2 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
3 * Copyright (c) 1992 Terrence R. Lambert.
4 * Copyright (c) 2003 Peter Wemm.
5 * Copyright (c) 2008 The DragonFly Project.
8 * This code is derived from software contributed to Berkeley by
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
40 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $
43 //#include "use_npx.h"
45 #include "opt_compat.h"
48 #include "opt_directio.h"
51 #include "opt_msgbuf.h"
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/sysproto.h>
57 #include <sys/signalvar.h>
58 #include <sys/kernel.h>
59 #include <sys/linker.h>
60 #include <sys/malloc.h>
64 #include <sys/reboot.h>
66 #include <sys/msgbuf.h>
67 #include <sys/sysent.h>
68 #include <sys/sysctl.h>
69 #include <sys/vmmeter.h>
71 #include <sys/usched.h>
74 #include <sys/ctype.h>
75 #include <sys/serialize.h>
76 #include <sys/systimer.h>
79 #include <vm/vm_param.h>
81 #include <vm/vm_kern.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_map.h>
85 #include <vm/vm_pager.h>
86 #include <vm/vm_extern.h>
88 #include <sys/thread2.h>
89 #include <sys/mplock2.h>
90 #include <sys/mutex2.h>
98 #include <machine/cpu.h>
99 #include <machine/clock.h>
100 #include <machine/specialreg.h>
102 #include <machine/bootinfo.h>
104 #include <machine/md_var.h>
105 #include <machine/metadata.h>
106 #include <machine/pc/bios.h>
107 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
108 #include <machine/globaldata.h> /* CPU_prvspace */
109 #include <machine/smp.h>
111 #include <machine/perfmon.h>
113 #include <machine/cputypes.h>
114 #include <machine/intr_machdep.h>
117 #include <bus/isa/isa_device.h>
119 #include <machine_base/isa/isa_intr.h>
120 #include <bus/isa/rtc.h>
121 #include <sys/random.h>
122 #include <sys/ptrace.h>
123 #include <machine/sigframe.h>
125 #include <sys/machintr.h>
126 #include <machine_base/icu/icu_abi.h>
127 #include <machine_base/icu/elcr_var.h>
128 #include <machine_base/apic/lapic.h>
129 #include <machine_base/apic/ioapic.h>
130 #include <machine_base/apic/ioapic_abi.h>
131 #include <machine/mptable.h>
133 #define PHYSMAP_ENTRIES 10
135 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
137 extern void printcpuinfo(void); /* XXX header file */
138 extern void identify_cpu(void);
140 extern void finishidentcpu(void);
142 extern void panicifcpuunsupported(void);
144 static void cpu_startup(void *);
145 static void pic_finish(void *);
146 static void cpu_finish(void *);
148 #ifndef CPU_DISABLE_SSE
149 static void set_fpregs_xmm(struct save87 *, struct savexmm *);
150 static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
151 #endif /* CPU_DISABLE_SSE */
153 extern void ffs_rawread_setup(void);
154 #endif /* DIRECTIO */
155 static void init_locks(void);
157 SYSINIT(cpu, SI_BOOT2_START_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
158 SYSINIT(pic_finish, SI_BOOT2_FINISH_PIC, SI_ORDER_FIRST, pic_finish, NULL)
159 SYSINIT(cpu_finish, SI_BOOT2_FINISH_CPU, SI_ORDER_FIRST, cpu_finish, NULL)
162 extern vm_offset_t ksym_start, ksym_end;
165 struct privatespace CPU_prvspace[MAXCPU] __aligned(4096); /* XXX */
167 int _udatasel, _ucodesel, _ucode32sel;
169 int64_t tsc_offsets[MAXCPU];
171 static int cpu_mwait_halt; /* MWAIT hint (EAX) or CPU_MWAIT_HINT_ */
173 #if defined(SWTCH_OPTIM_STATS)
174 extern int swtch_optim_stats;
175 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
176 CTLFLAG_RD, &swtch_optim_stats, 0, "");
177 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
178 CTLFLAG_RD, &tlb_flush_count, 0, "");
180 SYSCTL_INT(_hw, OID_AUTO, cpu_mwait_halt,
181 CTLFLAG_RD, &cpu_mwait_halt, 0, "");
182 SYSCTL_INT(_hw, OID_AUTO, cpu_mwait_spin, CTLFLAG_RD, &cpu_mwait_spin, 0,
183 "monitor/mwait target state");
185 #define CPU_MWAIT_C1 1
186 #define CPU_MWAIT_C2 2
187 #define CPU_MWAIT_C3 3
188 #define CPU_MWAIT_CX_MAX 8
190 #define CPU_MWAIT_HINT_AUTO -1 /* C1 and C2 */
191 #define CPU_MWAIT_HINT_AUTODEEP -2 /* C3+ */
193 SYSCTL_NODE(_machdep, 0, mwait, CTLFLAG_RW, 0, "MWAIT features");
194 SYSCTL_NODE(_machdep_mwait, 0, CX, CTLFLAG_RW, 0, "MWAIT Cx settings");
196 struct cpu_mwait_cx {
199 struct sysctl_ctx_list sysctl_ctx;
200 struct sysctl_oid *sysctl_tree;
202 static struct cpu_mwait_cx cpu_mwait_cx_info[CPU_MWAIT_CX_MAX];
203 static char cpu_mwait_cx_supported[256];
205 static int cpu_mwait_hints_cnt;
206 static int *cpu_mwait_hints;
208 static int cpu_mwait_deep_hints_cnt;
209 static int *cpu_mwait_deep_hints;
211 #define CPU_IDLE_REPEAT_DEFAULT 750
213 static u_int cpu_idle_repeat = CPU_IDLE_REPEAT_DEFAULT;
214 static u_long cpu_idle_repeat_max = CPU_IDLE_REPEAT_DEFAULT;
216 #define CPU_MWAIT_C3_PREAMBLE_BM_ARB 0x1
217 #define CPU_MWAIT_C3_PREAMBLE_BM_STS 0x2
219 static int cpu_mwait_c3_preamble =
220 CPU_MWAIT_C3_PREAMBLE_BM_ARB |
221 CPU_MWAIT_C3_PREAMBLE_BM_STS;
223 SYSCTL_STRING(_machdep_mwait_CX, OID_AUTO, supported, CTLFLAG_RD,
224 cpu_mwait_cx_supported, 0, "MWAIT supported C states");
226 static struct lwkt_serialize cpu_mwait_cx_slize = LWKT_SERIALIZE_INITIALIZER;
227 static int cpu_mwait_cx_select_sysctl(SYSCTL_HANDLER_ARGS,
229 static int cpu_mwait_cx_idle_sysctl(SYSCTL_HANDLER_ARGS);
230 static int cpu_mwait_cx_spin_sysctl(SYSCTL_HANDLER_ARGS);
232 SYSCTL_PROC(_machdep_mwait_CX, OID_AUTO, idle, CTLTYPE_STRING|CTLFLAG_RW,
233 NULL, 0, cpu_mwait_cx_idle_sysctl, "A", "");
234 SYSCTL_PROC(_machdep_mwait_CX, OID_AUTO, spin, CTLTYPE_STRING|CTLFLAG_RW,
235 NULL, 0, cpu_mwait_cx_spin_sysctl, "A", "");
239 u_long ebda_addr = 0;
241 int imcr_present = 0;
243 int naps = 0; /* # of Applications processors */
246 struct mtx dt_lock; /* lock for GDT and LDT */
249 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
251 u_long pmem = ctob(physmem);
253 int error = sysctl_handle_long(oidp, &pmem, 0, req);
257 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
258 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
261 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
263 int error = sysctl_handle_int(oidp, 0,
264 ctob(physmem - vmstats.v_wire_count), req);
268 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
269 0, 0, sysctl_hw_usermem, "IU", "");
272 sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
274 int error = sysctl_handle_int(oidp, 0,
275 x86_64_btop(avail_end - avail_start), req);
279 SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
280 0, 0, sysctl_hw_availpages, "I", "");
286 * The number of PHYSMAP entries must be one less than the number of
287 * PHYSSEG entries because the PHYSMAP entry that spans the largest
288 * physical address that is accessible by ISA DMA is split into two
291 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
293 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
294 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
296 /* must be 2 less so 0 0 can signal end of chunks */
297 #define PHYS_AVAIL_ARRAY_END (NELEM(phys_avail) - 2)
298 #define DUMP_AVAIL_ARRAY_END (NELEM(dump_avail) - 2)
300 static vm_offset_t buffer_sva, buffer_eva;
301 vm_offset_t clean_sva, clean_eva;
302 static vm_offset_t pager_sva, pager_eva;
303 static struct trapframe proc0_tf;
306 cpu_startup(void *dummy)
310 vm_offset_t firstaddr;
313 * Good {morning,afternoon,evening,night}.
315 kprintf("%s", version);
318 panicifcpuunsupported();
322 kprintf("real memory = %ju (%ju MB)\n",
324 (intmax_t)Realmem / 1024 / 1024);
326 * Display any holes after the first chunk of extended memory.
331 kprintf("Physical memory chunk(s):\n");
332 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
333 vm_paddr_t size1 = phys_avail[indx + 1] - phys_avail[indx];
335 kprintf("0x%08jx - 0x%08jx, %ju bytes (%ju pages)\n",
336 (intmax_t)phys_avail[indx],
337 (intmax_t)phys_avail[indx + 1] - 1,
339 (intmax_t)(size1 / PAGE_SIZE));
344 * Allocate space for system data structures.
345 * The first available kernel virtual address is in "v".
346 * As pages of kernel virtual memory are allocated, "v" is incremented.
347 * As pages of memory are allocated and cleared,
348 * "firstaddr" is incremented.
349 * An index into the kernel page table corresponding to the
350 * virtual memory address maintained in "v" is kept in "mapaddr".
354 * Make two passes. The first pass calculates how much memory is
355 * needed and allocates it. The second pass assigns virtual
356 * addresses to the various data structures.
360 v = (caddr_t)firstaddr;
362 #define valloc(name, type, num) \
363 (name) = (type *)v; v = (caddr_t)((name)+(num))
364 #define valloclim(name, type, num, lim) \
365 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
368 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
369 * For the first 64MB of ram nominally allocate sufficient buffers to
370 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
371 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
372 * the buffer cache we limit the eventual kva reservation to
375 * factor represents the 1/4 x ram conversion.
378 long factor = 4 * BKVASIZE / 1024;
379 long kbytes = physmem * (PAGE_SIZE / 1024);
383 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
385 nbuf += (kbytes - 65536) * 2 / (factor * 5);
386 if (maxbcache && nbuf > maxbcache / BKVASIZE)
387 nbuf = maxbcache / BKVASIZE;
391 * Do not allow the buffer_map to be more then 1/2 the size of the
394 if (nbuf > (virtual_end - virtual_start +
395 virtual2_end - virtual2_start) / (BKVASIZE * 2)) {
396 nbuf = (virtual_end - virtual_start +
397 virtual2_end - virtual2_start) / (BKVASIZE * 2);
398 kprintf("Warning: nbufs capped at %ld due to kvm\n", nbuf);
402 * Do not allow the buffer_map to use more than 50% of available
403 * physical-equivalent memory. Since the VM pages which back
404 * individual buffers are typically wired, having too many bufs
405 * can prevent the system from paging properly.
407 if (nbuf > physmem * PAGE_SIZE / (BKVASIZE * 2)) {
408 nbuf = physmem * PAGE_SIZE / (BKVASIZE * 2);
409 kprintf("Warning: nbufs capped at %ld due to physmem\n", nbuf);
413 * Do not allow the sizeof(struct buf) * nbuf to exceed half of
414 * the valloc space which is just the virtual_end - virtual_start
415 * section. We use valloc() to allocate the buf header array.
417 if (nbuf > (virtual_end - virtual_start) / sizeof(struct buf) / 2) {
418 nbuf = (virtual_end - virtual_start) /
419 sizeof(struct buf) / 2;
420 kprintf("Warning: nbufs capped at %ld due to valloc "
421 "considerations", nbuf);
424 nswbuf = lmax(lmin(nbuf / 4, 256), 16);
426 if (nswbuf < NSWBUF_MIN)
433 valloc(swbuf, struct buf, nswbuf);
434 valloc(buf, struct buf, nbuf);
437 * End of first pass, size has been calculated so allocate memory
439 if (firstaddr == 0) {
440 size = (vm_size_t)(v - firstaddr);
441 firstaddr = kmem_alloc(&kernel_map, round_page(size));
443 panic("startup: no room for tables");
448 * End of second pass, addresses have been assigned
450 * nbuf is an int, make sure we don't overflow the field.
452 * On 64-bit systems we always reserve maximal allocations for
453 * buffer cache buffers and there are no fragmentation issues,
454 * so the KVA segment does not have to be excessively oversized.
456 if ((vm_size_t)(v - firstaddr) != size)
457 panic("startup: table size inconsistency");
459 kmem_suballoc(&kernel_map, &clean_map, &clean_sva, &clean_eva,
460 ((vm_offset_t)(nbuf + 16) * BKVASIZE) +
461 (nswbuf * MAXPHYS) + pager_map_size);
462 kmem_suballoc(&clean_map, &buffer_map, &buffer_sva, &buffer_eva,
463 ((vm_offset_t)(nbuf + 16) * BKVASIZE));
464 buffer_map.system_map = 1;
465 kmem_suballoc(&clean_map, &pager_map, &pager_sva, &pager_eva,
466 ((vm_offset_t)nswbuf * MAXPHYS) + pager_map_size);
467 pager_map.system_map = 1;
469 #if defined(USERCONFIG)
471 cninit(); /* the preferred console may have changed */
474 kprintf("avail memory = %ju (%ju MB)\n",
475 (uintmax_t)ptoa(vmstats.v_free_count + vmstats.v_dma_pages),
476 (uintmax_t)ptoa(vmstats.v_free_count + vmstats.v_dma_pages) /
480 struct cpu_idle_stat {
485 u_long mwait_cx[CPU_MWAIT_CX_MAX];
488 #define CPU_IDLE_STAT_HALT -1
489 #define CPU_IDLE_STAT_SPIN -2
491 static struct cpu_idle_stat cpu_idle_stats[MAXCPU];
494 sysctl_cpu_idle_cnt(SYSCTL_HANDLER_ARGS)
496 int idx = arg2, cpu, error;
499 if (idx == CPU_IDLE_STAT_HALT) {
500 for (cpu = 0; cpu < ncpus; ++cpu)
501 val += cpu_idle_stats[cpu].halt;
502 } else if (idx == CPU_IDLE_STAT_SPIN) {
503 for (cpu = 0; cpu < ncpus; ++cpu)
504 val += cpu_idle_stats[cpu].spin;
506 KASSERT(idx >= 0 && idx < CPU_MWAIT_CX_MAX,
507 ("invalid index %d", idx));
508 for (cpu = 0; cpu < ncpus; ++cpu)
509 val += cpu_idle_stats[cpu].mwait_cx[idx];
512 error = sysctl_handle_quad(oidp, &val, 0, req);
513 if (error || req->newptr == NULL)
516 if (idx == CPU_IDLE_STAT_HALT) {
517 for (cpu = 0; cpu < ncpus; ++cpu)
518 cpu_idle_stats[cpu].halt = 0;
519 cpu_idle_stats[0].halt = val;
520 } else if (idx == CPU_IDLE_STAT_SPIN) {
521 for (cpu = 0; cpu < ncpus; ++cpu)
522 cpu_idle_stats[cpu].spin = 0;
523 cpu_idle_stats[0].spin = val;
525 KASSERT(idx >= 0 && idx < CPU_MWAIT_CX_MAX,
526 ("invalid index %d", idx));
527 for (cpu = 0; cpu < ncpus; ++cpu)
528 cpu_idle_stats[cpu].mwait_cx[idx] = 0;
529 cpu_idle_stats[0].mwait_cx[idx] = val;
535 cpu_mwait_attach(void)
540 if ((cpu_feature2 & CPUID2_MON) == 0 ||
541 (cpu_mwait_feature & CPUID_MWAIT_EXT) == 0)
544 if (cpu_vendor_id == CPU_VENDOR_INTEL &&
545 (CPUID_TO_FAMILY(cpu_id) > 0xf ||
546 (CPUID_TO_FAMILY(cpu_id) == 0x6 &&
547 CPUID_TO_MODEL(cpu_id) >= 0xf))) {
548 atomic_clear_int(&cpu_mwait_c3_preamble,
549 CPU_MWAIT_C3_PREAMBLE_BM_ARB);
552 sbuf_new(&sb, cpu_mwait_cx_supported,
553 sizeof(cpu_mwait_cx_supported), SBUF_FIXEDLEN);
555 for (i = 0; i < CPU_MWAIT_CX_MAX; ++i) {
556 struct cpu_mwait_cx *cx = &cpu_mwait_cx_info[i];
559 ksnprintf(cx->name, sizeof(cx->name), "C%d", i);
561 sysctl_ctx_init(&cx->sysctl_ctx);
562 cx->sysctl_tree = SYSCTL_ADD_NODE(&cx->sysctl_ctx,
563 SYSCTL_STATIC_CHILDREN(_machdep_mwait), OID_AUTO,
564 cx->name, CTLFLAG_RW, NULL, "Cx control/info");
565 if (cx->sysctl_tree == NULL)
568 cx->subcnt = CPUID_MWAIT_CX_SUBCNT(cpu_mwait_extemu, i);
569 SYSCTL_ADD_INT(&cx->sysctl_ctx,
570 SYSCTL_CHILDREN(cx->sysctl_tree), OID_AUTO,
571 "subcnt", CTLFLAG_RD, &cx->subcnt, 0,
573 SYSCTL_ADD_PROC(&cx->sysctl_ctx,
574 SYSCTL_CHILDREN(cx->sysctl_tree), OID_AUTO,
575 "entered", (CTLTYPE_QUAD | CTLFLAG_RW), 0,
576 i, sysctl_cpu_idle_cnt, "Q", "# of times entered");
578 for (sub = 0; sub < cx->subcnt; ++sub)
579 sbuf_printf(&sb, "C%d/%d ", i, sub);
587 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_C3; ++i)
588 cpu_mwait_hints_cnt += cpu_mwait_cx_info[i].subcnt;
589 cpu_mwait_hints = kmalloc(sizeof(int) * cpu_mwait_hints_cnt,
593 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_C3; ++i) {
596 subcnt = cpu_mwait_cx_info[i].subcnt;
597 for (j = 0; j < subcnt; ++j) {
598 KASSERT(hint_idx < cpu_mwait_hints_cnt,
599 ("invalid mwait hint index %d", hint_idx));
600 cpu_mwait_hints[hint_idx] = MWAIT_EAX_HINT(i, j);
604 KASSERT(hint_idx == cpu_mwait_hints_cnt,
605 ("mwait hint count %d != index %d",
606 cpu_mwait_hints_cnt, hint_idx));
609 kprintf("MWAIT hints:\n");
610 for (i = 0; i < cpu_mwait_hints_cnt; ++i) {
611 int hint = cpu_mwait_hints[i];
613 kprintf(" C%d/%d hint 0x%04x\n",
614 MWAIT_EAX_TO_CX(hint), MWAIT_EAX_TO_CX_SUB(hint),
622 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_CX_MAX; ++i)
623 cpu_mwait_deep_hints_cnt += cpu_mwait_cx_info[i].subcnt;
624 cpu_mwait_deep_hints = kmalloc(sizeof(int) * cpu_mwait_deep_hints_cnt,
628 for (i = CPU_MWAIT_C1; i < CPU_MWAIT_CX_MAX; ++i) {
631 subcnt = cpu_mwait_cx_info[i].subcnt;
632 for (j = 0; j < subcnt; ++j) {
633 KASSERT(hint_idx < cpu_mwait_deep_hints_cnt,
634 ("invalid mwait deep hint index %d", hint_idx));
635 cpu_mwait_deep_hints[hint_idx] = MWAIT_EAX_HINT(i, j);
639 KASSERT(hint_idx == cpu_mwait_deep_hints_cnt,
640 ("mwait deep hint count %d != index %d",
641 cpu_mwait_deep_hints_cnt, hint_idx));
644 kprintf("MWAIT deep hints:\n");
645 for (i = 0; i < cpu_mwait_deep_hints_cnt; ++i) {
646 int hint = cpu_mwait_deep_hints[i];
648 kprintf(" C%d/%d hint 0x%04x\n",
649 MWAIT_EAX_TO_CX(hint), MWAIT_EAX_TO_CX_SUB(hint),
653 cpu_idle_repeat_max = 64 * cpu_mwait_deep_hints_cnt;
657 cpu_finish(void *dummy __unused)
664 pic_finish(void *dummy __unused)
666 /* Log ELCR information */
669 /* Log MPTABLE information */
670 mptable_pci_int_dump();
673 MachIntrABI.finalize();
677 * Send an interrupt to process.
679 * Stack is set up to allow sigcode stored
680 * at top to call routine, followed by kcall
681 * to sigreturn routine below. After sigreturn
682 * resets the signal mask, the stack, and the
683 * frame pointer, it returns to the user
687 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
689 struct lwp *lp = curthread->td_lwp;
690 struct proc *p = lp->lwp_proc;
691 struct trapframe *regs;
692 struct sigacts *psp = p->p_sigacts;
693 struct sigframe sf, *sfp;
697 regs = lp->lwp_md.md_regs;
698 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
700 /* Save user context */
701 bzero(&sf, sizeof(struct sigframe));
702 sf.sf_uc.uc_sigmask = *mask;
703 sf.sf_uc.uc_stack = lp->lwp_sigstk;
704 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
705 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
706 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
708 /* Make the size of the saved context visible to userland */
709 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
711 /* Allocate and validate space for the signal handler context. */
712 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack &&
713 SIGISMEMBER(psp->ps_sigonstack, sig)) {
714 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
715 sizeof(struct sigframe));
716 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
718 /* We take red zone into account */
719 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
723 * XXX AVX needs 64-byte alignment but sigframe has other fields and
724 * the embedded ucontext is not at the front, so aligning this won't
725 * help us. Fortunately we bcopy in/out of the sigframe, so the
728 * The problem though is if userland winds up trying to use the
731 sfp = (struct sigframe *)((intptr_t)sp & ~(intptr_t)0xF);
733 /* Translate the signal is appropriate */
734 if (p->p_sysent->sv_sigtbl) {
735 if (sig <= p->p_sysent->sv_sigsize)
736 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
740 * Build the argument list for the signal handler.
742 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
744 regs->tf_rdi = sig; /* argument 1 */
745 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
747 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
749 * Signal handler installed with SA_SIGINFO.
751 * action(signo, siginfo, ucontext)
753 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
754 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
755 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
757 /* fill siginfo structure */
758 sf.sf_si.si_signo = sig;
759 sf.sf_si.si_code = code;
760 sf.sf_si.si_addr = (void *)regs->tf_addr;
763 * Old FreeBSD-style arguments.
765 * handler (signo, code, [uc], addr)
767 regs->tf_rsi = (register_t)code; /* argument 2 */
768 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
769 sf.sf_ahu.sf_handler = catcher;
773 * If we're a vm86 process, we want to save the segment registers.
774 * We also change eflags to be our emulated eflags, not the actual
778 if (regs->tf_eflags & PSL_VM) {
779 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
780 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
782 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
783 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
784 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
785 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
787 if (vm86->vm86_has_vme == 0)
788 sf.sf_uc.uc_mcontext.mc_eflags =
789 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
790 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
793 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
794 * syscalls made by the signal handler. This just avoids
795 * wasting time for our lazy fixup of such faults. PSL_NT
796 * does nothing in vm86 mode, but vm86 programs can set it
797 * almost legitimately in probes for old cpu types.
799 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
804 * Save the FPU state and reinit the FP unit
806 npxpush(&sf.sf_uc.uc_mcontext);
809 * Copy the sigframe out to the user's stack.
811 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
813 * Something is wrong with the stack pointer.
814 * ...Kill the process.
819 regs->tf_rsp = (register_t)sfp;
820 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
823 * i386 abi specifies that the direction flag must be cleared
826 regs->tf_rflags &= ~(PSL_T|PSL_D);
829 * 64 bit mode has a code and stack selector but
830 * no data or extra selector. %fs and %gs are not
833 regs->tf_cs = _ucodesel;
834 regs->tf_ss = _udatasel;
839 * Sanitize the trapframe for a virtual kernel passing control to a custom
840 * VM context. Remove any items that would otherwise create a privilage
843 * XXX at the moment we allow userland to set the resume flag. Is this a
847 cpu_sanitize_frame(struct trapframe *frame)
849 frame->tf_cs = _ucodesel;
850 frame->tf_ss = _udatasel;
851 /* XXX VM (8086) mode not supported? */
852 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
853 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
859 * Sanitize the tls so loading the descriptor does not blow up
860 * on us. For x86_64 we don't have to do anything.
863 cpu_sanitize_tls(struct savetls *tls)
869 * sigreturn(ucontext_t *sigcntxp)
871 * System call to cleanup state after a signal
872 * has been taken. Reset signal mask and
873 * stack state from context left by sendsig (above).
874 * Return to previous pc and psl as specified by
875 * context left by sendsig. Check carefully to
876 * make sure that the user has not modified the
877 * state to gain improper privileges.
881 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
882 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
885 sys_sigreturn(struct sigreturn_args *uap)
887 struct lwp *lp = curthread->td_lwp;
888 struct trapframe *regs;
896 * We have to copy the information into kernel space so userland
897 * can't modify it while we are sniffing it.
899 regs = lp->lwp_md.md_regs;
900 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
904 rflags = ucp->uc_mcontext.mc_rflags;
906 /* VM (8086) mode not supported */
907 rflags &= ~PSL_VM_UNSUPP;
910 if (eflags & PSL_VM) {
911 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
912 struct vm86_kernel *vm86;
915 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
916 * set up the vm86 area, and we can't enter vm86 mode.
918 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
920 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
921 if (vm86->vm86_inited == 0)
924 /* go back to user mode if both flags are set */
925 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
926 trapsignal(lp, SIGBUS, 0);
928 if (vm86->vm86_has_vme) {
929 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
930 (eflags & VME_USERCHANGE) | PSL_VM;
932 vm86->vm86_eflags = eflags; /* save VIF, VIP */
933 eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
934 (eflags & VM_USERCHANGE) | PSL_VM;
936 bcopy(&ucp->uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
937 tf->tf_eflags = eflags;
938 tf->tf_vm86_ds = tf->tf_ds;
939 tf->tf_vm86_es = tf->tf_es;
940 tf->tf_vm86_fs = tf->tf_fs;
941 tf->tf_vm86_gs = tf->tf_gs;
942 tf->tf_ds = _udatasel;
943 tf->tf_es = _udatasel;
944 tf->tf_fs = _udatasel;
945 tf->tf_gs = _udatasel;
950 * Don't allow users to change privileged or reserved flags.
953 * XXX do allow users to change the privileged flag PSL_RF.
954 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
955 * should sometimes set it there too. tf_eflags is kept in
956 * the signal context during signal handling and there is no
957 * other place to remember it, so the PSL_RF bit may be
958 * corrupted by the signal handler without us knowing.
959 * Corruption of the PSL_RF bit at worst causes one more or
960 * one less debugger trap, so allowing it is fairly harmless.
962 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
963 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
968 * Don't allow users to load a valid privileged %cs. Let the
969 * hardware check for invalid selectors, excess privilege in
970 * other selectors, invalid %eip's and invalid %esp's.
972 cs = ucp->uc_mcontext.mc_cs;
973 if (!CS_SECURE(cs)) {
974 kprintf("sigreturn: cs = 0x%x\n", cs);
975 trapsignal(lp, SIGBUS, T_PROTFLT);
978 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
982 * Restore the FPU state from the frame
985 npxpop(&ucp->uc_mcontext);
987 if (ucp->uc_mcontext.mc_onstack & 1)
988 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
990 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
992 lp->lwp_sigmask = ucp->uc_sigmask;
993 SIG_CANTMASK(lp->lwp_sigmask);
1000 * Machine dependent boot() routine
1002 * I haven't seen anything to put here yet
1003 * Possibly some stuff might be grafted back here from boot()
1011 * Shutdown the CPU as much as possible
1017 __asm__ __volatile("hlt");
1021 * cpu_idle() represents the idle LWKT. You cannot return from this function
1022 * (unless you want to blow things up!). Instead we look for runnable threads
1023 * and loop or halt as appropriate. Giant is not held on entry to the thread.
1025 * The main loop is entered with a critical section held, we must release
1026 * the critical section before doing anything else. lwkt_switch() will
1027 * check for pending interrupts due to entering and exiting its own
1030 * NOTE: On an SMP system we rely on a scheduler IPI to wake a HLTed cpu up.
1031 * However, there are cases where the idlethread will be entered with
1032 * the possibility that no IPI will occur and in such cases
1033 * lwkt_switch() sets TDF_IDLE_NOHLT.
1035 * NOTE: cpu_idle_repeat determines how many entries into the idle thread
1036 * must occur before it starts using ACPI halt.
1038 static int cpu_idle_hlt = 2;
1039 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
1040 &cpu_idle_hlt, 0, "Idle loop HLT enable");
1041 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_repeat, CTLFLAG_RW,
1042 &cpu_idle_repeat, 0, "Idle entries before acpi hlt");
1044 SYSCTL_PROC(_machdep, OID_AUTO, cpu_idle_hltcnt, (CTLTYPE_QUAD | CTLFLAG_RW),
1045 0, CPU_IDLE_STAT_HALT, sysctl_cpu_idle_cnt, "Q", "Idle loop entry halts");
1046 SYSCTL_PROC(_machdep, OID_AUTO, cpu_idle_spincnt, (CTLTYPE_QUAD | CTLFLAG_RW),
1047 0, CPU_IDLE_STAT_SPIN, sysctl_cpu_idle_cnt, "Q", "Idle loop entry spins");
1050 cpu_idle_default_hook(void)
1053 * We must guarentee that hlt is exactly the instruction
1054 * following the sti.
1056 __asm __volatile("sti; hlt");
1059 /* Other subsystems (e.g., ACPI) can hook this later. */
1060 void (*cpu_idle_hook)(void) = cpu_idle_default_hook;
1063 cpu_mwait_cx_hint(struct cpu_idle_stat *stat)
1068 if (cpu_mwait_halt >= 0) {
1069 hint = cpu_mwait_halt;
1073 idx = (stat->repeat + stat->repeat_last) >> 1;
1074 if (cpu_mwait_halt == CPU_MWAIT_HINT_AUTODEEP) {
1075 if (idx >= cpu_mwait_deep_hints_cnt)
1076 idx = cpu_mwait_deep_hints_cnt - 1;
1077 hint = cpu_mwait_deep_hints[idx];
1079 if (idx >= cpu_mwait_hints_cnt)
1080 idx = cpu_mwait_hints_cnt - 1;
1081 hint = cpu_mwait_hints[idx];
1084 cx_idx = MWAIT_EAX_TO_CX(hint);
1085 if (cx_idx >= 0 && cx_idx < CPU_MWAIT_CX_MAX)
1086 stat->mwait_cx[cx_idx]++;
1093 globaldata_t gd = mycpu;
1094 struct cpu_idle_stat *stat = &cpu_idle_stats[gd->gd_cpuid];
1095 struct thread *td __debugvar = gd->gd_curthread;
1099 stat->repeat = stat->repeat_last = cpu_idle_repeat_max;
1102 KKASSERT(td->td_critcount == 0);
1105 * See if there are any LWKTs ready to go.
1110 * When halting inside a cli we must check for reqflags
1111 * races, particularly [re]schedule requests. Running
1112 * splz() does the job.
1115 * 0 Never halt, just spin
1117 * 1 Always use HLT (or MONITOR/MWAIT if avail).
1118 * This typically eats more power than the
1121 * 2 Use HLT/MONITOR/MWAIT up to a point and then
1122 * use the ACPI halt (default). This is a hybrid
1123 * approach. See machdep.cpu_idle_repeat.
1125 * 3 Always use the ACPI halt. This typically
1126 * eats the least amount of power but the cpu
1127 * will be slow waking up. Slows down e.g.
1128 * compiles and other pipe/event oriented stuff.
1130 * NOTE: Interrupts are enabled and we are not in a critical
1133 * NOTE: Preemptions do not reset gd_idle_repeat. Also we
1134 * don't bother capping gd_idle_repeat, it is ok if
1137 if (gd->gd_idle_repeat == 0) {
1138 stat->repeat = (stat->repeat + stat->repeat_last) >> 1;
1139 if (stat->repeat > cpu_idle_repeat_max)
1140 stat->repeat = cpu_idle_repeat_max;
1141 stat->repeat_last = 0;
1143 ++stat->repeat_last;
1145 ++gd->gd_idle_repeat;
1146 reqflags = gd->gd_reqflags;
1147 quick = (cpu_idle_hlt == 1) ||
1148 (cpu_idle_hlt < 3 &&
1149 gd->gd_idle_repeat < cpu_idle_repeat);
1151 if (quick && (cpu_mi_feature & CPU_MI_MONITOR) &&
1152 (reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
1154 cpu_mmw_pause_int(&gd->gd_reqflags, reqflags,
1155 cpu_mwait_cx_hint(stat), 0);
1157 } else if (cpu_idle_hlt) {
1158 __asm __volatile("cli");
1160 if ((gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
1162 cpu_idle_default_hook();
1166 __asm __volatile("sti");
1170 __asm __volatile("sti");
1177 * This routine is called if a spinlock has been held through the
1178 * exponential backoff period and is seriously contested. On a real cpu
1182 cpu_spinlock_contested(void)
1188 * Clear registers on exec
1191 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
1193 struct thread *td = curthread;
1194 struct lwp *lp = td->td_lwp;
1195 struct pcb *pcb = td->td_pcb;
1196 struct trapframe *regs = lp->lwp_md.md_regs;
1198 /* was i386_user_cleanup() in NetBSD */
1202 bzero((char *)regs, sizeof(struct trapframe));
1203 regs->tf_rip = entry;
1204 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
1205 regs->tf_rdi = stack; /* argv */
1206 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
1207 regs->tf_ss = _udatasel;
1208 regs->tf_cs = _ucodesel;
1209 regs->tf_rbx = ps_strings;
1212 * Reset the hardware debug registers if they were in use.
1213 * They won't have any meaning for the newly exec'd process.
1215 if (pcb->pcb_flags & PCB_DBREGS) {
1221 pcb->pcb_dr7 = 0; /* JG set bit 10? */
1222 if (pcb == td->td_pcb) {
1224 * Clear the debug registers on the running
1225 * CPU, otherwise they will end up affecting
1226 * the next process we switch to.
1230 pcb->pcb_flags &= ~PCB_DBREGS;
1234 * Initialize the math emulator (if any) for the current process.
1235 * Actually, just clear the bit that says that the emulator has
1236 * been initialized. Initialization is delayed until the process
1237 * traps to the emulator (if it is done at all) mainly because
1238 * emulators don't provide an entry point for initialization.
1240 pcb->pcb_flags &= ~FP_SOFTFP;
1243 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
1244 * gd_npxthread. Otherwise a preemptive interrupt thread
1245 * may panic in npxdna().
1248 load_cr0(rcr0() | CR0_MP);
1251 * NOTE: The MSR values must be correct so we can return to
1252 * userland. gd_user_fs/gs must be correct so the switch
1253 * code knows what the current MSR values are.
1255 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
1256 pcb->pcb_gsbase = 0;
1257 mdcpu->gd_user_fs = 0; /* Cache of current MSR values */
1258 mdcpu->gd_user_gs = 0;
1259 wrmsr(MSR_FSBASE, 0); /* Set MSR values for return to userland */
1260 wrmsr(MSR_KGSBASE, 0);
1262 /* Initialize the npx (if any) for the current process. */
1263 npxinit(__INITIAL_FPUCW__);
1266 pcb->pcb_ds = _udatasel;
1267 pcb->pcb_es = _udatasel;
1268 pcb->pcb_fs = _udatasel;
1269 pcb->pcb_gs = _udatasel;
1278 cr0 |= CR0_NE; /* Done by npxinit() */
1279 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1280 cr0 |= CR0_WP | CR0_AM;
1286 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1289 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1291 if (!error && req->newptr)
1296 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1297 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1299 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1300 CTLFLAG_RW, &disable_rtc_set, 0, "");
1303 SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1304 CTLFLAG_RD, &bootinfo, bootinfo, "");
1307 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1308 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1310 extern u_long bootdev; /* not a cdev_t - encoding is different */
1311 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1312 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
1315 * Initialize 386 and configure to run kernel
1319 * Initialize segments & interrupt table
1323 struct user_segment_descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1324 struct gate_descriptor idt_arr[MAXCPU][NIDT];
1326 union descriptor ldt[NLDT]; /* local descriptor table */
1329 /* table descriptors - used to load tables by cpu */
1330 struct region_descriptor r_gdt;
1331 struct region_descriptor r_idt_arr[MAXCPU];
1333 /* JG proc0paddr is a virtual address */
1336 char proc0paddr_buff[LWKT_THREAD_STACK];
1339 /* software prototypes -- in more palatable form */
1340 struct soft_segment_descriptor gdt_segs[] = {
1341 /* GNULL_SEL 0 Null Descriptor */
1342 { 0x0, /* segment base address */
1344 0, /* segment type */
1345 0, /* segment descriptor priority level */
1346 0, /* segment descriptor present */
1348 0, /* default 32 vs 16 bit size */
1349 0 /* limit granularity (byte/page units)*/ },
1350 /* GCODE_SEL 1 Code Descriptor for kernel */
1351 { 0x0, /* segment base address */
1352 0xfffff, /* length - all address space */
1353 SDT_MEMERA, /* segment type */
1354 SEL_KPL, /* segment descriptor priority level */
1355 1, /* segment descriptor present */
1357 0, /* default 32 vs 16 bit size */
1358 1 /* limit granularity (byte/page units)*/ },
1359 /* GDATA_SEL 2 Data Descriptor for kernel */
1360 { 0x0, /* segment base address */
1361 0xfffff, /* length - all address space */
1362 SDT_MEMRWA, /* segment type */
1363 SEL_KPL, /* segment descriptor priority level */
1364 1, /* segment descriptor present */
1366 0, /* default 32 vs 16 bit size */
1367 1 /* limit granularity (byte/page units)*/ },
1368 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
1369 { 0x0, /* segment base address */
1370 0xfffff, /* length - all address space */
1371 SDT_MEMERA, /* segment type */
1372 SEL_UPL, /* segment descriptor priority level */
1373 1, /* segment descriptor present */
1375 1, /* default 32 vs 16 bit size */
1376 1 /* limit granularity (byte/page units)*/ },
1377 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
1378 { 0x0, /* segment base address */
1379 0xfffff, /* length - all address space */
1380 SDT_MEMRWA, /* segment type */
1381 SEL_UPL, /* segment descriptor priority level */
1382 1, /* segment descriptor present */
1384 1, /* default 32 vs 16 bit size */
1385 1 /* limit granularity (byte/page units)*/ },
1386 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
1387 { 0x0, /* segment base address */
1388 0xfffff, /* length - all address space */
1389 SDT_MEMERA, /* segment type */
1390 SEL_UPL, /* segment descriptor priority level */
1391 1, /* segment descriptor present */
1393 0, /* default 32 vs 16 bit size */
1394 1 /* limit granularity (byte/page units)*/ },
1395 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
1397 0x0, /* segment base address */
1398 sizeof(struct x86_64tss)-1,/* length - all address space */
1399 SDT_SYSTSS, /* segment type */
1400 SEL_KPL, /* segment descriptor priority level */
1401 1, /* segment descriptor present */
1403 0, /* unused - default 32 vs 16 bit size */
1404 0 /* limit granularity (byte/page units)*/ },
1405 /* Actually, the TSS is a system descriptor which is double size */
1406 { 0x0, /* segment base address */
1408 0, /* segment type */
1409 0, /* segment descriptor priority level */
1410 0, /* segment descriptor present */
1412 0, /* default 32 vs 16 bit size */
1413 0 /* limit granularity (byte/page units)*/ },
1414 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
1415 { 0x0, /* segment base address */
1416 0xfffff, /* length - all address space */
1417 SDT_MEMRWA, /* segment type */
1418 SEL_UPL, /* segment descriptor priority level */
1419 1, /* segment descriptor present */
1421 1, /* default 32 vs 16 bit size */
1422 1 /* limit granularity (byte/page units)*/ },
1426 setidt_global(int idx, inthand_t *func, int typ, int dpl, int ist)
1430 for (cpu = 0; cpu < MAXCPU; ++cpu) {
1431 struct gate_descriptor *ip = &idt_arr[cpu][idx];
1433 ip->gd_looffset = (uintptr_t)func;
1434 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1440 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1445 setidt(int idx, inthand_t *func, int typ, int dpl, int ist, int cpu)
1447 struct gate_descriptor *ip;
1449 KASSERT(cpu >= 0 && cpu < ncpus, ("invalid cpu %d", cpu));
1451 ip = &idt_arr[cpu][idx];
1452 ip->gd_looffset = (uintptr_t)func;
1453 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1459 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1462 #define IDTVEC(name) __CONCAT(X,name)
1465 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1466 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1467 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1468 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1469 IDTVEC(xmm), IDTVEC(dblfault),
1470 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1472 #ifdef DEBUG_INTERRUPTS
1473 extern inthand_t *Xrsvdary[256];
1477 sdtossd(struct user_segment_descriptor *sd, struct soft_segment_descriptor *ssd)
1479 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1480 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1481 ssd->ssd_type = sd->sd_type;
1482 ssd->ssd_dpl = sd->sd_dpl;
1483 ssd->ssd_p = sd->sd_p;
1484 ssd->ssd_def32 = sd->sd_def32;
1485 ssd->ssd_gran = sd->sd_gran;
1489 ssdtosd(struct soft_segment_descriptor *ssd, struct user_segment_descriptor *sd)
1492 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1493 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1494 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1495 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1496 sd->sd_type = ssd->ssd_type;
1497 sd->sd_dpl = ssd->ssd_dpl;
1498 sd->sd_p = ssd->ssd_p;
1499 sd->sd_long = ssd->ssd_long;
1500 sd->sd_def32 = ssd->ssd_def32;
1501 sd->sd_gran = ssd->ssd_gran;
1505 ssdtosyssd(struct soft_segment_descriptor *ssd,
1506 struct system_segment_descriptor *sd)
1509 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1510 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1511 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1512 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1513 sd->sd_type = ssd->ssd_type;
1514 sd->sd_dpl = ssd->ssd_dpl;
1515 sd->sd_p = ssd->ssd_p;
1516 sd->sd_gran = ssd->ssd_gran;
1520 * Populate the (physmap) array with base/bound pairs describing the
1521 * available physical memory in the system, then test this memory and
1522 * build the phys_avail array describing the actually-available memory.
1524 * If we cannot accurately determine the physical memory map, then use
1525 * value from the 0xE801 call, and failing that, the RTC.
1527 * Total memory size may be set by the kernel environment variable
1528 * hw.physmem or the compile-time define MAXMEM.
1530 * Memory is aligned to PHYSMAP_ALIGN which must be a multiple
1531 * of PAGE_SIZE. This also greatly reduces the memory test time
1532 * which would otherwise be excessive on machines with > 8G of ram.
1534 * XXX first should be vm_paddr_t.
1537 #define PHYSMAP_ALIGN (vm_paddr_t)(128 * 1024)
1538 #define PHYSMAP_ALIGN_MASK (vm_paddr_t)(PHYSMAP_ALIGN - 1)
1541 getmemsize(caddr_t kmdp, u_int64_t first)
1543 int off, physmap_idx, pa_indx, da_indx;
1545 vm_paddr_t physmap[PHYSMAP_SIZE];
1547 vm_paddr_t msgbuf_size;
1548 u_long physmem_tunable;
1550 struct bios_smap *smapbase, *smap, *smapend;
1552 quad_t dcons_addr, dcons_size;
1554 bzero(physmap, sizeof(physmap));
1558 * get memory map from INT 15:E820, kindly supplied by the loader.
1560 * subr_module.c says:
1561 * "Consumer may safely assume that size value precedes data."
1562 * ie: an int32_t immediately precedes smap.
1564 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1565 MODINFO_METADATA | MODINFOMD_SMAP);
1566 if (smapbase == NULL)
1567 panic("No BIOS smap info from loader!");
1569 smapsize = *((u_int32_t *)smapbase - 1);
1570 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1572 for (smap = smapbase; smap < smapend; smap++) {
1573 if (boothowto & RB_VERBOSE)
1574 kprintf("SMAP type=%02x base=%016lx len=%016lx\n",
1575 smap->type, smap->base, smap->length);
1577 if (smap->type != SMAP_TYPE_MEMORY)
1580 if (smap->length == 0)
1583 for (i = 0; i <= physmap_idx; i += 2) {
1584 if (smap->base < physmap[i + 1]) {
1585 if (boothowto & RB_VERBOSE) {
1586 kprintf("Overlapping or non-monotonic "
1587 "memory region, ignoring "
1593 if (i <= physmap_idx)
1596 Realmem += smap->length;
1598 if (smap->base == physmap[physmap_idx + 1]) {
1599 physmap[physmap_idx + 1] += smap->length;
1604 if (physmap_idx == PHYSMAP_SIZE) {
1605 kprintf("Too many segments in the physical "
1606 "address map, giving up\n");
1609 physmap[physmap_idx] = smap->base;
1610 physmap[physmap_idx + 1] = smap->base + smap->length;
1613 base_memory = physmap[1] / 1024;
1614 /* make hole for AP bootstrap code */
1615 physmap[1] = mp_bootaddress(base_memory);
1617 /* Save EBDA address, if any */
1618 ebda_addr = (u_long)(*(u_short *)(KERNBASE + 0x40e));
1622 * Maxmem isn't the "maximum memory", it's one larger than the
1623 * highest page of the physical address space. It should be
1624 * called something like "Maxphyspage". We may adjust this
1625 * based on ``hw.physmem'' and the results of the memory test.
1627 Maxmem = atop(physmap[physmap_idx + 1]);
1630 Maxmem = MAXMEM / 4;
1633 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1634 Maxmem = atop(physmem_tunable);
1637 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1640 if (Maxmem > atop(physmap[physmap_idx + 1]))
1641 Maxmem = atop(physmap[physmap_idx + 1]);
1644 * Blowing out the DMAP will blow up the system.
1646 if (Maxmem > atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)) {
1647 kprintf("Limiting Maxmem due to DMAP size\n");
1648 Maxmem = atop(DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS);
1651 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1652 (boothowto & RB_VERBOSE)) {
1653 kprintf("Physical memory use set to %ldK\n", Maxmem * 4);
1657 * Call pmap initialization to make new kernel address space
1661 pmap_bootstrap(&first);
1662 physmap[0] = PAGE_SIZE;
1665 * Align the physmap to PHYSMAP_ALIGN and cut out anything
1668 for (i = j = 0; i <= physmap_idx; i += 2) {
1669 if (physmap[i+1] > ptoa(Maxmem))
1670 physmap[i+1] = ptoa(Maxmem);
1671 physmap[i] = (physmap[i] + PHYSMAP_ALIGN_MASK) &
1672 ~PHYSMAP_ALIGN_MASK;
1673 physmap[i+1] = physmap[i+1] & ~PHYSMAP_ALIGN_MASK;
1675 physmap[j] = physmap[i];
1676 physmap[j+1] = physmap[i+1];
1678 if (physmap[i] < physmap[i+1])
1681 physmap_idx = j - 2;
1684 * Align anything else used in the validation loop.
1686 first = (first + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
1689 * Size up each available chunk of physical memory.
1693 phys_avail[pa_indx++] = physmap[0];
1694 phys_avail[pa_indx] = physmap[0];
1695 dump_avail[da_indx] = physmap[0];
1699 * Get dcons buffer address
1701 if (kgetenv_quad("dcons.addr", &dcons_addr) == 0 ||
1702 kgetenv_quad("dcons.size", &dcons_size) == 0)
1706 * Validate the physical memory. The physical memory segments
1707 * have already been aligned to PHYSMAP_ALIGN which is a multiple
1710 for (i = 0; i <= physmap_idx; i += 2) {
1713 end = physmap[i + 1];
1715 for (pa = physmap[i]; pa < end; pa += PHYSMAP_ALIGN) {
1716 int tmp, page_bad, full;
1717 int *ptr = (int *)CADDR1;
1721 * block out kernel memory as not available.
1723 if (pa >= 0x200000 && pa < first)
1727 * block out dcons buffer
1730 && pa >= trunc_page(dcons_addr)
1731 && pa < dcons_addr + dcons_size) {
1738 * map page into kernel: valid, read/write,non-cacheable
1741 kernel_pmap.pmap_bits[PG_V_IDX] |
1742 kernel_pmap.pmap_bits[PG_RW_IDX] |
1743 kernel_pmap.pmap_bits[PG_N_IDX];
1748 * Test for alternating 1's and 0's
1750 *(volatile int *)ptr = 0xaaaaaaaa;
1752 if (*(volatile int *)ptr != 0xaaaaaaaa)
1755 * Test for alternating 0's and 1's
1757 *(volatile int *)ptr = 0x55555555;
1759 if (*(volatile int *)ptr != 0x55555555)
1764 *(volatile int *)ptr = 0xffffffff;
1766 if (*(volatile int *)ptr != 0xffffffff)
1771 *(volatile int *)ptr = 0x0;
1773 if (*(volatile int *)ptr != 0x0)
1776 * Restore original value.
1781 * Adjust array of valid/good pages.
1783 if (page_bad == TRUE)
1786 * If this good page is a continuation of the
1787 * previous set of good pages, then just increase
1788 * the end pointer. Otherwise start a new chunk.
1789 * Note that "end" points one higher than end,
1790 * making the range >= start and < end.
1791 * If we're also doing a speculative memory
1792 * test and we at or past the end, bump up Maxmem
1793 * so that we keep going. The first bad page
1794 * will terminate the loop.
1796 if (phys_avail[pa_indx] == pa) {
1797 phys_avail[pa_indx] += PHYSMAP_ALIGN;
1800 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1802 "Too many holes in the physical address space, giving up\n");
1807 phys_avail[pa_indx++] = pa;
1808 phys_avail[pa_indx] = pa + PHYSMAP_ALIGN;
1810 physmem += PHYSMAP_ALIGN / PAGE_SIZE;
1812 if (dump_avail[da_indx] == pa) {
1813 dump_avail[da_indx] += PHYSMAP_ALIGN;
1816 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1820 dump_avail[da_indx++] = pa;
1821 dump_avail[da_indx] = pa + PHYSMAP_ALIGN;
1832 * The last chunk must contain at least one page plus the message
1833 * buffer to avoid complicating other code (message buffer address
1834 * calculation, etc.).
1836 msgbuf_size = (MSGBUF_SIZE + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
1838 while (phys_avail[pa_indx - 1] + PHYSMAP_ALIGN +
1839 msgbuf_size >= phys_avail[pa_indx]) {
1840 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1841 phys_avail[pa_indx--] = 0;
1842 phys_avail[pa_indx--] = 0;
1845 Maxmem = atop(phys_avail[pa_indx]);
1847 /* Trim off space for the message buffer. */
1848 phys_avail[pa_indx] -= msgbuf_size;
1850 avail_end = phys_avail[pa_indx];
1852 /* Map the message buffer. */
1853 for (off = 0; off < msgbuf_size; off += PAGE_SIZE) {
1854 pmap_kenter((vm_offset_t)msgbufp + off,
1855 phys_avail[pa_indx] + off);
1859 struct machintr_abi MachIntrABI;
1870 * 7 Device Not Available (x87)
1872 * 9 Coprocessor Segment overrun (unsupported, reserved)
1874 * 11 Segment not present
1876 * 13 General Protection
1879 * 16 x87 FP Exception pending
1880 * 17 Alignment Check
1882 * 19 SIMD floating point
1884 * 32-255 INTn/external sources
1887 hammer_time(u_int64_t modulep, u_int64_t physfree)
1890 int gsel_tss, x, cpu;
1892 int metadata_missing, off;
1894 struct mdglobaldata *gd;
1898 * Prevent lowering of the ipl if we call tsleep() early.
1900 gd = &CPU_prvspace[0].mdglobaldata;
1901 bzero(gd, sizeof(*gd));
1904 * Note: on both UP and SMP curthread must be set non-NULL
1905 * early in the boot sequence because the system assumes
1906 * that 'curthread' is never NULL.
1909 gd->mi.gd_curthread = &thread0;
1910 thread0.td_gd = &gd->mi;
1912 atdevbase = ISA_HOLE_START + PTOV_OFFSET;
1915 metadata_missing = 0;
1916 if (bootinfo.bi_modulep) {
1917 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1918 preload_bootstrap_relocate(KERNBASE);
1920 metadata_missing = 1;
1922 if (bootinfo.bi_envp)
1923 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1926 preload_metadata = (caddr_t)(uintptr_t)(modulep + PTOV_OFFSET);
1927 preload_bootstrap_relocate(PTOV_OFFSET);
1928 kmdp = preload_search_by_type("elf kernel");
1930 kmdp = preload_search_by_type("elf64 kernel");
1931 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1932 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + PTOV_OFFSET;
1934 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1935 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1938 if (boothowto & RB_VERBOSE)
1942 * Default MachIntrABI to ICU
1944 MachIntrABI = MachIntrABI_ICU;
1947 * start with one cpu. Note: with one cpu, ncpus2_shift, ncpus2_mask,
1948 * and ncpus_fit_mask remain 0.
1953 /* Init basic tunables, hz etc */
1957 * make gdt memory segments
1959 gdt_segs[GPROC0_SEL].ssd_base =
1960 (uintptr_t) &CPU_prvspace[0].mdglobaldata.gd_common_tss;
1962 gd->mi.gd_prvspace = &CPU_prvspace[0];
1964 for (x = 0; x < NGDT; x++) {
1965 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1966 ssdtosd(&gdt_segs[x], &gdt[x]);
1968 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1969 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1971 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1972 r_gdt.rd_base = (long) gdt;
1975 wrmsr(MSR_FSBASE, 0); /* User value */
1976 wrmsr(MSR_GSBASE, (u_int64_t)&gd->mi);
1977 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1979 mi_gdinit(&gd->mi, 0);
1981 proc0paddr = proc0paddr_buff;
1982 mi_proc0init(&gd->mi, proc0paddr);
1983 safepri = TDPRI_MAX;
1985 /* spinlocks and the BGL */
1989 for (x = 0; x < NIDT; x++)
1990 setidt_global(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1991 setidt_global(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1992 setidt_global(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1993 setidt_global(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1994 setidt_global(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1995 setidt_global(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1996 setidt_global(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1997 setidt_global(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1998 setidt_global(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1999 setidt_global(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
2000 setidt_global(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
2001 setidt_global(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
2002 setidt_global(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
2003 setidt_global(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
2004 setidt_global(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
2005 setidt_global(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
2006 setidt_global(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
2007 setidt_global(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
2008 setidt_global(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
2009 setidt_global(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
2011 for (cpu = 0; cpu < MAXCPU; ++cpu) {
2012 r_idt_arr[cpu].rd_limit = sizeof(idt_arr[cpu]) - 1;
2013 r_idt_arr[cpu].rd_base = (long) &idt_arr[cpu][0];
2016 lidt(&r_idt_arr[0]);
2019 * Initialize the console before we print anything out.
2024 if (metadata_missing)
2025 kprintf("WARNING: loader(8) metadata is missing!\n");
2035 * Initialize IRQ mapping
2038 * SHOULD be after elcr_probe()
2040 MachIntrABI_ICU.initmap();
2041 MachIntrABI_IOAPIC.initmap();
2045 if (boothowto & RB_KDB)
2046 Debugger("Boot flags requested debugger");
2050 finishidentcpu(); /* Final stage of CPU initialization */
2051 setidt(6, &IDTVEC(ill), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2052 setidt(13, &IDTVEC(prot), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
2054 identify_cpu(); /* Final stage of CPU initialization */
2055 initializecpu(0); /* Initialize CPU registers */
2057 TUNABLE_INT_FETCH("hw.apic_io_enable", &ioapic_enable); /* for compat */
2058 TUNABLE_INT_FETCH("hw.ioapic_enable", &ioapic_enable);
2059 TUNABLE_INT_FETCH("hw.lapic_enable", &lapic_enable);
2062 * Some of the virtual machines do not work w/ I/O APIC
2063 * enabled. If the user does not explicitly enable or
2064 * disable the I/O APIC (ioapic_enable < 0), then we
2065 * disable I/O APIC on all virtual machines.
2068 * This must be done after identify_cpu(), which sets
2071 if (ioapic_enable < 0) {
2072 if (cpu_feature2 & CPUID2_VMM)
2078 /* make an initial tss so cpu can get interrupt stack on syscall! */
2079 gd->gd_common_tss.tss_rsp0 =
2080 (register_t)(thread0.td_kstack +
2081 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb));
2082 /* Ensure the stack is aligned to 16 bytes */
2083 gd->gd_common_tss.tss_rsp0 &= ~(register_t)0xF;
2085 /* double fault stack */
2086 gd->gd_common_tss.tss_ist1 =
2087 (long)&gd->mi.gd_prvspace->idlestack[
2088 sizeof(gd->mi.gd_prvspace->idlestack)];
2090 /* Set the IO permission bitmap (empty due to tss seg limit) */
2091 gd->gd_common_tss.tss_iobase = sizeof(struct x86_64tss);
2093 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
2094 gd->gd_tss_gdt = &gdt[GPROC0_SEL];
2095 gd->gd_common_tssd = *gd->gd_tss_gdt;
2098 /* Set up the fast syscall stuff */
2099 msr = rdmsr(MSR_EFER) | EFER_SCE;
2100 wrmsr(MSR_EFER, msr);
2101 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
2102 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
2103 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
2104 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
2105 wrmsr(MSR_STAR, msr);
2106 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D|PSL_IOPL);
2108 getmemsize(kmdp, physfree);
2109 init_param2(physmem);
2111 /* now running on new page tables, configured,and u/iom is accessible */
2113 /* Map the message buffer. */
2115 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2116 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2119 msgbufinit(msgbufp, MSGBUF_SIZE);
2122 /* transfer to user mode */
2124 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
2125 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
2126 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
2132 /* setup proc 0's pcb */
2133 thread0.td_pcb->pcb_flags = 0;
2134 thread0.td_pcb->pcb_cr3 = KPML4phys;
2135 thread0.td_pcb->pcb_ext = NULL;
2136 lwp0.lwp_md.md_regs = &proc0_tf; /* XXX needed? */
2138 /* Location of kernel stack for locore */
2139 return ((u_int64_t)thread0.td_pcb);
2143 * Initialize machine-dependant portions of the global data structure.
2144 * Note that the global data area and cpu0's idlestack in the private
2145 * data space were allocated in locore.
2147 * Note: the idlethread's cpl is 0
2149 * WARNING! Called from early boot, 'mycpu' may not work yet.
2152 cpu_gdinit(struct mdglobaldata *gd, int cpu)
2155 gd->mi.gd_curthread = &gd->mi.gd_idlethread;
2157 lwkt_init_thread(&gd->mi.gd_idlethread,
2158 gd->mi.gd_prvspace->idlestack,
2159 sizeof(gd->mi.gd_prvspace->idlestack),
2161 lwkt_set_comm(&gd->mi.gd_idlethread, "idle_%d", cpu);
2162 gd->mi.gd_idlethread.td_switch = cpu_lwkt_switch;
2163 gd->mi.gd_idlethread.td_sp -= sizeof(void *);
2164 *(void **)gd->mi.gd_idlethread.td_sp = cpu_idle_restore;
2168 is_globaldata_space(vm_offset_t saddr, vm_offset_t eaddr)
2170 if (saddr >= (vm_offset_t)&CPU_prvspace[0] &&
2171 eaddr <= (vm_offset_t)&CPU_prvspace[MAXCPU]) {
2174 if (saddr >= DMAP_MIN_ADDRESS && eaddr <= DMAP_MAX_ADDRESS)
2180 globaldata_find(int cpu)
2182 KKASSERT(cpu >= 0 && cpu < ncpus);
2183 return(&CPU_prvspace[cpu].mdglobaldata.mi);
2187 ptrace_set_pc(struct lwp *lp, unsigned long addr)
2189 lp->lwp_md.md_regs->tf_rip = addr;
2194 ptrace_single_step(struct lwp *lp)
2196 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
2201 fill_regs(struct lwp *lp, struct reg *regs)
2203 struct trapframe *tp;
2205 if ((tp = lp->lwp_md.md_regs) == NULL)
2207 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
2212 set_regs(struct lwp *lp, struct reg *regs)
2214 struct trapframe *tp;
2216 tp = lp->lwp_md.md_regs;
2217 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
2218 !CS_SECURE(regs->r_cs))
2220 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
2225 #ifndef CPU_DISABLE_SSE
2227 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
2229 struct env87 *penv_87 = &sv_87->sv_env;
2230 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2233 /* FPU control/status */
2234 penv_87->en_cw = penv_xmm->en_cw;
2235 penv_87->en_sw = penv_xmm->en_sw;
2236 penv_87->en_tw = penv_xmm->en_tw;
2237 penv_87->en_fip = penv_xmm->en_fip;
2238 penv_87->en_fcs = penv_xmm->en_fcs;
2239 penv_87->en_opcode = penv_xmm->en_opcode;
2240 penv_87->en_foo = penv_xmm->en_foo;
2241 penv_87->en_fos = penv_xmm->en_fos;
2244 for (i = 0; i < 8; ++i)
2245 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2249 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
2251 struct env87 *penv_87 = &sv_87->sv_env;
2252 struct envxmm *penv_xmm = &sv_xmm->sv_env;
2255 /* FPU control/status */
2256 penv_xmm->en_cw = penv_87->en_cw;
2257 penv_xmm->en_sw = penv_87->en_sw;
2258 penv_xmm->en_tw = penv_87->en_tw;
2259 penv_xmm->en_fip = penv_87->en_fip;
2260 penv_xmm->en_fcs = penv_87->en_fcs;
2261 penv_xmm->en_opcode = penv_87->en_opcode;
2262 penv_xmm->en_foo = penv_87->en_foo;
2263 penv_xmm->en_fos = penv_87->en_fos;
2266 for (i = 0; i < 8; ++i)
2267 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2269 #endif /* CPU_DISABLE_SSE */
2272 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
2274 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL)
2276 #ifndef CPU_DISABLE_SSE
2278 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
2279 (struct save87 *)fpregs);
2282 #endif /* CPU_DISABLE_SSE */
2283 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
2288 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
2290 #ifndef CPU_DISABLE_SSE
2292 set_fpregs_xmm((struct save87 *)fpregs,
2293 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
2296 #endif /* CPU_DISABLE_SSE */
2297 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
2302 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
2307 dbregs->dr[0] = rdr0();
2308 dbregs->dr[1] = rdr1();
2309 dbregs->dr[2] = rdr2();
2310 dbregs->dr[3] = rdr3();
2311 dbregs->dr[4] = rdr4();
2312 dbregs->dr[5] = rdr5();
2313 dbregs->dr[6] = rdr6();
2314 dbregs->dr[7] = rdr7();
2317 if (lp->lwp_thread == NULL || (pcb = lp->lwp_thread->td_pcb) == NULL)
2319 dbregs->dr[0] = pcb->pcb_dr0;
2320 dbregs->dr[1] = pcb->pcb_dr1;
2321 dbregs->dr[2] = pcb->pcb_dr2;
2322 dbregs->dr[3] = pcb->pcb_dr3;
2325 dbregs->dr[6] = pcb->pcb_dr6;
2326 dbregs->dr[7] = pcb->pcb_dr7;
2331 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
2334 load_dr0(dbregs->dr[0]);
2335 load_dr1(dbregs->dr[1]);
2336 load_dr2(dbregs->dr[2]);
2337 load_dr3(dbregs->dr[3]);
2338 load_dr4(dbregs->dr[4]);
2339 load_dr5(dbregs->dr[5]);
2340 load_dr6(dbregs->dr[6]);
2341 load_dr7(dbregs->dr[7]);
2344 struct ucred *ucred;
2346 uint64_t mask1, mask2;
2349 * Don't let an illegal value for dr7 get set. Specifically,
2350 * check for undefined settings. Setting these bit patterns
2351 * result in undefined behaviour and can lead to an unexpected
2354 /* JG this loop looks unreadable */
2355 /* Check 4 2-bit fields for invalid patterns.
2356 * These fields are R/Wi, for i = 0..3
2358 /* Is 10 in LENi allowed when running in compatibility mode? */
2359 /* Pattern 10 in R/Wi might be used to indicate
2360 * breakpoint on I/O. Further analysis should be
2361 * carried to decide if it is safe and useful to
2362 * provide access to that capability
2364 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 4;
2365 i++, mask1 <<= 4, mask2 <<= 4)
2366 if ((dbregs->dr[7] & mask1) == mask2)
2369 pcb = lp->lwp_thread->td_pcb;
2370 ucred = lp->lwp_proc->p_ucred;
2373 * Don't let a process set a breakpoint that is not within the
2374 * process's address space. If a process could do this, it
2375 * could halt the system by setting a breakpoint in the kernel
2376 * (if ddb was enabled). Thus, we need to check to make sure
2377 * that no breakpoints are being enabled for addresses outside
2378 * process's address space, unless, perhaps, we were called by
2381 * XXX - what about when the watched area of the user's
2382 * address space is written into from within the kernel
2383 * ... wouldn't that still cause a breakpoint to be generated
2384 * from within kernel mode?
2387 if (priv_check_cred(ucred, PRIV_ROOT, 0) != 0) {
2388 if (dbregs->dr[7] & 0x3) {
2389 /* dr0 is enabled */
2390 if (dbregs->dr[0] >= VM_MAX_USER_ADDRESS)
2394 if (dbregs->dr[7] & (0x3<<2)) {
2395 /* dr1 is enabled */
2396 if (dbregs->dr[1] >= VM_MAX_USER_ADDRESS)
2400 if (dbregs->dr[7] & (0x3<<4)) {
2401 /* dr2 is enabled */
2402 if (dbregs->dr[2] >= VM_MAX_USER_ADDRESS)
2406 if (dbregs->dr[7] & (0x3<<6)) {
2407 /* dr3 is enabled */
2408 if (dbregs->dr[3] >= VM_MAX_USER_ADDRESS)
2413 pcb->pcb_dr0 = dbregs->dr[0];
2414 pcb->pcb_dr1 = dbregs->dr[1];
2415 pcb->pcb_dr2 = dbregs->dr[2];
2416 pcb->pcb_dr3 = dbregs->dr[3];
2417 pcb->pcb_dr6 = dbregs->dr[6];
2418 pcb->pcb_dr7 = dbregs->dr[7];
2420 pcb->pcb_flags |= PCB_DBREGS;
2427 * Return > 0 if a hardware breakpoint has been hit, and the
2428 * breakpoint was in user space. Return 0, otherwise.
2431 user_dbreg_trap(void)
2433 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2434 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2435 int nbp; /* number of breakpoints that triggered */
2436 caddr_t addr[4]; /* breakpoint addresses */
2440 if ((dr7 & 0xff) == 0) {
2442 * all GE and LE bits in the dr7 register are zero,
2443 * thus the trap couldn't have been caused by the
2444 * hardware debug registers
2455 * None of the breakpoint bits are set meaning this
2456 * trap was not caused by any of the debug registers
2462 * at least one of the breakpoints were hit, check to see
2463 * which ones and if any of them are user space addresses
2467 addr[nbp++] = (caddr_t)rdr0();
2470 addr[nbp++] = (caddr_t)rdr1();
2473 addr[nbp++] = (caddr_t)rdr2();
2476 addr[nbp++] = (caddr_t)rdr3();
2479 for (i=0; i<nbp; i++) {
2481 (caddr_t)VM_MAX_USER_ADDRESS) {
2483 * addr[i] is in user space
2490 * None of the breakpoints are in user space.
2498 Debugger(const char *msg)
2500 kprintf("Debugger(\"%s\") called.\n", msg);
2507 * Provide inb() and outb() as functions. They are normally only
2508 * available as macros calling inlined functions, thus cannot be
2509 * called inside DDB.
2511 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2517 /* silence compiler warnings */
2519 void outb(u_int, u_char);
2526 * We use %%dx and not %1 here because i/o is done at %dx and not at
2527 * %edx, while gcc generates inferior code (movw instead of movl)
2528 * if we tell it to load (u_short) port.
2530 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2535 outb(u_int port, u_char data)
2539 * Use an unnecessary assignment to help gcc's register allocator.
2540 * This make a large difference for gcc-1.40 and a tiny difference
2541 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2542 * best results. gcc-2.6.0 can't handle this.
2545 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2553 * initialize all the SMP locks
2556 /* critical region when masking or unmasking interupts */
2557 struct spinlock_deprecated imen_spinlock;
2559 /* critical region for old style disable_intr/enable_intr */
2560 struct spinlock_deprecated mpintr_spinlock;
2562 /* critical region around INTR() routines */
2563 struct spinlock_deprecated intr_spinlock;
2565 /* lock region used by kernel profiling */
2566 struct spinlock_deprecated mcount_spinlock;
2568 /* locks com (tty) data/hardware accesses: a FASTINTR() */
2569 struct spinlock_deprecated com_spinlock;
2571 /* lock regions around the clock hardware */
2572 struct spinlock_deprecated clock_spinlock;
2578 * Get the initial mplock with a count of 1 for the BSP.
2579 * This uses a LOGICAL cpu ID, ie BSP == 0.
2581 cpu_get_initial_mplock();
2583 spin_lock_init(&mcount_spinlock);
2584 spin_lock_init(&intr_spinlock);
2585 spin_lock_init(&mpintr_spinlock);
2586 spin_lock_init(&imen_spinlock);
2587 spin_lock_init(&com_spinlock);
2588 spin_lock_init(&clock_spinlock);
2590 /* our token pool needs to work early */
2591 lwkt_token_pool_init();
2595 cpu_mwait_hint_valid(uint32_t hint)
2599 cx_idx = MWAIT_EAX_TO_CX(hint);
2600 if (cx_idx >= CPU_MWAIT_CX_MAX)
2603 sub = MWAIT_EAX_TO_CX_SUB(hint);
2604 if (sub >= cpu_mwait_cx_info[cx_idx].subcnt)
2611 cpu_mwait_cx_no_bmsts(void)
2613 atomic_clear_int(&cpu_mwait_c3_preamble, CPU_MWAIT_C3_PREAMBLE_BM_STS);
2617 cpu_mwait_cx_select_sysctl(SYSCTL_HANDLER_ARGS, int *hint0,
2618 boolean_t allow_auto)
2620 int error, cx_idx, old_cx_idx, sub = 0, hint;
2621 char name[16], *ptr, *start;
2625 old_cx_idx = MWAIT_EAX_TO_CX(hint);
2626 sub = MWAIT_EAX_TO_CX_SUB(hint);
2627 } else if (hint == CPU_MWAIT_HINT_AUTO) {
2628 old_cx_idx = allow_auto ? CPU_MWAIT_C2 : CPU_MWAIT_CX_MAX;
2629 } else if (hint == CPU_MWAIT_HINT_AUTODEEP) {
2630 old_cx_idx = allow_auto ? CPU_MWAIT_C3 : CPU_MWAIT_CX_MAX;
2632 old_cx_idx = CPU_MWAIT_CX_MAX;
2635 if ((cpu_feature2 & CPUID2_MON) == 0 ||
2636 (cpu_mwait_feature & CPUID_MWAIT_EXT) == 0)
2637 strlcpy(name, "NONE", sizeof(name));
2638 else if (allow_auto && hint == CPU_MWAIT_HINT_AUTO)
2639 strlcpy(name, "AUTO", sizeof(name));
2640 else if (allow_auto && hint == CPU_MWAIT_HINT_AUTODEEP)
2641 strlcpy(name, "AUTODEEP", sizeof(name));
2642 else if (old_cx_idx >= CPU_MWAIT_CX_MAX ||
2643 sub >= cpu_mwait_cx_info[old_cx_idx].subcnt)
2644 strlcpy(name, "INVALID", sizeof(name));
2646 ksnprintf(name, sizeof(name), "C%d/%d", old_cx_idx, sub);
2648 error = sysctl_handle_string(oidp, name, sizeof(name), req);
2649 if (error != 0 || req->newptr == NULL)
2652 if ((cpu_feature2 & CPUID2_MON) == 0 ||
2653 (cpu_mwait_feature & CPUID_MWAIT_EXT) == 0)
2656 if (allow_auto && strcmp(name, "AUTO") == 0) {
2657 hint = CPU_MWAIT_HINT_AUTO;
2658 cx_idx = CPU_MWAIT_C2;
2661 if (allow_auto && strcmp(name, "AUTODEEP") == 0) {
2662 hint = CPU_MWAIT_HINT_AUTODEEP;
2663 cx_idx = CPU_MWAIT_C3;
2667 if (strlen(name) < 4 || toupper(name[0]) != 'C')
2672 cx_idx = strtol(start, &ptr, 10);
2673 if (ptr == start || *ptr != '/')
2675 if (cx_idx < 0 || cx_idx >= CPU_MWAIT_CX_MAX)
2681 sub = strtol(start, &ptr, 10);
2684 if (sub < 0 || sub >= cpu_mwait_cx_info[cx_idx].subcnt)
2687 hint = MWAIT_EAX_HINT(cx_idx, sub);
2689 if (cx_idx >= CPU_MWAIT_C3 && cpu_mwait_c3_preamble)
2691 if (old_cx_idx < CPU_MWAIT_C3 && cx_idx >= CPU_MWAIT_C3) {
2692 error = cputimer_intr_powersave_addreq();
2695 } else if (old_cx_idx >= CPU_MWAIT_C3 && cx_idx < CPU_MWAIT_C3) {
2696 cputimer_intr_powersave_remreq();
2704 cpu_mwait_cx_idle_sysctl(SYSCTL_HANDLER_ARGS)
2708 lwkt_serialize_enter(&cpu_mwait_cx_slize);
2709 error = cpu_mwait_cx_select_sysctl(oidp, arg1, arg2, req,
2710 &cpu_mwait_halt, TRUE);
2711 lwkt_serialize_exit(&cpu_mwait_cx_slize);
2716 cpu_mwait_cx_spin_sysctl(SYSCTL_HANDLER_ARGS)
2720 lwkt_serialize_enter(&cpu_mwait_cx_slize);
2721 error = cpu_mwait_cx_select_sysctl(oidp, arg1, arg2, req,
2722 &cpu_mwait_spin, FALSE);
2723 lwkt_serialize_exit(&cpu_mwait_cx_slize);