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_atpic.h"
45 #include "opt_compat.h"
50 #include "opt_kstack_pages.h"
51 #include "opt_maxmem.h"
52 #include "opt_mp_watchdog.h"
53 #include "opt_perfmon.h"
54 #include "opt_platform.h"
55 #include "opt_sched.h"
57 #include <sys/param.h>
59 #include <sys/systm.h>
63 #include <sys/callout.h>
67 #include <sys/eventhandler.h>
69 #include <sys/imgact.h>
71 #include <sys/kernel.h>
73 #include <sys/linker.h>
75 #include <sys/malloc.h>
76 #include <sys/memrange.h>
77 #include <sys/msgbuf.h>
78 #include <sys/mutex.h>
80 #include <sys/ptrace.h>
81 #include <sys/reboot.h>
82 #include <sys/rwlock.h>
83 #include <sys/sched.h>
84 #include <sys/signalvar.h>
88 #include <sys/syscallsubr.h>
89 #include <sys/sysctl.h>
90 #include <sys/sysent.h>
91 #include <sys/sysproto.h>
92 #include <sys/ucontext.h>
93 #include <sys/vmmeter.h>
96 #include <vm/vm_extern.h>
97 #include <vm/vm_kern.h>
98 #include <vm/vm_page.h>
99 #include <vm/vm_map.h>
100 #include <vm/vm_object.h>
101 #include <vm/vm_pager.h>
102 #include <vm/vm_param.h>
106 #error KDB must be enabled in order for DDB to work!
109 #include <ddb/db_sym.h>
112 #include <net/netisr.h>
114 #include <machine/clock.h>
115 #include <machine/cpu.h>
116 #include <machine/cputypes.h>
117 #include <machine/intr_machdep.h>
119 #include <machine/md_var.h>
120 #include <machine/metadata.h>
121 #include <machine/mp_watchdog.h>
122 #include <machine/pc/bios.h>
123 #include <machine/pcb.h>
124 #include <machine/proc.h>
125 #include <machine/reg.h>
126 #include <machine/sigframe.h>
127 #include <machine/specialreg.h>
129 #include <machine/perfmon.h>
131 #include <machine/tss.h>
133 #include <machine/smp.h>
140 #include <x86/isa/icu.h>
142 #include <x86/apicvar.h>
145 #include <isa/isareg.h>
147 #include <x86/init.h>
149 /* Sanity check for __curthread() */
150 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
152 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
154 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
155 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
157 static void cpu_startup(void *);
158 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
159 char *xfpusave, size_t xfpusave_len);
160 static int set_fpcontext(struct thread *td, mcontext_t *mcp,
161 char *xfpustate, size_t xfpustate_len);
162 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
164 /* Preload data parse function */
165 static caddr_t native_parse_preload_data(u_int64_t);
167 /* Native function to fetch and parse the e820 map */
168 static void native_parse_memmap(caddr_t, vm_paddr_t *, int *);
170 /* Default init_ops implementation. */
171 struct init_ops init_ops = {
172 .parse_preload_data = native_parse_preload_data,
173 .early_clock_source_init = i8254_init,
174 .early_delay = i8254_delay,
175 .parse_memmap = native_parse_memmap,
177 .mp_bootaddress = mp_bootaddress,
178 .start_all_aps = native_start_all_aps,
180 .msi_init = msi_init,
184 * The file "conf/ldscript.amd64" defines the symbol "kernphys". Its value is
185 * the physical address at which the kernel is loaded.
187 extern char kernphys[];
189 struct msgbuf *msgbufp;
191 /* Intel ICH registers */
192 #define ICH_PMBASE 0x400
193 #define ICH_SMI_EN ICH_PMBASE + 0x30
195 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
203 * The number of PHYSMAP entries must be one less than the number of
204 * PHYSSEG entries because the PHYSMAP entry that spans the largest
205 * physical address that is accessible by ISA DMA is split into two
208 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
210 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
211 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
213 /* must be 2 less so 0 0 can signal end of chunks */
214 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
215 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
217 struct kva_md_info kmi;
219 static struct trapframe proc0_tf;
220 struct region_descriptor r_gdt, r_idt;
222 struct pcpu __pcpu[MAXCPU];
226 struct mem_range_softc mem_range_softc;
228 struct mtx dt_lock; /* lock for GDT and LDT */
230 void (*vmm_resume_p)(void);
240 * On MacBooks, we need to disallow the legacy USB circuit to
241 * generate an SMI# because this can cause several problems,
242 * namely: incorrect CPU frequency detection and failure to
244 * We do this by disabling a bit in the SMI_EN (SMI Control and
245 * Enable register) of the Intel ICH LPC Interface Bridge.
247 sysenv = kern_getenv("smbios.system.product");
248 if (sysenv != NULL) {
249 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
250 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
251 strncmp(sysenv, "MacBook4,1", 10) == 0 ||
252 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
253 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
254 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
255 strncmp(sysenv, "MacBookPro4,1", 13) == 0 ||
256 strncmp(sysenv, "Macmini1,1", 10) == 0) {
258 printf("Disabling LEGACY_USB_EN bit on "
260 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
266 * Good {morning,afternoon,evening,night}.
270 panicifcpuunsupported();
276 * Display physical memory if SMBIOS reports reasonable amount.
279 sysenv = kern_getenv("smbios.memory.enabled");
280 if (sysenv != NULL) {
281 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
284 if (memsize < ptoa((uintmax_t)vm_cnt.v_free_count))
285 memsize = ptoa((uintmax_t)Maxmem);
286 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
287 realmem = atop(memsize);
290 * Display any holes after the first chunk of extended memory.
295 printf("Physical memory chunk(s):\n");
296 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
299 size = phys_avail[indx + 1] - phys_avail[indx];
301 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
302 (uintmax_t)phys_avail[indx],
303 (uintmax_t)phys_avail[indx + 1] - 1,
304 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
308 vm_ksubmap_init(&kmi);
310 printf("avail memory = %ju (%ju MB)\n",
311 ptoa((uintmax_t)vm_cnt.v_free_count),
312 ptoa((uintmax_t)vm_cnt.v_free_count) / 1048576);
315 * Set up buffers, so they can be used to read disk labels.
318 vm_pager_bufferinit();
324 * Send an interrupt to process.
326 * Stack is set up to allow sigcode stored
327 * at top to call routine, followed by call
328 * to sigreturn routine below. After sigreturn
329 * resets the signal mask, the stack, and the
330 * frame pointer, it returns to the user
334 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
336 struct sigframe sf, *sfp;
342 struct trapframe *regs;
351 PROC_LOCK_ASSERT(p, MA_OWNED);
352 sig = ksi->ksi_signo;
354 mtx_assert(&psp->ps_mtx, MA_OWNED);
356 oonstack = sigonstack(regs->tf_rsp);
358 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
359 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
360 xfpusave = __builtin_alloca(xfpusave_len);
366 /* Save user context. */
367 bzero(&sf, sizeof(sf));
368 sf.sf_uc.uc_sigmask = *mask;
369 sf.sf_uc.uc_stack = td->td_sigstk;
370 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
371 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
372 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
373 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
374 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
375 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
377 sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase;
378 sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase;
379 bzero(sf.sf_uc.uc_mcontext.mc_spare,
380 sizeof(sf.sf_uc.uc_mcontext.mc_spare));
381 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
383 /* Allocate space for the signal handler context. */
384 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
385 SIGISMEMBER(psp->ps_sigonstack, sig)) {
386 sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
387 #if defined(COMPAT_43)
388 td->td_sigstk.ss_flags |= SS_ONSTACK;
391 sp = (char *)regs->tf_rsp - 128;
392 if (xfpusave != NULL) {
394 sp = (char *)((unsigned long)sp & ~0x3Ful);
395 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
397 sp -= sizeof(struct sigframe);
398 /* Align to 16 bytes. */
399 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
401 /* Build the argument list for the signal handler. */
402 regs->tf_rdi = sig; /* arg 1 in %rdi */
403 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
404 bzero(&sf.sf_si, sizeof(sf.sf_si));
405 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
406 /* Signal handler installed with SA_SIGINFO. */
407 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
408 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
410 /* Fill in POSIX parts */
411 sf.sf_si = ksi->ksi_info;
412 sf.sf_si.si_signo = sig; /* maybe a translated signal */
413 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
415 /* Old FreeBSD-style arguments. */
416 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
417 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
418 sf.sf_ahu.sf_handler = catcher;
420 mtx_unlock(&psp->ps_mtx);
424 * Copy the sigframe out to the user's stack.
426 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
427 (xfpusave != NULL && copyout(xfpusave,
428 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
431 printf("process %ld has trashed its stack\n", (long)p->p_pid);
437 regs->tf_rsp = (long)sfp;
438 regs->tf_rip = p->p_sysent->sv_sigcode_base;
439 regs->tf_rflags &= ~(PSL_T | PSL_D);
440 regs->tf_cs = _ucodesel;
441 regs->tf_ds = _udatasel;
442 regs->tf_ss = _udatasel;
443 regs->tf_es = _udatasel;
444 regs->tf_fs = _ufssel;
445 regs->tf_gs = _ugssel;
446 regs->tf_flags = TF_HASSEGS;
447 set_pcb_flags(pcb, PCB_FULL_IRET);
449 mtx_lock(&psp->ps_mtx);
453 * System call to cleanup state after a signal
454 * has been taken. Reset signal mask and
455 * stack state from context left by sendsig (above).
456 * Return to previous pc and psl as specified by
457 * context left by sendsig. Check carefully to
458 * make sure that the user has not modified the
459 * state to gain improper privileges.
464 sys_sigreturn(td, uap)
466 struct sigreturn_args /* {
467 const struct __ucontext *sigcntxp;
473 struct trapframe *regs;
476 size_t xfpustate_len;
484 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
486 uprintf("pid %d (%s): sigreturn copyin failed\n",
487 p->p_pid, td->td_name);
491 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
492 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
493 td->td_name, ucp->uc_mcontext.mc_flags);
497 rflags = ucp->uc_mcontext.mc_rflags;
499 * Don't allow users to change privileged or reserved flags.
501 if (!EFL_SECURE(rflags, regs->tf_rflags)) {
502 uprintf("pid %d (%s): sigreturn rflags = 0x%lx\n", p->p_pid,
503 td->td_name, rflags);
508 * Don't allow users to load a valid privileged %cs. Let the
509 * hardware check for invalid selectors, excess privilege in
510 * other selectors, invalid %eip's and invalid %esp's.
512 cs = ucp->uc_mcontext.mc_cs;
513 if (!CS_SECURE(cs)) {
514 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", p->p_pid,
516 ksiginfo_init_trap(&ksi);
517 ksi.ksi_signo = SIGBUS;
518 ksi.ksi_code = BUS_OBJERR;
519 ksi.ksi_trapno = T_PROTFLT;
520 ksi.ksi_addr = (void *)regs->tf_rip;
521 trapsignal(td, &ksi);
525 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
526 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
527 if (xfpustate_len > cpu_max_ext_state_size -
528 sizeof(struct savefpu)) {
529 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
530 p->p_pid, td->td_name, xfpustate_len);
533 xfpustate = __builtin_alloca(xfpustate_len);
534 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate,
535 xfpustate, xfpustate_len);
538 "pid %d (%s): sigreturn copying xfpustate failed\n",
539 p->p_pid, td->td_name);
546 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate, xfpustate_len);
548 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
549 p->p_pid, td->td_name, ret);
552 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
553 pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase;
554 pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase;
556 #if defined(COMPAT_43)
557 if (ucp->uc_mcontext.mc_onstack & 1)
558 td->td_sigstk.ss_flags |= SS_ONSTACK;
560 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
563 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
564 set_pcb_flags(pcb, PCB_FULL_IRET);
565 return (EJUSTRETURN);
568 #ifdef COMPAT_FREEBSD4
570 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
573 return sys_sigreturn(td, (struct sigreturn_args *)uap);
578 * Reset registers to default values on exec.
581 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
583 struct trapframe *regs = td->td_frame;
584 struct pcb *pcb = td->td_pcb;
587 if (td->td_proc->p_md.md_ldt != NULL)
590 mtx_unlock(&dt_lock);
594 clear_pcb_flags(pcb, PCB_32BIT);
595 pcb->pcb_initial_fpucw = __INITIAL_FPUCW__;
596 set_pcb_flags(pcb, PCB_FULL_IRET);
598 bzero((char *)regs, sizeof(struct trapframe));
599 regs->tf_rip = imgp->entry_addr;
600 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
601 regs->tf_rdi = stack; /* argv */
602 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
603 regs->tf_ss = _udatasel;
604 regs->tf_cs = _ucodesel;
605 regs->tf_ds = _udatasel;
606 regs->tf_es = _udatasel;
607 regs->tf_fs = _ufssel;
608 regs->tf_gs = _ugssel;
609 regs->tf_flags = TF_HASSEGS;
610 td->td_retval[1] = 0;
613 * Reset the hardware debug registers if they were in use.
614 * They won't have any meaning for the newly exec'd process.
616 if (pcb->pcb_flags & PCB_DBREGS) {
625 * Clear the debug registers on the running
626 * CPU, otherwise they will end up affecting
627 * the next process we switch to.
631 clear_pcb_flags(pcb, PCB_DBREGS);
635 * Drop the FP state if we hold it, so that the process gets a
636 * clean FP state if it uses the FPU again.
648 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
649 * BSP. See the comments there about why we set them.
651 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
656 * Initialize amd64 and configure to run kernel
660 * Initialize segments & interrupt table
663 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
664 static struct gate_descriptor idt0[NIDT];
665 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
667 static char dblfault_stack[PAGE_SIZE] __aligned(16);
669 static char nmi0_stack[PAGE_SIZE] __aligned(16);
670 CTASSERT(sizeof(struct nmi_pcpu) == 16);
672 struct amd64tss common_tss[MAXCPU];
675 * Software prototypes -- in more palatable form.
677 * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same
678 * slots as corresponding segments for i386 kernel.
680 struct soft_segment_descriptor gdt_segs[] = {
681 /* GNULL_SEL 0 Null Descriptor */
690 /* GNULL2_SEL 1 Null Descriptor */
699 /* GUFS32_SEL 2 32 bit %gs Descriptor for user */
701 .ssd_limit = 0xfffff,
702 .ssd_type = SDT_MEMRWA,
708 /* GUGS32_SEL 3 32 bit %fs Descriptor for user */
710 .ssd_limit = 0xfffff,
711 .ssd_type = SDT_MEMRWA,
717 /* GCODE_SEL 4 Code Descriptor for kernel */
719 .ssd_limit = 0xfffff,
720 .ssd_type = SDT_MEMERA,
726 /* GDATA_SEL 5 Data Descriptor for kernel */
728 .ssd_limit = 0xfffff,
729 .ssd_type = SDT_MEMRWA,
735 /* GUCODE32_SEL 6 32 bit Code Descriptor for user */
737 .ssd_limit = 0xfffff,
738 .ssd_type = SDT_MEMERA,
744 /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */
746 .ssd_limit = 0xfffff,
747 .ssd_type = SDT_MEMRWA,
753 /* GUCODE_SEL 8 64 bit Code Descriptor for user */
755 .ssd_limit = 0xfffff,
756 .ssd_type = SDT_MEMERA,
762 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
764 .ssd_limit = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE - 1,
765 .ssd_type = SDT_SYSTSS,
771 /* Actually, the TSS is a system descriptor which is double size */
780 /* GUSERLDT_SEL 11 LDT Descriptor */
789 /* GUSERLDT_SEL 12 LDT Descriptor, double size */
801 setidt(int idx, inthand_t *func, int typ, int dpl, int ist)
803 struct gate_descriptor *ip;
806 ip->gd_looffset = (uintptr_t)func;
807 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
813 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
817 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
818 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
819 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
820 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
821 IDTVEC(xmm), IDTVEC(dblfault),
826 IDTVEC(xen_intr_upcall),
828 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
832 * Display the index and function name of any IDT entries that don't use
833 * the default 'rsvd' entry point.
835 DB_SHOW_COMMAND(idt, db_show_idt)
837 struct gate_descriptor *ip;
842 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
843 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
844 if (func != (uintptr_t)&IDTVEC(rsvd)) {
845 db_printf("%3d\t", idx);
846 db_printsym(func, DB_STGY_PROC);
853 /* Show privileged registers. */
854 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
859 } __packed idtr, gdtr;
862 __asm __volatile("sidt %0" : "=m" (idtr));
863 db_printf("idtr\t0x%016lx/%04x\n",
864 (u_long)idtr.base, (u_int)idtr.limit);
865 __asm __volatile("sgdt %0" : "=m" (gdtr));
866 db_printf("gdtr\t0x%016lx/%04x\n",
867 (u_long)gdtr.base, (u_int)gdtr.limit);
868 __asm __volatile("sldt %0" : "=r" (ldt));
869 db_printf("ldtr\t0x%04x\n", ldt);
870 __asm __volatile("str %0" : "=r" (tr));
871 db_printf("tr\t0x%04x\n", tr);
872 db_printf("cr0\t0x%016lx\n", rcr0());
873 db_printf("cr2\t0x%016lx\n", rcr2());
874 db_printf("cr3\t0x%016lx\n", rcr3());
875 db_printf("cr4\t0x%016lx\n", rcr4());
876 if (rcr4() & CR4_XSAVE)
877 db_printf("xcr0\t0x%016lx\n", rxcr(0));
878 db_printf("EFER\t0x%016lx\n", rdmsr(MSR_EFER));
879 if (cpu_feature2 & (CPUID2_VMX | CPUID2_SMX))
880 db_printf("FEATURES_CTL\t%016lx\n",
881 rdmsr(MSR_IA32_FEATURE_CONTROL));
882 db_printf("DEBUG_CTL\t0x%016lx\n", rdmsr(MSR_DEBUGCTLMSR));
883 db_printf("PAT\t0x%016lx\n", rdmsr(MSR_PAT));
884 db_printf("GSBASE\t0x%016lx\n", rdmsr(MSR_GSBASE));
887 DB_SHOW_COMMAND(dbregs, db_show_dbregs)
890 db_printf("dr0\t0x%016lx\n", rdr0());
891 db_printf("dr1\t0x%016lx\n", rdr1());
892 db_printf("dr2\t0x%016lx\n", rdr2());
893 db_printf("dr3\t0x%016lx\n", rdr3());
894 db_printf("dr6\t0x%016lx\n", rdr6());
895 db_printf("dr7\t0x%016lx\n", rdr7());
901 struct user_segment_descriptor *sd;
902 struct soft_segment_descriptor *ssd;
905 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
906 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
907 ssd->ssd_type = sd->sd_type;
908 ssd->ssd_dpl = sd->sd_dpl;
909 ssd->ssd_p = sd->sd_p;
910 ssd->ssd_long = sd->sd_long;
911 ssd->ssd_def32 = sd->sd_def32;
912 ssd->ssd_gran = sd->sd_gran;
917 struct soft_segment_descriptor *ssd;
918 struct user_segment_descriptor *sd;
921 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
922 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
923 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
924 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
925 sd->sd_type = ssd->ssd_type;
926 sd->sd_dpl = ssd->ssd_dpl;
927 sd->sd_p = ssd->ssd_p;
928 sd->sd_long = ssd->ssd_long;
929 sd->sd_def32 = ssd->ssd_def32;
930 sd->sd_gran = ssd->ssd_gran;
935 struct soft_segment_descriptor *ssd;
936 struct system_segment_descriptor *sd;
939 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
940 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
941 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
942 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
943 sd->sd_type = ssd->ssd_type;
944 sd->sd_dpl = ssd->ssd_dpl;
945 sd->sd_p = ssd->ssd_p;
946 sd->sd_gran = ssd->ssd_gran;
949 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
950 #include <isa/isavar.h>
951 #include <isa/isareg.h>
953 * Return a bitmap of the current interrupt requests. This is 8259-specific
954 * and is only suitable for use at probe time.
955 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
956 * It shouldn't be here. There should probably be an APIC centric
957 * implementation in the apic driver code, if at all.
960 isa_irq_pending(void)
967 return ((irr2 << 8) | irr1);
974 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
977 int i, insert_idx, physmap_idx;
979 physmap_idx = *physmap_idxp;
985 * Find insertion point while checking for overlap. Start off by
986 * assuming the new entry will be added to the end.
988 * NB: physmap_idx points to the next free slot.
990 insert_idx = physmap_idx;
991 for (i = 0; i <= physmap_idx; i += 2) {
992 if (base < physmap[i + 1]) {
993 if (base + length <= physmap[i]) {
997 if (boothowto & RB_VERBOSE)
999 "Overlapping memory regions, ignoring second region\n");
1004 /* See if we can prepend to the next entry. */
1005 if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) {
1006 physmap[insert_idx] = base;
1010 /* See if we can append to the previous entry. */
1011 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
1012 physmap[insert_idx - 1] += length;
1017 *physmap_idxp = physmap_idx;
1018 if (physmap_idx == PHYSMAP_SIZE) {
1020 "Too many segments in the physical address map, giving up\n");
1025 * Move the last 'N' entries down to make room for the new
1028 for (i = (physmap_idx - 2); i > insert_idx; i -= 2) {
1029 physmap[i] = physmap[i - 2];
1030 physmap[i + 1] = physmap[i - 1];
1033 /* Insert the new entry. */
1034 physmap[insert_idx] = base;
1035 physmap[insert_idx + 1] = base + length;
1040 bios_add_smap_entries(struct bios_smap *smapbase, u_int32_t smapsize,
1041 vm_paddr_t *physmap, int *physmap_idx)
1043 struct bios_smap *smap, *smapend;
1045 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1047 for (smap = smapbase; smap < smapend; smap++) {
1048 if (boothowto & RB_VERBOSE)
1049 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1050 smap->type, smap->base, smap->length);
1052 if (smap->type != SMAP_TYPE_MEMORY)
1055 if (!add_physmap_entry(smap->base, smap->length, physmap,
1061 #define efi_next_descriptor(ptr, size) \
1062 ((struct efi_md *)(((uint8_t *) ptr) + size))
1065 add_efi_map_entries(struct efi_map_header *efihdr, vm_paddr_t *physmap,
1068 struct efi_md *map, *p;
1073 static const char *types[] = {
1079 "RuntimeServicesCode",
1080 "RuntimeServicesData",
1081 "ConventionalMemory",
1083 "ACPIReclaimMemory",
1086 "MemoryMappedIOPortSpace",
1091 * Memory map data provided by UEFI via the GetMemoryMap
1092 * Boot Services API.
1094 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
1095 map = (struct efi_md *)((uint8_t *)efihdr + efisz);
1097 if (efihdr->descriptor_size == 0)
1099 ndesc = efihdr->memory_size / efihdr->descriptor_size;
1101 if (boothowto & RB_VERBOSE)
1102 printf("%23s %12s %12s %8s %4s\n",
1103 "Type", "Physical", "Virtual", "#Pages", "Attr");
1105 for (i = 0, p = map; i < ndesc; i++,
1106 p = efi_next_descriptor(p, efihdr->descriptor_size)) {
1107 if (boothowto & RB_VERBOSE) {
1108 if (p->md_type <= EFI_MD_TYPE_PALCODE)
1109 type = types[p->md_type];
1112 printf("%23s %012lx %12p %08lx ", type, p->md_phys,
1113 p->md_virt, p->md_pages);
1114 if (p->md_attr & EFI_MD_ATTR_UC)
1116 if (p->md_attr & EFI_MD_ATTR_WC)
1118 if (p->md_attr & EFI_MD_ATTR_WT)
1120 if (p->md_attr & EFI_MD_ATTR_WB)
1122 if (p->md_attr & EFI_MD_ATTR_UCE)
1124 if (p->md_attr & EFI_MD_ATTR_WP)
1126 if (p->md_attr & EFI_MD_ATTR_RP)
1128 if (p->md_attr & EFI_MD_ATTR_XP)
1130 if (p->md_attr & EFI_MD_ATTR_RT)
1135 switch (p->md_type) {
1136 case EFI_MD_TYPE_CODE:
1137 case EFI_MD_TYPE_DATA:
1138 case EFI_MD_TYPE_BS_CODE:
1139 case EFI_MD_TYPE_BS_DATA:
1140 case EFI_MD_TYPE_FREE:
1142 * We're allowed to use any entry with these types.
1149 if (!add_physmap_entry(p->md_phys, (p->md_pages * PAGE_SIZE),
1150 physmap, physmap_idx))
1155 static char bootmethod[16] = "";
1156 SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0,
1157 "System firmware boot method");
1160 native_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
1162 struct bios_smap *smap;
1163 struct efi_map_header *efihdr;
1167 * Memory map from INT 15:E820.
1169 * subr_module.c says:
1170 * "Consumer may safely assume that size value precedes data."
1171 * ie: an int32_t immediately precedes smap.
1174 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1175 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1176 smap = (struct bios_smap *)preload_search_info(kmdp,
1177 MODINFO_METADATA | MODINFOMD_SMAP);
1178 if (efihdr == NULL && smap == NULL)
1179 panic("No BIOS smap or EFI map info from loader!");
1181 if (efihdr != NULL) {
1182 add_efi_map_entries(efihdr, physmap, physmap_idx);
1183 strlcpy(bootmethod, "UEFI", sizeof(bootmethod));
1185 size = *((u_int32_t *)smap - 1);
1186 bios_add_smap_entries(smap, size, physmap, physmap_idx);
1187 strlcpy(bootmethod, "BIOS", sizeof(bootmethod));
1191 #define PAGES_PER_GB (1024 * 1024 * 1024 / PAGE_SIZE)
1194 * Populate the (physmap) array with base/bound pairs describing the
1195 * available physical memory in the system, then test this memory and
1196 * build the phys_avail array describing the actually-available memory.
1198 * Total memory size may be set by the kernel environment variable
1199 * hw.physmem or the compile-time define MAXMEM.
1201 * XXX first should be vm_paddr_t.
1204 getmemsize(caddr_t kmdp, u_int64_t first)
1206 int i, physmap_idx, pa_indx, da_indx;
1207 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1208 u_long physmem_start, physmem_tunable, memtest;
1210 quad_t dcons_addr, dcons_size;
1213 bzero(physmap, sizeof(physmap));
1216 init_ops.parse_memmap(kmdp, physmap, &physmap_idx);
1220 * Find the 'base memory' segment for SMP
1223 for (i = 0; i <= physmap_idx; i += 2) {
1224 if (physmap[i] <= 0xA0000) {
1225 basemem = physmap[i + 1] / 1024;
1229 if (basemem == 0 || basemem > 640) {
1232 "Memory map doesn't contain a basemem segment, faking it");
1237 * Make hole for "AP -> long mode" bootstrap code. The
1238 * mp_bootaddress vector is only available when the kernel
1239 * is configured to support APs and APs for the system start
1240 * in 32bit mode (e.g. SMP bare metal).
1242 if (init_ops.mp_bootaddress) {
1243 if (physmap[1] >= 0x100000000)
1245 "Basemem segment is not suitable for AP bootstrap code!");
1246 physmap[1] = init_ops.mp_bootaddress(physmap[1] / 1024);
1250 * Maxmem isn't the "maximum memory", it's one larger than the
1251 * highest page of the physical address space. It should be
1252 * called something like "Maxphyspage". We may adjust this
1253 * based on ``hw.physmem'' and the results of the memory test.
1255 Maxmem = atop(physmap[physmap_idx + 1]);
1258 Maxmem = MAXMEM / 4;
1261 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1262 Maxmem = atop(physmem_tunable);
1265 * The boot memory test is disabled by default, as it takes a
1266 * significant amount of time on large-memory systems, and is
1267 * unfriendly to virtual machines as it unnecessarily touches all
1270 * A general name is used as the code may be extended to support
1271 * additional tests beyond the current "page present" test.
1274 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
1277 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1280 if (Maxmem > atop(physmap[physmap_idx + 1]))
1281 Maxmem = atop(physmap[physmap_idx + 1]);
1283 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1284 (boothowto & RB_VERBOSE))
1285 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1287 /* call pmap initialization to make new kernel address space */
1288 pmap_bootstrap(&first);
1291 * Size up each available chunk of physical memory.
1293 * XXX Some BIOSes corrupt low 64KB between suspend and resume.
1294 * By default, mask off the first 16 pages unless we appear to be
1297 physmem_start = (vm_guest > VM_GUEST_NO ? 1 : 16) << PAGE_SHIFT;
1298 TUNABLE_ULONG_FETCH("hw.physmem.start", &physmem_start);
1299 if (physmap[0] < physmem_start) {
1300 if (physmem_start < PAGE_SIZE)
1301 physmap[0] = PAGE_SIZE;
1302 else if (physmem_start >= physmap[1])
1303 physmap[0] = round_page(physmap[1] - PAGE_SIZE);
1305 physmap[0] = round_page(physmem_start);
1309 phys_avail[pa_indx++] = physmap[0];
1310 phys_avail[pa_indx] = physmap[0];
1311 dump_avail[da_indx] = physmap[0];
1315 * Get dcons buffer address
1317 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1318 getenv_quad("dcons.size", &dcons_size) == 0)
1322 * physmap is in bytes, so when converting to page boundaries,
1323 * round up the start address and round down the end address.
1327 printf("Testing system memory");
1328 for (i = 0; i <= physmap_idx; i += 2) {
1331 end = ptoa((vm_paddr_t)Maxmem);
1332 if (physmap[i + 1] < end)
1333 end = trunc_page(physmap[i + 1]);
1334 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1335 int tmp, page_bad, full;
1336 int *ptr = (int *)CADDR1;
1340 * block out kernel memory as not available.
1342 if (pa >= (vm_paddr_t)kernphys && pa < first)
1346 * block out dcons buffer
1349 && pa >= trunc_page(dcons_addr)
1350 && pa < dcons_addr + dcons_size)
1358 * Print a "." every GB to show we're making
1362 if ((page_counter % PAGES_PER_GB) == 0)
1366 * map page into kernel: valid, read/write,non-cacheable
1368 *pte = pa | PG_V | PG_RW | PG_NC_PWT | PG_NC_PCD;
1373 * Test for alternating 1's and 0's
1375 *(volatile int *)ptr = 0xaaaaaaaa;
1376 if (*(volatile int *)ptr != 0xaaaaaaaa)
1379 * Test for alternating 0's and 1's
1381 *(volatile int *)ptr = 0x55555555;
1382 if (*(volatile int *)ptr != 0x55555555)
1387 *(volatile int *)ptr = 0xffffffff;
1388 if (*(volatile int *)ptr != 0xffffffff)
1393 *(volatile int *)ptr = 0x0;
1394 if (*(volatile int *)ptr != 0x0)
1397 * Restore original value.
1403 * Adjust array of valid/good pages.
1405 if (page_bad == TRUE)
1408 * If this good page is a continuation of the
1409 * previous set of good pages, then just increase
1410 * the end pointer. Otherwise start a new chunk.
1411 * Note that "end" points one higher than end,
1412 * making the range >= start and < end.
1413 * If we're also doing a speculative memory
1414 * test and we at or past the end, bump up Maxmem
1415 * so that we keep going. The first bad page
1416 * will terminate the loop.
1418 if (phys_avail[pa_indx] == pa) {
1419 phys_avail[pa_indx] += PAGE_SIZE;
1422 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1424 "Too many holes in the physical address space, giving up\n");
1429 phys_avail[pa_indx++] = pa; /* start */
1430 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1434 if (dump_avail[da_indx] == pa) {
1435 dump_avail[da_indx] += PAGE_SIZE;
1438 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1442 dump_avail[da_indx++] = pa; /* start */
1443 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1457 * The last chunk must contain at least one page plus the message
1458 * buffer to avoid complicating other code (message buffer address
1459 * calculation, etc.).
1461 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1462 round_page(msgbufsize) >= phys_avail[pa_indx]) {
1463 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1464 phys_avail[pa_indx--] = 0;
1465 phys_avail[pa_indx--] = 0;
1468 Maxmem = atop(phys_avail[pa_indx]);
1470 /* Trim off space for the message buffer. */
1471 phys_avail[pa_indx] -= round_page(msgbufsize);
1473 /* Map the message buffer. */
1474 msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
1478 native_parse_preload_data(u_int64_t modulep)
1482 vm_offset_t ksym_start;
1483 vm_offset_t ksym_end;
1486 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1487 preload_bootstrap_relocate(KERNBASE);
1488 kmdp = preload_search_by_type("elf kernel");
1490 kmdp = preload_search_by_type("elf64 kernel");
1491 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1492 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1494 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1495 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1496 db_fetch_ksymtab(ksym_start, ksym_end);
1503 hammer_time(u_int64_t modulep, u_int64_t physfree)
1508 struct nmi_pcpu *np;
1509 struct xstate_hdr *xhdr;
1515 * This may be done better later if it gets more high level
1516 * components in it. If so just link td->td_proc here.
1518 proc_linkup0(&proc0, &thread0);
1520 kmdp = init_ops.parse_preload_data(modulep);
1522 /* Init basic tunables, hz etc */
1525 thread0.td_kstack = physfree + KERNBASE;
1526 thread0.td_kstack_pages = kstack_pages;
1527 kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
1528 bzero((void *)thread0.td_kstack, kstack0_sz);
1529 physfree += kstack0_sz;
1532 * make gdt memory segments
1534 for (x = 0; x < NGDT; x++) {
1535 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1536 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1537 ssdtosd(&gdt_segs[x], &gdt[x]);
1539 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1540 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1541 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1543 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1544 r_gdt.rd_base = (long) gdt;
1548 wrmsr(MSR_FSBASE, 0); /* User value */
1549 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1550 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1552 pcpu_init(pc, 0, sizeof(struct pcpu));
1553 dpcpu_init((void *)(physfree + KERNBASE), 0);
1554 physfree += DPCPU_SIZE;
1555 PCPU_SET(prvspace, pc);
1556 PCPU_SET(curthread, &thread0);
1557 PCPU_SET(tssp, &common_tss[0]);
1558 PCPU_SET(commontssp, &common_tss[0]);
1559 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1560 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1561 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1562 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1565 * Initialize mutexes.
1567 * icu_lock: in order to allow an interrupt to occur in a critical
1568 * section, to set pcpu->ipending (etc...) properly, we
1569 * must be able to get the icu lock, so it can't be
1573 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1574 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1577 for (x = 0; x < NIDT; x++)
1578 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1579 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1580 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1581 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1582 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1583 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1584 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1585 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1586 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1587 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1588 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1589 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1590 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1591 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1592 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1593 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1594 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1595 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1596 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1597 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1598 #ifdef KDTRACE_HOOKS
1599 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
1602 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall), SDT_SYSIGT, SEL_UPL, 0);
1605 r_idt.rd_limit = sizeof(idt0) - 1;
1606 r_idt.rd_base = (long) idt;
1610 * Initialize the clock before the console so that console
1611 * initialization can use DELAY().
1616 * Use vt(4) by default for UEFI boot (during the sc(4)/vt(4)
1619 if (preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP)
1621 vty_set_preferred(VTY_VT);
1623 identify_cpu(); /* Final stage of CPU initialization */
1624 initializecpu(); /* Initialize CPU registers */
1625 initializecpucache();
1627 /* doublefault stack space, runs on ist1 */
1628 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1631 * NMI stack, runs on ist2. The pcpu pointer is stored just
1632 * above the start of the ist2 stack.
1634 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1635 np->np_pcpu = (register_t) pc;
1636 common_tss[0].tss_ist2 = (long) np;
1638 /* Set the IO permission bitmap (empty due to tss seg limit) */
1639 common_tss[0].tss_iobase = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE;
1641 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1644 /* Set up the fast syscall stuff */
1645 msr = rdmsr(MSR_EFER) | EFER_SCE;
1646 wrmsr(MSR_EFER, msr);
1647 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1648 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1649 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1650 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1651 wrmsr(MSR_STAR, msr);
1652 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1654 getmemsize(kmdp, physfree);
1655 init_param2(physmem);
1657 /* now running on new page tables, configured,and u/iom is accessible */
1666 /* Reset and mask the atpics and leave them shut down. */
1670 * Point the ICU spurious interrupt vectors at the APIC spurious
1671 * interrupt handler.
1673 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1674 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1677 #error "have you forgotten the isa device?";
1683 if (boothowto & RB_KDB)
1684 kdb_enter(KDB_WHY_BOOTFLAGS,
1685 "Boot flags requested debugger");
1688 msgbufinit(msgbufp, msgbufsize);
1692 * Set up thread0 pcb after fpuinit calculated pcb + fpu save
1693 * area size. Zero out the extended state header in fpu save
1696 thread0.td_pcb = get_pcb_td(&thread0);
1697 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
1699 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
1701 xhdr->xstate_bv = xsave_mask;
1703 /* make an initial tss so cpu can get interrupt stack on syscall! */
1704 common_tss[0].tss_rsp0 = (vm_offset_t)thread0.td_pcb;
1705 /* Ensure the stack is aligned to 16 bytes */
1706 common_tss[0].tss_rsp0 &= ~0xFul;
1707 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1708 PCPU_SET(curpcb, thread0.td_pcb);
1710 /* transfer to user mode */
1712 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1713 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1714 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1715 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
1716 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
1722 /* setup proc 0's pcb */
1723 thread0.td_pcb->pcb_flags = 0;
1724 thread0.td_frame = &proc0_tf;
1726 env = kern_getenv("kernelname");
1728 strlcpy(kernelname, env, sizeof(kernelname));
1736 /* Location of kernel stack for locore */
1737 return ((u_int64_t)thread0.td_pcb);
1741 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1744 pcpu->pc_acpi_id = 0xffffffff;
1748 smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
1750 struct bios_smap *smapbase;
1751 struct bios_smap_xattr smap;
1754 int count, error, i;
1756 /* Retrieve the system memory map from the loader. */
1757 kmdp = preload_search_by_type("elf kernel");
1759 kmdp = preload_search_by_type("elf64 kernel");
1760 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1761 MODINFO_METADATA | MODINFOMD_SMAP);
1762 if (smapbase == NULL)
1764 smapattr = (uint32_t *)preload_search_info(kmdp,
1765 MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
1766 count = *((uint32_t *)smapbase - 1) / sizeof(*smapbase);
1768 for (i = 0; i < count; i++) {
1769 smap.base = smapbase[i].base;
1770 smap.length = smapbase[i].length;
1771 smap.type = smapbase[i].type;
1772 if (smapattr != NULL)
1773 smap.xattr = smapattr[i];
1776 error = SYSCTL_OUT(req, &smap, sizeof(smap));
1780 SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
1781 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
1784 efi_map_sysctl_handler(SYSCTL_HANDLER_ARGS)
1786 struct efi_map_header *efihdr;
1790 kmdp = preload_search_by_type("elf kernel");
1792 kmdp = preload_search_by_type("elf64 kernel");
1793 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1794 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1797 efisize = *((uint32_t *)efihdr - 1);
1798 return (SYSCTL_OUT(req, efihdr, efisize));
1800 SYSCTL_PROC(_machdep, OID_AUTO, efi_map, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
1801 efi_map_sysctl_handler, "S,efi_map_header", "Raw EFI Memory Map");
1804 spinlock_enter(void)
1810 if (td->td_md.md_spinlock_count == 0) {
1811 flags = intr_disable();
1812 td->td_md.md_spinlock_count = 1;
1813 td->td_md.md_saved_flags = flags;
1815 td->td_md.md_spinlock_count++;
1827 flags = td->td_md.md_saved_flags;
1828 td->td_md.md_spinlock_count--;
1829 if (td->td_md.md_spinlock_count == 0)
1830 intr_restore(flags);
1834 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1835 * we want to start a backtrace from the function that caused us to enter
1836 * the debugger. We have the context in the trapframe, but base the trace
1837 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1838 * enough for a backtrace.
1841 makectx(struct trapframe *tf, struct pcb *pcb)
1844 pcb->pcb_r12 = tf->tf_r12;
1845 pcb->pcb_r13 = tf->tf_r13;
1846 pcb->pcb_r14 = tf->tf_r14;
1847 pcb->pcb_r15 = tf->tf_r15;
1848 pcb->pcb_rbp = tf->tf_rbp;
1849 pcb->pcb_rbx = tf->tf_rbx;
1850 pcb->pcb_rip = tf->tf_rip;
1851 pcb->pcb_rsp = tf->tf_rsp;
1855 ptrace_set_pc(struct thread *td, unsigned long addr)
1858 td->td_frame->tf_rip = addr;
1859 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
1864 ptrace_single_step(struct thread *td)
1866 td->td_frame->tf_rflags |= PSL_T;
1871 ptrace_clear_single_step(struct thread *td)
1873 td->td_frame->tf_rflags &= ~PSL_T;
1878 fill_regs(struct thread *td, struct reg *regs)
1880 struct trapframe *tp;
1883 return (fill_frame_regs(tp, regs));
1887 fill_frame_regs(struct trapframe *tp, struct reg *regs)
1889 regs->r_r15 = tp->tf_r15;
1890 regs->r_r14 = tp->tf_r14;
1891 regs->r_r13 = tp->tf_r13;
1892 regs->r_r12 = tp->tf_r12;
1893 regs->r_r11 = tp->tf_r11;
1894 regs->r_r10 = tp->tf_r10;
1895 regs->r_r9 = tp->tf_r9;
1896 regs->r_r8 = tp->tf_r8;
1897 regs->r_rdi = tp->tf_rdi;
1898 regs->r_rsi = tp->tf_rsi;
1899 regs->r_rbp = tp->tf_rbp;
1900 regs->r_rbx = tp->tf_rbx;
1901 regs->r_rdx = tp->tf_rdx;
1902 regs->r_rcx = tp->tf_rcx;
1903 regs->r_rax = tp->tf_rax;
1904 regs->r_rip = tp->tf_rip;
1905 regs->r_cs = tp->tf_cs;
1906 regs->r_rflags = tp->tf_rflags;
1907 regs->r_rsp = tp->tf_rsp;
1908 regs->r_ss = tp->tf_ss;
1909 if (tp->tf_flags & TF_HASSEGS) {
1910 regs->r_ds = tp->tf_ds;
1911 regs->r_es = tp->tf_es;
1912 regs->r_fs = tp->tf_fs;
1913 regs->r_gs = tp->tf_gs;
1924 set_regs(struct thread *td, struct reg *regs)
1926 struct trapframe *tp;
1930 rflags = regs->r_rflags & 0xffffffff;
1931 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
1933 tp->tf_r15 = regs->r_r15;
1934 tp->tf_r14 = regs->r_r14;
1935 tp->tf_r13 = regs->r_r13;
1936 tp->tf_r12 = regs->r_r12;
1937 tp->tf_r11 = regs->r_r11;
1938 tp->tf_r10 = regs->r_r10;
1939 tp->tf_r9 = regs->r_r9;
1940 tp->tf_r8 = regs->r_r8;
1941 tp->tf_rdi = regs->r_rdi;
1942 tp->tf_rsi = regs->r_rsi;
1943 tp->tf_rbp = regs->r_rbp;
1944 tp->tf_rbx = regs->r_rbx;
1945 tp->tf_rdx = regs->r_rdx;
1946 tp->tf_rcx = regs->r_rcx;
1947 tp->tf_rax = regs->r_rax;
1948 tp->tf_rip = regs->r_rip;
1949 tp->tf_cs = regs->r_cs;
1950 tp->tf_rflags = rflags;
1951 tp->tf_rsp = regs->r_rsp;
1952 tp->tf_ss = regs->r_ss;
1953 if (0) { /* XXXKIB */
1954 tp->tf_ds = regs->r_ds;
1955 tp->tf_es = regs->r_es;
1956 tp->tf_fs = regs->r_fs;
1957 tp->tf_gs = regs->r_gs;
1958 tp->tf_flags = TF_HASSEGS;
1960 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
1964 /* XXX check all this stuff! */
1965 /* externalize from sv_xmm */
1967 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
1969 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1970 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1974 bzero(fpregs, sizeof(*fpregs));
1976 /* FPU control/status */
1977 penv_fpreg->en_cw = penv_xmm->en_cw;
1978 penv_fpreg->en_sw = penv_xmm->en_sw;
1979 penv_fpreg->en_tw = penv_xmm->en_tw;
1980 penv_fpreg->en_opcode = penv_xmm->en_opcode;
1981 penv_fpreg->en_rip = penv_xmm->en_rip;
1982 penv_fpreg->en_rdp = penv_xmm->en_rdp;
1983 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
1984 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
1987 for (i = 0; i < 8; ++i)
1988 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
1991 for (i = 0; i < 16; ++i)
1992 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
1995 /* internalize from fpregs into sv_xmm */
1997 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
1999 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2000 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2004 /* FPU control/status */
2005 penv_xmm->en_cw = penv_fpreg->en_cw;
2006 penv_xmm->en_sw = penv_fpreg->en_sw;
2007 penv_xmm->en_tw = penv_fpreg->en_tw;
2008 penv_xmm->en_opcode = penv_fpreg->en_opcode;
2009 penv_xmm->en_rip = penv_fpreg->en_rip;
2010 penv_xmm->en_rdp = penv_fpreg->en_rdp;
2011 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
2012 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
2015 for (i = 0; i < 8; ++i)
2016 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
2019 for (i = 0; i < 16; ++i)
2020 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
2023 /* externalize from td->pcb */
2025 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2028 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2029 P_SHOULDSTOP(td->td_proc),
2030 ("not suspended thread %p", td));
2032 fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs);
2036 /* internalize to td->pcb */
2038 set_fpregs(struct thread *td, struct fpreg *fpregs)
2041 set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
2047 * Get machine context.
2050 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2053 struct trapframe *tp;
2057 PROC_LOCK(curthread->td_proc);
2058 mcp->mc_onstack = sigonstack(tp->tf_rsp);
2059 PROC_UNLOCK(curthread->td_proc);
2060 mcp->mc_r15 = tp->tf_r15;
2061 mcp->mc_r14 = tp->tf_r14;
2062 mcp->mc_r13 = tp->tf_r13;
2063 mcp->mc_r12 = tp->tf_r12;
2064 mcp->mc_r11 = tp->tf_r11;
2065 mcp->mc_r10 = tp->tf_r10;
2066 mcp->mc_r9 = tp->tf_r9;
2067 mcp->mc_r8 = tp->tf_r8;
2068 mcp->mc_rdi = tp->tf_rdi;
2069 mcp->mc_rsi = tp->tf_rsi;
2070 mcp->mc_rbp = tp->tf_rbp;
2071 mcp->mc_rbx = tp->tf_rbx;
2072 mcp->mc_rcx = tp->tf_rcx;
2073 mcp->mc_rflags = tp->tf_rflags;
2074 if (flags & GET_MC_CLEAR_RET) {
2077 mcp->mc_rflags &= ~PSL_C;
2079 mcp->mc_rax = tp->tf_rax;
2080 mcp->mc_rdx = tp->tf_rdx;
2082 mcp->mc_rip = tp->tf_rip;
2083 mcp->mc_cs = tp->tf_cs;
2084 mcp->mc_rsp = tp->tf_rsp;
2085 mcp->mc_ss = tp->tf_ss;
2086 mcp->mc_ds = tp->tf_ds;
2087 mcp->mc_es = tp->tf_es;
2088 mcp->mc_fs = tp->tf_fs;
2089 mcp->mc_gs = tp->tf_gs;
2090 mcp->mc_flags = tp->tf_flags;
2091 mcp->mc_len = sizeof(*mcp);
2092 get_fpcontext(td, mcp, NULL, 0);
2093 mcp->mc_fsbase = pcb->pcb_fsbase;
2094 mcp->mc_gsbase = pcb->pcb_gsbase;
2095 mcp->mc_xfpustate = 0;
2096 mcp->mc_xfpustate_len = 0;
2097 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
2102 * Set machine context.
2104 * However, we don't set any but the user modifiable flags, and we won't
2105 * touch the cs selector.
2108 set_mcontext(struct thread *td, mcontext_t *mcp)
2111 struct trapframe *tp;
2118 if (mcp->mc_len != sizeof(*mcp) ||
2119 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2121 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2122 (tp->tf_rflags & ~PSL_USERCHANGE);
2123 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2124 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2125 sizeof(struct savefpu))
2127 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2128 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2129 mcp->mc_xfpustate_len);
2134 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2137 tp->tf_r15 = mcp->mc_r15;
2138 tp->tf_r14 = mcp->mc_r14;
2139 tp->tf_r13 = mcp->mc_r13;
2140 tp->tf_r12 = mcp->mc_r12;
2141 tp->tf_r11 = mcp->mc_r11;
2142 tp->tf_r10 = mcp->mc_r10;
2143 tp->tf_r9 = mcp->mc_r9;
2144 tp->tf_r8 = mcp->mc_r8;
2145 tp->tf_rdi = mcp->mc_rdi;
2146 tp->tf_rsi = mcp->mc_rsi;
2147 tp->tf_rbp = mcp->mc_rbp;
2148 tp->tf_rbx = mcp->mc_rbx;
2149 tp->tf_rdx = mcp->mc_rdx;
2150 tp->tf_rcx = mcp->mc_rcx;
2151 tp->tf_rax = mcp->mc_rax;
2152 tp->tf_rip = mcp->mc_rip;
2153 tp->tf_rflags = rflags;
2154 tp->tf_rsp = mcp->mc_rsp;
2155 tp->tf_ss = mcp->mc_ss;
2156 tp->tf_flags = mcp->mc_flags;
2157 if (tp->tf_flags & TF_HASSEGS) {
2158 tp->tf_ds = mcp->mc_ds;
2159 tp->tf_es = mcp->mc_es;
2160 tp->tf_fs = mcp->mc_fs;
2161 tp->tf_gs = mcp->mc_gs;
2163 if (mcp->mc_flags & _MC_HASBASES) {
2164 pcb->pcb_fsbase = mcp->mc_fsbase;
2165 pcb->pcb_gsbase = mcp->mc_gsbase;
2167 set_pcb_flags(pcb, PCB_FULL_IRET);
2172 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2173 size_t xfpusave_len)
2175 size_t max_len, len;
2177 mcp->mc_ownedfp = fpugetregs(td);
2178 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
2179 sizeof(mcp->mc_fpstate));
2180 mcp->mc_fpformat = fpuformat();
2181 if (!use_xsave || xfpusave_len == 0)
2183 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
2185 if (len > max_len) {
2187 bzero(xfpusave + max_len, len - max_len);
2189 mcp->mc_flags |= _MC_HASFPXSTATE;
2190 mcp->mc_xfpustate_len = len;
2191 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
2195 set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate,
2196 size_t xfpustate_len)
2198 struct savefpu *fpstate;
2201 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2203 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2205 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
2206 /* We don't care what state is left in the FPU or PCB. */
2209 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2210 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2211 fpstate = (struct savefpu *)&mcp->mc_fpstate;
2212 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
2213 error = fpusetregs(td, fpstate, xfpustate, xfpustate_len);
2220 fpstate_drop(struct thread *td)
2223 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
2225 if (PCPU_GET(fpcurthread) == td)
2228 * XXX force a full drop of the fpu. The above only drops it if we
2231 * XXX I don't much like fpugetuserregs()'s semantics of doing a full
2232 * drop. Dropping only to the pcb matches fnsave's behaviour.
2233 * We only need to drop to !PCB_INITDONE in sendsig(). But
2234 * sendsig() is the only caller of fpugetuserregs()... perhaps we just
2235 * have too many layers.
2237 clear_pcb_flags(curthread->td_pcb,
2238 PCB_FPUINITDONE | PCB_USERFPUINITDONE);
2243 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2248 dbregs->dr[0] = rdr0();
2249 dbregs->dr[1] = rdr1();
2250 dbregs->dr[2] = rdr2();
2251 dbregs->dr[3] = rdr3();
2252 dbregs->dr[6] = rdr6();
2253 dbregs->dr[7] = rdr7();
2256 dbregs->dr[0] = pcb->pcb_dr0;
2257 dbregs->dr[1] = pcb->pcb_dr1;
2258 dbregs->dr[2] = pcb->pcb_dr2;
2259 dbregs->dr[3] = pcb->pcb_dr3;
2260 dbregs->dr[6] = pcb->pcb_dr6;
2261 dbregs->dr[7] = pcb->pcb_dr7;
2277 set_dbregs(struct thread *td, struct dbreg *dbregs)
2283 load_dr0(dbregs->dr[0]);
2284 load_dr1(dbregs->dr[1]);
2285 load_dr2(dbregs->dr[2]);
2286 load_dr3(dbregs->dr[3]);
2287 load_dr6(dbregs->dr[6]);
2288 load_dr7(dbregs->dr[7]);
2291 * Don't let an illegal value for dr7 get set. Specifically,
2292 * check for undefined settings. Setting these bit patterns
2293 * result in undefined behaviour and can lead to an unexpected
2294 * TRCTRAP or a general protection fault right here.
2295 * Upper bits of dr6 and dr7 must not be set
2297 for (i = 0; i < 4; i++) {
2298 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2300 if (td->td_frame->tf_cs == _ucode32sel &&
2301 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2304 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2305 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2311 * Don't let a process set a breakpoint that is not within the
2312 * process's address space. If a process could do this, it
2313 * could halt the system by setting a breakpoint in the kernel
2314 * (if ddb was enabled). Thus, we need to check to make sure
2315 * that no breakpoints are being enabled for addresses outside
2316 * process's address space.
2318 * XXX - what about when the watched area of the user's
2319 * address space is written into from within the kernel
2320 * ... wouldn't that still cause a breakpoint to be generated
2321 * from within kernel mode?
2324 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2325 /* dr0 is enabled */
2326 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2329 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2330 /* dr1 is enabled */
2331 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2334 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2335 /* dr2 is enabled */
2336 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2339 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2340 /* dr3 is enabled */
2341 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2345 pcb->pcb_dr0 = dbregs->dr[0];
2346 pcb->pcb_dr1 = dbregs->dr[1];
2347 pcb->pcb_dr2 = dbregs->dr[2];
2348 pcb->pcb_dr3 = dbregs->dr[3];
2349 pcb->pcb_dr6 = dbregs->dr[6];
2350 pcb->pcb_dr7 = dbregs->dr[7];
2352 set_pcb_flags(pcb, PCB_DBREGS);
2362 load_dr7(0); /* Turn off the control bits first */
2371 * Return > 0 if a hardware breakpoint has been hit, and the
2372 * breakpoint was in user space. Return 0, otherwise.
2375 user_dbreg_trap(void)
2377 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2378 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2379 int nbp; /* number of breakpoints that triggered */
2380 caddr_t addr[4]; /* breakpoint addresses */
2384 if ((dr7 & 0x000000ff) == 0) {
2386 * all GE and LE bits in the dr7 register are zero,
2387 * thus the trap couldn't have been caused by the
2388 * hardware debug registers
2395 bp = dr6 & 0x0000000f;
2399 * None of the breakpoint bits are set meaning this
2400 * trap was not caused by any of the debug registers
2406 * at least one of the breakpoints were hit, check to see
2407 * which ones and if any of them are user space addresses
2411 addr[nbp++] = (caddr_t)rdr0();
2414 addr[nbp++] = (caddr_t)rdr1();
2417 addr[nbp++] = (caddr_t)rdr2();
2420 addr[nbp++] = (caddr_t)rdr3();
2423 for (i = 0; i < nbp; i++) {
2424 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2426 * addr[i] is in user space
2433 * None of the breakpoints are in user space.
2441 * Provide inb() and outb() as functions. They are normally only available as
2442 * inline functions, thus cannot be called from the debugger.
2445 /* silence compiler warnings */
2446 u_char inb_(u_short);
2447 void outb_(u_short, u_char);
2456 outb_(u_short port, u_char data)