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_platform.h"
57 #include "opt_sched.h"
58 #include "opt_kdtrace.h"
60 #include <sys/param.h>
62 #include <sys/systm.h>
66 #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>
91 #include <sys/syscallsubr.h>
92 #include <sys/sysctl.h>
93 #include <sys/sysent.h>
94 #include <sys/sysproto.h>
95 #include <sys/ucontext.h>
96 #include <sys/vmmeter.h>
99 #include <vm/vm_extern.h>
100 #include <vm/vm_kern.h>
101 #include <vm/vm_page.h>
102 #include <vm/vm_map.h>
103 #include <vm/vm_object.h>
104 #include <vm/vm_pager.h>
105 #include <vm/vm_param.h>
109 #error KDB must be enabled in order for DDB to work!
112 #include <ddb/db_sym.h>
115 #include <net/netisr.h>
117 #include <machine/clock.h>
118 #include <machine/cpu.h>
119 #include <machine/cputypes.h>
120 #include <machine/intr_machdep.h>
122 #include <machine/md_var.h>
123 #include <machine/metadata.h>
124 #include <machine/mp_watchdog.h>
125 #include <machine/pc/bios.h>
126 #include <machine/pcb.h>
127 #include <machine/proc.h>
128 #include <machine/reg.h>
129 #include <machine/sigframe.h>
130 #include <machine/specialreg.h>
132 #include <machine/perfmon.h>
134 #include <machine/tss.h>
136 #include <machine/smp.h>
143 #include <x86/isa/icu.h>
145 #include <machine/apicvar.h>
148 #include <isa/isareg.h>
151 /* Sanity check for __curthread() */
152 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
154 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
156 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
157 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
159 static void cpu_startup(void *);
160 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
161 char *xfpusave, size_t xfpusave_len);
162 static int set_fpcontext(struct thread *td, mcontext_t *mcp,
163 char *xfpustate, size_t xfpustate_len);
164 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
167 * The file "conf/ldscript.amd64" defines the symbol "kernphys". Its value is
168 * the physical address at which the kernel is loaded.
170 extern char kernphys[];
172 extern vm_offset_t ksym_start, ksym_end;
175 struct msgbuf *msgbufp;
177 /* Intel ICH registers */
178 #define ICH_PMBASE 0x400
179 #define ICH_SMI_EN ICH_PMBASE + 0x30
181 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
189 * The number of PHYSMAP entries must be one less than the number of
190 * PHYSSEG entries because the PHYSMAP entry that spans the largest
191 * physical address that is accessible by ISA DMA is split into two
194 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
196 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
197 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
199 /* must be 2 less so 0 0 can signal end of chunks */
200 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
201 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
203 struct kva_md_info kmi;
205 static struct trapframe proc0_tf;
206 struct region_descriptor r_gdt, r_idt;
208 struct pcpu __pcpu[MAXCPU];
212 struct mem_range_softc mem_range_softc;
214 struct mtx dt_lock; /* lock for GDT and LDT */
216 void (*vmm_resume_p)(void);
226 * On MacBooks, we need to disallow the legacy USB circuit to
227 * generate an SMI# because this can cause several problems,
228 * namely: incorrect CPU frequency detection and failure to
230 * We do this by disabling a bit in the SMI_EN (SMI Control and
231 * Enable register) of the Intel ICH LPC Interface Bridge.
233 sysenv = getenv("smbios.system.product");
234 if (sysenv != NULL) {
235 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
236 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
237 strncmp(sysenv, "MacBook4,1", 10) == 0 ||
238 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
239 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
240 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
241 strncmp(sysenv, "MacBookPro4,1", 13) == 0 ||
242 strncmp(sysenv, "Macmini1,1", 10) == 0) {
244 printf("Disabling LEGACY_USB_EN bit on "
246 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
252 * Good {morning,afternoon,evening,night}.
256 panicifcpuunsupported();
262 * Display physical memory if SMBIOS reports reasonable amount.
265 sysenv = getenv("smbios.memory.enabled");
266 if (sysenv != NULL) {
267 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
270 if (memsize < ptoa((uintmax_t)cnt.v_free_count))
271 memsize = ptoa((uintmax_t)Maxmem);
272 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
273 realmem = atop(memsize);
276 * Display any holes after the first chunk of extended memory.
281 printf("Physical memory chunk(s):\n");
282 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
285 size = phys_avail[indx + 1] - phys_avail[indx];
287 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
288 (uintmax_t)phys_avail[indx],
289 (uintmax_t)phys_avail[indx + 1] - 1,
290 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
294 vm_ksubmap_init(&kmi);
296 printf("avail memory = %ju (%ju MB)\n",
297 ptoa((uintmax_t)cnt.v_free_count),
298 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
301 * Set up buffers, so they can be used to read disk labels.
304 vm_pager_bufferinit();
310 * Send an interrupt to process.
312 * Stack is set up to allow sigcode stored
313 * at top to call routine, followed by call
314 * to sigreturn routine below. After sigreturn
315 * resets the signal mask, the stack, and the
316 * frame pointer, it returns to the user
320 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
322 struct sigframe sf, *sfp;
328 struct trapframe *regs;
337 PROC_LOCK_ASSERT(p, MA_OWNED);
338 sig = ksi->ksi_signo;
340 mtx_assert(&psp->ps_mtx, MA_OWNED);
342 oonstack = sigonstack(regs->tf_rsp);
344 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
345 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
346 xfpusave = __builtin_alloca(xfpusave_len);
352 /* Save user context. */
353 bzero(&sf, sizeof(sf));
354 sf.sf_uc.uc_sigmask = *mask;
355 sf.sf_uc.uc_stack = td->td_sigstk;
356 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
357 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
358 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
359 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
360 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
361 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
363 sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase;
364 sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase;
365 bzero(sf.sf_uc.uc_mcontext.mc_spare,
366 sizeof(sf.sf_uc.uc_mcontext.mc_spare));
367 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
369 /* Allocate space for the signal handler context. */
370 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
371 SIGISMEMBER(psp->ps_sigonstack, sig)) {
372 sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
373 #if defined(COMPAT_43)
374 td->td_sigstk.ss_flags |= SS_ONSTACK;
377 sp = (char *)regs->tf_rsp - 128;
378 if (xfpusave != NULL) {
380 sp = (char *)((unsigned long)sp & ~0x3Ful);
381 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
383 sp -= sizeof(struct sigframe);
384 /* Align to 16 bytes. */
385 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
387 /* Translate the signal if appropriate. */
388 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
389 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
391 /* Build the argument list for the signal handler. */
392 regs->tf_rdi = sig; /* arg 1 in %rdi */
393 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
394 bzero(&sf.sf_si, sizeof(sf.sf_si));
395 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
396 /* Signal handler installed with SA_SIGINFO. */
397 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
398 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
400 /* Fill in POSIX parts */
401 sf.sf_si = ksi->ksi_info;
402 sf.sf_si.si_signo = sig; /* maybe a translated signal */
403 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
405 /* Old FreeBSD-style arguments. */
406 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
407 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
408 sf.sf_ahu.sf_handler = catcher;
410 mtx_unlock(&psp->ps_mtx);
414 * Copy the sigframe out to the user's stack.
416 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
417 (xfpusave != NULL && copyout(xfpusave,
418 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
421 printf("process %ld has trashed its stack\n", (long)p->p_pid);
427 regs->tf_rsp = (long)sfp;
428 regs->tf_rip = p->p_sysent->sv_sigcode_base;
429 regs->tf_rflags &= ~(PSL_T | PSL_D);
430 regs->tf_cs = _ucodesel;
431 regs->tf_ds = _udatasel;
432 regs->tf_es = _udatasel;
433 regs->tf_fs = _ufssel;
434 regs->tf_gs = _ugssel;
435 regs->tf_flags = TF_HASSEGS;
436 set_pcb_flags(pcb, PCB_FULL_IRET);
438 mtx_lock(&psp->ps_mtx);
442 * System call to cleanup state after a signal
443 * has been taken. Reset signal mask and
444 * stack state from context left by sendsig (above).
445 * Return to previous pc and psl as specified by
446 * context left by sendsig. Check carefully to
447 * make sure that the user has not modified the
448 * state to gain improper privileges.
453 sys_sigreturn(td, uap)
455 struct sigreturn_args /* {
456 const struct __ucontext *sigcntxp;
462 struct trapframe *regs;
465 size_t xfpustate_len;
473 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
475 uprintf("pid %d (%s): sigreturn copyin failed\n",
476 p->p_pid, td->td_name);
480 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
481 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
482 td->td_name, ucp->uc_mcontext.mc_flags);
486 rflags = ucp->uc_mcontext.mc_rflags;
488 * Don't allow users to change privileged or reserved flags.
490 if (!EFL_SECURE(rflags, regs->tf_rflags)) {
491 uprintf("pid %d (%s): sigreturn rflags = 0x%lx\n", p->p_pid,
492 td->td_name, rflags);
497 * Don't allow users to load a valid privileged %cs. Let the
498 * hardware check for invalid selectors, excess privilege in
499 * other selectors, invalid %eip's and invalid %esp's.
501 cs = ucp->uc_mcontext.mc_cs;
502 if (!CS_SECURE(cs)) {
503 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", p->p_pid,
505 ksiginfo_init_trap(&ksi);
506 ksi.ksi_signo = SIGBUS;
507 ksi.ksi_code = BUS_OBJERR;
508 ksi.ksi_trapno = T_PROTFLT;
509 ksi.ksi_addr = (void *)regs->tf_rip;
510 trapsignal(td, &ksi);
514 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
515 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
516 if (xfpustate_len > cpu_max_ext_state_size -
517 sizeof(struct savefpu)) {
518 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
519 p->p_pid, td->td_name, xfpustate_len);
522 xfpustate = __builtin_alloca(xfpustate_len);
523 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate,
524 xfpustate, xfpustate_len);
527 "pid %d (%s): sigreturn copying xfpustate failed\n",
528 p->p_pid, td->td_name);
535 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate, xfpustate_len);
537 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
538 p->p_pid, td->td_name, ret);
541 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
542 pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase;
543 pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase;
545 #if defined(COMPAT_43)
546 if (ucp->uc_mcontext.mc_onstack & 1)
547 td->td_sigstk.ss_flags |= SS_ONSTACK;
549 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
552 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
553 set_pcb_flags(pcb, PCB_FULL_IRET);
554 return (EJUSTRETURN);
557 #ifdef COMPAT_FREEBSD4
559 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
562 return sys_sigreturn(td, (struct sigreturn_args *)uap);
568 * Machine dependent boot() routine
570 * I haven't seen anything to put here yet
571 * Possibly some stuff might be grafted back here from boot()
579 * Flush the D-cache for non-DMA I/O so that the I-cache can
580 * be made coherent later.
583 cpu_flush_dcache(void *ptr, size_t len)
588 /* Get current clock frequency for the given cpu id. */
590 cpu_est_clockrate(int cpu_id, uint64_t *rate)
593 uint64_t acnt, mcnt, perf;
596 if (pcpu_find(cpu_id) == NULL || rate == NULL)
600 * If TSC is P-state invariant and APERF/MPERF MSRs do not exist,
601 * DELAY(9) based logic fails.
603 if (tsc_is_invariant && !tsc_perf_stat)
608 /* Schedule ourselves on the indicated cpu. */
609 thread_lock(curthread);
610 sched_bind(curthread, cpu_id);
611 thread_unlock(curthread);
615 /* Calibrate by measuring a short delay. */
616 reg = intr_disable();
617 if (tsc_is_invariant) {
622 mcnt = rdmsr(MSR_MPERF);
623 acnt = rdmsr(MSR_APERF);
626 perf = 1000 * acnt / mcnt;
627 *rate = (tsc2 - tsc1) * perf;
633 *rate = (tsc2 - tsc1) * 1000;
638 thread_lock(curthread);
639 sched_unbind(curthread);
640 thread_unlock(curthread);
648 * Shutdown the CPU as much as possible
657 void (*cpu_idle_hook)(sbintime_t) = NULL; /* ACPI idle hook. */
658 static int cpu_ident_amdc1e = 0; /* AMD C1E supported. */
659 static int idle_mwait = 1; /* Use MONITOR/MWAIT for short idle. */
660 TUNABLE_INT("machdep.idle_mwait", &idle_mwait);
661 SYSCTL_INT(_machdep, OID_AUTO, idle_mwait, CTLFLAG_RW, &idle_mwait,
662 0, "Use MONITOR/MWAIT for short idle");
664 #define STATE_RUNNING 0x0
665 #define STATE_MWAIT 0x1
666 #define STATE_SLEEPING 0x2
669 cpu_idle_acpi(sbintime_t sbt)
673 state = (int *)PCPU_PTR(monitorbuf);
674 *state = STATE_SLEEPING;
676 /* See comments in cpu_idle_hlt(). */
678 if (sched_runnable())
680 else if (cpu_idle_hook)
683 __asm __volatile("sti; hlt");
684 *state = STATE_RUNNING;
688 cpu_idle_hlt(sbintime_t sbt)
692 state = (int *)PCPU_PTR(monitorbuf);
693 *state = STATE_SLEEPING;
696 * Since we may be in a critical section from cpu_idle(), if
697 * an interrupt fires during that critical section we may have
698 * a pending preemption. If the CPU halts, then that thread
699 * may not execute until a later interrupt awakens the CPU.
700 * To handle this race, check for a runnable thread after
701 * disabling interrupts and immediately return if one is
702 * found. Also, we must absolutely guarentee that hlt is
703 * the next instruction after sti. This ensures that any
704 * interrupt that fires after the call to disable_intr() will
705 * immediately awaken the CPU from hlt. Finally, please note
706 * that on x86 this works fine because of interrupts enabled only
707 * after the instruction following sti takes place, while IF is set
708 * to 1 immediately, allowing hlt instruction to acknowledge the
712 if (sched_runnable())
715 __asm __volatile("sti; hlt");
716 *state = STATE_RUNNING;
720 * MWAIT cpu power states. Lower 4 bits are sub-states.
722 #define MWAIT_C0 0xf0
723 #define MWAIT_C1 0x00
724 #define MWAIT_C2 0x10
725 #define MWAIT_C3 0x20
726 #define MWAIT_C4 0x30
729 cpu_idle_mwait(sbintime_t sbt)
733 state = (int *)PCPU_PTR(monitorbuf);
734 *state = STATE_MWAIT;
736 /* See comments in cpu_idle_hlt(). */
738 if (sched_runnable()) {
740 *state = STATE_RUNNING;
743 cpu_monitor(state, 0, 0);
744 if (*state == STATE_MWAIT)
745 __asm __volatile("sti; mwait" : : "a" (MWAIT_C1), "c" (0));
748 *state = STATE_RUNNING;
752 cpu_idle_spin(sbintime_t sbt)
757 state = (int *)PCPU_PTR(monitorbuf);
758 *state = STATE_RUNNING;
761 * The sched_runnable() call is racy but as long as there is
762 * a loop missing it one time will have just a little impact if any
763 * (and it is much better than missing the check at all).
765 for (i = 0; i < 1000; i++) {
766 if (sched_runnable())
773 * C1E renders the local APIC timer dead, so we disable it by
774 * reading the Interrupt Pending Message register and clearing
775 * both C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
778 * "BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors"
779 * #32559 revision 3.00+
781 #define MSR_AMDK8_IPM 0xc0010055
782 #define AMDK8_SMIONCMPHALT (1ULL << 27)
783 #define AMDK8_C1EONCMPHALT (1ULL << 28)
784 #define AMDK8_CMPHALT (AMDK8_SMIONCMPHALT | AMDK8_C1EONCMPHALT)
787 cpu_probe_amdc1e(void)
791 * Detect the presence of C1E capability mostly on latest
792 * dual-cores (or future) k8 family.
794 if (cpu_vendor_id == CPU_VENDOR_AMD &&
795 (cpu_id & 0x00000f00) == 0x00000f00 &&
796 (cpu_id & 0x0fff0000) >= 0x00040000) {
797 cpu_ident_amdc1e = 1;
801 void (*cpu_idle_fn)(sbintime_t) = 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. */
825 sbt = cpu_idleclock();
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);
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) {
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
1199 IDTVEC(xen_intr_upcall),
1201 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1205 * Display the index and function name of any IDT entries that don't use
1206 * the default 'rsvd' entry point.
1208 DB_SHOW_COMMAND(idt, db_show_idt)
1210 struct gate_descriptor *ip;
1215 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1216 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
1217 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1218 db_printf("%3d\t", idx);
1219 db_printsym(func, DB_STGY_PROC);
1226 /* Show privileged registers. */
1227 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
1232 } __packed idtr, gdtr;
1235 __asm __volatile("sidt %0" : "=m" (idtr));
1236 db_printf("idtr\t0x%016lx/%04x\n",
1237 (u_long)idtr.base, (u_int)idtr.limit);
1238 __asm __volatile("sgdt %0" : "=m" (gdtr));
1239 db_printf("gdtr\t0x%016lx/%04x\n",
1240 (u_long)gdtr.base, (u_int)gdtr.limit);
1241 __asm __volatile("sldt %0" : "=r" (ldt));
1242 db_printf("ldtr\t0x%04x\n", ldt);
1243 __asm __volatile("str %0" : "=r" (tr));
1244 db_printf("tr\t0x%04x\n", tr);
1245 db_printf("cr0\t0x%016lx\n", rcr0());
1246 db_printf("cr2\t0x%016lx\n", rcr2());
1247 db_printf("cr3\t0x%016lx\n", rcr3());
1248 db_printf("cr4\t0x%016lx\n", rcr4());
1249 db_printf("EFER\t%016lx\n", rdmsr(MSR_EFER));
1250 db_printf("FEATURES_CTL\t%016lx\n", rdmsr(MSR_IA32_FEATURE_CONTROL));
1251 db_printf("DEBUG_CTL\t%016lx\n", rdmsr(MSR_DEBUGCTLMSR));
1252 db_printf("PAT\t%016lx\n", rdmsr(MSR_PAT));
1253 db_printf("GSBASE\t%016lx\n", rdmsr(MSR_GSBASE));
1259 struct user_segment_descriptor *sd;
1260 struct soft_segment_descriptor *ssd;
1263 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1264 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1265 ssd->ssd_type = sd->sd_type;
1266 ssd->ssd_dpl = sd->sd_dpl;
1267 ssd->ssd_p = sd->sd_p;
1268 ssd->ssd_long = sd->sd_long;
1269 ssd->ssd_def32 = sd->sd_def32;
1270 ssd->ssd_gran = sd->sd_gran;
1275 struct soft_segment_descriptor *ssd;
1276 struct user_segment_descriptor *sd;
1279 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1280 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1281 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1282 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1283 sd->sd_type = ssd->ssd_type;
1284 sd->sd_dpl = ssd->ssd_dpl;
1285 sd->sd_p = ssd->ssd_p;
1286 sd->sd_long = ssd->ssd_long;
1287 sd->sd_def32 = ssd->ssd_def32;
1288 sd->sd_gran = ssd->ssd_gran;
1293 struct soft_segment_descriptor *ssd;
1294 struct system_segment_descriptor *sd;
1297 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1298 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1299 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1300 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1301 sd->sd_type = ssd->ssd_type;
1302 sd->sd_dpl = ssd->ssd_dpl;
1303 sd->sd_p = ssd->ssd_p;
1304 sd->sd_gran = ssd->ssd_gran;
1307 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
1308 #include <isa/isavar.h>
1309 #include <isa/isareg.h>
1311 * Return a bitmap of the current interrupt requests. This is 8259-specific
1312 * and is only suitable for use at probe time.
1313 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
1314 * It shouldn't be here. There should probably be an APIC centric
1315 * implementation in the apic driver code, if at all.
1318 isa_irq_pending(void)
1323 irr1 = inb(IO_ICU1);
1324 irr2 = inb(IO_ICU2);
1325 return ((irr2 << 8) | irr1);
1332 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
1335 int i, insert_idx, physmap_idx;
1337 physmap_idx = *physmap_idxp;
1343 * Find insertion point while checking for overlap. Start off by
1344 * assuming the new entry will be added to the end.
1346 insert_idx = physmap_idx + 2;
1347 for (i = 0; i <= physmap_idx; i += 2) {
1348 if (base < physmap[i + 1]) {
1349 if (base + length <= physmap[i]) {
1353 if (boothowto & RB_VERBOSE)
1355 "Overlapping memory regions, ignoring second region\n");
1360 /* See if we can prepend to the next entry. */
1361 if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) {
1362 physmap[insert_idx] = base;
1366 /* See if we can append to the previous entry. */
1367 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
1368 physmap[insert_idx - 1] += length;
1373 *physmap_idxp = physmap_idx;
1374 if (physmap_idx == PHYSMAP_SIZE) {
1376 "Too many segments in the physical address map, giving up\n");
1381 * Move the last 'N' entries down to make room for the new
1384 for (i = physmap_idx; i > insert_idx; i -= 2) {
1385 physmap[i] = physmap[i - 2];
1386 physmap[i + 1] = physmap[i - 1];
1389 /* Insert the new entry. */
1390 physmap[insert_idx] = base;
1391 physmap[insert_idx + 1] = base + length;
1396 add_smap_entries(struct bios_smap *smapbase, vm_paddr_t *physmap,
1399 struct bios_smap *smap, *smapend;
1403 * Memory map from INT 15:E820.
1405 * subr_module.c says:
1406 * "Consumer may safely assume that size value precedes data."
1407 * ie: an int32_t immediately precedes smap.
1409 smapsize = *((u_int32_t *)smapbase - 1);
1410 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1412 for (smap = smapbase; smap < smapend; smap++) {
1413 if (boothowto & RB_VERBOSE)
1414 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1415 smap->type, smap->base, smap->length);
1417 if (smap->type != SMAP_TYPE_MEMORY)
1420 if (!add_physmap_entry(smap->base, smap->length, physmap,
1426 #define efi_next_descriptor(ptr, size) \
1427 ((struct efi_md *)(((uint8_t *) ptr) + size))
1430 add_efi_map_entries(struct efi_map_header *efihdr, vm_paddr_t *physmap,
1433 struct efi_md *map, *p;
1438 static const char *types[] = {
1444 "RuntimeServicesCode",
1445 "RuntimeServicesData",
1446 "ConventionalMemory",
1448 "ACPIReclaimMemory",
1451 "MemoryMappedIOPortSpace",
1456 * Memory map data provided by UEFI via the GetMemoryMap
1457 * Boot Services API.
1459 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
1460 map = (struct efi_md *)((uint8_t *)efihdr + efisz);
1462 if (efihdr->descriptor_size == 0)
1464 ndesc = efihdr->memory_size / efihdr->descriptor_size;
1466 if (boothowto & RB_VERBOSE)
1467 printf("%23s %12s %12s %8s %4s\n",
1468 "Type", "Physical", "Virtual", "#Pages", "Attr");
1470 for (i = 0, p = map; i < ndesc; i++,
1471 p = efi_next_descriptor(p, efihdr->descriptor_size)) {
1472 if (boothowto & RB_VERBOSE) {
1473 if (p->md_type <= EFI_MD_TYPE_PALCODE)
1474 type = types[p->md_type];
1477 printf("%23s %012lx %12p %08lx ", type, p->md_phys,
1478 p->md_virt, p->md_pages);
1479 if (p->md_attr & EFI_MD_ATTR_UC)
1481 if (p->md_attr & EFI_MD_ATTR_WC)
1483 if (p->md_attr & EFI_MD_ATTR_WT)
1485 if (p->md_attr & EFI_MD_ATTR_WB)
1487 if (p->md_attr & EFI_MD_ATTR_UCE)
1489 if (p->md_attr & EFI_MD_ATTR_WP)
1491 if (p->md_attr & EFI_MD_ATTR_RP)
1493 if (p->md_attr & EFI_MD_ATTR_XP)
1495 if (p->md_attr & EFI_MD_ATTR_RT)
1500 switch (p->md_type) {
1501 case EFI_MD_TYPE_CODE:
1502 case EFI_MD_TYPE_DATA:
1503 case EFI_MD_TYPE_BS_CODE:
1504 case EFI_MD_TYPE_BS_DATA:
1505 case EFI_MD_TYPE_FREE:
1507 * We're allowed to use any entry with these types.
1514 if (!add_physmap_entry(p->md_phys, (p->md_pages * PAGE_SIZE),
1515 physmap, physmap_idx))
1520 static char bootmethod[16] = "";
1521 SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0,
1522 "System firmware boot method");
1525 * Populate the (physmap) array with base/bound pairs describing the
1526 * available physical memory in the system, then test this memory and
1527 * build the phys_avail array describing the actually-available memory.
1529 * Total memory size may be set by the kernel environment variable
1530 * hw.physmem or the compile-time define MAXMEM.
1532 * XXX first should be vm_paddr_t.
1535 getmemsize(caddr_t kmdp, u_int64_t first)
1537 int i, physmap_idx, pa_indx, da_indx;
1538 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1539 u_long physmem_start, physmem_tunable, memtest;
1541 struct bios_smap *smapbase;
1542 struct efi_map_header *efihdr;
1543 quad_t dcons_addr, dcons_size;
1545 bzero(physmap, sizeof(physmap));
1549 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1550 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1551 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1552 MODINFO_METADATA | MODINFOMD_SMAP);
1554 if (efihdr != NULL) {
1555 add_efi_map_entries(efihdr, physmap, &physmap_idx);
1556 strlcpy(bootmethod, "UEFI", sizeof(bootmethod));
1557 } else if (smapbase != NULL) {
1558 add_smap_entries(smapbase, physmap, &physmap_idx);
1559 strlcpy(bootmethod, "BIOS", sizeof(bootmethod));
1561 panic("No BIOS smap or EFI map info from loader!");
1565 * Find the 'base memory' segment for SMP
1568 for (i = 0; i <= physmap_idx; i += 2) {
1569 if (physmap[i] == 0x00000000) {
1570 basemem = physmap[i + 1] / 1024;
1575 panic("BIOS smap did not include a basemem segment!");
1578 /* make hole for AP bootstrap code */
1579 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1583 * Maxmem isn't the "maximum memory", it's one larger than the
1584 * highest page of the physical address space. It should be
1585 * called something like "Maxphyspage". We may adjust this
1586 * based on ``hw.physmem'' and the results of the memory test.
1588 Maxmem = atop(physmap[physmap_idx + 1]);
1591 Maxmem = MAXMEM / 4;
1594 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1595 Maxmem = atop(physmem_tunable);
1598 * By default enable the memory test on real hardware, and disable
1599 * it if we appear to be running in a VM. This avoids touching all
1600 * pages unnecessarily, which doesn't matter on real hardware but is
1601 * bad for shared VM hosts. Use a general name so that
1602 * one could eventually do more with the code than just disable it.
1604 memtest = (vm_guest > VM_GUEST_NO) ? 0 : 1;
1605 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
1608 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1611 if (Maxmem > atop(physmap[physmap_idx + 1]))
1612 Maxmem = atop(physmap[physmap_idx + 1]);
1614 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1615 (boothowto & RB_VERBOSE))
1616 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1618 /* call pmap initialization to make new kernel address space */
1619 pmap_bootstrap(&first);
1622 * Size up each available chunk of physical memory.
1624 * XXX Some BIOSes corrupt low 64KB between suspend and resume.
1625 * By default, mask off the first 16 pages unless we appear to be
1628 physmem_start = (vm_guest > VM_GUEST_NO ? 1 : 16) << PAGE_SHIFT;
1629 TUNABLE_ULONG_FETCH("hw.physmem.start", &physmem_start);
1630 if (physmem_start < PAGE_SIZE)
1631 physmap[0] = PAGE_SIZE;
1632 else if (physmem_start >= physmap[1])
1633 physmap[0] = round_page(physmap[1] - PAGE_SIZE);
1635 physmap[0] = round_page(physmem_start);
1638 phys_avail[pa_indx++] = physmap[0];
1639 phys_avail[pa_indx] = physmap[0];
1640 dump_avail[da_indx] = physmap[0];
1644 * Get dcons buffer address
1646 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1647 getenv_quad("dcons.size", &dcons_size) == 0)
1651 * physmap is in bytes, so when converting to page boundaries,
1652 * round up the start address and round down the end address.
1654 for (i = 0; i <= physmap_idx; i += 2) {
1657 end = ptoa((vm_paddr_t)Maxmem);
1658 if (physmap[i + 1] < end)
1659 end = trunc_page(physmap[i + 1]);
1660 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1661 int tmp, page_bad, full;
1662 int *ptr = (int *)CADDR1;
1666 * block out kernel memory as not available.
1668 if (pa >= (vm_paddr_t)kernphys && pa < first)
1672 * block out dcons buffer
1675 && pa >= trunc_page(dcons_addr)
1676 && pa < dcons_addr + dcons_size)
1684 * map page into kernel: valid, read/write,non-cacheable
1686 *pte = pa | PG_V | PG_RW | PG_NC_PWT | PG_NC_PCD;
1691 * Test for alternating 1's and 0's
1693 *(volatile int *)ptr = 0xaaaaaaaa;
1694 if (*(volatile int *)ptr != 0xaaaaaaaa)
1697 * Test for alternating 0's and 1's
1699 *(volatile int *)ptr = 0x55555555;
1700 if (*(volatile int *)ptr != 0x55555555)
1705 *(volatile int *)ptr = 0xffffffff;
1706 if (*(volatile int *)ptr != 0xffffffff)
1711 *(volatile int *)ptr = 0x0;
1712 if (*(volatile int *)ptr != 0x0)
1715 * Restore original value.
1721 * Adjust array of valid/good pages.
1723 if (page_bad == TRUE)
1726 * If this good page is a continuation of the
1727 * previous set of good pages, then just increase
1728 * the end pointer. Otherwise start a new chunk.
1729 * Note that "end" points one higher than end,
1730 * making the range >= start and < end.
1731 * If we're also doing a speculative memory
1732 * test and we at or past the end, bump up Maxmem
1733 * so that we keep going. The first bad page
1734 * will terminate the loop.
1736 if (phys_avail[pa_indx] == pa) {
1737 phys_avail[pa_indx] += PAGE_SIZE;
1740 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1742 "Too many holes in the physical address space, giving up\n");
1747 phys_avail[pa_indx++] = pa; /* start */
1748 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1752 if (dump_avail[da_indx] == pa) {
1753 dump_avail[da_indx] += PAGE_SIZE;
1756 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1760 dump_avail[da_indx++] = pa; /* start */
1761 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1773 * The last chunk must contain at least one page plus the message
1774 * buffer to avoid complicating other code (message buffer address
1775 * calculation, etc.).
1777 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1778 round_page(msgbufsize) >= phys_avail[pa_indx]) {
1779 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1780 phys_avail[pa_indx--] = 0;
1781 phys_avail[pa_indx--] = 0;
1784 Maxmem = atop(phys_avail[pa_indx]);
1786 /* Trim off space for the message buffer. */
1787 phys_avail[pa_indx] -= round_page(msgbufsize);
1789 /* Map the message buffer. */
1790 msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
1794 hammer_time(u_int64_t modulep, u_int64_t physfree)
1799 struct nmi_pcpu *np;
1800 struct xstate_hdr *xhdr;
1805 thread0.td_kstack = physfree + KERNBASE;
1806 thread0.td_kstack_pages = KSTACK_PAGES;
1807 kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
1808 bzero((void *)thread0.td_kstack, kstack0_sz);
1809 physfree += kstack0_sz;
1812 * This may be done better later if it gets more high level
1813 * components in it. If so just link td->td_proc here.
1815 proc_linkup0(&proc0, &thread0);
1817 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1818 preload_bootstrap_relocate(KERNBASE);
1819 kmdp = preload_search_by_type("elf kernel");
1821 kmdp = preload_search_by_type("elf64 kernel");
1822 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1823 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1825 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1826 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1829 /* Init basic tunables, hz etc */
1833 * make gdt memory segments
1835 for (x = 0; x < NGDT; x++) {
1836 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1837 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1838 ssdtosd(&gdt_segs[x], &gdt[x]);
1840 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1841 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1842 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1844 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1845 r_gdt.rd_base = (long) gdt;
1849 wrmsr(MSR_FSBASE, 0); /* User value */
1850 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1851 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1853 pcpu_init(pc, 0, sizeof(struct pcpu));
1854 dpcpu_init((void *)(physfree + KERNBASE), 0);
1855 physfree += DPCPU_SIZE;
1856 PCPU_SET(prvspace, pc);
1857 PCPU_SET(curthread, &thread0);
1858 PCPU_SET(tssp, &common_tss[0]);
1859 PCPU_SET(commontssp, &common_tss[0]);
1860 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1861 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1862 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1863 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1866 * Initialize mutexes.
1868 * icu_lock: in order to allow an interrupt to occur in a critical
1869 * section, to set pcpu->ipending (etc...) properly, we
1870 * must be able to get the icu lock, so it can't be
1874 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1875 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1878 for (x = 0; x < NIDT; x++)
1879 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1880 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1881 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1882 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1883 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1884 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1885 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1886 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1887 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1888 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1889 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1890 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1891 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1892 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1893 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1894 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1895 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1896 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1897 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1898 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1899 #ifdef KDTRACE_HOOKS
1900 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
1903 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall), SDT_SYSIGT, SEL_UPL, 0);
1906 r_idt.rd_limit = sizeof(idt0) - 1;
1907 r_idt.rd_base = (long) idt;
1911 * Initialize the i8254 before the console so that console
1912 * initialization can use DELAY().
1917 * Use vt(4) by default for UEFI boot (during the sc(4)/vt(4)
1920 if (kmdp != NULL && preload_search_info(kmdp,
1921 MODINFO_METADATA | MODINFOMD_EFI_MAP) != NULL)
1922 vty_set_preferred(VTY_VT);
1925 * Initialize the console before we print anything out.
1934 /* Reset and mask the atpics and leave them shut down. */
1938 * Point the ICU spurious interrupt vectors at the APIC spurious
1939 * interrupt handler.
1941 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1942 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1945 #error "have you forgotten the isa device?";
1951 if (boothowto & RB_KDB)
1952 kdb_enter(KDB_WHY_BOOTFLAGS,
1953 "Boot flags requested debugger");
1956 identify_cpu(); /* Final stage of CPU initialization */
1957 initializecpu(); /* Initialize CPU registers */
1958 initializecpucache();
1960 /* doublefault stack space, runs on ist1 */
1961 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1964 * NMI stack, runs on ist2. The pcpu pointer is stored just
1965 * above the start of the ist2 stack.
1967 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1968 np->np_pcpu = (register_t) pc;
1969 common_tss[0].tss_ist2 = (long) np;
1971 /* Set the IO permission bitmap (empty due to tss seg limit) */
1972 common_tss[0].tss_iobase = sizeof(struct amd64tss) +
1973 IOPAGES * PAGE_SIZE;
1975 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1978 /* Set up the fast syscall stuff */
1979 msr = rdmsr(MSR_EFER) | EFER_SCE;
1980 wrmsr(MSR_EFER, msr);
1981 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1982 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1983 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1984 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1985 wrmsr(MSR_STAR, msr);
1986 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1988 getmemsize(kmdp, physfree);
1989 init_param2(physmem);
1991 /* now running on new page tables, configured,and u/iom is accessible */
1993 msgbufinit(msgbufp, msgbufsize);
1997 * Set up thread0 pcb after fpuinit calculated pcb + fpu save
1998 * area size. Zero out the extended state header in fpu save
2001 thread0.td_pcb = get_pcb_td(&thread0);
2002 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
2004 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
2006 xhdr->xstate_bv = xsave_mask;
2008 /* make an initial tss so cpu can get interrupt stack on syscall! */
2009 common_tss[0].tss_rsp0 = (vm_offset_t)thread0.td_pcb;
2010 /* Ensure the stack is aligned to 16 bytes */
2011 common_tss[0].tss_rsp0 &= ~0xFul;
2012 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
2013 PCPU_SET(curpcb, thread0.td_pcb);
2015 /* transfer to user mode */
2017 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
2018 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
2019 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
2020 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
2021 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
2027 /* setup proc 0's pcb */
2028 thread0.td_pcb->pcb_flags = 0;
2029 thread0.td_pcb->pcb_cr3 = KPML4phys; /* PCID 0 is reserved for kernel */
2030 thread0.td_frame = &proc0_tf;
2032 env = getenv("kernelname");
2034 strlcpy(kernelname, env, sizeof(kernelname));
2042 /* Location of kernel stack for locore */
2043 return ((u_int64_t)thread0.td_pcb);
2047 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
2050 pcpu->pc_acpi_id = 0xffffffff;
2054 smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
2056 struct bios_smap *smapbase;
2057 struct bios_smap_xattr smap;
2060 int count, error, i;
2062 /* Retrieve the system memory map from the loader. */
2063 kmdp = preload_search_by_type("elf kernel");
2065 kmdp = preload_search_by_type("elf64 kernel");
2066 smapbase = (struct bios_smap *)preload_search_info(kmdp,
2067 MODINFO_METADATA | MODINFOMD_SMAP);
2068 if (smapbase == NULL)
2070 smapattr = (uint32_t *)preload_search_info(kmdp,
2071 MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
2072 count = *((uint32_t *)smapbase - 1) / sizeof(*smapbase);
2074 for (i = 0; i < count; i++) {
2075 smap.base = smapbase[i].base;
2076 smap.length = smapbase[i].length;
2077 smap.type = smapbase[i].type;
2078 if (smapattr != NULL)
2079 smap.xattr = smapattr[i];
2082 error = SYSCTL_OUT(req, &smap, sizeof(smap));
2086 SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
2087 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
2090 efi_map_sysctl_handler(SYSCTL_HANDLER_ARGS)
2092 struct efi_map_header *efihdr;
2096 kmdp = preload_search_by_type("elf kernel");
2098 kmdp = preload_search_by_type("elf64 kernel");
2099 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
2100 MODINFO_METADATA | MODINFOMD_EFI_MAP);
2103 efisize = *((uint32_t *)efihdr - 1);
2104 return (SYSCTL_OUT(req, efihdr, efisize));
2106 SYSCTL_PROC(_machdep, OID_AUTO, efi_map, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
2107 efi_map_sysctl_handler, "S,efi_map_header", "Raw EFI Memory Map");
2110 spinlock_enter(void)
2116 if (td->td_md.md_spinlock_count == 0) {
2117 flags = intr_disable();
2118 td->td_md.md_spinlock_count = 1;
2119 td->td_md.md_saved_flags = flags;
2121 td->td_md.md_spinlock_count++;
2133 flags = td->td_md.md_saved_flags;
2134 td->td_md.md_spinlock_count--;
2135 if (td->td_md.md_spinlock_count == 0)
2136 intr_restore(flags);
2140 * Construct a PCB from a trapframe. This is called from kdb_trap() where
2141 * we want to start a backtrace from the function that caused us to enter
2142 * the debugger. We have the context in the trapframe, but base the trace
2143 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
2144 * enough for a backtrace.
2147 makectx(struct trapframe *tf, struct pcb *pcb)
2150 pcb->pcb_r12 = tf->tf_r12;
2151 pcb->pcb_r13 = tf->tf_r13;
2152 pcb->pcb_r14 = tf->tf_r14;
2153 pcb->pcb_r15 = tf->tf_r15;
2154 pcb->pcb_rbp = tf->tf_rbp;
2155 pcb->pcb_rbx = tf->tf_rbx;
2156 pcb->pcb_rip = tf->tf_rip;
2157 pcb->pcb_rsp = tf->tf_rsp;
2161 ptrace_set_pc(struct thread *td, unsigned long addr)
2164 td->td_frame->tf_rip = addr;
2165 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
2170 ptrace_single_step(struct thread *td)
2172 td->td_frame->tf_rflags |= PSL_T;
2177 ptrace_clear_single_step(struct thread *td)
2179 td->td_frame->tf_rflags &= ~PSL_T;
2184 fill_regs(struct thread *td, struct reg *regs)
2186 struct trapframe *tp;
2189 return (fill_frame_regs(tp, regs));
2193 fill_frame_regs(struct trapframe *tp, struct reg *regs)
2195 regs->r_r15 = tp->tf_r15;
2196 regs->r_r14 = tp->tf_r14;
2197 regs->r_r13 = tp->tf_r13;
2198 regs->r_r12 = tp->tf_r12;
2199 regs->r_r11 = tp->tf_r11;
2200 regs->r_r10 = tp->tf_r10;
2201 regs->r_r9 = tp->tf_r9;
2202 regs->r_r8 = tp->tf_r8;
2203 regs->r_rdi = tp->tf_rdi;
2204 regs->r_rsi = tp->tf_rsi;
2205 regs->r_rbp = tp->tf_rbp;
2206 regs->r_rbx = tp->tf_rbx;
2207 regs->r_rdx = tp->tf_rdx;
2208 regs->r_rcx = tp->tf_rcx;
2209 regs->r_rax = tp->tf_rax;
2210 regs->r_rip = tp->tf_rip;
2211 regs->r_cs = tp->tf_cs;
2212 regs->r_rflags = tp->tf_rflags;
2213 regs->r_rsp = tp->tf_rsp;
2214 regs->r_ss = tp->tf_ss;
2215 if (tp->tf_flags & TF_HASSEGS) {
2216 regs->r_ds = tp->tf_ds;
2217 regs->r_es = tp->tf_es;
2218 regs->r_fs = tp->tf_fs;
2219 regs->r_gs = tp->tf_gs;
2230 set_regs(struct thread *td, struct reg *regs)
2232 struct trapframe *tp;
2236 rflags = regs->r_rflags & 0xffffffff;
2237 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
2239 tp->tf_r15 = regs->r_r15;
2240 tp->tf_r14 = regs->r_r14;
2241 tp->tf_r13 = regs->r_r13;
2242 tp->tf_r12 = regs->r_r12;
2243 tp->tf_r11 = regs->r_r11;
2244 tp->tf_r10 = regs->r_r10;
2245 tp->tf_r9 = regs->r_r9;
2246 tp->tf_r8 = regs->r_r8;
2247 tp->tf_rdi = regs->r_rdi;
2248 tp->tf_rsi = regs->r_rsi;
2249 tp->tf_rbp = regs->r_rbp;
2250 tp->tf_rbx = regs->r_rbx;
2251 tp->tf_rdx = regs->r_rdx;
2252 tp->tf_rcx = regs->r_rcx;
2253 tp->tf_rax = regs->r_rax;
2254 tp->tf_rip = regs->r_rip;
2255 tp->tf_cs = regs->r_cs;
2256 tp->tf_rflags = rflags;
2257 tp->tf_rsp = regs->r_rsp;
2258 tp->tf_ss = regs->r_ss;
2259 if (0) { /* XXXKIB */
2260 tp->tf_ds = regs->r_ds;
2261 tp->tf_es = regs->r_es;
2262 tp->tf_fs = regs->r_fs;
2263 tp->tf_gs = regs->r_gs;
2264 tp->tf_flags = TF_HASSEGS;
2266 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
2270 /* XXX check all this stuff! */
2271 /* externalize from sv_xmm */
2273 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
2275 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2276 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2280 bzero(fpregs, sizeof(*fpregs));
2282 /* FPU control/status */
2283 penv_fpreg->en_cw = penv_xmm->en_cw;
2284 penv_fpreg->en_sw = penv_xmm->en_sw;
2285 penv_fpreg->en_tw = penv_xmm->en_tw;
2286 penv_fpreg->en_opcode = penv_xmm->en_opcode;
2287 penv_fpreg->en_rip = penv_xmm->en_rip;
2288 penv_fpreg->en_rdp = penv_xmm->en_rdp;
2289 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
2290 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
2293 for (i = 0; i < 8; ++i)
2294 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
2297 for (i = 0; i < 16; ++i)
2298 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
2301 /* internalize from fpregs into sv_xmm */
2303 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
2305 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2306 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2310 /* FPU control/status */
2311 penv_xmm->en_cw = penv_fpreg->en_cw;
2312 penv_xmm->en_sw = penv_fpreg->en_sw;
2313 penv_xmm->en_tw = penv_fpreg->en_tw;
2314 penv_xmm->en_opcode = penv_fpreg->en_opcode;
2315 penv_xmm->en_rip = penv_fpreg->en_rip;
2316 penv_xmm->en_rdp = penv_fpreg->en_rdp;
2317 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
2318 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
2321 for (i = 0; i < 8; ++i)
2322 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
2325 for (i = 0; i < 16; ++i)
2326 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
2329 /* externalize from td->pcb */
2331 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2334 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2335 P_SHOULDSTOP(td->td_proc),
2336 ("not suspended thread %p", td));
2338 fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs);
2342 /* internalize to td->pcb */
2344 set_fpregs(struct thread *td, struct fpreg *fpregs)
2347 set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
2353 * Get machine context.
2356 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2359 struct trapframe *tp;
2363 PROC_LOCK(curthread->td_proc);
2364 mcp->mc_onstack = sigonstack(tp->tf_rsp);
2365 PROC_UNLOCK(curthread->td_proc);
2366 mcp->mc_r15 = tp->tf_r15;
2367 mcp->mc_r14 = tp->tf_r14;
2368 mcp->mc_r13 = tp->tf_r13;
2369 mcp->mc_r12 = tp->tf_r12;
2370 mcp->mc_r11 = tp->tf_r11;
2371 mcp->mc_r10 = tp->tf_r10;
2372 mcp->mc_r9 = tp->tf_r9;
2373 mcp->mc_r8 = tp->tf_r8;
2374 mcp->mc_rdi = tp->tf_rdi;
2375 mcp->mc_rsi = tp->tf_rsi;
2376 mcp->mc_rbp = tp->tf_rbp;
2377 mcp->mc_rbx = tp->tf_rbx;
2378 mcp->mc_rcx = tp->tf_rcx;
2379 mcp->mc_rflags = tp->tf_rflags;
2380 if (flags & GET_MC_CLEAR_RET) {
2383 mcp->mc_rflags &= ~PSL_C;
2385 mcp->mc_rax = tp->tf_rax;
2386 mcp->mc_rdx = tp->tf_rdx;
2388 mcp->mc_rip = tp->tf_rip;
2389 mcp->mc_cs = tp->tf_cs;
2390 mcp->mc_rsp = tp->tf_rsp;
2391 mcp->mc_ss = tp->tf_ss;
2392 mcp->mc_ds = tp->tf_ds;
2393 mcp->mc_es = tp->tf_es;
2394 mcp->mc_fs = tp->tf_fs;
2395 mcp->mc_gs = tp->tf_gs;
2396 mcp->mc_flags = tp->tf_flags;
2397 mcp->mc_len = sizeof(*mcp);
2398 get_fpcontext(td, mcp, NULL, 0);
2399 mcp->mc_fsbase = pcb->pcb_fsbase;
2400 mcp->mc_gsbase = pcb->pcb_gsbase;
2401 mcp->mc_xfpustate = 0;
2402 mcp->mc_xfpustate_len = 0;
2403 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
2408 * Set machine context.
2410 * However, we don't set any but the user modifiable flags, and we won't
2411 * touch the cs selector.
2414 set_mcontext(struct thread *td, mcontext_t *mcp)
2417 struct trapframe *tp;
2424 if (mcp->mc_len != sizeof(*mcp) ||
2425 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2427 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2428 (tp->tf_rflags & ~PSL_USERCHANGE);
2429 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2430 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2431 sizeof(struct savefpu))
2433 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2434 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2435 mcp->mc_xfpustate_len);
2440 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2443 tp->tf_r15 = mcp->mc_r15;
2444 tp->tf_r14 = mcp->mc_r14;
2445 tp->tf_r13 = mcp->mc_r13;
2446 tp->tf_r12 = mcp->mc_r12;
2447 tp->tf_r11 = mcp->mc_r11;
2448 tp->tf_r10 = mcp->mc_r10;
2449 tp->tf_r9 = mcp->mc_r9;
2450 tp->tf_r8 = mcp->mc_r8;
2451 tp->tf_rdi = mcp->mc_rdi;
2452 tp->tf_rsi = mcp->mc_rsi;
2453 tp->tf_rbp = mcp->mc_rbp;
2454 tp->tf_rbx = mcp->mc_rbx;
2455 tp->tf_rdx = mcp->mc_rdx;
2456 tp->tf_rcx = mcp->mc_rcx;
2457 tp->tf_rax = mcp->mc_rax;
2458 tp->tf_rip = mcp->mc_rip;
2459 tp->tf_rflags = rflags;
2460 tp->tf_rsp = mcp->mc_rsp;
2461 tp->tf_ss = mcp->mc_ss;
2462 tp->tf_flags = mcp->mc_flags;
2463 if (tp->tf_flags & TF_HASSEGS) {
2464 tp->tf_ds = mcp->mc_ds;
2465 tp->tf_es = mcp->mc_es;
2466 tp->tf_fs = mcp->mc_fs;
2467 tp->tf_gs = mcp->mc_gs;
2469 if (mcp->mc_flags & _MC_HASBASES) {
2470 pcb->pcb_fsbase = mcp->mc_fsbase;
2471 pcb->pcb_gsbase = mcp->mc_gsbase;
2473 set_pcb_flags(pcb, PCB_FULL_IRET);
2478 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2479 size_t xfpusave_len)
2481 size_t max_len, len;
2483 mcp->mc_ownedfp = fpugetregs(td);
2484 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
2485 sizeof(mcp->mc_fpstate));
2486 mcp->mc_fpformat = fpuformat();
2487 if (!use_xsave || xfpusave_len == 0)
2489 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
2491 if (len > max_len) {
2493 bzero(xfpusave + max_len, len - max_len);
2495 mcp->mc_flags |= _MC_HASFPXSTATE;
2496 mcp->mc_xfpustate_len = len;
2497 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
2501 set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate,
2502 size_t xfpustate_len)
2504 struct savefpu *fpstate;
2507 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2509 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2511 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
2512 /* We don't care what state is left in the FPU or PCB. */
2515 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2516 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2517 fpstate = (struct savefpu *)&mcp->mc_fpstate;
2518 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
2519 error = fpusetregs(td, fpstate, xfpustate, xfpustate_len);
2526 fpstate_drop(struct thread *td)
2529 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
2531 if (PCPU_GET(fpcurthread) == td)
2534 * XXX force a full drop of the fpu. The above only drops it if we
2537 * XXX I don't much like fpugetuserregs()'s semantics of doing a full
2538 * drop. Dropping only to the pcb matches fnsave's behaviour.
2539 * We only need to drop to !PCB_INITDONE in sendsig(). But
2540 * sendsig() is the only caller of fpugetuserregs()... perhaps we just
2541 * have too many layers.
2543 clear_pcb_flags(curthread->td_pcb,
2544 PCB_FPUINITDONE | PCB_USERFPUINITDONE);
2549 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2554 dbregs->dr[0] = rdr0();
2555 dbregs->dr[1] = rdr1();
2556 dbregs->dr[2] = rdr2();
2557 dbregs->dr[3] = rdr3();
2558 dbregs->dr[6] = rdr6();
2559 dbregs->dr[7] = rdr7();
2562 dbregs->dr[0] = pcb->pcb_dr0;
2563 dbregs->dr[1] = pcb->pcb_dr1;
2564 dbregs->dr[2] = pcb->pcb_dr2;
2565 dbregs->dr[3] = pcb->pcb_dr3;
2566 dbregs->dr[6] = pcb->pcb_dr6;
2567 dbregs->dr[7] = pcb->pcb_dr7;
2583 set_dbregs(struct thread *td, struct dbreg *dbregs)
2589 load_dr0(dbregs->dr[0]);
2590 load_dr1(dbregs->dr[1]);
2591 load_dr2(dbregs->dr[2]);
2592 load_dr3(dbregs->dr[3]);
2593 load_dr6(dbregs->dr[6]);
2594 load_dr7(dbregs->dr[7]);
2597 * Don't let an illegal value for dr7 get set. Specifically,
2598 * check for undefined settings. Setting these bit patterns
2599 * result in undefined behaviour and can lead to an unexpected
2600 * TRCTRAP or a general protection fault right here.
2601 * Upper bits of dr6 and dr7 must not be set
2603 for (i = 0; i < 4; i++) {
2604 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2606 if (td->td_frame->tf_cs == _ucode32sel &&
2607 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2610 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2611 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2617 * Don't let a process set a breakpoint that is not within the
2618 * process's address space. If a process could do this, it
2619 * could halt the system by setting a breakpoint in the kernel
2620 * (if ddb was enabled). Thus, we need to check to make sure
2621 * that no breakpoints are being enabled for addresses outside
2622 * process's address space.
2624 * XXX - what about when the watched area of the user's
2625 * address space is written into from within the kernel
2626 * ... wouldn't that still cause a breakpoint to be generated
2627 * from within kernel mode?
2630 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2631 /* dr0 is enabled */
2632 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2635 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2636 /* dr1 is enabled */
2637 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2640 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2641 /* dr2 is enabled */
2642 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2645 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2646 /* dr3 is enabled */
2647 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2651 pcb->pcb_dr0 = dbregs->dr[0];
2652 pcb->pcb_dr1 = dbregs->dr[1];
2653 pcb->pcb_dr2 = dbregs->dr[2];
2654 pcb->pcb_dr3 = dbregs->dr[3];
2655 pcb->pcb_dr6 = dbregs->dr[6];
2656 pcb->pcb_dr7 = dbregs->dr[7];
2658 set_pcb_flags(pcb, PCB_DBREGS);
2668 load_dr7(0); /* Turn off the control bits first */
2677 * Return > 0 if a hardware breakpoint has been hit, and the
2678 * breakpoint was in user space. Return 0, otherwise.
2681 user_dbreg_trap(void)
2683 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2684 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2685 int nbp; /* number of breakpoints that triggered */
2686 caddr_t addr[4]; /* breakpoint addresses */
2690 if ((dr7 & 0x000000ff) == 0) {
2692 * all GE and LE bits in the dr7 register are zero,
2693 * thus the trap couldn't have been caused by the
2694 * hardware debug registers
2701 bp = dr6 & 0x0000000f;
2705 * None of the breakpoint bits are set meaning this
2706 * trap was not caused by any of the debug registers
2712 * at least one of the breakpoints were hit, check to see
2713 * which ones and if any of them are user space addresses
2717 addr[nbp++] = (caddr_t)rdr0();
2720 addr[nbp++] = (caddr_t)rdr1();
2723 addr[nbp++] = (caddr_t)rdr2();
2726 addr[nbp++] = (caddr_t)rdr3();
2729 for (i = 0; i < nbp; i++) {
2730 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2732 * addr[i] is in user space
2739 * None of the breakpoints are in user space.
2747 * Provide inb() and outb() as functions. They are normally only available as
2748 * inline functions, thus cannot be called from the debugger.
2751 /* silence compiler warnings */
2752 u_char inb_(u_short);
2753 void outb_(u_short, u_char);
2762 outb_(u_short port, u_char data)