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 <x86/ucode.h>
137 #include <machine/vm86.h>
138 #include <x86/init.h>
140 #include <machine/perfmon.h>
143 #include <machine/smp.h>
150 #include <x86/apicvar.h>
154 #include <x86/isa/icu.h>
157 /* Sanity check for __curthread() */
158 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
160 register_t init386(int first);
161 void dblfault_handler(void);
162 void identify_cpu(void);
164 static void cpu_startup(void *);
165 static void fpstate_drop(struct thread *td);
166 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
167 char *xfpusave, size_t xfpusave_len);
168 static int set_fpcontext(struct thread *td, mcontext_t *mcp,
169 char *xfpustate, size_t xfpustate_len);
170 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
172 /* Intel ICH registers */
173 #define ICH_PMBASE 0x400
174 #define ICH_SMI_EN ICH_PMBASE + 0x30
176 int _udatasel, _ucodesel;
178 static int above4g_allow = 1;
179 static int above24g_allow = 0;
184 static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
186 #ifdef COMPAT_FREEBSD4
187 static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
194 FEATURE(pae, "Physical Address Extensions");
198 * The number of PHYSMAP entries must be one less than the number of
199 * PHYSSEG entries because the PHYSMAP entry that spans the largest
200 * physical address that is accessible by ISA DMA is split into two
203 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
205 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
206 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
208 /* must be 2 less so 0 0 can signal end of chunks */
209 #define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
210 #define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
212 struct kva_md_info kmi;
214 static struct trapframe proc0_tf;
215 struct pcpu __pcpu[MAXCPU];
219 struct mem_range_softc mem_range_softc;
221 extern char start_exceptions[], end_exceptions[];
223 extern struct sysentvec elf32_freebsd_sysvec;
225 /* Default init_ops implementation. */
226 struct init_ops init_ops = {
227 .early_clock_source_init = i8254_init,
228 .early_delay = i8254_delay,
230 .msi_init = msi_init,
242 * On MacBooks, we need to disallow the legacy USB circuit to
243 * generate an SMI# because this can cause several problems,
244 * namely: incorrect CPU frequency detection and failure to
246 * We do this by disabling a bit in the SMI_EN (SMI Control and
247 * Enable register) of the Intel ICH LPC Interface Bridge.
249 sysenv = kern_getenv("smbios.system.product");
250 if (sysenv != NULL) {
251 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
252 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
253 strncmp(sysenv, "MacBook4,1", 10) == 0 ||
254 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
255 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
256 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
257 strncmp(sysenv, "MacBookPro4,1", 13) == 0 ||
258 strncmp(sysenv, "Macmini1,1", 10) == 0) {
260 printf("Disabling LEGACY_USB_EN bit on "
262 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
268 * Good {morning,afternoon,evening,night}.
272 panicifcpuunsupported();
278 * Display physical memory if SMBIOS reports reasonable amount.
281 sysenv = kern_getenv("smbios.memory.enabled");
282 if (sysenv != NULL) {
283 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
286 if (memsize < ptoa((uintmax_t)vm_free_count()))
287 memsize = ptoa((uintmax_t)Maxmem);
288 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
289 realmem = atop(memsize);
292 * Display any holes after the first chunk of extended memory.
297 printf("Physical memory chunk(s):\n");
298 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
301 size = phys_avail[indx + 1] - phys_avail[indx];
303 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
304 (uintmax_t)phys_avail[indx],
305 (uintmax_t)phys_avail[indx + 1] - 1,
306 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
310 vm_ksubmap_init(&kmi);
312 printf("avail memory = %ju (%ju MB)\n",
313 ptoa((uintmax_t)vm_free_count()),
314 ptoa((uintmax_t)vm_free_count()) / 1048576);
317 * Set up buffers, so they can be used to read disk labels.
320 vm_pager_bufferinit();
325 * Send an interrupt to process.
327 * Stack is set up to allow sigcode stored
328 * at top to call routine, followed by call
329 * to sigreturn routine below. After sigreturn
330 * resets the signal mask, the stack, and the
331 * frame pointer, it returns to the user
336 osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
338 struct osigframe sf, *fp;
342 struct trapframe *regs;
348 PROC_LOCK_ASSERT(p, MA_OWNED);
349 sig = ksi->ksi_signo;
351 mtx_assert(&psp->ps_mtx, MA_OWNED);
353 oonstack = sigonstack(regs->tf_esp);
355 /* Allocate space for the signal handler context. */
356 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
357 SIGISMEMBER(psp->ps_sigonstack, sig)) {
358 fp = (struct osigframe *)((uintptr_t)td->td_sigstk.ss_sp +
359 td->td_sigstk.ss_size - sizeof(struct osigframe));
360 #if defined(COMPAT_43)
361 td->td_sigstk.ss_flags |= SS_ONSTACK;
364 fp = (struct osigframe *)regs->tf_esp - 1;
366 /* Build the argument list for the signal handler. */
368 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
369 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
370 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
371 /* Signal handler installed with SA_SIGINFO. */
372 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
373 sf.sf_siginfo.si_signo = sig;
374 sf.sf_siginfo.si_code = ksi->ksi_code;
375 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
378 /* Old FreeBSD-style arguments. */
379 sf.sf_arg2 = ksi->ksi_code;
380 sf.sf_addr = (register_t)ksi->ksi_addr;
381 sf.sf_ahu.sf_handler = catcher;
383 mtx_unlock(&psp->ps_mtx);
386 /* Save most if not all of trap frame. */
387 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
388 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
389 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
390 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
391 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
392 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
393 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
394 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
395 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
396 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
397 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
398 sf.sf_siginfo.si_sc.sc_gs = rgs();
399 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
401 /* Build the signal context to be used by osigreturn(). */
402 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
403 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
404 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
405 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
406 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
407 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
408 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
409 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
412 * If we're a vm86 process, we want to save the segment registers.
413 * We also change eflags to be our emulated eflags, not the actual
416 if (regs->tf_eflags & PSL_VM) {
417 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */
418 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
419 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
421 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
422 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
423 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
424 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
426 if (vm86->vm86_has_vme == 0)
427 sf.sf_siginfo.si_sc.sc_ps =
428 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
429 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
431 /* See sendsig() for comments. */
432 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
436 * Copy the sigframe out to the user's stack.
438 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
443 regs->tf_esp = (int)fp;
444 if (p->p_sysent->sv_sigcode_base != 0) {
445 regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
448 /* a.out sysentvec does not use shared page */
449 regs->tf_eip = p->p_sysent->sv_psstrings - szosigcode;
451 regs->tf_eflags &= ~(PSL_T | PSL_D);
452 regs->tf_cs = _ucodesel;
453 regs->tf_ds = _udatasel;
454 regs->tf_es = _udatasel;
455 regs->tf_fs = _udatasel;
457 regs->tf_ss = _udatasel;
459 mtx_lock(&psp->ps_mtx);
461 #endif /* COMPAT_43 */
463 #ifdef COMPAT_FREEBSD4
465 freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
467 struct sigframe4 sf, *sfp;
471 struct trapframe *regs;
477 PROC_LOCK_ASSERT(p, MA_OWNED);
478 sig = ksi->ksi_signo;
480 mtx_assert(&psp->ps_mtx, MA_OWNED);
482 oonstack = sigonstack(regs->tf_esp);
484 /* Save user context. */
485 bzero(&sf, sizeof(sf));
486 sf.sf_uc.uc_sigmask = *mask;
487 sf.sf_uc.uc_stack = td->td_sigstk;
488 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
489 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
490 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
491 sf.sf_uc.uc_mcontext.mc_gs = rgs();
492 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
493 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
494 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
495 bzero(sf.sf_uc.uc_mcontext.__spare__,
496 sizeof(sf.sf_uc.uc_mcontext.__spare__));
497 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
499 /* Allocate space for the signal handler context. */
500 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
501 SIGISMEMBER(psp->ps_sigonstack, sig)) {
502 sfp = (struct sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
503 td->td_sigstk.ss_size - sizeof(struct sigframe4));
504 #if defined(COMPAT_43)
505 td->td_sigstk.ss_flags |= SS_ONSTACK;
508 sfp = (struct sigframe4 *)regs->tf_esp - 1;
510 /* Build the argument list for the signal handler. */
512 sf.sf_ucontext = (register_t)&sfp->sf_uc;
513 bzero(&sf.sf_si, sizeof(sf.sf_si));
514 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
515 /* Signal handler installed with SA_SIGINFO. */
516 sf.sf_siginfo = (register_t)&sfp->sf_si;
517 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
519 /* Fill in POSIX parts */
520 sf.sf_si.si_signo = sig;
521 sf.sf_si.si_code = ksi->ksi_code;
522 sf.sf_si.si_addr = ksi->ksi_addr;
524 /* Old FreeBSD-style arguments. */
525 sf.sf_siginfo = ksi->ksi_code;
526 sf.sf_addr = (register_t)ksi->ksi_addr;
527 sf.sf_ahu.sf_handler = catcher;
529 mtx_unlock(&psp->ps_mtx);
533 * If we're a vm86 process, we want to save the segment registers.
534 * We also change eflags to be our emulated eflags, not the actual
537 if (regs->tf_eflags & PSL_VM) {
538 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
539 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
541 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
542 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
543 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
544 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
546 if (vm86->vm86_has_vme == 0)
547 sf.sf_uc.uc_mcontext.mc_eflags =
548 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
549 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
552 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
553 * syscalls made by the signal handler. This just avoids
554 * wasting time for our lazy fixup of such faults. PSL_NT
555 * does nothing in vm86 mode, but vm86 programs can set it
556 * almost legitimately in probes for old cpu types.
558 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
562 * Copy the sigframe out to the user's stack.
564 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
569 regs->tf_esp = (int)sfp;
570 regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
572 regs->tf_eflags &= ~(PSL_T | PSL_D);
573 regs->tf_cs = _ucodesel;
574 regs->tf_ds = _udatasel;
575 regs->tf_es = _udatasel;
576 regs->tf_fs = _udatasel;
577 regs->tf_ss = _udatasel;
579 mtx_lock(&psp->ps_mtx);
581 #endif /* COMPAT_FREEBSD4 */
584 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
586 struct sigframe sf, *sfp;
591 struct trapframe *regs;
592 struct segment_descriptor *sdp;
600 PROC_LOCK_ASSERT(p, MA_OWNED);
601 sig = ksi->ksi_signo;
603 mtx_assert(&psp->ps_mtx, MA_OWNED);
604 #ifdef COMPAT_FREEBSD4
605 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
606 freebsd4_sendsig(catcher, ksi, mask);
611 if (SIGISMEMBER(psp->ps_osigset, sig)) {
612 osendsig(catcher, ksi, mask);
617 oonstack = sigonstack(regs->tf_esp);
619 if (cpu_max_ext_state_size > sizeof(union savefpu) && use_xsave) {
620 xfpusave_len = cpu_max_ext_state_size - sizeof(union savefpu);
621 xfpusave = __builtin_alloca(xfpusave_len);
627 /* Save user context. */
628 bzero(&sf, sizeof(sf));
629 sf.sf_uc.uc_sigmask = *mask;
630 sf.sf_uc.uc_stack = td->td_sigstk;
631 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
632 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
633 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
634 sf.sf_uc.uc_mcontext.mc_gs = rgs();
635 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
636 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
637 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
640 * Unconditionally fill the fsbase and gsbase into the mcontext.
642 sdp = &td->td_pcb->pcb_fsd;
643 sf.sf_uc.uc_mcontext.mc_fsbase = sdp->sd_hibase << 24 |
645 sdp = &td->td_pcb->pcb_gsd;
646 sf.sf_uc.uc_mcontext.mc_gsbase = sdp->sd_hibase << 24 |
648 bzero(sf.sf_uc.uc_mcontext.mc_spare2,
649 sizeof(sf.sf_uc.uc_mcontext.mc_spare2));
651 /* Allocate space for the signal handler context. */
652 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
653 SIGISMEMBER(psp->ps_sigonstack, sig)) {
654 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
655 #if defined(COMPAT_43)
656 td->td_sigstk.ss_flags |= SS_ONSTACK;
659 sp = (char *)regs->tf_esp - 128;
660 if (xfpusave != NULL) {
662 sp = (char *)((unsigned int)sp & ~0x3F);
663 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
665 sp -= sizeof(struct sigframe);
667 /* Align to 16 bytes. */
668 sfp = (struct sigframe *)((unsigned int)sp & ~0xF);
670 /* Build the argument list for the signal handler. */
672 sf.sf_ucontext = (register_t)&sfp->sf_uc;
673 bzero(&sf.sf_si, sizeof(sf.sf_si));
674 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
675 /* Signal handler installed with SA_SIGINFO. */
676 sf.sf_siginfo = (register_t)&sfp->sf_si;
677 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
679 /* Fill in POSIX parts */
680 sf.sf_si = ksi->ksi_info;
681 sf.sf_si.si_signo = sig; /* maybe a translated signal */
683 /* Old FreeBSD-style arguments. */
684 sf.sf_siginfo = ksi->ksi_code;
685 sf.sf_addr = (register_t)ksi->ksi_addr;
686 sf.sf_ahu.sf_handler = catcher;
688 mtx_unlock(&psp->ps_mtx);
692 * If we're a vm86 process, we want to save the segment registers.
693 * We also change eflags to be our emulated eflags, not the actual
696 if (regs->tf_eflags & PSL_VM) {
697 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
698 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
700 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
701 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
702 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
703 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
705 if (vm86->vm86_has_vme == 0)
706 sf.sf_uc.uc_mcontext.mc_eflags =
707 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
708 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
711 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
712 * syscalls made by the signal handler. This just avoids
713 * wasting time for our lazy fixup of such faults. PSL_NT
714 * does nothing in vm86 mode, but vm86 programs can set it
715 * almost legitimately in probes for old cpu types.
717 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
721 * Copy the sigframe out to the user's stack.
723 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
724 (xfpusave != NULL && copyout(xfpusave,
725 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
731 regs->tf_esp = (int)sfp;
732 regs->tf_eip = p->p_sysent->sv_sigcode_base;
733 if (regs->tf_eip == 0)
734 regs->tf_eip = p->p_sysent->sv_psstrings - szsigcode;
735 regs->tf_eflags &= ~(PSL_T | PSL_D);
736 regs->tf_cs = _ucodesel;
737 regs->tf_ds = _udatasel;
738 regs->tf_es = _udatasel;
739 regs->tf_fs = _udatasel;
740 regs->tf_ss = _udatasel;
742 mtx_lock(&psp->ps_mtx);
746 * System call to cleanup state after a signal
747 * has been taken. Reset signal mask and
748 * stack state from context left by sendsig (above).
749 * Return to previous pc and psl as specified by
750 * context left by sendsig. Check carefully to
751 * make sure that the user has not modified the
752 * state to gain improper privileges.
760 struct osigreturn_args /* {
761 struct osigcontext *sigcntxp;
764 struct osigcontext sc;
765 struct trapframe *regs;
766 struct osigcontext *scp;
771 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
776 if (eflags & PSL_VM) {
777 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
778 struct vm86_kernel *vm86;
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.
784 if (td->td_pcb->pcb_ext == 0)
786 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
787 if (vm86->vm86_inited == 0)
790 /* Go back to user mode if both flags are set. */
791 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
792 ksiginfo_init_trap(&ksi);
793 ksi.ksi_signo = SIGBUS;
794 ksi.ksi_code = BUS_OBJERR;
795 ksi.ksi_addr = (void *)regs->tf_eip;
796 trapsignal(td, &ksi);
799 if (vm86->vm86_has_vme) {
800 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
801 (eflags & VME_USERCHANGE) | PSL_VM;
803 vm86->vm86_eflags = eflags; /* save VIF, VIP */
804 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
805 (eflags & VM_USERCHANGE) | PSL_VM;
807 tf->tf_vm86_ds = scp->sc_ds;
808 tf->tf_vm86_es = scp->sc_es;
809 tf->tf_vm86_fs = scp->sc_fs;
810 tf->tf_vm86_gs = scp->sc_gs;
811 tf->tf_ds = _udatasel;
812 tf->tf_es = _udatasel;
813 tf->tf_fs = _udatasel;
816 * Don't allow users to change privileged or reserved flags.
818 if (!EFL_SECURE(eflags, regs->tf_eflags)) {
823 * Don't allow users to load a valid privileged %cs. Let the
824 * hardware check for invalid selectors, excess privilege in
825 * other selectors, invalid %eip's and invalid %esp's.
827 if (!CS_SECURE(scp->sc_cs)) {
828 ksiginfo_init_trap(&ksi);
829 ksi.ksi_signo = SIGBUS;
830 ksi.ksi_code = BUS_OBJERR;
831 ksi.ksi_trapno = T_PROTFLT;
832 ksi.ksi_addr = (void *)regs->tf_eip;
833 trapsignal(td, &ksi);
836 regs->tf_ds = scp->sc_ds;
837 regs->tf_es = scp->sc_es;
838 regs->tf_fs = scp->sc_fs;
841 /* Restore remaining registers. */
842 regs->tf_eax = scp->sc_eax;
843 regs->tf_ebx = scp->sc_ebx;
844 regs->tf_ecx = scp->sc_ecx;
845 regs->tf_edx = scp->sc_edx;
846 regs->tf_esi = scp->sc_esi;
847 regs->tf_edi = scp->sc_edi;
848 regs->tf_cs = scp->sc_cs;
849 regs->tf_ss = scp->sc_ss;
850 regs->tf_isp = scp->sc_isp;
851 regs->tf_ebp = scp->sc_fp;
852 regs->tf_esp = scp->sc_sp;
853 regs->tf_eip = scp->sc_pc;
854 regs->tf_eflags = eflags;
856 #if defined(COMPAT_43)
857 if (scp->sc_onstack & 1)
858 td->td_sigstk.ss_flags |= SS_ONSTACK;
860 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
862 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
864 return (EJUSTRETURN);
866 #endif /* COMPAT_43 */
868 #ifdef COMPAT_FREEBSD4
873 freebsd4_sigreturn(td, uap)
875 struct freebsd4_sigreturn_args /* {
876 const ucontext4 *sigcntxp;
880 struct trapframe *regs;
881 struct ucontext4 *ucp;
882 int cs, eflags, error;
885 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
890 eflags = ucp->uc_mcontext.mc_eflags;
891 if (eflags & PSL_VM) {
892 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
893 struct vm86_kernel *vm86;
896 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
897 * set up the vm86 area, and we can't enter vm86 mode.
899 if (td->td_pcb->pcb_ext == 0)
901 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
902 if (vm86->vm86_inited == 0)
905 /* Go back to user mode if both flags are set. */
906 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
907 ksiginfo_init_trap(&ksi);
908 ksi.ksi_signo = SIGBUS;
909 ksi.ksi_code = BUS_OBJERR;
910 ksi.ksi_addr = (void *)regs->tf_eip;
911 trapsignal(td, &ksi);
913 if (vm86->vm86_has_vme) {
914 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
915 (eflags & VME_USERCHANGE) | PSL_VM;
917 vm86->vm86_eflags = eflags; /* save VIF, VIP */
918 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
919 (eflags & VM_USERCHANGE) | PSL_VM;
921 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
922 tf->tf_eflags = eflags;
923 tf->tf_vm86_ds = tf->tf_ds;
924 tf->tf_vm86_es = tf->tf_es;
925 tf->tf_vm86_fs = tf->tf_fs;
926 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
927 tf->tf_ds = _udatasel;
928 tf->tf_es = _udatasel;
929 tf->tf_fs = _udatasel;
932 * Don't allow users to change privileged or reserved flags.
934 if (!EFL_SECURE(eflags, regs->tf_eflags)) {
935 uprintf("pid %d (%s): freebsd4_sigreturn eflags = 0x%x\n",
936 td->td_proc->p_pid, td->td_name, eflags);
941 * Don't allow users to load a valid privileged %cs. Let the
942 * hardware check for invalid selectors, excess privilege in
943 * other selectors, invalid %eip's and invalid %esp's.
945 cs = ucp->uc_mcontext.mc_cs;
946 if (!CS_SECURE(cs)) {
947 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
948 td->td_proc->p_pid, td->td_name, cs);
949 ksiginfo_init_trap(&ksi);
950 ksi.ksi_signo = SIGBUS;
951 ksi.ksi_code = BUS_OBJERR;
952 ksi.ksi_trapno = T_PROTFLT;
953 ksi.ksi_addr = (void *)regs->tf_eip;
954 trapsignal(td, &ksi);
958 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
961 #if defined(COMPAT_43)
962 if (ucp->uc_mcontext.mc_onstack & 1)
963 td->td_sigstk.ss_flags |= SS_ONSTACK;
965 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
967 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
968 return (EJUSTRETURN);
970 #endif /* COMPAT_FREEBSD4 */
976 sys_sigreturn(td, uap)
978 struct sigreturn_args /* {
979 const struct __ucontext *sigcntxp;
984 struct trapframe *regs;
987 size_t xfpustate_len;
988 int cs, eflags, error, ret;
993 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
997 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
998 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
999 td->td_name, ucp->uc_mcontext.mc_flags);
1002 regs = td->td_frame;
1003 eflags = ucp->uc_mcontext.mc_eflags;
1004 if (eflags & PSL_VM) {
1005 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
1006 struct vm86_kernel *vm86;
1009 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
1010 * set up the vm86 area, and we can't enter vm86 mode.
1012 if (td->td_pcb->pcb_ext == 0)
1014 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
1015 if (vm86->vm86_inited == 0)
1018 /* Go back to user mode if both flags are set. */
1019 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
1020 ksiginfo_init_trap(&ksi);
1021 ksi.ksi_signo = SIGBUS;
1022 ksi.ksi_code = BUS_OBJERR;
1023 ksi.ksi_addr = (void *)regs->tf_eip;
1024 trapsignal(td, &ksi);
1027 if (vm86->vm86_has_vme) {
1028 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
1029 (eflags & VME_USERCHANGE) | PSL_VM;
1031 vm86->vm86_eflags = eflags; /* save VIF, VIP */
1032 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
1033 (eflags & VM_USERCHANGE) | PSL_VM;
1035 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
1036 tf->tf_eflags = eflags;
1037 tf->tf_vm86_ds = tf->tf_ds;
1038 tf->tf_vm86_es = tf->tf_es;
1039 tf->tf_vm86_fs = tf->tf_fs;
1040 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
1041 tf->tf_ds = _udatasel;
1042 tf->tf_es = _udatasel;
1043 tf->tf_fs = _udatasel;
1046 * Don't allow users to change privileged or reserved flags.
1048 if (!EFL_SECURE(eflags, regs->tf_eflags)) {
1049 uprintf("pid %d (%s): sigreturn eflags = 0x%x\n",
1050 td->td_proc->p_pid, td->td_name, eflags);
1055 * Don't allow users to load a valid privileged %cs. Let the
1056 * hardware check for invalid selectors, excess privilege in
1057 * other selectors, invalid %eip's and invalid %esp's.
1059 cs = ucp->uc_mcontext.mc_cs;
1060 if (!CS_SECURE(cs)) {
1061 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
1062 td->td_proc->p_pid, td->td_name, cs);
1063 ksiginfo_init_trap(&ksi);
1064 ksi.ksi_signo = SIGBUS;
1065 ksi.ksi_code = BUS_OBJERR;
1066 ksi.ksi_trapno = T_PROTFLT;
1067 ksi.ksi_addr = (void *)regs->tf_eip;
1068 trapsignal(td, &ksi);
1072 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
1073 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
1074 if (xfpustate_len > cpu_max_ext_state_size -
1075 sizeof(union savefpu)) {
1077 "pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
1078 p->p_pid, td->td_name, xfpustate_len);
1081 xfpustate = __builtin_alloca(xfpustate_len);
1082 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate,
1083 xfpustate, xfpustate_len);
1086 "pid %d (%s): sigreturn copying xfpustate failed\n",
1087 p->p_pid, td->td_name);
1094 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
1098 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
1101 #if defined(COMPAT_43)
1102 if (ucp->uc_mcontext.mc_onstack & 1)
1103 td->td_sigstk.ss_flags |= SS_ONSTACK;
1105 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
1108 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
1109 return (EJUSTRETURN);
1114 setup_priv_lcall_gate(struct proc *p)
1116 struct i386_ldt_args uap;
1117 union descriptor desc;
1120 bzero(&uap, sizeof(uap));
1123 lcall_addr = p->p_sysent->sv_psstrings - sz_lcall_tramp;
1124 bzero(&desc, sizeof(desc));
1125 desc.sd.sd_type = SDT_MEMERA;
1126 desc.sd.sd_dpl = SEL_UPL;
1128 desc.sd.sd_def32 = 1;
1129 desc.sd.sd_gran = 1;
1130 desc.sd.sd_lolimit = 0xffff;
1131 desc.sd.sd_hilimit = 0xf;
1132 desc.sd.sd_lobase = lcall_addr;
1133 desc.sd.sd_hibase = lcall_addr >> 24;
1134 i386_set_ldt(curthread, &uap, &desc);
1139 * Reset registers to default values on exec.
1142 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
1144 struct trapframe *regs;
1146 register_t saved_eflags;
1148 regs = td->td_frame;
1151 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
1152 pcb->pcb_gs = _udatasel;
1155 mtx_lock_spin(&dt_lock);
1156 if (td->td_proc->p_md.md_ldt != NULL)
1159 mtx_unlock_spin(&dt_lock);
1162 if (td->td_proc->p_sysent->sv_psstrings !=
1163 elf32_freebsd_sysvec.sv_psstrings)
1164 setup_priv_lcall_gate(td->td_proc);
1168 * Reset the fs and gs bases. The values from the old address
1169 * space do not make sense for the new program. In particular,
1170 * gsbase might be the TLS base for the old program but the new
1171 * program has no TLS now.
1176 /* Make sure edx is 0x0 on entry. Linux binaries depend on it. */
1177 saved_eflags = regs->tf_eflags & PSL_T;
1178 bzero((char *)regs, sizeof(struct trapframe));
1179 regs->tf_eip = imgp->entry_addr;
1180 regs->tf_esp = stack;
1181 regs->tf_eflags = PSL_USER | saved_eflags;
1182 regs->tf_ss = _udatasel;
1183 regs->tf_ds = _udatasel;
1184 regs->tf_es = _udatasel;
1185 regs->tf_fs = _udatasel;
1186 regs->tf_cs = _ucodesel;
1188 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1189 regs->tf_ebx = imgp->ps_strings;
1192 * Reset the hardware debug registers if they were in use.
1193 * They won't have any meaning for the newly exec'd process.
1195 if (pcb->pcb_flags & PCB_DBREGS) {
1202 if (pcb == curpcb) {
1204 * Clear the debug registers on the running
1205 * CPU, otherwise they will end up affecting
1206 * the next process we switch to.
1210 pcb->pcb_flags &= ~PCB_DBREGS;
1213 pcb->pcb_initial_npxcw = __INITIAL_NPXCW__;
1216 * Drop the FP state if we hold it, so that the process gets a
1217 * clean FP state if it uses the FPU again.
1230 * CR0_MP, CR0_NE and CR0_TS are set for NPX (FPU) support:
1232 * Prepare to trap all ESC (i.e., NPX) instructions and all WAIT
1233 * instructions. We must set the CR0_MP bit and use the CR0_TS
1234 * bit to control the trap, because setting the CR0_EM bit does
1235 * not cause WAIT instructions to trap. It's important to trap
1236 * WAIT instructions - otherwise the "wait" variants of no-wait
1237 * control instructions would degenerate to the "no-wait" variants
1238 * after FP context switches but work correctly otherwise. It's
1239 * particularly important to trap WAITs when there is no NPX -
1240 * otherwise the "wait" variants would always degenerate.
1242 * Try setting CR0_NE to get correct error reporting on 486DX's.
1243 * Setting it should fail or do nothing on lesser processors.
1245 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
1250 u_long bootdev; /* not a struct cdev *- encoding is different */
1251 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1252 CTLFLAG_RD, &bootdev, 0, "Maybe the Boot device (not in struct cdev *format)");
1254 static char bootmethod[16] = "BIOS";
1255 SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0,
1256 "System firmware boot method");
1259 * Initialize 386 and configure to run kernel
1263 * Initialize segments & interrupt table
1268 struct mtx dt_lock; /* lock for GDT and LDT */
1270 union descriptor gdt0[NGDT]; /* initial global descriptor table */
1271 union descriptor *gdt = gdt0; /* global descriptor table */
1273 union descriptor *ldt; /* local descriptor table */
1275 static struct gate_descriptor idt0[NIDT];
1276 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1278 static struct i386tss *dblfault_tss;
1279 static char *dblfault_stack;
1281 static struct i386tss common_tss0;
1283 vm_offset_t proc0kstack;
1286 * software prototypes -- in more palatable form.
1288 * GCODE_SEL through GUDATA_SEL must be in this order for syscall/sysret
1289 * GUFS_SEL and GUGS_SEL must be in this order (swtch.s knows it)
1291 struct soft_segment_descriptor gdt_segs[] = {
1292 /* GNULL_SEL 0 Null Descriptor */
1298 .ssd_xx = 0, .ssd_xx1 = 0,
1301 /* GPRIV_SEL 1 SMP Per-Processor Private Data Descriptor */
1303 .ssd_limit = 0xfffff,
1304 .ssd_type = SDT_MEMRWA,
1307 .ssd_xx = 0, .ssd_xx1 = 0,
1310 /* GUFS_SEL 2 %fs Descriptor for user */
1312 .ssd_limit = 0xfffff,
1313 .ssd_type = SDT_MEMRWA,
1316 .ssd_xx = 0, .ssd_xx1 = 0,
1319 /* GUGS_SEL 3 %gs Descriptor for user */
1321 .ssd_limit = 0xfffff,
1322 .ssd_type = SDT_MEMRWA,
1325 .ssd_xx = 0, .ssd_xx1 = 0,
1328 /* GCODE_SEL 4 Code Descriptor for kernel */
1330 .ssd_limit = 0xfffff,
1331 .ssd_type = SDT_MEMERA,
1334 .ssd_xx = 0, .ssd_xx1 = 0,
1337 /* GDATA_SEL 5 Data Descriptor for kernel */
1339 .ssd_limit = 0xfffff,
1340 .ssd_type = SDT_MEMRWA,
1343 .ssd_xx = 0, .ssd_xx1 = 0,
1346 /* GUCODE_SEL 6 Code Descriptor for user */
1348 .ssd_limit = 0xfffff,
1349 .ssd_type = SDT_MEMERA,
1352 .ssd_xx = 0, .ssd_xx1 = 0,
1355 /* GUDATA_SEL 7 Data Descriptor for user */
1357 .ssd_limit = 0xfffff,
1358 .ssd_type = SDT_MEMRWA,
1361 .ssd_xx = 0, .ssd_xx1 = 0,
1364 /* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1365 { .ssd_base = 0x400,
1366 .ssd_limit = 0xfffff,
1367 .ssd_type = SDT_MEMRWA,
1370 .ssd_xx = 0, .ssd_xx1 = 0,
1373 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
1376 .ssd_limit = sizeof(struct i386tss)-1,
1377 .ssd_type = SDT_SYS386TSS,
1380 .ssd_xx = 0, .ssd_xx1 = 0,
1383 /* GLDT_SEL 10 LDT Descriptor */
1385 .ssd_limit = sizeof(union descriptor) * NLDT - 1,
1386 .ssd_type = SDT_SYSLDT,
1389 .ssd_xx = 0, .ssd_xx1 = 0,
1392 /* GUSERLDT_SEL 11 User LDT Descriptor per process */
1394 .ssd_limit = (512 * sizeof(union descriptor)-1),
1395 .ssd_type = SDT_SYSLDT,
1398 .ssd_xx = 0, .ssd_xx1 = 0,
1401 /* GPANIC_SEL 12 Panic Tss Descriptor */
1403 .ssd_limit = sizeof(struct i386tss)-1,
1404 .ssd_type = SDT_SYS386TSS,
1407 .ssd_xx = 0, .ssd_xx1 = 0,
1410 /* GBIOSCODE32_SEL 13 BIOS 32-bit interface (32bit Code) */
1412 .ssd_limit = 0xfffff,
1413 .ssd_type = SDT_MEMERA,
1416 .ssd_xx = 0, .ssd_xx1 = 0,
1419 /* GBIOSCODE16_SEL 14 BIOS 32-bit interface (16bit Code) */
1421 .ssd_limit = 0xfffff,
1422 .ssd_type = SDT_MEMERA,
1425 .ssd_xx = 0, .ssd_xx1 = 0,
1428 /* GBIOSDATA_SEL 15 BIOS 32-bit interface (Data) */
1430 .ssd_limit = 0xfffff,
1431 .ssd_type = SDT_MEMRWA,
1434 .ssd_xx = 0, .ssd_xx1 = 0,
1437 /* GBIOSUTIL_SEL 16 BIOS 16-bit interface (Utility) */
1439 .ssd_limit = 0xfffff,
1440 .ssd_type = SDT_MEMRWA,
1443 .ssd_xx = 0, .ssd_xx1 = 0,
1446 /* GBIOSARGS_SEL 17 BIOS 16-bit interface (Arguments) */
1448 .ssd_limit = 0xfffff,
1449 .ssd_type = SDT_MEMRWA,
1452 .ssd_xx = 0, .ssd_xx1 = 0,
1455 /* GNDIS_SEL 18 NDIS Descriptor */
1461 .ssd_xx = 0, .ssd_xx1 = 0,
1466 static struct soft_segment_descriptor ldt_segs[] = {
1467 /* Null Descriptor - overwritten by call gate */
1473 .ssd_xx = 0, .ssd_xx1 = 0,
1476 /* Null Descriptor - overwritten by call gate */
1482 .ssd_xx = 0, .ssd_xx1 = 0,
1485 /* Null Descriptor - overwritten by call gate */
1491 .ssd_xx = 0, .ssd_xx1 = 0,
1494 /* Code Descriptor for user */
1496 .ssd_limit = 0xfffff,
1497 .ssd_type = SDT_MEMERA,
1500 .ssd_xx = 0, .ssd_xx1 = 0,
1503 /* Null Descriptor - overwritten by call gate */
1509 .ssd_xx = 0, .ssd_xx1 = 0,
1512 /* Data Descriptor for user */
1514 .ssd_limit = 0xfffff,
1515 .ssd_type = SDT_MEMRWA,
1518 .ssd_xx = 0, .ssd_xx1 = 0,
1523 uintptr_t setidt_disp;
1526 setidt(int idx, inthand_t *func, int typ, int dpl, int selec)
1530 off = func != NULL ? (uintptr_t)func + setidt_disp : 0;
1531 setidt_nodisp(idx, off, typ, dpl, selec);
1535 setidt_nodisp(int idx, uintptr_t off, int typ, int dpl, int selec)
1537 struct gate_descriptor *ip;
1540 ip->gd_looffset = off;
1541 ip->gd_selector = selec;
1547 ip->gd_hioffset = ((u_int)off) >> 16 ;
1551 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1552 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1553 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1554 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1556 #ifdef KDTRACE_HOOKS
1560 IDTVEC(xen_intr_upcall),
1562 IDTVEC(int0x80_syscall);
1566 * Display the index and function name of any IDT entries that don't use
1567 * the default 'rsvd' entry point.
1569 DB_SHOW_COMMAND(idt, db_show_idt)
1571 struct gate_descriptor *ip;
1573 uintptr_t func, func_trm;
1577 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1578 if (ip->gd_type == SDT_SYSTASKGT) {
1579 db_printf("%3d\t<TASK>\n", idx);
1581 func = (ip->gd_hioffset << 16 | ip->gd_looffset);
1582 if (func >= PMAP_TRM_MIN_ADDRESS) {
1584 func -= setidt_disp;
1588 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1589 db_printf("%3d\t", idx);
1590 db_printsym(func, DB_STGY_PROC);
1592 db_printf(" (trampoline %#x)",
1601 /* Show privileged registers. */
1602 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
1604 uint64_t idtr, gdtr;
1607 db_printf("idtr\t0x%08x/%04x\n",
1608 (u_int)(idtr >> 16), (u_int)idtr & 0xffff);
1610 db_printf("gdtr\t0x%08x/%04x\n",
1611 (u_int)(gdtr >> 16), (u_int)gdtr & 0xffff);
1612 db_printf("ldtr\t0x%04x\n", rldt());
1613 db_printf("tr\t0x%04x\n", rtr());
1614 db_printf("cr0\t0x%08x\n", rcr0());
1615 db_printf("cr2\t0x%08x\n", rcr2());
1616 db_printf("cr3\t0x%08x\n", rcr3());
1617 db_printf("cr4\t0x%08x\n", rcr4());
1618 if (rcr4() & CR4_XSAVE)
1619 db_printf("xcr0\t0x%016llx\n", rxcr(0));
1620 if (amd_feature & (AMDID_NX | AMDID_LM))
1621 db_printf("EFER\t0x%016llx\n", rdmsr(MSR_EFER));
1622 if (cpu_feature2 & (CPUID2_VMX | CPUID2_SMX))
1623 db_printf("FEATURES_CTL\t0x%016llx\n",
1624 rdmsr(MSR_IA32_FEATURE_CONTROL));
1625 if ((cpu_vendor_id == CPU_VENDOR_INTEL ||
1626 cpu_vendor_id == CPU_VENDOR_AMD) && CPUID_TO_FAMILY(cpu_id) >= 6)
1627 db_printf("DEBUG_CTL\t0x%016llx\n", rdmsr(MSR_DEBUGCTLMSR));
1628 if (cpu_feature & CPUID_PAT)
1629 db_printf("PAT\t0x%016llx\n", rdmsr(MSR_PAT));
1632 DB_SHOW_COMMAND(dbregs, db_show_dbregs)
1635 db_printf("dr0\t0x%08x\n", rdr0());
1636 db_printf("dr1\t0x%08x\n", rdr1());
1637 db_printf("dr2\t0x%08x\n", rdr2());
1638 db_printf("dr3\t0x%08x\n", rdr3());
1639 db_printf("dr6\t0x%08x\n", rdr6());
1640 db_printf("dr7\t0x%08x\n", rdr7());
1643 DB_SHOW_COMMAND(frame, db_show_frame)
1645 struct trapframe *frame;
1647 frame = have_addr ? (struct trapframe *)addr : curthread->td_frame;
1648 printf("ss %#x esp %#x efl %#x cs %#x eip %#x\n",
1649 frame->tf_ss, frame->tf_esp, frame->tf_eflags, frame->tf_cs,
1651 printf("err %#x trapno %d\n", frame->tf_err, frame->tf_trapno);
1652 printf("ds %#x es %#x fs %#x\n",
1653 frame->tf_ds, frame->tf_es, frame->tf_fs);
1654 printf("eax %#x ecx %#x edx %#x ebx %#x\n",
1655 frame->tf_eax, frame->tf_ecx, frame->tf_edx, frame->tf_ebx);
1656 printf("ebp %#x esi %#x edi %#x\n",
1657 frame->tf_ebp, frame->tf_esi, frame->tf_edi);
1664 struct segment_descriptor *sd;
1665 struct soft_segment_descriptor *ssd;
1667 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1668 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1669 ssd->ssd_type = sd->sd_type;
1670 ssd->ssd_dpl = sd->sd_dpl;
1671 ssd->ssd_p = sd->sd_p;
1672 ssd->ssd_def32 = sd->sd_def32;
1673 ssd->ssd_gran = sd->sd_gran;
1677 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
1681 int i, insert_idx, physmap_idx;
1683 physmap_idx = *physmap_idxp;
1688 lim = 0x100000000; /* 4G */
1689 if (pae_mode && above4g_allow)
1690 lim = above24g_allow ? -1ULL : 0x600000000; /* 24G */
1692 printf("%uK of memory above %uGB ignored, pae %d "
1693 "above4g_allow %d above24g_allow %d\n",
1694 (u_int)(length / 1024), (u_int)(lim >> 30), pae_mode,
1695 above4g_allow, above24g_allow);
1698 if (base + length >= lim) {
1699 ign = base + length - lim;
1701 printf("%uK of memory above %uGB ignored, pae %d "
1702 "above4g_allow %d above24g_allow %d\n",
1703 (u_int)(ign / 1024), (u_int)(lim >> 30), pae_mode,
1704 above4g_allow, above24g_allow);
1708 * Find insertion point while checking for overlap. Start off by
1709 * assuming the new entry will be added to the end.
1711 insert_idx = physmap_idx + 2;
1712 for (i = 0; i <= physmap_idx; i += 2) {
1713 if (base < physmap[i + 1]) {
1714 if (base + length <= physmap[i]) {
1718 if (boothowto & RB_VERBOSE)
1720 "Overlapping memory regions, ignoring second region\n");
1725 /* See if we can prepend to the next entry. */
1726 if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) {
1727 physmap[insert_idx] = base;
1731 /* See if we can append to the previous entry. */
1732 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
1733 physmap[insert_idx - 1] += length;
1738 *physmap_idxp = physmap_idx;
1739 if (physmap_idx == PHYSMAP_SIZE) {
1741 "Too many segments in the physical address map, giving up\n");
1746 * Move the last 'N' entries down to make room for the new
1749 for (i = physmap_idx; i > insert_idx; i -= 2) {
1750 physmap[i] = physmap[i - 2];
1751 physmap[i + 1] = physmap[i - 1];
1754 /* Insert the new entry. */
1755 physmap[insert_idx] = base;
1756 physmap[insert_idx + 1] = base + length;
1761 add_smap_entry(struct bios_smap *smap, vm_paddr_t *physmap, int *physmap_idxp)
1763 if (boothowto & RB_VERBOSE)
1764 printf("SMAP type=%02x base=%016llx len=%016llx\n",
1765 smap->type, smap->base, smap->length);
1767 if (smap->type != SMAP_TYPE_MEMORY)
1770 return (add_physmap_entry(smap->base, smap->length, physmap,
1775 add_smap_entries(struct bios_smap *smapbase, vm_paddr_t *physmap,
1778 struct bios_smap *smap, *smapend;
1781 * Memory map from INT 15:E820.
1783 * subr_module.c says:
1784 * "Consumer may safely assume that size value precedes data."
1785 * ie: an int32_t immediately precedes SMAP.
1787 smapsize = *((u_int32_t *)smapbase - 1);
1788 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1790 for (smap = smapbase; smap < smapend; smap++)
1791 if (!add_smap_entry(smap, physmap, physmap_idxp))
1799 if (basemem > 640) {
1800 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1805 pmap_basemem_setup(basemem);
1809 * Populate the (physmap) array with base/bound pairs describing the
1810 * available physical memory in the system, then test this memory and
1811 * build the phys_avail array describing the actually-available memory.
1813 * If we cannot accurately determine the physical memory map, then use
1814 * value from the 0xE801 call, and failing that, the RTC.
1816 * Total memory size may be set by the kernel environment variable
1817 * hw.physmem or the compile-time define MAXMEM.
1819 * XXX first should be vm_paddr_t.
1822 getmemsize(int first)
1824 int has_smap, off, physmap_idx, pa_indx, da_indx;
1826 vm_paddr_t physmap[PHYSMAP_SIZE];
1827 quad_t dcons_addr, dcons_size, physmem_tunable;
1828 int hasbrokenint12, i, res;
1830 struct vm86frame vmf;
1831 struct vm86context vmc;
1833 struct bios_smap *smap, *smapbase;
1837 bzero(&vmf, sizeof(vmf));
1838 bzero(physmap, sizeof(physmap));
1842 * Tell the physical memory allocator about pages used to store
1843 * the kernel and preloaded data. See kmem_bootstrap_free().
1845 vm_phys_add_seg((vm_paddr_t)KERNLOAD, trunc_page(first));
1847 TUNABLE_INT_FETCH("hw.above4g_allow", &above4g_allow);
1848 TUNABLE_INT_FETCH("hw.above24g_allow", &above24g_allow);
1851 * Check if the loader supplied an SMAP memory map. If so,
1852 * use that and do not make any VM86 calls.
1855 kmdp = preload_search_by_type("elf kernel");
1857 kmdp = preload_search_by_type("elf32 kernel");
1858 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1859 MODINFO_METADATA | MODINFOMD_SMAP);
1860 if (smapbase != NULL) {
1861 add_smap_entries(smapbase, physmap, &physmap_idx);
1867 * Some newer BIOSes have a broken INT 12H implementation
1868 * which causes a kernel panic immediately. In this case, we
1869 * need use the SMAP to determine the base memory size.
1872 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1873 if (hasbrokenint12 == 0) {
1874 /* Use INT12 to determine base memory size. */
1875 vm86_intcall(0x12, &vmf);
1876 basemem = vmf.vmf_ax;
1881 * Fetch the memory map with INT 15:E820. Map page 1 R/W into
1882 * the kernel page table so we can use it as a buffer. The
1883 * kernel will unmap this page later.
1886 smap = (void *)vm86_addpage(&vmc, 1, PMAP_MAP_LOW + ptoa(1));
1887 res = vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1888 KASSERT(res != 0, ("vm86_getptr() failed: address not found"));
1892 vmf.vmf_eax = 0xE820;
1893 vmf.vmf_edx = SMAP_SIG;
1894 vmf.vmf_ecx = sizeof(struct bios_smap);
1895 i = vm86_datacall(0x15, &vmf, &vmc);
1896 if (i || vmf.vmf_eax != SMAP_SIG)
1899 if (!add_smap_entry(smap, physmap, &physmap_idx))
1901 } while (vmf.vmf_ebx != 0);
1905 * If we didn't fetch the "base memory" size from INT12,
1906 * figure it out from the SMAP (or just guess).
1909 for (i = 0; i <= physmap_idx; i += 2) {
1910 if (physmap[i] == 0x00000000) {
1911 basemem = physmap[i + 1] / 1024;
1916 /* XXX: If we couldn't find basemem from SMAP, just guess. */
1922 if (physmap[1] != 0)
1926 * If we failed to find an SMAP, figure out the extended
1927 * memory size. We will then build a simple memory map with
1928 * two segments, one for "base memory" and the second for
1929 * "extended memory". Note that "extended memory" starts at a
1930 * physical address of 1MB and that both basemem and extmem
1931 * are in units of 1KB.
1933 * First, try to fetch the extended memory size via INT 15:E801.
1935 vmf.vmf_ax = 0xE801;
1936 if (vm86_intcall(0x15, &vmf) == 0) {
1937 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1940 * If INT15:E801 fails, this is our last ditch effort
1941 * to determine the extended memory size. Currently
1942 * we prefer the RTC value over INT15:88.
1946 vm86_intcall(0x15, &vmf);
1947 extmem = vmf.vmf_ax;
1949 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1954 * Special hack for chipsets that still remap the 384k hole when
1955 * there's 16MB of memory - this really confuses people that
1956 * are trying to use bus mastering ISA controllers with the
1957 * "16MB limit"; they only have 16MB, but the remapping puts
1958 * them beyond the limit.
1960 * If extended memory is between 15-16MB (16-17MB phys address range),
1963 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1967 physmap[1] = basemem * 1024;
1969 physmap[physmap_idx] = 0x100000;
1970 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1974 * Now, physmap contains a map of physical memory.
1978 /* make hole for AP bootstrap code */
1979 alloc_ap_trampoline(physmap, &physmap_idx);
1983 * Maxmem isn't the "maximum memory", it's one larger than the
1984 * highest page of the physical address space. It should be
1985 * called something like "Maxphyspage". We may adjust this
1986 * based on ``hw.physmem'' and the results of the memory test.
1988 * This is especially confusing when it is much larger than the
1989 * memory size and is displayed as "realmem".
1991 Maxmem = atop(physmap[physmap_idx + 1]);
1994 Maxmem = MAXMEM / 4;
1997 if (TUNABLE_QUAD_FETCH("hw.physmem", &physmem_tunable))
1998 Maxmem = atop(physmem_tunable);
2001 * If we have an SMAP, don't allow MAXMEM or hw.physmem to extend
2002 * the amount of memory in the system.
2004 if (has_smap && Maxmem > atop(physmap[physmap_idx + 1]))
2005 Maxmem = atop(physmap[physmap_idx + 1]);
2008 * The boot memory test is disabled by default, as it takes a
2009 * significant amount of time on large-memory systems, and is
2010 * unfriendly to virtual machines as it unnecessarily touches all
2013 * A general name is used as the code may be extended to support
2014 * additional tests beyond the current "page present" test.
2017 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
2019 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
2020 (boothowto & RB_VERBOSE))
2021 printf("Physical memory use set to %ldK\n", Maxmem * 4);
2024 * If Maxmem has been increased beyond what the system has detected,
2025 * extend the last memory segment to the new limit.
2027 if (atop(physmap[physmap_idx + 1]) < Maxmem)
2028 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem);
2030 /* call pmap initialization to make new kernel address space */
2031 pmap_bootstrap(first);
2034 * Size up each available chunk of physical memory.
2036 physmap[0] = PAGE_SIZE; /* mask off page 0 */
2039 phys_avail[pa_indx++] = physmap[0];
2040 phys_avail[pa_indx] = physmap[0];
2041 dump_avail[da_indx] = physmap[0];
2044 * Get dcons buffer address
2046 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
2047 getenv_quad("dcons.size", &dcons_size) == 0)
2051 * physmap is in bytes, so when converting to page boundaries,
2052 * round up the start address and round down the end address.
2054 for (i = 0; i <= physmap_idx; i += 2) {
2057 end = ptoa((vm_paddr_t)Maxmem);
2058 if (physmap[i + 1] < end)
2059 end = trunc_page(physmap[i + 1]);
2060 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
2061 int tmp, page_bad, full;
2066 * block out kernel memory as not available.
2068 if (pa >= KERNLOAD && pa < first)
2072 * block out dcons buffer
2075 && pa >= trunc_page(dcons_addr)
2076 && pa < dcons_addr + dcons_size)
2084 * map page into kernel: valid, read/write,non-cacheable
2086 ptr = (int *)pmap_cmap3(pa, PG_V | PG_RW | PG_N);
2090 * Test for alternating 1's and 0's
2092 *(volatile int *)ptr = 0xaaaaaaaa;
2093 if (*(volatile int *)ptr != 0xaaaaaaaa)
2096 * Test for alternating 0's and 1's
2098 *(volatile int *)ptr = 0x55555555;
2099 if (*(volatile int *)ptr != 0x55555555)
2104 *(volatile int *)ptr = 0xffffffff;
2105 if (*(volatile int *)ptr != 0xffffffff)
2110 *(volatile int *)ptr = 0x0;
2111 if (*(volatile int *)ptr != 0x0)
2114 * Restore original value.
2120 * Adjust array of valid/good pages.
2122 if (page_bad == TRUE)
2125 * If this good page is a continuation of the
2126 * previous set of good pages, then just increase
2127 * the end pointer. Otherwise start a new chunk.
2128 * Note that "end" points one higher than end,
2129 * making the range >= start and < end.
2130 * If we're also doing a speculative memory
2131 * test and we at or past the end, bump up Maxmem
2132 * so that we keep going. The first bad page
2133 * will terminate the loop.
2135 if (phys_avail[pa_indx] == pa) {
2136 phys_avail[pa_indx] += PAGE_SIZE;
2139 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
2141 "Too many holes in the physical address space, giving up\n");
2146 phys_avail[pa_indx++] = pa; /* start */
2147 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
2151 if (dump_avail[da_indx] == pa) {
2152 dump_avail[da_indx] += PAGE_SIZE;
2155 if (da_indx == DUMP_AVAIL_ARRAY_END) {
2159 dump_avail[da_indx++] = pa; /* start */
2160 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
2171 * The last chunk must contain at least one page plus the message
2172 * buffer to avoid complicating other code (message buffer address
2173 * calculation, etc.).
2175 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
2176 round_page(msgbufsize) >= phys_avail[pa_indx]) {
2177 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
2178 phys_avail[pa_indx--] = 0;
2179 phys_avail[pa_indx--] = 0;
2182 Maxmem = atop(phys_avail[pa_indx]);
2184 /* Trim off space for the message buffer. */
2185 phys_avail[pa_indx] -= round_page(msgbufsize);
2187 /* Map the message buffer. */
2188 for (off = 0; off < round_page(msgbufsize); off += PAGE_SIZE)
2189 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
2197 db_fetch_ksymtab(bootinfo.bi_symtab, bootinfo.bi_esymtab);
2201 if (boothowto & RB_KDB)
2202 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
2209 struct gate_descriptor *ip;
2213 for (x = 0; x < NIDT; x++) {
2215 if (ip->gd_type != SDT_SYS386IGT &&
2216 ip->gd_type != SDT_SYS386TGT)
2218 off = ip->gd_looffset + (((u_int)ip->gd_hioffset) << 16);
2219 KASSERT(off >= (uintptr_t)start_exceptions &&
2220 off < (uintptr_t)end_exceptions,
2221 ("IDT[%d] type %d off %#x", x, ip->gd_type, off));
2223 MPASS(off >= PMAP_TRM_MIN_ADDRESS &&
2224 off < PMAP_TRM_MAX_ADDRESS);
2225 ip->gd_looffset = off;
2226 ip->gd_hioffset = off >> 16;
2236 for (x = 0; x < NIDT; x++)
2237 setidt(x, &IDTVEC(rsvd), SDT_SYS386IGT, SEL_KPL,
2238 GSEL(GCODE_SEL, SEL_KPL));
2239 setidt(IDT_DE, &IDTVEC(div), SDT_SYS386IGT, SEL_KPL,
2240 GSEL(GCODE_SEL, SEL_KPL));
2241 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL,
2242 GSEL(GCODE_SEL, SEL_KPL));
2243 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYS386IGT, SEL_KPL,
2244 GSEL(GCODE_SEL, SEL_KPL));
2245 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL,
2246 GSEL(GCODE_SEL, SEL_KPL));
2247 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYS386IGT, SEL_UPL,
2248 GSEL(GCODE_SEL, SEL_KPL));
2249 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYS386IGT, SEL_KPL,
2250 GSEL(GCODE_SEL, SEL_KPL));
2251 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL,
2252 GSEL(GCODE_SEL, SEL_KPL));
2253 setidt(IDT_NM, &IDTVEC(dna), SDT_SYS386IGT, SEL_KPL,
2254 GSEL(GCODE_SEL, SEL_KPL));
2255 setidt(IDT_DF, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL,
2257 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYS386IGT,
2258 SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2259 setidt(IDT_TS, &IDTVEC(tss), SDT_SYS386IGT, SEL_KPL,
2260 GSEL(GCODE_SEL, SEL_KPL));
2261 setidt(IDT_NP, &IDTVEC(missing), SDT_SYS386IGT, SEL_KPL,
2262 GSEL(GCODE_SEL, SEL_KPL));
2263 setidt(IDT_SS, &IDTVEC(stk), SDT_SYS386IGT, SEL_KPL,
2264 GSEL(GCODE_SEL, SEL_KPL));
2265 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL,
2266 GSEL(GCODE_SEL, SEL_KPL));
2267 setidt(IDT_PF, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL,
2268 GSEL(GCODE_SEL, SEL_KPL));
2269 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYS386IGT, SEL_KPL,
2270 GSEL(GCODE_SEL, SEL_KPL));
2271 setidt(IDT_AC, &IDTVEC(align), SDT_SYS386IGT, SEL_KPL,
2272 GSEL(GCODE_SEL, SEL_KPL));
2273 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYS386IGT, SEL_KPL,
2274 GSEL(GCODE_SEL, SEL_KPL));
2275 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYS386IGT, SEL_KPL,
2276 GSEL(GCODE_SEL, SEL_KPL));
2277 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall),
2278 SDT_SYS386IGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2279 #ifdef KDTRACE_HOOKS
2280 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret),
2281 SDT_SYS386IGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
2284 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall),
2285 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2293 setidt(IDT_UD, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL,
2294 GSEL(GCODE_SEL, SEL_KPL));
2295 setidt(IDT_GP, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL,
2296 GSEL(GCODE_SEL, SEL_KPL));
2299 #if defined(DEV_ISA) && !defined(DEV_ATPIC)
2304 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint),
2305 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2306 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint),
2307 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2314 struct region_descriptor r_gdt, r_idt; /* table descriptors */
2315 int gsel_tss, metadata_missing, x, pa;
2317 struct xstate_hdr *xhdr;
2323 thread0.td_kstack = proc0kstack;
2324 thread0.td_kstack_pages = TD0_KSTACK_PAGES;
2327 * This may be done better later if it gets more high level
2328 * components in it. If so just link td->td_proc here.
2330 proc_linkup0(&proc0, &thread0);
2332 if (bootinfo.bi_modulep) {
2333 metadata_missing = 0;
2334 addend = (vm_paddr_t)bootinfo.bi_modulep < KERNBASE ?
2336 preload_metadata = (caddr_t)bootinfo.bi_modulep + addend;
2337 preload_bootstrap_relocate(addend);
2339 metadata_missing = 1;
2342 if (bootinfo.bi_envp != 0) {
2343 addend = (vm_paddr_t)bootinfo.bi_envp < KERNBASE ?
2345 init_static_kenv((char *)bootinfo.bi_envp + addend, 0);
2347 init_static_kenv(NULL, 0);
2351 * Re-evaluate CPU features if we loaded a microcode update.
2353 ucode_len = ucode_load_bsp(first);
2354 if (ucode_len != 0) {
2356 first = roundup2(first + ucode_len, PAGE_SIZE);
2359 identify_hypervisor();
2361 /* Init basic tunables, hz etc */
2365 * Make gdt memory segments. All segments cover the full 4GB
2366 * of address space and permissions are enforced at page level.
2368 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
2369 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
2370 gdt_segs[GUCODE_SEL].ssd_limit = atop(0 - 1);
2371 gdt_segs[GUDATA_SEL].ssd_limit = atop(0 - 1);
2372 gdt_segs[GUFS_SEL].ssd_limit = atop(0 - 1);
2373 gdt_segs[GUGS_SEL].ssd_limit = atop(0 - 1);
2376 gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1);
2377 gdt_segs[GPRIV_SEL].ssd_base = (int)pc;
2378 gdt_segs[GPROC0_SEL].ssd_base = (int)&common_tss0;
2380 for (x = 0; x < NGDT; x++)
2381 ssdtosd(&gdt_segs[x], &gdt0[x].sd);
2383 r_gdt.rd_limit = NGDT * sizeof(gdt0[0]) - 1;
2384 r_gdt.rd_base = (int)gdt0;
2385 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_SPIN);
2388 pcpu_init(pc, 0, sizeof(struct pcpu));
2389 for (pa = first; pa < first + DPCPU_SIZE; pa += PAGE_SIZE)
2390 pmap_kenter(pa, pa);
2391 dpcpu_init((void *)first, 0);
2392 first += DPCPU_SIZE;
2393 PCPU_SET(prvspace, pc);
2394 PCPU_SET(curthread, &thread0);
2395 /* Non-late cninit() and printf() can be moved up to here. */
2398 * Initialize mutexes.
2400 * icu_lock: in order to allow an interrupt to occur in a critical
2401 * section, to set pcpu->ipending (etc...) properly, we
2402 * must be able to get the icu lock, so it can't be
2406 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS | MTX_NOPROFILE);
2410 r_idt.rd_limit = sizeof(idt0) - 1;
2411 r_idt.rd_base = (int) idt;
2415 * Initialize the clock before the console so that console
2416 * initialization can use DELAY().
2420 finishidentcpu(); /* Final stage of CPU initialization */
2423 initializecpu(); /* Initialize CPU registers */
2424 initializecpucache();
2426 /* pointer to selector slot for %fs/%gs */
2427 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd);
2429 /* Initialize the tss (except for the final esp0) early for vm86. */
2430 common_tss0.tss_esp0 = thread0.td_kstack + thread0.td_kstack_pages *
2431 PAGE_SIZE - VM86_STACK_SPACE;
2432 common_tss0.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
2433 common_tss0.tss_ioopt = sizeof(struct i386tss) << 16;
2434 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2435 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd);
2436 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
2439 /* Initialize the PIC early for vm86 calls. */
2445 /* Reset and mask the atpics and leave them shut down. */
2449 * Point the ICU spurious interrupt vectors at the APIC spurious
2450 * interrupt handler.
2457 * The console and kdb should be initialized even earlier than here,
2458 * but some console drivers don't work until after getmemsize().
2459 * Default to late console initialization to support these drivers.
2460 * This loses mainly printf()s in getmemsize() and early debugging.
2463 TUNABLE_INT_FETCH("debug.late_console", &late_console);
2464 if (!late_console) {
2469 kmdp = preload_search_by_type("elf kernel");
2470 link_elf_ireloc(kmdp);
2474 init_param2(physmem);
2476 /* now running on new page tables, configured,and u/iom is accessible */
2481 if (metadata_missing)
2482 printf("WARNING: loader(8) metadata is missing!\n");
2487 msgbufinit(msgbufp, msgbufsize);
2490 * Set up thread0 pcb after npxinit calculated pcb + fpu save
2491 * area size. Zero out the extended state header in fpu save
2494 thread0.td_pcb = get_pcb_td(&thread0);
2495 thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
2496 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
2498 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
2500 xhdr->xstate_bv = xsave_mask;
2502 PCPU_SET(curpcb, thread0.td_pcb);
2503 /* Move esp0 in the tss to its final place. */
2504 /* Note: -16 is so we can grow the trapframe if we came from vm86 */
2505 common_tss0.tss_esp0 = (vm_offset_t)thread0.td_pcb - VM86_STACK_SPACE;
2506 PCPU_SET(kesp0, common_tss0.tss_esp0);
2507 gdt[GPROC0_SEL].sd.sd_type = SDT_SYS386TSS; /* clear busy bit */
2510 /* transfer to user mode */
2512 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
2513 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
2515 /* setup proc 0's pcb */
2516 thread0.td_pcb->pcb_flags = 0;
2517 thread0.td_pcb->pcb_cr3 = pmap_get_kcr3();
2518 thread0.td_pcb->pcb_ext = 0;
2519 thread0.td_frame = &proc0_tf;
2527 /* Location of kernel stack for locore */
2528 return ((register_t)thread0.td_pcb);
2532 machdep_init_trampoline(void)
2534 struct region_descriptor r_gdt, r_idt;
2535 struct i386tss *tss;
2536 char *copyout_buf, *trampoline, *tramp_stack_base;
2539 gdt = pmap_trm_alloc(sizeof(union descriptor) * NGDT * mp_ncpus,
2541 bcopy(gdt0, gdt, sizeof(union descriptor) * NGDT);
2542 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
2543 r_gdt.rd_base = (int)gdt;
2546 tss = pmap_trm_alloc(sizeof(struct i386tss) * mp_ncpus,
2548 bcopy(&common_tss0, tss, sizeof(struct i386tss));
2549 gdt[GPROC0_SEL].sd.sd_lobase = (int)tss;
2550 gdt[GPROC0_SEL].sd.sd_hibase = (u_int)tss >> 24;
2551 gdt[GPROC0_SEL].sd.sd_type = SDT_SYS386TSS;
2553 PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd);
2554 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd);
2555 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
2556 PCPU_SET(common_tssp, tss);
2557 ltr(GSEL(GPROC0_SEL, SEL_KPL));
2559 trampoline = pmap_trm_alloc(end_exceptions - start_exceptions,
2561 bcopy(start_exceptions, trampoline, end_exceptions - start_exceptions);
2562 tramp_stack_base = pmap_trm_alloc(TRAMP_STACK_SZ, M_NOWAIT);
2563 PCPU_SET(trampstk, (uintptr_t)tramp_stack_base + TRAMP_STACK_SZ -
2565 tss[0].tss_esp0 = PCPU_GET(trampstk);
2567 idt = pmap_trm_alloc(sizeof(idt0), M_NOWAIT | M_ZERO);
2568 bcopy(idt0, idt, sizeof(idt0));
2570 /* Re-initialize new IDT since the handlers were relocated */
2571 setidt_disp = trampoline - start_exceptions;
2574 r_idt.rd_limit = sizeof(struct gate_descriptor) * NIDT - 1;
2575 r_idt.rd_base = (int)idt;
2579 dblfault_tss = pmap_trm_alloc(sizeof(struct i386tss), M_NOWAIT | M_ZERO);
2580 dblfault_stack = pmap_trm_alloc(PAGE_SIZE, M_NOWAIT);
2581 dblfault_tss->tss_esp = dblfault_tss->tss_esp0 =
2582 dblfault_tss->tss_esp1 = dblfault_tss->tss_esp2 =
2583 (int)dblfault_stack + PAGE_SIZE;
2584 dblfault_tss->tss_ss = dblfault_tss->tss_ss0 = dblfault_tss->tss_ss1 =
2585 dblfault_tss->tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2586 dblfault_tss->tss_cr3 = pmap_get_kcr3();
2587 dblfault_tss->tss_eip = (int)dblfault_handler;
2588 dblfault_tss->tss_eflags = PSL_KERNEL;
2589 dblfault_tss->tss_ds = dblfault_tss->tss_es =
2590 dblfault_tss->tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2591 dblfault_tss->tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2592 dblfault_tss->tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2593 dblfault_tss->tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2594 gdt[GPANIC_SEL].sd.sd_lobase = (int)dblfault_tss;
2595 gdt[GPANIC_SEL].sd.sd_hibase = (u_int)dblfault_tss >> 24;
2597 /* make ldt memory segments */
2598 ldt = pmap_trm_alloc(sizeof(union descriptor) * NLDT,
2600 gdt[GLDT_SEL].sd.sd_lobase = (int)ldt;
2601 gdt[GLDT_SEL].sd.sd_hibase = (u_int)ldt >> 24;
2602 ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1);
2603 ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1);
2604 for (x = 0; x < nitems(ldt_segs); x++)
2605 ssdtosd(&ldt_segs[x], &ldt[x].sd);
2607 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
2609 PCPU_SET(currentldt, _default_ldt);
2611 copyout_buf = pmap_trm_alloc(TRAMP_COPYOUT_SZ, M_NOWAIT);
2612 PCPU_SET(copyout_buf, copyout_buf);
2613 copyout_init_tramp();
2615 SYSINIT(vm_mem, SI_SUB_VM, SI_ORDER_SECOND, machdep_init_trampoline, NULL);
2619 i386_setup_lcall_gate(void)
2621 struct sysentvec *sv;
2622 struct user_segment_descriptor desc;
2625 sv = &elf32_freebsd_sysvec;
2626 lcall_addr = (uintptr_t)sv->sv_psstrings - sz_lcall_tramp;
2628 bzero(&desc, sizeof(desc));
2629 desc.sd_type = SDT_MEMERA;
2630 desc.sd_dpl = SEL_UPL;
2634 desc.sd_lolimit = 0xffff;
2635 desc.sd_hilimit = 0xf;
2636 desc.sd_lobase = lcall_addr;
2637 desc.sd_hibase = lcall_addr >> 24;
2638 bcopy(&desc, &ldt[LSYS5CALLS_SEL], sizeof(desc));
2640 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, i386_setup_lcall_gate, NULL);
2644 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
2647 pcpu->pc_acpi_id = 0xffffffff;
2651 smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
2653 struct bios_smap *smapbase;
2654 struct bios_smap_xattr smap;
2657 int count, error, i;
2659 /* Retrieve the system memory map from the loader. */
2660 kmdp = preload_search_by_type("elf kernel");
2662 kmdp = preload_search_by_type("elf32 kernel");
2663 smapbase = (struct bios_smap *)preload_search_info(kmdp,
2664 MODINFO_METADATA | MODINFOMD_SMAP);
2665 if (smapbase == NULL)
2667 smapattr = (uint32_t *)preload_search_info(kmdp,
2668 MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
2669 count = *((u_int32_t *)smapbase - 1) / sizeof(*smapbase);
2671 for (i = 0; i < count; i++) {
2672 smap.base = smapbase[i].base;
2673 smap.length = smapbase[i].length;
2674 smap.type = smapbase[i].type;
2675 if (smapattr != NULL)
2676 smap.xattr = smapattr[i];
2679 error = SYSCTL_OUT(req, &smap, sizeof(smap));
2683 SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
2684 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
2687 spinlock_enter(void)
2693 if (td->td_md.md_spinlock_count == 0) {
2694 flags = intr_disable();
2695 td->td_md.md_spinlock_count = 1;
2696 td->td_md.md_saved_flags = flags;
2698 td->td_md.md_spinlock_count++;
2710 flags = td->td_md.md_saved_flags;
2711 td->td_md.md_spinlock_count--;
2712 if (td->td_md.md_spinlock_count == 0)
2713 intr_restore(flags);
2716 #if defined(I586_CPU) && !defined(NO_F00F_HACK)
2717 static void f00f_hack(void *unused);
2718 SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2721 f00f_hack(void *unused)
2723 struct region_descriptor r_idt;
2724 struct gate_descriptor *new_idt;
2732 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2734 tmp = (vm_offset_t)pmap_trm_alloc(PAGE_SIZE * 3, M_NOWAIT | M_ZERO);
2736 panic("kmem_malloc returned 0");
2737 tmp = round_page(tmp);
2739 /* Put the problematic entry (#6) at the end of the lower page. */
2740 new_idt = (struct gate_descriptor *)
2741 (tmp + PAGE_SIZE - 7 * sizeof(struct gate_descriptor));
2742 bcopy(idt, new_idt, sizeof(idt0));
2743 r_idt.rd_base = (u_int)new_idt;
2744 r_idt.rd_limit = sizeof(idt0) - 1;
2746 /* SMP machines do not need the F00F hack. */
2748 pmap_protect(kernel_pmap, tmp, tmp + PAGE_SIZE, VM_PROT_READ);
2750 #endif /* defined(I586_CPU) && !NO_F00F_HACK */
2753 * Construct a PCB from a trapframe. This is called from kdb_trap() where
2754 * we want to start a backtrace from the function that caused us to enter
2755 * the debugger. We have the context in the trapframe, but base the trace
2756 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
2757 * enough for a backtrace.
2760 makectx(struct trapframe *tf, struct pcb *pcb)
2763 pcb->pcb_edi = tf->tf_edi;
2764 pcb->pcb_esi = tf->tf_esi;
2765 pcb->pcb_ebp = tf->tf_ebp;
2766 pcb->pcb_ebx = tf->tf_ebx;
2767 pcb->pcb_eip = tf->tf_eip;
2768 pcb->pcb_esp = (ISPL(tf->tf_cs)) ? tf->tf_esp : (int)(tf + 1) - 8;
2769 pcb->pcb_gs = rgs();
2773 ptrace_set_pc(struct thread *td, u_long addr)
2776 td->td_frame->tf_eip = addr;
2781 ptrace_single_step(struct thread *td)
2784 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
2785 if ((td->td_frame->tf_eflags & PSL_T) == 0) {
2786 td->td_frame->tf_eflags |= PSL_T;
2787 td->td_dbgflags |= TDB_STEP;
2793 ptrace_clear_single_step(struct thread *td)
2796 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
2797 td->td_frame->tf_eflags &= ~PSL_T;
2798 td->td_dbgflags &= ~TDB_STEP;
2803 fill_regs(struct thread *td, struct reg *regs)
2806 struct trapframe *tp;
2810 regs->r_gs = pcb->pcb_gs;
2811 return (fill_frame_regs(tp, regs));
2815 fill_frame_regs(struct trapframe *tp, struct reg *regs)
2818 regs->r_fs = tp->tf_fs;
2819 regs->r_es = tp->tf_es;
2820 regs->r_ds = tp->tf_ds;
2821 regs->r_edi = tp->tf_edi;
2822 regs->r_esi = tp->tf_esi;
2823 regs->r_ebp = tp->tf_ebp;
2824 regs->r_ebx = tp->tf_ebx;
2825 regs->r_edx = tp->tf_edx;
2826 regs->r_ecx = tp->tf_ecx;
2827 regs->r_eax = tp->tf_eax;
2828 regs->r_eip = tp->tf_eip;
2829 regs->r_cs = tp->tf_cs;
2830 regs->r_eflags = tp->tf_eflags;
2831 regs->r_esp = tp->tf_esp;
2832 regs->r_ss = tp->tf_ss;
2839 set_regs(struct thread *td, struct reg *regs)
2842 struct trapframe *tp;
2845 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2846 !CS_SECURE(regs->r_cs))
2849 tp->tf_fs = regs->r_fs;
2850 tp->tf_es = regs->r_es;
2851 tp->tf_ds = regs->r_ds;
2852 tp->tf_edi = regs->r_edi;
2853 tp->tf_esi = regs->r_esi;
2854 tp->tf_ebp = regs->r_ebp;
2855 tp->tf_ebx = regs->r_ebx;
2856 tp->tf_edx = regs->r_edx;
2857 tp->tf_ecx = regs->r_ecx;
2858 tp->tf_eax = regs->r_eax;
2859 tp->tf_eip = regs->r_eip;
2860 tp->tf_cs = regs->r_cs;
2861 tp->tf_eflags = regs->r_eflags;
2862 tp->tf_esp = regs->r_esp;
2863 tp->tf_ss = regs->r_ss;
2864 pcb->pcb_gs = regs->r_gs;
2869 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2872 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2873 P_SHOULDSTOP(td->td_proc),
2874 ("not suspended thread %p", td));
2877 npx_fill_fpregs_xmm(&get_pcb_user_save_td(td)->sv_xmm,
2878 (struct save87 *)fpregs);
2880 bcopy(&get_pcb_user_save_td(td)->sv_87, fpregs,
2886 set_fpregs(struct thread *td, struct fpreg *fpregs)
2891 npx_set_fpregs_xmm((struct save87 *)fpregs,
2892 &get_pcb_user_save_td(td)->sv_xmm);
2894 bcopy(fpregs, &get_pcb_user_save_td(td)->sv_87,
2902 * Get machine context.
2905 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2907 struct trapframe *tp;
2908 struct segment_descriptor *sdp;
2912 PROC_LOCK(curthread->td_proc);
2913 mcp->mc_onstack = sigonstack(tp->tf_esp);
2914 PROC_UNLOCK(curthread->td_proc);
2915 mcp->mc_gs = td->td_pcb->pcb_gs;
2916 mcp->mc_fs = tp->tf_fs;
2917 mcp->mc_es = tp->tf_es;
2918 mcp->mc_ds = tp->tf_ds;
2919 mcp->mc_edi = tp->tf_edi;
2920 mcp->mc_esi = tp->tf_esi;
2921 mcp->mc_ebp = tp->tf_ebp;
2922 mcp->mc_isp = tp->tf_isp;
2923 mcp->mc_eflags = tp->tf_eflags;
2924 if (flags & GET_MC_CLEAR_RET) {
2927 mcp->mc_eflags &= ~PSL_C;
2929 mcp->mc_eax = tp->tf_eax;
2930 mcp->mc_edx = tp->tf_edx;
2932 mcp->mc_ebx = tp->tf_ebx;
2933 mcp->mc_ecx = tp->tf_ecx;
2934 mcp->mc_eip = tp->tf_eip;
2935 mcp->mc_cs = tp->tf_cs;
2936 mcp->mc_esp = tp->tf_esp;
2937 mcp->mc_ss = tp->tf_ss;
2938 mcp->mc_len = sizeof(*mcp);
2939 get_fpcontext(td, mcp, NULL, 0);
2940 sdp = &td->td_pcb->pcb_fsd;
2941 mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
2942 sdp = &td->td_pcb->pcb_gsd;
2943 mcp->mc_gsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
2945 mcp->mc_xfpustate = 0;
2946 mcp->mc_xfpustate_len = 0;
2947 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
2952 * Set machine context.
2954 * However, we don't set any but the user modifiable flags, and we won't
2955 * touch the cs selector.
2958 set_mcontext(struct thread *td, mcontext_t *mcp)
2960 struct trapframe *tp;
2965 if (mcp->mc_len != sizeof(*mcp) ||
2966 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2968 eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
2969 (tp->tf_eflags & ~PSL_USERCHANGE);
2970 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2971 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2972 sizeof(union savefpu))
2974 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2975 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2976 mcp->mc_xfpustate_len);
2981 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2984 tp->tf_fs = mcp->mc_fs;
2985 tp->tf_es = mcp->mc_es;
2986 tp->tf_ds = mcp->mc_ds;
2987 tp->tf_edi = mcp->mc_edi;
2988 tp->tf_esi = mcp->mc_esi;
2989 tp->tf_ebp = mcp->mc_ebp;
2990 tp->tf_ebx = mcp->mc_ebx;
2991 tp->tf_edx = mcp->mc_edx;
2992 tp->tf_ecx = mcp->mc_ecx;
2993 tp->tf_eax = mcp->mc_eax;
2994 tp->tf_eip = mcp->mc_eip;
2995 tp->tf_eflags = eflags;
2996 tp->tf_esp = mcp->mc_esp;
2997 tp->tf_ss = mcp->mc_ss;
2998 td->td_pcb->pcb_gs = mcp->mc_gs;
3003 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
3004 size_t xfpusave_len)
3006 size_t max_len, len;
3008 mcp->mc_ownedfp = npxgetregs(td);
3009 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
3010 sizeof(mcp->mc_fpstate));
3011 mcp->mc_fpformat = npxformat();
3012 if (!use_xsave || xfpusave_len == 0)
3014 max_len = cpu_max_ext_state_size - sizeof(union savefpu);
3016 if (len > max_len) {
3018 bzero(xfpusave + max_len, len - max_len);
3020 mcp->mc_flags |= _MC_HASFPXSTATE;
3021 mcp->mc_xfpustate_len = len;
3022 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
3026 set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate,
3027 size_t xfpustate_len)
3031 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
3033 else if (mcp->mc_fpformat != _MC_FPFMT_387 &&
3034 mcp->mc_fpformat != _MC_FPFMT_XMM)
3036 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
3037 /* We don't care what state is left in the FPU or PCB. */
3040 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
3041 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
3042 error = npxsetregs(td, (union savefpu *)&mcp->mc_fpstate,
3043 xfpustate, xfpustate_len);
3050 fpstate_drop(struct thread *td)
3053 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
3055 if (PCPU_GET(fpcurthread) == td)
3058 * XXX force a full drop of the npx. The above only drops it if we
3059 * owned it. npxgetregs() has the same bug in the !cpu_fxsr case.
3061 * XXX I don't much like npxgetregs()'s semantics of doing a full
3062 * drop. Dropping only to the pcb matches fnsave's behaviour.
3063 * We only need to drop to !PCB_INITDONE in sendsig(). But
3064 * sendsig() is the only caller of npxgetregs()... perhaps we just
3065 * have too many layers.
3067 curthread->td_pcb->pcb_flags &= ~(PCB_NPXINITDONE |
3068 PCB_NPXUSERINITDONE);
3073 fill_dbregs(struct thread *td, struct dbreg *dbregs)
3078 dbregs->dr[0] = rdr0();
3079 dbregs->dr[1] = rdr1();
3080 dbregs->dr[2] = rdr2();
3081 dbregs->dr[3] = rdr3();
3082 dbregs->dr[6] = rdr6();
3083 dbregs->dr[7] = rdr7();
3086 dbregs->dr[0] = pcb->pcb_dr0;
3087 dbregs->dr[1] = pcb->pcb_dr1;
3088 dbregs->dr[2] = pcb->pcb_dr2;
3089 dbregs->dr[3] = pcb->pcb_dr3;
3090 dbregs->dr[6] = pcb->pcb_dr6;
3091 dbregs->dr[7] = pcb->pcb_dr7;
3099 set_dbregs(struct thread *td, struct dbreg *dbregs)
3105 load_dr0(dbregs->dr[0]);
3106 load_dr1(dbregs->dr[1]);
3107 load_dr2(dbregs->dr[2]);
3108 load_dr3(dbregs->dr[3]);
3109 load_dr6(dbregs->dr[6]);
3110 load_dr7(dbregs->dr[7]);
3113 * Don't let an illegal value for dr7 get set. Specifically,
3114 * check for undefined settings. Setting these bit patterns
3115 * result in undefined behaviour and can lead to an unexpected
3118 for (i = 0; i < 4; i++) {
3119 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
3121 if (DBREG_DR7_LEN(dbregs->dr[7], i) == 0x02)
3128 * Don't let a process set a breakpoint that is not within the
3129 * process's address space. If a process could do this, it
3130 * could halt the system by setting a breakpoint in the kernel
3131 * (if ddb was enabled). Thus, we need to check to make sure
3132 * that no breakpoints are being enabled for addresses outside
3133 * process's address space.
3135 * XXX - what about when the watched area of the user's
3136 * address space is written into from within the kernel
3137 * ... wouldn't that still cause a breakpoint to be generated
3138 * from within kernel mode?
3141 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
3142 /* dr0 is enabled */
3143 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
3147 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
3148 /* dr1 is enabled */
3149 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
3153 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
3154 /* dr2 is enabled */
3155 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
3159 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
3160 /* dr3 is enabled */
3161 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
3165 pcb->pcb_dr0 = dbregs->dr[0];
3166 pcb->pcb_dr1 = dbregs->dr[1];
3167 pcb->pcb_dr2 = dbregs->dr[2];
3168 pcb->pcb_dr3 = dbregs->dr[3];
3169 pcb->pcb_dr6 = dbregs->dr[6];
3170 pcb->pcb_dr7 = dbregs->dr[7];
3172 pcb->pcb_flags |= PCB_DBREGS;
3179 * Return > 0 if a hardware breakpoint has been hit, and the
3180 * breakpoint was in user space. Return 0, otherwise.
3183 user_dbreg_trap(register_t dr6)
3186 u_int32_t bp; /* breakpoint bits extracted from dr6 */
3187 int nbp; /* number of breakpoints that triggered */
3188 caddr_t addr[4]; /* breakpoint addresses */
3191 bp = dr6 & DBREG_DR6_BMASK;
3194 * None of the breakpoint bits are set meaning this
3195 * trap was not caused by any of the debug registers
3201 if ((dr7 & 0x000000ff) == 0) {
3203 * all GE and LE bits in the dr7 register are zero,
3204 * thus the trap couldn't have been caused by the
3205 * hardware debug registers
3213 * at least one of the breakpoints were hit, check to see
3214 * which ones and if any of them are user space addresses
3218 addr[nbp++] = (caddr_t)rdr0();
3221 addr[nbp++] = (caddr_t)rdr1();
3224 addr[nbp++] = (caddr_t)rdr2();
3227 addr[nbp++] = (caddr_t)rdr3();
3230 for (i = 0; i < nbp; i++) {
3231 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
3233 * addr[i] is in user space
3240 * None of the breakpoints are in user space.
3248 * Provide inb() and outb() as functions. They are normally only available as
3249 * inline functions, thus cannot be called from the debugger.
3252 /* silence compiler warnings */
3253 u_char inb_(u_short);
3254 void outb_(u_short, u_char);
3263 outb_(u_short port, u_char data)