machdep.c revision 53503
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 53503 1999-11-21 12:38:21Z phk $ 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/proc.h> 65#include <sys/buf.h> 66#include <sys/reboot.h> 67#include <sys/callout.h> 68#include <sys/malloc.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 - oszsigcode; 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 if (((struct osigcontext *)uap->sigcntxp)->sc_trapno == 0x01d516) 877 return osigreturn(p, (struct osigreturn_args *)uap); 878 879 regs = p->p_md.md_regs; 880 ucp = uap->sigcntxp; 881 eflags = ucp->uc_mcontext.mc_eflags; 882 883 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ)) 884 return(EFAULT); 885 886 if (eflags & PSL_VM) { 887 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 888 struct vm86_kernel *vm86; 889 890 /* 891 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 892 * set up the vm86 area, and we can't enter vm86 mode. 893 */ 894 if (p->p_addr->u_pcb.pcb_ext == 0) 895 return (EINVAL); 896 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 897 if (vm86->vm86_inited == 0) 898 return (EINVAL); 899 900 /* go back to user mode if both flags are set */ 901 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 902 trapsignal(p, SIGBUS, 0); 903 904 if (vm86->vm86_has_vme) { 905 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 906 (eflags & VME_USERCHANGE) | PSL_VM; 907 } else { 908 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 909 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 910 } 911 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 912 tf->tf_eflags = eflags; 913 tf->tf_vm86_ds = tf->tf_ds; 914 tf->tf_vm86_es = tf->tf_es; 915 tf->tf_vm86_fs = tf->tf_fs; 916 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 917 tf->tf_ds = _udatasel; 918 tf->tf_es = _udatasel; 919 tf->tf_fs = _udatasel; 920 } else { 921 /* 922 * Don't allow users to change privileged or reserved flags. 923 */ 924 /* 925 * XXX do allow users to change the privileged flag PSL_RF. 926 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 927 * should sometimes set it there too. tf_eflags is kept in 928 * the signal context during signal handling and there is no 929 * other place to remember it, so the PSL_RF bit may be 930 * corrupted by the signal handler without us knowing. 931 * Corruption of the PSL_RF bit at worst causes one more or 932 * one less debugger trap, so allowing it is fairly harmless. 933 */ 934 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 935 printf("sigreturn: eflags = 0x%x\n", eflags); 936 return(EINVAL); 937 } 938 939 /* 940 * Don't allow users to load a valid privileged %cs. Let the 941 * hardware check for invalid selectors, excess privilege in 942 * other selectors, invalid %eip's and invalid %esp's. 943 */ 944 cs = ucp->uc_mcontext.mc_cs; 945 if (!CS_SECURE(cs)) { 946 printf("sigreturn: cs = 0x%x\n", cs); 947 trapsignal(p, SIGBUS, T_PROTFLT); 948 return(EINVAL); 949 } 950 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe)); 951 } 952 953 if (ucp->uc_mcontext.mc_onstack & 1) 954 p->p_sigstk.ss_flags |= SS_ONSTACK; 955 else 956 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 957 958 p->p_sigmask = ucp->uc_sigmask; 959 SIG_CANTMASK(p->p_sigmask); 960 return(EJUSTRETURN); 961} 962 963/* 964 * Machine dependent boot() routine 965 * 966 * I haven't seen anything to put here yet 967 * Possibly some stuff might be grafted back here from boot() 968 */ 969void 970cpu_boot(int howto) 971{ 972} 973 974/* 975 * Shutdown the CPU as much as possible 976 */ 977void 978cpu_halt(void) 979{ 980 for (;;) 981 __asm__ ("hlt"); 982} 983 984/* 985 * Clear registers on exec 986 */ 987void 988setregs(p, entry, stack, ps_strings) 989 struct proc *p; 990 u_long entry; 991 u_long stack; 992 u_long ps_strings; 993{ 994 struct trapframe *regs = p->p_md.md_regs; 995 struct pcb *pcb = &p->p_addr->u_pcb; 996 997#ifdef USER_LDT 998 /* was i386_user_cleanup() in NetBSD */ 999 if (pcb->pcb_ldt) { 1000 if (pcb == curpcb) { 1001 lldt(_default_ldt); 1002 currentldt = _default_ldt; 1003 } 1004 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 1005 pcb->pcb_ldt_len * sizeof(union descriptor)); 1006 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 1007 } 1008#endif 1009 1010 bzero((char *)regs, sizeof(struct trapframe)); 1011 regs->tf_eip = entry; 1012 regs->tf_esp = stack; 1013 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 1014 regs->tf_ss = _udatasel; 1015 regs->tf_ds = _udatasel; 1016 regs->tf_es = _udatasel; 1017 regs->tf_fs = _udatasel; 1018 regs->tf_cs = _ucodesel; 1019 1020 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1021 regs->tf_ebx = ps_strings; 1022 1023 /* reset %gs as well */ 1024 if (pcb == curpcb) 1025 load_gs(_udatasel); 1026 else 1027 pcb->pcb_gs = _udatasel; 1028 1029 /* 1030 * Initialize the math emulator (if any) for the current process. 1031 * Actually, just clear the bit that says that the emulator has 1032 * been initialized. Initialization is delayed until the process 1033 * traps to the emulator (if it is done at all) mainly because 1034 * emulators don't provide an entry point for initialization. 1035 */ 1036 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 1037 1038 /* 1039 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1040 * for why fwait must be trapped at least if there is an npx or an 1041 * emulator). This is mainly to handle the case where npx0 is not 1042 * configured, since the npx routines normally set up the trap 1043 * otherwise. It should be done only at boot time, but doing it 1044 * here allows modifying `npx_exists' for testing the emulator on 1045 * systems with an npx. 1046 */ 1047 load_cr0(rcr0() | CR0_MP | CR0_TS); 1048 1049#if NNPX > 0 1050 /* Initialize the npx (if any) for the current process. */ 1051 npxinit(__INITIAL_NPXCW__); 1052#endif 1053 1054 /* 1055 * XXX - Linux emulator 1056 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1057 * on it. 1058 */ 1059 p->p_retval[1] = 0; 1060} 1061 1062static int 1063sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1064{ 1065 int error; 1066 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1067 req); 1068 if (!error && req->newptr) 1069 resettodr(); 1070 return (error); 1071} 1072 1073SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1074 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1075 1076SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1077 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1078 1079SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1080 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1081 1082SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1083 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1084 1085/* 1086 * Initialize 386 and configure to run kernel 1087 */ 1088 1089/* 1090 * Initialize segments & interrupt table 1091 */ 1092 1093int _default_ldt; 1094#ifdef SMP 1095union descriptor gdt[NGDT * NCPU]; /* global descriptor table */ 1096#else 1097union descriptor gdt[NGDT]; /* global descriptor table */ 1098#endif 1099static struct gate_descriptor idt0[NIDT]; 1100struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1101union descriptor ldt[NLDT]; /* local descriptor table */ 1102#ifdef SMP 1103/* table descriptors - used to load tables by microp */ 1104struct region_descriptor r_gdt, r_idt; 1105#endif 1106 1107#ifndef SMP 1108extern struct segment_descriptor common_tssd, *tss_gdt; 1109#endif 1110int private_tss; /* flag indicating private tss */ 1111 1112#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1113extern int has_f00f_bug; 1114#endif 1115 1116static struct i386tss dblfault_tss; 1117static char dblfault_stack[PAGE_SIZE]; 1118 1119extern struct user *proc0paddr; 1120 1121 1122/* software prototypes -- in more palatable form */ 1123struct soft_segment_descriptor gdt_segs[] = { 1124/* GNULL_SEL 0 Null Descriptor */ 1125{ 0x0, /* segment base address */ 1126 0x0, /* length */ 1127 0, /* segment type */ 1128 0, /* segment descriptor priority level */ 1129 0, /* segment descriptor present */ 1130 0, 0, 1131 0, /* default 32 vs 16 bit size */ 1132 0 /* limit granularity (byte/page units)*/ }, 1133/* GCODE_SEL 1 Code Descriptor for kernel */ 1134{ 0x0, /* segment base address */ 1135 0xfffff, /* length - all address space */ 1136 SDT_MEMERA, /* segment type */ 1137 0, /* segment descriptor priority level */ 1138 1, /* segment descriptor present */ 1139 0, 0, 1140 1, /* default 32 vs 16 bit size */ 1141 1 /* limit granularity (byte/page units)*/ }, 1142/* GDATA_SEL 2 Data Descriptor for kernel */ 1143{ 0x0, /* segment base address */ 1144 0xfffff, /* length - all address space */ 1145 SDT_MEMRWA, /* 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/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 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/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1161{ 1162 0x0, /* segment base address */ 1163 sizeof(struct i386tss)-1,/* length - all address space */ 1164 SDT_SYS386TSS, /* segment type */ 1165 0, /* segment descriptor priority level */ 1166 1, /* segment descriptor present */ 1167 0, 0, 1168 0, /* unused - default 32 vs 16 bit size */ 1169 0 /* limit granularity (byte/page units)*/ }, 1170/* GLDT_SEL 5 LDT Descriptor */ 1171{ (int) ldt, /* segment base address */ 1172 sizeof(ldt)-1, /* length - all address space */ 1173 SDT_SYSLDT, /* segment type */ 1174 SEL_UPL, /* 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/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1180{ (int) ldt, /* segment base address */ 1181 (512 * sizeof(union descriptor)-1), /* length */ 1182 SDT_SYSLDT, /* segment type */ 1183 0, /* 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/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1189{ 0x0, /* segment base address */ 1190 0x0, /* length - all address space */ 1191 0, /* segment type */ 1192 0, /* segment descriptor priority level */ 1193 0, /* segment descriptor present */ 1194 0, 0, 1195 0, /* default 32 vs 16 bit size */ 1196 0 /* limit granularity (byte/page units)*/ }, 1197/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1198{ 0x400, /* segment base address */ 1199 0xfffff, /* length */ 1200 SDT_MEMRWA, /* segment type */ 1201 0, /* segment descriptor priority level */ 1202 1, /* segment descriptor present */ 1203 0, 0, 1204 1, /* default 32 vs 16 bit size */ 1205 1 /* limit granularity (byte/page units)*/ }, 1206/* GPANIC_SEL 9 Panic Tss Descriptor */ 1207{ (int) &dblfault_tss, /* segment base address */ 1208 sizeof(struct i386tss)-1,/* length - all address space */ 1209 SDT_SYS386TSS, /* segment type */ 1210 0, /* segment descriptor priority level */ 1211 1, /* segment descriptor present */ 1212 0, 0, 1213 0, /* unused - default 32 vs 16 bit size */ 1214 0 /* limit granularity (byte/page units)*/ }, 1215/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1216{ 0, /* segment base address (overwritten) */ 1217 0xfffff, /* length */ 1218 SDT_MEMERA, /* segment type */ 1219 0, /* segment descriptor priority level */ 1220 1, /* segment descriptor present */ 1221 0, 0, 1222 0, /* default 32 vs 16 bit size */ 1223 1 /* limit granularity (byte/page units)*/ }, 1224/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit 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/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1234{ 0, /* segment base address (overwritten) */ 1235 0xfffff, /* length */ 1236 SDT_MEMRWA, /* segment type */ 1237 0, /* segment descriptor priority level */ 1238 1, /* segment descriptor present */ 1239 0, 0, 1240 1, /* default 32 vs 16 bit size */ 1241 1 /* limit granularity (byte/page units)*/ }, 1242/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 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 0, /* default 32 vs 16 bit size */ 1250 1 /* limit granularity (byte/page units)*/ }, 1251/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 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}; 1261 1262static struct soft_segment_descriptor ldt_segs[] = { 1263 /* Null Descriptor - overwritten by call gate */ 1264{ 0x0, /* segment base address */ 1265 0x0, /* length - all address space */ 1266 0, /* segment type */ 1267 0, /* segment descriptor priority level */ 1268 0, /* segment descriptor present */ 1269 0, 0, 1270 0, /* default 32 vs 16 bit size */ 1271 0 /* limit granularity (byte/page units)*/ }, 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 /* Code Descriptor for user */ 1291{ 0x0, /* segment base address */ 1292 0xfffff, /* length - all address space */ 1293 SDT_MEMERA, /* segment type */ 1294 SEL_UPL, /* segment descriptor priority level */ 1295 1, /* segment descriptor present */ 1296 0, 0, 1297 1, /* default 32 vs 16 bit size */ 1298 1 /* limit granularity (byte/page units)*/ }, 1299 /* Null Descriptor - overwritten by call gate */ 1300{ 0x0, /* segment base address */ 1301 0x0, /* length - all address space */ 1302 0, /* segment type */ 1303 0, /* segment descriptor priority level */ 1304 0, /* segment descriptor present */ 1305 0, 0, 1306 0, /* default 32 vs 16 bit size */ 1307 0 /* limit granularity (byte/page units)*/ }, 1308 /* Data Descriptor for user */ 1309{ 0x0, /* segment base address */ 1310 0xfffff, /* length - all address space */ 1311 SDT_MEMRWA, /* segment type */ 1312 SEL_UPL, /* segment descriptor priority level */ 1313 1, /* segment descriptor present */ 1314 0, 0, 1315 1, /* default 32 vs 16 bit size */ 1316 1 /* limit granularity (byte/page units)*/ }, 1317}; 1318 1319void 1320setidt(idx, func, typ, dpl, selec) 1321 int idx; 1322 inthand_t *func; 1323 int typ; 1324 int dpl; 1325 int selec; 1326{ 1327 struct gate_descriptor *ip; 1328 1329 ip = idt + idx; 1330 ip->gd_looffset = (int)func; 1331 ip->gd_selector = selec; 1332 ip->gd_stkcpy = 0; 1333 ip->gd_xx = 0; 1334 ip->gd_type = typ; 1335 ip->gd_dpl = dpl; 1336 ip->gd_p = 1; 1337 ip->gd_hioffset = ((int)func)>>16 ; 1338} 1339 1340#define IDTVEC(name) __CONCAT(X,name) 1341 1342extern inthand_t 1343 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1344 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1345 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1346 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1347 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1348 1349void 1350sdtossd(sd, ssd) 1351 struct segment_descriptor *sd; 1352 struct soft_segment_descriptor *ssd; 1353{ 1354 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1355 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1356 ssd->ssd_type = sd->sd_type; 1357 ssd->ssd_dpl = sd->sd_dpl; 1358 ssd->ssd_p = sd->sd_p; 1359 ssd->ssd_def32 = sd->sd_def32; 1360 ssd->ssd_gran = sd->sd_gran; 1361} 1362 1363#define PHYSMAP_SIZE (2 * 8) 1364 1365/* 1366 * Populate the (physmap) array with base/bound pairs describing the 1367 * available physical memory in the system, then test this memory and 1368 * build the phys_avail array describing the actually-available memory. 1369 * 1370 * If we cannot accurately determine the physical memory map, then use 1371 * value from the 0xE801 call, and failing that, the RTC. 1372 * 1373 * Total memory size may be set by the kernel environment variable 1374 * hw.physmem or the compile-time define MAXMEM. 1375 */ 1376static void 1377getmemsize(int first) 1378{ 1379 int i, physmap_idx, pa_indx; 1380 u_int basemem, extmem; 1381 struct vm86frame vmf; 1382 struct vm86context vmc; 1383 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1384 pt_entry_t pte; 1385 const char *cp; 1386 struct { 1387 u_int64_t base; 1388 u_int64_t length; 1389 u_int32_t type; 1390 } *smap; 1391 1392 bzero(&vmf, sizeof(struct vm86frame)); 1393 bzero(physmap, sizeof(physmap)); 1394 1395 /* 1396 * Perform "base memory" related probes & setup 1397 */ 1398 vm86_intcall(0x12, &vmf); 1399 basemem = vmf.vmf_ax; 1400 if (basemem > 640) { 1401 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1402 basemem); 1403 basemem = 640; 1404 } 1405 1406 /* 1407 * XXX if biosbasemem is now < 640, there is a `hole' 1408 * between the end of base memory and the start of 1409 * ISA memory. The hole may be empty or it may 1410 * contain BIOS code or data. Map it read/write so 1411 * that the BIOS can write to it. (Memory from 0 to 1412 * the physical end of the kernel is mapped read-only 1413 * to begin with and then parts of it are remapped. 1414 * The parts that aren't remapped form holes that 1415 * remain read-only and are unused by the kernel. 1416 * The base memory area is below the physical end of 1417 * the kernel and right now forms a read-only hole. 1418 * The part of it from PAGE_SIZE to 1419 * (trunc_page(biosbasemem * 1024) - 1) will be 1420 * remapped and used by the kernel later.) 1421 * 1422 * This code is similar to the code used in 1423 * pmap_mapdev, but since no memory needs to be 1424 * allocated we simply change the mapping. 1425 */ 1426 for (pa = trunc_page(basemem * 1024); 1427 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1428 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1429 *pte = pa | PG_RW | PG_V; 1430 } 1431 1432 /* 1433 * if basemem != 640, map pages r/w into vm86 page table so 1434 * that the bios can scribble on it. 1435 */ 1436 pte = (pt_entry_t)vm86paddr; 1437 for (i = basemem / 4; i < 160; i++) 1438 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1439 1440 /* 1441 * map page 1 R/W into the kernel page table so we can use it 1442 * as a buffer. The kernel will unmap this page later. 1443 */ 1444 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1445 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1446 1447 /* 1448 * get memory map with INT 15:E820 1449 */ 1450#define SMAPSIZ sizeof(*smap) 1451#define SMAP_SIG 0x534D4150 /* 'SMAP' */ 1452 1453 vmc.npages = 0; 1454 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1455 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1456 1457 physmap_idx = 0; 1458 vmf.vmf_ebx = 0; 1459 do { 1460 vmf.vmf_eax = 0xE820; 1461 vmf.vmf_edx = SMAP_SIG; 1462 vmf.vmf_ecx = SMAPSIZ; 1463 i = vm86_datacall(0x15, &vmf, &vmc); 1464 if (i || vmf.vmf_eax != SMAP_SIG) 1465 break; 1466 if (boothowto & RB_VERBOSE) 1467 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1468 smap->type, 1469 *(u_int32_t *)((char *)&smap->base + 4), 1470 (u_int32_t)smap->base, 1471 *(u_int32_t *)((char *)&smap->length + 4), 1472 (u_int32_t)smap->length); 1473 1474 if (smap->type != 0x01) 1475 goto next_run; 1476 1477 if (smap->length == 0) 1478 goto next_run; 1479 1480 if (smap->base >= 0xffffffff) { 1481 printf("%uK of memory above 4GB ignored\n", 1482 (u_int)(smap->length / 1024)); 1483 goto next_run; 1484 } 1485 1486 for (i = 0; i <= physmap_idx; i += 2) { 1487 if (smap->base < physmap[i + 1]) { 1488 if (boothowto & RB_VERBOSE) 1489 printf( 1490 "Overlapping or non-montonic memory region, ignoring second region\n"); 1491 goto next_run; 1492 } 1493 } 1494 1495 if (smap->base == physmap[physmap_idx + 1]) { 1496 physmap[physmap_idx + 1] += smap->length; 1497 goto next_run; 1498 } 1499 1500 physmap_idx += 2; 1501 if (physmap_idx == PHYSMAP_SIZE) { 1502 printf( 1503 "Too many segments in the physical address map, giving up\n"); 1504 break; 1505 } 1506 physmap[physmap_idx] = smap->base; 1507 physmap[physmap_idx + 1] = smap->base + smap->length; 1508next_run: 1509 } while (vmf.vmf_ebx != 0); 1510 1511 if (physmap[1] != 0) 1512 goto physmap_done; 1513 1514 /* 1515 * If we failed above, try memory map with INT 15:E801 1516 */ 1517 vmf.vmf_ax = 0xE801; 1518 if (vm86_intcall(0x15, &vmf) == 0) { 1519 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1520 } else { 1521#if 0 1522 vmf.vmf_ah = 0x88; 1523 vm86_intcall(0x15, &vmf); 1524 extmem = vmf.vmf_ax; 1525#else 1526 /* 1527 * Prefer the RTC value for extended memory. 1528 */ 1529 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1530#endif 1531 } 1532 1533 /* 1534 * Special hack for chipsets that still remap the 384k hole when 1535 * there's 16MB of memory - this really confuses people that 1536 * are trying to use bus mastering ISA controllers with the 1537 * "16MB limit"; they only have 16MB, but the remapping puts 1538 * them beyond the limit. 1539 * 1540 * If extended memory is between 15-16MB (16-17MB phys address range), 1541 * chop it to 15MB. 1542 */ 1543 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1544 extmem = 15 * 1024; 1545 1546 physmap[0] = 0; 1547 physmap[1] = basemem * 1024; 1548 physmap_idx = 2; 1549 physmap[physmap_idx] = 0x100000; 1550 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1551 1552physmap_done: 1553 /* 1554 * Now, physmap contains a map of physical memory. 1555 */ 1556 1557#ifdef SMP 1558 /* make hole for AP bootstrap code */ 1559 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1560 1561 /* look for the MP hardware - needed for apic addresses */ 1562 mp_probe(); 1563#endif 1564 1565 /* 1566 * Maxmem isn't the "maximum memory", it's one larger than the 1567 * highest page of the physical address space. It should be 1568 * called something like "Maxphyspage". We may adjust this 1569 * based on ``hw.physmem'' and the results of the memory test. 1570 */ 1571 Maxmem = atop(physmap[physmap_idx + 1]); 1572 1573#ifdef MAXMEM 1574 Maxmem = MAXMEM / 4; 1575#endif 1576 1577 /* 1578 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes 1579 * for the appropriate modifiers. This overrides MAXMEM. 1580 */ 1581 if ((cp = getenv("hw.physmem")) != NULL) { 1582 u_int64_t AllowMem, sanity; 1583 const char *ep; 1584 1585 sanity = AllowMem = strtouq(cp, &ep, 0); 1586 if ((ep != cp) && (*ep != 0)) { 1587 switch(*ep) { 1588 case 'g': 1589 case 'G': 1590 AllowMem <<= 10; 1591 case 'm': 1592 case 'M': 1593 AllowMem <<= 10; 1594 case 'k': 1595 case 'K': 1596 AllowMem <<= 10; 1597 break; 1598 default: 1599 AllowMem = sanity = 0; 1600 } 1601 if (AllowMem < sanity) 1602 AllowMem = 0; 1603 } 1604 if (AllowMem == 0) 1605 printf("Ignoring invalid memory size of '%s'\n", cp); 1606 else 1607 Maxmem = atop(AllowMem); 1608 } 1609 1610 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1611 (boothowto & RB_VERBOSE)) 1612 printf("Physical memory use set to %uK\n", Maxmem * 4); 1613 1614 /* 1615 * If Maxmem has been increased beyond what the system has detected, 1616 * extend the last memory segment to the new limit. 1617 */ 1618 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1619 physmap[physmap_idx + 1] = ptoa(Maxmem); 1620 1621 /* call pmap initialization to make new kernel address space */ 1622 pmap_bootstrap(first, 0); 1623 1624 /* 1625 * Size up each available chunk of physical memory. 1626 */ 1627 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1628 pa_indx = 0; 1629 phys_avail[pa_indx++] = physmap[0]; 1630 phys_avail[pa_indx] = physmap[0]; 1631#if 0 1632 pte = (pt_entry_t)vtopte(KERNBASE); 1633#else 1634 pte = (pt_entry_t)CMAP1; 1635#endif 1636 1637 /* 1638 * physmap is in bytes, so when converting to page boundaries, 1639 * round up the start address and round down the end address. 1640 */ 1641 for (i = 0; i <= physmap_idx; i += 2) { 1642 vm_offset_t end; 1643 1644 end = ptoa(Maxmem); 1645 if (physmap[i + 1] < end) 1646 end = trunc_page(physmap[i + 1]); 1647 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1648 int tmp, page_bad; 1649#if 0 1650 int *ptr = 0; 1651#else 1652 int *ptr = (int *)CADDR1; 1653#endif 1654 1655 /* 1656 * block out kernel memory as not available. 1657 */ 1658 if (pa >= 0x100000 && pa < first) 1659 continue; 1660 1661 page_bad = FALSE; 1662 1663 /* 1664 * map page into kernel: valid, read/write,non-cacheable 1665 */ 1666 *pte = pa | PG_V | PG_RW | PG_N; 1667 invltlb(); 1668 1669 tmp = *(int *)ptr; 1670 /* 1671 * Test for alternating 1's and 0's 1672 */ 1673 *(volatile int *)ptr = 0xaaaaaaaa; 1674 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1675 page_bad = TRUE; 1676 } 1677 /* 1678 * Test for alternating 0's and 1's 1679 */ 1680 *(volatile int *)ptr = 0x55555555; 1681 if (*(volatile int *)ptr != 0x55555555) { 1682 page_bad = TRUE; 1683 } 1684 /* 1685 * Test for all 1's 1686 */ 1687 *(volatile int *)ptr = 0xffffffff; 1688 if (*(volatile int *)ptr != 0xffffffff) { 1689 page_bad = TRUE; 1690 } 1691 /* 1692 * Test for all 0's 1693 */ 1694 *(volatile int *)ptr = 0x0; 1695 if (*(volatile int *)ptr != 0x0) { 1696 page_bad = TRUE; 1697 } 1698 /* 1699 * Restore original value. 1700 */ 1701 *(int *)ptr = tmp; 1702 1703 /* 1704 * Adjust array of valid/good pages. 1705 */ 1706 if (page_bad == TRUE) { 1707 continue; 1708 } 1709 /* 1710 * If this good page is a continuation of the 1711 * previous set of good pages, then just increase 1712 * the end pointer. Otherwise start a new chunk. 1713 * Note that "end" points one higher than end, 1714 * making the range >= start and < end. 1715 * If we're also doing a speculative memory 1716 * test and we at or past the end, bump up Maxmem 1717 * so that we keep going. The first bad page 1718 * will terminate the loop. 1719 */ 1720 if (phys_avail[pa_indx] == pa) { 1721 phys_avail[pa_indx] += PAGE_SIZE; 1722 } else { 1723 pa_indx++; 1724 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1725 printf("Too many holes in the physical address space, giving up\n"); 1726 pa_indx--; 1727 break; 1728 } 1729 phys_avail[pa_indx++] = pa; /* start */ 1730 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1731 } 1732 physmem++; 1733 } 1734 } 1735 *pte = 0; 1736 invltlb(); 1737 1738 /* 1739 * XXX 1740 * The last chunk must contain at least one page plus the message 1741 * buffer to avoid complicating other code (message buffer address 1742 * calculation, etc.). 1743 */ 1744 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1745 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1746 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1747 phys_avail[pa_indx--] = 0; 1748 phys_avail[pa_indx--] = 0; 1749 } 1750 1751 Maxmem = atop(phys_avail[pa_indx]); 1752 1753 /* Trim off space for the message buffer. */ 1754 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1755 1756 avail_end = phys_avail[pa_indx]; 1757} 1758 1759void 1760init386(first) 1761 int first; 1762{ 1763 int x; 1764 struct gate_descriptor *gdp; 1765 int gsel_tss; 1766#ifndef SMP 1767 /* table descriptors - used to load tables by microp */ 1768 struct region_descriptor r_gdt, r_idt; 1769#endif 1770 int off; 1771 1772 /* 1773 * Prevent lowering of the ipl if we call tsleep() early. 1774 */ 1775 safepri = cpl; 1776 1777 proc0.p_addr = proc0paddr; 1778 1779 atdevbase = ISA_HOLE_START + KERNBASE; 1780 1781 if (bootinfo.bi_modulep) { 1782 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1783 preload_bootstrap_relocate(KERNBASE); 1784 } 1785 if (bootinfo.bi_envp) 1786 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1787 1788 /* 1789 * make gdt memory segments, the code segment goes up to end of the 1790 * page with etext in it, the data segment goes to the end of 1791 * the address space 1792 */ 1793 /* 1794 * XXX text protection is temporarily (?) disabled. The limit was 1795 * i386_btop(round_page(etext)) - 1. 1796 */ 1797 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1798 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1799#ifdef SMP 1800 gdt_segs[GPRIV_SEL].ssd_limit = 1801 i386_btop(sizeof(struct privatespace)) - 1; 1802 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1803 gdt_segs[GPROC0_SEL].ssd_base = 1804 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1805 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0]; 1806#else 1807 gdt_segs[GPRIV_SEL].ssd_limit = i386_btop(0) - 1; 1808 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss; 1809#endif 1810 1811 for (x = 0; x < NGDT; x++) { 1812#ifdef BDE_DEBUGGER 1813 /* avoid overwriting db entries with APM ones */ 1814 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1815 continue; 1816#endif 1817 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1818 } 1819 1820 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1821 r_gdt.rd_base = (int) gdt; 1822 lgdt(&r_gdt); 1823 1824 /* make ldt memory segments */ 1825 /* 1826 * The data segment limit must not cover the user area because we 1827 * don't want the user area to be writable in copyout() etc. (page 1828 * level protection is lost in kernel mode on 386's). Also, we 1829 * don't want the user area to be writable directly (page level 1830 * protection of the user area is not available on 486's with 1831 * CR0_WP set, because there is no user-read/kernel-write mode). 1832 * 1833 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1834 * should be spelled ...MAX_USER... 1835 */ 1836#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1837 /* 1838 * The code segment limit has to cover the user area until we move 1839 * the signal trampoline out of the user area. This is safe because 1840 * the code segment cannot be written to directly. 1841 */ 1842#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1843 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1844 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1845 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1846 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1847 1848 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1849 lldt(_default_ldt); 1850#ifdef USER_LDT 1851 currentldt = _default_ldt; 1852#endif 1853 1854 /* exceptions */ 1855 for (x = 0; x < NIDT; x++) 1856 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1857 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1858 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1859 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1860 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1861 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1862 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1863 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1864 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1865 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1866 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1867 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1868 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1869 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1870 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1871 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1872 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1873 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1874 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1875 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1876 setidt(0x80, &IDTVEC(int0x80_syscall), 1877 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1878 1879 r_idt.rd_limit = sizeof(idt0) - 1; 1880 r_idt.rd_base = (int) idt; 1881 lidt(&r_idt); 1882 1883 /* 1884 * Initialize the console before we print anything out. 1885 */ 1886 cninit(); 1887 1888#include "isa.h" 1889#if NISA >0 1890 isa_defaultirq(); 1891#endif 1892 rand_initialize(); 1893 1894#ifdef DDB 1895 kdb_init(); 1896 if (boothowto & RB_KDB) 1897 Debugger("Boot flags requested debugger"); 1898#endif 1899 1900 finishidentcpu(); /* Final stage of CPU initialization */ 1901 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1902 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1903 initializecpu(); /* Initialize CPU registers */ 1904 1905 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1906 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1907 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1908 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1909 private_tss = 0; 1910 tss_gdt = &gdt[GPROC0_SEL].sd; 1911 common_tssd = *tss_gdt; 1912 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1913 ltr(gsel_tss); 1914 1915 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1916 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1917 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1918 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1919 dblfault_tss.tss_cr3 = (int)IdlePTD; 1920 dblfault_tss.tss_eip = (int) dblfault_handler; 1921 dblfault_tss.tss_eflags = PSL_KERNEL; 1922 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1923 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1924 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1925 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1926 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1927 1928 vm86_initialize(); 1929 getmemsize(first); 1930 1931 /* now running on new page tables, configured,and u/iom is accessible */ 1932 1933 /* Map the message buffer. */ 1934 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1935 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1936 1937 msgbufinit(msgbufp, MSGBUF_SIZE); 1938 1939 /* make a call gate to reenter kernel with */ 1940 gdp = &ldt[LSYS5CALLS_SEL].gd; 1941 1942 x = (int) &IDTVEC(syscall); 1943 gdp->gd_looffset = x++; 1944 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1945 gdp->gd_stkcpy = 1; 1946 gdp->gd_type = SDT_SYS386CGT; 1947 gdp->gd_dpl = SEL_UPL; 1948 gdp->gd_p = 1; 1949 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1950 1951 /* XXX does this work? */ 1952 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1953 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1954 1955 /* transfer to user mode */ 1956 1957 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1958 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1959 1960 /* setup proc 0's pcb */ 1961 proc0.p_addr->u_pcb.pcb_flags = 0; 1962 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1963#ifdef SMP 1964 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1965#endif 1966 proc0.p_addr->u_pcb.pcb_ext = 0; 1967} 1968 1969#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1970static void f00f_hack(void *unused); 1971SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1972 1973static void 1974f00f_hack(void *unused) { 1975 struct gate_descriptor *new_idt; 1976#ifndef SMP 1977 struct region_descriptor r_idt; 1978#endif 1979 vm_offset_t tmp; 1980 1981 if (!has_f00f_bug) 1982 return; 1983 1984 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1985 1986 r_idt.rd_limit = sizeof(idt0) - 1; 1987 1988 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1989 if (tmp == 0) 1990 panic("kmem_alloc returned 0"); 1991 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1992 panic("kmem_alloc returned non-page-aligned memory"); 1993 /* Put the first seven entries in the lower page */ 1994 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1995 bcopy(idt, new_idt, sizeof(idt0)); 1996 r_idt.rd_base = (int)new_idt; 1997 lidt(&r_idt); 1998 idt = new_idt; 1999 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2000 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2001 panic("vm_map_protect failed"); 2002 return; 2003} 2004#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2005 2006int 2007ptrace_set_pc(p, addr) 2008 struct proc *p; 2009 unsigned long addr; 2010{ 2011 p->p_md.md_regs->tf_eip = addr; 2012 return (0); 2013} 2014 2015int 2016ptrace_single_step(p) 2017 struct proc *p; 2018{ 2019 p->p_md.md_regs->tf_eflags |= PSL_T; 2020 return (0); 2021} 2022 2023int ptrace_read_u_check(p, addr, len) 2024 struct proc *p; 2025 vm_offset_t addr; 2026 size_t len; 2027{ 2028 vm_offset_t gap; 2029 2030 if ((vm_offset_t) (addr + len) < addr) 2031 return EPERM; 2032 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 2033 return 0; 2034 2035 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 2036 2037 if ((vm_offset_t) addr < gap) 2038 return EPERM; 2039 if ((vm_offset_t) (addr + len) <= 2040 (vm_offset_t) (gap + sizeof(struct trapframe))) 2041 return 0; 2042 return EPERM; 2043} 2044 2045int ptrace_write_u(p, off, data) 2046 struct proc *p; 2047 vm_offset_t off; 2048 long data; 2049{ 2050 struct trapframe frame_copy; 2051 vm_offset_t min; 2052 struct trapframe *tp; 2053 2054 /* 2055 * Privileged kernel state is scattered all over the user area. 2056 * Only allow write access to parts of regs and to fpregs. 2057 */ 2058 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 2059 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 2060 tp = p->p_md.md_regs; 2061 frame_copy = *tp; 2062 *(int *)((char *)&frame_copy + (off - min)) = data; 2063 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 2064 !CS_SECURE(frame_copy.tf_cs)) 2065 return (EINVAL); 2066 *(int*)((char *)p->p_addr + off) = data; 2067 return (0); 2068 } 2069 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 2070 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 2071 *(int*)((char *)p->p_addr + off) = data; 2072 return (0); 2073 } 2074 return (EFAULT); 2075} 2076 2077int 2078fill_regs(p, regs) 2079 struct proc *p; 2080 struct reg *regs; 2081{ 2082 struct pcb *pcb; 2083 struct trapframe *tp; 2084 2085 tp = p->p_md.md_regs; 2086 regs->r_fs = tp->tf_fs; 2087 regs->r_es = tp->tf_es; 2088 regs->r_ds = tp->tf_ds; 2089 regs->r_edi = tp->tf_edi; 2090 regs->r_esi = tp->tf_esi; 2091 regs->r_ebp = tp->tf_ebp; 2092 regs->r_ebx = tp->tf_ebx; 2093 regs->r_edx = tp->tf_edx; 2094 regs->r_ecx = tp->tf_ecx; 2095 regs->r_eax = tp->tf_eax; 2096 regs->r_eip = tp->tf_eip; 2097 regs->r_cs = tp->tf_cs; 2098 regs->r_eflags = tp->tf_eflags; 2099 regs->r_esp = tp->tf_esp; 2100 regs->r_ss = tp->tf_ss; 2101 pcb = &p->p_addr->u_pcb; 2102 regs->r_gs = pcb->pcb_gs; 2103 return (0); 2104} 2105 2106int 2107set_regs(p, regs) 2108 struct proc *p; 2109 struct reg *regs; 2110{ 2111 struct pcb *pcb; 2112 struct trapframe *tp; 2113 2114 tp = p->p_md.md_regs; 2115 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2116 !CS_SECURE(regs->r_cs)) 2117 return (EINVAL); 2118 tp->tf_fs = regs->r_fs; 2119 tp->tf_es = regs->r_es; 2120 tp->tf_ds = regs->r_ds; 2121 tp->tf_edi = regs->r_edi; 2122 tp->tf_esi = regs->r_esi; 2123 tp->tf_ebp = regs->r_ebp; 2124 tp->tf_ebx = regs->r_ebx; 2125 tp->tf_edx = regs->r_edx; 2126 tp->tf_ecx = regs->r_ecx; 2127 tp->tf_eax = regs->r_eax; 2128 tp->tf_eip = regs->r_eip; 2129 tp->tf_cs = regs->r_cs; 2130 tp->tf_eflags = regs->r_eflags; 2131 tp->tf_esp = regs->r_esp; 2132 tp->tf_ss = regs->r_ss; 2133 pcb = &p->p_addr->u_pcb; 2134 pcb->pcb_gs = regs->r_gs; 2135 return (0); 2136} 2137 2138int 2139fill_fpregs(p, fpregs) 2140 struct proc *p; 2141 struct fpreg *fpregs; 2142{ 2143 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 2144 return (0); 2145} 2146 2147int 2148set_fpregs(p, fpregs) 2149 struct proc *p; 2150 struct fpreg *fpregs; 2151{ 2152 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 2153 return (0); 2154} 2155 2156int 2157fill_dbregs(p, dbregs) 2158 struct proc *p; 2159 struct dbreg *dbregs; 2160{ 2161 struct pcb *pcb; 2162 2163 pcb = &p->p_addr->u_pcb; 2164 dbregs->dr0 = pcb->pcb_dr0; 2165 dbregs->dr1 = pcb->pcb_dr1; 2166 dbregs->dr2 = pcb->pcb_dr2; 2167 dbregs->dr3 = pcb->pcb_dr3; 2168 dbregs->dr4 = 0; 2169 dbregs->dr5 = 0; 2170 dbregs->dr6 = pcb->pcb_dr6; 2171 dbregs->dr7 = pcb->pcb_dr7; 2172 return (0); 2173} 2174 2175int 2176set_dbregs(p, dbregs) 2177 struct proc *p; 2178 struct dbreg *dbregs; 2179{ 2180 struct pcb *pcb; 2181 2182 pcb = &p->p_addr->u_pcb; 2183 2184 /* 2185 * Don't let a process set a breakpoint that is not within the 2186 * process's address space. If a process could do this, it 2187 * could halt the system by setting a breakpoint in the kernel 2188 * (if ddb was enabled). Thus, we need to check to make sure 2189 * that no breakpoints are being enabled for addresses outside 2190 * process's address space, unless, perhaps, we were called by 2191 * uid 0. 2192 * 2193 * XXX - what about when the watched area of the user's 2194 * address space is written into from within the kernel 2195 * ... wouldn't that still cause a breakpoint to be generated 2196 * from within kernel mode? 2197 */ 2198 2199 if (p->p_ucred->cr_uid != 0) { 2200 if (dbregs->dr7 & 0x3) { 2201 /* dr0 is enabled */ 2202 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2203 return (EINVAL); 2204 } 2205 2206 if (dbregs->dr7 & (0x3<<2)) { 2207 /* dr1 is enabled */ 2208 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2209 return (EINVAL); 2210 } 2211 2212 if (dbregs->dr7 & (0x3<<4)) { 2213 /* dr2 is enabled */ 2214 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2215 return (EINVAL); 2216 } 2217 2218 if (dbregs->dr7 & (0x3<<6)) { 2219 /* dr3 is enabled */ 2220 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2221 return (EINVAL); 2222 } 2223 } 2224 2225 pcb->pcb_dr0 = dbregs->dr0; 2226 pcb->pcb_dr1 = dbregs->dr1; 2227 pcb->pcb_dr2 = dbregs->dr2; 2228 pcb->pcb_dr3 = dbregs->dr3; 2229 pcb->pcb_dr6 = dbregs->dr6; 2230 pcb->pcb_dr7 = dbregs->dr7; 2231 2232 pcb->pcb_flags |= PCB_DBREGS; 2233 2234 return (0); 2235} 2236 2237#ifndef DDB 2238void 2239Debugger(const char *msg) 2240{ 2241 printf("Debugger(\"%s\") called.\n", msg); 2242} 2243#endif /* no DDB */ 2244 2245#include <sys/disklabel.h> 2246 2247/* 2248 * Determine the size of the transfer, and make sure it is 2249 * within the boundaries of the partition. Adjust transfer 2250 * if needed, and signal errors or early completion. 2251 */ 2252int 2253bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 2254{ 2255 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 2256 int labelsect = lp->d_partitions[0].p_offset; 2257 int maxsz = p->p_size, 2258 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2259 2260 /* overwriting disk label ? */ 2261 /* XXX should also protect bootstrap in first 8K */ 2262 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 2263#if LABELSECTOR != 0 2264 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2265#endif 2266 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2267 bp->b_error = EROFS; 2268 goto bad; 2269 } 2270 2271#if defined(DOSBBSECTOR) && defined(notyet) 2272 /* overwriting master boot record? */ 2273 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 2274 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 2275 bp->b_error = EROFS; 2276 goto bad; 2277 } 2278#endif 2279 2280 /* beyond partition? */ 2281 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 2282 /* if exactly at end of disk, return an EOF */ 2283 if (bp->b_blkno == maxsz) { 2284 bp->b_resid = bp->b_bcount; 2285 return(0); 2286 } 2287 /* or truncate if part of it fits */ 2288 sz = maxsz - bp->b_blkno; 2289 if (sz <= 0) { 2290 bp->b_error = EINVAL; 2291 goto bad; 2292 } 2293 bp->b_bcount = sz << DEV_BSHIFT; 2294 } 2295 2296 bp->b_pblkno = bp->b_blkno + p->p_offset; 2297 return(1); 2298 2299bad: 2300 bp->b_flags |= B_ERROR; 2301 return(-1); 2302} 2303 2304#ifdef DDB 2305 2306/* 2307 * Provide inb() and outb() as functions. They are normally only 2308 * available as macros calling inlined functions, thus cannot be 2309 * called inside DDB. 2310 * 2311 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2312 */ 2313 2314#undef inb 2315#undef outb 2316 2317/* silence compiler warnings */ 2318u_char inb(u_int); 2319void outb(u_int, u_char); 2320 2321u_char 2322inb(u_int port) 2323{ 2324 u_char data; 2325 /* 2326 * We use %%dx and not %1 here because i/o is done at %dx and not at 2327 * %edx, while gcc generates inferior code (movw instead of movl) 2328 * if we tell it to load (u_short) port. 2329 */ 2330 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2331 return (data); 2332} 2333 2334void 2335outb(u_int port, u_char data) 2336{ 2337 u_char al; 2338 /* 2339 * Use an unnecessary assignment to help gcc's register allocator. 2340 * This make a large difference for gcc-1.40 and a tiny difference 2341 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2342 * best results. gcc-2.6.0 can't handle this. 2343 */ 2344 al = data; 2345 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2346} 2347 2348#endif /* DDB */ 2349