2 * Copyright (c) 2003 Peter Wemm.
3 * Copyright (c) 1992 Terrence R. Lambert.
4 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include "opt_atalk.h"
45 #include "opt_atpic.h"
46 #include "opt_compat.h"
52 #include "opt_kstack_pages.h"
53 #include "opt_maxmem.h"
54 #include "opt_mp_watchdog.h"
55 #include "opt_perfmon.h"
56 #include "opt_sched.h"
57 #include "opt_kdtrace.h"
59 #include <sys/param.h>
61 #include <sys/systm.h>
65 #include <sys/callout.h>
68 #include <sys/eventhandler.h>
70 #include <sys/imgact.h>
72 #include <sys/kernel.h>
74 #include <sys/linker.h>
76 #include <sys/malloc.h>
77 #include <sys/msgbuf.h>
78 #include <sys/mutex.h>
80 #include <sys/ptrace.h>
81 #include <sys/reboot.h>
82 #include <sys/sched.h>
83 #include <sys/signalvar.h>
87 #include <sys/syscallsubr.h>
88 #include <sys/sysctl.h>
89 #include <sys/sysent.h>
90 #include <sys/sysproto.h>
91 #include <sys/ucontext.h>
92 #include <sys/vmmeter.h>
95 #include <vm/vm_extern.h>
96 #include <vm/vm_kern.h>
97 #include <vm/vm_page.h>
98 #include <vm/vm_map.h>
99 #include <vm/vm_object.h>
100 #include <vm/vm_pager.h>
101 #include <vm/vm_param.h>
105 #error KDB must be enabled in order for DDB to work!
108 #include <ddb/db_sym.h>
111 #include <net/netisr.h>
113 #include <machine/clock.h>
114 #include <machine/cpu.h>
115 #include <machine/cputypes.h>
116 #include <machine/intr_machdep.h>
118 #include <machine/md_var.h>
119 #include <machine/metadata.h>
120 #include <machine/mp_watchdog.h>
121 #include <machine/pc/bios.h>
122 #include <machine/pcb.h>
123 #include <machine/proc.h>
124 #include <machine/reg.h>
125 #include <machine/sigframe.h>
126 #include <machine/specialreg.h>
128 #include <machine/perfmon.h>
130 #include <machine/tss.h>
132 #include <machine/smp.h>
136 #include <x86/isa/icu.h>
138 #include <machine/apicvar.h>
141 #include <isa/isareg.h>
144 /* Sanity check for __curthread() */
145 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
147 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
149 extern void printcpuinfo(void); /* XXX header file */
150 extern void identify_cpu(void);
151 extern void panicifcpuunsupported(void);
153 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
154 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
156 static void cpu_startup(void *);
157 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
158 char *xfpusave, size_t xfpusave_len);
159 static int set_fpcontext(struct thread *td, const mcontext_t *mcp,
160 char *xfpustate, size_t xfpustate_len);
161 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
164 * The file "conf/ldscript.amd64" defines the symbol "kernphys". Its value is
165 * the physical address at which the kernel is loaded.
167 extern char kernphys[];
169 extern vm_offset_t ksym_start, ksym_end;
172 struct msgbuf *msgbufp;
174 /* Intel ICH registers */
175 #define ICH_PMBASE 0x400
176 #define ICH_SMI_EN ICH_PMBASE + 0x30
178 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
186 * The number of PHYSMAP entries must be one less than the number of
187 * PHYSSEG entries because the PHYSMAP entry that spans the largest
188 * physical address that is accessible by ISA DMA is split into two
191 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
193 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
194 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
196 /* must be 2 less so 0 0 can signal end of chunks */
197 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
198 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
200 struct kva_md_info kmi;
202 static struct trapframe proc0_tf;
203 struct region_descriptor r_gdt, r_idt;
205 struct pcpu __pcpu[MAXCPU];
209 struct mtx dt_lock; /* lock for GDT and LDT */
219 * On MacBooks, we need to disallow the legacy USB circuit to
220 * generate an SMI# because this can cause several problems,
221 * namely: incorrect CPU frequency detection and failure to
223 * We do this by disabling a bit in the SMI_EN (SMI Control and
224 * Enable register) of the Intel ICH LPC Interface Bridge.
226 sysenv = getenv("smbios.system.product");
227 if (sysenv != NULL) {
228 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
229 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
230 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
231 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
232 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
233 strncmp(sysenv, "Macmini1,1", 10) == 0) {
235 printf("Disabling LEGACY_USB_EN bit on "
237 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
243 * Good {morning,afternoon,evening,night}.
247 panicifcpuunsupported();
254 * Display physical memory if SMBIOS reports reasonable amount.
257 sysenv = getenv("smbios.memory.enabled");
258 if (sysenv != NULL) {
259 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
262 if (memsize < ptoa((uintmax_t)cnt.v_free_count))
263 memsize = ptoa((uintmax_t)Maxmem);
264 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
267 * Display any holes after the first chunk of extended memory.
272 printf("Physical memory chunk(s):\n");
273 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
276 size = phys_avail[indx + 1] - phys_avail[indx];
278 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
279 (uintmax_t)phys_avail[indx],
280 (uintmax_t)phys_avail[indx + 1] - 1,
281 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
285 vm_ksubmap_init(&kmi);
287 printf("avail memory = %ju (%ju MB)\n",
288 ptoa((uintmax_t)cnt.v_free_count),
289 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
292 * Set up buffers, so they can be used to read disk labels.
295 vm_pager_bufferinit();
301 * Send an interrupt to process.
303 * Stack is set up to allow sigcode stored
304 * at top to call routine, followed by call
305 * to sigreturn routine below. After sigreturn
306 * resets the signal mask, the stack, and the
307 * frame pointer, it returns to the user
311 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
313 struct sigframe sf, *sfp;
319 struct trapframe *regs;
328 PROC_LOCK_ASSERT(p, MA_OWNED);
329 sig = ksi->ksi_signo;
331 mtx_assert(&psp->ps_mtx, MA_OWNED);
333 oonstack = sigonstack(regs->tf_rsp);
335 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
336 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
337 xfpusave = __builtin_alloca(xfpusave_len);
343 /* Save user context. */
344 bzero(&sf, sizeof(sf));
345 sf.sf_uc.uc_sigmask = *mask;
346 sf.sf_uc.uc_stack = td->td_sigstk;
347 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
348 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
349 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
350 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
351 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
352 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
354 sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase;
355 sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase;
356 bzero(sf.sf_uc.uc_mcontext.mc_spare,
357 sizeof(sf.sf_uc.uc_mcontext.mc_spare));
358 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
360 /* Allocate space for the signal handler context. */
361 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
362 SIGISMEMBER(psp->ps_sigonstack, sig)) {
363 sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
364 #if defined(COMPAT_43)
365 td->td_sigstk.ss_flags |= SS_ONSTACK;
368 sp = (char *)regs->tf_rsp - 128;
369 if (xfpusave != NULL) {
371 sp = (char *)((unsigned long)sp & ~0x3Ful);
372 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
374 sp -= sizeof(struct sigframe);
375 /* Align to 16 bytes. */
376 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
378 /* Translate the signal if appropriate. */
379 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
380 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
382 /* Build the argument list for the signal handler. */
383 regs->tf_rdi = sig; /* arg 1 in %rdi */
384 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
385 bzero(&sf.sf_si, sizeof(sf.sf_si));
386 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
387 /* Signal handler installed with SA_SIGINFO. */
388 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
389 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
391 /* Fill in POSIX parts */
392 sf.sf_si = ksi->ksi_info;
393 sf.sf_si.si_signo = sig; /* maybe a translated signal */
394 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
396 /* Old FreeBSD-style arguments. */
397 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
398 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
399 sf.sf_ahu.sf_handler = catcher;
401 mtx_unlock(&psp->ps_mtx);
405 * Copy the sigframe out to the user's stack.
407 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
408 (xfpusave != NULL && copyout(xfpusave,
409 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
412 printf("process %ld has trashed its stack\n", (long)p->p_pid);
418 regs->tf_rsp = (long)sfp;
419 regs->tf_rip = p->p_sysent->sv_sigcode_base;
420 regs->tf_rflags &= ~(PSL_T | PSL_D);
421 regs->tf_cs = _ucodesel;
422 regs->tf_ds = _udatasel;
423 regs->tf_es = _udatasel;
424 regs->tf_fs = _ufssel;
425 regs->tf_gs = _ugssel;
426 regs->tf_flags = TF_HASSEGS;
427 set_pcb_flags(pcb, PCB_FULL_IRET);
429 mtx_lock(&psp->ps_mtx);
433 * System call to cleanup state after a signal
434 * has been taken. Reset signal mask and
435 * stack state from context left by sendsig (above).
436 * Return to previous pc and psl as specified by
437 * context left by sendsig. Check carefully to
438 * make sure that the user has not modified the
439 * state to gain improper privileges.
444 sys_sigreturn(td, uap)
446 struct sigreturn_args /* {
447 const struct __ucontext *sigcntxp;
453 struct trapframe *regs;
456 size_t xfpustate_len;
464 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
466 uprintf("pid %d (%s): sigreturn copyin failed\n",
467 p->p_pid, td->td_name);
471 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
472 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
473 td->td_name, ucp->uc_mcontext.mc_flags);
477 rflags = ucp->uc_mcontext.mc_rflags;
479 * Don't allow users to change privileged or reserved flags.
482 * XXX do allow users to change the privileged flag PSL_RF.
483 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
484 * should sometimes set it there too. tf_rflags is kept in
485 * the signal context during signal handling and there is no
486 * other place to remember it, so the PSL_RF bit may be
487 * corrupted by the signal handler without us knowing.
488 * Corruption of the PSL_RF bit at worst causes one more or
489 * one less debugger trap, so allowing it is fairly harmless.
491 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
492 uprintf("pid %d (%s): sigreturn rflags = 0x%lx\n", p->p_pid,
493 td->td_name, rflags);
498 * Don't allow users to load a valid privileged %cs. Let the
499 * hardware check for invalid selectors, excess privilege in
500 * other selectors, invalid %eip's and invalid %esp's.
502 cs = ucp->uc_mcontext.mc_cs;
503 if (!CS_SECURE(cs)) {
504 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", p->p_pid,
506 ksiginfo_init_trap(&ksi);
507 ksi.ksi_signo = SIGBUS;
508 ksi.ksi_code = BUS_OBJERR;
509 ksi.ksi_trapno = T_PROTFLT;
510 ksi.ksi_addr = (void *)regs->tf_rip;
511 trapsignal(td, &ksi);
515 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
516 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
517 if (xfpustate_len > cpu_max_ext_state_size -
518 sizeof(struct savefpu)) {
519 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
520 p->p_pid, td->td_name, xfpustate_len);
523 xfpustate = __builtin_alloca(xfpustate_len);
524 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate,
525 xfpustate, xfpustate_len);
528 "pid %d (%s): sigreturn copying xfpustate failed\n",
529 p->p_pid, td->td_name);
536 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate, xfpustate_len);
538 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
539 p->p_pid, td->td_name, ret);
542 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
543 pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase;
544 pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase;
546 #if defined(COMPAT_43)
547 if (ucp->uc_mcontext.mc_onstack & 1)
548 td->td_sigstk.ss_flags |= SS_ONSTACK;
550 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
553 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
554 set_pcb_flags(pcb, PCB_FULL_IRET);
555 return (EJUSTRETURN);
558 #ifdef COMPAT_FREEBSD4
560 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
563 return sys_sigreturn(td, (struct sigreturn_args *)uap);
569 * Machine dependent boot() routine
571 * I haven't seen anything to put here yet
572 * Possibly some stuff might be grafted back here from boot()
580 * Flush the D-cache for non-DMA I/O so that the I-cache can
581 * be made coherent later.
584 cpu_flush_dcache(void *ptr, size_t len)
589 /* Get current clock frequency for the given cpu id. */
591 cpu_est_clockrate(int cpu_id, uint64_t *rate)
594 uint64_t acnt, mcnt, perf;
597 if (pcpu_find(cpu_id) == NULL || rate == NULL)
601 * If TSC is P-state invariant and APERF/MPERF MSRs do not exist,
602 * DELAY(9) based logic fails.
604 if (tsc_is_invariant && !tsc_perf_stat)
609 /* Schedule ourselves on the indicated cpu. */
610 thread_lock(curthread);
611 sched_bind(curthread, cpu_id);
612 thread_unlock(curthread);
616 /* Calibrate by measuring a short delay. */
617 reg = intr_disable();
618 if (tsc_is_invariant) {
623 mcnt = rdmsr(MSR_MPERF);
624 acnt = rdmsr(MSR_APERF);
627 perf = 1000 * acnt / mcnt;
628 *rate = (tsc2 - tsc1) * perf;
634 *rate = (tsc2 - tsc1) * 1000;
639 thread_lock(curthread);
640 sched_unbind(curthread);
641 thread_unlock(curthread);
649 * Shutdown the CPU as much as possible
658 void (*cpu_idle_hook)(void) = NULL; /* ACPI idle hook. */
659 static int cpu_ident_amdc1e = 0; /* AMD C1E supported. */
660 static int idle_mwait = 1; /* Use MONITOR/MWAIT for short idle. */
661 TUNABLE_INT("machdep.idle_mwait", &idle_mwait);
662 SYSCTL_INT(_machdep, OID_AUTO, idle_mwait, CTLFLAG_RW, &idle_mwait,
663 0, "Use MONITOR/MWAIT for short idle");
665 #define STATE_RUNNING 0x0
666 #define STATE_MWAIT 0x1
667 #define STATE_SLEEPING 0x2
670 cpu_idle_acpi(int busy)
674 state = (int *)PCPU_PTR(monitorbuf);
675 *state = STATE_SLEEPING;
677 /* See comments in cpu_idle_hlt(). */
679 if (sched_runnable())
681 else if (cpu_idle_hook)
684 __asm __volatile("sti; hlt");
685 *state = STATE_RUNNING;
689 cpu_idle_hlt(int busy)
693 state = (int *)PCPU_PTR(monitorbuf);
694 *state = STATE_SLEEPING;
697 * Since we may be in a critical section from cpu_idle(), if
698 * an interrupt fires during that critical section we may have
699 * a pending preemption. If the CPU halts, then that thread
700 * may not execute until a later interrupt awakens the CPU.
701 * To handle this race, check for a runnable thread after
702 * disabling interrupts and immediately return if one is
703 * found. Also, we must absolutely guarentee that hlt is
704 * the next instruction after sti. This ensures that any
705 * interrupt that fires after the call to disable_intr() will
706 * immediately awaken the CPU from hlt. Finally, please note
707 * that on x86 this works fine because of interrupts enabled only
708 * after the instruction following sti takes place, while IF is set
709 * to 1 immediately, allowing hlt instruction to acknowledge the
713 if (sched_runnable())
716 __asm __volatile("sti; hlt");
717 *state = STATE_RUNNING;
721 * MWAIT cpu power states. Lower 4 bits are sub-states.
723 #define MWAIT_C0 0xf0
724 #define MWAIT_C1 0x00
725 #define MWAIT_C2 0x10
726 #define MWAIT_C3 0x20
727 #define MWAIT_C4 0x30
730 cpu_idle_mwait(int busy)
734 state = (int *)PCPU_PTR(monitorbuf);
735 *state = STATE_MWAIT;
737 /* See comments in cpu_idle_hlt(). */
739 if (sched_runnable()) {
741 *state = STATE_RUNNING;
744 cpu_monitor(state, 0, 0);
745 if (*state == STATE_MWAIT)
746 __asm __volatile("sti; mwait" : : "a" (MWAIT_C1), "c" (0));
749 *state = STATE_RUNNING;
753 cpu_idle_spin(int busy)
758 state = (int *)PCPU_PTR(monitorbuf);
759 *state = STATE_RUNNING;
762 * The sched_runnable() call is racy but as long as there is
763 * a loop missing it one time will have just a little impact if any
764 * (and it is much better than missing the check at all).
766 for (i = 0; i < 1000; i++) {
767 if (sched_runnable())
774 * C1E renders the local APIC timer dead, so we disable it by
775 * reading the Interrupt Pending Message register and clearing
776 * both C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
779 * "BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors"
780 * #32559 revision 3.00+
782 #define MSR_AMDK8_IPM 0xc0010055
783 #define AMDK8_SMIONCMPHALT (1ULL << 27)
784 #define AMDK8_C1EONCMPHALT (1ULL << 28)
785 #define AMDK8_CMPHALT (AMDK8_SMIONCMPHALT | AMDK8_C1EONCMPHALT)
788 cpu_probe_amdc1e(void)
792 * Detect the presence of C1E capability mostly on latest
793 * dual-cores (or future) k8 family.
795 if (cpu_vendor_id == CPU_VENDOR_AMD &&
796 (cpu_id & 0x00000f00) == 0x00000f00 &&
797 (cpu_id & 0x0fff0000) >= 0x00040000) {
798 cpu_ident_amdc1e = 1;
802 void (*cpu_idle_fn)(int) = cpu_idle_acpi;
809 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d",
812 ap_watchdog(PCPU_GET(cpuid));
814 /* If we are busy - try to use fast methods. */
816 if ((cpu_feature2 & CPUID2_MON) && idle_mwait) {
817 cpu_idle_mwait(busy);
822 /* If we have time - switch timers into idle mode. */
828 /* Apply AMD APIC timer C1E workaround. */
829 if (cpu_ident_amdc1e && cpu_disable_deep_sleep) {
830 msr = rdmsr(MSR_AMDK8_IPM);
831 if (msr & AMDK8_CMPHALT)
832 wrmsr(MSR_AMDK8_IPM, msr & ~AMDK8_CMPHALT);
835 /* Call main idle method. */
838 /* Switch timers mack into active mode. */
844 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done",
849 cpu_idle_wakeup(int cpu)
854 pcpu = pcpu_find(cpu);
855 state = (int *)pcpu->pc_monitorbuf;
857 * This doesn't need to be atomic since missing the race will
858 * simply result in unnecessary IPIs.
860 if (*state == STATE_SLEEPING)
862 if (*state == STATE_MWAIT)
863 *state = STATE_RUNNING;
868 * Ordered by speed/power consumption.
874 { cpu_idle_spin, "spin" },
875 { cpu_idle_mwait, "mwait" },
876 { cpu_idle_hlt, "hlt" },
877 { cpu_idle_acpi, "acpi" },
882 idle_sysctl_available(SYSCTL_HANDLER_ARGS)
888 avail = malloc(256, M_TEMP, M_WAITOK);
890 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
891 if (strstr(idle_tbl[i].id_name, "mwait") &&
892 (cpu_feature2 & CPUID2_MON) == 0)
894 if (strcmp(idle_tbl[i].id_name, "acpi") == 0 &&
895 cpu_idle_hook == NULL)
897 p += sprintf(p, "%s%s", p != avail ? ", " : "",
898 idle_tbl[i].id_name);
900 error = sysctl_handle_string(oidp, avail, 0, req);
905 SYSCTL_PROC(_machdep, OID_AUTO, idle_available, CTLTYPE_STRING | CTLFLAG_RD,
906 0, 0, idle_sysctl_available, "A", "list of available idle functions");
909 idle_sysctl(SYSCTL_HANDLER_ARGS)
917 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
918 if (idle_tbl[i].id_fn == cpu_idle_fn) {
919 p = idle_tbl[i].id_name;
923 strncpy(buf, p, sizeof(buf));
924 error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
925 if (error != 0 || req->newptr == NULL)
927 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
928 if (strstr(idle_tbl[i].id_name, "mwait") &&
929 (cpu_feature2 & CPUID2_MON) == 0)
931 if (strcmp(idle_tbl[i].id_name, "acpi") == 0 &&
932 cpu_idle_hook == NULL)
934 if (strcmp(idle_tbl[i].id_name, buf))
936 cpu_idle_fn = idle_tbl[i].id_fn;
942 SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
943 idle_sysctl, "A", "currently selected idle function");
946 * Reset registers to default values on exec.
949 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
951 struct trapframe *regs = td->td_frame;
952 struct pcb *pcb = td->td_pcb;
955 if (td->td_proc->p_md.md_ldt != NULL)
958 mtx_unlock(&dt_lock);
962 clear_pcb_flags(pcb, PCB_32BIT | PCB_GS32BIT);
963 pcb->pcb_initial_fpucw = __INITIAL_FPUCW__;
964 set_pcb_flags(pcb, PCB_FULL_IRET);
966 bzero((char *)regs, sizeof(struct trapframe));
967 regs->tf_rip = imgp->entry_addr;
968 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
969 regs->tf_rdi = stack; /* argv */
970 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
971 regs->tf_ss = _udatasel;
972 regs->tf_cs = _ucodesel;
973 regs->tf_ds = _udatasel;
974 regs->tf_es = _udatasel;
975 regs->tf_fs = _ufssel;
976 regs->tf_gs = _ugssel;
977 regs->tf_flags = TF_HASSEGS;
978 td->td_retval[1] = 0;
981 * Reset the hardware debug registers if they were in use.
982 * They won't have any meaning for the newly exec'd process.
984 if (pcb->pcb_flags & PCB_DBREGS) {
991 if (pcb == PCPU_GET(curpcb)) {
993 * Clear the debug registers on the running
994 * CPU, otherwise they will end up affecting
995 * the next process we switch to.
999 clear_pcb_flags(pcb, PCB_DBREGS);
1003 * Drop the FP state if we hold it, so that the process gets a
1004 * clean FP state if it uses the FPU again.
1016 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
1017 * BSP. See the comments there about why we set them.
1019 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
1024 * Initialize amd64 and configure to run kernel
1028 * Initialize segments & interrupt table
1031 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
1032 static struct gate_descriptor idt0[NIDT];
1033 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1035 static char dblfault_stack[PAGE_SIZE] __aligned(16);
1037 static char nmi0_stack[PAGE_SIZE] __aligned(16);
1038 CTASSERT(sizeof(struct nmi_pcpu) == 16);
1040 struct amd64tss common_tss[MAXCPU];
1043 * Software prototypes -- in more palatable form.
1045 * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same
1046 * slots as corresponding segments for i386 kernel.
1048 struct soft_segment_descriptor gdt_segs[] = {
1049 /* GNULL_SEL 0 Null Descriptor */
1058 /* GNULL2_SEL 1 Null Descriptor */
1067 /* GUFS32_SEL 2 32 bit %gs Descriptor for user */
1069 .ssd_limit = 0xfffff,
1070 .ssd_type = SDT_MEMRWA,
1076 /* GUGS32_SEL 3 32 bit %fs Descriptor for user */
1078 .ssd_limit = 0xfffff,
1079 .ssd_type = SDT_MEMRWA,
1085 /* GCODE_SEL 4 Code Descriptor for kernel */
1087 .ssd_limit = 0xfffff,
1088 .ssd_type = SDT_MEMERA,
1094 /* GDATA_SEL 5 Data Descriptor for kernel */
1096 .ssd_limit = 0xfffff,
1097 .ssd_type = SDT_MEMRWA,
1103 /* GUCODE32_SEL 6 32 bit Code Descriptor for user */
1105 .ssd_limit = 0xfffff,
1106 .ssd_type = SDT_MEMERA,
1112 /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */
1114 .ssd_limit = 0xfffff,
1115 .ssd_type = SDT_MEMRWA,
1121 /* GUCODE_SEL 8 64 bit Code Descriptor for user */
1123 .ssd_limit = 0xfffff,
1124 .ssd_type = SDT_MEMERA,
1130 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
1132 .ssd_limit = sizeof(struct amd64tss) + IOPAGES * PAGE_SIZE - 1,
1133 .ssd_type = SDT_SYSTSS,
1139 /* Actually, the TSS is a system descriptor which is double size */
1148 /* GUSERLDT_SEL 11 LDT Descriptor */
1157 /* GUSERLDT_SEL 12 LDT Descriptor, double size */
1169 setidt(idx, func, typ, dpl, ist)
1176 struct gate_descriptor *ip;
1179 ip->gd_looffset = (uintptr_t)func;
1180 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1186 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1190 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1191 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1192 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1193 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1194 IDTVEC(xmm), IDTVEC(dblfault),
1195 #ifdef KDTRACE_HOOKS
1198 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1202 * Display the index and function name of any IDT entries that don't use
1203 * the default 'rsvd' entry point.
1205 DB_SHOW_COMMAND(idt, db_show_idt)
1207 struct gate_descriptor *ip;
1212 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1213 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
1214 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1215 db_printf("%3d\t", idx);
1216 db_printsym(func, DB_STGY_PROC);
1226 struct user_segment_descriptor *sd;
1227 struct soft_segment_descriptor *ssd;
1230 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1231 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1232 ssd->ssd_type = sd->sd_type;
1233 ssd->ssd_dpl = sd->sd_dpl;
1234 ssd->ssd_p = sd->sd_p;
1235 ssd->ssd_long = sd->sd_long;
1236 ssd->ssd_def32 = sd->sd_def32;
1237 ssd->ssd_gran = sd->sd_gran;
1242 struct soft_segment_descriptor *ssd;
1243 struct user_segment_descriptor *sd;
1246 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1247 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1248 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1249 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1250 sd->sd_type = ssd->ssd_type;
1251 sd->sd_dpl = ssd->ssd_dpl;
1252 sd->sd_p = ssd->ssd_p;
1253 sd->sd_long = ssd->ssd_long;
1254 sd->sd_def32 = ssd->ssd_def32;
1255 sd->sd_gran = ssd->ssd_gran;
1260 struct soft_segment_descriptor *ssd;
1261 struct system_segment_descriptor *sd;
1264 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1265 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1266 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1267 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1268 sd->sd_type = ssd->ssd_type;
1269 sd->sd_dpl = ssd->ssd_dpl;
1270 sd->sd_p = ssd->ssd_p;
1271 sd->sd_gran = ssd->ssd_gran;
1274 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
1275 #include <isa/isavar.h>
1276 #include <isa/isareg.h>
1278 * Return a bitmap of the current interrupt requests. This is 8259-specific
1279 * and is only suitable for use at probe time.
1280 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
1281 * It shouldn't be here. There should probably be an APIC centric
1282 * implementation in the apic driver code, if at all.
1285 isa_irq_pending(void)
1290 irr1 = inb(IO_ICU1);
1291 irr2 = inb(IO_ICU2);
1292 return ((irr2 << 8) | irr1);
1299 add_smap_entry(struct bios_smap *smap, vm_paddr_t *physmap, int *physmap_idxp)
1301 int i, insert_idx, physmap_idx;
1303 physmap_idx = *physmap_idxp;
1305 if (boothowto & RB_VERBOSE)
1306 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1307 smap->type, smap->base, smap->length);
1309 if (smap->type != SMAP_TYPE_MEMORY)
1312 if (smap->length == 0)
1316 * Find insertion point while checking for overlap. Start off by
1317 * assuming the new entry will be added to the end.
1319 insert_idx = physmap_idx + 2;
1320 for (i = 0; i <= physmap_idx; i += 2) {
1321 if (smap->base < physmap[i + 1]) {
1322 if (smap->base + smap->length <= physmap[i]) {
1326 if (boothowto & RB_VERBOSE)
1328 "Overlapping memory regions, ignoring second region\n");
1333 /* See if we can prepend to the next entry. */
1334 if (insert_idx <= physmap_idx &&
1335 smap->base + smap->length == physmap[insert_idx]) {
1336 physmap[insert_idx] = smap->base;
1340 /* See if we can append to the previous entry. */
1341 if (insert_idx > 0 && smap->base == physmap[insert_idx - 1]) {
1342 physmap[insert_idx - 1] += smap->length;
1347 *physmap_idxp = physmap_idx;
1348 if (physmap_idx == PHYSMAP_SIZE) {
1350 "Too many segments in the physical address map, giving up\n");
1355 * Move the last 'N' entries down to make room for the new
1358 for (i = physmap_idx; i > insert_idx; i -= 2) {
1359 physmap[i] = physmap[i - 2];
1360 physmap[i + 1] = physmap[i - 1];
1363 /* Insert the new entry. */
1364 physmap[insert_idx] = smap->base;
1365 physmap[insert_idx + 1] = smap->base + smap->length;
1370 * Populate the (physmap) array with base/bound pairs describing the
1371 * available physical memory in the system, then test this memory and
1372 * build the phys_avail array describing the actually-available memory.
1374 * Total memory size may be set by the kernel environment variable
1375 * hw.physmem or the compile-time define MAXMEM.
1377 * XXX first should be vm_paddr_t.
1380 getmemsize(caddr_t kmdp, u_int64_t first)
1382 int i, physmap_idx, pa_indx, da_indx;
1383 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1384 u_long physmem_tunable, memtest;
1386 struct bios_smap *smapbase, *smap, *smapend;
1388 quad_t dcons_addr, dcons_size;
1390 bzero(physmap, sizeof(physmap));
1395 * get memory map from INT 15:E820, kindly supplied by the loader.
1397 * subr_module.c says:
1398 * "Consumer may safely assume that size value precedes data."
1399 * ie: an int32_t immediately precedes smap.
1401 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1402 MODINFO_METADATA | MODINFOMD_SMAP);
1403 if (smapbase == NULL)
1404 panic("No BIOS smap info from loader!");
1406 smapsize = *((u_int32_t *)smapbase - 1);
1407 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1409 for (smap = smapbase; smap < smapend; smap++)
1410 if (!add_smap_entry(smap, physmap, &physmap_idx))
1414 * Find the 'base memory' segment for SMP
1417 for (i = 0; i <= physmap_idx; i += 2) {
1418 if (physmap[i] == 0x00000000) {
1419 basemem = physmap[i + 1] / 1024;
1424 panic("BIOS smap did not include a basemem segment!");
1427 /* make hole for AP bootstrap code */
1428 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1432 * Maxmem isn't the "maximum memory", it's one larger than the
1433 * highest page of the physical address space. It should be
1434 * called something like "Maxphyspage". We may adjust this
1435 * based on ``hw.physmem'' and the results of the memory test.
1437 Maxmem = atop(physmap[physmap_idx + 1]);
1440 Maxmem = MAXMEM / 4;
1443 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1444 Maxmem = atop(physmem_tunable);
1447 * By default enable the memory test on real hardware, and disable
1448 * it if we appear to be running in a VM. This avoids touching all
1449 * pages unnecessarily, which doesn't matter on real hardware but is
1450 * bad for shared VM hosts. Use a general name so that
1451 * one could eventually do more with the code than just disable it.
1453 memtest = (vm_guest > VM_GUEST_NO) ? 0 : 1;
1454 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
1457 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1460 if (Maxmem > atop(physmap[physmap_idx + 1]))
1461 Maxmem = atop(physmap[physmap_idx + 1]);
1463 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1464 (boothowto & RB_VERBOSE))
1465 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1467 /* call pmap initialization to make new kernel address space */
1468 pmap_bootstrap(&first);
1471 * Size up each available chunk of physical memory.
1473 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1476 phys_avail[pa_indx++] = physmap[0];
1477 phys_avail[pa_indx] = physmap[0];
1478 dump_avail[da_indx] = physmap[0];
1482 * Get dcons buffer address
1484 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1485 getenv_quad("dcons.size", &dcons_size) == 0)
1489 * physmap is in bytes, so when converting to page boundaries,
1490 * round up the start address and round down the end address.
1492 for (i = 0; i <= physmap_idx; i += 2) {
1495 end = ptoa((vm_paddr_t)Maxmem);
1496 if (physmap[i + 1] < end)
1497 end = trunc_page(physmap[i + 1]);
1498 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1499 int tmp, page_bad, full;
1500 int *ptr = (int *)CADDR1;
1504 * block out kernel memory as not available.
1506 if (pa >= (vm_paddr_t)kernphys && pa < first)
1510 * block out dcons buffer
1513 && pa >= trunc_page(dcons_addr)
1514 && pa < dcons_addr + dcons_size)
1522 * map page into kernel: valid, read/write,non-cacheable
1524 *pte = pa | PG_V | PG_RW | PG_N;
1529 * Test for alternating 1's and 0's
1531 *(volatile int *)ptr = 0xaaaaaaaa;
1532 if (*(volatile int *)ptr != 0xaaaaaaaa)
1535 * Test for alternating 0's and 1's
1537 *(volatile int *)ptr = 0x55555555;
1538 if (*(volatile int *)ptr != 0x55555555)
1543 *(volatile int *)ptr = 0xffffffff;
1544 if (*(volatile int *)ptr != 0xffffffff)
1549 *(volatile int *)ptr = 0x0;
1550 if (*(volatile int *)ptr != 0x0)
1553 * Restore original value.
1559 * Adjust array of valid/good pages.
1561 if (page_bad == TRUE)
1564 * If this good page is a continuation of the
1565 * previous set of good pages, then just increase
1566 * the end pointer. Otherwise start a new chunk.
1567 * Note that "end" points one higher than end,
1568 * making the range >= start and < end.
1569 * If we're also doing a speculative memory
1570 * test and we at or past the end, bump up Maxmem
1571 * so that we keep going. The first bad page
1572 * will terminate the loop.
1574 if (phys_avail[pa_indx] == pa) {
1575 phys_avail[pa_indx] += PAGE_SIZE;
1578 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1580 "Too many holes in the physical address space, giving up\n");
1585 phys_avail[pa_indx++] = pa; /* start */
1586 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1590 if (dump_avail[da_indx] == pa) {
1591 dump_avail[da_indx] += PAGE_SIZE;
1594 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1598 dump_avail[da_indx++] = pa; /* start */
1599 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1611 * The last chunk must contain at least one page plus the message
1612 * buffer to avoid complicating other code (message buffer address
1613 * calculation, etc.).
1615 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1616 round_page(msgbufsize) >= phys_avail[pa_indx]) {
1617 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1618 phys_avail[pa_indx--] = 0;
1619 phys_avail[pa_indx--] = 0;
1622 Maxmem = atop(phys_avail[pa_indx]);
1624 /* Trim off space for the message buffer. */
1625 phys_avail[pa_indx] -= round_page(msgbufsize);
1627 /* Map the message buffer. */
1628 msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
1632 hammer_time(u_int64_t modulep, u_int64_t physfree)
1637 struct nmi_pcpu *np;
1638 struct xstate_hdr *xhdr;
1643 thread0.td_kstack = physfree + KERNBASE;
1644 thread0.td_kstack_pages = KSTACK_PAGES;
1645 kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
1646 bzero((void *)thread0.td_kstack, kstack0_sz);
1647 physfree += kstack0_sz;
1650 * This may be done better later if it gets more high level
1651 * components in it. If so just link td->td_proc here.
1653 proc_linkup0(&proc0, &thread0);
1655 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1656 preload_bootstrap_relocate(KERNBASE);
1657 kmdp = preload_search_by_type("elf kernel");
1659 kmdp = preload_search_by_type("elf64 kernel");
1660 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1661 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1663 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1664 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1667 /* Init basic tunables, hz etc */
1671 * make gdt memory segments
1673 for (x = 0; x < NGDT; x++) {
1674 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1675 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1676 ssdtosd(&gdt_segs[x], &gdt[x]);
1678 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1679 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1680 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1682 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1683 r_gdt.rd_base = (long) gdt;
1687 wrmsr(MSR_FSBASE, 0); /* User value */
1688 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1689 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1691 pcpu_init(pc, 0, sizeof(struct pcpu));
1692 dpcpu_init((void *)(physfree + KERNBASE), 0);
1693 physfree += DPCPU_SIZE;
1694 PCPU_SET(prvspace, pc);
1695 PCPU_SET(curthread, &thread0);
1696 PCPU_SET(tssp, &common_tss[0]);
1697 PCPU_SET(commontssp, &common_tss[0]);
1698 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1699 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1700 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1701 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1704 * Initialize mutexes.
1706 * icu_lock: in order to allow an interrupt to occur in a critical
1707 * section, to set pcpu->ipending (etc...) properly, we
1708 * must be able to get the icu lock, so it can't be
1712 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1713 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1716 for (x = 0; x < NIDT; x++)
1717 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1718 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1719 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1720 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1721 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1722 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1723 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1724 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1725 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1726 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1727 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1728 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1729 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1730 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1731 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1732 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1733 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1734 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1735 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1736 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1737 #ifdef KDTRACE_HOOKS
1738 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
1741 r_idt.rd_limit = sizeof(idt0) - 1;
1742 r_idt.rd_base = (long) idt;
1746 * Initialize the i8254 before the console so that console
1747 * initialization can use DELAY().
1752 * Initialize the console before we print anything out.
1761 /* Reset and mask the atpics and leave them shut down. */
1765 * Point the ICU spurious interrupt vectors at the APIC spurious
1766 * interrupt handler.
1768 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1769 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1772 #error "have you forgotten the isa device?";
1778 if (boothowto & RB_KDB)
1779 kdb_enter(KDB_WHY_BOOTFLAGS,
1780 "Boot flags requested debugger");
1783 identify_cpu(); /* Final stage of CPU initialization */
1784 initializecpu(); /* Initialize CPU registers */
1785 initializecpucache();
1787 /* doublefault stack space, runs on ist1 */
1788 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1791 * NMI stack, runs on ist2. The pcpu pointer is stored just
1792 * above the start of the ist2 stack.
1794 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1795 np->np_pcpu = (register_t) pc;
1796 common_tss[0].tss_ist2 = (long) np;
1798 /* Set the IO permission bitmap (empty due to tss seg limit) */
1799 common_tss[0].tss_iobase = sizeof(struct amd64tss) +
1800 IOPAGES * PAGE_SIZE;
1802 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1805 /* Set up the fast syscall stuff */
1806 msr = rdmsr(MSR_EFER) | EFER_SCE;
1807 wrmsr(MSR_EFER, msr);
1808 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1809 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1810 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1811 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1812 wrmsr(MSR_STAR, msr);
1813 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1815 getmemsize(kmdp, physfree);
1816 init_param2(physmem);
1818 /* now running on new page tables, configured,and u/iom is accessible */
1820 msgbufinit(msgbufp, msgbufsize);
1824 * Set up thread0 pcb after fpuinit calculated pcb + fpu save
1825 * area size. Zero out the extended state header in fpu save
1828 thread0.td_pcb = get_pcb_td(&thread0);
1829 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
1831 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
1833 xhdr->xstate_bv = xsave_mask;
1835 /* make an initial tss so cpu can get interrupt stack on syscall! */
1836 common_tss[0].tss_rsp0 = (vm_offset_t)thread0.td_pcb;
1837 /* Ensure the stack is aligned to 16 bytes */
1838 common_tss[0].tss_rsp0 &= ~0xFul;
1839 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1840 PCPU_SET(curpcb, thread0.td_pcb);
1842 /* transfer to user mode */
1844 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1845 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1846 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1847 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
1848 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
1854 /* setup proc 0's pcb */
1855 thread0.td_pcb->pcb_flags = 0;
1856 thread0.td_pcb->pcb_cr3 = KPML4phys;
1857 thread0.td_frame = &proc0_tf;
1859 env = getenv("kernelname");
1861 strlcpy(kernelname, env, sizeof(kernelname));
1864 if (inw(0x10) == 0x49d2) {
1866 printf("Xen detected: disabling emulated block and network devices\n");
1873 /* Location of kernel stack for locore */
1874 return ((u_int64_t)thread0.td_pcb);
1878 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1881 pcpu->pc_acpi_id = 0xffffffff;
1885 spinlock_enter(void)
1891 if (td->td_md.md_spinlock_count == 0) {
1892 flags = intr_disable();
1893 td->td_md.md_spinlock_count = 1;
1894 td->td_md.md_saved_flags = flags;
1896 td->td_md.md_spinlock_count++;
1908 flags = td->td_md.md_saved_flags;
1909 td->td_md.md_spinlock_count--;
1910 if (td->td_md.md_spinlock_count == 0)
1911 intr_restore(flags);
1915 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1916 * we want to start a backtrace from the function that caused us to enter
1917 * the debugger. We have the context in the trapframe, but base the trace
1918 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1919 * enough for a backtrace.
1922 makectx(struct trapframe *tf, struct pcb *pcb)
1925 pcb->pcb_r12 = tf->tf_r12;
1926 pcb->pcb_r13 = tf->tf_r13;
1927 pcb->pcb_r14 = tf->tf_r14;
1928 pcb->pcb_r15 = tf->tf_r15;
1929 pcb->pcb_rbp = tf->tf_rbp;
1930 pcb->pcb_rbx = tf->tf_rbx;
1931 pcb->pcb_rip = tf->tf_rip;
1932 pcb->pcb_rsp = tf->tf_rsp;
1936 ptrace_set_pc(struct thread *td, unsigned long addr)
1938 td->td_frame->tf_rip = addr;
1943 ptrace_single_step(struct thread *td)
1945 td->td_frame->tf_rflags |= PSL_T;
1950 ptrace_clear_single_step(struct thread *td)
1952 td->td_frame->tf_rflags &= ~PSL_T;
1957 fill_regs(struct thread *td, struct reg *regs)
1959 struct trapframe *tp;
1962 return (fill_frame_regs(tp, regs));
1966 fill_frame_regs(struct trapframe *tp, struct reg *regs)
1968 regs->r_r15 = tp->tf_r15;
1969 regs->r_r14 = tp->tf_r14;
1970 regs->r_r13 = tp->tf_r13;
1971 regs->r_r12 = tp->tf_r12;
1972 regs->r_r11 = tp->tf_r11;
1973 regs->r_r10 = tp->tf_r10;
1974 regs->r_r9 = tp->tf_r9;
1975 regs->r_r8 = tp->tf_r8;
1976 regs->r_rdi = tp->tf_rdi;
1977 regs->r_rsi = tp->tf_rsi;
1978 regs->r_rbp = tp->tf_rbp;
1979 regs->r_rbx = tp->tf_rbx;
1980 regs->r_rdx = tp->tf_rdx;
1981 regs->r_rcx = tp->tf_rcx;
1982 regs->r_rax = tp->tf_rax;
1983 regs->r_rip = tp->tf_rip;
1984 regs->r_cs = tp->tf_cs;
1985 regs->r_rflags = tp->tf_rflags;
1986 regs->r_rsp = tp->tf_rsp;
1987 regs->r_ss = tp->tf_ss;
1988 if (tp->tf_flags & TF_HASSEGS) {
1989 regs->r_ds = tp->tf_ds;
1990 regs->r_es = tp->tf_es;
1991 regs->r_fs = tp->tf_fs;
1992 regs->r_gs = tp->tf_gs;
2003 set_regs(struct thread *td, struct reg *regs)
2005 struct trapframe *tp;
2009 rflags = regs->r_rflags & 0xffffffff;
2010 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
2012 tp->tf_r15 = regs->r_r15;
2013 tp->tf_r14 = regs->r_r14;
2014 tp->tf_r13 = regs->r_r13;
2015 tp->tf_r12 = regs->r_r12;
2016 tp->tf_r11 = regs->r_r11;
2017 tp->tf_r10 = regs->r_r10;
2018 tp->tf_r9 = regs->r_r9;
2019 tp->tf_r8 = regs->r_r8;
2020 tp->tf_rdi = regs->r_rdi;
2021 tp->tf_rsi = regs->r_rsi;
2022 tp->tf_rbp = regs->r_rbp;
2023 tp->tf_rbx = regs->r_rbx;
2024 tp->tf_rdx = regs->r_rdx;
2025 tp->tf_rcx = regs->r_rcx;
2026 tp->tf_rax = regs->r_rax;
2027 tp->tf_rip = regs->r_rip;
2028 tp->tf_cs = regs->r_cs;
2029 tp->tf_rflags = rflags;
2030 tp->tf_rsp = regs->r_rsp;
2031 tp->tf_ss = regs->r_ss;
2032 if (0) { /* XXXKIB */
2033 tp->tf_ds = regs->r_ds;
2034 tp->tf_es = regs->r_es;
2035 tp->tf_fs = regs->r_fs;
2036 tp->tf_gs = regs->r_gs;
2037 tp->tf_flags = TF_HASSEGS;
2038 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
2043 /* XXX check all this stuff! */
2044 /* externalize from sv_xmm */
2046 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
2048 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2049 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2053 bzero(fpregs, sizeof(*fpregs));
2055 /* FPU control/status */
2056 penv_fpreg->en_cw = penv_xmm->en_cw;
2057 penv_fpreg->en_sw = penv_xmm->en_sw;
2058 penv_fpreg->en_tw = penv_xmm->en_tw;
2059 penv_fpreg->en_opcode = penv_xmm->en_opcode;
2060 penv_fpreg->en_rip = penv_xmm->en_rip;
2061 penv_fpreg->en_rdp = penv_xmm->en_rdp;
2062 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
2063 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
2066 for (i = 0; i < 8; ++i)
2067 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
2070 for (i = 0; i < 16; ++i)
2071 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
2074 /* internalize from fpregs into sv_xmm */
2076 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
2078 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2079 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2083 /* FPU control/status */
2084 penv_xmm->en_cw = penv_fpreg->en_cw;
2085 penv_xmm->en_sw = penv_fpreg->en_sw;
2086 penv_xmm->en_tw = penv_fpreg->en_tw;
2087 penv_xmm->en_opcode = penv_fpreg->en_opcode;
2088 penv_xmm->en_rip = penv_fpreg->en_rip;
2089 penv_xmm->en_rdp = penv_fpreg->en_rdp;
2090 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
2091 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
2094 for (i = 0; i < 8; ++i)
2095 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
2098 for (i = 0; i < 16; ++i)
2099 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
2102 /* externalize from td->pcb */
2104 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2107 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2108 P_SHOULDSTOP(td->td_proc),
2109 ("not suspended thread %p", td));
2111 fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs);
2115 /* internalize to td->pcb */
2117 set_fpregs(struct thread *td, struct fpreg *fpregs)
2120 set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
2126 * Get machine context.
2129 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2132 struct trapframe *tp;
2136 PROC_LOCK(curthread->td_proc);
2137 mcp->mc_onstack = sigonstack(tp->tf_rsp);
2138 PROC_UNLOCK(curthread->td_proc);
2139 mcp->mc_r15 = tp->tf_r15;
2140 mcp->mc_r14 = tp->tf_r14;
2141 mcp->mc_r13 = tp->tf_r13;
2142 mcp->mc_r12 = tp->tf_r12;
2143 mcp->mc_r11 = tp->tf_r11;
2144 mcp->mc_r10 = tp->tf_r10;
2145 mcp->mc_r9 = tp->tf_r9;
2146 mcp->mc_r8 = tp->tf_r8;
2147 mcp->mc_rdi = tp->tf_rdi;
2148 mcp->mc_rsi = tp->tf_rsi;
2149 mcp->mc_rbp = tp->tf_rbp;
2150 mcp->mc_rbx = tp->tf_rbx;
2151 mcp->mc_rcx = tp->tf_rcx;
2152 mcp->mc_rflags = tp->tf_rflags;
2153 if (flags & GET_MC_CLEAR_RET) {
2156 mcp->mc_rflags &= ~PSL_C;
2158 mcp->mc_rax = tp->tf_rax;
2159 mcp->mc_rdx = tp->tf_rdx;
2161 mcp->mc_rip = tp->tf_rip;
2162 mcp->mc_cs = tp->tf_cs;
2163 mcp->mc_rsp = tp->tf_rsp;
2164 mcp->mc_ss = tp->tf_ss;
2165 mcp->mc_ds = tp->tf_ds;
2166 mcp->mc_es = tp->tf_es;
2167 mcp->mc_fs = tp->tf_fs;
2168 mcp->mc_gs = tp->tf_gs;
2169 mcp->mc_flags = tp->tf_flags;
2170 mcp->mc_len = sizeof(*mcp);
2171 get_fpcontext(td, mcp, NULL, 0);
2172 mcp->mc_fsbase = pcb->pcb_fsbase;
2173 mcp->mc_gsbase = pcb->pcb_gsbase;
2174 mcp->mc_xfpustate = 0;
2175 mcp->mc_xfpustate_len = 0;
2176 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
2181 * Set machine context.
2183 * However, we don't set any but the user modifiable flags, and we won't
2184 * touch the cs selector.
2187 set_mcontext(struct thread *td, const mcontext_t *mcp)
2190 struct trapframe *tp;
2197 if (mcp->mc_len != sizeof(*mcp) ||
2198 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2200 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2201 (tp->tf_rflags & ~PSL_USERCHANGE);
2202 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2203 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2204 sizeof(struct savefpu))
2206 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2207 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2208 mcp->mc_xfpustate_len);
2213 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2216 tp->tf_r15 = mcp->mc_r15;
2217 tp->tf_r14 = mcp->mc_r14;
2218 tp->tf_r13 = mcp->mc_r13;
2219 tp->tf_r12 = mcp->mc_r12;
2220 tp->tf_r11 = mcp->mc_r11;
2221 tp->tf_r10 = mcp->mc_r10;
2222 tp->tf_r9 = mcp->mc_r9;
2223 tp->tf_r8 = mcp->mc_r8;
2224 tp->tf_rdi = mcp->mc_rdi;
2225 tp->tf_rsi = mcp->mc_rsi;
2226 tp->tf_rbp = mcp->mc_rbp;
2227 tp->tf_rbx = mcp->mc_rbx;
2228 tp->tf_rdx = mcp->mc_rdx;
2229 tp->tf_rcx = mcp->mc_rcx;
2230 tp->tf_rax = mcp->mc_rax;
2231 tp->tf_rip = mcp->mc_rip;
2232 tp->tf_rflags = rflags;
2233 tp->tf_rsp = mcp->mc_rsp;
2234 tp->tf_ss = mcp->mc_ss;
2235 tp->tf_flags = mcp->mc_flags;
2236 if (tp->tf_flags & TF_HASSEGS) {
2237 tp->tf_ds = mcp->mc_ds;
2238 tp->tf_es = mcp->mc_es;
2239 tp->tf_fs = mcp->mc_fs;
2240 tp->tf_gs = mcp->mc_gs;
2242 if (mcp->mc_flags & _MC_HASBASES) {
2243 pcb->pcb_fsbase = mcp->mc_fsbase;
2244 pcb->pcb_gsbase = mcp->mc_gsbase;
2246 set_pcb_flags(pcb, PCB_FULL_IRET);
2251 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2252 size_t xfpusave_len)
2254 size_t max_len, len;
2256 mcp->mc_ownedfp = fpugetregs(td);
2257 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate,
2258 sizeof(mcp->mc_fpstate));
2259 mcp->mc_fpformat = fpuformat();
2260 if (!use_xsave || xfpusave_len == 0)
2262 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
2264 if (len > max_len) {
2266 bzero(xfpusave + max_len, len - max_len);
2268 mcp->mc_flags |= _MC_HASFPXSTATE;
2269 mcp->mc_xfpustate_len = len;
2270 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
2274 set_fpcontext(struct thread *td, const mcontext_t *mcp, char *xfpustate,
2275 size_t xfpustate_len)
2277 struct savefpu *fpstate;
2280 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2282 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2284 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
2285 /* We don't care what state is left in the FPU or PCB. */
2288 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2289 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2290 fpstate = (struct savefpu *)&mcp->mc_fpstate;
2291 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
2292 error = fpusetregs(td, fpstate, xfpustate, xfpustate_len);
2299 fpstate_drop(struct thread *td)
2302 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
2304 if (PCPU_GET(fpcurthread) == td)
2307 * XXX force a full drop of the fpu. The above only drops it if we
2310 * XXX I don't much like fpugetuserregs()'s semantics of doing a full
2311 * drop. Dropping only to the pcb matches fnsave's behaviour.
2312 * We only need to drop to !PCB_INITDONE in sendsig(). But
2313 * sendsig() is the only caller of fpugetuserregs()... perhaps we just
2314 * have too many layers.
2316 clear_pcb_flags(curthread->td_pcb,
2317 PCB_FPUINITDONE | PCB_USERFPUINITDONE);
2322 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2327 dbregs->dr[0] = rdr0();
2328 dbregs->dr[1] = rdr1();
2329 dbregs->dr[2] = rdr2();
2330 dbregs->dr[3] = rdr3();
2331 dbregs->dr[6] = rdr6();
2332 dbregs->dr[7] = rdr7();
2335 dbregs->dr[0] = pcb->pcb_dr0;
2336 dbregs->dr[1] = pcb->pcb_dr1;
2337 dbregs->dr[2] = pcb->pcb_dr2;
2338 dbregs->dr[3] = pcb->pcb_dr3;
2339 dbregs->dr[6] = pcb->pcb_dr6;
2340 dbregs->dr[7] = pcb->pcb_dr7;
2356 set_dbregs(struct thread *td, struct dbreg *dbregs)
2362 load_dr0(dbregs->dr[0]);
2363 load_dr1(dbregs->dr[1]);
2364 load_dr2(dbregs->dr[2]);
2365 load_dr3(dbregs->dr[3]);
2366 load_dr6(dbregs->dr[6]);
2367 load_dr7(dbregs->dr[7]);
2370 * Don't let an illegal value for dr7 get set. Specifically,
2371 * check for undefined settings. Setting these bit patterns
2372 * result in undefined behaviour and can lead to an unexpected
2373 * TRCTRAP or a general protection fault right here.
2374 * Upper bits of dr6 and dr7 must not be set
2376 for (i = 0; i < 4; i++) {
2377 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2379 if (td->td_frame->tf_cs == _ucode32sel &&
2380 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2383 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2384 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2390 * Don't let a process set a breakpoint that is not within the
2391 * process's address space. If a process could do this, it
2392 * could halt the system by setting a breakpoint in the kernel
2393 * (if ddb was enabled). Thus, we need to check to make sure
2394 * that no breakpoints are being enabled for addresses outside
2395 * process's address space.
2397 * XXX - what about when the watched area of the user's
2398 * address space is written into from within the kernel
2399 * ... wouldn't that still cause a breakpoint to be generated
2400 * from within kernel mode?
2403 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2404 /* dr0 is enabled */
2405 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2408 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2409 /* dr1 is enabled */
2410 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2413 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2414 /* dr2 is enabled */
2415 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2418 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2419 /* dr3 is enabled */
2420 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2424 pcb->pcb_dr0 = dbregs->dr[0];
2425 pcb->pcb_dr1 = dbregs->dr[1];
2426 pcb->pcb_dr2 = dbregs->dr[2];
2427 pcb->pcb_dr3 = dbregs->dr[3];
2428 pcb->pcb_dr6 = dbregs->dr[6];
2429 pcb->pcb_dr7 = dbregs->dr[7];
2431 set_pcb_flags(pcb, PCB_DBREGS);
2441 load_dr7(0); /* Turn off the control bits first */
2450 * Return > 0 if a hardware breakpoint has been hit, and the
2451 * breakpoint was in user space. Return 0, otherwise.
2454 user_dbreg_trap(void)
2456 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2457 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2458 int nbp; /* number of breakpoints that triggered */
2459 caddr_t addr[4]; /* breakpoint addresses */
2463 if ((dr7 & 0x000000ff) == 0) {
2465 * all GE and LE bits in the dr7 register are zero,
2466 * thus the trap couldn't have been caused by the
2467 * hardware debug registers
2474 bp = dr6 & 0x0000000f;
2478 * None of the breakpoint bits are set meaning this
2479 * trap was not caused by any of the debug registers
2485 * at least one of the breakpoints were hit, check to see
2486 * which ones and if any of them are user space addresses
2490 addr[nbp++] = (caddr_t)rdr0();
2493 addr[nbp++] = (caddr_t)rdr1();
2496 addr[nbp++] = (caddr_t)rdr2();
2499 addr[nbp++] = (caddr_t)rdr3();
2502 for (i = 0; i < nbp; i++) {
2503 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2505 * addr[i] is in user space
2512 * None of the breakpoints are in user space.
2520 * Provide inb() and outb() as functions. They are normally only available as
2521 * inline functions, thus cannot be called from the debugger.
2524 /* silence compiler warnings */
2525 u_char inb_(u_short);
2526 void outb_(u_short, u_char);
2535 outb_(u_short port, u_char data)