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"
51 #include "opt_kstack_pages.h"
52 #include "opt_maxmem.h"
53 #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>
104 #include <vm/vm_phys.h>
108 #error KDB must be enabled in order for DDB to work!
111 #include <ddb/db_sym.h>
114 #include <net/netisr.h>
116 #include <machine/clock.h>
117 #include <machine/cpu.h>
118 #include <machine/cputypes.h>
119 #include <machine/frame.h>
120 #include <machine/intr_machdep.h>
122 #include <machine/md_var.h>
123 #include <machine/metadata.h>
124 #include <machine/mp_watchdog.h>
125 #include <machine/pc/bios.h>
126 #include <machine/pcb.h>
127 #include <machine/proc.h>
128 #include <machine/reg.h>
129 #include <machine/sigframe.h>
130 #include <machine/specialreg.h>
131 #include <machine/trap.h>
132 #include <machine/tss.h>
134 #include <machine/smp.h>
141 #include <x86/isa/icu.h>
143 #include <x86/apicvar.h>
146 #include <isa/isareg.h>
148 #include <x86/init.h>
150 /* Sanity check for __curthread() */
151 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
154 * The PTI trampoline stack needs enough space for a hardware trapframe and a
155 * couple of scratch registers, as well as the trapframe left behind after an
158 CTASSERT(PC_PTI_STACK_SZ * sizeof(register_t) >= 2 * sizeof(struct pti_frame) -
159 offsetof(struct pti_frame, pti_rip));
161 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
163 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
164 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
166 static void cpu_startup(void *);
167 static void get_fpcontext(struct thread *td, mcontext_t *mcp,
168 char *xfpusave, size_t xfpusave_len);
169 static int set_fpcontext(struct thread *td, mcontext_t *mcp,
170 char *xfpustate, size_t xfpustate_len);
171 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
173 /* Preload data parse function */
174 static caddr_t native_parse_preload_data(u_int64_t);
176 /* Native function to fetch and parse the e820 map */
177 static void native_parse_memmap(caddr_t, vm_paddr_t *, int *);
179 /* Default init_ops implementation. */
180 struct init_ops init_ops = {
181 .parse_preload_data = native_parse_preload_data,
182 .early_clock_source_init = i8254_init,
183 .early_delay = i8254_delay,
184 .parse_memmap = native_parse_memmap,
186 .mp_bootaddress = mp_bootaddress,
187 .start_all_aps = native_start_all_aps,
190 .msi_init = msi_init,
195 * Physical address of the EFI System Table. Stashed from the metadata hints
196 * passed into the kernel and used by the EFI code to call runtime services.
198 vm_paddr_t efi_systbl_phys;
200 /* Intel ICH registers */
201 #define ICH_PMBASE 0x400
202 #define ICH_SMI_EN ICH_PMBASE + 0x30
204 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
212 * The number of PHYSMAP entries must be one less than the number of
213 * PHYSSEG entries because the PHYSMAP entry that spans the largest
214 * physical address that is accessible by ISA DMA is split into two
217 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
219 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
220 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
222 /* must be 2 less so 0 0 can signal end of chunks */
223 #define PHYS_AVAIL_ARRAY_END (nitems(phys_avail) - 2)
224 #define DUMP_AVAIL_ARRAY_END (nitems(dump_avail) - 2)
226 struct kva_md_info kmi;
228 static struct trapframe proc0_tf;
229 struct region_descriptor r_gdt, r_idt;
231 struct pcpu __pcpu[MAXCPU];
235 struct mem_range_softc mem_range_softc;
237 struct mtx dt_lock; /* lock for GDT and LDT */
239 void (*vmm_resume_p)(void);
249 * On MacBooks, we need to disallow the legacy USB circuit to
250 * generate an SMI# because this can cause several problems,
251 * namely: incorrect CPU frequency detection and failure to
253 * We do this by disabling a bit in the SMI_EN (SMI Control and
254 * Enable register) of the Intel ICH LPC Interface Bridge.
256 sysenv = kern_getenv("smbios.system.product");
257 if (sysenv != NULL) {
258 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
259 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
260 strncmp(sysenv, "MacBook4,1", 10) == 0 ||
261 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
262 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
263 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
264 strncmp(sysenv, "MacBookPro4,1", 13) == 0 ||
265 strncmp(sysenv, "Macmini1,1", 10) == 0) {
267 printf("Disabling LEGACY_USB_EN bit on "
269 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
275 * Good {morning,afternoon,evening,night}.
281 * Display physical memory if SMBIOS reports reasonable amount.
284 sysenv = kern_getenv("smbios.memory.enabled");
285 if (sysenv != NULL) {
286 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
289 if (memsize < ptoa((uintmax_t)vm_free_count()))
290 memsize = ptoa((uintmax_t)Maxmem);
291 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
292 realmem = atop(memsize);
295 * Display any holes after the first chunk of extended memory.
300 printf("Physical memory chunk(s):\n");
301 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
304 size = phys_avail[indx + 1] - phys_avail[indx];
306 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
307 (uintmax_t)phys_avail[indx],
308 (uintmax_t)phys_avail[indx + 1] - 1,
309 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
313 vm_ksubmap_init(&kmi);
315 printf("avail memory = %ju (%ju MB)\n",
316 ptoa((uintmax_t)vm_free_count()),
317 ptoa((uintmax_t)vm_free_count()) / 1048576);
320 * Set up buffers, so they can be used to read disk labels.
323 vm_pager_bufferinit();
329 * Send an interrupt to process.
331 * Stack is set up to allow sigcode stored
332 * at top to call routine, followed by call
333 * to sigreturn routine below. After sigreturn
334 * resets the signal mask, the stack, and the
335 * frame pointer, it returns to the user
339 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
341 struct sigframe sf, *sfp;
347 struct trapframe *regs;
356 PROC_LOCK_ASSERT(p, MA_OWNED);
357 sig = ksi->ksi_signo;
359 mtx_assert(&psp->ps_mtx, MA_OWNED);
361 oonstack = sigonstack(regs->tf_rsp);
363 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
364 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
365 xfpusave = __builtin_alloca(xfpusave_len);
371 /* Save user context. */
372 bzero(&sf, sizeof(sf));
373 sf.sf_uc.uc_sigmask = *mask;
374 sf.sf_uc.uc_stack = td->td_sigstk;
375 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
376 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
377 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
378 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
379 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
380 get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
382 update_pcb_bases(pcb);
383 sf.sf_uc.uc_mcontext.mc_fsbase = pcb->pcb_fsbase;
384 sf.sf_uc.uc_mcontext.mc_gsbase = pcb->pcb_gsbase;
385 bzero(sf.sf_uc.uc_mcontext.mc_spare,
386 sizeof(sf.sf_uc.uc_mcontext.mc_spare));
387 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
389 /* Allocate space for the signal handler context. */
390 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
391 SIGISMEMBER(psp->ps_sigonstack, sig)) {
392 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
393 #if defined(COMPAT_43)
394 td->td_sigstk.ss_flags |= SS_ONSTACK;
397 sp = (char *)regs->tf_rsp - 128;
398 if (xfpusave != NULL) {
400 sp = (char *)((unsigned long)sp & ~0x3Ful);
401 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
403 sp -= sizeof(struct sigframe);
404 /* Align to 16 bytes. */
405 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
407 /* Build the argument list for the signal handler. */
408 regs->tf_rdi = sig; /* arg 1 in %rdi */
409 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
410 bzero(&sf.sf_si, sizeof(sf.sf_si));
411 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
412 /* Signal handler installed with SA_SIGINFO. */
413 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
414 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
416 /* Fill in POSIX parts */
417 sf.sf_si = ksi->ksi_info;
418 sf.sf_si.si_signo = sig; /* maybe a translated signal */
419 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
421 /* Old FreeBSD-style arguments. */
422 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
423 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
424 sf.sf_ahu.sf_handler = catcher;
426 mtx_unlock(&psp->ps_mtx);
430 * Copy the sigframe out to the user's stack.
432 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
433 (xfpusave != NULL && copyout(xfpusave,
434 (void *)sf.sf_uc.uc_mcontext.mc_xfpustate, xfpusave_len)
437 printf("process %ld has trashed its stack\n", (long)p->p_pid);
443 regs->tf_rsp = (long)sfp;
444 regs->tf_rip = p->p_sysent->sv_sigcode_base;
445 regs->tf_rflags &= ~(PSL_T | PSL_D);
446 regs->tf_cs = _ucodesel;
447 regs->tf_ds = _udatasel;
448 regs->tf_ss = _udatasel;
449 regs->tf_es = _udatasel;
450 regs->tf_fs = _ufssel;
451 regs->tf_gs = _ugssel;
452 regs->tf_flags = TF_HASSEGS;
454 mtx_lock(&psp->ps_mtx);
458 * System call to cleanup state after a signal
459 * has been taken. Reset signal mask and
460 * stack state from context left by sendsig (above).
461 * Return to previous pc and psl as specified by
462 * context left by sendsig. Check carefully to
463 * make sure that the user has not modified the
464 * state to gain improper privileges.
469 sys_sigreturn(td, uap)
471 struct sigreturn_args /* {
472 const struct __ucontext *sigcntxp;
478 struct trapframe *regs;
481 size_t xfpustate_len;
489 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
491 uprintf("pid %d (%s): sigreturn copyin failed\n",
492 p->p_pid, td->td_name);
496 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
497 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
498 td->td_name, ucp->uc_mcontext.mc_flags);
502 rflags = ucp->uc_mcontext.mc_rflags;
504 * Don't allow users to change privileged or reserved flags.
506 if (!EFL_SECURE(rflags, regs->tf_rflags)) {
507 uprintf("pid %d (%s): sigreturn rflags = 0x%lx\n", p->p_pid,
508 td->td_name, rflags);
513 * Don't allow users to load a valid privileged %cs. Let the
514 * hardware check for invalid selectors, excess privilege in
515 * other selectors, invalid %eip's and invalid %esp's.
517 cs = ucp->uc_mcontext.mc_cs;
518 if (!CS_SECURE(cs)) {
519 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", p->p_pid,
521 ksiginfo_init_trap(&ksi);
522 ksi.ksi_signo = SIGBUS;
523 ksi.ksi_code = BUS_OBJERR;
524 ksi.ksi_trapno = T_PROTFLT;
525 ksi.ksi_addr = (void *)regs->tf_rip;
526 trapsignal(td, &ksi);
530 if ((uc.uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
531 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
532 if (xfpustate_len > cpu_max_ext_state_size -
533 sizeof(struct savefpu)) {
534 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
535 p->p_pid, td->td_name, xfpustate_len);
538 xfpustate = __builtin_alloca(xfpustate_len);
539 error = copyin((const void *)uc.uc_mcontext.mc_xfpustate,
540 xfpustate, xfpustate_len);
543 "pid %d (%s): sigreturn copying xfpustate failed\n",
544 p->p_pid, td->td_name);
551 ret = set_fpcontext(td, &ucp->uc_mcontext, xfpustate, xfpustate_len);
553 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
554 p->p_pid, td->td_name, ret);
557 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
558 update_pcb_bases(pcb);
559 pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase;
560 pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase;
562 #if defined(COMPAT_43)
563 if (ucp->uc_mcontext.mc_onstack & 1)
564 td->td_sigstk.ss_flags |= SS_ONSTACK;
566 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
569 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
570 return (EJUSTRETURN);
573 #ifdef COMPAT_FREEBSD4
575 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
578 return sys_sigreturn(td, (struct sigreturn_args *)uap);
583 * Reset registers to default values on exec.
586 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
588 struct trapframe *regs;
590 register_t saved_rflags;
595 if (td->td_proc->p_md.md_ldt != NULL)
598 update_pcb_bases(pcb);
601 clear_pcb_flags(pcb, PCB_32BIT);
602 pcb->pcb_initial_fpucw = __INITIAL_FPUCW__;
604 saved_rflags = regs->tf_rflags & PSL_T;
605 bzero((char *)regs, sizeof(struct trapframe));
606 regs->tf_rip = imgp->entry_addr;
607 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
608 regs->tf_rdi = stack; /* argv */
609 regs->tf_rflags = PSL_USER | saved_rflags;
610 regs->tf_ss = _udatasel;
611 regs->tf_cs = _ucodesel;
612 regs->tf_ds = _udatasel;
613 regs->tf_es = _udatasel;
614 regs->tf_fs = _ufssel;
615 regs->tf_gs = _ugssel;
616 regs->tf_flags = TF_HASSEGS;
619 * Reset the hardware debug registers if they were in use.
620 * They won't have any meaning for the newly exec'd process.
622 if (pcb->pcb_flags & PCB_DBREGS) {
631 * Clear the debug registers on the running
632 * CPU, otherwise they will end up affecting
633 * the next process we switch to.
637 clear_pcb_flags(pcb, PCB_DBREGS);
641 * Drop the FP state if we hold it, so that the process gets a
642 * clean FP state if it uses the FPU again.
654 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
655 * BSP. See the comments there about why we set them.
657 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
662 * Initialize amd64 and configure to run kernel
666 * Initialize segments & interrupt table
669 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
670 static struct gate_descriptor idt0[NIDT];
671 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
673 static char dblfault_stack[PAGE_SIZE] __aligned(16);
674 static char mce0_stack[PAGE_SIZE] __aligned(16);
675 static char nmi0_stack[PAGE_SIZE] __aligned(16);
676 static char dbg0_stack[PAGE_SIZE] __aligned(16);
677 CTASSERT(sizeof(struct nmi_pcpu) == 16);
679 struct amd64tss common_tss[MAXCPU];
682 * Software prototypes -- in more palatable form.
684 * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same
685 * slots as corresponding segments for i386 kernel.
687 struct soft_segment_descriptor gdt_segs[] = {
688 /* GNULL_SEL 0 Null Descriptor */
697 /* GNULL2_SEL 1 Null Descriptor */
706 /* GUFS32_SEL 2 32 bit %gs Descriptor for user */
708 .ssd_limit = 0xfffff,
709 .ssd_type = SDT_MEMRWA,
715 /* GUGS32_SEL 3 32 bit %fs Descriptor for user */
717 .ssd_limit = 0xfffff,
718 .ssd_type = SDT_MEMRWA,
724 /* GCODE_SEL 4 Code Descriptor for kernel */
726 .ssd_limit = 0xfffff,
727 .ssd_type = SDT_MEMERA,
733 /* GDATA_SEL 5 Data Descriptor for kernel */
735 .ssd_limit = 0xfffff,
736 .ssd_type = SDT_MEMRWA,
742 /* GUCODE32_SEL 6 32 bit Code Descriptor for user */
744 .ssd_limit = 0xfffff,
745 .ssd_type = SDT_MEMERA,
751 /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */
753 .ssd_limit = 0xfffff,
754 .ssd_type = SDT_MEMRWA,
760 /* GUCODE_SEL 8 64 bit Code Descriptor for user */
762 .ssd_limit = 0xfffff,
763 .ssd_type = SDT_MEMERA,
769 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
771 .ssd_limit = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE - 1,
772 .ssd_type = SDT_SYSTSS,
778 /* Actually, the TSS is a system descriptor which is double size */
787 /* GUSERLDT_SEL 11 LDT Descriptor */
796 /* GUSERLDT_SEL 12 LDT Descriptor, double size */
808 setidt(int idx, inthand_t *func, int typ, int dpl, int ist)
810 struct gate_descriptor *ip;
813 ip->gd_looffset = (uintptr_t)func;
814 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
820 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
824 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
825 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
826 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
827 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
828 IDTVEC(xmm), IDTVEC(dblfault),
829 IDTVEC(div_pti), IDTVEC(bpt_pti),
830 IDTVEC(ofl_pti), IDTVEC(bnd_pti), IDTVEC(ill_pti), IDTVEC(dna_pti),
831 IDTVEC(fpusegm_pti), IDTVEC(tss_pti), IDTVEC(missing_pti),
832 IDTVEC(stk_pti), IDTVEC(prot_pti), IDTVEC(page_pti),
833 IDTVEC(rsvd_pti), IDTVEC(fpu_pti), IDTVEC(align_pti),
836 IDTVEC(dtrace_ret), IDTVEC(dtrace_ret_pti),
839 IDTVEC(xen_intr_upcall), IDTVEC(xen_intr_upcall_pti),
841 IDTVEC(fast_syscall), IDTVEC(fast_syscall32),
842 IDTVEC(fast_syscall_pti);
846 * Display the index and function name of any IDT entries that don't use
847 * the default 'rsvd' entry point.
849 DB_SHOW_COMMAND(idt, db_show_idt)
851 struct gate_descriptor *ip;
856 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
857 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
858 if (func != (uintptr_t)&IDTVEC(rsvd)) {
859 db_printf("%3d\t", idx);
860 db_printsym(func, DB_STGY_PROC);
867 /* Show privileged registers. */
868 DB_SHOW_COMMAND(sysregs, db_show_sysregs)
873 } __packed idtr, gdtr;
876 __asm __volatile("sidt %0" : "=m" (idtr));
877 db_printf("idtr\t0x%016lx/%04x\n",
878 (u_long)idtr.base, (u_int)idtr.limit);
879 __asm __volatile("sgdt %0" : "=m" (gdtr));
880 db_printf("gdtr\t0x%016lx/%04x\n",
881 (u_long)gdtr.base, (u_int)gdtr.limit);
882 __asm __volatile("sldt %0" : "=r" (ldt));
883 db_printf("ldtr\t0x%04x\n", ldt);
884 __asm __volatile("str %0" : "=r" (tr));
885 db_printf("tr\t0x%04x\n", tr);
886 db_printf("cr0\t0x%016lx\n", rcr0());
887 db_printf("cr2\t0x%016lx\n", rcr2());
888 db_printf("cr3\t0x%016lx\n", rcr3());
889 db_printf("cr4\t0x%016lx\n", rcr4());
890 if (rcr4() & CR4_XSAVE)
891 db_printf("xcr0\t0x%016lx\n", rxcr(0));
892 db_printf("EFER\t0x%016lx\n", rdmsr(MSR_EFER));
893 if (cpu_feature2 & (CPUID2_VMX | CPUID2_SMX))
894 db_printf("FEATURES_CTL\t%016lx\n",
895 rdmsr(MSR_IA32_FEATURE_CONTROL));
896 db_printf("DEBUG_CTL\t0x%016lx\n", rdmsr(MSR_DEBUGCTLMSR));
897 db_printf("PAT\t0x%016lx\n", rdmsr(MSR_PAT));
898 db_printf("GSBASE\t0x%016lx\n", rdmsr(MSR_GSBASE));
901 DB_SHOW_COMMAND(dbregs, db_show_dbregs)
904 db_printf("dr0\t0x%016lx\n", rdr0());
905 db_printf("dr1\t0x%016lx\n", rdr1());
906 db_printf("dr2\t0x%016lx\n", rdr2());
907 db_printf("dr3\t0x%016lx\n", rdr3());
908 db_printf("dr6\t0x%016lx\n", rdr6());
909 db_printf("dr7\t0x%016lx\n", rdr7());
915 struct user_segment_descriptor *sd;
916 struct soft_segment_descriptor *ssd;
919 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
920 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
921 ssd->ssd_type = sd->sd_type;
922 ssd->ssd_dpl = sd->sd_dpl;
923 ssd->ssd_p = sd->sd_p;
924 ssd->ssd_long = sd->sd_long;
925 ssd->ssd_def32 = sd->sd_def32;
926 ssd->ssd_gran = sd->sd_gran;
931 struct soft_segment_descriptor *ssd;
932 struct user_segment_descriptor *sd;
935 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
936 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
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_long = ssd->ssd_long;
943 sd->sd_def32 = ssd->ssd_def32;
944 sd->sd_gran = ssd->ssd_gran;
949 struct soft_segment_descriptor *ssd;
950 struct system_segment_descriptor *sd;
953 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
954 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
955 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
956 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
957 sd->sd_type = ssd->ssd_type;
958 sd->sd_dpl = ssd->ssd_dpl;
959 sd->sd_p = ssd->ssd_p;
960 sd->sd_gran = ssd->ssd_gran;
963 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
964 #include <isa/isavar.h>
965 #include <isa/isareg.h>
967 * Return a bitmap of the current interrupt requests. This is 8259-specific
968 * and is only suitable for use at probe time.
969 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
970 * It shouldn't be here. There should probably be an APIC centric
971 * implementation in the apic driver code, if at all.
974 isa_irq_pending(void)
981 return ((irr2 << 8) | irr1);
988 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
991 int i, insert_idx, physmap_idx;
993 physmap_idx = *physmap_idxp;
999 * Find insertion point while checking for overlap. Start off by
1000 * assuming the new entry will be added to the end.
1002 * NB: physmap_idx points to the next free slot.
1004 insert_idx = physmap_idx;
1005 for (i = 0; i <= physmap_idx; i += 2) {
1006 if (base < physmap[i + 1]) {
1007 if (base + length <= physmap[i]) {
1011 if (boothowto & RB_VERBOSE)
1013 "Overlapping memory regions, ignoring second region\n");
1018 /* See if we can prepend to the next entry. */
1019 if (insert_idx <= physmap_idx && base + length == physmap[insert_idx]) {
1020 physmap[insert_idx] = base;
1024 /* See if we can append to the previous entry. */
1025 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
1026 physmap[insert_idx - 1] += length;
1031 *physmap_idxp = physmap_idx;
1032 if (physmap_idx == PHYSMAP_SIZE) {
1034 "Too many segments in the physical address map, giving up\n");
1039 * Move the last 'N' entries down to make room for the new
1042 for (i = (physmap_idx - 2); i > insert_idx; i -= 2) {
1043 physmap[i] = physmap[i - 2];
1044 physmap[i + 1] = physmap[i - 1];
1047 /* Insert the new entry. */
1048 physmap[insert_idx] = base;
1049 physmap[insert_idx + 1] = base + length;
1054 bios_add_smap_entries(struct bios_smap *smapbase, u_int32_t smapsize,
1055 vm_paddr_t *physmap, int *physmap_idx)
1057 struct bios_smap *smap, *smapend;
1059 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1061 for (smap = smapbase; smap < smapend; smap++) {
1062 if (boothowto & RB_VERBOSE)
1063 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1064 smap->type, smap->base, smap->length);
1066 if (smap->type != SMAP_TYPE_MEMORY)
1069 if (!add_physmap_entry(smap->base, smap->length, physmap,
1076 add_efi_map_entries(struct efi_map_header *efihdr, vm_paddr_t *physmap,
1079 struct efi_md *map, *p;
1084 static const char *types[] = {
1090 "RuntimeServicesCode",
1091 "RuntimeServicesData",
1092 "ConventionalMemory",
1094 "ACPIReclaimMemory",
1097 "MemoryMappedIOPortSpace",
1103 * Memory map data provided by UEFI via the GetMemoryMap
1104 * Boot Services API.
1106 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
1107 map = (struct efi_md *)((uint8_t *)efihdr + efisz);
1109 if (efihdr->descriptor_size == 0)
1111 ndesc = efihdr->memory_size / efihdr->descriptor_size;
1113 if (boothowto & RB_VERBOSE)
1114 printf("%23s %12s %12s %8s %4s\n",
1115 "Type", "Physical", "Virtual", "#Pages", "Attr");
1117 for (i = 0, p = map; i < ndesc; i++,
1118 p = efi_next_descriptor(p, efihdr->descriptor_size)) {
1119 if (boothowto & RB_VERBOSE) {
1120 if (p->md_type < nitems(types))
1121 type = types[p->md_type];
1124 printf("%23s %012lx %12p %08lx ", type, p->md_phys,
1125 p->md_virt, p->md_pages);
1126 if (p->md_attr & EFI_MD_ATTR_UC)
1128 if (p->md_attr & EFI_MD_ATTR_WC)
1130 if (p->md_attr & EFI_MD_ATTR_WT)
1132 if (p->md_attr & EFI_MD_ATTR_WB)
1134 if (p->md_attr & EFI_MD_ATTR_UCE)
1136 if (p->md_attr & EFI_MD_ATTR_WP)
1138 if (p->md_attr & EFI_MD_ATTR_RP)
1140 if (p->md_attr & EFI_MD_ATTR_XP)
1142 if (p->md_attr & EFI_MD_ATTR_NV)
1144 if (p->md_attr & EFI_MD_ATTR_MORE_RELIABLE)
1145 printf("MORE_RELIABLE ");
1146 if (p->md_attr & EFI_MD_ATTR_RO)
1148 if (p->md_attr & EFI_MD_ATTR_RT)
1153 switch (p->md_type) {
1154 case EFI_MD_TYPE_CODE:
1155 case EFI_MD_TYPE_DATA:
1156 case EFI_MD_TYPE_BS_CODE:
1157 case EFI_MD_TYPE_BS_DATA:
1158 case EFI_MD_TYPE_FREE:
1160 * We're allowed to use any entry with these types.
1167 if (!add_physmap_entry(p->md_phys, (p->md_pages * PAGE_SIZE),
1168 physmap, physmap_idx))
1173 static char bootmethod[16] = "";
1174 SYSCTL_STRING(_machdep, OID_AUTO, bootmethod, CTLFLAG_RD, bootmethod, 0,
1175 "System firmware boot method");
1178 native_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx)
1180 struct bios_smap *smap;
1181 struct efi_map_header *efihdr;
1185 * Memory map from INT 15:E820.
1187 * subr_module.c says:
1188 * "Consumer may safely assume that size value precedes data."
1189 * ie: an int32_t immediately precedes smap.
1192 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1193 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1194 smap = (struct bios_smap *)preload_search_info(kmdp,
1195 MODINFO_METADATA | MODINFOMD_SMAP);
1196 if (efihdr == NULL && smap == NULL)
1197 panic("No BIOS smap or EFI map info from loader!");
1199 if (efihdr != NULL) {
1200 add_efi_map_entries(efihdr, physmap, physmap_idx);
1201 strlcpy(bootmethod, "UEFI", sizeof(bootmethod));
1203 size = *((u_int32_t *)smap - 1);
1204 bios_add_smap_entries(smap, size, physmap, physmap_idx);
1205 strlcpy(bootmethod, "BIOS", sizeof(bootmethod));
1209 #define PAGES_PER_GB (1024 * 1024 * 1024 / PAGE_SIZE)
1212 * Populate the (physmap) array with base/bound pairs describing the
1213 * available physical memory in the system, then test this memory and
1214 * build the phys_avail array describing the actually-available memory.
1216 * Total memory size may be set by the kernel environment variable
1217 * hw.physmem or the compile-time define MAXMEM.
1219 * XXX first should be vm_paddr_t.
1222 getmemsize(caddr_t kmdp, u_int64_t first)
1224 int i, physmap_idx, pa_indx, da_indx;
1225 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1226 u_long physmem_start, physmem_tunable, memtest;
1228 quad_t dcons_addr, dcons_size;
1232 * Tell the physical memory allocator about pages used to store
1233 * the kernel and preloaded data. See kmem_bootstrap_free().
1235 vm_phys_add_seg((vm_paddr_t)kernphys, trunc_page(first));
1237 bzero(physmap, sizeof(physmap));
1240 init_ops.parse_memmap(kmdp, physmap, &physmap_idx);
1244 * Find the 'base memory' segment for SMP
1247 for (i = 0; i <= physmap_idx; i += 2) {
1248 if (physmap[i] <= 0xA0000) {
1249 basemem = physmap[i + 1] / 1024;
1253 if (basemem == 0 || basemem > 640) {
1256 "Memory map doesn't contain a basemem segment, faking it");
1261 * Maxmem isn't the "maximum memory", it's one larger than the
1262 * highest page of the physical address space. It should be
1263 * called something like "Maxphyspage". We may adjust this
1264 * based on ``hw.physmem'' and the results of the memory test.
1266 Maxmem = atop(physmap[physmap_idx + 1]);
1269 Maxmem = MAXMEM / 4;
1272 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1273 Maxmem = atop(physmem_tunable);
1276 * The boot memory test is disabled by default, as it takes a
1277 * significant amount of time on large-memory systems, and is
1278 * unfriendly to virtual machines as it unnecessarily touches all
1281 * A general name is used as the code may be extended to support
1282 * additional tests beyond the current "page present" test.
1285 TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
1288 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1291 if (Maxmem > atop(physmap[physmap_idx + 1]))
1292 Maxmem = atop(physmap[physmap_idx + 1]);
1294 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1295 (boothowto & RB_VERBOSE))
1296 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1299 * Make hole for "AP -> long mode" bootstrap code. The
1300 * mp_bootaddress vector is only available when the kernel
1301 * is configured to support APs and APs for the system start
1302 * in real mode mode (e.g. SMP bare metal).
1304 if (init_ops.mp_bootaddress)
1305 init_ops.mp_bootaddress(physmap, &physmap_idx);
1307 /* call pmap initialization to make new kernel address space */
1308 pmap_bootstrap(&first);
1311 * Size up each available chunk of physical memory.
1313 * XXX Some BIOSes corrupt low 64KB between suspend and resume.
1314 * By default, mask off the first 16 pages unless we appear to be
1317 physmem_start = (vm_guest > VM_GUEST_NO ? 1 : 16) << PAGE_SHIFT;
1318 TUNABLE_ULONG_FETCH("hw.physmem.start", &physmem_start);
1319 if (physmap[0] < physmem_start) {
1320 if (physmem_start < PAGE_SIZE)
1321 physmap[0] = PAGE_SIZE;
1322 else if (physmem_start >= physmap[1])
1323 physmap[0] = round_page(physmap[1] - PAGE_SIZE);
1325 physmap[0] = round_page(physmem_start);
1329 phys_avail[pa_indx++] = physmap[0];
1330 phys_avail[pa_indx] = physmap[0];
1331 dump_avail[da_indx] = physmap[0];
1335 * Get dcons buffer address
1337 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1338 getenv_quad("dcons.size", &dcons_size) == 0)
1342 * physmap is in bytes, so when converting to page boundaries,
1343 * round up the start address and round down the end address.
1347 printf("Testing system memory");
1348 for (i = 0; i <= physmap_idx; i += 2) {
1351 end = ptoa((vm_paddr_t)Maxmem);
1352 if (physmap[i + 1] < end)
1353 end = trunc_page(physmap[i + 1]);
1354 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1355 int tmp, page_bad, full;
1356 int *ptr = (int *)CADDR1;
1360 * block out kernel memory as not available.
1362 if (pa >= (vm_paddr_t)kernphys && pa < first)
1366 * block out dcons buffer
1369 && pa >= trunc_page(dcons_addr)
1370 && pa < dcons_addr + dcons_size)
1378 * Print a "." every GB to show we're making
1382 if ((page_counter % PAGES_PER_GB) == 0)
1386 * map page into kernel: valid, read/write,non-cacheable
1388 *pte = pa | PG_V | PG_RW | PG_NC_PWT | PG_NC_PCD;
1393 * Test for alternating 1's and 0's
1395 *(volatile int *)ptr = 0xaaaaaaaa;
1396 if (*(volatile int *)ptr != 0xaaaaaaaa)
1399 * Test for alternating 0's and 1's
1401 *(volatile int *)ptr = 0x55555555;
1402 if (*(volatile int *)ptr != 0x55555555)
1407 *(volatile int *)ptr = 0xffffffff;
1408 if (*(volatile int *)ptr != 0xffffffff)
1413 *(volatile int *)ptr = 0x0;
1414 if (*(volatile int *)ptr != 0x0)
1417 * Restore original value.
1423 * Adjust array of valid/good pages.
1425 if (page_bad == TRUE)
1428 * If this good page is a continuation of the
1429 * previous set of good pages, then just increase
1430 * the end pointer. Otherwise start a new chunk.
1431 * Note that "end" points one higher than end,
1432 * making the range >= start and < end.
1433 * If we're also doing a speculative memory
1434 * test and we at or past the end, bump up Maxmem
1435 * so that we keep going. The first bad page
1436 * will terminate the loop.
1438 if (phys_avail[pa_indx] == pa) {
1439 phys_avail[pa_indx] += PAGE_SIZE;
1442 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1444 "Too many holes in the physical address space, giving up\n");
1449 phys_avail[pa_indx++] = pa; /* start */
1450 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1454 if (dump_avail[da_indx] == pa) {
1455 dump_avail[da_indx] += PAGE_SIZE;
1458 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1462 dump_avail[da_indx++] = pa; /* start */
1463 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1477 * The last chunk must contain at least one page plus the message
1478 * buffer to avoid complicating other code (message buffer address
1479 * calculation, etc.).
1481 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1482 round_page(msgbufsize) >= phys_avail[pa_indx]) {
1483 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1484 phys_avail[pa_indx--] = 0;
1485 phys_avail[pa_indx--] = 0;
1488 Maxmem = atop(phys_avail[pa_indx]);
1490 /* Trim off space for the message buffer. */
1491 phys_avail[pa_indx] -= round_page(msgbufsize);
1493 /* Map the message buffer. */
1494 msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
1498 native_parse_preload_data(u_int64_t modulep)
1503 vm_offset_t ksym_start;
1504 vm_offset_t ksym_end;
1507 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1508 preload_bootstrap_relocate(KERNBASE);
1509 kmdp = preload_search_by_type("elf kernel");
1511 kmdp = preload_search_by_type("elf64 kernel");
1512 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1513 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
1516 init_static_kenv(envp, 0);
1518 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1519 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1520 db_fetch_ksymtab(ksym_start, ksym_end);
1522 efi_systbl_phys = MD_FETCH(kmdp, MODINFOMD_FW_HANDLE, vm_paddr_t);
1528 amd64_kdb_init(void)
1532 if (boothowto & RB_KDB)
1533 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
1537 /* Set up the fast syscall stuff */
1539 amd64_conf_fast_syscall(void)
1543 msr = rdmsr(MSR_EFER) | EFER_SCE;
1544 wrmsr(MSR_EFER, msr);
1545 wrmsr(MSR_LSTAR, pti ? (u_int64_t)IDTVEC(fast_syscall_pti) :
1546 (u_int64_t)IDTVEC(fast_syscall));
1547 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1548 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1549 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1550 wrmsr(MSR_STAR, msr);
1551 wrmsr(MSR_SF_MASK, PSL_NT | PSL_T | PSL_I | PSL_C | PSL_D | PSL_AC);
1555 hammer_time(u_int64_t modulep, u_int64_t physfree)
1560 struct nmi_pcpu *np;
1561 struct xstate_hdr *xhdr;
1567 TSRAW(&thread0, TS_ENTER, __func__, NULL);
1569 kmdp = init_ops.parse_preload_data(modulep);
1572 identify_hypervisor();
1574 * hw.cpu_stdext_disable is ignored by the call, it will be
1575 * re-evaluted by the below call to finishidentcpu().
1579 link_elf_ireloc(kmdp);
1582 * This may be done better later if it gets more high level
1583 * components in it. If so just link td->td_proc here.
1585 proc_linkup0(&proc0, &thread0);
1587 /* Init basic tunables, hz etc */
1590 thread0.td_kstack = physfree + KERNBASE;
1591 thread0.td_kstack_pages = kstack_pages;
1592 kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
1593 bzero((void *)thread0.td_kstack, kstack0_sz);
1594 physfree += kstack0_sz;
1597 * make gdt memory segments
1599 for (x = 0; x < NGDT; x++) {
1600 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1601 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1602 ssdtosd(&gdt_segs[x], &gdt[x]);
1604 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1605 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1606 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1608 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1609 r_gdt.rd_base = (long) gdt;
1613 wrmsr(MSR_FSBASE, 0); /* User value */
1614 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1615 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1617 pcpu_init(pc, 0, sizeof(struct pcpu));
1618 dpcpu_init((void *)(physfree + KERNBASE), 0);
1619 physfree += DPCPU_SIZE;
1620 PCPU_SET(prvspace, pc);
1621 PCPU_SET(curthread, &thread0);
1622 /* Non-late cninit() and printf() can be moved up to here. */
1623 PCPU_SET(tssp, &common_tss[0]);
1624 PCPU_SET(commontssp, &common_tss[0]);
1625 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1626 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1627 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1628 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1631 * Initialize mutexes.
1633 * icu_lock: in order to allow an interrupt to occur in a critical
1634 * section, to set pcpu->ipending (etc...) properly, we
1635 * must be able to get the icu lock, so it can't be
1639 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1640 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1643 pti = pti_get_default();
1644 TUNABLE_INT_FETCH("vm.pmap.pti", &pti);
1646 for (x = 0; x < NIDT; x++)
1647 setidt(x, pti ? &IDTVEC(rsvd_pti) : &IDTVEC(rsvd), SDT_SYSIGT,
1649 setidt(IDT_DE, pti ? &IDTVEC(div_pti) : &IDTVEC(div), SDT_SYSIGT,
1651 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 4);
1652 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1653 setidt(IDT_BP, pti ? &IDTVEC(bpt_pti) : &IDTVEC(bpt), SDT_SYSIGT,
1655 setidt(IDT_OF, pti ? &IDTVEC(ofl_pti) : &IDTVEC(ofl), SDT_SYSIGT,
1657 setidt(IDT_BR, pti ? &IDTVEC(bnd_pti) : &IDTVEC(bnd), SDT_SYSIGT,
1659 setidt(IDT_UD, pti ? &IDTVEC(ill_pti) : &IDTVEC(ill), SDT_SYSIGT,
1661 setidt(IDT_NM, pti ? &IDTVEC(dna_pti) : &IDTVEC(dna), SDT_SYSIGT,
1663 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1664 setidt(IDT_FPUGP, pti ? &IDTVEC(fpusegm_pti) : &IDTVEC(fpusegm),
1665 SDT_SYSIGT, SEL_KPL, 0);
1666 setidt(IDT_TS, pti ? &IDTVEC(tss_pti) : &IDTVEC(tss), SDT_SYSIGT,
1668 setidt(IDT_NP, pti ? &IDTVEC(missing_pti) : &IDTVEC(missing),
1669 SDT_SYSIGT, SEL_KPL, 0);
1670 setidt(IDT_SS, pti ? &IDTVEC(stk_pti) : &IDTVEC(stk), SDT_SYSIGT,
1672 setidt(IDT_GP, pti ? &IDTVEC(prot_pti) : &IDTVEC(prot), SDT_SYSIGT,
1674 setidt(IDT_PF, pti ? &IDTVEC(page_pti) : &IDTVEC(page), SDT_SYSIGT,
1676 setidt(IDT_MF, pti ? &IDTVEC(fpu_pti) : &IDTVEC(fpu), SDT_SYSIGT,
1678 setidt(IDT_AC, pti ? &IDTVEC(align_pti) : &IDTVEC(align), SDT_SYSIGT,
1680 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 3);
1681 setidt(IDT_XF, pti ? &IDTVEC(xmm_pti) : &IDTVEC(xmm), SDT_SYSIGT,
1683 #ifdef KDTRACE_HOOKS
1684 setidt(IDT_DTRACE_RET, pti ? &IDTVEC(dtrace_ret_pti) :
1685 &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
1688 setidt(IDT_EVTCHN, pti ? &IDTVEC(xen_intr_upcall_pti) :
1689 &IDTVEC(xen_intr_upcall), SDT_SYSIGT, SEL_KPL, 0);
1691 r_idt.rd_limit = sizeof(idt0) - 1;
1692 r_idt.rd_base = (long) idt;
1696 * Initialize the clock before the console so that console
1697 * initialization can use DELAY().
1702 * Use vt(4) by default for UEFI boot (during the sc(4)/vt(4)
1704 * Once bootblocks have updated, we can test directly for
1705 * efi_systbl != NULL here...
1707 if (preload_search_info(kmdp, MODINFO_METADATA | MODINFOMD_EFI_MAP)
1709 vty_set_preferred(VTY_VT);
1711 finishidentcpu(); /* Final stage of CPU initialization */
1712 initializecpu(); /* Initialize CPU registers */
1713 initializecpucache();
1715 /* doublefault stack space, runs on ist1 */
1716 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1719 * NMI stack, runs on ist2. The pcpu pointer is stored just
1720 * above the start of the ist2 stack.
1722 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1723 np->np_pcpu = (register_t) pc;
1724 common_tss[0].tss_ist2 = (long) np;
1727 * MC# stack, runs on ist3. The pcpu pointer is stored just
1728 * above the start of the ist3 stack.
1730 np = ((struct nmi_pcpu *) &mce0_stack[sizeof(mce0_stack)]) - 1;
1731 np->np_pcpu = (register_t) pc;
1732 common_tss[0].tss_ist3 = (long) np;
1735 * DB# stack, runs on ist4.
1737 np = ((struct nmi_pcpu *) &dbg0_stack[sizeof(dbg0_stack)]) - 1;
1738 np->np_pcpu = (register_t) pc;
1739 common_tss[0].tss_ist4 = (long) np;
1741 /* Set the IO permission bitmap (empty due to tss seg limit) */
1742 common_tss[0].tss_iobase = sizeof(struct amd64tss) + IOPERM_BITMAP_SIZE;
1744 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1747 amd64_conf_fast_syscall();
1750 * Temporary forge some valid pointer to PCB, for exception
1751 * handlers. It is reinitialized properly below after FPU is
1752 * set up. Also set up td_critnest to short-cut the page
1755 cpu_max_ext_state_size = sizeof(struct savefpu);
1756 thread0.td_pcb = get_pcb_td(&thread0);
1757 thread0.td_critnest = 1;
1760 * The console and kdb should be initialized even earlier than here,
1761 * but some console drivers don't work until after getmemsize().
1762 * Default to late console initialization to support these drivers.
1763 * This loses mainly printf()s in getmemsize() and early debugging.
1766 TUNABLE_INT_FETCH("debug.late_console", &late_console);
1767 if (!late_console) {
1772 getmemsize(kmdp, physfree);
1773 init_param2(physmem);
1775 /* now running on new page tables, configured,and u/iom is accessible */
1785 /* Reset and mask the atpics and leave them shut down. */
1789 * Point the ICU spurious interrupt vectors at the APIC spurious
1790 * interrupt handler.
1792 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1793 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1796 #error "have you forgotten the isa device?";
1802 msgbufinit(msgbufp, msgbufsize);
1806 * Set up thread0 pcb after fpuinit calculated pcb + fpu save
1807 * area size. Zero out the extended state header in fpu save
1810 thread0.td_pcb = get_pcb_td(&thread0);
1811 thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
1812 bzero(get_pcb_user_save_td(&thread0), cpu_max_ext_state_size);
1814 xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
1816 xhdr->xstate_bv = xsave_mask;
1818 /* make an initial tss so cpu can get interrupt stack on syscall! */
1819 rsp0 = (vm_offset_t)thread0.td_pcb;
1820 /* Ensure the stack is aligned to 16 bytes */
1822 common_tss[0].tss_rsp0 = rsp0;
1823 PCPU_SET(rsp0, rsp0);
1824 PCPU_SET(pti_rsp0, ((vm_offset_t)PCPU_PTR(pti_stack) +
1825 PC_PTI_STACK_SZ * sizeof(uint64_t)) & ~0xful);
1826 PCPU_SET(curpcb, thread0.td_pcb);
1828 /* transfer to user mode */
1830 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1831 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1832 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1833 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
1834 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
1840 /* setup proc 0's pcb */
1841 thread0.td_pcb->pcb_flags = 0;
1842 thread0.td_frame = &proc0_tf;
1844 env = kern_getenv("kernelname");
1846 strlcpy(kernelname, env, sizeof(kernelname));
1853 thread0.td_critnest = 0;
1855 TUNABLE_INT_FETCH("hw.ibrs_disable", &hw_ibrs_disable);
1856 TUNABLE_INT_FETCH("hw.spec_store_bypass_disable", &hw_ssb_disable);
1860 /* Location of kernel stack for locore */
1861 return ((u_int64_t)thread0.td_pcb);
1865 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1868 pcpu->pc_acpi_id = 0xffffffff;
1872 smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
1874 struct bios_smap *smapbase;
1875 struct bios_smap_xattr smap;
1878 int count, error, i;
1880 /* Retrieve the system memory map from the loader. */
1881 kmdp = preload_search_by_type("elf kernel");
1883 kmdp = preload_search_by_type("elf64 kernel");
1884 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1885 MODINFO_METADATA | MODINFOMD_SMAP);
1886 if (smapbase == NULL)
1888 smapattr = (uint32_t *)preload_search_info(kmdp,
1889 MODINFO_METADATA | MODINFOMD_SMAP_XATTR);
1890 count = *((uint32_t *)smapbase - 1) / sizeof(*smapbase);
1892 for (i = 0; i < count; i++) {
1893 smap.base = smapbase[i].base;
1894 smap.length = smapbase[i].length;
1895 smap.type = smapbase[i].type;
1896 if (smapattr != NULL)
1897 smap.xattr = smapattr[i];
1900 error = SYSCTL_OUT(req, &smap, sizeof(smap));
1904 SYSCTL_PROC(_machdep, OID_AUTO, smap, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
1905 smap_sysctl_handler, "S,bios_smap_xattr", "Raw BIOS SMAP data");
1908 efi_map_sysctl_handler(SYSCTL_HANDLER_ARGS)
1910 struct efi_map_header *efihdr;
1914 kmdp = preload_search_by_type("elf kernel");
1916 kmdp = preload_search_by_type("elf64 kernel");
1917 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1918 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1921 efisize = *((uint32_t *)efihdr - 1);
1922 return (SYSCTL_OUT(req, efihdr, efisize));
1924 SYSCTL_PROC(_machdep, OID_AUTO, efi_map, CTLTYPE_OPAQUE|CTLFLAG_RD, NULL, 0,
1925 efi_map_sysctl_handler, "S,efi_map_header", "Raw EFI Memory Map");
1928 spinlock_enter(void)
1934 if (td->td_md.md_spinlock_count == 0) {
1935 flags = intr_disable();
1936 td->td_md.md_spinlock_count = 1;
1937 td->td_md.md_saved_flags = flags;
1940 td->td_md.md_spinlock_count++;
1950 flags = td->td_md.md_saved_flags;
1951 td->td_md.md_spinlock_count--;
1952 if (td->td_md.md_spinlock_count == 0) {
1954 intr_restore(flags);
1959 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1960 * we want to start a backtrace from the function that caused us to enter
1961 * the debugger. We have the context in the trapframe, but base the trace
1962 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1963 * enough for a backtrace.
1966 makectx(struct trapframe *tf, struct pcb *pcb)
1969 pcb->pcb_r12 = tf->tf_r12;
1970 pcb->pcb_r13 = tf->tf_r13;
1971 pcb->pcb_r14 = tf->tf_r14;
1972 pcb->pcb_r15 = tf->tf_r15;
1973 pcb->pcb_rbp = tf->tf_rbp;
1974 pcb->pcb_rbx = tf->tf_rbx;
1975 pcb->pcb_rip = tf->tf_rip;
1976 pcb->pcb_rsp = tf->tf_rsp;
1980 ptrace_set_pc(struct thread *td, unsigned long addr)
1983 td->td_frame->tf_rip = addr;
1984 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
1989 ptrace_single_step(struct thread *td)
1992 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
1993 if ((td->td_frame->tf_rflags & PSL_T) == 0) {
1994 td->td_frame->tf_rflags |= PSL_T;
1995 td->td_dbgflags |= TDB_STEP;
2001 ptrace_clear_single_step(struct thread *td)
2004 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
2005 td->td_frame->tf_rflags &= ~PSL_T;
2006 td->td_dbgflags &= ~TDB_STEP;
2011 fill_regs(struct thread *td, struct reg *regs)
2013 struct trapframe *tp;
2016 return (fill_frame_regs(tp, regs));
2020 fill_frame_regs(struct trapframe *tp, struct reg *regs)
2022 regs->r_r15 = tp->tf_r15;
2023 regs->r_r14 = tp->tf_r14;
2024 regs->r_r13 = tp->tf_r13;
2025 regs->r_r12 = tp->tf_r12;
2026 regs->r_r11 = tp->tf_r11;
2027 regs->r_r10 = tp->tf_r10;
2028 regs->r_r9 = tp->tf_r9;
2029 regs->r_r8 = tp->tf_r8;
2030 regs->r_rdi = tp->tf_rdi;
2031 regs->r_rsi = tp->tf_rsi;
2032 regs->r_rbp = tp->tf_rbp;
2033 regs->r_rbx = tp->tf_rbx;
2034 regs->r_rdx = tp->tf_rdx;
2035 regs->r_rcx = tp->tf_rcx;
2036 regs->r_rax = tp->tf_rax;
2037 regs->r_rip = tp->tf_rip;
2038 regs->r_cs = tp->tf_cs;
2039 regs->r_rflags = tp->tf_rflags;
2040 regs->r_rsp = tp->tf_rsp;
2041 regs->r_ss = tp->tf_ss;
2042 if (tp->tf_flags & TF_HASSEGS) {
2043 regs->r_ds = tp->tf_ds;
2044 regs->r_es = tp->tf_es;
2045 regs->r_fs = tp->tf_fs;
2046 regs->r_gs = tp->tf_gs;
2057 set_regs(struct thread *td, struct reg *regs)
2059 struct trapframe *tp;
2063 rflags = regs->r_rflags & 0xffffffff;
2064 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
2066 tp->tf_r15 = regs->r_r15;
2067 tp->tf_r14 = regs->r_r14;
2068 tp->tf_r13 = regs->r_r13;
2069 tp->tf_r12 = regs->r_r12;
2070 tp->tf_r11 = regs->r_r11;
2071 tp->tf_r10 = regs->r_r10;
2072 tp->tf_r9 = regs->r_r9;
2073 tp->tf_r8 = regs->r_r8;
2074 tp->tf_rdi = regs->r_rdi;
2075 tp->tf_rsi = regs->r_rsi;
2076 tp->tf_rbp = regs->r_rbp;
2077 tp->tf_rbx = regs->r_rbx;
2078 tp->tf_rdx = regs->r_rdx;
2079 tp->tf_rcx = regs->r_rcx;
2080 tp->tf_rax = regs->r_rax;
2081 tp->tf_rip = regs->r_rip;
2082 tp->tf_cs = regs->r_cs;
2083 tp->tf_rflags = rflags;
2084 tp->tf_rsp = regs->r_rsp;
2085 tp->tf_ss = regs->r_ss;
2086 if (0) { /* XXXKIB */
2087 tp->tf_ds = regs->r_ds;
2088 tp->tf_es = regs->r_es;
2089 tp->tf_fs = regs->r_fs;
2090 tp->tf_gs = regs->r_gs;
2091 tp->tf_flags = TF_HASSEGS;
2093 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
2097 /* XXX check all this stuff! */
2098 /* externalize from sv_xmm */
2100 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
2102 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2103 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2107 bzero(fpregs, sizeof(*fpregs));
2109 /* FPU control/status */
2110 penv_fpreg->en_cw = penv_xmm->en_cw;
2111 penv_fpreg->en_sw = penv_xmm->en_sw;
2112 penv_fpreg->en_tw = penv_xmm->en_tw;
2113 penv_fpreg->en_opcode = penv_xmm->en_opcode;
2114 penv_fpreg->en_rip = penv_xmm->en_rip;
2115 penv_fpreg->en_rdp = penv_xmm->en_rdp;
2116 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
2117 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
2120 for (i = 0; i < 8; ++i)
2121 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
2124 for (i = 0; i < 16; ++i)
2125 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
2128 /* internalize from fpregs into sv_xmm */
2130 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
2132 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2133 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
2137 /* FPU control/status */
2138 penv_xmm->en_cw = penv_fpreg->en_cw;
2139 penv_xmm->en_sw = penv_fpreg->en_sw;
2140 penv_xmm->en_tw = penv_fpreg->en_tw;
2141 penv_xmm->en_opcode = penv_fpreg->en_opcode;
2142 penv_xmm->en_rip = penv_fpreg->en_rip;
2143 penv_xmm->en_rdp = penv_fpreg->en_rdp;
2144 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
2145 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
2148 for (i = 0; i < 8; ++i)
2149 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
2152 for (i = 0; i < 16; ++i)
2153 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
2156 /* externalize from td->pcb */
2158 fill_fpregs(struct thread *td, struct fpreg *fpregs)
2161 KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
2162 P_SHOULDSTOP(td->td_proc),
2163 ("not suspended thread %p", td));
2165 fill_fpregs_xmm(get_pcb_user_save_td(td), fpregs);
2169 /* internalize to td->pcb */
2171 set_fpregs(struct thread *td, struct fpreg *fpregs)
2175 set_fpregs_xmm(fpregs, get_pcb_user_save_td(td));
2182 * Get machine context.
2185 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
2188 struct trapframe *tp;
2192 PROC_LOCK(curthread->td_proc);
2193 mcp->mc_onstack = sigonstack(tp->tf_rsp);
2194 PROC_UNLOCK(curthread->td_proc);
2195 mcp->mc_r15 = tp->tf_r15;
2196 mcp->mc_r14 = tp->tf_r14;
2197 mcp->mc_r13 = tp->tf_r13;
2198 mcp->mc_r12 = tp->tf_r12;
2199 mcp->mc_r11 = tp->tf_r11;
2200 mcp->mc_r10 = tp->tf_r10;
2201 mcp->mc_r9 = tp->tf_r9;
2202 mcp->mc_r8 = tp->tf_r8;
2203 mcp->mc_rdi = tp->tf_rdi;
2204 mcp->mc_rsi = tp->tf_rsi;
2205 mcp->mc_rbp = tp->tf_rbp;
2206 mcp->mc_rbx = tp->tf_rbx;
2207 mcp->mc_rcx = tp->tf_rcx;
2208 mcp->mc_rflags = tp->tf_rflags;
2209 if (flags & GET_MC_CLEAR_RET) {
2212 mcp->mc_rflags &= ~PSL_C;
2214 mcp->mc_rax = tp->tf_rax;
2215 mcp->mc_rdx = tp->tf_rdx;
2217 mcp->mc_rip = tp->tf_rip;
2218 mcp->mc_cs = tp->tf_cs;
2219 mcp->mc_rsp = tp->tf_rsp;
2220 mcp->mc_ss = tp->tf_ss;
2221 mcp->mc_ds = tp->tf_ds;
2222 mcp->mc_es = tp->tf_es;
2223 mcp->mc_fs = tp->tf_fs;
2224 mcp->mc_gs = tp->tf_gs;
2225 mcp->mc_flags = tp->tf_flags;
2226 mcp->mc_len = sizeof(*mcp);
2227 get_fpcontext(td, mcp, NULL, 0);
2228 update_pcb_bases(pcb);
2229 mcp->mc_fsbase = pcb->pcb_fsbase;
2230 mcp->mc_gsbase = pcb->pcb_gsbase;
2231 mcp->mc_xfpustate = 0;
2232 mcp->mc_xfpustate_len = 0;
2233 bzero(mcp->mc_spare, sizeof(mcp->mc_spare));
2238 * Set machine context.
2240 * However, we don't set any but the user modifiable flags, and we won't
2241 * touch the cs selector.
2244 set_mcontext(struct thread *td, mcontext_t *mcp)
2247 struct trapframe *tp;
2254 if (mcp->mc_len != sizeof(*mcp) ||
2255 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2257 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2258 (tp->tf_rflags & ~PSL_USERCHANGE);
2259 if (mcp->mc_flags & _MC_HASFPXSTATE) {
2260 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
2261 sizeof(struct savefpu))
2263 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
2264 ret = copyin((void *)mcp->mc_xfpustate, xfpustate,
2265 mcp->mc_xfpustate_len);
2270 ret = set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
2273 tp->tf_r15 = mcp->mc_r15;
2274 tp->tf_r14 = mcp->mc_r14;
2275 tp->tf_r13 = mcp->mc_r13;
2276 tp->tf_r12 = mcp->mc_r12;
2277 tp->tf_r11 = mcp->mc_r11;
2278 tp->tf_r10 = mcp->mc_r10;
2279 tp->tf_r9 = mcp->mc_r9;
2280 tp->tf_r8 = mcp->mc_r8;
2281 tp->tf_rdi = mcp->mc_rdi;
2282 tp->tf_rsi = mcp->mc_rsi;
2283 tp->tf_rbp = mcp->mc_rbp;
2284 tp->tf_rbx = mcp->mc_rbx;
2285 tp->tf_rdx = mcp->mc_rdx;
2286 tp->tf_rcx = mcp->mc_rcx;
2287 tp->tf_rax = mcp->mc_rax;
2288 tp->tf_rip = mcp->mc_rip;
2289 tp->tf_rflags = rflags;
2290 tp->tf_rsp = mcp->mc_rsp;
2291 tp->tf_ss = mcp->mc_ss;
2292 tp->tf_flags = mcp->mc_flags;
2293 if (tp->tf_flags & TF_HASSEGS) {
2294 tp->tf_ds = mcp->mc_ds;
2295 tp->tf_es = mcp->mc_es;
2296 tp->tf_fs = mcp->mc_fs;
2297 tp->tf_gs = mcp->mc_gs;
2299 set_pcb_flags(pcb, PCB_FULL_IRET);
2300 if (mcp->mc_flags & _MC_HASBASES) {
2301 pcb->pcb_fsbase = mcp->mc_fsbase;
2302 pcb->pcb_gsbase = mcp->mc_gsbase;
2308 get_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpusave,
2309 size_t xfpusave_len)
2311 size_t max_len, len;
2313 mcp->mc_ownedfp = fpugetregs(td);
2314 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
2315 sizeof(mcp->mc_fpstate));
2316 mcp->mc_fpformat = fpuformat();
2317 if (!use_xsave || xfpusave_len == 0)
2319 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
2321 if (len > max_len) {
2323 bzero(xfpusave + max_len, len - max_len);
2325 mcp->mc_flags |= _MC_HASFPXSTATE;
2326 mcp->mc_xfpustate_len = len;
2327 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
2331 set_fpcontext(struct thread *td, mcontext_t *mcp, char *xfpustate,
2332 size_t xfpustate_len)
2336 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2338 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2340 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
2341 /* We don't care what state is left in the FPU or PCB. */
2344 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2345 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2346 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate,
2347 xfpustate, xfpustate_len);
2354 fpstate_drop(struct thread *td)
2357 KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
2359 if (PCPU_GET(fpcurthread) == td)
2362 * XXX force a full drop of the fpu. The above only drops it if we
2365 * XXX I don't much like fpugetuserregs()'s semantics of doing a full
2366 * drop. Dropping only to the pcb matches fnsave's behaviour.
2367 * We only need to drop to !PCB_INITDONE in sendsig(). But
2368 * sendsig() is the only caller of fpugetuserregs()... perhaps we just
2369 * have too many layers.
2371 clear_pcb_flags(curthread->td_pcb,
2372 PCB_FPUINITDONE | PCB_USERFPUINITDONE);
2377 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2382 dbregs->dr[0] = rdr0();
2383 dbregs->dr[1] = rdr1();
2384 dbregs->dr[2] = rdr2();
2385 dbregs->dr[3] = rdr3();
2386 dbregs->dr[6] = rdr6();
2387 dbregs->dr[7] = rdr7();
2390 dbregs->dr[0] = pcb->pcb_dr0;
2391 dbregs->dr[1] = pcb->pcb_dr1;
2392 dbregs->dr[2] = pcb->pcb_dr2;
2393 dbregs->dr[3] = pcb->pcb_dr3;
2394 dbregs->dr[6] = pcb->pcb_dr6;
2395 dbregs->dr[7] = pcb->pcb_dr7;
2411 set_dbregs(struct thread *td, struct dbreg *dbregs)
2417 load_dr0(dbregs->dr[0]);
2418 load_dr1(dbregs->dr[1]);
2419 load_dr2(dbregs->dr[2]);
2420 load_dr3(dbregs->dr[3]);
2421 load_dr6(dbregs->dr[6]);
2422 load_dr7(dbregs->dr[7]);
2425 * Don't let an illegal value for dr7 get set. Specifically,
2426 * check for undefined settings. Setting these bit patterns
2427 * result in undefined behaviour and can lead to an unexpected
2428 * TRCTRAP or a general protection fault right here.
2429 * Upper bits of dr6 and dr7 must not be set
2431 for (i = 0; i < 4; i++) {
2432 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2434 if (td->td_frame->tf_cs == _ucode32sel &&
2435 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2438 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2439 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2445 * Don't let a process set a breakpoint that is not within the
2446 * process's address space. If a process could do this, it
2447 * could halt the system by setting a breakpoint in the kernel
2448 * (if ddb was enabled). Thus, we need to check to make sure
2449 * that no breakpoints are being enabled for addresses outside
2450 * process's address space.
2452 * XXX - what about when the watched area of the user's
2453 * address space is written into from within the kernel
2454 * ... wouldn't that still cause a breakpoint to be generated
2455 * from within kernel mode?
2458 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2459 /* dr0 is enabled */
2460 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2463 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2464 /* dr1 is enabled */
2465 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2468 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2469 /* dr2 is enabled */
2470 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2473 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2474 /* dr3 is enabled */
2475 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2479 pcb->pcb_dr0 = dbregs->dr[0];
2480 pcb->pcb_dr1 = dbregs->dr[1];
2481 pcb->pcb_dr2 = dbregs->dr[2];
2482 pcb->pcb_dr3 = dbregs->dr[3];
2483 pcb->pcb_dr6 = dbregs->dr[6];
2484 pcb->pcb_dr7 = dbregs->dr[7];
2486 set_pcb_flags(pcb, PCB_DBREGS);
2496 load_dr7(0); /* Turn off the control bits first */
2505 * Return > 0 if a hardware breakpoint has been hit, and the
2506 * breakpoint was in user space. Return 0, otherwise.
2509 user_dbreg_trap(register_t dr6)
2512 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2513 int nbp; /* number of breakpoints that triggered */
2514 caddr_t addr[4]; /* breakpoint addresses */
2517 bp = dr6 & DBREG_DR6_BMASK;
2520 * None of the breakpoint bits are set meaning this
2521 * trap was not caused by any of the debug registers
2527 if ((dr7 & 0x000000ff) == 0) {
2529 * all GE and LE bits in the dr7 register are zero,
2530 * thus the trap couldn't have been caused by the
2531 * hardware debug registers
2539 * at least one of the breakpoints were hit, check to see
2540 * which ones and if any of them are user space addresses
2544 addr[nbp++] = (caddr_t)rdr0();
2547 addr[nbp++] = (caddr_t)rdr1();
2550 addr[nbp++] = (caddr_t)rdr2();
2553 addr[nbp++] = (caddr_t)rdr3();
2556 for (i = 0; i < nbp; i++) {
2557 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2559 * addr[i] is in user space
2566 * None of the breakpoints are in user space.
2572 * The pcb_flags is only modified by current thread, or by other threads
2573 * when current thread is stopped. However, current thread may change it
2574 * from the interrupt context in cpu_switch(), or in the trap handler.
2575 * When we read-modify-write pcb_flags from C sources, compiler may generate
2576 * code that is not atomic regarding the interrupt handler. If a trap or
2577 * interrupt happens and any flag is modified from the handler, it can be
2578 * clobbered with the cached value later. Therefore, we implement setting
2579 * and clearing flags with single-instruction functions, which do not race
2580 * with possible modification of the flags from the trap or interrupt context,
2581 * because traps and interrupts are executed only on instruction boundary.
2584 set_pcb_flags_raw(struct pcb *pcb, const u_int flags)
2587 __asm __volatile("orl %1,%0"
2588 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags)
2594 * The support for RDFSBASE, WRFSBASE and similar instructions for %gs
2595 * base requires that kernel saves MSR_FSBASE and MSR_{K,}GSBASE into
2596 * pcb if user space modified the bases. We must save on the context
2597 * switch or if the return to usermode happens through the doreti.
2599 * Tracking of both events is performed by the pcb flag PCB_FULL_IRET,
2600 * which have a consequence that the base MSRs must be saved each time
2601 * the PCB_FULL_IRET flag is set. We disable interrupts to sync with
2605 set_pcb_flags(struct pcb *pcb, const u_int flags)
2609 if (curpcb == pcb &&
2610 (flags & PCB_FULL_IRET) != 0 &&
2611 (pcb->pcb_flags & PCB_FULL_IRET) == 0 &&
2612 (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0) {
2614 if ((pcb->pcb_flags & PCB_FULL_IRET) == 0) {
2615 if (rfs() == _ufssel)
2616 pcb->pcb_fsbase = rdfsbase();
2617 if (rgs() == _ugssel)
2618 pcb->pcb_gsbase = rdmsr(MSR_KGSBASE);
2620 set_pcb_flags_raw(pcb, flags);
2623 set_pcb_flags_raw(pcb, flags);
2628 clear_pcb_flags(struct pcb *pcb, const u_int flags)
2631 __asm __volatile("andl %1,%0"
2632 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags)
2639 * Provide inb() and outb() as functions. They are normally only available as
2640 * inline functions, thus cannot be called from the debugger.
2643 /* silence compiler warnings */
2644 u_char inb_(u_short);
2645 void outb_(u_short, u_char);
2654 outb_(u_short port, u_char data)