2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 2003 Peter Wemm.
5 * Copyright (c) 1992 Terrence R. Lambert.
6 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
9 * This code is derived from software contributed to Berkeley by
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include "opt_atpic.h"
47 #include "opt_compat.h"
52 #include "opt_kstack_pages.h"
53 #include "opt_maxmem.h"
54 #include "opt_mp_watchdog.h"
55 #include "opt_platform.h"
56 #include "opt_sched.h"
58 #include <sys/param.h>
60 #include <sys/systm.h>
64 #include <sys/callout.h>
68 #include <sys/eventhandler.h>
70 #include <sys/imgact.h>
72 #include <sys/kernel.h>
74 #include <sys/linker.h>
76 #include <sys/malloc.h>
77 #include <sys/memrange.h>
78 #include <sys/msgbuf.h>
79 #include <sys/mutex.h>
81 #include <sys/ptrace.h>
82 #include <sys/reboot.h>
83 #include <sys/rwlock.h>
84 #include <sys/sched.h>
85 #include <sys/signalvar.h>
89 #include <sys/syscallsubr.h>
90 #include <sys/sysctl.h>
91 #include <sys/sysent.h>
92 #include <sys/sysproto.h>
93 #include <sys/ucontext.h>
94 #include <sys/vmmeter.h>
97 #include <vm/vm_extern.h>
98 #include <vm/vm_kern.h>
99 #include <vm/vm_page.h>
100 #include <vm/vm_map.h>
101 #include <vm/vm_object.h>
102 #include <vm/vm_pager.h>
103 #include <vm/vm_param.h>
107 #error KDB must be enabled in order for DDB to work!
110 #include <ddb/db_sym.h>
113 #include <net/netisr.h>
115 #include <machine/clock.h>
116 #include <machine/cpu.h>
117 #include <machine/cputypes.h>
118 #include <machine/intr_machdep.h>
120 #include <machine/md_var.h>
121 #include <machine/metadata.h>
122 #include <machine/mp_watchdog.h>
123 #include <machine/pc/bios.h>
124 #include <machine/pcb.h>
125 #include <machine/proc.h>
126 #include <machine/reg.h>
127 #include <machine/sigframe.h>
128 #include <machine/specialreg.h>
129 #include <machine/tss.h>
131 #include <machine/smp.h>
138 #include <x86/isa/icu.h>
140 #include <x86/apicvar.h>
143 #include <isa/isareg.h>
145 #include <x86/init.h>
147 /* Sanity check for __curthread() */
148 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
150 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
152 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
153 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
155 static void cpu_startup(void *);
156 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
157 char *xfpusave, size_t xfpusave_len);
158 static int set_fpcontext(struct thread *td, mcontext_t *mcp,
159 char *xfpustate, size_t xfpustate_len);
160 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
162 /* Preload data parse function */
163 static caddr_t native_parse_preload_data(u_int64_t);
165 /* Native function to fetch and parse the e820 map */
166 static void native_parse_memmap(caddr_t, vm_paddr_t *, int *);
168 /* Default init_ops implementation. */
169 struct init_ops init_ops = {
170 .parse_preload_data = native_parse_preload_data,
171 .early_clock_source_init = i8254_init,
172 .early_delay = i8254_delay,
173 .parse_memmap = native_parse_memmap,
175 .mp_bootaddress = mp_bootaddress,
176 .start_all_aps = native_start_all_aps,
178 .msi_init = msi_init,
182 * The file "conf/ldscript.amd64" defines the symbol "kernphys". Its value is
183 * the physical address at which the kernel is loaded.
185 extern char kernphys[];
187 struct msgbuf *msgbufp;
190 * Physical address of the EFI System Table. Stashed from the metadata hints
191 * passed into the kernel and used by the EFI code to call runtime services.
193 vm_paddr_t efi_systbl_phys;
195 /* Intel ICH registers */
196 #define ICH_PMBASE 0x400
197 #define ICH_SMI_EN ICH_PMBASE + 0x30
199 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
207 * The number of PHYSMAP entries must be one less than the number of
208 * PHYSSEG entries because the PHYSMAP entry that spans the largest
209 * physical address that is accessible by ISA DMA is split into two
212 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
214 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
215 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
217 /* must be 2 less so 0 0 can signal end of chunks */
218 #define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
219 #define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
221 struct kva_md_info kmi;
223 static struct trapframe proc0_tf;
224 struct region_descriptor r_gdt, r_idt;
226 struct pcpu __pcpu[MAXCPU];
230 struct mem_range_softc mem_range_softc;
232 struct mtx dt_lock; /* lock for GDT and LDT */
234 void (*vmm_resume_p)(void);
244 * On MacBooks, we need to disallow the legacy USB circuit to
245 * generate an SMI# because this can cause several problems,
246 * namely: incorrect CPU frequency detection and failure to
248 * We do this by disabling a bit in the SMI_EN (SMI Control and
249 * Enable register) of the Intel ICH LPC Interface Bridge.
251 sysenv = kern_getenv("smbios.system.product");
252 if (sysenv != NULL) {
253 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
254 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
255 strncmp(sysenv, "MacBook4,1", 10) == 0 ||
256 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
257 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
258 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
259 strncmp(sysenv, "MacBookPro4,1", 13) == 0 ||
260 strncmp(sysenv, "Macmini1,1", 10) == 0) {
262 printf("Disabling LEGACY_USB_EN bit on "
264 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
270 * Good {morning,afternoon,evening,night}.
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 update_pcb_bases(pcb);
378 sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase;
379 sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase;
380 bzero(sf.sf_uc.uc_mcontext.mc_spare,
381 sizeof(sf.sf_uc.uc_mcontext.mc_spare));
382 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
384 /* Allocate space for the signal handler context. */
385 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
386 SIGISMEMBER(psp->ps_sigonstack, sig)) {
387 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
388 #if defined(COMPAT_43)
389 td->td_sigstk.ss_flags |= SS_ONSTACK;
392 sp = (char *)regs->tf_rsp - 128;
393 if (xfpusave != NULL) {
395 sp = (char *)((unsigned long)sp & ~0x3Ful);
396 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
398 sp -= sizeof(struct sigframe);
399 /* Align to 16 bytes. */
400 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
402 /* Build the argument list for the signal handler. */
403 regs->tf_rdi = sig; /* arg 1 in %rdi */
404 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
405 bzero(&sf.sf_si, sizeof(sf.sf_si));
406 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
407 /* Signal handler installed with SA_SIGINFO. */
408 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
409 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
411 /* Fill in POSIX parts */
412 sf.sf_si = ksi->ksi_info;
413 sf.sf_si.si_signo = sig; /* maybe a translated signal */
414 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
416 /* Old FreeBSD-style arguments. */
417 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
418 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
419 sf.sf_ahu.sf_handler = catcher;
421 mtx_unlock(&psp->ps_mtx);
425 * Copy the sigframe out to the user's stack.
427 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
428 (xfpusave != NULL && copyout(xfpusave,
429 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
432 printf("process %ld has trashed its stack\n", (long)p->p_pid);
438 regs->tf_rsp = (long)sfp;
439 regs->tf_rip = p->p_sysent->sv_sigcode_base;
440 regs->tf_rflags &= ~(PSL_T | PSL_D);
441 regs->tf_cs = _ucodesel;
442 regs->tf_ds = _udatasel;
443 regs->tf_ss = _udatasel;
444 regs->tf_es = _udatasel;
445 regs->tf_fs = _ufssel;
446 regs->tf_gs = _ugssel;
447 regs->tf_flags = TF_HASSEGS;
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 update_pcb_bases(pcb);
554 pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase;
555 pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase;
557 #if defined(COMPAT_43)
558 if (ucp->uc_mcontext.mc_onstack & 1)
559 td->td_sigstk.ss_flags |= SS_ONSTACK;
561 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
564 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
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;
586 if (td->td_proc->p_md.md_ldt != NULL)
589 update_pcb_bases(pcb);
592 clear_pcb_flags(pcb, PCB_32BIT);
593 pcb->pcb_initial_fpucw = __INITIAL_FPUCW__;
595 bzero((char *)regs, sizeof(struct trapframe));
596 regs->tf_rip = imgp->entry_addr;
597 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
598 regs->tf_rdi = stack; /* argv */
599 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
600 regs->tf_ss = _udatasel;
601 regs->tf_cs = _ucodesel;
602 regs->tf_ds = _udatasel;
603 regs->tf_es = _udatasel;
604 regs->tf_fs = _ufssel;
605 regs->tf_gs = _ugssel;
606 regs->tf_flags = TF_HASSEGS;
609 * Reset the hardware debug registers if they were in use.
610 * They won't have any meaning for the newly exec'd process.
612 if (pcb->pcb_flags & PCB_DBREGS) {
621 * Clear the debug registers on the running
622 * CPU, otherwise they will end up affecting
623 * the next process we switch to.
627 clear_pcb_flags(pcb, PCB_DBREGS);
631 * Drop the FP state if we hold it, so that the process gets a
632 * clean FP state if it uses the FPU again.
644 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
645 * BSP. See the comments there about why we set them.
647 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
652 * Initialize amd64 and configure to run kernel
656 * Initialize segments & interrupt table
659 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
660 static struct gate_descriptor idt0[NIDT];
661 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
663 static char dblfault_stack[PAGE_SIZE] __aligned(16);
665 static char nmi0_stack[PAGE_SIZE] __aligned(16);
666 CTASSERT(sizeof(struct nmi_pcpu) == 16);
668 struct amd64tss common_tss[MAXCPU];
671 * Software prototypes -- in more palatable form.
673 * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same
674 * slots as corresponding segments for i386 kernel.
676 struct soft_segment_descriptor gdt_segs[] = {
677 /* GNULL_SEL 0 Null Descriptor */
686 /* GNULL2_SEL 1 Null Descriptor */
695 /* GUFS32_SEL 2 32 bit %gs Descriptor for user */
697 .ssd_limit = 0xfffff,
698 .ssd_type = SDT_MEMRWA,
704 /* GUGS32_SEL 3 32 bit %fs Descriptor for user */
706 .ssd_limit = 0xfffff,
707 .ssd_type = SDT_MEMRWA,
713 /* GCODE_SEL 4 Code Descriptor for kernel */
715 .ssd_limit = 0xfffff,
716 .ssd_type = SDT_MEMERA,
722 /* GDATA_SEL 5 Data Descriptor for kernel */
724 .ssd_limit = 0xfffff,
725 .ssd_type = SDT_MEMRWA,
731 /* GUCODE32_SEL 6 32 bit Code Descriptor for user */
733 .ssd_limit = 0xfffff,
734 .ssd_type = SDT_MEMERA,
740 /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */
742 .ssd_limit = 0xfffff,
743 .ssd_type = SDT_MEMRWA,
749 /* GUCODE_SEL 8 64 bit Code Descriptor for user */
751 .ssd_limit = 0xfffff,
752 .ssd_type = SDT_MEMERA,
758 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
760 .ssd_limit = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE - 1,
761 .ssd_type = SDT_SYSTSS,
767 /* Actually, the TSS is a system descriptor which is double size */
776 /* GUSERLDT_SEL 11 LDT Descriptor */
785 /* GUSERLDT_SEL 12 LDT Descriptor, double size */
797 setidt(int idx, inthand_t *func, int typ, int dpl, int ist)
799 struct gate_descriptor *ip;
802 ip->gd_looffset = (uintptr_t)func;
803 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
809 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
813 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
814 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
815 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
816 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
817 IDTVEC(xmm), IDTVEC(dblfault),
822 IDTVEC(xen_intr_upcall),
824 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
828 * Display the index and function name of any IDT entries that don't use
829 * the default 'rsvd' entry point.
831 DB_SHOW_COMMAND(idt, db_show_idt)
833 struct gate_descriptor *ip;
838 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
839 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
840 if (func != (uintptr_t)&IDTVEC(rsvd)) {
841 db_printf("%3d\t", idx);
842 db_printsym(func, DB_STGY_PROC);
849 /* Show privileged registers. */
850 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
855 } __packed idtr, gdtr;
858 __asm __volatile("sidt %0" : "=m" (idtr));
859 db_printf("idtr\t0x%016lx/%04x\n",
860 (u_long)idtr.base, (u_int)idtr.limit);
861 __asm __volatile("sgdt %0" : "=m" (gdtr));
862 db_printf("gdtr\t0x%016lx/%04x\n",
863 (u_long)gdtr.base, (u_int)gdtr.limit);
864 __asm __volatile("sldt %0" : "=r" (ldt));
865 db_printf("ldtr\t0x%04x\n", ldt);
866 __asm __volatile("str %0" : "=r" (tr));
867 db_printf("tr\t0x%04x\n", tr);
868 db_printf("cr0\t0x%016lx\n", rcr0());
869 db_printf("cr2\t0x%016lx\n", rcr2());
870 db_printf("cr3\t0x%016lx\n", rcr3());
871 db_printf("cr4\t0x%016lx\n", rcr4());
872 if (rcr4() & CR4_XSAVE)
873 db_printf("xcr0\t0x%016lx\n", rxcr(0));
874 db_printf("EFER\t0x%016lx\n", rdmsr(MSR_EFER));
875 if (cpu_feature2 & (CPUID2_VMX | CPUID2_SMX))
876 db_printf("FEATURES_CTL\t%016lx\n",
877 rdmsr(MSR_IA32_FEATURE_CONTROL));
878 db_printf("DEBUG_CTL\t0x%016lx\n", rdmsr(MSR_DEBUGCTLMSR));
879 db_printf("PAT\t0x%016lx\n", rdmsr(MSR_PAT));
880 db_printf("GSBASE\t0x%016lx\n", rdmsr(MSR_GSBASE));
883 DB_SHOW_COMMAND(dbregs, db_show_dbregs)
886 db_printf("dr0\t0x%016lx\n", rdr0());
887 db_printf("dr1\t0x%016lx\n", rdr1());
888 db_printf("dr2\t0x%016lx\n", rdr2());
889 db_printf("dr3\t0x%016lx\n", rdr3());
890 db_printf("dr6\t0x%016lx\n", rdr6());
891 db_printf("dr7\t0x%016lx\n", rdr7());
897 struct user_segment_descriptor *sd;
898 struct soft_segment_descriptor *ssd;
901 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
902 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
903 ssd->ssd_type = sd->sd_type;
904 ssd->ssd_dpl = sd->sd_dpl;
905 ssd->ssd_p = sd->sd_p;
906 ssd->ssd_long = sd->sd_long;
907 ssd->ssd_def32 = sd->sd_def32;
908 ssd->ssd_gran = sd->sd_gran;
913 struct soft_segment_descriptor *ssd;
914 struct user_segment_descriptor *sd;
917 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
918 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
919 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
920 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
921 sd->sd_type = ssd->ssd_type;
922 sd->sd_dpl = ssd->ssd_dpl;
923 sd->sd_p = ssd->ssd_p;
924 sd->sd_long = ssd->ssd_long;
925 sd->sd_def32 = ssd->ssd_def32;
926 sd->sd_gran = ssd->ssd_gran;
931 struct soft_segment_descriptor *ssd;
932 struct system_segment_descriptor *sd;
935 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
936 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
937 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
938 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
939 sd->sd_type = ssd->ssd_type;
940 sd->sd_dpl = ssd->ssd_dpl;
941 sd->sd_p = ssd->ssd_p;
942 sd->sd_gran = ssd->ssd_gran;
945 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
946 #include <isa/isavar.h>
947 #include <isa/isareg.h>
949 * Return a bitmap of the current interrupt requests. This is 8259-specific
950 * and is only suitable for use at probe time.
951 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
952 * It shouldn't be here. There should probably be an APIC centric
953 * implementation in the apic driver code, if at all.
956 isa_irq_pending(void)
963 return ((irr2 << 8) | irr1);
970 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
973 int i, insert_idx, physmap_idx;
975 physmap_idx = *physmap_idxp;
981 * Find insertion point while checking for overlap. Start off by
982 * assuming the new entry will be added to the end.
984 * NB: physmap_idx points to the next free slot.
986 insert_idx = physmap_idx;
987 for (i = 0; i <= physmap_idx; i += 2) {
988 if (base < physmap[i + 1]) {
989 if (base + length <= physmap[i]) {
993 if (boothowto & RB_VERBOSE)
995 "Overlapping memory regions, ignoring second region\n");
1000 /* See if we can prepend to the next entry. */
1001 if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) {
1002 physmap[insert_idx] = base;
1006 /* See if we can append to the previous entry. */
1007 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
1008 physmap[insert_idx - 1] += length;
1013 *physmap_idxp = physmap_idx;
1014 if (physmap_idx == PHYSMAP_SIZE) {
1016 "Too many segments in the physical address map, giving up\n");
1021 * Move the last 'N' entries down to make room for the new
1024 for (i = (physmap_idx - 2); i > insert_idx; i -= 2) {
1025 physmap[i] = physmap[i - 2];
1026 physmap[i + 1] = physmap[i - 1];
1029 /* Insert the new entry. */
1030 physmap[insert_idx] = base;
1031 physmap[insert_idx + 1] = base + length;
1036 bios_add_smap_entries(struct bios_smap *smapbase, u_int32_t smapsize,
1037 vm_paddr_t *physmap, int *physmap_idx)
1039 struct bios_smap *smap, *smapend;
1041 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1043 for (smap = smapbase; smap < smapend; smap++) {
1044 if (boothowto & RB_VERBOSE)
1045 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1046 smap->type, smap->base, smap->length);
1048 if (smap->type != SMAP_TYPE_MEMORY)
1051 if (!add_physmap_entry(smap->base, smap->length, physmap,
1058 add_efi_map_entries(struct efi_map_header *efihdr, vm_paddr_t *physmap,
1061 struct efi_md *map, *p;
1066 static const char *types[] = {
1072 "RuntimeServicesCode",
1073 "RuntimeServicesData",
1074 "ConventionalMemory",
1076 "ACPIReclaimMemory",
1079 "MemoryMappedIOPortSpace",
1085 * Memory map data provided by UEFI via the GetMemoryMap
1086 * Boot Services API.
1088 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
1089 map = (struct efi_md *)((uint8_t *)efihdr + efisz);
1091 if (efihdr->descriptor_size == 0)
1093 ndesc = efihdr->memory_size / efihdr->descriptor_size;
1095 if (boothowto & RB_VERBOSE)
1096 printf("%23s %12s %12s %8s %4s\n",
1097 "Type", "Physical", "Virtual", "#Pages", "Attr");
1099 for (i = 0, p = map; i < ndesc; i++,
1100 p = efi_next_descriptor(p, efihdr->descriptor_size)) {
1101 if (boothowto & RB_VERBOSE) {
1102 if (p->md_type < nitems(types))
1103 type = types[p->md_type];
1106 printf("%23s %012lx %12p %08lx ", type, p->md_phys,
1107 p->md_virt, p->md_pages);
1108 if (p->md_attr & EFI_MD_ATTR_UC)
1110 if (p->md_attr & EFI_MD_ATTR_WC)
1112 if (p->md_attr & EFI_MD_ATTR_WT)
1114 if (p->md_attr & EFI_MD_ATTR_WB)
1116 if (p->md_attr & EFI_MD_ATTR_UCE)
1118 if (p->md_attr & EFI_MD_ATTR_WP)
1120 if (p->md_attr & EFI_MD_ATTR_RP)
1122 if (p->md_attr & EFI_MD_ATTR_XP)
1124 if (p->md_attr & EFI_MD_ATTR_NV)
1126 if (p->md_attr & EFI_MD_ATTR_MORE_RELIABLE)
1127 printf("MORE_RELIABLE ");
1128 if (p->md_attr & EFI_MD_ATTR_RO)
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)
1483 vm_offset_t ksym_start;
1484 vm_offset_t ksym_end;
1487 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1488 preload_bootstrap_relocate(KERNBASE);
1489 kmdp = preload_search_by_type("elf kernel");
1491 kmdp = preload_search_by_type("elf64 kernel");
1492 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1493 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
1496 init_static_kenv(envp, 0);
1498 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1499 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1500 db_fetch_ksymtab(ksym_start, ksym_end);
1502 efi_systbl_phys = MD_FETCH(kmdp, MODINFOMD_FW_HANDLE, vm_paddr_t);
1508 amd64_kdb_init(void)
1512 if (boothowto & RB_KDB)
1513 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
1518 hammer_time(u_int64_t modulep, u_int64_t physfree)
1523 struct nmi_pcpu *np;
1524 struct xstate_hdr *xhdr;
1531 * This may be done better later if it gets more high level
1532 * components in it. If so just link td->td_proc here.
1534 proc_linkup0(&proc0, &thread0);
1536 kmdp = init_ops.parse_preload_data(modulep);
1539 identify_hypervisor();
1541 /* Init basic tunables, hz etc */
1544 thread0.td_kstack = physfree + KERNBASE;
1545 thread0.td_kstack_pages = kstack_pages;
1546 kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
1547 bzero((void *)thread0.td_kstack, kstack0_sz);
1548 physfree += kstack0_sz;
1551 * make gdt memory segments
1553 for (x = 0; x < NGDT; x++) {
1554 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1555 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1556 ssdtosd(&gdt_segs[x], &gdt[x]);
1558 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1559 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1560 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1562 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1563 r_gdt.rd_base = (long) gdt;
1567 wrmsr(MSR_FSBASE, 0); /* User value */
1568 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1569 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1571 pcpu_init(pc, 0, sizeof(struct pcpu));
1572 dpcpu_init((void *)(physfree + KERNBASE), 0);
1573 physfree += DPCPU_SIZE;
1574 PCPU_SET(prvspace, pc);
1575 PCPU_SET(curthread, &thread0);
1576 /* Non-late cninit() and printf() can be moved up to here. */
1577 PCPU_SET(tssp, &common_tss[0]);
1578 PCPU_SET(commontssp, &common_tss[0]);
1579 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1580 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1581 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1582 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1585 * Initialize mutexes.
1587 * icu_lock: in order to allow an interrupt to occur in a critical
1588 * section, to set pcpu->ipending (etc...) properly, we
1589 * must be able to get the icu lock, so it can't be
1593 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1594 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1597 for (x = 0; x < NIDT; x++)
1598 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1599 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1600 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1601 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1602 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1603 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1604 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1605 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1606 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1607 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1608 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1609 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1610 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1611 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1612 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1613 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1614 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1615 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1616 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1617 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1618 #ifdef KDTRACE_HOOKS
1619 setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
1622 setidt(IDT_EVTCHN, &IDTVEC(xen_intr_upcall), SDT_SYSIGT, SEL_UPL, 0);
1625 r_idt.rd_limit = sizeof(idt0) - 1;
1626 r_idt.rd_base = (long) idt;
1630 * Initialize the clock before the console so that console
1631 * initialization can use DELAY().
1636 * Use vt(4) by default for UEFI boot (during the sc(4)/vt(4)
1638 * Once bootblocks have updated, we can test directly for
1639 * efi_systbl != NULL here...
1641 if (preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP)
1643 vty_set_preferred(VTY_VT);
1645 finishidentcpu(); /* Final stage of CPU initialization */
1646 initializecpu(); /* Initialize CPU registers */
1647 initializecpucache();
1649 /* doublefault stack space, runs on ist1 */
1650 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1653 * NMI stack, runs on ist2. The pcpu pointer is stored just
1654 * above the start of the ist2 stack.
1656 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1657 np->np_pcpu = (register_t) pc;
1658 common_tss[0].tss_ist2 = (long) np;
1660 /* Set the IO permission bitmap (empty due to tss seg limit) */
1661 common_tss[0].tss_iobase = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE;
1663 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1666 /* Set up the fast syscall stuff */
1667 msr = rdmsr(MSR_EFER) | EFER_SCE;
1668 wrmsr(MSR_EFER, msr);
1669 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1670 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1671 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1672 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1673 wrmsr(MSR_STAR, msr);
1674 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1677 * Temporary forge some valid pointer to PCB, for exception
1678 * handlers. It is reinitialized properly below after FPU is
1679 * set up. Also set up td_critnest to short-cut the page
1682 cpu_max_ext_state_size = sizeof(struct savefpu);
1683 thread0.td_pcb = get_pcb_td(&thread0);
1684 thread0.td_critnest = 1;
1687 * The console and kdb should be initialized even earlier than here,
1688 * but some console drivers don't work until after getmemsize().
1689 * Default to late console initialization to support these drivers.
1690 * This loses mainly printf()s in getmemsize() and early debugging.
1693 TUNABLE_INT_FETCH("debug.late_console", &late_console);
1694 if (!late_console) {
1699 getmemsize(kmdp, physfree);
1700 init_param2(physmem);
1702 /* now running on new page tables, configured,and u/iom is accessible */
1712 /* Reset and mask the atpics and leave them shut down. */
1716 * Point the ICU spurious interrupt vectors at the APIC spurious
1717 * interrupt handler.
1719 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1720 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1723 #error "have you forgotten the isa device?";
1729 msgbufinit(msgbufp, msgbufsize);
1733 * Set up thread0 pcb after fpuinit calculated pcb + fpu save
1734 * area size. Zero out the extended state header in fpu save
1737 thread0.td_pcb = get_pcb_td(&thread0);
1738 thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
1739 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
1741 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
1743 xhdr->xstate_bv = xsave_mask;
1745 /* make an initial tss so cpu can get interrupt stack on syscall! */
1746 common_tss[0].tss_rsp0 = (vm_offset_t)thread0.td_pcb;
1747 /* Ensure the stack is aligned to 16 bytes */
1748 common_tss[0].tss_rsp0 &= ~0xFul;
1749 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1750 PCPU_SET(curpcb, thread0.td_pcb);
1752 /* transfer to user mode */
1754 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1755 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1756 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1757 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
1758 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
1764 /* setup proc 0's pcb */
1765 thread0.td_pcb->pcb_flags = 0;
1766 thread0.td_frame = &proc0_tf;
1768 env = kern_getenv("kernelname");
1770 strlcpy(kernelname, env, sizeof(kernelname));
1777 thread0.td_critnest = 0;
1779 /* Location of kernel stack for locore */
1780 return ((u_int64_t)thread0.td_pcb);
1784 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1787 pcpu->pc_acpi_id = 0xffffffff;
1791 smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
1793 struct bios_smap *smapbase;
1794 struct bios_smap_xattr smap;
1797 int count, error, i;
1799 /* Retrieve the system memory map from the loader. */
1800 kmdp = preload_search_by_type("elf kernel");
1802 kmdp = preload_search_by_type("elf64 kernel");
1803 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1804 MODINFO_METADATA | MODINFOMD_SMAP);
1805 if (smapbase == NULL)
1807 smapattr = (uint32_t *)preload_search_info(kmdp,
1808 MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
1809 count = *((uint32_t *)smapbase - 1) / sizeof(*smapbase);
1811 for (i = 0; i < count; i++) {
1812 smap.base = smapbase[i].base;
1813 smap.length = smapbase[i].length;
1814 smap.type = smapbase[i].type;
1815 if (smapattr != NULL)
1816 smap.xattr = smapattr[i];
1819 error = SYSCTL_OUT(req, &smap, sizeof(smap));
1823 SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
1824 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
1827 efi_map_sysctl_handler(SYSCTL_HANDLER_ARGS)
1829 struct efi_map_header *efihdr;
1833 kmdp = preload_search_by_type("elf kernel");
1835 kmdp = preload_search_by_type("elf64 kernel");
1836 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1837 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1840 efisize = *((uint32_t *)efihdr - 1);
1841 return (SYSCTL_OUT(req, efihdr, efisize));
1843 SYSCTL_PROC(_machdep, OID_AUTO, efi_map, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
1844 efi_map_sysctl_handler, "S,efi_map_header", "Raw EFI Memory Map");
1847 spinlock_enter(void)
1853 if (td->td_md.md_spinlock_count == 0) {
1854 flags = intr_disable();
1855 td->td_md.md_spinlock_count = 1;
1856 td->td_md.md_saved_flags = flags;
1859 td->td_md.md_spinlock_count++;
1869 flags = td->td_md.md_saved_flags;
1870 td->td_md.md_spinlock_count--;
1871 if (td->td_md.md_spinlock_count == 0) {
1873 intr_restore(flags);
1878 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1879 * we want to start a backtrace from the function that caused us to enter
1880 * the debugger. We have the context in the trapframe, but base the trace
1881 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1882 * enough for a backtrace.
1885 makectx(struct trapframe *tf, struct pcb *pcb)
1888 pcb->pcb_r12 = tf->tf_r12;
1889 pcb->pcb_r13 = tf->tf_r13;
1890 pcb->pcb_r14 = tf->tf_r14;
1891 pcb->pcb_r15 = tf->tf_r15;
1892 pcb->pcb_rbp = tf->tf_rbp;
1893 pcb->pcb_rbx = tf->tf_rbx;
1894 pcb->pcb_rip = tf->tf_rip;
1895 pcb->pcb_rsp = tf->tf_rsp;
1899 ptrace_set_pc(struct thread *td, unsigned long addr)
1902 td->td_frame->tf_rip = addr;
1903 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
1908 ptrace_single_step(struct thread *td)
1910 td->td_frame->tf_rflags |= PSL_T;
1915 ptrace_clear_single_step(struct thread *td)
1917 td->td_frame->tf_rflags &= ~PSL_T;
1922 fill_regs(struct thread *td, struct reg *regs)
1924 struct trapframe *tp;
1927 return (fill_frame_regs(tp, regs));
1931 fill_frame_regs(struct trapframe *tp, struct reg *regs)
1933 regs->r_r15 = tp->tf_r15;
1934 regs->r_r14 = tp->tf_r14;
1935 regs->r_r13 = tp->tf_r13;
1936 regs->r_r12 = tp->tf_r12;
1937 regs->r_r11 = tp->tf_r11;
1938 regs->r_r10 = tp->tf_r10;
1939 regs->r_r9 = tp->tf_r9;
1940 regs->r_r8 = tp->tf_r8;
1941 regs->r_rdi = tp->tf_rdi;
1942 regs->r_rsi = tp->tf_rsi;
1943 regs->r_rbp = tp->tf_rbp;
1944 regs->r_rbx = tp->tf_rbx;
1945 regs->r_rdx = tp->tf_rdx;
1946 regs->r_rcx = tp->tf_rcx;
1947 regs->r_rax = tp->tf_rax;
1948 regs->r_rip = tp->tf_rip;
1949 regs->r_cs = tp->tf_cs;
1950 regs->r_rflags = tp->tf_rflags;
1951 regs->r_rsp = tp->tf_rsp;
1952 regs->r_ss = tp->tf_ss;
1953 if (tp->tf_flags & TF_HASSEGS) {
1954 regs->r_ds = tp->tf_ds;
1955 regs->r_es = tp->tf_es;
1956 regs->r_fs = tp->tf_fs;
1957 regs->r_gs = tp->tf_gs;
1968 set_regs(struct thread *td, struct reg *regs)
1970 struct trapframe *tp;
1974 rflags = regs->r_rflags & 0xffffffff;
1975 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
1977 tp->tf_r15 = regs->r_r15;
1978 tp->tf_r14 = regs->r_r14;
1979 tp->tf_r13 = regs->r_r13;
1980 tp->tf_r12 = regs->r_r12;
1981 tp->tf_r11 = regs->r_r11;
1982 tp->tf_r10 = regs->r_r10;
1983 tp->tf_r9 = regs->r_r9;
1984 tp->tf_r8 = regs->r_r8;
1985 tp->tf_rdi = regs->r_rdi;
1986 tp->tf_rsi = regs->r_rsi;
1987 tp->tf_rbp = regs->r_rbp;
1988 tp->tf_rbx = regs->r_rbx;
1989 tp->tf_rdx = regs->r_rdx;
1990 tp->tf_rcx = regs->r_rcx;
1991 tp->tf_rax = regs->r_rax;
1992 tp->tf_rip = regs->r_rip;
1993 tp->tf_cs = regs->r_cs;
1994 tp->tf_rflags = rflags;
1995 tp->tf_rsp = regs->r_rsp;
1996 tp->tf_ss = regs->r_ss;
1997 if (0) { /* XXXKIB */
1998 tp->tf_ds = regs->r_ds;
1999 tp->tf_es = regs->r_es;
2000 tp->tf_fs = regs->r_fs;
2001 tp->tf_gs = regs->r_gs;
2002 tp->tf_flags = TF_HASSEGS;
2004 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
2008 /* XXX check all this stuff! */
2009 /* externalize from sv_xmm */
2011 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
2013 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2014 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2018 bzero(fpregs, sizeof(*fpregs));
2020 /* FPU control/status */
2021 penv_fpreg->en_cw = penv_xmm->en_cw;
2022 penv_fpreg->en_sw = penv_xmm->en_sw;
2023 penv_fpreg->en_tw = penv_xmm->en_tw;
2024 penv_fpreg->en_opcode = penv_xmm->en_opcode;
2025 penv_fpreg->en_rip = penv_xmm->en_rip;
2026 penv_fpreg->en_rdp = penv_xmm->en_rdp;
2027 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
2028 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
2031 for (i = 0; i < 8; ++i)
2032 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
2035 for (i = 0; i < 16; ++i)
2036 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
2039 /* internalize from fpregs into sv_xmm */
2041 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
2043 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2044 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2048 /* FPU control/status */
2049 penv_xmm->en_cw = penv_fpreg->en_cw;
2050 penv_xmm->en_sw = penv_fpreg->en_sw;
2051 penv_xmm->en_tw = penv_fpreg->en_tw;
2052 penv_xmm->en_opcode = penv_fpreg->en_opcode;
2053 penv_xmm->en_rip = penv_fpreg->en_rip;
2054 penv_xmm->en_rdp = penv_fpreg->en_rdp;
2055 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
2056 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
2059 for (i = 0; i < 8; ++i)
2060 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
2063 for (i = 0; i < 16; ++i)
2064 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
2067 /* externalize from td->pcb */
2069 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2072 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2073 P_SHOULDSTOP(td->td_proc),
2074 ("not suspended thread %p", td));
2076 fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs);
2080 /* internalize to td->pcb */
2082 set_fpregs(struct thread *td, struct fpreg *fpregs)
2085 set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
2091 * Get machine context.
2094 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2097 struct trapframe *tp;
2101 PROC_LOCK(curthread->td_proc);
2102 mcp->mc_onstack = sigonstack(tp->tf_rsp);
2103 PROC_UNLOCK(curthread->td_proc);
2104 mcp->mc_r15 = tp->tf_r15;
2105 mcp->mc_r14 = tp->tf_r14;
2106 mcp->mc_r13 = tp->tf_r13;
2107 mcp->mc_r12 = tp->tf_r12;
2108 mcp->mc_r11 = tp->tf_r11;
2109 mcp->mc_r10 = tp->tf_r10;
2110 mcp->mc_r9 = tp->tf_r9;
2111 mcp->mc_r8 = tp->tf_r8;
2112 mcp->mc_rdi = tp->tf_rdi;
2113 mcp->mc_rsi = tp->tf_rsi;
2114 mcp->mc_rbp = tp->tf_rbp;
2115 mcp->mc_rbx = tp->tf_rbx;
2116 mcp->mc_rcx = tp->tf_rcx;
2117 mcp->mc_rflags = tp->tf_rflags;
2118 if (flags & GET_MC_CLEAR_RET) {
2121 mcp->mc_rflags &= ~PSL_C;
2123 mcp->mc_rax = tp->tf_rax;
2124 mcp->mc_rdx = tp->tf_rdx;
2126 mcp->mc_rip = tp->tf_rip;
2127 mcp->mc_cs = tp->tf_cs;
2128 mcp->mc_rsp = tp->tf_rsp;
2129 mcp->mc_ss = tp->tf_ss;
2130 mcp->mc_ds = tp->tf_ds;
2131 mcp->mc_es = tp->tf_es;
2132 mcp->mc_fs = tp->tf_fs;
2133 mcp->mc_gs = tp->tf_gs;
2134 mcp->mc_flags = tp->tf_flags;
2135 mcp->mc_len = sizeof(*mcp);
2136 get_fpcontext(td, mcp, NULL, 0);
2137 update_pcb_bases(pcb);
2138 mcp->mc_fsbase = pcb->pcb_fsbase;
2139 mcp->mc_gsbase = pcb->pcb_gsbase;
2140 mcp->mc_xfpustate = 0;
2141 mcp->mc_xfpustate_len = 0;
2142 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
2147 * Set machine context.
2149 * However, we don't set any but the user modifiable flags, and we won't
2150 * touch the cs selector.
2153 set_mcontext(struct thread *td, mcontext_t *mcp)
2156 struct trapframe *tp;
2163 if (mcp->mc_len != sizeof(*mcp) ||
2164 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2166 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2167 (tp->tf_rflags & ~PSL_USERCHANGE);
2168 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2169 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2170 sizeof(struct savefpu))
2172 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2173 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2174 mcp->mc_xfpustate_len);
2179 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2182 tp->tf_r15 = mcp->mc_r15;
2183 tp->tf_r14 = mcp->mc_r14;
2184 tp->tf_r13 = mcp->mc_r13;
2185 tp->tf_r12 = mcp->mc_r12;
2186 tp->tf_r11 = mcp->mc_r11;
2187 tp->tf_r10 = mcp->mc_r10;
2188 tp->tf_r9 = mcp->mc_r9;
2189 tp->tf_r8 = mcp->mc_r8;
2190 tp->tf_rdi = mcp->mc_rdi;
2191 tp->tf_rsi = mcp->mc_rsi;
2192 tp->tf_rbp = mcp->mc_rbp;
2193 tp->tf_rbx = mcp->mc_rbx;
2194 tp->tf_rdx = mcp->mc_rdx;
2195 tp->tf_rcx = mcp->mc_rcx;
2196 tp->tf_rax = mcp->mc_rax;
2197 tp->tf_rip = mcp->mc_rip;
2198 tp->tf_rflags = rflags;
2199 tp->tf_rsp = mcp->mc_rsp;
2200 tp->tf_ss = mcp->mc_ss;
2201 tp->tf_flags = mcp->mc_flags;
2202 if (tp->tf_flags & TF_HASSEGS) {
2203 tp->tf_ds = mcp->mc_ds;
2204 tp->tf_es = mcp->mc_es;
2205 tp->tf_fs = mcp->mc_fs;
2206 tp->tf_gs = mcp->mc_gs;
2208 set_pcb_flags(pcb, PCB_FULL_IRET);
2209 if (mcp->mc_flags & _MC_HASBASES) {
2210 pcb->pcb_fsbase = mcp->mc_fsbase;
2211 pcb->pcb_gsbase = mcp->mc_gsbase;
2217 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2218 size_t xfpusave_len)
2220 size_t max_len, len;
2222 mcp->mc_ownedfp = fpugetregs(td);
2223 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
2224 sizeof(mcp->mc_fpstate));
2225 mcp->mc_fpformat = fpuformat();
2226 if (!use_xsave || xfpusave_len == 0)
2228 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
2230 if (len > max_len) {
2232 bzero(xfpusave + max_len, len - max_len);
2234 mcp->mc_flags |= _MC_HASFPXSTATE;
2235 mcp->mc_xfpustate_len = len;
2236 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
2240 set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate,
2241 size_t xfpustate_len)
2245 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2247 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2249 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
2250 /* We don't care what state is left in the FPU or PCB. */
2253 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2254 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2255 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate,
2256 xfpustate, xfpustate_len);
2263 fpstate_drop(struct thread *td)
2266 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
2268 if (PCPU_GET(fpcurthread) == td)
2271 * XXX force a full drop of the fpu. The above only drops it if we
2274 * XXX I don't much like fpugetuserregs()'s semantics of doing a full
2275 * drop. Dropping only to the pcb matches fnsave's behaviour.
2276 * We only need to drop to !PCB_INITDONE in sendsig(). But
2277 * sendsig() is the only caller of fpugetuserregs()... perhaps we just
2278 * have too many layers.
2280 clear_pcb_flags(curthread->td_pcb,
2281 PCB_FPUINITDONE | PCB_USERFPUINITDONE);
2286 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2291 dbregs->dr[0] = rdr0();
2292 dbregs->dr[1] = rdr1();
2293 dbregs->dr[2] = rdr2();
2294 dbregs->dr[3] = rdr3();
2295 dbregs->dr[6] = rdr6();
2296 dbregs->dr[7] = rdr7();
2299 dbregs->dr[0] = pcb->pcb_dr0;
2300 dbregs->dr[1] = pcb->pcb_dr1;
2301 dbregs->dr[2] = pcb->pcb_dr2;
2302 dbregs->dr[3] = pcb->pcb_dr3;
2303 dbregs->dr[6] = pcb->pcb_dr6;
2304 dbregs->dr[7] = pcb->pcb_dr7;
2320 set_dbregs(struct thread *td, struct dbreg *dbregs)
2326 load_dr0(dbregs->dr[0]);
2327 load_dr1(dbregs->dr[1]);
2328 load_dr2(dbregs->dr[2]);
2329 load_dr3(dbregs->dr[3]);
2330 load_dr6(dbregs->dr[6]);
2331 load_dr7(dbregs->dr[7]);
2334 * Don't let an illegal value for dr7 get set. Specifically,
2335 * check for undefined settings. Setting these bit patterns
2336 * result in undefined behaviour and can lead to an unexpected
2337 * TRCTRAP or a general protection fault right here.
2338 * Upper bits of dr6 and dr7 must not be set
2340 for (i = 0; i < 4; i++) {
2341 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2343 if (td->td_frame->tf_cs == _ucode32sel &&
2344 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2347 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2348 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2354 * Don't let a process set a breakpoint that is not within the
2355 * process's address space. If a process could do this, it
2356 * could halt the system by setting a breakpoint in the kernel
2357 * (if ddb was enabled). Thus, we need to check to make sure
2358 * that no breakpoints are being enabled for addresses outside
2359 * process's address space.
2361 * XXX - what about when the watched area of the user's
2362 * address space is written into from within the kernel
2363 * ... wouldn't that still cause a breakpoint to be generated
2364 * from within kernel mode?
2367 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2368 /* dr0 is enabled */
2369 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2372 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2373 /* dr1 is enabled */
2374 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2377 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2378 /* dr2 is enabled */
2379 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2382 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2383 /* dr3 is enabled */
2384 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2388 pcb->pcb_dr0 = dbregs->dr[0];
2389 pcb->pcb_dr1 = dbregs->dr[1];
2390 pcb->pcb_dr2 = dbregs->dr[2];
2391 pcb->pcb_dr3 = dbregs->dr[3];
2392 pcb->pcb_dr6 = dbregs->dr[6];
2393 pcb->pcb_dr7 = dbregs->dr[7];
2395 set_pcb_flags(pcb, PCB_DBREGS);
2405 load_dr7(0); /* Turn off the control bits first */
2414 * Return > 0 if a hardware breakpoint has been hit, and the
2415 * breakpoint was in user space. Return 0, otherwise.
2418 user_dbreg_trap(void)
2420 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2421 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2422 int nbp; /* number of breakpoints that triggered */
2423 caddr_t addr[4]; /* breakpoint addresses */
2427 if ((dr7 & 0x000000ff) == 0) {
2429 * all GE and LE bits in the dr7 register are zero,
2430 * thus the trap couldn't have been caused by the
2431 * hardware debug registers
2438 bp = dr6 & 0x0000000f;
2442 * None of the breakpoint bits are set meaning this
2443 * trap was not caused by any of the debug registers
2449 * at least one of the breakpoints were hit, check to see
2450 * which ones and if any of them are user space addresses
2454 addr[nbp++] = (caddr_t)rdr0();
2457 addr[nbp++] = (caddr_t)rdr1();
2460 addr[nbp++] = (caddr_t)rdr2();
2463 addr[nbp++] = (caddr_t)rdr3();
2466 for (i = 0; i < nbp; i++) {
2467 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2469 * addr[i] is in user space
2476 * None of the breakpoints are in user space.
2482 * The pcb_flags is only modified by current thread, or by other threads
2483 * when current thread is stopped. However, current thread may change it
2484 * from the interrupt context in cpu_switch(), or in the trap handler.
2485 * When we read-modify-write pcb_flags from C sources, compiler may generate
2486 * code that is not atomic regarding the interrupt handler. If a trap or
2487 * interrupt happens and any flag is modified from the handler, it can be
2488 * clobbered with the cached value later. Therefore, we implement setting
2489 * and clearing flags with single-instruction functions, which do not race
2490 * with possible modification of the flags from the trap or interrupt context,
2491 * because traps and interrupts are executed only on instruction boundary.
2494 set_pcb_flags_raw(struct pcb *pcb, const u_int flags)
2497 __asm __volatile("orl %1,%0"
2498 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags)
2504 * The support for RDFSBASE, WRFSBASE and similar instructions for %gs
2505 * base requires that kernel saves MSR_FSBASE and MSR_{K,}GSBASE into
2506 * pcb if user space modified the bases. We must save on the context
2507 * switch or if the return to usermode happens through the doreti.
2509 * Tracking of both events is performed by the pcb flag PCB_FULL_IRET,
2510 * which have a consequence that the base MSRs must be saved each time
2511 * the PCB_FULL_IRET flag is set. We disable interrupts to sync with
2515 set_pcb_flags(struct pcb *pcb, const u_int flags)
2519 if (curpcb == pcb &&
2520 (flags & PCB_FULL_IRET) != 0 &&
2521 (pcb->pcb_flags & PCB_FULL_IRET) == 0 &&
2522 (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0) {
2524 if ((pcb->pcb_flags & PCB_FULL_IRET) == 0) {
2525 if (rfs() == _ufssel)
2526 pcb->pcb_fsbase = rdfsbase();
2527 if (rgs() == _ugssel)
2528 pcb->pcb_gsbase = rdmsr(MSR_KGSBASE);
2530 set_pcb_flags_raw(pcb, flags);
2533 set_pcb_flags_raw(pcb, flags);
2538 clear_pcb_flags(struct pcb *pcb, const u_int flags)
2541 __asm __volatile("andl %1,%0"
2542 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags)
2549 * Provide inb() and outb() as functions. They are normally only available as
2550 * inline functions, thus cannot be called from the debugger.
2553 /* silence compiler warnings */
2554 u_char inb_(u_short);
2555 void outb_(u_short, u_char);
2564 outb_(u_short port, u_char data)