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>
69 #include <sys/eventhandler.h>
71 #include <sys/imgact.h>
73 #include <sys/kernel.h>
75 #include <sys/linker.h>
77 #include <sys/malloc.h>
78 #include <sys/memrange.h>
79 #include <sys/msgbuf.h>
80 #include <sys/mutex.h>
82 #include <sys/ptrace.h>
83 #include <sys/reboot.h>
84 #include <sys/rwlock.h>
85 #include <sys/sched.h>
86 #include <sys/signalvar.h>
90 #include <sys/syscallsubr.h>
91 #include <sys/sysctl.h>
92 #include <sys/sysent.h>
93 #include <sys/sysproto.h>
94 #include <sys/ucontext.h>
95 #include <sys/vmmeter.h>
98 #include <vm/vm_extern.h>
99 #include <vm/vm_kern.h>
100 #include <vm/vm_page.h>
101 #include <vm/vm_map.h>
102 #include <vm/vm_object.h>
103 #include <vm/vm_pager.h>
104 #include <vm/vm_param.h>
108 #error KDB must be enabled in order for DDB to work!
111 #include <ddb/db_sym.h>
114 #include <net/netisr.h>
116 #include <machine/clock.h>
117 #include <machine/cpu.h>
118 #include <machine/cputypes.h>
119 #include <machine/intr_machdep.h>
121 #include <machine/md_var.h>
122 #include <machine/metadata.h>
123 #include <machine/mp_watchdog.h>
124 #include <machine/pc/bios.h>
125 #include <machine/pcb.h>
126 #include <machine/proc.h>
127 #include <machine/reg.h>
128 #include <machine/sigframe.h>
129 #include <machine/specialreg.h>
131 #include <machine/perfmon.h>
133 #include <machine/tss.h>
135 #include <machine/smp.h>
142 #include <x86/isa/icu.h>
144 #include <machine/apicvar.h>
147 #include <isa/isareg.h>
150 /* Sanity check for __curthread() */
151 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
153 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
155 extern void printcpuinfo(void); /* XXX header file */
156 extern void identify_cpu(void);
157 extern void panicifcpuunsupported(void);
159 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
160 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
162 static void cpu_startup(void *);
163 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
164 char *xfpusave, size_t xfpusave_len);
165 static int set_fpcontext(struct thread *td, const mcontext_t *mcp,
166 char *xfpustate, size_t xfpustate_len);
167 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
170 * The file "conf/ldscript.amd64" defines the symbol "kernphys". Its value is
171 * the physical address at which the kernel is loaded.
173 extern char kernphys[];
175 extern vm_offset_t ksym_start, ksym_end;
178 struct msgbuf *msgbufp;
180 /* Intel ICH registers */
181 #define ICH_PMBASE 0x400
182 #define ICH_SMI_EN ICH_PMBASE + 0x30
184 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
192 * The number of PHYSMAP entries must be one less than the number of
193 * PHYSSEG entries because the PHYSMAP entry that spans the largest
194 * physical address that is accessible by ISA DMA is split into two
197 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
199 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
200 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
202 /* must be 2 less so 0 0 can signal end of chunks */
203 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
204 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
206 struct kva_md_info kmi;
208 static struct trapframe proc0_tf;
209 struct region_descriptor r_gdt, r_idt;
211 struct pcpu __pcpu[MAXCPU];
215 struct mem_range_softc mem_range_softc;
217 struct mtx dt_lock; /* lock for GDT and LDT */
219 void (*vmm_resume_p)(void);
229 * On MacBooks, we need to disallow the legacy USB circuit to
230 * generate an SMI# because this can cause several problems,
231 * namely: incorrect CPU frequency detection and failure to
233 * We do this by disabling a bit in the SMI_EN (SMI Control and
234 * Enable register) of the Intel ICH LPC Interface Bridge.
236 sysenv = getenv("smbios.system.product");
237 if (sysenv != NULL) {
238 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
239 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
240 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
241 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
242 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
243 strncmp(sysenv, "Macmini1,1", 10) == 0) {
245 printf("Disabling LEGACY_USB_EN bit on "
247 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
253 * Good {morning,afternoon,evening,night}.
257 panicifcpuunsupported();
263 * Display physical memory if SMBIOS reports reasonable amount.
266 sysenv = getenv("smbios.memory.enabled");
267 if (sysenv != NULL) {
268 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
271 if (memsize < ptoa((uintmax_t)cnt.v_free_count))
272 memsize = ptoa((uintmax_t)Maxmem);
273 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
274 realmem = atop(memsize);
277 * Display any holes after the first chunk of extended memory.
282 printf("Physical memory chunk(s):\n");
283 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
286 size = phys_avail[indx + 1] - phys_avail[indx];
288 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
289 (uintmax_t)phys_avail[indx],
290 (uintmax_t)phys_avail[indx + 1] - 1,
291 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
295 vm_ksubmap_init(&kmi);
297 printf("avail memory = %ju (%ju MB)\n",
298 ptoa((uintmax_t)cnt.v_free_count),
299 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
302 * Set up buffers, so they can be used to read disk labels.
305 vm_pager_bufferinit();
311 * Send an interrupt to process.
313 * Stack is set up to allow sigcode stored
314 * at top to call routine, followed by call
315 * to sigreturn routine below. After sigreturn
316 * resets the signal mask, the stack, and the
317 * frame pointer, it returns to the user
321 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
323 struct sigframe sf, *sfp;
329 struct trapframe *regs;
338 PROC_LOCK_ASSERT(p, MA_OWNED);
339 sig = ksi->ksi_signo;
341 mtx_assert(&psp->ps_mtx, MA_OWNED);
343 oonstack = sigonstack(regs->tf_rsp);
345 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
346 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
347 xfpusave = __builtin_alloca(xfpusave_len);
353 /* Save user context. */
354 bzero(&sf, sizeof(sf));
355 sf.sf_uc.uc_sigmask = *mask;
356 sf.sf_uc.uc_stack = td->td_sigstk;
357 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
358 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
359 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
360 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
361 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
362 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
364 sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase;
365 sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase;
366 bzero(sf.sf_uc.uc_mcontext.mc_spare,
367 sizeof(sf.sf_uc.uc_mcontext.mc_spare));
368 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
370 /* Allocate space for the signal handler context. */
371 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
372 SIGISMEMBER(psp->ps_sigonstack, sig)) {
373 sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
374 #if defined(COMPAT_43)
375 td->td_sigstk.ss_flags |= SS_ONSTACK;
378 sp = (char *)regs->tf_rsp - 128;
379 if (xfpusave != NULL) {
381 sp = (char *)((unsigned long)sp & ~0x3Ful);
382 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
384 sp -= sizeof(struct sigframe);
385 /* Align to 16 bytes. */
386 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
388 /* Translate the signal if appropriate. */
389 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
390 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
392 /* Build the argument list for the signal handler. */
393 regs->tf_rdi = sig; /* arg 1 in %rdi */
394 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
395 bzero(&sf.sf_si, sizeof(sf.sf_si));
396 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
397 /* Signal handler installed with SA_SIGINFO. */
398 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
399 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
401 /* Fill in POSIX parts */
402 sf.sf_si = ksi->ksi_info;
403 sf.sf_si.si_signo = sig; /* maybe a translated signal */
404 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
406 /* Old FreeBSD-style arguments. */
407 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
408 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
409 sf.sf_ahu.sf_handler = catcher;
411 mtx_unlock(&psp->ps_mtx);
415 * Copy the sigframe out to the user's stack.
417 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
418 (xfpusave != NULL && copyout(xfpusave,
419 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
422 printf("process %ld has trashed its stack\n", (long)p->p_pid);
428 regs->tf_rsp = (long)sfp;
429 regs->tf_rip = p->p_sysent->sv_sigcode_base;
430 regs->tf_rflags &= ~(PSL_T | PSL_D);
431 regs->tf_cs = _ucodesel;
432 regs->tf_ds = _udatasel;
433 regs->tf_es = _udatasel;
434 regs->tf_fs = _ufssel;
435 regs->tf_gs = _ugssel;
436 regs->tf_flags = TF_HASSEGS;
437 set_pcb_flags(pcb, PCB_FULL_IRET);
439 mtx_lock(&psp->ps_mtx);
443 * System call to cleanup state after a signal
444 * has been taken. Reset signal mask and
445 * stack state from context left by sendsig (above).
446 * Return to previous pc and psl as specified by
447 * context left by sendsig. Check carefully to
448 * make sure that the user has not modified the
449 * state to gain improper privileges.
454 sys_sigreturn(td, uap)
456 struct sigreturn_args /* {
457 const struct __ucontext *sigcntxp;
463 struct trapframe *regs;
466 size_t xfpustate_len;
474 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
476 uprintf("pid %d (%s): sigreturn copyin failed\n",
477 p->p_pid, td->td_name);
481 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
482 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
483 td->td_name, ucp->uc_mcontext.mc_flags);
487 rflags = ucp->uc_mcontext.mc_rflags;
489 * Don't allow users to change privileged or reserved flags.
491 if (!EFL_SECURE(rflags, regs->tf_rflags)) {
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)(sbintime_t) = 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(sbintime_t sbt)
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(sbintime_t sbt)
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(sbintime_t sbt)
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(sbintime_t sbt)
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)(sbintime_t) = cpu_idle_acpi;
810 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d",
813 ap_watchdog(PCPU_GET(cpuid));
815 /* If we are busy - try to use fast methods. */
817 if ((cpu_feature2 & CPUID2_MON) && idle_mwait) {
818 cpu_idle_mwait(busy);
823 /* If we have time - switch timers into idle mode. */
826 sbt = cpu_idleclock();
829 /* Apply AMD APIC timer C1E workaround. */
830 if (cpu_ident_amdc1e && cpu_disable_deep_sleep) {
831 msr = rdmsr(MSR_AMDK8_IPM);
832 if (msr & AMDK8_CMPHALT)
833 wrmsr(MSR_AMDK8_IPM, msr & ~AMDK8_CMPHALT);
836 /* Call main idle method. */
839 /* Switch timers mack into active mode. */
845 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done",
850 cpu_idle_wakeup(int cpu)
855 pcpu = pcpu_find(cpu);
856 state = (int *)pcpu->pc_monitorbuf;
858 * This doesn't need to be atomic since missing the race will
859 * simply result in unnecessary IPIs.
861 if (*state == STATE_SLEEPING)
863 if (*state == STATE_MWAIT)
864 *state = STATE_RUNNING;
869 * Ordered by speed/power consumption.
875 { cpu_idle_spin, "spin" },
876 { cpu_idle_mwait, "mwait" },
877 { cpu_idle_hlt, "hlt" },
878 { cpu_idle_acpi, "acpi" },
883 idle_sysctl_available(SYSCTL_HANDLER_ARGS)
889 avail = malloc(256, M_TEMP, M_WAITOK);
891 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
892 if (strstr(idle_tbl[i].id_name, "mwait") &&
893 (cpu_feature2 & CPUID2_MON) == 0)
895 if (strcmp(idle_tbl[i].id_name, "acpi") == 0 &&
896 cpu_idle_hook == NULL)
898 p += sprintf(p, "%s%s", p != avail ? ", " : "",
899 idle_tbl[i].id_name);
901 error = sysctl_handle_string(oidp, avail, 0, req);
906 SYSCTL_PROC(_machdep, OID_AUTO, idle_available, CTLTYPE_STRING | CTLFLAG_RD,
907 0, 0, idle_sysctl_available, "A", "list of available idle functions");
910 idle_sysctl(SYSCTL_HANDLER_ARGS)
918 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
919 if (idle_tbl[i].id_fn == cpu_idle_fn) {
920 p = idle_tbl[i].id_name;
924 strncpy(buf, p, sizeof(buf));
925 error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
926 if (error != 0 || req->newptr == NULL)
928 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
929 if (strstr(idle_tbl[i].id_name, "mwait") &&
930 (cpu_feature2 & CPUID2_MON) == 0)
932 if (strcmp(idle_tbl[i].id_name, "acpi") == 0 &&
933 cpu_idle_hook == NULL)
935 if (strcmp(idle_tbl[i].id_name, buf))
937 cpu_idle_fn = idle_tbl[i].id_fn;
943 SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
944 idle_sysctl, "A", "currently selected idle function");
947 * Reset registers to default values on exec.
950 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
952 struct trapframe *regs = td->td_frame;
953 struct pcb *pcb = td->td_pcb;
956 if (td->td_proc->p_md.md_ldt != NULL)
959 mtx_unlock(&dt_lock);
963 clear_pcb_flags(pcb, PCB_32BIT);
964 pcb->pcb_initial_fpucw = __INITIAL_FPUCW__;
965 set_pcb_flags(pcb, PCB_FULL_IRET);
967 bzero((char *)regs, sizeof(struct trapframe));
968 regs->tf_rip = imgp->entry_addr;
969 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
970 regs->tf_rdi = stack; /* argv */
971 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
972 regs->tf_ss = _udatasel;
973 regs->tf_cs = _ucodesel;
974 regs->tf_ds = _udatasel;
975 regs->tf_es = _udatasel;
976 regs->tf_fs = _ufssel;
977 regs->tf_gs = _ugssel;
978 regs->tf_flags = TF_HASSEGS;
979 td->td_retval[1] = 0;
982 * Reset the hardware debug registers if they were in use.
983 * They won't have any meaning for the newly exec'd process.
985 if (pcb->pcb_flags & PCB_DBREGS) {
994 * Clear the debug registers on the running
995 * CPU, otherwise they will end up affecting
996 * the next process we switch to.
1000 clear_pcb_flags(pcb, PCB_DBREGS);
1004 * Drop the FP state if we hold it, so that the process gets a
1005 * clean FP state if it uses the FPU again.
1017 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
1018 * BSP. See the comments there about why we set them.
1020 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
1025 * Initialize amd64 and configure to run kernel
1029 * Initialize segments & interrupt table
1032 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
1033 static struct gate_descriptor idt0[NIDT];
1034 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1036 static char dblfault_stack[PAGE_SIZE] __aligned(16);
1038 static char nmi0_stack[PAGE_SIZE] __aligned(16);
1039 CTASSERT(sizeof(struct nmi_pcpu) == 16);
1041 struct amd64tss common_tss[MAXCPU];
1044 * Software prototypes -- in more palatable form.
1046 * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same
1047 * slots as corresponding segments for i386 kernel.
1049 struct soft_segment_descriptor gdt_segs[] = {
1050 /* GNULL_SEL 0 Null Descriptor */
1059 /* GNULL2_SEL 1 Null Descriptor */
1068 /* GUFS32_SEL 2 32 bit %gs Descriptor for user */
1070 .ssd_limit = 0xfffff,
1071 .ssd_type = SDT_MEMRWA,
1077 /* GUGS32_SEL 3 32 bit %fs Descriptor for user */
1079 .ssd_limit = 0xfffff,
1080 .ssd_type = SDT_MEMRWA,
1086 /* GCODE_SEL 4 Code Descriptor for kernel */
1088 .ssd_limit = 0xfffff,
1089 .ssd_type = SDT_MEMERA,
1095 /* GDATA_SEL 5 Data Descriptor for kernel */
1097 .ssd_limit = 0xfffff,
1098 .ssd_type = SDT_MEMRWA,
1104 /* GUCODE32_SEL 6 32 bit Code Descriptor for user */
1106 .ssd_limit = 0xfffff,
1107 .ssd_type = SDT_MEMERA,
1113 /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */
1115 .ssd_limit = 0xfffff,
1116 .ssd_type = SDT_MEMRWA,
1122 /* GUCODE_SEL 8 64 bit Code Descriptor for user */
1124 .ssd_limit = 0xfffff,
1125 .ssd_type = SDT_MEMERA,
1131 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
1133 .ssd_limit = sizeof(struct amd64tss) + IOPAGES * PAGE_SIZE - 1,
1134 .ssd_type = SDT_SYSTSS,
1140 /* Actually, the TSS is a system descriptor which is double size */
1149 /* GUSERLDT_SEL 11 LDT Descriptor */
1158 /* GUSERLDT_SEL 12 LDT Descriptor, double size */
1170 setidt(idx, func, typ, dpl, ist)
1177 struct gate_descriptor *ip;
1180 ip->gd_looffset = (uintptr_t)func;
1181 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1187 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1191 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1192 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1193 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1194 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1195 IDTVEC(xmm), IDTVEC(dblfault),
1196 #ifdef KDTRACE_HOOKS
1200 IDTVEC(xen_intr_upcall),
1202 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1206 * Display the index and function name of any IDT entries that don't use
1207 * the default 'rsvd' entry point.
1209 DB_SHOW_COMMAND(idt, db_show_idt)
1211 struct gate_descriptor *ip;
1216 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1217 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
1218 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1219 db_printf("%3d\t", idx);
1220 db_printsym(func, DB_STGY_PROC);
1227 /* Show privileged registers. */
1228 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
1233 } __packed idtr, gdtr;
1236 __asm __volatile("sidt %0" : "=m" (idtr));
1237 db_printf("idtr\t0x%016lx/%04x\n",
1238 (u_long)idtr.base, (u_int)idtr.limit);
1239 __asm __volatile("sgdt %0" : "=m" (gdtr));
1240 db_printf("gdtr\t0x%016lx/%04x\n",
1241 (u_long)gdtr.base, (u_int)gdtr.limit);
1242 __asm __volatile("sldt %0" : "=r" (ldt));
1243 db_printf("ldtr\t0x%04x\n", ldt);
1244 __asm __volatile("str %0" : "=r" (tr));
1245 db_printf("tr\t0x%04x\n", tr);
1246 db_printf("cr0\t0x%016lx\n", rcr0());
1247 db_printf("cr2\t0x%016lx\n", rcr2());
1248 db_printf("cr3\t0x%016lx\n", rcr3());
1249 db_printf("cr4\t0x%016lx\n", rcr4());
1250 db_printf("EFER\t%016lx\n", rdmsr(MSR_EFER));
1251 db_printf("FEATURES_CTL\t%016lx\n", rdmsr(MSR_IA32_FEATURE_CONTROL));
1252 db_printf("DEBUG_CTL\t%016lx\n", rdmsr(MSR_DEBUGCTLMSR));
1253 db_printf("PAT\t%016lx\n", rdmsr(MSR_PAT));
1254 db_printf("GSBASE\t%016lx\n", rdmsr(MSR_GSBASE));
1260 struct user_segment_descriptor *sd;
1261 struct soft_segment_descriptor *ssd;
1264 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1265 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1266 ssd->ssd_type = sd->sd_type;
1267 ssd->ssd_dpl = sd->sd_dpl;
1268 ssd->ssd_p = sd->sd_p;
1269 ssd->ssd_long = sd->sd_long;
1270 ssd->ssd_def32 = sd->sd_def32;
1271 ssd->ssd_gran = sd->sd_gran;
1276 struct soft_segment_descriptor *ssd;
1277 struct user_segment_descriptor *sd;
1280 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1281 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1282 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1283 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1284 sd->sd_type = ssd->ssd_type;
1285 sd->sd_dpl = ssd->ssd_dpl;
1286 sd->sd_p = ssd->ssd_p;
1287 sd->sd_long = ssd->ssd_long;
1288 sd->sd_def32 = ssd->ssd_def32;
1289 sd->sd_gran = ssd->ssd_gran;
1294 struct soft_segment_descriptor *ssd;
1295 struct system_segment_descriptor *sd;
1298 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1299 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1300 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1301 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1302 sd->sd_type = ssd->ssd_type;
1303 sd->sd_dpl = ssd->ssd_dpl;
1304 sd->sd_p = ssd->ssd_p;
1305 sd->sd_gran = ssd->ssd_gran;
1308 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
1309 #include <isa/isavar.h>
1310 #include <isa/isareg.h>
1312 * Return a bitmap of the current interrupt requests. This is 8259-specific
1313 * and is only suitable for use at probe time.
1314 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
1315 * It shouldn't be here. There should probably be an APIC centric
1316 * implementation in the apic driver code, if at all.
1319 isa_irq_pending(void)
1324 irr1 = inb(IO_ICU1);
1325 irr2 = inb(IO_ICU2);
1326 return ((irr2 << 8) | irr1);
1333 add_smap_entry(struct bios_smap *smap, vm_paddr_t *physmap, int *physmap_idxp)
1335 int i, insert_idx, physmap_idx;
1337 physmap_idx = *physmap_idxp;
1339 if (boothowto & RB_VERBOSE)
1340 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1341 smap->type, smap->base, smap->length);
1343 if (smap->type != SMAP_TYPE_MEMORY)
1346 if (smap->length == 0)
1350 * Find insertion point while checking for overlap. Start off by
1351 * assuming the new entry will be added to the end.
1353 insert_idx = physmap_idx + 2;
1354 for (i = 0; i <= physmap_idx; i += 2) {
1355 if (smap->base < physmap[i + 1]) {
1356 if (smap->base + smap->length <= physmap[i]) {
1360 if (boothowto & RB_VERBOSE)
1362 "Overlapping memory regions, ignoring second region\n");
1367 /* See if we can prepend to the next entry. */
1368 if (insert_idx <= physmap_idx &&
1369 smap->base + smap->length == physmap[insert_idx]) {
1370 physmap[insert_idx] = smap->base;
1374 /* See if we can append to the previous entry. */
1375 if (insert_idx > 0 && smap->base == physmap[insert_idx - 1]) {
1376 physmap[insert_idx - 1] += smap->length;
1381 *physmap_idxp = physmap_idx;
1382 if (physmap_idx == PHYSMAP_SIZE) {
1384 "Too many segments in the physical address map, giving up\n");
1389 * Move the last 'N' entries down to make room for the new
1392 for (i = physmap_idx; i > insert_idx; i -= 2) {
1393 physmap[i] = physmap[i - 2];
1394 physmap[i + 1] = physmap[i - 1];
1397 /* Insert the new entry. */
1398 physmap[insert_idx] = smap->base;
1399 physmap[insert_idx + 1] = smap->base + smap->length;
1404 * Populate the (physmap) array with base/bound pairs describing the
1405 * available physical memory in the system, then test this memory and
1406 * build the phys_avail array describing the actually-available memory.
1408 * Total memory size may be set by the kernel environment variable
1409 * hw.physmem or the compile-time define MAXMEM.
1411 * XXX first should be vm_paddr_t.
1414 getmemsize(caddr_t kmdp, u_int64_t first)
1416 int i, physmap_idx, pa_indx, da_indx;
1417 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1418 u_long physmem_start, physmem_tunable, memtest;
1420 struct bios_smap *smapbase, *smap, *smapend;
1422 quad_t dcons_addr, dcons_size;
1424 bzero(physmap, sizeof(physmap));
1429 * get memory map from INT 15:E820, kindly supplied by the loader.
1431 * subr_module.c says:
1432 * "Consumer may safely assume that size value precedes data."
1433 * ie: an int32_t immediately precedes smap.
1435 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1436 MODINFO_METADATA | MODINFOMD_SMAP);
1437 if (smapbase == NULL)
1438 panic("No BIOS smap info from loader!");
1440 smapsize = *((u_int32_t *)smapbase - 1);
1441 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1443 for (smap = smapbase; smap < smapend; smap++)
1444 if (!add_smap_entry(smap, physmap, &physmap_idx))
1448 * Find the 'base memory' segment for SMP
1451 for (i = 0; i <= physmap_idx; i += 2) {
1452 if (physmap[i] == 0x00000000) {
1453 basemem = physmap[i + 1] / 1024;
1458 panic("BIOS smap did not include a basemem segment!");
1461 /* make hole for AP bootstrap code */
1462 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1466 * Maxmem isn't the "maximum memory", it's one larger than the
1467 * highest page of the physical address space. It should be
1468 * called something like "Maxphyspage". We may adjust this
1469 * based on ``hw.physmem'' and the results of the memory test.
1471 Maxmem = atop(physmap[physmap_idx + 1]);
1474 Maxmem = MAXMEM / 4;
1477 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1478 Maxmem = atop(physmem_tunable);
1481 * By default enable the memory test on real hardware, and disable
1482 * it if we appear to be running in a VM. This avoids touching all
1483 * pages unnecessarily, which doesn't matter on real hardware but is
1484 * bad for shared VM hosts. Use a general name so that
1485 * one could eventually do more with the code than just disable it.
1487 memtest = (vm_guest > VM_GUEST_NO) ? 0 : 1;
1488 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
1491 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1494 if (Maxmem > atop(physmap[physmap_idx + 1]))
1495 Maxmem = atop(physmap[physmap_idx + 1]);
1497 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1498 (boothowto & RB_VERBOSE))
1499 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1501 /* call pmap initialization to make new kernel address space */
1502 pmap_bootstrap(&first);
1505 * Size up each available chunk of physical memory.
1507 * XXX Some BIOSes corrupt low 64KB between suspend and resume.
1508 * By default, mask off the first 16 pages unless we appear to be
1511 physmem_start = (vm_guest > VM_GUEST_NO ? 1 : 16) << PAGE_SHIFT;
1512 TUNABLE_ULONG_FETCH("hw.physmem.start", &physmem_start);
1513 if (physmem_start < PAGE_SIZE)
1514 physmap[0] = PAGE_SIZE;
1515 else if (physmem_start >= physmap[1])
1516 physmap[0] = round_page(physmap[1] - PAGE_SIZE);
1518 physmap[0] = round_page(physmem_start);
1521 phys_avail[pa_indx++] = physmap[0];
1522 phys_avail[pa_indx] = physmap[0];
1523 dump_avail[da_indx] = physmap[0];
1527 * Get dcons buffer address
1529 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1530 getenv_quad("dcons.size", &dcons_size) == 0)
1534 * physmap is in bytes, so when converting to page boundaries,
1535 * round up the start address and round down the end address.
1537 for (i = 0; i <= physmap_idx; i += 2) {
1540 end = ptoa((vm_paddr_t)Maxmem);
1541 if (physmap[i + 1] < end)
1542 end = trunc_page(physmap[i + 1]);
1543 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1544 int tmp, page_bad, full;
1545 int *ptr = (int *)CADDR1;
1549 * block out kernel memory as not available.
1551 if (pa >= (vm_paddr_t)kernphys && pa < first)
1555 * block out dcons buffer
1558 && pa >= trunc_page(dcons_addr)
1559 && pa < dcons_addr + dcons_size)
1567 * map page into kernel: valid, read/write,non-cacheable
1569 *pte = pa | PG_V | PG_RW | PG_NC_PWT | PG_NC_PCD;
1574 * Test for alternating 1's and 0's
1576 *(volatile int *)ptr = 0xaaaaaaaa;
1577 if (*(volatile int *)ptr != 0xaaaaaaaa)
1580 * Test for alternating 0's and 1's
1582 *(volatile int *)ptr = 0x55555555;
1583 if (*(volatile int *)ptr != 0x55555555)
1588 *(volatile int *)ptr = 0xffffffff;
1589 if (*(volatile int *)ptr != 0xffffffff)
1594 *(volatile int *)ptr = 0x0;
1595 if (*(volatile int *)ptr != 0x0)
1598 * Restore original value.
1604 * Adjust array of valid/good pages.
1606 if (page_bad == TRUE)
1609 * If this good page is a continuation of the
1610 * previous set of good pages, then just increase
1611 * the end pointer. Otherwise start a new chunk.
1612 * Note that "end" points one higher than end,
1613 * making the range >= start and < end.
1614 * If we're also doing a speculative memory
1615 * test and we at or past the end, bump up Maxmem
1616 * so that we keep going. The first bad page
1617 * will terminate the loop.
1619 if (phys_avail[pa_indx] == pa) {
1620 phys_avail[pa_indx] += PAGE_SIZE;
1623 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1625 "Too many holes in the physical address space, giving up\n");
1630 phys_avail[pa_indx++] = pa; /* start */
1631 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1635 if (dump_avail[da_indx] == pa) {
1636 dump_avail[da_indx] += PAGE_SIZE;
1639 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1643 dump_avail[da_indx++] = pa; /* start */
1644 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1656 * The last chunk must contain at least one page plus the message
1657 * buffer to avoid complicating other code (message buffer address
1658 * calculation, etc.).
1660 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1661 round_page(msgbufsize) >= phys_avail[pa_indx]) {
1662 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1663 phys_avail[pa_indx--] = 0;
1664 phys_avail[pa_indx--] = 0;
1667 Maxmem = atop(phys_avail[pa_indx]);
1669 /* Trim off space for the message buffer. */
1670 phys_avail[pa_indx] -= round_page(msgbufsize);
1672 /* Map the message buffer. */
1673 msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
1677 hammer_time(u_int64_t modulep, u_int64_t physfree)
1682 struct nmi_pcpu *np;
1683 struct xstate_hdr *xhdr;
1688 thread0.td_kstack = physfree + KERNBASE;
1689 thread0.td_kstack_pages = KSTACK_PAGES;
1690 kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
1691 bzero((void *)thread0.td_kstack, kstack0_sz);
1692 physfree += kstack0_sz;
1695 * This may be done better later if it gets more high level
1696 * components in it. If so just link td->td_proc here.
1698 proc_linkup0(&proc0, &thread0);
1700 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1701 preload_bootstrap_relocate(KERNBASE);
1702 kmdp = preload_search_by_type("elf kernel");
1704 kmdp = preload_search_by_type("elf64 kernel");
1705 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1706 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1708 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1709 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1712 /* Init basic tunables, hz etc */
1716 * make gdt memory segments
1718 for (x = 0; x < NGDT; x++) {
1719 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1720 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1721 ssdtosd(&gdt_segs[x], &gdt[x]);
1723 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1724 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1725 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1727 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1728 r_gdt.rd_base = (long) gdt;
1732 wrmsr(MSR_FSBASE, 0); /* User value */
1733 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1734 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1736 pcpu_init(pc, 0, sizeof(struct pcpu));
1737 dpcpu_init((void *)(physfree + KERNBASE), 0);
1738 physfree += DPCPU_SIZE;
1739 PCPU_SET(prvspace, pc);
1740 PCPU_SET(curthread, &thread0);
1741 PCPU_SET(tssp, &common_tss[0]);
1742 PCPU_SET(commontssp, &common_tss[0]);
1743 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1744 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1745 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1746 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1749 * Initialize mutexes.
1751 * icu_lock: in order to allow an interrupt to occur in a critical
1752 * section, to set pcpu->ipending (etc...) properly, we
1753 * must be able to get the icu lock, so it can't be
1757 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1758 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1761 for (x = 0; x < NIDT; x++)
1762 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1763 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1764 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1765 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1766 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1767 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1768 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1769 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1770 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1771 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1772 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1773 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1774 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1775 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1776 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1777 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1778 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1779 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1780 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1781 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1782 #ifdef KDTRACE_HOOKS
1783 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
1786 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall), SDT_SYSIGT, SEL_UPL, 0);
1789 r_idt.rd_limit = sizeof(idt0) - 1;
1790 r_idt.rd_base = (long) idt;
1794 * Initialize the i8254 before the console so that console
1795 * initialization can use DELAY().
1800 * Initialize the console before we print anything out.
1809 /* Reset and mask the atpics and leave them shut down. */
1813 * Point the ICU spurious interrupt vectors at the APIC spurious
1814 * interrupt handler.
1816 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1817 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1820 #error "have you forgotten the isa device?";
1826 if (boothowto & RB_KDB)
1827 kdb_enter(KDB_WHY_BOOTFLAGS,
1828 "Boot flags requested debugger");
1831 identify_cpu(); /* Final stage of CPU initialization */
1832 initializecpu(); /* Initialize CPU registers */
1833 initializecpucache();
1835 /* doublefault stack space, runs on ist1 */
1836 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1839 * NMI stack, runs on ist2. The pcpu pointer is stored just
1840 * above the start of the ist2 stack.
1842 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1843 np->np_pcpu = (register_t) pc;
1844 common_tss[0].tss_ist2 = (long) np;
1846 /* Set the IO permission bitmap (empty due to tss seg limit) */
1847 common_tss[0].tss_iobase = sizeof(struct amd64tss) +
1848 IOPAGES * PAGE_SIZE;
1850 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1853 /* Set up the fast syscall stuff */
1854 msr = rdmsr(MSR_EFER) | EFER_SCE;
1855 wrmsr(MSR_EFER, msr);
1856 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1857 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1858 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1859 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1860 wrmsr(MSR_STAR, msr);
1861 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1863 getmemsize(kmdp, physfree);
1864 init_param2(physmem);
1866 /* now running on new page tables, configured,and u/iom is accessible */
1868 msgbufinit(msgbufp, msgbufsize);
1872 * Set up thread0 pcb after fpuinit calculated pcb + fpu save
1873 * area size. Zero out the extended state header in fpu save
1876 thread0.td_pcb = get_pcb_td(&thread0);
1877 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
1879 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
1881 xhdr->xstate_bv = xsave_mask;
1883 /* make an initial tss so cpu can get interrupt stack on syscall! */
1884 common_tss[0].tss_rsp0 = (vm_offset_t)thread0.td_pcb;
1885 /* Ensure the stack is aligned to 16 bytes */
1886 common_tss[0].tss_rsp0 &= ~0xFul;
1887 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1888 PCPU_SET(curpcb, thread0.td_pcb);
1890 /* transfer to user mode */
1892 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1893 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1894 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1895 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
1896 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
1902 /* setup proc 0's pcb */
1903 thread0.td_pcb->pcb_flags = 0;
1904 thread0.td_pcb->pcb_cr3 = KPML4phys; /* PCID 0 is reserved for kernel */
1905 thread0.td_frame = &proc0_tf;
1907 env = getenv("kernelname");
1909 strlcpy(kernelname, env, sizeof(kernelname));
1917 /* Location of kernel stack for locore */
1918 return ((u_int64_t)thread0.td_pcb);
1922 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1925 pcpu->pc_acpi_id = 0xffffffff;
1929 spinlock_enter(void)
1935 if (td->td_md.md_spinlock_count == 0) {
1936 flags = intr_disable();
1937 td->td_md.md_spinlock_count = 1;
1938 td->td_md.md_saved_flags = flags;
1940 td->td_md.md_spinlock_count++;
1952 flags = td->td_md.md_saved_flags;
1953 td->td_md.md_spinlock_count--;
1954 if (td->td_md.md_spinlock_count == 0)
1955 intr_restore(flags);
1959 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1960 * we want to start a backtrace from the function that caused us to enter
1961 * the debugger. We have the context in the trapframe, but base the trace
1962 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1963 * enough for a backtrace.
1966 makectx(struct trapframe *tf, struct pcb *pcb)
1969 pcb->pcb_r12 = tf->tf_r12;
1970 pcb->pcb_r13 = tf->tf_r13;
1971 pcb->pcb_r14 = tf->tf_r14;
1972 pcb->pcb_r15 = tf->tf_r15;
1973 pcb->pcb_rbp = tf->tf_rbp;
1974 pcb->pcb_rbx = tf->tf_rbx;
1975 pcb->pcb_rip = tf->tf_rip;
1976 pcb->pcb_rsp = tf->tf_rsp;
1980 ptrace_set_pc(struct thread *td, unsigned long addr)
1982 td->td_frame->tf_rip = addr;
1987 ptrace_single_step(struct thread *td)
1989 td->td_frame->tf_rflags |= PSL_T;
1994 ptrace_clear_single_step(struct thread *td)
1996 td->td_frame->tf_rflags &= ~PSL_T;
2001 fill_regs(struct thread *td, struct reg *regs)
2003 struct trapframe *tp;
2006 return (fill_frame_regs(tp, regs));
2010 fill_frame_regs(struct trapframe *tp, struct reg *regs)
2012 regs->r_r15 = tp->tf_r15;
2013 regs->r_r14 = tp->tf_r14;
2014 regs->r_r13 = tp->tf_r13;
2015 regs->r_r12 = tp->tf_r12;
2016 regs->r_r11 = tp->tf_r11;
2017 regs->r_r10 = tp->tf_r10;
2018 regs->r_r9 = tp->tf_r9;
2019 regs->r_r8 = tp->tf_r8;
2020 regs->r_rdi = tp->tf_rdi;
2021 regs->r_rsi = tp->tf_rsi;
2022 regs->r_rbp = tp->tf_rbp;
2023 regs->r_rbx = tp->tf_rbx;
2024 regs->r_rdx = tp->tf_rdx;
2025 regs->r_rcx = tp->tf_rcx;
2026 regs->r_rax = tp->tf_rax;
2027 regs->r_rip = tp->tf_rip;
2028 regs->r_cs = tp->tf_cs;
2029 regs->r_rflags = tp->tf_rflags;
2030 regs->r_rsp = tp->tf_rsp;
2031 regs->r_ss = tp->tf_ss;
2032 if (tp->tf_flags & TF_HASSEGS) {
2033 regs->r_ds = tp->tf_ds;
2034 regs->r_es = tp->tf_es;
2035 regs->r_fs = tp->tf_fs;
2036 regs->r_gs = tp->tf_gs;
2047 set_regs(struct thread *td, struct reg *regs)
2049 struct trapframe *tp;
2053 rflags = regs->r_rflags & 0xffffffff;
2054 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
2056 tp->tf_r15 = regs->r_r15;
2057 tp->tf_r14 = regs->r_r14;
2058 tp->tf_r13 = regs->r_r13;
2059 tp->tf_r12 = regs->r_r12;
2060 tp->tf_r11 = regs->r_r11;
2061 tp->tf_r10 = regs->r_r10;
2062 tp->tf_r9 = regs->r_r9;
2063 tp->tf_r8 = regs->r_r8;
2064 tp->tf_rdi = regs->r_rdi;
2065 tp->tf_rsi = regs->r_rsi;
2066 tp->tf_rbp = regs->r_rbp;
2067 tp->tf_rbx = regs->r_rbx;
2068 tp->tf_rdx = regs->r_rdx;
2069 tp->tf_rcx = regs->r_rcx;
2070 tp->tf_rax = regs->r_rax;
2071 tp->tf_rip = regs->r_rip;
2072 tp->tf_cs = regs->r_cs;
2073 tp->tf_rflags = rflags;
2074 tp->tf_rsp = regs->r_rsp;
2075 tp->tf_ss = regs->r_ss;
2076 if (0) { /* XXXKIB */
2077 tp->tf_ds = regs->r_ds;
2078 tp->tf_es = regs->r_es;
2079 tp->tf_fs = regs->r_fs;
2080 tp->tf_gs = regs->r_gs;
2081 tp->tf_flags = TF_HASSEGS;
2082 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
2087 /* XXX check all this stuff! */
2088 /* externalize from sv_xmm */
2090 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
2092 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2093 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2097 bzero(fpregs, sizeof(*fpregs));
2099 /* FPU control/status */
2100 penv_fpreg->en_cw = penv_xmm->en_cw;
2101 penv_fpreg->en_sw = penv_xmm->en_sw;
2102 penv_fpreg->en_tw = penv_xmm->en_tw;
2103 penv_fpreg->en_opcode = penv_xmm->en_opcode;
2104 penv_fpreg->en_rip = penv_xmm->en_rip;
2105 penv_fpreg->en_rdp = penv_xmm->en_rdp;
2106 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
2107 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
2110 for (i = 0; i < 8; ++i)
2111 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
2114 for (i = 0; i < 16; ++i)
2115 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
2118 /* internalize from fpregs into sv_xmm */
2120 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
2122 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2123 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2127 /* FPU control/status */
2128 penv_xmm->en_cw = penv_fpreg->en_cw;
2129 penv_xmm->en_sw = penv_fpreg->en_sw;
2130 penv_xmm->en_tw = penv_fpreg->en_tw;
2131 penv_xmm->en_opcode = penv_fpreg->en_opcode;
2132 penv_xmm->en_rip = penv_fpreg->en_rip;
2133 penv_xmm->en_rdp = penv_fpreg->en_rdp;
2134 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
2135 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
2138 for (i = 0; i < 8; ++i)
2139 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
2142 for (i = 0; i < 16; ++i)
2143 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
2146 /* externalize from td->pcb */
2148 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2151 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2152 P_SHOULDSTOP(td->td_proc),
2153 ("not suspended thread %p", td));
2155 fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs);
2159 /* internalize to td->pcb */
2161 set_fpregs(struct thread *td, struct fpreg *fpregs)
2164 set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
2170 * Get machine context.
2173 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2176 struct trapframe *tp;
2180 PROC_LOCK(curthread->td_proc);
2181 mcp->mc_onstack = sigonstack(tp->tf_rsp);
2182 PROC_UNLOCK(curthread->td_proc);
2183 mcp->mc_r15 = tp->tf_r15;
2184 mcp->mc_r14 = tp->tf_r14;
2185 mcp->mc_r13 = tp->tf_r13;
2186 mcp->mc_r12 = tp->tf_r12;
2187 mcp->mc_r11 = tp->tf_r11;
2188 mcp->mc_r10 = tp->tf_r10;
2189 mcp->mc_r9 = tp->tf_r9;
2190 mcp->mc_r8 = tp->tf_r8;
2191 mcp->mc_rdi = tp->tf_rdi;
2192 mcp->mc_rsi = tp->tf_rsi;
2193 mcp->mc_rbp = tp->tf_rbp;
2194 mcp->mc_rbx = tp->tf_rbx;
2195 mcp->mc_rcx = tp->tf_rcx;
2196 mcp->mc_rflags = tp->tf_rflags;
2197 if (flags & GET_MC_CLEAR_RET) {
2200 mcp->mc_rflags &= ~PSL_C;
2202 mcp->mc_rax = tp->tf_rax;
2203 mcp->mc_rdx = tp->tf_rdx;
2205 mcp->mc_rip = tp->tf_rip;
2206 mcp->mc_cs = tp->tf_cs;
2207 mcp->mc_rsp = tp->tf_rsp;
2208 mcp->mc_ss = tp->tf_ss;
2209 mcp->mc_ds = tp->tf_ds;
2210 mcp->mc_es = tp->tf_es;
2211 mcp->mc_fs = tp->tf_fs;
2212 mcp->mc_gs = tp->tf_gs;
2213 mcp->mc_flags = tp->tf_flags;
2214 mcp->mc_len = sizeof(*mcp);
2215 get_fpcontext(td, mcp, NULL, 0);
2216 mcp->mc_fsbase = pcb->pcb_fsbase;
2217 mcp->mc_gsbase = pcb->pcb_gsbase;
2218 mcp->mc_xfpustate = 0;
2219 mcp->mc_xfpustate_len = 0;
2220 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
2225 * Set machine context.
2227 * However, we don't set any but the user modifiable flags, and we won't
2228 * touch the cs selector.
2231 set_mcontext(struct thread *td, const mcontext_t *mcp)
2234 struct trapframe *tp;
2241 if (mcp->mc_len != sizeof(*mcp) ||
2242 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2244 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2245 (tp->tf_rflags & ~PSL_USERCHANGE);
2246 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2247 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2248 sizeof(struct savefpu))
2250 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2251 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2252 mcp->mc_xfpustate_len);
2257 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2260 tp->tf_r15 = mcp->mc_r15;
2261 tp->tf_r14 = mcp->mc_r14;
2262 tp->tf_r13 = mcp->mc_r13;
2263 tp->tf_r12 = mcp->mc_r12;
2264 tp->tf_r11 = mcp->mc_r11;
2265 tp->tf_r10 = mcp->mc_r10;
2266 tp->tf_r9 = mcp->mc_r9;
2267 tp->tf_r8 = mcp->mc_r8;
2268 tp->tf_rdi = mcp->mc_rdi;
2269 tp->tf_rsi = mcp->mc_rsi;
2270 tp->tf_rbp = mcp->mc_rbp;
2271 tp->tf_rbx = mcp->mc_rbx;
2272 tp->tf_rdx = mcp->mc_rdx;
2273 tp->tf_rcx = mcp->mc_rcx;
2274 tp->tf_rax = mcp->mc_rax;
2275 tp->tf_rip = mcp->mc_rip;
2276 tp->tf_rflags = rflags;
2277 tp->tf_rsp = mcp->mc_rsp;
2278 tp->tf_ss = mcp->mc_ss;
2279 tp->tf_flags = mcp->mc_flags;
2280 if (tp->tf_flags & TF_HASSEGS) {
2281 tp->tf_ds = mcp->mc_ds;
2282 tp->tf_es = mcp->mc_es;
2283 tp->tf_fs = mcp->mc_fs;
2284 tp->tf_gs = mcp->mc_gs;
2286 if (mcp->mc_flags & _MC_HASBASES) {
2287 pcb->pcb_fsbase = mcp->mc_fsbase;
2288 pcb->pcb_gsbase = mcp->mc_gsbase;
2290 set_pcb_flags(pcb, PCB_FULL_IRET);
2295 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2296 size_t xfpusave_len)
2298 size_t max_len, len;
2300 mcp->mc_ownedfp = fpugetregs(td);
2301 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
2302 sizeof(mcp->mc_fpstate));
2303 mcp->mc_fpformat = fpuformat();
2304 if (!use_xsave || xfpusave_len == 0)
2306 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
2308 if (len > max_len) {
2310 bzero(xfpusave + max_len, len - max_len);
2312 mcp->mc_flags |= _MC_HASFPXSTATE;
2313 mcp->mc_xfpustate_len = len;
2314 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
2318 set_fpcontext(struct thread *td, const mcontext_t *mcp, char *xfpustate,
2319 size_t xfpustate_len)
2321 struct savefpu *fpstate;
2324 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2326 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2328 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
2329 /* We don't care what state is left in the FPU or PCB. */
2332 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2333 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2334 fpstate = (struct savefpu *)&mcp->mc_fpstate;
2335 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
2336 error = fpusetregs(td, fpstate, xfpustate, xfpustate_len);
2343 fpstate_drop(struct thread *td)
2346 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
2348 if (PCPU_GET(fpcurthread) == td)
2351 * XXX force a full drop of the fpu. The above only drops it if we
2354 * XXX I don't much like fpugetuserregs()'s semantics of doing a full
2355 * drop. Dropping only to the pcb matches fnsave's behaviour.
2356 * We only need to drop to !PCB_INITDONE in sendsig(). But
2357 * sendsig() is the only caller of fpugetuserregs()... perhaps we just
2358 * have too many layers.
2360 clear_pcb_flags(curthread->td_pcb,
2361 PCB_FPUINITDONE | PCB_USERFPUINITDONE);
2366 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2371 dbregs->dr[0] = rdr0();
2372 dbregs->dr[1] = rdr1();
2373 dbregs->dr[2] = rdr2();
2374 dbregs->dr[3] = rdr3();
2375 dbregs->dr[6] = rdr6();
2376 dbregs->dr[7] = rdr7();
2379 dbregs->dr[0] = pcb->pcb_dr0;
2380 dbregs->dr[1] = pcb->pcb_dr1;
2381 dbregs->dr[2] = pcb->pcb_dr2;
2382 dbregs->dr[3] = pcb->pcb_dr3;
2383 dbregs->dr[6] = pcb->pcb_dr6;
2384 dbregs->dr[7] = pcb->pcb_dr7;
2400 set_dbregs(struct thread *td, struct dbreg *dbregs)
2406 load_dr0(dbregs->dr[0]);
2407 load_dr1(dbregs->dr[1]);
2408 load_dr2(dbregs->dr[2]);
2409 load_dr3(dbregs->dr[3]);
2410 load_dr6(dbregs->dr[6]);
2411 load_dr7(dbregs->dr[7]);
2414 * Don't let an illegal value for dr7 get set. Specifically,
2415 * check for undefined settings. Setting these bit patterns
2416 * result in undefined behaviour and can lead to an unexpected
2417 * TRCTRAP or a general protection fault right here.
2418 * Upper bits of dr6 and dr7 must not be set
2420 for (i = 0; i < 4; i++) {
2421 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2423 if (td->td_frame->tf_cs == _ucode32sel &&
2424 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2427 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2428 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2434 * Don't let a process set a breakpoint that is not within the
2435 * process's address space. If a process could do this, it
2436 * could halt the system by setting a breakpoint in the kernel
2437 * (if ddb was enabled). Thus, we need to check to make sure
2438 * that no breakpoints are being enabled for addresses outside
2439 * process's address space.
2441 * XXX - what about when the watched area of the user's
2442 * address space is written into from within the kernel
2443 * ... wouldn't that still cause a breakpoint to be generated
2444 * from within kernel mode?
2447 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2448 /* dr0 is enabled */
2449 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2452 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2453 /* dr1 is enabled */
2454 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2457 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2458 /* dr2 is enabled */
2459 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2462 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2463 /* dr3 is enabled */
2464 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2468 pcb->pcb_dr0 = dbregs->dr[0];
2469 pcb->pcb_dr1 = dbregs->dr[1];
2470 pcb->pcb_dr2 = dbregs->dr[2];
2471 pcb->pcb_dr3 = dbregs->dr[3];
2472 pcb->pcb_dr6 = dbregs->dr[6];
2473 pcb->pcb_dr7 = dbregs->dr[7];
2475 set_pcb_flags(pcb, PCB_DBREGS);
2485 load_dr7(0); /* Turn off the control bits first */
2494 * Return > 0 if a hardware breakpoint has been hit, and the
2495 * breakpoint was in user space. Return 0, otherwise.
2498 user_dbreg_trap(void)
2500 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2501 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2502 int nbp; /* number of breakpoints that triggered */
2503 caddr_t addr[4]; /* breakpoint addresses */
2507 if ((dr7 & 0x000000ff) == 0) {
2509 * all GE and LE bits in the dr7 register are zero,
2510 * thus the trap couldn't have been caused by the
2511 * hardware debug registers
2518 bp = dr6 & 0x0000000f;
2522 * None of the breakpoint bits are set meaning this
2523 * trap was not caused by any of the debug registers
2529 * at least one of the breakpoints were hit, check to see
2530 * which ones and if any of them are user space addresses
2534 addr[nbp++] = (caddr_t)rdr0();
2537 addr[nbp++] = (caddr_t)rdr1();
2540 addr[nbp++] = (caddr_t)rdr2();
2543 addr[nbp++] = (caddr_t)rdr3();
2546 for (i = 0; i < nbp; i++) {
2547 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2549 * addr[i] is in user space
2556 * None of the breakpoints are in user space.
2564 * Provide inb() and outb() as functions. They are normally only available as
2565 * inline functions, thus cannot be called from the debugger.
2568 /* silence compiler warnings */
2569 u_char inb_(u_short);
2570 void outb_(u_short, u_char);
2579 outb_(u_short port, u_char data)