; 1388 struct { 1389 u_int64_t base; 1390 u_int64_t length; 1391 u_int32_t type; 1392 } *smap; 1393 1394 bzero(&vmf, sizeof(struct vm86frame)); 1395 bzero(physmap, sizeof(physmap)); 1396 1397 /* 1398 * Perform "base memory" related probes & setup 1399 */ 1400 vm86_intcall(0x12, &vmf); 1401 basemem = vmf.vmf_ax; 1402 if (basemem > 640) { 1403 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1404 basemem); 1405 basemem = 640; 1406 } 1407 1408 /* 1409 * XXX if biosbasemem is now < 640, there is a `hole' 1410 * between the end of base memory and the start of 1411 * ISA memory. The hole may be empty or it may 1412 * contain BIOS code or data. Map it read/write so 1413 * that the BIOS can write to it. (Memory from 0 to 1414 * the physical end of the kernel is mapped read-only 1415 * to begin with and then parts of it are remapped. 1416 * The parts that aren't remapped form holes that 1417 * remain read-only and are unused by the kernel. 1418 * The base memory area is below the physical end of 1419 * the kernel and right now forms a read-only hole. 1420 * The part of it from PAGE_SIZE to 1421 * (trunc_page(biosbasemem * 1024) - 1) will be 1422 * remapped and used by the kernel later.) 1423 * 1424 * This code is similar to the code used in 1425 * pmap_mapdev, but since no memory needs to be 1426 * allocated we simply change the mapping. 1427 */ 1428 for (pa = trunc_page(basemem * 1024); 1429 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1430 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1431 *pte = pa | PG_RW | PG_V; 1432 } 1433 1434 /* 1435 * if basemem != 640, map pages r/w into vm86 page table so 1436 * that the bios can scribble on it. 1437 */ 1438 pte = (pt_entry_t)vm86paddr; 1439 for (i = basemem / 4; i < 160; i++) 1440 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1441 1442 /* 1443 * map page 1 R/W into the kernel page table so we can use it 1444 * as a buffer. The kernel will unmap this page later. 1445 */ 1446 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1447 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1448 1449 /* 1450 * get memory map with INT 15:E820 1451 */ 1452#define SMAPSIZ sizeof(*smap) 1453#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1454 1455 vmc.npages = 0; 1456 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1457 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1458 1459 physmap_idx = 0; 1460 vmf.vmf_ebx = 0; 1461 do { 1462 vmf.vmf_eax = 0xE820; 1463 vmf.vmf_edx = SMAP_SIG; 1464 vmf.vmf_ecx = SMAPSIZ; 1465 i = vm86_datacall(0x15, &vmf, &vmc); 1466 if (i || vmf.vmf_eax != SMAP_SIG) 1467 break; 1468 if (boothowto & RB_VERBOSE) 1469 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1470 smap->type, 1471 *(u_int32_t *)((char *)&smap->base + 4), 1472 (u_int32_t)smap->base, 1473 *(u_int32_t *)((char *)&smap->length + 4), 1474 (u_int32_t)smap->length); 1475 1476 if (smap->type != 0x01) 1477 goto next_run; 1478 1479 if (smap->length == 0) 1480 goto next_run; 1481 1482 if (smap->base >= 0xffffffff) { 1483 printf("%uK of memory above 4GB ignored\n", 1484 (u_int)(smap->length / 1024)); 1485 goto next_run; 1486 } 1487 1488 for (i = 0; i <= physmap_idx; i += 2) { 1489 if (smap->base < physmap[i + 1]) { 1490 if (boothowto & RB_VERBOSE) 1491 printf( 1492 "Overlapping or non-montonic memory region, ignoring second region\n"); 1493 goto next_run; 1494 } 1495 } 1496 1497 if (smap->base == physmap[physmap_idx + 1]) { 1498 physmap[physmap_idx + 1] += smap->length; 1499 goto next_run; 1500 } 1501 1502 physmap_idx += 2; 1503 if (physmap_idx == PHYSMAP_SIZE) { 1504 printf( 1505 "Too many segments in the physical address map, giving up\n"); 1506 break; 1507 } 1508 physmap[physmap_idx] = smap->base; 1509 physmap[physmap_idx + 1] = smap->base + smap->length; 1510next_run: 1511 } while (vmf.vmf_ebx != 0); 1512 1513 if (physmap[1] != 0) 1514 goto physmap_done; 1515 1516 /* 1517 * If we failed above, try memory map with INT 15:E801 1518 */ 1519 vmf.vmf_ax = 0xE801; 1520 if (vm86_intcall(0x15, &vmf) == 0) { 1521 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1522 } else { 1523#if 0 1524 vmf.vmf_ah = 0x88; 1525 vm86_intcall(0x15, &vmf); 1526 extmem = vmf.vmf_ax; 1527#else 1528 /* 1529 * Prefer the RTC value for extended memory. 1530 */ 1531 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1532#endif 1533 } 1534 1535 /* 1536 * Special hack for chipsets that still remap the 384k hole when 1537 * there's 16MB of memory - this really confuses people that 1538 * are trying to use bus mastering ISA controllers with the 1539 * "16MB limit"; they only have 16MB, but the remapping puts 1540 * them beyond the limit. 1541 * 1542 * If extended memory is between 15-16MB (16-17MB phys address range), 1543 * chop it to 15MB. 1544 */ 1545 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1546 extmem = 15 * 1024; 1547 1548 physmap[0] = 0; 1549 physmap[1] = basemem * 1024; 1550 physmap_idx = 2; 1551 physmap[physmap_idx] = 0x100000; 1552 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1553 1554physmap_done: 1555 /* 1556 * Now, physmap contains a map of physical memory. 1557 */ 1558 1559#ifdef SMP 1560 /* make hole for AP bootstrap code */ 1561 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1562 1563 /* look for the MP hardware - needed for apic addresses */ 1564 mp_probe(); 1565#endif 1566 1567 /* 1568 * Maxmem isn't the "maximum memory", it's one larger than the 1569 * highest page of the physical address space. It should be 1570 * called something like "Maxphyspage". We may adjust this 1571 * based on ``hw.physmem'' and the results of the memory test. 1572 */ 1573 Maxmem = atop(physmap[physmap_idx + 1]); 1574 1575#ifdef MAXMEM 1576 Maxmem = MAXMEM / 4; 1577#endif 1578 1579 /* 1580 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1581 * for the appropriate modifiers. This overrides MAXMEM. 1582 */ 1583 if ((cp = getenv("hw.physmem")) != NULL) { 1584 u_int64_t AllowMem, sanity; 1585 char *ep; 1586 1587 sanity = AllowMem = strtouq(cp, &ep, 0); 1588 if ((ep != cp) && (*ep != 0)) { 1589 switch(*ep) { 1590 case 'g': 1591 case 'G': 1592 AllowMem <<= 10; 1593 case 'm': 1594 case 'M': 1595 AllowMem <<= 10; 1596 case 'k': 1597 case 'K': 1598 AllowMem <<= 10; 1599 break; 1600 default: 1601 AllowMem = sanity = 0; 1602 } 1603 if (AllowMem < sanity) 1604 AllowMem = 0; 1605 } 1606 if (AllowMem == 0) 1607 printf("Ignoring invalid memory size of '%s'\n", cp); 1608 else 1609 Maxmem = atop(AllowMem); 1610 } 1611 1612 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1613 (boothowto & RB_VERBOSE)) 1614 printf("Physical memory use set to %uK\n", Maxmem * 4); 1615 1616 /* 1617 * If Maxmem has been increased beyond what the system has detected, 1618 * extend the last memory segment to the new limit. 1619 */ 1620 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1621 physmap[physmap_idx + 1] = ptoa(Maxmem); 1622 1623 /* call pmap initialization to make new kernel address space */ 1624 pmap_bootstrap(first, 0); 1625 1626 /* 1627 * Size up each available chunk of physical memory. 1628 */ 1629 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1630 pa_indx = 0; 1631 phys_avail[pa_indx++] = physmap[0]; 1632 phys_avail[pa_indx] = physmap[0]; 1633#if 0 1634 pte = (pt_entry_t)vtopte(KERNBASE); 1635#else 1636 pte = (pt_entry_t)CMAP1; 1637#endif 1638 1639 /* 1640 * physmap is in bytes, so when converting to page boundaries, 1641 * round up the start address and round down the end address. 1642 */ 1643 for (i = 0; i <= physmap_idx; i += 2) { 1644 vm_offset_t end; 1645 1646 end = ptoa(Maxmem); 1647 if (physmap[i + 1] < end) 1648 end = trunc_page(physmap[i + 1]); 1649 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1650 int tmp, page_bad; 1651#if 0 1652 int *ptr = 0; 1653#else 1654 int *ptr = (int *)CADDR1; 1655#endif 1656 1657 /* 1658 * block out kernel memory as not available. 1659 */ 1660 if (pa >= 0x100000 && pa < first) 1661 continue; 1662 1663 page_bad = FALSE; 1664 1665 /* 1666 * map page into kernel: valid, read/write,non-cacheable 1667 */ 1668 *pte = pa | PG_V | PG_RW | PG_N; 1669 invltlb(); 1670 1671 tmp = *(int *)ptr; 1672 /* 1673 * Test for alternating 1's and 0's 1674 */ 1675 *(volatile int *)ptr = 0xaaaaaaaa; 1676 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1677 page_bad = TRUE; 1678 } 1679 /* 1680 * Test for alternating 0's and 1's 1681 */ 1682 *(volatile int *)ptr = 0x55555555; 1683 if (*(volatile int *)ptr != 0x55555555) { 1684 page_bad = TRUE; 1685 } 1686 /* 1687 * Test for all 1's 1688 */ 1689 *(volatile int *)ptr = 0xffffffff; 1690 if (*(volatile int *)ptr != 0xffffffff) { 1691 page_bad = TRUE; 1692 } 1693 /* 1694 * Test for all 0's 1695 */ 1696 *(volatile int *)ptr = 0x0; 1697 if (*(volatile int *)ptr != 0x0) { 1698 page_bad = TRUE; 1699 } 1700 /* 1701 * Restore original value. 1702 */ 1703 *(int *)ptr = tmp; 1704 1705 /* 1706 * Adjust array of valid/good pages. 1707 */ 1708 if (page_bad == TRUE) { 1709 continue; 1710 } 1711 /* 1712 * If this good page is a continuation of the 1713 * previous set of good pages, then just increase 1714 * the end pointer. Otherwise start a new chunk. 1715 * Note that "end" points one higher than end, 1716 * making the range >= start and < end. 1717 * If we're also doing a speculative memory 1718 * test and we at or past the end, bump up Maxmem 1719 * so that we keep going. The first bad page 1720 * will terminate the loop. 1721 */ 1722 if (phys_avail[pa_indx] == pa) { 1723 phys_avail[pa_indx] += PAGE_SIZE; 1724 } else { 1725 pa_indx++; 1726 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1727 printf("Too many holes in the physical address space, giving up\n"); 1728 pa_indx--; 1729 break; 1730 } 1731 phys_avail[pa_indx++] = pa; /* start */ 1732 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1733 } 1734 physmem++; 1735 } 1736 } 1737 *pte = 0; 1738 invltlb(); 1739 1740 /* 1741 * XXX 1742 * The last chunk must contain at least one page plus the message 1743 * buffer to avoid complicating other code (message buffer address 1744 * calculation, etc.). 1745 */ 1746 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1747 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1748 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1749 phys_avail[pa_indx--] = 0; 1750 phys_avail[pa_indx--] = 0; 1751 } 1752 1753 Maxmem = atop(phys_avail[pa_indx]); 1754 1755 /* Trim off space for the message buffer. */ 1756 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1757 1758 avail_end = phys_avail[pa_indx]; 1759} 1760 1761void 1762init386(first) 1763 int first; 1764{ 1765 int x; 1766 struct gate_descriptor *gdp; 1767 int gsel_tss; 1768#ifndef SMP 1769 /* table descriptors - used to load tables by microp */ 1770 struct region_descriptor r_gdt, r_idt; 1771#endif 1772 int off; 1773 1774 /* 1775 * Prevent lowering of the ipl if we call tsleep() early. 1776 */ 1777 safepri = cpl; 1778 1779 proc0.p_addr = proc0paddr; 1780 1781 atdevbase = ISA_HOLE_START + KERNBASE; 1782 1783 if (bootinfo.bi_modulep) { 1784 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1785 preload_bootstrap_relocate(KERNBASE); 1786 } 1787 if (bootinfo.bi_envp) 1788 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1789 1790 /* 1791 * make gdt memory segments, the code segment goes up to end of the 1792 * page with etext in it, the data segment goes to the end of 1793 * the address space 1794 */ 1795 /* 1796 * XXX text protection is temporarily (?) disabled. The limit was 1797 * i386_btop(round_page(etext)) - 1. 1798 */ 1799 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1800 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1801#ifdef SMP 1802 gdt_segs[GPRIV_SEL].ssd_limit = 1803 i386_btop(sizeof(struct privatespace)) - 1; 1804 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1805 gdt_segs[GPROC0_SEL].ssd_base = 1806 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1807 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1808#else 1809 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1810 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1811#endif 1812 1813 for (x = 0; x < NGDT; x++) { 1814#ifdef BDE_DEBUGGER 1815 /* avoid overwriting db entries with APM ones */ 1816 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1817 continue; 1818#endif 1819 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1820 } 1821 1822 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1823 r_gdt.rd_base = (int) gdt; 1824 lgdt(&r_gdt); 1825 1826 /* make ldt memory segments */ 1827 /* 1828 * The data segment limit must not cover the user area because we 1829 * don't want the user area to be writable in copyout() etc. (page 1830 * level protection is lost in kernel mode on 386's). Also, we 1831 * don't want the user area to be writable directly (page level 1832 * protection of the user area is not available on 486's with 1833 * CR0_WP set, because there is no user-read/kernel-write mode). 1834 * 1835 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1836 * should be spelled ...MAX_USER... 1837 */ 1838#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1839 /* 1840 * The code segment limit has to cover the user area until we move 1841 * the signal trampoline out of the user area. This is safe because 1842 * the code segment cannot be written to directly. 1843 */ 1844#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1845 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1846 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1847 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1848 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1849 1850 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1851 lldt(_default_ldt); 1852#ifdef USER_LDT 1853 currentldt = _default_ldt; 1854#endif 1855 1856 /* exceptions */ 1857 for (x = 0; x < NIDT; x++) 1858 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1859 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1860 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1861 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1862 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1863 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1864 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1865 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1866 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1867 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1868 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1869 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1870 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1871 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1872 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1873 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1874 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1875 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1876 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1877 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 setidt(0x80, &IDTVEC(int0x80_syscall), 1879 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1880 1881 r_idt.rd_limit = sizeof(idt0) - 1; 1882 r_idt.rd_base = (int) idt; 1883 lidt(&r_idt); 1884 1885 /* 1886 * Initialize the console before we print anything out. 1887 */ 1888 cninit(); 1889 1890#include "isa.h" 1891#if NISA >0 1892 isa_defaultirq(); 1893#endif 1894 rand_initialize(); 1895 1896#ifdef DDB 1897 kdb_init(); 1898 if (boothowto & RB_KDB) 1899 Debugger("Boot flags requested debugger"); 1900#endif 1901 1902 finishidentcpu(); /* Final stage of CPU initialization */ 1903 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1904 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1905 initializecpu(); /* Initialize CPU registers */ 1906 1907 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1908 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1909 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1910 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1911 private_tss = 0; 1912 tss_gdt = &gdt[GPROC0_SEL].sd; 1913 common_tssd = *tss_gdt; 1914 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1915 ltr(gsel_tss); 1916 1917 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1918 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1919 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1920 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1921 dblfault_tss.tss_cr3 = (int)IdlePTD; 1922 dblfault_tss.tss_eip = (int) dblfault_handler; 1923 dblfault_tss.tss_eflags = PSL_KERNEL; 1924 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1925 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1926 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1927 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1928 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1929 1930 vm86_initialize(); 1931 getmemsize(first); 1932 1933 /* now running on new page tables, configured,and u/iom is accessible */ 1934 1935 /* Map the message buffer. */ 1936 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1937 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1938 1939 msgbufinit(msgbufp, MSGBUF_SIZE); 1940 1941 /* make a call gate to reenter kernel with */ 1942 gdp = &ldt[LSYS5CALLS_SEL].gd; 1943 1944 x = (int) &IDTVEC(syscall); 1945 gdp->gd_looffset = x++; 1946 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1947 gdp->gd_stkcpy = 1; 1948 gdp->gd_type = SDT_SYS386CGT; 1949 gdp->gd_dpl = SEL_UPL; 1950 gdp->gd_p = 1; 1951 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1952 1953 /* XXX does this work? */ 1954 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1955 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1956 1957 /* transfer to user mode */ 1958 1959 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1960 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1961 1962 /* setup proc 0's pcb */ 1963 proc0.p_addr->u_pcb.pcb_flags = 0; 1964 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1965#ifdef SMP 1966 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1967#endif 1968 proc0.p_addr->u_pcb.pcb_ext = 0; 1969} 1970 1971#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1972static void f00f_hack(void *unused); 1973SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1974 1975static void 1976f00f_hack(void *unused) { 1977 struct gate_descriptor *new_idt; 1978#ifndef SMP 1979 struct region_descriptor r_idt; 1980#endif 1981 vm_offset_t tmp; 1982 1983 if (!has_f00f_bug) 1984 return; 1985 1986 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1987 1988 r_idt.rd_limit = sizeof(idt0) - 1; 1989 1990 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1991 if (tmp == 0) 1992 panic("kmem_alloc returned 0"); 1993 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1994 panic("kmem_alloc returned non-page-aligned memory"); 1995 /* Put the first seven entries in the lower page */ 1996 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1997 bcopy(idt, new_idt, sizeof(idt0)); 1998 r_idt.rd_base = (int)new_idt; 1999 lidt(&r_idt); 2000 idt = new_idt; 2001 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2002 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2003 panic("vm_map_protect failed"); 2004 return; 2005} 2006#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2007 2008int 2009ptrace_set_pc(p, addr) 2010 struct proc *p; 2011 unsigned long addr; 2012{ 2013 p->p_md.md_regs->tf_eip = addr; 2014 return (0); 2015} 2016 2017int 2018ptrace_single_step(p) 2019 struct proc *p; 2020{ 2021 p->p_md.md_regs->tf_eflags |= PSL_T; 2022 return (0); 2023} 2024 2025int ptrace_read_u_check(p, addr, len) 2026 struct proc *p; 2027 vm_offset_t addr; 2028 size_t len; 2029{ 2030 vm_offset_t gap; 2031 2032 if ((vm_offset_t) (addr + len) < addr) 2033 return EPERM; 2034 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2035 return 0; 2036 2037 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2038 2039 if ((vm_offset_t) addr < gap) 2040 return EPERM; 2041 if ((vm_offset_t) (addr + len) <= 2042 (vm_offset_t) (gap + sizeof(struct trapframe))) 2043 return 0; 2044 return EPERM; 2045} 2046 2047int ptrace_write_u(p, off, data) 2048 struct proc *p; 2049 vm_offset_t off; 2050 long data; 2051{ 2052 struct trapframe frame_copy; 2053 vm_offset_t min; 2054 struct trapframe *tp; 2055 2056 /* 2057 * Privileged kernel state is scattered all over the user area. 2058 * Only allow write access to parts of regs and to fpregs. 2059 */ 2060 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2061 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2062 tp = p->p_md.md_regs; 2063 frame_copy = *tp; 2064 *(int *)((char *)&frame_copy + (off - min)) = data; 2065 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2066 !CS_SECURE(frame_copy.tf_cs)) 2067 return (EINVAL); 2068 *(int*)((char *)p->p_addr + off) = data; 2069 return (0); 2070 } 2071 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2072 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2073 *(int*)((char *)p->p_addr + off) = data; 2074 return (0); 2075 } 2076 return (EFAULT); 2077} 2078 2079int 2080fill_regs(p, regs) 2081 struct proc *p; 2082 struct reg *regs; 2083{ 2084 struct pcb *pcb; 2085 struct trapframe *tp; 2086 2087 tp = p->p_md.md_regs; 2088 regs->r_fs = tp->tf_fs; 2089 regs->r_es = tp->tf_es; 2090 regs->r_ds = tp->tf_ds; 2091 regs->r_edi = tp->tf_edi; 2092 regs->r_esi = tp->tf_esi; 2093 regs->r_ebp = tp->tf_ebp; 2094 regs->r_ebx = tp->tf_ebx; 2095 regs->r_edx = tp->tf_edx; 2096 regs->r_ecx = tp->tf_ecx; 2097 regs->r_eax = tp->tf_eax; 2098 regs->r_eip = tp->tf_eip; 2099 regs->r_cs = tp->tf_cs; 2100 regs->r_eflags = tp->tf_eflags; 2101 regs->r_esp = tp->tf_esp; 2102 regs->r_ss = tp->tf_ss; 2103 pcb = &p->p_addr->u_pcb; 2104 regs->r_gs = pcb->pcb_gs; 2105 return (0); 2106} 2107 2108int 2109set_regs(p, regs) 2110 struct proc *p; 2111 struct reg *regs; 2112{ 2113 struct pcb *pcb; 2114 struct trapframe *tp; 2115 2116 tp = p->p_md.md_regs; 2117 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2118 !CS_SECURE(regs->r_cs)) 2119 return (EINVAL); 2120 tp->tf_fs = regs->r_fs; 2121 tp->tf_es = regs->r_es; 2122 tp->tf_ds = regs->r_ds; 2123 tp->tf_edi = regs->r_edi; 2124 tp->tf_esi = regs->r_esi; 2125 tp->tf_ebp = regs->r_ebp; 2126 tp->tf_ebx = regs->r_ebx; 2127 tp->tf_edx = regs->r_edx; 2128 tp->tf_ecx = regs->r_ecx; 2129 tp->tf_eax = regs->r_eax; 2130 tp->tf_eip = regs->r_eip; 2131 tp->tf_cs = regs->r_cs; 2132 tp->tf_eflags = regs->r_eflags; 2133 tp->tf_esp = regs->r_esp; 2134 tp->tf_ss = regs->r_ss; 2135 pcb = &p->p_addr->u_pcb; 2136 pcb->pcb_gs = regs->r_gs; 2137 return (0); 2138} 2139 2140int 2141fill_fpregs(p, fpregs) 2142 struct proc *p; 2143 struct fpreg *fpregs; 2144{ 2145 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2146 return (0); 2147} 2148 2149int 2150set_fpregs(p, fpregs) 2151 struct proc *p; 2152 struct fpreg *fpregs; 2153{ 2154 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2155 return (0); 2156} 2157 2158int 2159fill_dbregs(p, dbregs) 2160 struct proc *p; 2161 struct dbreg *dbregs; 2162{ 2163 struct pcb *pcb; 2164 2165 pcb = &p->p_addr->u_pcb; 2166 dbregs->dr0 = pcb->pcb_dr0; 2167 dbregs->dr1 = pcb->pcb_dr1; 2168 dbregs->dr2 = pcb->pcb_dr2; 2169 dbregs->dr3 = pcb->pcb_dr3; 2170 dbregs->dr4 = 0; 2171 dbregs->dr5 = 0; 2172 dbregs->dr6 = pcb->pcb_dr6; 2173 dbregs->dr7 = pcb->pcb_dr7; 2174 return (0); 2175} 2176 2177int 2178set_dbregs(p, dbregs) 2179 struct proc *p; 2180 struct dbreg *dbregs; 2181{ 2182 struct pcb *pcb; 2183 2184 pcb = &p->p_addr->u_pcb; 2185 2186 /* 2187 * Don't let a process set a breakpoint that is not within the 2188 * process's address space. If a process could do this, it 2189 * could halt the system by setting a breakpoint in the kernel 2190 * (if ddb was enabled). Thus, we need to check to make sure 2191 * that no breakpoints are being enabled for addresses outside 2192 * process's address space, unless, perhaps, we were called by 2193 * uid 0. 2194 * 2195 * XXX - what about when the watched area of the user's 2196 * address space is written into from within the kernel 2197 * ... wouldn't that still cause a breakpoint to be generated 2198 * from within kernel mode? 2199 */ 2200 2201 if (p->p_ucred->cr_uid != 0) { 2202 if (dbregs->dr7 & 0x3) { 2203 /* dr0 is enabled */ 2204 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2205 return (EINVAL); 2206 } 2207 2208 if (dbregs->dr7 & (0x3<<2)) { 2209 /* dr1 is enabled */ 2210 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2211 return (EINVAL); 2212 } 2213 2214 if (dbregs->dr7 & (0x3<<4)) { 2215 /* dr2 is enabled */ 2216 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2217 return (EINVAL); 2218 } 2219 2220 if (dbregs->dr7 & (0x3<<6)) { 2221 /* dr3 is enabled */ 2222 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2223 return (EINVAL); 2224 } 2225 } 2226 2227 pcb->pcb_dr0 = dbregs->dr0; 2228 pcb->pcb_dr1 = dbregs->dr1; 2229 pcb->pcb_dr2 = dbregs->dr2; 2230 pcb->pcb_dr3 = dbregs->dr3; 2231 pcb->pcb_dr6 = dbregs->dr6; 2232 pcb->pcb_dr7 = dbregs->dr7; 2233 2234 pcb->pcb_flags |= PCB_DBREGS; 2235 2236 return (0); 2237} 2238 2239#ifndef DDB 2240void 2241Debugger(const char *msg) 2242{ 2243 printf("Debugger(\"%s\") called.\n", msg); 2244} 2245#endif /* no DDB */ 2246 2247#include <sys/disklabel.h> 2248 2249/* 2250 * Determine the size of the transfer, and make sure it is 2251 * within the boundaries of the partition. Adjust transfer 2252 * if needed, and signal errors or early completion. 2253 */ 2254int 2255bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 2256{ 2257 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 2258 int labelsect = lp->d_partitions[0].p_offset; 2259 int maxsz = p->p_size, 2260 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2261 2262 /* overwriting disk label ? */ 2263 /* XXX should also protect bootstrap in first 8K */ 2264 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 2265#if LABELSECTOR != 0 2266 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2267#endif 2268 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2269 bp->b_error = EROFS; 2270 goto bad; 2271 } 2272 2273#if defined(DOSBBSECTOR) && defined(notyet) 2274 /* overwriting master boot record? */ 2275 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 2276 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2277 bp->b_error = EROFS; 2278 goto bad; 2279 } 2280#endif 2281 2282 /* beyond partition? */ 2283 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 2284 /* if exactly at end of disk, return an EOF */ 2285 if (bp->b_blkno == maxsz) { 2286 bp->b_resid = bp->b_bcount; 2287 return(0); 2288 } 2289 /* or truncate if part of it fits */ 2290 sz = maxsz - bp->b_blkno; 2291 if (sz <= 0) { 2292 bp->b_error = EINVAL; 2293 goto bad; 2294 } 2295 bp->b_bcount = sz << DEV_BSHIFT; 2296 } 2297 2298 bp->b_pblkno = bp->b_blkno + p->p_offset; 2299 return(1); 2300 2301bad: 2302 bp->b_flags |= B_ERROR; 2303 return(-1); 2304} 2305 2306#ifdef DDB 2307 2308/* 2309 * Provide inb() and outb() as functions. They are normally only 2310 * available as macros calling inlined functions, thus cannot be 2311 * called inside DDB. 2312 * 2313 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2314 */ 2315 2316#undef inb 2317#undef outb 2318 2319/* silence compiler warnings */ 2320u_char inb(u_int); 2321void outb(u_int, u_char); 2322 2323u_char 2324inb(u_int port) 2325{ 2326 u_char data; 2327 /* 2328 * We use %%dx and not %1 here because i/o is done at %dx and not at 2329 * %edx, while gcc generates inferior code (movw instead of movl) 2330 * if we tell it to load (u_short) port. 2331 */ 2332 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2333 return (data); 2334} 2335 2336void 2337outb(u_int port, u_char data) 2338{ 2339 u_char al; 2340 /* 2341 * Use an unnecessary assignment to help gcc's register allocator. 2342 * This make a large difference for gcc-1.40 and a tiny difference 2343 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2344 * best results. gcc-2.6.0 can't handle this. 2345 */ 2346 al = data; 2347 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2348} 2349 2350#endif /* DDB */ 2351