2 * Copyright (c) 2003 Peter Wemm.
3 * Copyright (c) 1992 Terrence R. Lambert.
4 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include "opt_atalk.h"
45 #include "opt_atpic.h"
46 #include "opt_compat.h"
52 #include "opt_kstack_pages.h"
53 #include "opt_maxmem.h"
54 #include "opt_msgbuf.h"
55 #include "opt_perfmon.h"
57 #include <sys/param.h>
59 #include <sys/systm.h>
63 #include <sys/callout.h>
64 #include <sys/clock.h>
67 #include <sys/eventhandler.h>
69 #include <sys/imgact.h>
71 #include <sys/kernel.h>
73 #include <sys/linker.h>
75 #include <sys/malloc.h>
76 #include <sys/memrange.h>
77 #include <sys/msgbuf.h>
78 #include <sys/mutex.h>
80 #include <sys/ptrace.h>
81 #include <sys/reboot.h>
82 #include <sys/sched.h>
83 #include <sys/signalvar.h>
84 #include <sys/sysctl.h>
85 #include <sys/sysent.h>
86 #include <sys/sysproto.h>
87 #include <sys/ucontext.h>
88 #include <sys/vmmeter.h>
91 #include <vm/vm_extern.h>
92 #include <vm/vm_kern.h>
93 #include <vm/vm_page.h>
94 #include <vm/vm_map.h>
95 #include <vm/vm_object.h>
96 #include <vm/vm_pager.h>
97 #include <vm/vm_param.h>
101 #error KDB must be enabled in order for DDB to work!
106 #include <net/netisr.h>
108 #include <machine/clock.h>
109 #include <machine/cpu.h>
110 #include <machine/cputypes.h>
111 #include <machine/intr_machdep.h>
112 #include <machine/md_var.h>
113 #include <machine/metadata.h>
114 #include <machine/pc/bios.h>
115 #include <machine/pcb.h>
116 #include <machine/proc.h>
117 #include <machine/reg.h>
118 #include <machine/sigframe.h>
119 #include <machine/specialreg.h>
121 #include <machine/perfmon.h>
123 #include <machine/tss.h>
125 #include <machine/smp.h>
129 #include <amd64/isa/icu.h>
131 #include <machine/apicvar.h>
134 #include <isa/isareg.h>
137 /* Sanity check for __curthread() */
138 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
140 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
142 extern void printcpuinfo(void); /* XXX header file */
143 extern void identify_cpu(void);
144 extern void panicifcpuunsupported(void);
146 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
147 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
149 static void cpu_startup(void *);
150 static void get_fpcontext(struct thread *td, mcontext_t *mcp);
151 static int set_fpcontext(struct thread *td, const mcontext_t *mcp);
152 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
155 extern vm_offset_t ksym_start, ksym_end;
158 int _udatasel, _ucodesel, _ucode32sel;
166 * The number of PHYSMAP entries must be one less than the number of
167 * PHYSSEG entries because the PHYSMAP entry that spans the largest
168 * physical address that is accessible by ISA DMA is split into two
171 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
173 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
174 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
176 /* must be 2 less so 0 0 can signal end of chunks */
177 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
178 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
180 struct kva_md_info kmi;
182 static struct trapframe proc0_tf;
183 struct region_descriptor r_gdt, r_idt;
185 struct pcpu __pcpu[MAXCPU];
189 struct mem_range_softc mem_range_softc;
196 * Good {morning,afternoon,evening,night}.
200 panicifcpuunsupported();
204 printf("usable memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem),
205 ptoa((uintmax_t)physmem) / 1048576);
208 * Display any holes after the first chunk of extended memory.
213 printf("Physical memory chunk(s):\n");
214 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
217 size = phys_avail[indx + 1] - phys_avail[indx];
219 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
220 (uintmax_t)phys_avail[indx],
221 (uintmax_t)phys_avail[indx + 1] - 1,
222 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
226 vm_ksubmap_init(&kmi);
228 printf("avail memory = %ju (%ju MB)\n",
229 ptoa((uintmax_t)cnt.v_free_count),
230 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
233 * Set up buffers, so they can be used to read disk labels.
236 vm_pager_bufferinit();
242 * Send an interrupt to process.
244 * Stack is set up to allow sigcode stored
245 * at top to call routine, followed by kcall
246 * to sigreturn routine below. After sigreturn
247 * resets the signal mask, the stack, and the
248 * frame pointer, it returns to the user
252 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
254 struct sigframe sf, *sfp;
259 struct trapframe *regs;
265 PROC_LOCK_ASSERT(p, MA_OWNED);
266 sig = ksi->ksi_signo;
268 mtx_assert(&psp->ps_mtx, MA_OWNED);
270 oonstack = sigonstack(regs->tf_rsp);
272 /* Save user context. */
273 bzero(&sf, sizeof(sf));
274 sf.sf_uc.uc_sigmask = *mask;
275 sf.sf_uc.uc_stack = td->td_sigstk;
276 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
277 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
278 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
279 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
280 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
281 get_fpcontext(td, &sf.sf_uc.uc_mcontext);
284 /* Allocate space for the signal handler context. */
285 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
286 SIGISMEMBER(psp->ps_sigonstack, sig)) {
287 sp = td->td_sigstk.ss_sp +
288 td->td_sigstk.ss_size - sizeof(struct sigframe);
289 #if defined(COMPAT_43)
290 td->td_sigstk.ss_flags |= SS_ONSTACK;
293 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
294 /* Align to 16 bytes. */
295 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
297 /* Translate the signal if appropriate. */
298 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
299 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
301 /* Build the argument list for the signal handler. */
302 regs->tf_rdi = sig; /* arg 1 in %rdi */
303 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
304 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
305 /* Signal handler installed with SA_SIGINFO. */
306 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
307 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
309 /* Fill in POSIX parts */
310 sf.sf_si = ksi->ksi_info;
311 sf.sf_si.si_signo = sig; /* maybe a translated signal */
312 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
314 /* Old FreeBSD-style arguments. */
315 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
316 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
317 sf.sf_ahu.sf_handler = catcher;
319 mtx_unlock(&psp->ps_mtx);
323 * Copy the sigframe out to the user's stack.
325 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
327 printf("process %ld has trashed its stack\n", (long)p->p_pid);
333 regs->tf_rsp = (long)sfp;
334 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
335 regs->tf_rflags &= ~PSL_T;
336 regs->tf_cs = _ucodesel;
338 mtx_lock(&psp->ps_mtx);
342 * System call to cleanup state after a signal
343 * has been taken. Reset signal mask and
344 * stack state from context left by sendsig (above).
345 * Return to previous pc and psl as specified by
346 * context left by sendsig. Check carefully to
347 * make sure that the user has not modified the
348 * state to gain improper privileges.
355 struct sigreturn_args /* {
356 const struct __ucontext *sigcntxp;
360 struct proc *p = td->td_proc;
361 struct trapframe *regs;
362 const ucontext_t *ucp;
367 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
372 rflags = ucp->uc_mcontext.mc_rflags;
374 * Don't allow users to change privileged or reserved flags.
377 * XXX do allow users to change the privileged flag PSL_RF.
378 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
379 * should sometimes set it there too. tf_rflags is kept in
380 * the signal context during signal handling and there is no
381 * other place to remember it, so the PSL_RF bit may be
382 * corrupted by the signal handler without us knowing.
383 * Corruption of the PSL_RF bit at worst causes one more or
384 * one less debugger trap, so allowing it is fairly harmless.
386 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
387 printf("sigreturn: rflags = 0x%lx\n", rflags);
392 * Don't allow users to load a valid privileged %cs. Let the
393 * hardware check for invalid selectors, excess privilege in
394 * other selectors, invalid %eip's and invalid %esp's.
396 cs = ucp->uc_mcontext.mc_cs;
397 if (!CS_SECURE(cs)) {
398 printf("sigreturn: cs = 0x%x\n", cs);
399 ksiginfo_init_trap(&ksi);
400 ksi.ksi_signo = SIGBUS;
401 ksi.ksi_code = BUS_OBJERR;
402 ksi.ksi_trapno = T_PROTFLT;
403 ksi.ksi_addr = (void *)regs->tf_rip;
404 trapsignal(td, &ksi);
408 ret = set_fpcontext(td, &ucp->uc_mcontext);
411 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
414 #if defined(COMPAT_43)
415 if (ucp->uc_mcontext.mc_onstack & 1)
416 td->td_sigstk.ss_flags |= SS_ONSTACK;
418 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
421 td->td_sigmask = ucp->uc_sigmask;
422 SIG_CANTMASK(td->td_sigmask);
425 td->td_pcb->pcb_flags |= PCB_FULLCTX;
426 return (EJUSTRETURN);
429 #ifdef COMPAT_FREEBSD4
431 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
434 return sigreturn(td, (struct sigreturn_args *)uap);
440 * Machine dependent boot() routine
442 * I haven't seen anything to put here yet
443 * Possibly some stuff might be grafted back here from boot()
450 /* Get current clock frequency for the given cpu id. */
452 cpu_est_clockrate(int cpu_id, uint64_t *rate)
457 if (pcpu_find(cpu_id) == NULL || rate == NULL)
460 /* If we're booting, trust the rate calibrated moments ago. */
467 /* Schedule ourselves on the indicated cpu. */
468 thread_lock(curthread);
469 sched_bind(curthread, cpu_id);
470 thread_unlock(curthread);
473 /* Calibrate by measuring a short delay. */
474 reg = intr_disable();
481 thread_lock(curthread);
482 sched_unbind(curthread);
483 thread_unlock(curthread);
487 * Calculate the difference in readings, convert to Mhz, and
488 * subtract 0.5% of the total. Empirical testing has shown that
489 * overhead in DELAY() works out to approximately this value.
492 *rate = tsc2 * 1000 - tsc2 * 5;
497 * Shutdown the CPU as much as possible
507 * Hook to idle the CPU when possible. In the SMP case we default to
508 * off because a halted cpu will not currently pick up a new thread in the
509 * run queue until the next timer tick. If turned on this will result in
510 * approximately a 4.2% loss in real time performance in buildworld tests
511 * (but improves user and sys times oddly enough), and saves approximately
512 * 5% in power consumption on an idle machine (tests w/2xCPU 1.1GHz P3).
514 * XXX we need to have a cpu mask of idle cpus and generate an IPI or
515 * otherwise generate some sort of interrupt to wake up cpus sitting in HLT.
516 * Then we can have our cake and eat it too.
518 * XXX I'm turning it on for SMP as well by default for now. It seems to
519 * help lock contention somewhat, and this is critical for HTT. -Peter
521 static int cpu_idle_hlt = 1;
522 TUNABLE_INT("machdep.cpu_idle_hlt", &cpu_idle_hlt);
523 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
524 &cpu_idle_hlt, 0, "Idle loop HLT enable");
527 cpu_idle_default(void)
530 * we must absolutely guarentee that hlt is the
531 * absolute next instruction after sti or we
532 * introduce a timing window.
534 __asm __volatile("sti; hlt");
538 * Note that we have to be careful here to avoid a race between checking
539 * sched_runnable() and actually halting. If we don't do this, we may waste
540 * the time between calling hlt and the next interrupt even though there
541 * is a runnable process.
548 if (mp_grab_cpu_hlt())
553 if (sched_runnable())
560 /* Other subsystems (e.g., ACPI) can hook this later. */
561 void (*cpu_idle_hook)(void) = cpu_idle_default;
564 * Clear registers on exec
567 exec_setregs(td, entry, stack, ps_strings)
573 struct trapframe *regs = td->td_frame;
574 struct pcb *pcb = td->td_pcb;
577 wrmsr(MSR_FSBASE, 0);
578 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
586 pcb->pcb_ds = _udatasel;
587 pcb->pcb_es = _udatasel;
588 pcb->pcb_fs = _udatasel;
589 pcb->pcb_gs = _udatasel;
591 bzero((char *)regs, sizeof(struct trapframe));
592 regs->tf_rip = entry;
593 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
594 regs->tf_rdi = stack; /* argv */
595 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
596 regs->tf_ss = _udatasel;
597 regs->tf_cs = _ucodesel;
600 * Reset the hardware debug registers if they were in use.
601 * They won't have any meaning for the newly exec'd process.
603 if (pcb->pcb_flags & PCB_DBREGS) {
610 if (pcb == PCPU_GET(curpcb)) {
612 * Clear the debug registers on the running
613 * CPU, otherwise they will end up affecting
614 * the next process we switch to.
618 pcb->pcb_flags &= ~PCB_DBREGS;
622 * Drop the FP state if we hold it, so that the process gets a
623 * clean FP state if it uses the FPU again.
635 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
636 * BSP. See the comments there about why we set them.
638 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
643 * Initialize amd64 and configure to run kernel
647 * Initialize segments & interrupt table
650 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor table */
651 static struct gate_descriptor idt0[NIDT];
652 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
654 static char dblfault_stack[PAGE_SIZE] __aligned(16);
656 struct amd64tss common_tss[MAXCPU];
658 /* software prototypes -- in more palatable form */
659 struct soft_segment_descriptor gdt_segs[] = {
660 /* GNULL_SEL 0 Null Descriptor */
661 { 0x0, /* segment base address */
663 0, /* segment type */
664 0, /* segment descriptor priority level */
665 0, /* segment descriptor present */
667 0, /* default 32 vs 16 bit size */
668 0 /* limit granularity (byte/page units)*/ },
669 /* GCODE_SEL 1 Code Descriptor for kernel */
670 { 0x0, /* segment base address */
671 0xfffff, /* length - all address space */
672 SDT_MEMERA, /* segment type */
673 SEL_KPL, /* segment descriptor priority level */
674 1, /* segment descriptor present */
676 0, /* default 32 vs 16 bit size */
677 1 /* limit granularity (byte/page units)*/ },
678 /* GDATA_SEL 2 Data Descriptor for kernel */
679 { 0x0, /* segment base address */
680 0xfffff, /* length - all address space */
681 SDT_MEMRWA, /* segment type */
682 SEL_KPL, /* segment descriptor priority level */
683 1, /* segment descriptor present */
685 0, /* default 32 vs 16 bit size */
686 1 /* limit granularity (byte/page units)*/ },
687 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
688 { 0x0, /* segment base address */
689 0xfffff, /* length - all address space */
690 SDT_MEMERA, /* segment type */
691 SEL_UPL, /* segment descriptor priority level */
692 1, /* segment descriptor present */
694 1, /* default 32 vs 16 bit size */
695 1 /* limit granularity (byte/page units)*/ },
696 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
697 { 0x0, /* segment base address */
698 0xfffff, /* length - all address space */
699 SDT_MEMRWA, /* segment type */
700 SEL_UPL, /* segment descriptor priority level */
701 1, /* segment descriptor present */
703 1, /* default 32 vs 16 bit size */
704 1 /* limit granularity (byte/page units)*/ },
705 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
706 { 0x0, /* segment base address */
707 0xfffff, /* length - all address space */
708 SDT_MEMERA, /* segment type */
709 SEL_UPL, /* segment descriptor priority level */
710 1, /* segment descriptor present */
712 0, /* default 32 vs 16 bit size */
713 1 /* limit granularity (byte/page units)*/ },
714 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
716 0x0, /* segment base address */
717 sizeof(struct amd64tss)-1,/* length - all address space */
718 SDT_SYSTSS, /* segment type */
719 SEL_KPL, /* segment descriptor priority level */
720 1, /* segment descriptor present */
722 0, /* unused - default 32 vs 16 bit size */
723 0 /* limit granularity (byte/page units)*/ },
724 /* Actually, the TSS is a system descriptor which is double size */
725 { 0x0, /* segment base address */
727 0, /* segment type */
728 0, /* segment descriptor priority level */
729 0, /* segment descriptor present */
731 0, /* default 32 vs 16 bit size */
732 0 /* limit granularity (byte/page units)*/ },
733 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
734 { 0x0, /* segment base address */
735 0xfffff, /* length - all address space */
736 SDT_MEMRWA, /* segment type */
737 SEL_UPL, /* segment descriptor priority level */
738 1, /* segment descriptor present */
740 1, /* default 32 vs 16 bit size */
741 1 /* limit granularity (byte/page units)*/ },
745 setidt(idx, func, typ, dpl, ist)
752 struct gate_descriptor *ip;
755 ip->gd_looffset = (uintptr_t)func;
756 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
762 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
766 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
767 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
768 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
769 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
770 IDTVEC(xmm), IDTVEC(dblfault),
771 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
775 struct user_segment_descriptor *sd;
776 struct soft_segment_descriptor *ssd;
779 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
780 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
781 ssd->ssd_type = sd->sd_type;
782 ssd->ssd_dpl = sd->sd_dpl;
783 ssd->ssd_p = sd->sd_p;
784 ssd->ssd_long = sd->sd_long;
785 ssd->ssd_def32 = sd->sd_def32;
786 ssd->ssd_gran = sd->sd_gran;
791 struct soft_segment_descriptor *ssd;
792 struct user_segment_descriptor *sd;
795 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
796 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
797 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
798 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
799 sd->sd_type = ssd->ssd_type;
800 sd->sd_dpl = ssd->ssd_dpl;
801 sd->sd_p = ssd->ssd_p;
802 sd->sd_long = ssd->ssd_long;
803 sd->sd_def32 = ssd->ssd_def32;
804 sd->sd_gran = ssd->ssd_gran;
809 struct soft_segment_descriptor *ssd;
810 struct system_segment_descriptor *sd;
813 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
814 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
815 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
816 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
817 sd->sd_type = ssd->ssd_type;
818 sd->sd_dpl = ssd->ssd_dpl;
819 sd->sd_p = ssd->ssd_p;
820 sd->sd_gran = ssd->ssd_gran;
823 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
824 #include <isa/isavar.h>
826 isa_irq_pending(void)
836 * Populate the (physmap) array with base/bound pairs describing the
837 * available physical memory in the system, then test this memory and
838 * build the phys_avail array describing the actually-available memory.
840 * If we cannot accurately determine the physical memory map, then use
841 * value from the 0xE801 call, and failing that, the RTC.
843 * Total memory size may be set by the kernel environment variable
844 * hw.physmem or the compile-time define MAXMEM.
846 * XXX first should be vm_paddr_t.
849 getmemsize(caddr_t kmdp, u_int64_t first)
851 int i, off, physmap_idx, pa_indx, da_indx;
852 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
853 u_long physmem_tunable;
855 struct bios_smap *smapbase, *smap, *smapend;
857 quad_t dcons_addr, dcons_size;
859 bzero(physmap, sizeof(physmap));
864 * get memory map from INT 15:E820, kindly supplied by the loader.
866 * subr_module.c says:
867 * "Consumer may safely assume that size value precedes data."
868 * ie: an int32_t immediately precedes smap.
870 smapbase = (struct bios_smap *)preload_search_info(kmdp,
871 MODINFO_METADATA | MODINFOMD_SMAP);
872 if (smapbase == NULL)
873 panic("No BIOS smap info from loader!");
875 smapsize = *((u_int32_t *)smapbase - 1);
876 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
878 for (smap = smapbase; smap < smapend; smap++) {
879 if (boothowto & RB_VERBOSE)
880 printf("SMAP type=%02x base=%016lx len=%016lx\n",
881 smap->type, smap->base, smap->length);
883 if (smap->type != SMAP_TYPE_MEMORY)
886 if (smap->length == 0)
889 for (i = 0; i <= physmap_idx; i += 2) {
890 if (smap->base < physmap[i + 1]) {
891 if (boothowto & RB_VERBOSE)
893 "Overlapping or non-monotonic memory region, ignoring second region\n");
898 if (smap->base == physmap[physmap_idx + 1]) {
899 physmap[physmap_idx + 1] += smap->length;
904 if (physmap_idx == PHYSMAP_SIZE) {
906 "Too many segments in the physical address map, giving up\n");
909 physmap[physmap_idx] = smap->base;
910 physmap[physmap_idx + 1] = smap->base + smap->length;
914 * Find the 'base memory' segment for SMP
917 for (i = 0; i <= physmap_idx; i += 2) {
918 if (physmap[i] == 0x00000000) {
919 basemem = physmap[i + 1] / 1024;
924 panic("BIOS smap did not include a basemem segment!");
927 /* make hole for AP bootstrap code */
928 physmap[1] = mp_bootaddress(physmap[1] / 1024);
932 * Maxmem isn't the "maximum memory", it's one larger than the
933 * highest page of the physical address space. It should be
934 * called something like "Maxphyspage". We may adjust this
935 * based on ``hw.physmem'' and the results of the memory test.
937 Maxmem = atop(physmap[physmap_idx + 1]);
943 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
944 Maxmem = atop(physmem_tunable);
947 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
950 if (Maxmem > atop(physmap[physmap_idx + 1]))
951 Maxmem = atop(physmap[physmap_idx + 1]);
953 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
954 (boothowto & RB_VERBOSE))
955 printf("Physical memory use set to %ldK\n", Maxmem * 4);
957 /* call pmap initialization to make new kernel address space */
958 pmap_bootstrap(&first);
961 * Size up each available chunk of physical memory.
963 physmap[0] = PAGE_SIZE; /* mask off page 0 */
966 phys_avail[pa_indx++] = physmap[0];
967 phys_avail[pa_indx] = physmap[0];
968 dump_avail[da_indx] = physmap[0];
972 * Get dcons buffer address
974 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
975 getenv_quad("dcons.size", &dcons_size) == 0)
979 * physmap is in bytes, so when converting to page boundaries,
980 * round up the start address and round down the end address.
982 for (i = 0; i <= physmap_idx; i += 2) {
985 end = ptoa((vm_paddr_t)Maxmem);
986 if (physmap[i + 1] < end)
987 end = trunc_page(physmap[i + 1]);
988 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
989 int tmp, page_bad, full;
990 int *ptr = (int *)CADDR1;
994 * block out kernel memory as not available.
996 if (pa >= 0x100000 && pa < first)
1000 * block out dcons buffer
1003 && pa >= trunc_page(dcons_addr)
1004 && pa < dcons_addr + dcons_size)
1010 * map page into kernel: valid, read/write,non-cacheable
1012 *pte = pa | PG_V | PG_RW | PG_N;
1017 * Test for alternating 1's and 0's
1019 *(volatile int *)ptr = 0xaaaaaaaa;
1020 if (*(volatile int *)ptr != 0xaaaaaaaa)
1023 * Test for alternating 0's and 1's
1025 *(volatile int *)ptr = 0x55555555;
1026 if (*(volatile int *)ptr != 0x55555555)
1031 *(volatile int *)ptr = 0xffffffff;
1032 if (*(volatile int *)ptr != 0xffffffff)
1037 *(volatile int *)ptr = 0x0;
1038 if (*(volatile int *)ptr != 0x0)
1041 * Restore original value.
1046 * Adjust array of valid/good pages.
1048 if (page_bad == TRUE)
1051 * If this good page is a continuation of the
1052 * previous set of good pages, then just increase
1053 * the end pointer. Otherwise start a new chunk.
1054 * Note that "end" points one higher than end,
1055 * making the range >= start and < end.
1056 * If we're also doing a speculative memory
1057 * test and we at or past the end, bump up Maxmem
1058 * so that we keep going. The first bad page
1059 * will terminate the loop.
1061 if (phys_avail[pa_indx] == pa) {
1062 phys_avail[pa_indx] += PAGE_SIZE;
1065 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1067 "Too many holes in the physical address space, giving up\n");
1072 phys_avail[pa_indx++] = pa; /* start */
1073 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1077 if (dump_avail[da_indx] == pa) {
1078 dump_avail[da_indx] += PAGE_SIZE;
1081 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1085 dump_avail[da_indx++] = pa; /* start */
1086 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1098 * The last chunk must contain at least one page plus the message
1099 * buffer to avoid complicating other code (message buffer address
1100 * calculation, etc.).
1102 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1103 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1104 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1105 phys_avail[pa_indx--] = 0;
1106 phys_avail[pa_indx--] = 0;
1109 Maxmem = atop(phys_avail[pa_indx]);
1111 /* Trim off space for the message buffer. */
1112 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1114 /* Map the message buffer. */
1115 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1116 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
1121 hammer_time(u_int64_t modulep, u_int64_t physfree)
1129 thread0.td_kstack = physfree + KERNBASE;
1130 bzero((void *)thread0.td_kstack, KSTACK_PAGES * PAGE_SIZE);
1131 physfree += KSTACK_PAGES * PAGE_SIZE;
1132 thread0.td_pcb = (struct pcb *)
1133 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
1136 * This may be done better later if it gets more high level
1137 * components in it. If so just link td->td_proc here.
1139 proc_linkup0(&proc0, &thread0);
1141 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1142 preload_bootstrap_relocate(KERNBASE);
1143 kmdp = preload_search_by_type("elf kernel");
1145 kmdp = preload_search_by_type("elf64 kernel");
1146 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1147 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1149 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1150 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1153 /* Init basic tunables, hz etc */
1157 * make gdt memory segments
1159 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1161 for (x = 0; x < NGDT; x++) {
1162 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1163 ssdtosd(&gdt_segs[x], &gdt[x]);
1165 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1166 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1168 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1169 r_gdt.rd_base = (long) gdt;
1173 wrmsr(MSR_FSBASE, 0); /* User value */
1174 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1175 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1177 pcpu_init(pc, 0, sizeof(struct pcpu));
1178 PCPU_SET(prvspace, pc);
1179 PCPU_SET(curthread, &thread0);
1180 PCPU_SET(curpcb, thread0.td_pcb);
1181 PCPU_SET(tssp, &common_tss[0]);
1184 * Initialize mutexes.
1186 * icu_lock: in order to allow an interrupt to occur in a critical
1187 * section, to set pcpu->ipending (etc...) properly, we
1188 * must be able to get the icu lock, so it can't be
1192 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1195 for (x = 0; x < NIDT; x++)
1196 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1197 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1198 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1199 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1200 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1201 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1202 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1203 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1204 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1205 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1206 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1207 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1208 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1209 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1210 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1211 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1212 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1213 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1214 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1215 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1217 r_idt.rd_limit = sizeof(idt0) - 1;
1218 r_idt.rd_base = (long) idt;
1222 * Initialize the i8254 before the console so that console
1223 * initialization can use DELAY().
1228 * Initialize the console before we print anything out.
1237 /* Reset and mask the atpics and leave them shut down. */
1241 * Point the ICU spurious interrupt vectors at the APIC spurious
1242 * interrupt handler.
1244 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1245 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1248 #error "have you forgotten the isa device?";
1254 if (boothowto & RB_KDB)
1255 kdb_enter("Boot flags requested debugger");
1258 identify_cpu(); /* Final stage of CPU initialization */
1259 initializecpu(); /* Initialize CPU registers */
1261 /* make an initial tss so cpu can get interrupt stack on syscall! */
1262 common_tss[0].tss_rsp0 = thread0.td_kstack + \
1263 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb);
1264 /* Ensure the stack is aligned to 16 bytes */
1265 common_tss[0].tss_rsp0 &= ~0xFul;
1266 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1268 /* doublefault stack space, runs on ist1 */
1269 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1271 /* Set the IO permission bitmap (empty due to tss seg limit) */
1272 common_tss[0].tss_iobase = sizeof(struct amd64tss);
1274 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1277 /* Set up the fast syscall stuff */
1278 msr = rdmsr(MSR_EFER) | EFER_SCE;
1279 wrmsr(MSR_EFER, msr);
1280 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1281 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1282 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1283 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1284 wrmsr(MSR_STAR, msr);
1285 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1287 getmemsize(kmdp, physfree);
1288 init_param2(physmem);
1290 /* now running on new page tables, configured,and u/iom is accessible */
1292 msgbufinit(msgbufp, MSGBUF_SIZE);
1295 /* transfer to user mode */
1297 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1298 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1299 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1301 /* setup proc 0's pcb */
1302 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */
1303 thread0.td_pcb->pcb_cr3 = KPML4phys;
1304 thread0.td_frame = &proc0_tf;
1306 env = getenv("kernelname");
1308 strlcpy(kernelname, env, sizeof(kernelname));
1310 /* Location of kernel stack for locore */
1311 return ((u_int64_t)thread0.td_pcb);
1315 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1318 pcpu->pc_acpi_id = 0xffffffff;
1322 spinlock_enter(void)
1327 if (td->td_md.md_spinlock_count == 0)
1328 td->td_md.md_saved_flags = intr_disable();
1329 td->td_md.md_spinlock_count++;
1340 td->td_md.md_spinlock_count--;
1341 if (td->td_md.md_spinlock_count == 0)
1342 intr_restore(td->td_md.md_saved_flags);
1346 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1347 * we want to start a backtrace from the function that caused us to enter
1348 * the debugger. We have the context in the trapframe, but base the trace
1349 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1350 * enough for a backtrace.
1353 makectx(struct trapframe *tf, struct pcb *pcb)
1356 pcb->pcb_r12 = tf->tf_r12;
1357 pcb->pcb_r13 = tf->tf_r13;
1358 pcb->pcb_r14 = tf->tf_r14;
1359 pcb->pcb_r15 = tf->tf_r15;
1360 pcb->pcb_rbp = tf->tf_rbp;
1361 pcb->pcb_rbx = tf->tf_rbx;
1362 pcb->pcb_rip = tf->tf_rip;
1363 pcb->pcb_rsp = (ISPL(tf->tf_cs)) ? tf->tf_rsp : (long)(tf + 1) - 8;
1367 ptrace_set_pc(struct thread *td, unsigned long addr)
1369 td->td_frame->tf_rip = addr;
1374 ptrace_single_step(struct thread *td)
1376 td->td_frame->tf_rflags |= PSL_T;
1381 ptrace_clear_single_step(struct thread *td)
1383 td->td_frame->tf_rflags &= ~PSL_T;
1388 fill_regs(struct thread *td, struct reg *regs)
1390 struct trapframe *tp;
1393 regs->r_r15 = tp->tf_r15;
1394 regs->r_r14 = tp->tf_r14;
1395 regs->r_r13 = tp->tf_r13;
1396 regs->r_r12 = tp->tf_r12;
1397 regs->r_r11 = tp->tf_r11;
1398 regs->r_r10 = tp->tf_r10;
1399 regs->r_r9 = tp->tf_r9;
1400 regs->r_r8 = tp->tf_r8;
1401 regs->r_rdi = tp->tf_rdi;
1402 regs->r_rsi = tp->tf_rsi;
1403 regs->r_rbp = tp->tf_rbp;
1404 regs->r_rbx = tp->tf_rbx;
1405 regs->r_rdx = tp->tf_rdx;
1406 regs->r_rcx = tp->tf_rcx;
1407 regs->r_rax = tp->tf_rax;
1408 regs->r_rip = tp->tf_rip;
1409 regs->r_cs = tp->tf_cs;
1410 regs->r_rflags = tp->tf_rflags;
1411 regs->r_rsp = tp->tf_rsp;
1412 regs->r_ss = tp->tf_ss;
1417 set_regs(struct thread *td, struct reg *regs)
1419 struct trapframe *tp;
1423 rflags = regs->r_rflags & 0xffffffff;
1424 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
1426 tp->tf_r15 = regs->r_r15;
1427 tp->tf_r14 = regs->r_r14;
1428 tp->tf_r13 = regs->r_r13;
1429 tp->tf_r12 = regs->r_r12;
1430 tp->tf_r11 = regs->r_r11;
1431 tp->tf_r10 = regs->r_r10;
1432 tp->tf_r9 = regs->r_r9;
1433 tp->tf_r8 = regs->r_r8;
1434 tp->tf_rdi = regs->r_rdi;
1435 tp->tf_rsi = regs->r_rsi;
1436 tp->tf_rbp = regs->r_rbp;
1437 tp->tf_rbx = regs->r_rbx;
1438 tp->tf_rdx = regs->r_rdx;
1439 tp->tf_rcx = regs->r_rcx;
1440 tp->tf_rax = regs->r_rax;
1441 tp->tf_rip = regs->r_rip;
1442 tp->tf_cs = regs->r_cs;
1443 tp->tf_rflags = rflags;
1444 tp->tf_rsp = regs->r_rsp;
1445 tp->tf_ss = regs->r_ss;
1446 td->td_pcb->pcb_flags |= PCB_FULLCTX;
1450 /* XXX check all this stuff! */
1451 /* externalize from sv_xmm */
1453 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
1455 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1456 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1460 bzero(fpregs, sizeof(*fpregs));
1462 /* FPU control/status */
1463 penv_fpreg->en_cw = penv_xmm->en_cw;
1464 penv_fpreg->en_sw = penv_xmm->en_sw;
1465 penv_fpreg->en_tw = penv_xmm->en_tw;
1466 penv_fpreg->en_opcode = penv_xmm->en_opcode;
1467 penv_fpreg->en_rip = penv_xmm->en_rip;
1468 penv_fpreg->en_rdp = penv_xmm->en_rdp;
1469 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
1470 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
1473 for (i = 0; i < 8; ++i)
1474 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
1477 for (i = 0; i < 16; ++i)
1478 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
1481 /* internalize from fpregs into sv_xmm */
1483 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
1485 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1486 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1490 /* FPU control/status */
1491 penv_xmm->en_cw = penv_fpreg->en_cw;
1492 penv_xmm->en_sw = penv_fpreg->en_sw;
1493 penv_xmm->en_tw = penv_fpreg->en_tw;
1494 penv_xmm->en_opcode = penv_fpreg->en_opcode;
1495 penv_xmm->en_rip = penv_fpreg->en_rip;
1496 penv_xmm->en_rdp = penv_fpreg->en_rdp;
1497 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
1498 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
1501 for (i = 0; i < 8; ++i)
1502 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
1505 for (i = 0; i < 16; ++i)
1506 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
1509 /* externalize from td->pcb */
1511 fill_fpregs(struct thread *td, struct fpreg *fpregs)
1514 fill_fpregs_xmm(&td->td_pcb->pcb_save, fpregs);
1518 /* internalize to td->pcb */
1520 set_fpregs(struct thread *td, struct fpreg *fpregs)
1523 set_fpregs_xmm(fpregs, &td->td_pcb->pcb_save);
1528 * Get machine context.
1531 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
1533 struct trapframe *tp;
1536 PROC_LOCK(curthread->td_proc);
1537 mcp->mc_onstack = sigonstack(tp->tf_rsp);
1538 PROC_UNLOCK(curthread->td_proc);
1539 mcp->mc_r15 = tp->tf_r15;
1540 mcp->mc_r14 = tp->tf_r14;
1541 mcp->mc_r13 = tp->tf_r13;
1542 mcp->mc_r12 = tp->tf_r12;
1543 mcp->mc_r11 = tp->tf_r11;
1544 mcp->mc_r10 = tp->tf_r10;
1545 mcp->mc_r9 = tp->tf_r9;
1546 mcp->mc_r8 = tp->tf_r8;
1547 mcp->mc_rdi = tp->tf_rdi;
1548 mcp->mc_rsi = tp->tf_rsi;
1549 mcp->mc_rbp = tp->tf_rbp;
1550 mcp->mc_rbx = tp->tf_rbx;
1551 mcp->mc_rcx = tp->tf_rcx;
1552 mcp->mc_rflags = tp->tf_rflags;
1553 if (flags & GET_MC_CLEAR_RET) {
1556 mcp->mc_rflags &= ~PSL_C;
1558 mcp->mc_rax = tp->tf_rax;
1559 mcp->mc_rdx = tp->tf_rdx;
1561 mcp->mc_rip = tp->tf_rip;
1562 mcp->mc_cs = tp->tf_cs;
1563 mcp->mc_rsp = tp->tf_rsp;
1564 mcp->mc_ss = tp->tf_ss;
1565 mcp->mc_len = sizeof(*mcp);
1566 get_fpcontext(td, mcp);
1571 * Set machine context.
1573 * However, we don't set any but the user modifiable flags, and we won't
1574 * touch the cs selector.
1577 set_mcontext(struct thread *td, const mcontext_t *mcp)
1579 struct trapframe *tp;
1584 if (mcp->mc_len != sizeof(*mcp))
1586 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
1587 (tp->tf_rflags & ~PSL_USERCHANGE);
1588 ret = set_fpcontext(td, mcp);
1591 tp->tf_r15 = mcp->mc_r15;
1592 tp->tf_r14 = mcp->mc_r14;
1593 tp->tf_r13 = mcp->mc_r13;
1594 tp->tf_r12 = mcp->mc_r12;
1595 tp->tf_r11 = mcp->mc_r11;
1596 tp->tf_r10 = mcp->mc_r10;
1597 tp->tf_r9 = mcp->mc_r9;
1598 tp->tf_r8 = mcp->mc_r8;
1599 tp->tf_rdi = mcp->mc_rdi;
1600 tp->tf_rsi = mcp->mc_rsi;
1601 tp->tf_rbp = mcp->mc_rbp;
1602 tp->tf_rbx = mcp->mc_rbx;
1603 tp->tf_rdx = mcp->mc_rdx;
1604 tp->tf_rcx = mcp->mc_rcx;
1605 tp->tf_rax = mcp->mc_rax;
1606 tp->tf_rip = mcp->mc_rip;
1607 tp->tf_rflags = rflags;
1608 tp->tf_rsp = mcp->mc_rsp;
1609 tp->tf_ss = mcp->mc_ss;
1610 td->td_pcb->pcb_flags |= PCB_FULLCTX;
1615 get_fpcontext(struct thread *td, mcontext_t *mcp)
1618 mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate);
1619 mcp->mc_fpformat = fpuformat();
1623 set_fpcontext(struct thread *td, const mcontext_t *mcp)
1625 struct savefpu *fpstate;
1627 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
1629 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
1631 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
1632 /* We don't care what state is left in the FPU or PCB. */
1634 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
1635 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
1637 * XXX we violate the dubious requirement that fpusetregs()
1638 * be called with interrupts disabled.
1639 * XXX obsolete on trap-16 systems?
1641 fpstate = (struct savefpu *)&mcp->mc_fpstate;
1642 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
1643 fpusetregs(td, fpstate);
1650 fpstate_drop(struct thread *td)
1655 if (PCPU_GET(fpcurthread) == td)
1658 * XXX force a full drop of the fpu. The above only drops it if we
1661 * XXX I don't much like fpugetregs()'s semantics of doing a full
1662 * drop. Dropping only to the pcb matches fnsave's behaviour.
1663 * We only need to drop to !PCB_INITDONE in sendsig(). But
1664 * sendsig() is the only caller of fpugetregs()... perhaps we just
1665 * have too many layers.
1667 curthread->td_pcb->pcb_flags &= ~PCB_FPUINITDONE;
1672 fill_dbregs(struct thread *td, struct dbreg *dbregs)
1677 dbregs->dr[0] = rdr0();
1678 dbregs->dr[1] = rdr1();
1679 dbregs->dr[2] = rdr2();
1680 dbregs->dr[3] = rdr3();
1681 dbregs->dr[6] = rdr6();
1682 dbregs->dr[7] = rdr7();
1685 dbregs->dr[0] = pcb->pcb_dr0;
1686 dbregs->dr[1] = pcb->pcb_dr1;
1687 dbregs->dr[2] = pcb->pcb_dr2;
1688 dbregs->dr[3] = pcb->pcb_dr3;
1689 dbregs->dr[6] = pcb->pcb_dr6;
1690 dbregs->dr[7] = pcb->pcb_dr7;
1706 set_dbregs(struct thread *td, struct dbreg *dbregs)
1712 load_dr0(dbregs->dr[0]);
1713 load_dr1(dbregs->dr[1]);
1714 load_dr2(dbregs->dr[2]);
1715 load_dr3(dbregs->dr[3]);
1716 load_dr6(dbregs->dr[6]);
1717 load_dr7(dbregs->dr[7]);
1720 * Don't let an illegal value for dr7 get set. Specifically,
1721 * check for undefined settings. Setting these bit patterns
1722 * result in undefined behaviour and can lead to an unexpected
1723 * TRCTRAP or a general protection fault right here.
1724 * Upper bits of dr6 and dr7 must not be set
1726 for (i = 0; i < 4; i++) {
1727 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
1729 if (td->td_frame->tf_cs == _ucode32sel &&
1730 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
1733 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
1734 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
1740 * Don't let a process set a breakpoint that is not within the
1741 * process's address space. If a process could do this, it
1742 * could halt the system by setting a breakpoint in the kernel
1743 * (if ddb was enabled). Thus, we need to check to make sure
1744 * that no breakpoints are being enabled for addresses outside
1745 * process's address space.
1747 * XXX - what about when the watched area of the user's
1748 * address space is written into from within the kernel
1749 * ... wouldn't that still cause a breakpoint to be generated
1750 * from within kernel mode?
1753 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
1754 /* dr0 is enabled */
1755 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
1758 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
1759 /* dr1 is enabled */
1760 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
1763 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
1764 /* dr2 is enabled */
1765 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
1768 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
1769 /* dr3 is enabled */
1770 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
1774 pcb->pcb_dr0 = dbregs->dr[0];
1775 pcb->pcb_dr1 = dbregs->dr[1];
1776 pcb->pcb_dr2 = dbregs->dr[2];
1777 pcb->pcb_dr3 = dbregs->dr[3];
1778 pcb->pcb_dr6 = dbregs->dr[6];
1779 pcb->pcb_dr7 = dbregs->dr[7];
1781 pcb->pcb_flags |= PCB_DBREGS;
1791 load_dr7(0); /* Turn off the control bits first */
1800 * Return > 0 if a hardware breakpoint has been hit, and the
1801 * breakpoint was in user space. Return 0, otherwise.
1804 user_dbreg_trap(void)
1806 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
1807 u_int64_t bp; /* breakpoint bits extracted from dr6 */
1808 int nbp; /* number of breakpoints that triggered */
1809 caddr_t addr[4]; /* breakpoint addresses */
1813 if ((dr7 & 0x000000ff) == 0) {
1815 * all GE and LE bits in the dr7 register are zero,
1816 * thus the trap couldn't have been caused by the
1817 * hardware debug registers
1824 bp = dr6 & 0x0000000f;
1828 * None of the breakpoint bits are set meaning this
1829 * trap was not caused by any of the debug registers
1835 * at least one of the breakpoints were hit, check to see
1836 * which ones and if any of them are user space addresses
1840 addr[nbp++] = (caddr_t)rdr0();
1843 addr[nbp++] = (caddr_t)rdr1();
1846 addr[nbp++] = (caddr_t)rdr2();
1849 addr[nbp++] = (caddr_t)rdr3();
1852 for (i = 0; i < nbp; i++) {
1853 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
1855 * addr[i] is in user space
1862 * None of the breakpoints are in user space.
1870 * Provide inb() and outb() as functions. They are normally only
1871 * available as macros calling inlined functions, thus cannot be
1872 * called from the debugger.
1874 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
1880 /* silence compiler warnings */
1882 void outb(u_int, u_char);
1889 * We use %%dx and not %1 here because i/o is done at %dx and not at
1890 * %edx, while gcc generates inferior code (movw instead of movl)
1891 * if we tell it to load (u_short) port.
1893 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
1898 outb(u_int port, u_char data)
1902 * Use an unnecessary assignment to help gcc's register allocator.
1903 * This make a large difference for gcc-1.40 and a tiny difference
1904 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
1905 * best results. gcc-2.6.0 can't handle this.
1908 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));