2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 2018 The FreeBSD Foundation
5 * Copyright (c) 1992 Terrence R. Lambert.
6 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
9 * This code is derived from software contributed to Berkeley by
12 * Portions of this software were developed by A. Joseph Koshy under
13 * sponsorship from the FreeBSD Foundation and Google, Inc.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 * must display the following acknowledgement:
25 * This product includes software developed by the University of
26 * California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
50 #include "opt_atpic.h"
55 #include "opt_kstack_pages.h"
56 #include "opt_maxmem.h"
57 #include "opt_mp_watchdog.h"
58 #include "opt_perfmon.h"
59 #include "opt_platform.h"
61 #include <sys/param.h>
63 #include <sys/systm.h>
67 #include <sys/callout.h>
70 #include <sys/eventhandler.h>
72 #include <sys/imgact.h>
74 #include <sys/kernel.h>
76 #include <sys/linker.h>
78 #include <sys/malloc.h>
79 #include <sys/memrange.h>
80 #include <sys/msgbuf.h>
81 #include <sys/mutex.h>
83 #include <sys/ptrace.h>
84 #include <sys/reboot.h>
85 #include <sys/rwlock.h>
86 #include <sys/sched.h>
87 #include <sys/signalvar.h>
89 #include <sys/syscallsubr.h>
90 #include <sys/sysctl.h>
91 #include <sys/sysent.h>
92 #include <sys/sysproto.h>
93 #include <sys/ucontext.h>
94 #include <sys/vmmeter.h>
97 #include <vm/vm_extern.h>
98 #include <vm/vm_kern.h>
99 #include <vm/vm_page.h>
100 #include <vm/vm_map.h>
101 #include <vm/vm_object.h>
102 #include <vm/vm_pager.h>
103 #include <vm/vm_param.h>
104 #include <vm/vm_phys.h>
108 #error KDB must be enabled in order for DDB to work!
111 #include <ddb/db_sym.h>
116 #include <net/netisr.h>
118 #include <machine/bootinfo.h>
119 #include <machine/clock.h>
120 #include <machine/cpu.h>
121 #include <machine/cputypes.h>
122 #include <machine/intr_machdep.h>
124 #include <machine/md_var.h>
125 #include <machine/metadata.h>
126 #include <machine/mp_watchdog.h>
127 #include <machine/pc/bios.h>
128 #include <machine/pcb.h>
129 #include <machine/pcb_ext.h>
130 #include <machine/proc.h>
131 #include <machine/reg.h>
132 #include <machine/sigframe.h>
133 #include <machine/specialreg.h>
134 #include <machine/sysarch.h>
135 #include <machine/trap.h>
136 #include <machine/vm86.h>
137 #include <x86/init.h>
139 #include <machine/perfmon.h>
142 #include <machine/smp.h>
149 #include <x86/apicvar.h>
153 #include <x86/isa/icu.h>
156 /* Sanity check for __curthread() */
157 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
159 register_t init386(int first);
160 void dblfault_handler(void);
162 static void cpu_startup(void *);
163 static void fpstate_drop(struct thread *td);
164 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
165 char *xfpusave, size_t xfpusave_len);
166 static int set_fpcontext(struct thread *td, mcontext_t *mcp,
167 char *xfpustate, size_t xfpustate_len);
168 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
170 /* Intel ICH registers */
171 #define ICH_PMBASE 0x400
172 #define ICH_SMI_EN ICH_PMBASE + 0x30
174 int _udatasel, _ucodesel;
180 static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
182 #ifdef COMPAT_FREEBSD4
183 static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
190 FEATURE(pae, "Physical Address Extensions");
194 * The number of PHYSMAP entries must be one less than the number of
195 * PHYSSEG entries because the PHYSMAP entry that spans the largest
196 * physical address that is accessible by ISA DMA is split into two
199 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
201 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
202 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
204 /* must be 2 less so 0 0 can signal end of chunks */
205 #define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
206 #define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
208 struct kva_md_info kmi;
210 static struct trapframe proc0_tf;
211 struct pcpu __pcpu[MAXCPU];
215 struct mem_range_softc mem_range_softc;
217 extern char start_exceptions[], end_exceptions[];
219 extern struct sysentvec elf32_freebsd_sysvec;
221 /* Default init_ops implementation. */
222 struct init_ops init_ops = {
223 .early_clock_source_init = i8254_init,
224 .early_delay = i8254_delay,
226 .msi_init = msi_init,
238 * On MacBooks, we need to disallow the legacy USB circuit to
239 * generate an SMI# because this can cause several problems,
240 * namely: incorrect CPU frequency detection and failure to
242 * We do this by disabling a bit in the SMI_EN (SMI Control and
243 * Enable register) of the Intel ICH LPC Interface Bridge.
245 sysenv = kern_getenv("smbios.system.product");
246 if (sysenv != NULL) {
247 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
248 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
249 strncmp(sysenv, "MacBook4,1", 10) == 0 ||
250 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
251 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
252 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
253 strncmp(sysenv, "MacBookPro4,1", 13) == 0 ||
254 strncmp(sysenv, "Macmini1,1", 10) == 0) {
256 printf("Disabling LEGACY_USB_EN bit on "
258 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
264 * Good {morning,afternoon,evening,night}.
268 panicifcpuunsupported();
274 * Display physical memory if SMBIOS reports reasonable amount.
277 sysenv = kern_getenv("smbios.memory.enabled");
278 if (sysenv != NULL) {
279 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
282 if (memsize < ptoa((uintmax_t)vm_free_count()))
283 memsize = ptoa((uintmax_t)Maxmem);
284 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
285 realmem = atop(memsize);
288 * Display any holes after the first chunk of extended memory.
293 printf("Physical memory chunk(s):\n");
294 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
297 size = phys_avail[indx + 1] - phys_avail[indx];
299 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
300 (uintmax_t)phys_avail[indx],
301 (uintmax_t)phys_avail[indx + 1] - 1,
302 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
306 vm_ksubmap_init(&kmi);
308 printf("avail memory = %ju (%ju MB)\n",
309 ptoa((uintmax_t)vm_free_count()),
310 ptoa((uintmax_t)vm_free_count()) / 1048576);
313 * Set up buffers, so they can be used to read disk labels.
316 vm_pager_bufferinit();
321 * Send an interrupt to process.
323 * Stack is set up to allow sigcode stored
324 * at top to call routine, followed by call
325 * to sigreturn routine below. After sigreturn
326 * resets the signal mask, the stack, and the
327 * frame pointer, it returns to the user
332 osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
334 struct osigframe sf, *fp;
338 struct trapframe *regs;
344 PROC_LOCK_ASSERT(p, MA_OWNED);
345 sig = ksi->ksi_signo;
347 mtx_assert(&psp->ps_mtx, MA_OWNED);
349 oonstack = sigonstack(regs->tf_esp);
351 /* Allocate space for the signal handler context. */
352 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
353 SIGISMEMBER(psp->ps_sigonstack, sig)) {
354 fp = (struct osigframe *)((uintptr_t)td->td_sigstk.ss_sp +
355 td->td_sigstk.ss_size - sizeof(struct osigframe));
356 #if defined(COMPAT_43)
357 td->td_sigstk.ss_flags |= SS_ONSTACK;
360 fp = (struct osigframe *)regs->tf_esp - 1;
362 /* Build the argument list for the signal handler. */
364 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
365 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
366 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
367 /* Signal handler installed with SA_SIGINFO. */
368 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
369 sf.sf_siginfo.si_signo = sig;
370 sf.sf_siginfo.si_code = ksi->ksi_code;
371 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
374 /* Old FreeBSD-style arguments. */
375 sf.sf_arg2 = ksi->ksi_code;
376 sf.sf_addr = (register_t)ksi->ksi_addr;
377 sf.sf_ahu.sf_handler = catcher;
379 mtx_unlock(&psp->ps_mtx);
382 /* Save most if not all of trap frame. */
383 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
384 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
385 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
386 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
387 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
388 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
389 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
390 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
391 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
392 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
393 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
394 sf.sf_siginfo.si_sc.sc_gs = rgs();
395 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
397 /* Build the signal context to be used by osigreturn(). */
398 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
399 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
400 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
401 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
402 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
403 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
404 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
405 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
408 * If we're a vm86 process, we want to save the segment registers.
409 * We also change eflags to be our emulated eflags, not the actual
412 if (regs->tf_eflags & PSL_VM) {
413 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */
414 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
415 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
417 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
418 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
419 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
420 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
422 if (vm86->vm86_has_vme == 0)
423 sf.sf_siginfo.si_sc.sc_ps =
424 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
425 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
427 /* See sendsig() for comments. */
428 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
432 * Copy the sigframe out to the user's stack.
434 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
439 regs->tf_esp = (int)fp;
440 if (p->p_sysent->sv_sigcode_base != 0) {
441 regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
444 /* a.out sysentvec does not use shared page */
445 regs->tf_eip = p->p_sysent->sv_psstrings - szosigcode;
447 regs->tf_eflags &= ~(PSL_T | PSL_D);
448 regs->tf_cs = _ucodesel;
449 regs->tf_ds = _udatasel;
450 regs->tf_es = _udatasel;
451 regs->tf_fs = _udatasel;
453 regs->tf_ss = _udatasel;
455 mtx_lock(&psp->ps_mtx);
457 #endif /* COMPAT_43 */
459 #ifdef COMPAT_FREEBSD4
461 freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
463 struct sigframe4 sf, *sfp;
467 struct trapframe *regs;
473 PROC_LOCK_ASSERT(p, MA_OWNED);
474 sig = ksi->ksi_signo;
476 mtx_assert(&psp->ps_mtx, MA_OWNED);
478 oonstack = sigonstack(regs->tf_esp);
480 /* Save user context. */
481 bzero(&sf, sizeof(sf));
482 sf.sf_uc.uc_sigmask = *mask;
483 sf.sf_uc.uc_stack = td->td_sigstk;
484 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
485 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
486 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
487 sf.sf_uc.uc_mcontext.mc_gs = rgs();
488 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
489 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
490 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
491 bzero(sf.sf_uc.uc_mcontext.__spare__,
492 sizeof(sf.sf_uc.uc_mcontext.__spare__));
493 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
495 /* Allocate space for the signal handler context. */
496 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
497 SIGISMEMBER(psp->ps_sigonstack, sig)) {
498 sfp = (struct sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
499 td->td_sigstk.ss_size - sizeof(struct sigframe4));
500 #if defined(COMPAT_43)
501 td->td_sigstk.ss_flags |= SS_ONSTACK;
504 sfp = (struct sigframe4 *)regs->tf_esp - 1;
506 /* Build the argument list for the signal handler. */
508 sf.sf_ucontext = (register_t)&sfp->sf_uc;
509 bzero(&sf.sf_si, sizeof(sf.sf_si));
510 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
511 /* Signal handler installed with SA_SIGINFO. */
512 sf.sf_siginfo = (register_t)&sfp->sf_si;
513 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
515 /* Fill in POSIX parts */
516 sf.sf_si.si_signo = sig;
517 sf.sf_si.si_code = ksi->ksi_code;
518 sf.sf_si.si_addr = ksi->ksi_addr;
520 /* Old FreeBSD-style arguments. */
521 sf.sf_siginfo = ksi->ksi_code;
522 sf.sf_addr = (register_t)ksi->ksi_addr;
523 sf.sf_ahu.sf_handler = catcher;
525 mtx_unlock(&psp->ps_mtx);
529 * If we're a vm86 process, we want to save the segment registers.
530 * We also change eflags to be our emulated eflags, not the actual
533 if (regs->tf_eflags & PSL_VM) {
534 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
535 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
537 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
538 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
539 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
540 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
542 if (vm86->vm86_has_vme == 0)
543 sf.sf_uc.uc_mcontext.mc_eflags =
544 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
545 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
548 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
549 * syscalls made by the signal handler. This just avoids
550 * wasting time for our lazy fixup of such faults. PSL_NT
551 * does nothing in vm86 mode, but vm86 programs can set it
552 * almost legitimately in probes for old cpu types.
554 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
558 * Copy the sigframe out to the user's stack.
560 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
565 regs->tf_esp = (int)sfp;
566 regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
568 regs->tf_eflags &= ~(PSL_T | PSL_D);
569 regs->tf_cs = _ucodesel;
570 regs->tf_ds = _udatasel;
571 regs->tf_es = _udatasel;
572 regs->tf_fs = _udatasel;
573 regs->tf_ss = _udatasel;
575 mtx_lock(&psp->ps_mtx);
577 #endif /* COMPAT_FREEBSD4 */
580 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
582 struct sigframe sf, *sfp;
587 struct trapframe *regs;
588 struct segment_descriptor *sdp;
596 PROC_LOCK_ASSERT(p, MA_OWNED);
597 sig = ksi->ksi_signo;
599 mtx_assert(&psp->ps_mtx, MA_OWNED);
600 #ifdef COMPAT_FREEBSD4
601 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
602 freebsd4_sendsig(catcher, ksi, mask);
607 if (SIGISMEMBER(psp->ps_osigset, sig)) {
608 osendsig(catcher, ksi, mask);
613 oonstack = sigonstack(regs->tf_esp);
615 if (cpu_max_ext_state_size > sizeof(union savefpu) && use_xsave) {
616 xfpusave_len = cpu_max_ext_state_size - sizeof(union savefpu);
617 xfpusave = __builtin_alloca(xfpusave_len);
623 /* Save user context. */
624 bzero(&sf, sizeof(sf));
625 sf.sf_uc.uc_sigmask = *mask;
626 sf.sf_uc.uc_stack = td->td_sigstk;
627 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
628 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
629 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
630 sf.sf_uc.uc_mcontext.mc_gs = rgs();
631 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
632 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
633 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
636 * Unconditionally fill the fsbase and gsbase into the mcontext.
638 sdp = &td->td_pcb->pcb_fsd;
639 sf.sf_uc.uc_mcontext.mc_fsbase = sdp->sd_hibase << 24 |
641 sdp = &td->td_pcb->pcb_gsd;
642 sf.sf_uc.uc_mcontext.mc_gsbase = sdp->sd_hibase << 24 |
644 bzero(sf.sf_uc.uc_mcontext.mc_spare2,
645 sizeof(sf.sf_uc.uc_mcontext.mc_spare2));
646 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
648 /* Allocate space for the signal handler context. */
649 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
650 SIGISMEMBER(psp->ps_sigonstack, sig)) {
651 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
652 #if defined(COMPAT_43)
653 td->td_sigstk.ss_flags |= SS_ONSTACK;
656 sp = (char *)regs->tf_esp - 128;
657 if (xfpusave != NULL) {
659 sp = (char *)((unsigned int)sp & ~0x3F);
660 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
662 sp -= sizeof(struct sigframe);
664 /* Align to 16 bytes. */
665 sfp = (struct sigframe *)((unsigned int)sp & ~0xF);
667 /* Build the argument list for the signal handler. */
669 sf.sf_ucontext = (register_t)&sfp->sf_uc;
670 bzero(&sf.sf_si, sizeof(sf.sf_si));
671 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
672 /* Signal handler installed with SA_SIGINFO. */
673 sf.sf_siginfo = (register_t)&sfp->sf_si;
674 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
676 /* Fill in POSIX parts */
677 sf.sf_si = ksi->ksi_info;
678 sf.sf_si.si_signo = sig; /* maybe a translated signal */
680 /* Old FreeBSD-style arguments. */
681 sf.sf_siginfo = ksi->ksi_code;
682 sf.sf_addr = (register_t)ksi->ksi_addr;
683 sf.sf_ahu.sf_handler = catcher;
685 mtx_unlock(&psp->ps_mtx);
689 * If we're a vm86 process, we want to save the segment registers.
690 * We also change eflags to be our emulated eflags, not the actual
693 if (regs->tf_eflags & PSL_VM) {
694 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
695 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
697 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
698 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
699 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
700 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
702 if (vm86->vm86_has_vme == 0)
703 sf.sf_uc.uc_mcontext.mc_eflags =
704 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
705 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
708 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
709 * syscalls made by the signal handler. This just avoids
710 * wasting time for our lazy fixup of such faults. PSL_NT
711 * does nothing in vm86 mode, but vm86 programs can set it
712 * almost legitimately in probes for old cpu types.
714 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
718 * Copy the sigframe out to the user's stack.
720 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
721 (xfpusave != NULL && copyout(xfpusave,
722 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
728 regs->tf_esp = (int)sfp;
729 regs->tf_eip = p->p_sysent->sv_sigcode_base;
730 if (regs->tf_eip == 0)
731 regs->tf_eip = p->p_sysent->sv_psstrings - szsigcode;
732 regs->tf_eflags &= ~(PSL_T | PSL_D);
733 regs->tf_cs = _ucodesel;
734 regs->tf_ds = _udatasel;
735 regs->tf_es = _udatasel;
736 regs->tf_fs = _udatasel;
737 regs->tf_ss = _udatasel;
739 mtx_lock(&psp->ps_mtx);
743 * System call to cleanup state after a signal
744 * has been taken. Reset signal mask and
745 * stack state from context left by sendsig (above).
746 * Return to previous pc and psl as specified by
747 * context left by sendsig. Check carefully to
748 * make sure that the user has not modified the
749 * state to gain improper privileges.
757 struct osigreturn_args /* {
758 struct osigcontext *sigcntxp;
761 struct osigcontext sc;
762 struct trapframe *regs;
763 struct osigcontext *scp;
768 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
773 if (eflags & PSL_VM) {
774 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
775 struct vm86_kernel *vm86;
778 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
779 * set up the vm86 area, and we can't enter vm86 mode.
781 if (td->td_pcb->pcb_ext == 0)
783 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
784 if (vm86->vm86_inited == 0)
787 /* Go back to user mode if both flags are set. */
788 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
789 ksiginfo_init_trap(&ksi);
790 ksi.ksi_signo = SIGBUS;
791 ksi.ksi_code = BUS_OBJERR;
792 ksi.ksi_addr = (void *)regs->tf_eip;
793 trapsignal(td, &ksi);
796 if (vm86->vm86_has_vme) {
797 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
798 (eflags & VME_USERCHANGE) | PSL_VM;
800 vm86->vm86_eflags = eflags; /* save VIF, VIP */
801 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
802 (eflags & VM_USERCHANGE) | PSL_VM;
804 tf->tf_vm86_ds = scp->sc_ds;
805 tf->tf_vm86_es = scp->sc_es;
806 tf->tf_vm86_fs = scp->sc_fs;
807 tf->tf_vm86_gs = scp->sc_gs;
808 tf->tf_ds = _udatasel;
809 tf->tf_es = _udatasel;
810 tf->tf_fs = _udatasel;
813 * Don't allow users to change privileged or reserved flags.
815 if (!EFL_SECURE(eflags, regs->tf_eflags)) {
820 * Don't allow users to load a valid privileged %cs. Let the
821 * hardware check for invalid selectors, excess privilege in
822 * other selectors, invalid %eip's and invalid %esp's.
824 if (!CS_SECURE(scp->sc_cs)) {
825 ksiginfo_init_trap(&ksi);
826 ksi.ksi_signo = SIGBUS;
827 ksi.ksi_code = BUS_OBJERR;
828 ksi.ksi_trapno = T_PROTFLT;
829 ksi.ksi_addr = (void *)regs->tf_eip;
830 trapsignal(td, &ksi);
833 regs->tf_ds = scp->sc_ds;
834 regs->tf_es = scp->sc_es;
835 regs->tf_fs = scp->sc_fs;
838 /* Restore remaining registers. */
839 regs->tf_eax = scp->sc_eax;
840 regs->tf_ebx = scp->sc_ebx;
841 regs->tf_ecx = scp->sc_ecx;
842 regs->tf_edx = scp->sc_edx;
843 regs->tf_esi = scp->sc_esi;
844 regs->tf_edi = scp->sc_edi;
845 regs->tf_cs = scp->sc_cs;
846 regs->tf_ss = scp->sc_ss;
847 regs->tf_isp = scp->sc_isp;
848 regs->tf_ebp = scp->sc_fp;
849 regs->tf_esp = scp->sc_sp;
850 regs->tf_eip = scp->sc_pc;
851 regs->tf_eflags = eflags;
853 #if defined(COMPAT_43)
854 if (scp->sc_onstack & 1)
855 td->td_sigstk.ss_flags |= SS_ONSTACK;
857 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
859 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
861 return (EJUSTRETURN);
863 #endif /* COMPAT_43 */
865 #ifdef COMPAT_FREEBSD4
870 freebsd4_sigreturn(td, uap)
872 struct freebsd4_sigreturn_args /* {
873 const ucontext4 *sigcntxp;
877 struct trapframe *regs;
878 struct ucontext4 *ucp;
879 int cs, eflags, error;
882 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
887 eflags = ucp->uc_mcontext.mc_eflags;
888 if (eflags & PSL_VM) {
889 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
890 struct vm86_kernel *vm86;
893 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
894 * set up the vm86 area, and we can't enter vm86 mode.
896 if (td->td_pcb->pcb_ext == 0)
898 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
899 if (vm86->vm86_inited == 0)
902 /* Go back to user mode if both flags are set. */
903 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
904 ksiginfo_init_trap(&ksi);
905 ksi.ksi_signo = SIGBUS;
906 ksi.ksi_code = BUS_OBJERR;
907 ksi.ksi_addr = (void *)regs->tf_eip;
908 trapsignal(td, &ksi);
910 if (vm86->vm86_has_vme) {
911 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
912 (eflags & VME_USERCHANGE) | PSL_VM;
914 vm86->vm86_eflags = eflags; /* save VIF, VIP */
915 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
916 (eflags & VM_USERCHANGE) | PSL_VM;
918 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
919 tf->tf_eflags = eflags;
920 tf->tf_vm86_ds = tf->tf_ds;
921 tf->tf_vm86_es = tf->tf_es;
922 tf->tf_vm86_fs = tf->tf_fs;
923 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
924 tf->tf_ds = _udatasel;
925 tf->tf_es = _udatasel;
926 tf->tf_fs = _udatasel;
929 * Don't allow users to change privileged or reserved flags.
931 if (!EFL_SECURE(eflags, regs->tf_eflags)) {
932 uprintf("pid %d (%s): freebsd4_sigreturn eflags = 0x%x\n",
933 td->td_proc->p_pid, td->td_name, eflags);
938 * Don't allow users to load a valid privileged %cs. Let the
939 * hardware check for invalid selectors, excess privilege in
940 * other selectors, invalid %eip's and invalid %esp's.
942 cs = ucp->uc_mcontext.mc_cs;
943 if (!CS_SECURE(cs)) {
944 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
945 td->td_proc->p_pid, td->td_name, cs);
946 ksiginfo_init_trap(&ksi);
947 ksi.ksi_signo = SIGBUS;
948 ksi.ksi_code = BUS_OBJERR;
949 ksi.ksi_trapno = T_PROTFLT;
950 ksi.ksi_addr = (void *)regs->tf_eip;
951 trapsignal(td, &ksi);
955 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
958 #if defined(COMPAT_43)
959 if (ucp->uc_mcontext.mc_onstack & 1)
960 td->td_sigstk.ss_flags |= SS_ONSTACK;
962 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
964 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
965 return (EJUSTRETURN);
967 #endif /* COMPAT_FREEBSD4 */
973 sys_sigreturn(td, uap)
975 struct sigreturn_args /* {
976 const struct __ucontext *sigcntxp;
981 struct trapframe *regs;
984 size_t xfpustate_len;
985 int cs, eflags, error, ret;
990 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
994 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
995 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
996 td->td_name, ucp->uc_mcontext.mc_flags);
1000 eflags = ucp->uc_mcontext.mc_eflags;
1001 if (eflags & PSL_VM) {
1002 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
1003 struct vm86_kernel *vm86;
1006 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
1007 * set up the vm86 area, and we can't enter vm86 mode.
1009 if (td->td_pcb->pcb_ext == 0)
1011 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
1012 if (vm86->vm86_inited == 0)
1015 /* Go back to user mode if both flags are set. */
1016 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
1017 ksiginfo_init_trap(&ksi);
1018 ksi.ksi_signo = SIGBUS;
1019 ksi.ksi_code = BUS_OBJERR;
1020 ksi.ksi_addr = (void *)regs->tf_eip;
1021 trapsignal(td, &ksi);
1024 if (vm86->vm86_has_vme) {
1025 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
1026 (eflags & VME_USERCHANGE) | PSL_VM;
1028 vm86->vm86_eflags = eflags; /* save VIF, VIP */
1029 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
1030 (eflags & VM_USERCHANGE) | PSL_VM;
1032 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
1033 tf->tf_eflags = eflags;
1034 tf->tf_vm86_ds = tf->tf_ds;
1035 tf->tf_vm86_es = tf->tf_es;
1036 tf->tf_vm86_fs = tf->tf_fs;
1037 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
1038 tf->tf_ds = _udatasel;
1039 tf->tf_es = _udatasel;
1040 tf->tf_fs = _udatasel;
1043 * Don't allow users to change privileged or reserved flags.
1045 if (!EFL_SECURE(eflags, regs->tf_eflags)) {
1046 uprintf("pid %d (%s): sigreturn eflags = 0x%x\n",
1047 td->td_proc->p_pid, td->td_name, eflags);
1052 * Don't allow users to load a valid privileged %cs. Let the
1053 * hardware check for invalid selectors, excess privilege in
1054 * other selectors, invalid %eip's and invalid %esp's.
1056 cs = ucp->uc_mcontext.mc_cs;
1057 if (!CS_SECURE(cs)) {
1058 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
1059 td->td_proc->p_pid, td->td_name, cs);
1060 ksiginfo_init_trap(&ksi);
1061 ksi.ksi_signo = SIGBUS;
1062 ksi.ksi_code = BUS_OBJERR;
1063 ksi.ksi_trapno = T_PROTFLT;
1064 ksi.ksi_addr = (void *)regs->tf_eip;
1065 trapsignal(td, &ksi);
1069 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
1070 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
1071 if (xfpustate_len > cpu_max_ext_state_size -
1072 sizeof(union savefpu)) {
1074 "pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
1075 p->p_pid, td->td_name, xfpustate_len);
1078 xfpustate = __builtin_alloca(xfpustate_len);
1079 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate,
1080 xfpustate, xfpustate_len);
1083 "pid %d (%s): sigreturn copying xfpustate failed\n",
1084 p->p_pid, td->td_name);
1091 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
1095 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
1098 #if defined(COMPAT_43)
1099 if (ucp->uc_mcontext.mc_onstack & 1)
1100 td->td_sigstk.ss_flags |= SS_ONSTACK;
1102 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
1105 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
1106 return (EJUSTRETURN);
1111 setup_priv_lcall_gate(struct proc *p)
1113 struct i386_ldt_args uap;
1114 union descriptor desc;
1117 bzero(&uap, sizeof(uap));
1120 lcall_addr = p->p_sysent->sv_psstrings - sz_lcall_tramp;
1121 bzero(&desc, sizeof(desc));
1122 desc.sd.sd_type = SDT_MEMERA;
1123 desc.sd.sd_dpl = SEL_UPL;
1125 desc.sd.sd_def32 = 1;
1126 desc.sd.sd_gran = 1;
1127 desc.sd.sd_lolimit = 0xffff;
1128 desc.sd.sd_hilimit = 0xf;
1129 desc.sd.sd_lobase = lcall_addr;
1130 desc.sd.sd_hibase = lcall_addr >> 24;
1131 i386_set_ldt(curthread, &uap, &desc);
1136 * Reset registers to default values on exec.
1139 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
1141 struct trapframe *regs;
1143 register_t saved_eflags;
1145 regs = td->td_frame;
1148 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
1149 pcb->pcb_gs = _udatasel;
1152 mtx_lock_spin(&dt_lock);
1153 if (td->td_proc->p_md.md_ldt != NULL)
1156 mtx_unlock_spin(&dt_lock);
1159 if (td->td_proc->p_sysent->sv_psstrings !=
1160 elf32_freebsd_sysvec.sv_psstrings)
1161 setup_priv_lcall_gate(td->td_proc);
1165 * Reset the fs and gs bases. The values from the old address
1166 * space do not make sense for the new program. In particular,
1167 * gsbase might be the TLS base for the old program but the new
1168 * program has no TLS now.
1173 /* Make sure edx is 0x0 on entry. Linux binaries depend on it. */
1174 saved_eflags = regs->tf_eflags & PSL_T;
1175 bzero((char *)regs, sizeof(struct trapframe));
1176 regs->tf_eip = imgp->entry_addr;
1177 regs->tf_esp = stack;
1178 regs->tf_eflags = PSL_USER | saved_eflags;
1179 regs->tf_ss = _udatasel;
1180 regs->tf_ds = _udatasel;
1181 regs->tf_es = _udatasel;
1182 regs->tf_fs = _udatasel;
1183 regs->tf_cs = _ucodesel;
1185 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1186 regs->tf_ebx = imgp->ps_strings;
1189 * Reset the hardware debug registers if they were in use.
1190 * They won't have any meaning for the newly exec'd process.
1192 if (pcb->pcb_flags & PCB_DBREGS) {
1199 if (pcb == curpcb) {
1201 * Clear the debug registers on the running
1202 * CPU, otherwise they will end up affecting
1203 * the next process we switch to.
1207 pcb->pcb_flags &= ~PCB_DBREGS;
1210 pcb->pcb_initial_npxcw = __INITIAL_NPXCW__;
1213 * Drop the FP state if we hold it, so that the process gets a
1214 * clean FP state if it uses the FPU again.
1227 * CR0_MP, CR0_NE and CR0_TS are set for NPX (FPU) support:
1229 * Prepare to trap all ESC (i.e., NPX) instructions and all WAIT
1230 * instructions. We must set the CR0_MP bit and use the CR0_TS
1231 * bit to control the trap, because setting the CR0_EM bit does
1232 * not cause WAIT instructions to trap. It's important to trap
1233 * WAIT instructions - otherwise the "wait" variants of no-wait
1234 * control instructions would degenerate to the "no-wait" variants
1235 * after FP context switches but work correctly otherwise. It's
1236 * particularly important to trap WAITs when there is no NPX -
1237 * otherwise the "wait" variants would always degenerate.
1239 * Try setting CR0_NE to get correct error reporting on 486DX's.
1240 * Setting it should fail or do nothing on lesser processors.
1242 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
1247 u_long bootdev; /* not a struct cdev *- encoding is different */
1248 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1249 CTLFLAG_RD, &bootdev, 0, "Maybe the Boot device (not in struct cdev *format)");
1251 static char bootmethod[16] = "BIOS";
1252 SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0,
1253 "System firmware boot method");
1256 * Initialize 386 and configure to run kernel
1260 * Initialize segments & interrupt table
1265 struct mtx dt_lock; /* lock for GDT and LDT */
1267 union descriptor gdt0[NGDT]; /* initial global descriptor table */
1268 union descriptor *gdt = gdt0; /* global descriptor table */
1270 union descriptor *ldt; /* local descriptor table */
1272 static struct gate_descriptor idt0[NIDT];
1273 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1275 static struct i386tss *dblfault_tss;
1276 static char *dblfault_stack;
1278 static struct i386tss common_tss0;
1280 vm_offset_t proc0kstack;
1283 * software prototypes -- in more palatable form.
1285 * GCODE_SEL through GUDATA_SEL must be in this order for syscall/sysret
1286 * GUFS_SEL and GUGS_SEL must be in this order (swtch.s knows it)
1288 struct soft_segment_descriptor gdt_segs[] = {
1289 /* GNULL_SEL 0 Null Descriptor */
1295 .ssd_xx = 0, .ssd_xx1 = 0,
1298 /* GPRIV_SEL 1 SMP Per-Processor Private Data Descriptor */
1300 .ssd_limit = 0xfffff,
1301 .ssd_type = SDT_MEMRWA,
1304 .ssd_xx = 0, .ssd_xx1 = 0,
1307 /* GUFS_SEL 2 %fs Descriptor for user */
1309 .ssd_limit = 0xfffff,
1310 .ssd_type = SDT_MEMRWA,
1313 .ssd_xx = 0, .ssd_xx1 = 0,
1316 /* GUGS_SEL 3 %gs Descriptor for user */
1318 .ssd_limit = 0xfffff,
1319 .ssd_type = SDT_MEMRWA,
1322 .ssd_xx = 0, .ssd_xx1 = 0,
1325 /* GCODE_SEL 4 Code Descriptor for kernel */
1327 .ssd_limit = 0xfffff,
1328 .ssd_type = SDT_MEMERA,
1331 .ssd_xx = 0, .ssd_xx1 = 0,
1334 /* GDATA_SEL 5 Data Descriptor for kernel */
1336 .ssd_limit = 0xfffff,
1337 .ssd_type = SDT_MEMRWA,
1340 .ssd_xx = 0, .ssd_xx1 = 0,
1343 /* GUCODE_SEL 6 Code Descriptor for user */
1345 .ssd_limit = 0xfffff,
1346 .ssd_type = SDT_MEMERA,
1349 .ssd_xx = 0, .ssd_xx1 = 0,
1352 /* GUDATA_SEL 7 Data Descriptor for user */
1354 .ssd_limit = 0xfffff,
1355 .ssd_type = SDT_MEMRWA,
1358 .ssd_xx = 0, .ssd_xx1 = 0,
1361 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1362 { .ssd_base = 0x400,
1363 .ssd_limit = 0xfffff,
1364 .ssd_type = SDT_MEMRWA,
1367 .ssd_xx = 0, .ssd_xx1 = 0,
1370 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
1373 .ssd_limit = sizeof(struct i386tss)-1,
1374 .ssd_type = SDT_SYS386TSS,
1377 .ssd_xx = 0, .ssd_xx1 = 0,
1380 /* GLDT_SEL 10 LDT Descriptor */
1382 .ssd_limit = sizeof(union descriptor) * NLDT - 1,
1383 .ssd_type = SDT_SYSLDT,
1386 .ssd_xx = 0, .ssd_xx1 = 0,
1389 /* GUSERLDT_SEL 11 User LDT Descriptor per process */
1391 .ssd_limit = (512 * sizeof(union descriptor)-1),
1392 .ssd_type = SDT_SYSLDT,
1395 .ssd_xx = 0, .ssd_xx1 = 0,
1398 /* GPANIC_SEL 12 Panic Tss Descriptor */
1400 .ssd_limit = sizeof(struct i386tss)-1,
1401 .ssd_type = SDT_SYS386TSS,
1404 .ssd_xx = 0, .ssd_xx1 = 0,
1407 /* GBIOSCODE32_SEL 13 BIOS 32-bit interface (32bit Code) */
1409 .ssd_limit = 0xfffff,
1410 .ssd_type = SDT_MEMERA,
1413 .ssd_xx = 0, .ssd_xx1 = 0,
1416 /* GBIOSCODE16_SEL 14 BIOS 32-bit interface (16bit Code) */
1418 .ssd_limit = 0xfffff,
1419 .ssd_type = SDT_MEMERA,
1422 .ssd_xx = 0, .ssd_xx1 = 0,
1425 /* GBIOSDATA_SEL 15 BIOS 32-bit interface (Data) */
1427 .ssd_limit = 0xfffff,
1428 .ssd_type = SDT_MEMRWA,
1431 .ssd_xx = 0, .ssd_xx1 = 0,
1434 /* GBIOSUTIL_SEL 16 BIOS 16-bit interface (Utility) */
1436 .ssd_limit = 0xfffff,
1437 .ssd_type = SDT_MEMRWA,
1440 .ssd_xx = 0, .ssd_xx1 = 0,
1443 /* GBIOSARGS_SEL 17 BIOS 16-bit interface (Arguments) */
1445 .ssd_limit = 0xfffff,
1446 .ssd_type = SDT_MEMRWA,
1449 .ssd_xx = 0, .ssd_xx1 = 0,
1452 /* GNDIS_SEL 18 NDIS Descriptor */
1458 .ssd_xx = 0, .ssd_xx1 = 0,
1463 static struct soft_segment_descriptor ldt_segs[] = {
1464 /* Null Descriptor - overwritten by call gate */
1470 .ssd_xx = 0, .ssd_xx1 = 0,
1473 /* Null Descriptor - overwritten by call gate */
1479 .ssd_xx = 0, .ssd_xx1 = 0,
1482 /* Null Descriptor - overwritten by call gate */
1488 .ssd_xx = 0, .ssd_xx1 = 0,
1491 /* Code Descriptor for user */
1493 .ssd_limit = 0xfffff,
1494 .ssd_type = SDT_MEMERA,
1497 .ssd_xx = 0, .ssd_xx1 = 0,
1500 /* Null Descriptor - overwritten by call gate */
1506 .ssd_xx = 0, .ssd_xx1 = 0,
1509 /* Data Descriptor for user */
1511 .ssd_limit = 0xfffff,
1512 .ssd_type = SDT_MEMRWA,
1515 .ssd_xx = 0, .ssd_xx1 = 0,
1520 uintptr_t setidt_disp;
1523 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1527 off = func != NULL ? (uintptr_t)func + setidt_disp : 0;
1528 setidt_nodisp(idx, off, typ, dpl, selec);
1532 setidt_nodisp(int idx, uintptr_t off, int typ, int dpl, int selec)
1534 struct gate_descriptor *ip;
1537 ip->gd_looffset = off;
1538 ip->gd_selector = selec;
1544 ip->gd_hioffset = ((u_int)off) >> 16 ;
1548 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1549 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1550 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1551 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1553 #ifdef KDTRACE_HOOKS
1557 IDTVEC(xen_intr_upcall),
1559 IDTVEC(int0x80_syscall);
1563 * Display the index and function name of any IDT entries that don't use
1564 * the default 'rsvd' entry point.
1566 DB_SHOW_COMMAND(idt, db_show_idt)
1568 struct gate_descriptor *ip;
1570 uintptr_t func, func_trm;
1574 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1575 if (ip->gd_type == SDT_SYSTASKGT) {
1576 db_printf("%3d\t<TASK>\n", idx);
1578 func = (ip->gd_hioffset << 16 | ip->gd_looffset);
1579 if (func >= PMAP_TRM_MIN_ADDRESS) {
1581 func -= setidt_disp;
1585 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1586 db_printf("%3d\t", idx);
1587 db_printsym(func, DB_STGY_PROC);
1589 db_printf(" (trampoline %#x)",
1598 /* Show privileged registers. */
1599 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
1601 uint64_t idtr, gdtr;
1604 db_printf("idtr\t0x%08x/%04x\n",
1605 (u_int)(idtr >> 16), (u_int)idtr & 0xffff);
1607 db_printf("gdtr\t0x%08x/%04x\n",
1608 (u_int)(gdtr >> 16), (u_int)gdtr & 0xffff);
1609 db_printf("ldtr\t0x%04x\n", rldt());
1610 db_printf("tr\t0x%04x\n", rtr());
1611 db_printf("cr0\t0x%08x\n", rcr0());
1612 db_printf("cr2\t0x%08x\n", rcr2());
1613 db_printf("cr3\t0x%08x\n", rcr3());
1614 db_printf("cr4\t0x%08x\n", rcr4());
1615 if (rcr4() & CR4_XSAVE)
1616 db_printf("xcr0\t0x%016llx\n", rxcr(0));
1617 if (amd_feature & (AMDID_NX | AMDID_LM))
1618 db_printf("EFER\t0x%016llx\n", rdmsr(MSR_EFER));
1619 if (cpu_feature2 & (CPUID2_VMX | CPUID2_SMX))
1620 db_printf("FEATURES_CTL\t0x%016llx\n",
1621 rdmsr(MSR_IA32_FEATURE_CONTROL));
1622 if ((cpu_vendor_id == CPU_VENDOR_INTEL ||
1623 cpu_vendor_id == CPU_VENDOR_AMD) && CPUID_TO_FAMILY(cpu_id) >= 6)
1624 db_printf("DEBUG_CTL\t0x%016llx\n", rdmsr(MSR_DEBUGCTLMSR));
1625 if (cpu_feature & CPUID_PAT)
1626 db_printf("PAT\t0x%016llx\n", rdmsr(MSR_PAT));
1629 DB_SHOW_COMMAND(dbregs, db_show_dbregs)
1632 db_printf("dr0\t0x%08x\n", rdr0());
1633 db_printf("dr1\t0x%08x\n", rdr1());
1634 db_printf("dr2\t0x%08x\n", rdr2());
1635 db_printf("dr3\t0x%08x\n", rdr3());
1636 db_printf("dr6\t0x%08x\n", rdr6());
1637 db_printf("dr7\t0x%08x\n", rdr7());
1640 DB_SHOW_COMMAND(frame, db_show_frame)
1642 struct trapframe *frame;
1644 frame = have_addr ? (struct trapframe *)addr : curthread->td_frame;
1645 printf("ss %#x esp %#x efl %#x cs %#x eip %#x\n",
1646 frame->tf_ss, frame->tf_esp, frame->tf_eflags, frame->tf_cs,
1648 printf("err %#x trapno %d\n", frame->tf_err, frame->tf_trapno);
1649 printf("ds %#x es %#x fs %#x\n",
1650 frame->tf_ds, frame->tf_es, frame->tf_fs);
1651 printf("eax %#x ecx %#x edx %#x ebx %#x\n",
1652 frame->tf_eax, frame->tf_ecx, frame->tf_edx, frame->tf_ebx);
1653 printf("ebp %#x esi %#x edi %#x\n",
1654 frame->tf_ebp, frame->tf_esi, frame->tf_edi);
1661 struct segment_descriptor *sd;
1662 struct soft_segment_descriptor *ssd;
1664 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1665 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1666 ssd->ssd_type = sd->sd_type;
1667 ssd->ssd_dpl = sd->sd_dpl;
1668 ssd->ssd_p = sd->sd_p;
1669 ssd->ssd_def32 = sd->sd_def32;
1670 ssd->ssd_gran = sd->sd_gran;
1674 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
1677 int i, insert_idx, physmap_idx;
1679 physmap_idx = *physmap_idxp;
1685 if (base > 0xffffffff) {
1686 printf("%uK of memory above 4GB ignored\n",
1687 (u_int)(length / 1024));
1693 * Find insertion point while checking for overlap. Start off by
1694 * assuming the new entry will be added to the end.
1696 insert_idx = physmap_idx + 2;
1697 for (i = 0; i <= physmap_idx; i += 2) {
1698 if (base < physmap[i + 1]) {
1699 if (base + length <= physmap[i]) {
1703 if (boothowto & RB_VERBOSE)
1705 "Overlapping memory regions, ignoring second region\n");
1710 /* See if we can prepend to the next entry. */
1711 if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) {
1712 physmap[insert_idx] = base;
1716 /* See if we can append to the previous entry. */
1717 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
1718 physmap[insert_idx - 1] += length;
1723 *physmap_idxp = physmap_idx;
1724 if (physmap_idx == PHYSMAP_SIZE) {
1726 "Too many segments in the physical address map, giving up\n");
1731 * Move the last 'N' entries down to make room for the new
1734 for (i = physmap_idx; i > insert_idx; i -= 2) {
1735 physmap[i] = physmap[i - 2];
1736 physmap[i + 1] = physmap[i - 1];
1739 /* Insert the new entry. */
1740 physmap[insert_idx] = base;
1741 physmap[insert_idx + 1] = base + length;
1746 add_smap_entry(struct bios_smap *smap, vm_paddr_t *physmap, int *physmap_idxp)
1748 if (boothowto & RB_VERBOSE)
1749 printf("SMAP type=%02x base=%016llx len=%016llx\n",
1750 smap->type, smap->base, smap->length);
1752 if (smap->type != SMAP_TYPE_MEMORY)
1755 return (add_physmap_entry(smap->base, smap->length, physmap,
1760 add_smap_entries(struct bios_smap *smapbase, vm_paddr_t *physmap,
1763 struct bios_smap *smap, *smapend;
1766 * Memory map from INT 15:E820.
1768 * subr_module.c says:
1769 * "Consumer may safely assume that size value precedes data."
1770 * ie: an int32_t immediately precedes SMAP.
1772 smapsize = *((u_int32_t *)smapbase - 1);
1773 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1775 for (smap = smapbase; smap < smapend; smap++)
1776 if (!add_smap_entry(smap, physmap, physmap_idxp))
1786 if (basemem > 640) {
1787 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1793 * Map pages between basemem and ISA_HOLE_START, if any, r/w into
1794 * the vm86 page table so that vm86 can scribble on them using
1795 * the vm86 map too. XXX: why 2 ways for this and only 1 way for
1796 * page 0, at least as initialized here?
1798 pte = (pt_entry_t *)vm86paddr;
1799 for (i = basemem / 4; i < 160; i++)
1800 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1804 * Populate the (physmap) array with base/bound pairs describing the
1805 * available physical memory in the system, then test this memory and
1806 * build the phys_avail array describing the actually-available memory.
1808 * If we cannot accurately determine the physical memory map, then use
1809 * value from the 0xE801 call, and failing that, the RTC.
1811 * Total memory size may be set by the kernel environment variable
1812 * hw.physmem or the compile-time define MAXMEM.
1814 * XXX first should be vm_paddr_t.
1817 getmemsize(int first)
1819 int has_smap, off, physmap_idx, pa_indx, da_indx;
1821 vm_paddr_t physmap[PHYSMAP_SIZE];
1823 quad_t dcons_addr, dcons_size, physmem_tunable;
1824 int hasbrokenint12, i, res;
1826 struct vm86frame vmf;
1827 struct vm86context vmc;
1829 struct bios_smap *smap, *smapbase;
1833 bzero(&vmf, sizeof(vmf));
1834 bzero(physmap, sizeof(physmap));
1838 * Tell the physical memory allocator about pages used to store
1839 * the kernel and preloaded data. See kmem_bootstrap_free().
1841 vm_phys_add_seg((vm_paddr_t)KERNLOAD, trunc_page(first));
1844 * Check if the loader supplied an SMAP memory map. If so,
1845 * use that and do not make any VM86 calls.
1848 kmdp = preload_search_by_type("elf kernel");
1850 kmdp = preload_search_by_type("elf32 kernel");
1851 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1852 MODINFO_METADATA | MODINFOMD_SMAP);
1853 if (smapbase != NULL) {
1854 add_smap_entries(smapbase, physmap, &physmap_idx);
1860 * Some newer BIOSes have a broken INT 12H implementation
1861 * which causes a kernel panic immediately. In this case, we
1862 * need use the SMAP to determine the base memory size.
1865 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1866 if (hasbrokenint12 == 0) {
1867 /* Use INT12 to determine base memory size. */
1868 vm86_intcall(0x12, &vmf);
1869 basemem = vmf.vmf_ax;
1874 * Fetch the memory map with INT 15:E820. Map page 1 R/W into
1875 * the kernel page table so we can use it as a buffer. The
1876 * kernel will unmap this page later.
1879 smap = (void *)vm86_addpage(&vmc, 1, PMAP_MAP_LOW + ptoa(1));
1880 res = vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1881 KASSERT(res != 0, ("vm86_getptr() failed: address not found"));
1885 vmf.vmf_eax = 0xE820;
1886 vmf.vmf_edx = SMAP_SIG;
1887 vmf.vmf_ecx = sizeof(struct bios_smap);
1888 i = vm86_datacall(0x15, &vmf, &vmc);
1889 if (i || vmf.vmf_eax != SMAP_SIG)
1892 if (!add_smap_entry(smap, physmap, &physmap_idx))
1894 } while (vmf.vmf_ebx != 0);
1898 * If we didn't fetch the "base memory" size from INT12,
1899 * figure it out from the SMAP (or just guess).
1902 for (i = 0; i <= physmap_idx; i += 2) {
1903 if (physmap[i] == 0x00000000) {
1904 basemem = physmap[i + 1] / 1024;
1909 /* XXX: If we couldn't find basemem from SMAP, just guess. */
1915 if (physmap[1] != 0)
1919 * If we failed to find an SMAP, figure out the extended
1920 * memory size. We will then build a simple memory map with
1921 * two segments, one for "base memory" and the second for
1922 * "extended memory". Note that "extended memory" starts at a
1923 * physical address of 1MB and that both basemem and extmem
1924 * are in units of 1KB.
1926 * First, try to fetch the extended memory size via INT 15:E801.
1928 vmf.vmf_ax = 0xE801;
1929 if (vm86_intcall(0x15, &vmf) == 0) {
1930 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1933 * If INT15:E801 fails, this is our last ditch effort
1934 * to determine the extended memory size. Currently
1935 * we prefer the RTC value over INT15:88.
1939 vm86_intcall(0x15, &vmf);
1940 extmem = vmf.vmf_ax;
1942 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1947 * Special hack for chipsets that still remap the 384k hole when
1948 * there's 16MB of memory - this really confuses people that
1949 * are trying to use bus mastering ISA controllers with the
1950 * "16MB limit"; they only have 16MB, but the remapping puts
1951 * them beyond the limit.
1953 * If extended memory is between 15-16MB (16-17MB phys address range),
1956 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1960 physmap[1] = basemem * 1024;
1962 physmap[physmap_idx] = 0x100000;
1963 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1967 * Now, physmap contains a map of physical memory.
1971 /* make hole for AP bootstrap code */
1972 alloc_ap_trampoline(physmap, &physmap_idx);
1976 * Maxmem isn't the "maximum memory", it's one larger than the
1977 * highest page of the physical address space. It should be
1978 * called something like "Maxphyspage". We may adjust this
1979 * based on ``hw.physmem'' and the results of the memory test.
1981 * This is especially confusing when it is much larger than the
1982 * memory size and is displayed as "realmem".
1984 Maxmem = atop(physmap[physmap_idx + 1]);
1987 Maxmem = MAXMEM / 4;
1990 if (TUNABLE_QUAD_FETCH("hw.physmem", &physmem_tunable))
1991 Maxmem = atop(physmem_tunable);
1994 * If we have an SMAP, don't allow MAXMEM or hw.physmem to extend
1995 * the amount of memory in the system.
1997 if (has_smap && Maxmem > atop(physmap[physmap_idx + 1]))
1998 Maxmem = atop(physmap[physmap_idx + 1]);
2001 * By default enable the memory test on real hardware, and disable
2002 * it if we appear to be running in a VM. This avoids touching all
2003 * pages unnecessarily, which doesn't matter on real hardware but is
2004 * bad for shared VM hosts. Use a general name so that
2005 * one could eventually do more with the code than just disable it.
2007 memtest = (vm_guest > VM_GUEST_NO) ? 0 : 1;
2008 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
2010 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
2011 (boothowto & RB_VERBOSE))
2012 printf("Physical memory use set to %ldK\n", Maxmem * 4);
2015 * If Maxmem has been increased beyond what the system has detected,
2016 * extend the last memory segment to the new limit.
2018 if (atop(physmap[physmap_idx + 1]) < Maxmem)
2019 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem);
2021 /* call pmap initialization to make new kernel address space */
2022 pmap_bootstrap(first);
2025 * Size up each available chunk of physical memory.
2027 physmap[0] = PAGE_SIZE; /* mask off page 0 */
2030 phys_avail[pa_indx++] = physmap[0];
2031 phys_avail[pa_indx] = physmap[0];
2032 dump_avail[da_indx] = physmap[0];
2036 * Get dcons buffer address
2038 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
2039 getenv_quad("dcons.size", &dcons_size) == 0)
2043 * physmap is in bytes, so when converting to page boundaries,
2044 * round up the start address and round down the end address.
2046 for (i = 0; i <= physmap_idx; i += 2) {
2049 end = ptoa((vm_paddr_t)Maxmem);
2050 if (physmap[i + 1] < end)
2051 end = trunc_page(physmap[i + 1]);
2052 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
2053 int tmp, page_bad, full;
2054 int *ptr = (int *)CADDR3;
2058 * block out kernel memory as not available.
2060 if (pa >= KERNLOAD && pa < first)
2064 * block out dcons buffer
2067 && pa >= trunc_page(dcons_addr)
2068 && pa < dcons_addr + dcons_size)
2076 * map page into kernel: valid, read/write,non-cacheable
2078 *pte = pa | PG_V | PG_RW | PG_N;
2083 * Test for alternating 1's and 0's
2085 *(volatile int *)ptr = 0xaaaaaaaa;
2086 if (*(volatile int *)ptr != 0xaaaaaaaa)
2089 * Test for alternating 0's and 1's
2091 *(volatile int *)ptr = 0x55555555;
2092 if (*(volatile int *)ptr != 0x55555555)
2097 *(volatile int *)ptr = 0xffffffff;
2098 if (*(volatile int *)ptr != 0xffffffff)
2103 *(volatile int *)ptr = 0x0;
2104 if (*(volatile int *)ptr != 0x0)
2107 * Restore original value.
2113 * Adjust array of valid/good pages.
2115 if (page_bad == TRUE)
2118 * If this good page is a continuation of the
2119 * previous set of good pages, then just increase
2120 * the end pointer. Otherwise start a new chunk.
2121 * Note that "end" points one higher than end,
2122 * making the range >= start and < end.
2123 * If we're also doing a speculative memory
2124 * test and we at or past the end, bump up Maxmem
2125 * so that we keep going. The first bad page
2126 * will terminate the loop.
2128 if (phys_avail[pa_indx] == pa) {
2129 phys_avail[pa_indx] += PAGE_SIZE;
2132 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
2134 "Too many holes in the physical address space, giving up\n");
2139 phys_avail[pa_indx++] = pa; /* start */
2140 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
2144 if (dump_avail[da_indx] == pa) {
2145 dump_avail[da_indx] += PAGE_SIZE;
2148 if (da_indx == DUMP_AVAIL_ARRAY_END) {
2152 dump_avail[da_indx++] = pa; /* start */
2153 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
2165 * The last chunk must contain at least one page plus the message
2166 * buffer to avoid complicating other code (message buffer address
2167 * calculation, etc.).
2169 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
2170 round_page(msgbufsize) >= phys_avail[pa_indx]) {
2171 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
2172 phys_avail[pa_indx--] = 0;
2173 phys_avail[pa_indx--] = 0;
2176 Maxmem = atop(phys_avail[pa_indx]);
2178 /* Trim off space for the message buffer. */
2179 phys_avail[pa_indx] -= round_page(msgbufsize);
2181 /* Map the message buffer. */
2182 for (off = 0; off < round_page(msgbufsize); off += PAGE_SIZE)
2183 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
2191 db_fetch_ksymtab(bootinfo.bi_symtab, bootinfo.bi_esymtab);
2195 if (boothowto & RB_KDB)
2196 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
2203 struct gate_descriptor *ip;
2207 for (x = 0; x < NIDT; x++) {
2209 if (ip->gd_type != SDT_SYS386IGT &&
2210 ip->gd_type != SDT_SYS386TGT)
2212 off = ip->gd_looffset + (((u_int)ip->gd_hioffset) << 16);
2213 KASSERT(off >= (uintptr_t)start_exceptions &&
2214 off < (uintptr_t)end_exceptions,
2215 ("IDT[%d] type %d off %#x", x, ip->gd_type, off));
2217 MPASS(off >= PMAP_TRM_MIN_ADDRESS &&
2218 off < PMAP_TRM_MAX_ADDRESS);
2219 ip->gd_looffset = off;
2220 ip->gd_hioffset = off >> 16;
2230 for (x = 0; x < NIDT; x++)
2231 setidt(x, &IDTVEC(rsvd), SDT_SYS386IGT, SEL_KPL,
2232 GSEL(GCODE_SEL, SEL_KPL));
2233 setidt(IDT_DE, &IDTVEC(div), SDT_SYS386IGT, SEL_KPL,
2234 GSEL(GCODE_SEL, SEL_KPL));
2235 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL,
2236 GSEL(GCODE_SEL, SEL_KPL));
2237 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYS386IGT, SEL_KPL,
2238 GSEL(GCODE_SEL, SEL_KPL));
2239 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL,
2240 GSEL(GCODE_SEL, SEL_KPL));
2241 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYS386IGT, SEL_UPL,
2242 GSEL(GCODE_SEL, SEL_KPL));
2243 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYS386IGT, SEL_KPL,
2244 GSEL(GCODE_SEL, SEL_KPL));
2245 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL,
2246 GSEL(GCODE_SEL, SEL_KPL));
2247 setidt(IDT_NM, &IDTVEC(dna), SDT_SYS386IGT, SEL_KPL,
2248 GSEL(GCODE_SEL, SEL_KPL));
2249 setidt(IDT_DF, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL,
2251 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYS386IGT,
2252 SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2253 setidt(IDT_TS, &IDTVEC(tss), SDT_SYS386IGT, SEL_KPL,
2254 GSEL(GCODE_SEL, SEL_KPL));
2255 setidt(IDT_NP, &IDTVEC(missing), SDT_SYS386IGT, SEL_KPL,
2256 GSEL(GCODE_SEL, SEL_KPL));
2257 setidt(IDT_SS, &IDTVEC(stk), SDT_SYS386IGT, SEL_KPL,
2258 GSEL(GCODE_SEL, SEL_KPL));
2259 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL,
2260 GSEL(GCODE_SEL, SEL_KPL));
2261 setidt(IDT_PF, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL,
2262 GSEL(GCODE_SEL, SEL_KPL));
2263 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYS386IGT, SEL_KPL,
2264 GSEL(GCODE_SEL, SEL_KPL));
2265 setidt(IDT_AC, &IDTVEC(align), SDT_SYS386IGT, SEL_KPL,
2266 GSEL(GCODE_SEL, SEL_KPL));
2267 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYS386IGT, SEL_KPL,
2268 GSEL(GCODE_SEL, SEL_KPL));
2269 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYS386IGT, SEL_KPL,
2270 GSEL(GCODE_SEL, SEL_KPL));
2271 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall),
2272 SDT_SYS386IGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2273 #ifdef KDTRACE_HOOKS
2274 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret),
2275 SDT_SYS386IGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2278 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall),
2279 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2287 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL,
2288 GSEL(GCODE_SEL, SEL_KPL));
2289 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL,
2290 GSEL(GCODE_SEL, SEL_KPL));
2293 #if defined(DEV_ISA) && !defined(DEV_ATPIC)
2298 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint),
2299 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2300 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint),
2301 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2308 struct region_descriptor r_gdt, r_idt; /* table descriptors */
2309 int gsel_tss, metadata_missing, x, pa;
2311 struct xstate_hdr *xhdr;
2316 thread0.td_kstack = proc0kstack;
2317 thread0.td_kstack_pages = TD0_KSTACK_PAGES;
2320 * This may be done better later if it gets more high level
2321 * components in it. If so just link td->td_proc here.
2323 proc_linkup0(&proc0, &thread0);
2325 if (bootinfo.bi_modulep) {
2326 metadata_missing = 0;
2327 addend = (vm_paddr_t)bootinfo.bi_modulep < KERNBASE ?
2329 preload_metadata = (caddr_t)bootinfo.bi_modulep + addend;
2330 preload_bootstrap_relocate(addend);
2332 metadata_missing = 1;
2335 if (bootinfo.bi_envp != 0) {
2336 addend = (vm_paddr_t)bootinfo.bi_envp < KERNBASE ?
2338 init_static_kenv((char *)bootinfo.bi_envp + addend, 0);
2340 init_static_kenv(NULL, 0);
2343 identify_hypervisor();
2345 /* Init basic tunables, hz etc */
2349 * Make gdt memory segments. All segments cover the full 4GB
2350 * of address space and permissions are enforced at page level.
2352 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
2353 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
2354 gdt_segs[GUCODE_SEL].ssd_limit = atop(0 - 1);
2355 gdt_segs[GUDATA_SEL].ssd_limit = atop(0 - 1);
2356 gdt_segs[GUFS_SEL].ssd_limit = atop(0 - 1);
2357 gdt_segs[GUGS_SEL].ssd_limit = atop(0 - 1);
2360 gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1);
2361 gdt_segs[GPRIV_SEL].ssd_base = (int)pc;
2362 gdt_segs[GPROC0_SEL].ssd_base = (int)&common_tss0;
2364 for (x = 0; x < NGDT; x++)
2365 ssdtosd(&gdt_segs[x], &gdt0[x].sd);
2367 r_gdt.rd_limit = NGDT * sizeof(gdt0[0]) - 1;
2368 r_gdt.rd_base = (int)gdt0;
2369 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_SPIN);
2372 pcpu_init(pc, 0, sizeof(struct pcpu));
2373 for (pa = first; pa < first + DPCPU_SIZE; pa += PAGE_SIZE)
2374 pmap_kenter(pa, pa);
2375 dpcpu_init((void *)first, 0);
2376 first += DPCPU_SIZE;
2377 PCPU_SET(prvspace, pc);
2378 PCPU_SET(curthread, &thread0);
2379 /* Non-late cninit() and printf() can be moved up to here. */
2382 * Initialize mutexes.
2384 * icu_lock: in order to allow an interrupt to occur in a critical
2385 * section, to set pcpu->ipending (etc...) properly, we
2386 * must be able to get the icu lock, so it can't be
2390 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS | MTX_NOPROFILE);
2394 r_idt.rd_limit = sizeof(idt0) - 1;
2395 r_idt.rd_base = (int) idt;
2399 * Initialize the clock before the console so that console
2400 * initialization can use DELAY().
2404 finishidentcpu(); /* Final stage of CPU initialization */
2406 initializecpu(); /* Initialize CPU registers */
2407 initializecpucache();
2409 /* pointer to selector slot for %fs/%gs */
2410 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd);
2412 /* Initialize the tss (except for the final esp0) early for vm86. */
2413 common_tss0.tss_esp0 = thread0.td_kstack + thread0.td_kstack_pages *
2414 PAGE_SIZE - VM86_STACK_SPACE;
2415 common_tss0.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
2416 common_tss0.tss_ioopt = sizeof(struct i386tss) << 16;
2417 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2418 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd);
2419 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
2422 /* Initialize the PIC early for vm86 calls. */
2428 /* Reset and mask the atpics and leave them shut down. */
2432 * Point the ICU spurious interrupt vectors at the APIC spurious
2433 * interrupt handler.
2440 * The console and kdb should be initialized even earlier than here,
2441 * but some console drivers don't work until after getmemsize().
2442 * Default to late console initialization to support these drivers.
2443 * This loses mainly printf()s in getmemsize() and early debugging.
2446 TUNABLE_INT_FETCH("debug.late_console", &late_console);
2447 if (!late_console) {
2452 kmdp = preload_search_by_type("elf kernel");
2453 link_elf_ireloc(kmdp);
2457 init_param2(physmem);
2459 /* now running on new page tables, configured,and u/iom is accessible */
2464 if (metadata_missing)
2465 printf("WARNING: loader(8) metadata is missing!\n");
2470 msgbufinit(msgbufp, msgbufsize);
2473 * Set up thread0 pcb after npxinit calculated pcb + fpu save
2474 * area size. Zero out the extended state header in fpu save
2477 thread0.td_pcb = get_pcb_td(&thread0);
2478 thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
2479 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
2481 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
2483 xhdr->xstate_bv = xsave_mask;
2485 PCPU_SET(curpcb, thread0.td_pcb);
2486 /* Move esp0 in the tss to its final place. */
2487 /* Note: -16 is so we can grow the trapframe if we came from vm86 */
2488 common_tss0.tss_esp0 = (vm_offset_t)thread0.td_pcb - VM86_STACK_SPACE;
2489 PCPU_SET(kesp0, common_tss0.tss_esp0);
2490 gdt[GPROC0_SEL].sd.sd_type = SDT_SYS386TSS; /* clear busy bit */
2493 /* transfer to user mode */
2495 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
2496 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
2498 /* setup proc 0's pcb */
2499 thread0.td_pcb->pcb_flags = 0;
2500 #if defined(PAE) || defined(PAE_TABLES)
2501 thread0.td_pcb->pcb_cr3 = (int)IdlePDPT;
2503 thread0.td_pcb->pcb_cr3 = (int)IdlePTD;
2505 thread0.td_pcb->pcb_ext = 0;
2506 thread0.td_frame = &proc0_tf;
2514 /* Location of kernel stack for locore */
2515 return ((register_t)thread0.td_pcb);
2519 machdep_init_trampoline(void)
2521 struct region_descriptor r_gdt, r_idt;
2522 struct i386tss *tss;
2523 char *copyout_buf, *trampoline, *tramp_stack_base;
2526 gdt = pmap_trm_alloc(sizeof(union descriptor) * NGDT * mp_ncpus,
2528 bcopy(gdt0, gdt, sizeof(union descriptor) * NGDT);
2529 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
2530 r_gdt.rd_base = (int)gdt;
2533 tss = pmap_trm_alloc(sizeof(struct i386tss) * mp_ncpus,
2535 bcopy(&common_tss0, tss, sizeof(struct i386tss));
2536 gdt[GPROC0_SEL].sd.sd_lobase = (int)tss;
2537 gdt[GPROC0_SEL].sd.sd_hibase = (u_int)tss >> 24;
2538 gdt[GPROC0_SEL].sd.sd_type = SDT_SYS386TSS;
2540 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd);
2541 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd);
2542 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
2543 PCPU_SET(common_tssp, tss);
2544 ltr(GSEL(GPROC0_SEL, SEL_KPL));
2546 trampoline = pmap_trm_alloc(end_exceptions - start_exceptions,
2548 bcopy(start_exceptions, trampoline, end_exceptions - start_exceptions);
2549 tramp_stack_base = pmap_trm_alloc(TRAMP_STACK_SZ, M_NOWAIT);
2550 PCPU_SET(trampstk, (uintptr_t)tramp_stack_base + TRAMP_STACK_SZ -
2552 tss[0].tss_esp0 = PCPU_GET(trampstk);
2554 idt = pmap_trm_alloc(sizeof(idt0), M_NOWAIT | M_ZERO);
2555 bcopy(idt0, idt, sizeof(idt0));
2557 /* Re-initialize new IDT since the handlers were relocated */
2558 setidt_disp = trampoline - start_exceptions;
2561 r_idt.rd_limit = sizeof(struct gate_descriptor) * NIDT - 1;
2562 r_idt.rd_base = (int)idt;
2566 dblfault_tss = pmap_trm_alloc(sizeof(struct i386tss), M_NOWAIT | M_ZERO);
2567 dblfault_stack = pmap_trm_alloc(PAGE_SIZE, M_NOWAIT);
2568 dblfault_tss->tss_esp = dblfault_tss->tss_esp0 =
2569 dblfault_tss->tss_esp1 = dblfault_tss->tss_esp2 =
2570 (int)dblfault_stack + PAGE_SIZE;
2571 dblfault_tss->tss_ss = dblfault_tss->tss_ss0 = dblfault_tss->tss_ss1 =
2572 dblfault_tss->tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2573 #if defined(PAE) || defined(PAE_TABLES)
2574 dblfault_tss->tss_cr3 = (int)IdlePDPT;
2576 dblfault_tss->tss_cr3 = (int)IdlePTD;
2578 dblfault_tss->tss_eip = (int)dblfault_handler;
2579 dblfault_tss->tss_eflags = PSL_KERNEL;
2580 dblfault_tss->tss_ds = dblfault_tss->tss_es =
2581 dblfault_tss->tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2582 dblfault_tss->tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2583 dblfault_tss->tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2584 dblfault_tss->tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2585 gdt[GPANIC_SEL].sd.sd_lobase = (int)dblfault_tss;
2586 gdt[GPANIC_SEL].sd.sd_hibase = (u_int)dblfault_tss >> 24;
2588 /* make ldt memory segments */
2589 ldt = pmap_trm_alloc(sizeof(union descriptor) * NLDT,
2591 gdt[GLDT_SEL].sd.sd_lobase = (int)ldt;
2592 gdt[GLDT_SEL].sd.sd_hibase = (u_int)ldt >> 24;
2593 ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1);
2594 ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1);
2595 for (x = 0; x < nitems(ldt_segs); x++)
2596 ssdtosd(&ldt_segs[x], &ldt[x].sd);
2598 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
2600 PCPU_SET(currentldt, _default_ldt);
2602 copyout_buf = pmap_trm_alloc(TRAMP_COPYOUT_SZ, M_NOWAIT);
2603 PCPU_SET(copyout_buf, copyout_buf);
2604 copyout_init_tramp();
2606 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_SECOND, machdep_init_trampoline, NULL);
2610 i386_setup_lcall_gate(void)
2612 struct sysentvec *sv;
2613 struct user_segment_descriptor desc;
2616 sv = &elf32_freebsd_sysvec;
2617 lcall_addr = (uintptr_t)sv->sv_psstrings - sz_lcall_tramp;
2619 bzero(&desc, sizeof(desc));
2620 desc.sd_type = SDT_MEMERA;
2621 desc.sd_dpl = SEL_UPL;
2625 desc.sd_lolimit = 0xffff;
2626 desc.sd_hilimit = 0xf;
2627 desc.sd_lobase = lcall_addr;
2628 desc.sd_hibase = lcall_addr >> 24;
2629 bcopy(&desc, &ldt[LSYS5CALLS_SEL], sizeof(desc));
2631 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, i386_setup_lcall_gate, NULL);
2635 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
2638 pcpu->pc_acpi_id = 0xffffffff;
2642 smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
2644 struct bios_smap *smapbase;
2645 struct bios_smap_xattr smap;
2648 int count, error, i;
2650 /* Retrieve the system memory map from the loader. */
2651 kmdp = preload_search_by_type("elf kernel");
2653 kmdp = preload_search_by_type("elf32 kernel");
2654 smapbase = (struct bios_smap *)preload_search_info(kmdp,
2655 MODINFO_METADATA | MODINFOMD_SMAP);
2656 if (smapbase == NULL)
2658 smapattr = (uint32_t *)preload_search_info(kmdp,
2659 MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
2660 count = *((u_int32_t *)smapbase - 1) / sizeof(*smapbase);
2662 for (i = 0; i < count; i++) {
2663 smap.base = smapbase[i].base;
2664 smap.length = smapbase[i].length;
2665 smap.type = smapbase[i].type;
2666 if (smapattr != NULL)
2667 smap.xattr = smapattr[i];
2670 error = SYSCTL_OUT(req, &smap, sizeof(smap));
2674 SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
2675 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
2678 spinlock_enter(void)
2684 if (td->td_md.md_spinlock_count == 0) {
2685 flags = intr_disable();
2686 td->td_md.md_spinlock_count = 1;
2687 td->td_md.md_saved_flags = flags;
2689 td->td_md.md_spinlock_count++;
2701 flags = td->td_md.md_saved_flags;
2702 td->td_md.md_spinlock_count--;
2703 if (td->td_md.md_spinlock_count == 0)
2704 intr_restore(flags);
2707 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2708 static void f00f_hack(void *unused);
2709 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2712 f00f_hack(void *unused)
2714 struct region_descriptor r_idt;
2715 struct gate_descriptor *new_idt;
2723 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2725 tmp = (vm_offset_t)pmap_trm_alloc(PAGE_SIZE * 3, M_NOWAIT | M_ZERO);
2727 panic("kmem_malloc returned 0");
2728 tmp = round_page(tmp);
2730 /* Put the problematic entry (#6) at the end of the lower page. */
2731 new_idt = (struct gate_descriptor *)
2732 (tmp + PAGE_SIZE - 7 * sizeof(struct gate_descriptor));
2733 bcopy(idt, new_idt, sizeof(idt0));
2734 r_idt.rd_base = (u_int)new_idt;
2735 r_idt.rd_limit = sizeof(idt0) - 1;
2737 /* SMP machines do not need the F00F hack. */
2739 pmap_protect(kernel_pmap, tmp, tmp + PAGE_SIZE, VM_PROT_READ);
2741 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2744 * Construct a PCB from a trapframe. This is called from kdb_trap() where
2745 * we want to start a backtrace from the function that caused us to enter
2746 * the debugger. We have the context in the trapframe, but base the trace
2747 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
2748 * enough for a backtrace.
2751 makectx(struct trapframe *tf, struct pcb *pcb)
2754 pcb->pcb_edi = tf->tf_edi;
2755 pcb->pcb_esi = tf->tf_esi;
2756 pcb->pcb_ebp = tf->tf_ebp;
2757 pcb->pcb_ebx = tf->tf_ebx;
2758 pcb->pcb_eip = tf->tf_eip;
2759 pcb->pcb_esp = (ISPL(tf->tf_cs)) ? tf->tf_esp : (int)(tf + 1) - 8;
2760 pcb->pcb_gs = rgs();
2764 ptrace_set_pc(struct thread *td, u_long addr)
2767 td->td_frame->tf_eip = addr;
2772 ptrace_single_step(struct thread *td)
2775 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
2776 if ((td->td_frame->tf_eflags & PSL_T) == 0) {
2777 td->td_frame->tf_eflags |= PSL_T;
2778 td->td_dbgflags |= TDB_STEP;
2784 ptrace_clear_single_step(struct thread *td)
2787 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
2788 td->td_frame->tf_eflags &= ~PSL_T;
2789 td->td_dbgflags &= ~TDB_STEP;
2794 fill_regs(struct thread *td, struct reg *regs)
2797 struct trapframe *tp;
2801 regs->r_gs = pcb->pcb_gs;
2802 return (fill_frame_regs(tp, regs));
2806 fill_frame_regs(struct trapframe *tp, struct reg *regs)
2808 regs->r_fs = tp->tf_fs;
2809 regs->r_es = tp->tf_es;
2810 regs->r_ds = tp->tf_ds;
2811 regs->r_edi = tp->tf_edi;
2812 regs->r_esi = tp->tf_esi;
2813 regs->r_ebp = tp->tf_ebp;
2814 regs->r_ebx = tp->tf_ebx;
2815 regs->r_edx = tp->tf_edx;
2816 regs->r_ecx = tp->tf_ecx;
2817 regs->r_eax = tp->tf_eax;
2818 regs->r_eip = tp->tf_eip;
2819 regs->r_cs = tp->tf_cs;
2820 regs->r_eflags = tp->tf_eflags;
2821 regs->r_esp = tp->tf_esp;
2822 regs->r_ss = tp->tf_ss;
2827 set_regs(struct thread *td, struct reg *regs)
2830 struct trapframe *tp;
2833 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2834 !CS_SECURE(regs->r_cs))
2837 tp->tf_fs = regs->r_fs;
2838 tp->tf_es = regs->r_es;
2839 tp->tf_ds = regs->r_ds;
2840 tp->tf_edi = regs->r_edi;
2841 tp->tf_esi = regs->r_esi;
2842 tp->tf_ebp = regs->r_ebp;
2843 tp->tf_ebx = regs->r_ebx;
2844 tp->tf_edx = regs->r_edx;
2845 tp->tf_ecx = regs->r_ecx;
2846 tp->tf_eax = regs->r_eax;
2847 tp->tf_eip = regs->r_eip;
2848 tp->tf_cs = regs->r_cs;
2849 tp->tf_eflags = regs->r_eflags;
2850 tp->tf_esp = regs->r_esp;
2851 tp->tf_ss = regs->r_ss;
2852 pcb->pcb_gs = regs->r_gs;
2857 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2860 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2861 P_SHOULDSTOP(td->td_proc),
2862 ("not suspended thread %p", td));
2865 npx_fill_fpregs_xmm(&get_pcb_user_save_td(td)->sv_xmm,
2866 (struct save87 *)fpregs);
2868 bcopy(&get_pcb_user_save_td(td)->sv_87, fpregs,
2874 set_fpregs(struct thread *td, struct fpreg *fpregs)
2879 npx_set_fpregs_xmm((struct save87 *)fpregs,
2880 &get_pcb_user_save_td(td)->sv_xmm);
2882 bcopy(fpregs, &get_pcb_user_save_td(td)->sv_87,
2890 * Get machine context.
2893 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2895 struct trapframe *tp;
2896 struct segment_descriptor *sdp;
2900 PROC_LOCK(curthread->td_proc);
2901 mcp->mc_onstack = sigonstack(tp->tf_esp);
2902 PROC_UNLOCK(curthread->td_proc);
2903 mcp->mc_gs = td->td_pcb->pcb_gs;
2904 mcp->mc_fs = tp->tf_fs;
2905 mcp->mc_es = tp->tf_es;
2906 mcp->mc_ds = tp->tf_ds;
2907 mcp->mc_edi = tp->tf_edi;
2908 mcp->mc_esi = tp->tf_esi;
2909 mcp->mc_ebp = tp->tf_ebp;
2910 mcp->mc_isp = tp->tf_isp;
2911 mcp->mc_eflags = tp->tf_eflags;
2912 if (flags & GET_MC_CLEAR_RET) {
2915 mcp->mc_eflags &= ~PSL_C;
2917 mcp->mc_eax = tp->tf_eax;
2918 mcp->mc_edx = tp->tf_edx;
2920 mcp->mc_ebx = tp->tf_ebx;
2921 mcp->mc_ecx = tp->tf_ecx;
2922 mcp->mc_eip = tp->tf_eip;
2923 mcp->mc_cs = tp->tf_cs;
2924 mcp->mc_esp = tp->tf_esp;
2925 mcp->mc_ss = tp->tf_ss;
2926 mcp->mc_len = sizeof(*mcp);
2927 get_fpcontext(td, mcp, NULL, 0);
2928 sdp = &td->td_pcb->pcb_fsd;
2929 mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
2930 sdp = &td->td_pcb->pcb_gsd;
2931 mcp->mc_gsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
2933 mcp->mc_xfpustate = 0;
2934 mcp->mc_xfpustate_len = 0;
2935 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
2940 * Set machine context.
2942 * However, we don't set any but the user modifiable flags, and we won't
2943 * touch the cs selector.
2946 set_mcontext(struct thread *td, mcontext_t *mcp)
2948 struct trapframe *tp;
2953 if (mcp->mc_len != sizeof(*mcp) ||
2954 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2956 eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
2957 (tp->tf_eflags & ~PSL_USERCHANGE);
2958 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2959 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2960 sizeof(union savefpu))
2962 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2963 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2964 mcp->mc_xfpustate_len);
2969 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2972 tp->tf_fs = mcp->mc_fs;
2973 tp->tf_es = mcp->mc_es;
2974 tp->tf_ds = mcp->mc_ds;
2975 tp->tf_edi = mcp->mc_edi;
2976 tp->tf_esi = mcp->mc_esi;
2977 tp->tf_ebp = mcp->mc_ebp;
2978 tp->tf_ebx = mcp->mc_ebx;
2979 tp->tf_edx = mcp->mc_edx;
2980 tp->tf_ecx = mcp->mc_ecx;
2981 tp->tf_eax = mcp->mc_eax;
2982 tp->tf_eip = mcp->mc_eip;
2983 tp->tf_eflags = eflags;
2984 tp->tf_esp = mcp->mc_esp;
2985 tp->tf_ss = mcp->mc_ss;
2986 td->td_pcb->pcb_gs = mcp->mc_gs;
2991 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2992 size_t xfpusave_len)
2994 size_t max_len, len;
2996 mcp->mc_ownedfp = npxgetregs(td);
2997 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
2998 sizeof(mcp->mc_fpstate));
2999 mcp->mc_fpformat = npxformat();
3000 if (!use_xsave || xfpusave_len == 0)
3002 max_len = cpu_max_ext_state_size - sizeof(union savefpu);
3004 if (len > max_len) {
3006 bzero(xfpusave + max_len, len - max_len);
3008 mcp->mc_flags |= _MC_HASFPXSTATE;
3009 mcp->mc_xfpustate_len = len;
3010 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
3014 set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate,
3015 size_t xfpustate_len)
3019 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
3021 else if (mcp->mc_fpformat != _MC_FPFMT_387 &&
3022 mcp->mc_fpformat != _MC_FPFMT_XMM)
3024 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
3025 /* We don't care what state is left in the FPU or PCB. */
3028 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
3029 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
3030 error = npxsetregs(td, (union savefpu *)&mcp->mc_fpstate,
3031 xfpustate, xfpustate_len);
3038 fpstate_drop(struct thread *td)
3041 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
3043 if (PCPU_GET(fpcurthread) == td)
3046 * XXX force a full drop of the npx. The above only drops it if we
3047 * owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
3049 * XXX I don't much like npxgetregs()'s semantics of doing a full
3050 * drop. Dropping only to the pcb matches fnsave's behaviour.
3051 * We only need to drop to !PCB_INITDONE in sendsig(). But
3052 * sendsig() is the only caller of npxgetregs()... perhaps we just
3053 * have too many layers.
3055 curthread->td_pcb->pcb_flags &= ~(PCB_NPXINITDONE |
3056 PCB_NPXUSERINITDONE);
3061 fill_dbregs(struct thread *td, struct dbreg *dbregs)
3066 dbregs->dr[0] = rdr0();
3067 dbregs->dr[1] = rdr1();
3068 dbregs->dr[2] = rdr2();
3069 dbregs->dr[3] = rdr3();
3070 dbregs->dr[6] = rdr6();
3071 dbregs->dr[7] = rdr7();
3074 dbregs->dr[0] = pcb->pcb_dr0;
3075 dbregs->dr[1] = pcb->pcb_dr1;
3076 dbregs->dr[2] = pcb->pcb_dr2;
3077 dbregs->dr[3] = pcb->pcb_dr3;
3078 dbregs->dr[6] = pcb->pcb_dr6;
3079 dbregs->dr[7] = pcb->pcb_dr7;
3087 set_dbregs(struct thread *td, struct dbreg *dbregs)
3093 load_dr0(dbregs->dr[0]);
3094 load_dr1(dbregs->dr[1]);
3095 load_dr2(dbregs->dr[2]);
3096 load_dr3(dbregs->dr[3]);
3097 load_dr6(dbregs->dr[6]);
3098 load_dr7(dbregs->dr[7]);
3101 * Don't let an illegal value for dr7 get set. Specifically,
3102 * check for undefined settings. Setting these bit patterns
3103 * result in undefined behaviour and can lead to an unexpected
3106 for (i = 0; i < 4; i++) {
3107 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
3109 if (DBREG_DR7_LEN(dbregs->dr[7], i) == 0x02)
3116 * Don't let a process set a breakpoint that is not within the
3117 * process's address space. If a process could do this, it
3118 * could halt the system by setting a breakpoint in the kernel
3119 * (if ddb was enabled). Thus, we need to check to make sure
3120 * that no breakpoints are being enabled for addresses outside
3121 * process's address space.
3123 * XXX - what about when the watched area of the user's
3124 * address space is written into from within the kernel
3125 * ... wouldn't that still cause a breakpoint to be generated
3126 * from within kernel mode?
3129 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
3130 /* dr0 is enabled */
3131 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
3135 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
3136 /* dr1 is enabled */
3137 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
3141 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
3142 /* dr2 is enabled */
3143 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
3147 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
3148 /* dr3 is enabled */
3149 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
3153 pcb->pcb_dr0 = dbregs->dr[0];
3154 pcb->pcb_dr1 = dbregs->dr[1];
3155 pcb->pcb_dr2 = dbregs->dr[2];
3156 pcb->pcb_dr3 = dbregs->dr[3];
3157 pcb->pcb_dr6 = dbregs->dr[6];
3158 pcb->pcb_dr7 = dbregs->dr[7];
3160 pcb->pcb_flags |= PCB_DBREGS;
3167 * Return > 0 if a hardware breakpoint has been hit, and the
3168 * breakpoint was in user space. Return 0, otherwise.
3171 user_dbreg_trap(register_t dr6)
3174 u_int32_t bp; /* breakpoint bits extracted from dr6 */
3175 int nbp; /* number of breakpoints that triggered */
3176 caddr_t addr[4]; /* breakpoint addresses */
3179 bp = dr6 & DBREG_DR6_BMASK;
3182 * None of the breakpoint bits are set meaning this
3183 * trap was not caused by any of the debug registers
3189 if ((dr7 & 0x000000ff) == 0) {
3191 * all GE and LE bits in the dr7 register are zero,
3192 * thus the trap couldn't have been caused by the
3193 * hardware debug registers
3201 * at least one of the breakpoints were hit, check to see
3202 * which ones and if any of them are user space addresses
3206 addr[nbp++] = (caddr_t)rdr0();
3209 addr[nbp++] = (caddr_t)rdr1();
3212 addr[nbp++] = (caddr_t)rdr2();
3215 addr[nbp++] = (caddr_t)rdr3();
3218 for (i = 0; i < nbp; i++) {
3219 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
3221 * addr[i] is in user space
3228 * None of the breakpoints are in user space.
3236 * Provide inb() and outb() as functions. They are normally only available as
3237 * inline functions, thus cannot be called from the debugger.
3240 /* silence compiler warnings */
3241 u_char inb_(u_short);
3242 void outb_(u_short, u_char);
3251 outb_(u_short port, u_char data)