1 /*-
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.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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.
25 *
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
36 * SUCH DAMAGE.
37 *
38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
39 */
40
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 #include "opt_atalk.h"
45 #include "opt_atpic.h"
46 #include "opt_compat.h"
47 #include "opt_cpu.h"
48 #include "opt_ddb.h"
49 #include "opt_inet.h"
50 #include "opt_ipx.h"
51 #include "opt_isa.h"
52 #include "opt_kstack_pages.h"
53 #include "opt_maxmem.h"
54 #include "opt_msgbuf.h"
55 #include "opt_perfmon.h"
56
57 #include <sys/param.h>
58 #include <sys/proc.h>
59 #include <sys/systm.h>
60 #include <sys/bio.h>
61 #include <sys/buf.h>
62 #include <sys/bus.h>
63 #include <sys/callout.h>
64 #include <sys/clock.h>
65 #include <sys/cons.h>
66 #include <sys/cpu.h>
67 #include <sys/eventhandler.h>
68 #include <sys/exec.h>
69 #include <sys/imgact.h>
70 #include <sys/kdb.h>
71 #include <sys/kernel.h>
72 #include <sys/ktr.h>
73 #include <sys/linker.h>
74 #include <sys/lock.h>
75 #include <sys/malloc.h>
76 #include <sys/memrange.h>
77 #include <sys/msgbuf.h>
78 #include <sys/mutex.h>
79 #include <sys/pcpu.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>
89
90 #include <vm/vm.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>
98
99 #ifdef DDB
100 #ifndef KDB
101 #error KDB must be enabled in order for DDB to work!
102 #endif
103 #endif
104 #include <ddb/ddb.h>
105
106 #include <net/netisr.h>
107
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>
120 #ifdef PERFMON
121 #include <machine/perfmon.h>
122 #endif
123 #include <machine/tss.h>
124 #ifdef SMP
125 #include <machine/smp.h>
126 #endif
127
128 #ifdef DEV_ATPIC
129 #include <amd64/isa/icu.h>
130 #else
131 #include <machine/apicvar.h>
132 #endif
133
134 #include <isa/isareg.h>
135 #include <isa/rtc.h>
136
137 /* Sanity check for __curthread() */
138 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
139
140 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
141
142 extern void printcpuinfo(void); /* XXX header file */
143 extern void identify_cpu(void);
144 extern void panicifcpuunsupported(void);
145
146 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
147 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
148
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);
153
154 #ifdef DDB
155 extern vm_offset_t ksym_start, ksym_end;
156 #endif
157
158 /* Intel ICH registers */
159 #define ICH_PMBASE 0x400
160 #define ICH_SMI_EN ICH_PMBASE + 0x30
161
162 int _udatasel, _ucodesel, _ucode32sel;
163
164 int cold = 1;
165
166 long Maxmem = 0;
167 long realmem = 0;
168
169 /*
170 * The number of PHYSMAP entries must be one less than the number of
171 * PHYSSEG entries because the PHYSMAP entry that spans the largest
172 * physical address that is accessible by ISA DMA is split into two
173 * PHYSSEG entries.
174 */
175 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
176
177 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
178 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
179
180 /* must be 2 less so 0 0 can signal end of chunks */
181 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
182 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
183
184 struct kva_md_info kmi;
185
186 static struct trapframe proc0_tf;
187 struct region_descriptor r_gdt, r_idt;
188
189 struct pcpu __pcpu[MAXCPU];
190
191 struct mtx icu_lock;
192
193 struct mem_range_softc mem_range_softc;
194
195 static void
196 cpu_startup(dummy)
197 void *dummy;
198 {
199 char *sysenv;
200
201 /*
202 * On MacBooks, we need to disallow the legacy USB circuit to
203 * generate an SMI# because this can cause several problems,
204 * namely: incorrect CPU frequency detection and failure to
205 * start the APs.
206 * We do this by disabling a bit in the SMI_EN (SMI Control and
207 * Enable register) of the Intel ICH LPC Interface Bridge.
208 */
209 sysenv = getenv("smbios.system.product");
210 if (sysenv != NULL) {
211 if (strncmp(sysenv, "MacBook", 7) == 0) {
212 if (bootverbose)
213 printf("Disabling LEGACY_USB_EN bit on "
214 "Intel ICH.\n");
215 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
216 }
217 freeenv(sysenv);
218 }
219
220 /*
221 * Good {morning,afternoon,evening,night}.
222 */
223 startrtclock();
224 printcpuinfo();
225 panicifcpuunsupported();
226 #ifdef PERFMON
227 perfmon_init();
228 #endif
229 printf("usable memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem),
230 ptoa((uintmax_t)physmem) / 1048576);
231 realmem = Maxmem;
232 /*
233 * Display any holes after the first chunk of extended memory.
234 */
235 if (bootverbose) {
236 int indx;
237
238 printf("Physical memory chunk(s):\n");
239 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
240 vm_paddr_t size;
241
242 size = phys_avail[indx + 1] - phys_avail[indx];
243 printf(
244 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
245 (uintmax_t)phys_avail[indx],
246 (uintmax_t)phys_avail[indx + 1] - 1,
247 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
248 }
249 }
250
251 vm_ksubmap_init(&kmi);
252
253 printf("avail memory = %ju (%ju MB)\n",
254 ptoa((uintmax_t)cnt.v_free_count),
255 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
256
257 /*
258 * Set up buffers, so they can be used to read disk labels.
259 */
260 bufinit();
261 vm_pager_bufferinit();
262
263 cpu_setregs();
264 }
265
266 /*
267 * Send an interrupt to process.
268 *
269 * Stack is set up to allow sigcode stored
270 * at top to call routine, followed by kcall
271 * to sigreturn routine below. After sigreturn
272 * resets the signal mask, the stack, and the
273 * frame pointer, it returns to the user
274 * specified pc, psl.
275 */
276 void
277 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
278 {
279 struct sigframe sf, *sfp;
280 struct proc *p;
281 struct thread *td;
282 struct sigacts *psp;
283 char *sp;
284 struct trapframe *regs;
285 int sig;
286 int oonstack;
287
288 td = curthread;
289 p = td->td_proc;
290 PROC_LOCK_ASSERT(p, MA_OWNED);
291 sig = ksi->ksi_signo;
292 psp = p->p_sigacts;
293 mtx_assert(&psp->ps_mtx, MA_OWNED);
294 regs = td->td_frame;
295 oonstack = sigonstack(regs->tf_rsp);
296
297 /* Save user context. */
298 bzero(&sf, sizeof(sf));
299 sf.sf_uc.uc_sigmask = *mask;
300 sf.sf_uc.uc_stack = td->td_sigstk;
301 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
302 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
303 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
304 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
305 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
306 get_fpcontext(td, &sf.sf_uc.uc_mcontext);
307 fpstate_drop(td);
308
309 /* Allocate space for the signal handler context. */
310 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
311 SIGISMEMBER(psp->ps_sigonstack, sig)) {
312 sp = td->td_sigstk.ss_sp +
313 td->td_sigstk.ss_size - sizeof(struct sigframe);
314 #if defined(COMPAT_43)
315 td->td_sigstk.ss_flags |= SS_ONSTACK;
316 #endif
317 } else
318 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
319 /* Align to 16 bytes. */
320 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
321
322 /* Translate the signal if appropriate. */
323 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
324 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
325
326 /* Build the argument list for the signal handler. */
327 regs->tf_rdi = sig; /* arg 1 in %rdi */
328 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
329 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
330 /* Signal handler installed with SA_SIGINFO. */
331 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
332 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
333
334 /* Fill in POSIX parts */
335 sf.sf_si = ksi->ksi_info;
336 sf.sf_si.si_signo = sig; /* maybe a translated signal */
337 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
338 } else {
339 /* Old FreeBSD-style arguments. */
340 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
341 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
342 sf.sf_ahu.sf_handler = catcher;
343 }
344 mtx_unlock(&psp->ps_mtx);
345 PROC_UNLOCK(p);
346
347 /*
348 * Copy the sigframe out to the user's stack.
349 */
350 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
351 #ifdef DEBUG
352 printf("process %ld has trashed its stack\n", (long)p->p_pid);
353 #endif
354 PROC_LOCK(p);
355 sigexit(td, SIGILL);
356 }
357
358 regs->tf_rsp = (long)sfp;
359 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
360 regs->tf_rflags &= ~(PSL_T | PSL_D);
361 regs->tf_cs = _ucodesel;
362 PROC_LOCK(p);
363 mtx_lock(&psp->ps_mtx);
364 }
365
366 /*
367 * System call to cleanup state after a signal
368 * has been taken. Reset signal mask and
369 * stack state from context left by sendsig (above).
370 * Return to previous pc and psl as specified by
371 * context left by sendsig. Check carefully to
372 * make sure that the user has not modified the
373 * state to gain improper privileges.
374 *
375 * MPSAFE
376 */
377 int
378 sigreturn(td, uap)
379 struct thread *td;
380 struct sigreturn_args /* {
381 const struct __ucontext *sigcntxp;
382 } */ *uap;
383 {
384 ucontext_t uc;
385 struct proc *p = td->td_proc;
386 struct trapframe *regs;
387 const ucontext_t *ucp;
388 long rflags;
389 int cs, error, ret;
390 ksiginfo_t ksi;
391
392 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
393 if (error != 0)
394 return (error);
395 ucp = &uc;
396 regs = td->td_frame;
397 rflags = ucp->uc_mcontext.mc_rflags;
398 /*
399 * Don't allow users to change privileged or reserved flags.
400 */
401 /*
402 * XXX do allow users to change the privileged flag PSL_RF.
403 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
404 * should sometimes set it there too. tf_rflags is kept in
405 * the signal context during signal handling and there is no
406 * other place to remember it, so the PSL_RF bit may be
407 * corrupted by the signal handler without us knowing.
408 * Corruption of the PSL_RF bit at worst causes one more or
409 * one less debugger trap, so allowing it is fairly harmless.
410 */
411 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
412 printf("sigreturn: rflags = 0x%lx\n", rflags);
413 return (EINVAL);
414 }
415
416 /*
417 * Don't allow users to load a valid privileged %cs. Let the
418 * hardware check for invalid selectors, excess privilege in
419 * other selectors, invalid %eip's and invalid %esp's.
420 */
421 cs = ucp->uc_mcontext.mc_cs;
422 if (!CS_SECURE(cs)) {
423 printf("sigreturn: cs = 0x%x\n", cs);
424 ksiginfo_init_trap(&ksi);
425 ksi.ksi_signo = SIGBUS;
426 ksi.ksi_code = BUS_OBJERR;
427 ksi.ksi_trapno = T_PROTFLT;
428 ksi.ksi_addr = (void *)regs->tf_rip;
429 trapsignal(td, &ksi);
430 return (EINVAL);
431 }
432
433 ret = set_fpcontext(td, &ucp->uc_mcontext);
434 if (ret != 0)
435 return (ret);
436 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
437
438 PROC_LOCK(p);
439 #if defined(COMPAT_43)
440 if (ucp->uc_mcontext.mc_onstack & 1)
441 td->td_sigstk.ss_flags |= SS_ONSTACK;
442 else
443 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
444 #endif
445
446 td->td_sigmask = ucp->uc_sigmask;
447 SIG_CANTMASK(td->td_sigmask);
448 signotify(td);
449 PROC_UNLOCK(p);
450 td->td_pcb->pcb_flags |= PCB_FULLCTX;
451 return (EJUSTRETURN);
452 }
453
454 #ifdef COMPAT_FREEBSD4
455 int
456 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
457 {
458
459 return sigreturn(td, (struct sigreturn_args *)uap);
460 }
461 #endif
462
463
464 /*
465 * Machine dependent boot() routine
466 *
467 * I haven't seen anything to put here yet
468 * Possibly some stuff might be grafted back here from boot()
469 */
470 void
471 cpu_boot(int howto)
472 {
473 }
474
475 /* Get current clock frequency for the given cpu id. */
476 int
477 cpu_est_clockrate(int cpu_id, uint64_t *rate)
478 {
479 register_t reg;
480 uint64_t tsc1, tsc2;
481
482 if (pcpu_find(cpu_id) == NULL || rate == NULL)
483 return (EINVAL);
484
485 /* If we're booting, trust the rate calibrated moments ago. */
486 if (cold) {
487 *rate = tsc_freq;
488 return (0);
489 }
490
491 #ifdef SMP
492 /* Schedule ourselves on the indicated cpu. */
493 thread_lock(curthread);
494 sched_bind(curthread, cpu_id);
495 thread_unlock(curthread);
496 #endif
497
498 /* Calibrate by measuring a short delay. */
499 reg = intr_disable();
500 tsc1 = rdtsc();
501 DELAY(1000);
502 tsc2 = rdtsc();
503 intr_restore(reg);
504
505 #ifdef SMP
506 thread_lock(curthread);
507 sched_unbind(curthread);
508 thread_unlock(curthread);
509 #endif
510
511 /*
512 * Calculate the difference in readings, convert to Mhz, and
513 * subtract 0.5% of the total. Empirical testing has shown that
514 * overhead in DELAY() works out to approximately this value.
515 */
516 tsc2 -= tsc1;
517 *rate = tsc2 * 1000 - tsc2 * 5;
518 return (0);
519 }
520
521 /*
522 * Shutdown the CPU as much as possible
523 */
524 void
525 cpu_halt(void)
526 {
527 for (;;)
528 __asm__ ("hlt");
529 }
530
531 /*
532 * Hook to idle the CPU when possible. In the SMP case we default to
533 * off because a halted cpu will not currently pick up a new thread in the
534 * run queue until the next timer tick. If turned on this will result in
535 * approximately a 4.2% loss in real time performance in buildworld tests
536 * (but improves user and sys times oddly enough), and saves approximately
537 * 5% in power consumption on an idle machine (tests w/2xCPU 1.1GHz P3).
538 *
539 * XXX we need to have a cpu mask of idle cpus and generate an IPI or
540 * otherwise generate some sort of interrupt to wake up cpus sitting in HLT.
541 * Then we can have our cake and eat it too.
542 *
543 * XXX I'm turning it on for SMP as well by default for now. It seems to
544 * help lock contention somewhat, and this is critical for HTT. -Peter
545 */
546 static int cpu_idle_hlt = 1;
547 TUNABLE_INT("machdep.cpu_idle_hlt", &cpu_idle_hlt);
548 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
549 &cpu_idle_hlt, 0, "Idle loop HLT enable");
550
551 static void
552 cpu_idle_default(void)
553 {
554 /*
555 * we must absolutely guarentee that hlt is the
556 * absolute next instruction after sti or we
557 * introduce a timing window.
558 */
559 __asm __volatile("sti; hlt");
560 }
561
562 /*
563 * Note that we have to be careful here to avoid a race between checking
564 * sched_runnable() and actually halting. If we don't do this, we may waste
565 * the time between calling hlt and the next interrupt even though there
566 * is a runnable process.
567 */
568 void
569 cpu_idle(void)
570 {
571
572 #ifdef SMP
573 if (mp_grab_cpu_hlt())
574 return;
575 #endif
576 if (cpu_idle_hlt) {
577 disable_intr();
578 if (sched_runnable())
579 enable_intr();
580 else
581 (*cpu_idle_hook)();
582 }
583 }
584
585 /* Other subsystems (e.g., ACPI) can hook this later. */
586 void (*cpu_idle_hook)(void) = cpu_idle_default;
587
588 /*
589 * Clear registers on exec
590 */
591 void
592 exec_setregs(td, entry, stack, ps_strings)
593 struct thread *td;
594 u_long entry;
595 u_long stack;
596 u_long ps_strings;
597 {
598 struct trapframe *regs = td->td_frame;
599 struct pcb *pcb = td->td_pcb;
600
601 critical_enter();
602 wrmsr(MSR_FSBASE, 0);
603 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
604 pcb->pcb_fsbase = 0;
605 pcb->pcb_gsbase = 0;
606 critical_exit();
607 pcb->pcb_flags &= ~(PCB_32BIT | PCB_GS32BIT);
608 load_ds(_udatasel);
609 load_es(_udatasel);
610 load_fs(_udatasel);
611 load_gs(_udatasel);
612 pcb->pcb_ds = _udatasel;
613 pcb->pcb_es = _udatasel;
614 pcb->pcb_fs = _udatasel;
615 pcb->pcb_gs = _udatasel;
616
617 bzero((char *)regs, sizeof(struct trapframe));
618 regs->tf_rip = entry;
619 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
620 regs->tf_rdi = stack; /* argv */
621 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
622 regs->tf_ss = _udatasel;
623 regs->tf_cs = _ucodesel;
624
625 /*
626 * Reset the hardware debug registers if they were in use.
627 * They won't have any meaning for the newly exec'd process.
628 */
629 if (pcb->pcb_flags & PCB_DBREGS) {
630 pcb->pcb_dr0 = 0;
631 pcb->pcb_dr1 = 0;
632 pcb->pcb_dr2 = 0;
633 pcb->pcb_dr3 = 0;
634 pcb->pcb_dr6 = 0;
635 pcb->pcb_dr7 = 0;
636 if (pcb == PCPU_GET(curpcb)) {
637 /*
638 * Clear the debug registers on the running
639 * CPU, otherwise they will end up affecting
640 * the next process we switch to.
641 */
642 reset_dbregs();
643 }
644 pcb->pcb_flags &= ~PCB_DBREGS;
645 }
646
647 /*
648 * Drop the FP state if we hold it, so that the process gets a
649 * clean FP state if it uses the FPU again.
650 */
651 fpstate_drop(td);
652 }
653
654 void
655 cpu_setregs(void)
656 {
657 register_t cr0;
658
659 cr0 = rcr0();
660 /*
661 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
662 * BSP. See the comments there about why we set them.
663 */
664 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
665 load_cr0(cr0);
666 }
667
668 /*
669 * Initialize amd64 and configure to run kernel
670 */
671
672 /*
673 * Initialize segments & interrupt table
674 */
675
676 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
677 static struct gate_descriptor idt0[NIDT];
678 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
679
680 static char dblfault_stack[PAGE_SIZE] __aligned(16);
681
682 struct amd64tss common_tss[MAXCPU];
683
684 /* software prototypes -- in more palatable form */
685 struct soft_segment_descriptor gdt_segs[] = {
686 /* GNULL_SEL 0 Null Descriptor */
687 { 0x0, /* segment base address */
688 0x0, /* length */
689 0, /* segment type */
690 0, /* segment descriptor priority level */
691 0, /* segment descriptor present */
692 0, /* long */
693 0, /* default 32 vs 16 bit size */
694 0 /* limit granularity (byte/page units)*/ },
695 /* GCODE_SEL 1 Code Descriptor for kernel */
696 { 0x0, /* segment base address */
697 0xfffff, /* length - all address space */
698 SDT_MEMERA, /* segment type */
699 SEL_KPL, /* segment descriptor priority level */
700 1, /* segment descriptor present */
701 1, /* long */
702 0, /* default 32 vs 16 bit size */
703 1 /* limit granularity (byte/page units)*/ },
704 /* GDATA_SEL 2 Data Descriptor for kernel */
705 { 0x0, /* segment base address */
706 0xfffff, /* length - all address space */
707 SDT_MEMRWA, /* segment type */
708 SEL_KPL, /* segment descriptor priority level */
709 1, /* segment descriptor present */
710 1, /* long */
711 0, /* default 32 vs 16 bit size */
712 1 /* limit granularity (byte/page units)*/ },
713 /* GUCODE32_SEL 3 32 bit Code Descriptor for user */
714 { 0x0, /* segment base address */
715 0xfffff, /* length - all address space */
716 SDT_MEMERA, /* segment type */
717 SEL_UPL, /* segment descriptor priority level */
718 1, /* segment descriptor present */
719 0, /* long */
720 1, /* default 32 vs 16 bit size */
721 1 /* limit granularity (byte/page units)*/ },
722 /* GUDATA_SEL 4 32/64 bit Data Descriptor for user */
723 { 0x0, /* segment base address */
724 0xfffff, /* length - all address space */
725 SDT_MEMRWA, /* segment type */
726 SEL_UPL, /* segment descriptor priority level */
727 1, /* segment descriptor present */
728 0, /* long */
729 1, /* default 32 vs 16 bit size */
730 1 /* limit granularity (byte/page units)*/ },
731 /* GUCODE_SEL 5 64 bit Code Descriptor for user */
732 { 0x0, /* segment base address */
733 0xfffff, /* length - all address space */
734 SDT_MEMERA, /* segment type */
735 SEL_UPL, /* segment descriptor priority level */
736 1, /* segment descriptor present */
737 1, /* long */
738 0, /* default 32 vs 16 bit size */
739 1 /* limit granularity (byte/page units)*/ },
740 /* GPROC0_SEL 6 Proc 0 Tss Descriptor */
741 {
742 0x0, /* segment base address */
743 sizeof(struct amd64tss)-1,/* length */
744 SDT_SYSTSS, /* segment type */
745 SEL_KPL, /* segment descriptor priority level */
746 1, /* segment descriptor present */
747 0, /* long */
748 0, /* unused - default 32 vs 16 bit size */
749 0 /* limit granularity (byte/page units)*/ },
750 /* Actually, the TSS is a system descriptor which is double size */
751 { 0x0, /* segment base address */
752 0x0, /* length */
753 0, /* segment type */
754 0, /* segment descriptor priority level */
755 0, /* segment descriptor present */
756 0, /* long */
757 0, /* default 32 vs 16 bit size */
758 0 /* limit granularity (byte/page units)*/ },
759 /* GUGS32_SEL 8 32 bit GS Descriptor for user */
760 { 0x0, /* segment base address */
761 0xfffff, /* length - all address space */
762 SDT_MEMRWA, /* segment type */
763 SEL_UPL, /* segment descriptor priority level */
764 1, /* segment descriptor present */
765 0, /* long */
766 1, /* default 32 vs 16 bit size */
767 1 /* limit granularity (byte/page units)*/ },
768 };
769
770 void
771 setidt(idx, func, typ, dpl, ist)
772 int idx;
773 inthand_t *func;
774 int typ;
775 int dpl;
776 int ist;
777 {
778 struct gate_descriptor *ip;
779
780 ip = idt + idx;
781 ip->gd_looffset = (uintptr_t)func;
782 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
783 ip->gd_ist = ist;
784 ip->gd_xx = 0;
785 ip->gd_type = typ;
786 ip->gd_dpl = dpl;
787 ip->gd_p = 1;
788 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
789 }
790
791 extern inthand_t
792 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
793 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
794 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
795 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
796 IDTVEC(xmm), IDTVEC(dblfault),
797 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
798
799 void
800 sdtossd(sd, ssd)
801 struct user_segment_descriptor *sd;
802 struct soft_segment_descriptor *ssd;
803 {
804
805 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
806 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
807 ssd->ssd_type = sd->sd_type;
808 ssd->ssd_dpl = sd->sd_dpl;
809 ssd->ssd_p = sd->sd_p;
810 ssd->ssd_long = sd->sd_long;
811 ssd->ssd_def32 = sd->sd_def32;
812 ssd->ssd_gran = sd->sd_gran;
813 }
814
815 void
816 ssdtosd(ssd, sd)
817 struct soft_segment_descriptor *ssd;
818 struct user_segment_descriptor *sd;
819 {
820
821 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
822 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
823 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
824 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
825 sd->sd_type = ssd->ssd_type;
826 sd->sd_dpl = ssd->ssd_dpl;
827 sd->sd_p = ssd->ssd_p;
828 sd->sd_long = ssd->ssd_long;
829 sd->sd_def32 = ssd->ssd_def32;
830 sd->sd_gran = ssd->ssd_gran;
831 }
832
833 void
834 ssdtosyssd(ssd, sd)
835 struct soft_segment_descriptor *ssd;
836 struct system_segment_descriptor *sd;
837 {
838
839 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
840 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
841 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
842 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
843 sd->sd_type = ssd->ssd_type;
844 sd->sd_dpl = ssd->ssd_dpl;
845 sd->sd_p = ssd->ssd_p;
846 sd->sd_gran = ssd->ssd_gran;
847 }
848
849 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
850 #include <isa/isavar.h>
851 u_int
852 isa_irq_pending(void)
853 {
854
855 return (0);
856 }
857 #endif
858
859 u_int basemem;
860
861 /*
862 * Populate the (physmap) array with base/bound pairs describing the
863 * available physical memory in the system, then test this memory and
864 * build the phys_avail array describing the actually-available memory.
865 *
866 * If we cannot accurately determine the physical memory map, then use
867 * value from the 0xE801 call, and failing that, the RTC.
868 *
869 * Total memory size may be set by the kernel environment variable
870 * hw.physmem or the compile-time define MAXMEM.
871 *
872 * XXX first should be vm_paddr_t.
873 */
874 static void
875 getmemsize(caddr_t kmdp, u_int64_t first)
876 {
877 int i, off, physmap_idx, pa_indx, da_indx;
878 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
879 u_long physmem_tunable;
880 pt_entry_t *pte;
881 struct bios_smap *smapbase, *smap, *smapend;
882 u_int32_t smapsize;
883 quad_t dcons_addr, dcons_size;
884
885 bzero(physmap, sizeof(physmap));
886 basemem = 0;
887 physmap_idx = 0;
888
889 /*
890 * get memory map from INT 15:E820, kindly supplied by the loader.
891 *
892 * subr_module.c says:
893 * "Consumer may safely assume that size value precedes data."
894 * ie: an int32_t immediately precedes smap.
895 */
896 smapbase = (struct bios_smap *)preload_search_info(kmdp,
897 MODINFO_METADATA | MODINFOMD_SMAP);
898 if (smapbase == NULL)
899 panic("No BIOS smap info from loader!");
900
901 smapsize = *((u_int32_t *)smapbase - 1);
902 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
903
904 for (smap = smapbase; smap < smapend; smap++) {
905 if (boothowto & RB_VERBOSE)
906 printf("SMAP type=%02x base=%016lx len=%016lx\n",
907 smap->type, smap->base, smap->length);
908
909 if (smap->type != SMAP_TYPE_MEMORY)
910 continue;
911
912 if (smap->length == 0)
913 continue;
914
915 for (i = 0; i <= physmap_idx; i += 2) {
916 if (smap->base < physmap[i + 1]) {
917 if (boothowto & RB_VERBOSE)
918 printf(
919 "Overlapping or non-monotonic memory region, ignoring second region\n");
920 continue;
921 }
922 }
923
924 if (smap->base == physmap[physmap_idx + 1]) {
925 physmap[physmap_idx + 1] += smap->length;
926 continue;
927 }
928
929 physmap_idx += 2;
930 if (physmap_idx == PHYSMAP_SIZE) {
931 printf(
932 "Too many segments in the physical address map, giving up\n");
933 break;
934 }
935 physmap[physmap_idx] = smap->base;
936 physmap[physmap_idx + 1] = smap->base + smap->length;
937 }
938
939 /*
940 * Find the 'base memory' segment for SMP
941 */
942 basemem = 0;
943 for (i = 0; i <= physmap_idx; i += 2) {
944 if (physmap[i] == 0x00000000) {
945 basemem = physmap[i + 1] / 1024;
946 break;
947 }
948 }
949 if (basemem == 0)
950 panic("BIOS smap did not include a basemem segment!");
951
952 #ifdef SMP
953 /* make hole for AP bootstrap code */
954 physmap[1] = mp_bootaddress(physmap[1] / 1024);
955 #endif
956
957 /*
958 * Maxmem isn't the "maximum memory", it's one larger than the
959 * highest page of the physical address space. It should be
960 * called something like "Maxphyspage". We may adjust this
961 * based on ``hw.physmem'' and the results of the memory test.
962 */
963 Maxmem = atop(physmap[physmap_idx + 1]);
964
965 #ifdef MAXMEM
966 Maxmem = MAXMEM / 4;
967 #endif
968
969 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
970 Maxmem = atop(physmem_tunable);
971
972 /*
973 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
974 * in the system.
975 */
976 if (Maxmem > atop(physmap[physmap_idx + 1]))
977 Maxmem = atop(physmap[physmap_idx + 1]);
978
979 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
980 (boothowto & RB_VERBOSE))
981 printf("Physical memory use set to %ldK\n", Maxmem * 4);
982
983 /* call pmap initialization to make new kernel address space */
984 pmap_bootstrap(&first);
985
986 /*
987 * Size up each available chunk of physical memory.
988 */
989 physmap[0] = PAGE_SIZE; /* mask off page 0 */
990 pa_indx = 0;
991 da_indx = 1;
992 phys_avail[pa_indx++] = physmap[0];
993 phys_avail[pa_indx] = physmap[0];
994 dump_avail[da_indx] = physmap[0];
995 pte = CMAP1;
996
997 /*
998 * Get dcons buffer address
999 */
1000 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1001 getenv_quad("dcons.size", &dcons_size) == 0)
1002 dcons_addr = 0;
1003
1004 /*
1005 * physmap is in bytes, so when converting to page boundaries,
1006 * round up the start address and round down the end address.
1007 */
1008 for (i = 0; i <= physmap_idx; i += 2) {
1009 vm_paddr_t end;
1010
1011 end = ptoa((vm_paddr_t)Maxmem);
1012 if (physmap[i + 1] < end)
1013 end = trunc_page(physmap[i + 1]);
1014 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1015 int tmp, page_bad, full;
1016 int *ptr = (int *)CADDR1;
1017
1018 full = FALSE;
1019 /*
1020 * block out kernel memory as not available.
1021 */
1022 if (pa >= 0x100000 && pa < first)
1023 goto do_dump_avail;
1024
1025 /*
1026 * block out dcons buffer
1027 */
1028 if (dcons_addr > 0
1029 && pa >= trunc_page(dcons_addr)
1030 && pa < dcons_addr + dcons_size)
1031 goto do_dump_avail;
1032
1033 page_bad = FALSE;
1034
1035 /*
1036 * map page into kernel: valid, read/write,non-cacheable
1037 */
1038 *pte = pa | PG_V | PG_RW | PG_N;
1039 invltlb();
1040
1041 tmp = *(int *)ptr;
1042 /*
1043 * Test for alternating 1's and 0's
1044 */
1045 *(volatile int *)ptr = 0xaaaaaaaa;
1046 if (*(volatile int *)ptr != 0xaaaaaaaa)
1047 page_bad = TRUE;
1048 /*
1049 * Test for alternating 0's and 1's
1050 */
1051 *(volatile int *)ptr = 0x55555555;
1052 if (*(volatile int *)ptr != 0x55555555)
1053 page_bad = TRUE;
1054 /*
1055 * Test for all 1's
1056 */
1057 *(volatile int *)ptr = 0xffffffff;
1058 if (*(volatile int *)ptr != 0xffffffff)
1059 page_bad = TRUE;
1060 /*
1061 * Test for all 0's
1062 */
1063 *(volatile int *)ptr = 0x0;
1064 if (*(volatile int *)ptr != 0x0)
1065 page_bad = TRUE;
1066 /*
1067 * Restore original value.
1068 */
1069 *(int *)ptr = tmp;
1070
1071 /*
1072 * Adjust array of valid/good pages.
1073 */
1074 if (page_bad == TRUE)
1075 continue;
1076 /*
1077 * If this good page is a continuation of the
1078 * previous set of good pages, then just increase
1079 * the end pointer. Otherwise start a new chunk.
1080 * Note that "end" points one higher than end,
1081 * making the range >= start and < end.
1082 * If we're also doing a speculative memory
1083 * test and we at or past the end, bump up Maxmem
1084 * so that we keep going. The first bad page
1085 * will terminate the loop.
1086 */
1087 if (phys_avail[pa_indx] == pa) {
1088 phys_avail[pa_indx] += PAGE_SIZE;
1089 } else {
1090 pa_indx++;
1091 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1092 printf(
1093 "Too many holes in the physical address space, giving up\n");
1094 pa_indx--;
1095 full = TRUE;
1096 goto do_dump_avail;
1097 }
1098 phys_avail[pa_indx++] = pa; /* start */
1099 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1100 }
1101 physmem++;
1102 do_dump_avail:
1103 if (dump_avail[da_indx] == pa) {
1104 dump_avail[da_indx] += PAGE_SIZE;
1105 } else {
1106 da_indx++;
1107 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1108 da_indx--;
1109 goto do_next;
1110 }
1111 dump_avail[da_indx++] = pa; /* start */
1112 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1113 }
1114 do_next:
1115 if (full)
1116 break;
1117 }
1118 }
1119 *pte = 0;
1120 invltlb();
1121
1122 /*
1123 * XXX
1124 * The last chunk must contain at least one page plus the message
1125 * buffer to avoid complicating other code (message buffer address
1126 * calculation, etc.).
1127 */
1128 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1129 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1130 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1131 phys_avail[pa_indx--] = 0;
1132 phys_avail[pa_indx--] = 0;
1133 }
1134
1135 Maxmem = atop(phys_avail[pa_indx]);
1136
1137 /* Trim off space for the message buffer. */
1138 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1139
1140 /* Map the message buffer. */
1141 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1142 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
1143 off);
1144 }
1145
1146 u_int64_t
1147 hammer_time(u_int64_t modulep, u_int64_t physfree)
1148 {
1149 caddr_t kmdp;
1150 int gsel_tss, x;
1151 struct pcpu *pc;
1152 u_int64_t msr;
1153 char *env;
1154
1155 thread0.td_kstack = physfree + KERNBASE;
1156 bzero((void *)thread0.td_kstack, KSTACK_PAGES * PAGE_SIZE);
1157 physfree += KSTACK_PAGES * PAGE_SIZE;
1158 thread0.td_pcb = (struct pcb *)
1159 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
1160
1161 /*
1162 * This may be done better later if it gets more high level
1163 * components in it. If so just link td->td_proc here.
1164 */
1165 proc_linkup0(&proc0, &thread0);
1166
1167 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1168 preload_bootstrap_relocate(KERNBASE);
1169 kmdp = preload_search_by_type("elf kernel");
1170 if (kmdp == NULL)
1171 kmdp = preload_search_by_type("elf64 kernel");
1172 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1173 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1174 #ifdef DDB
1175 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1176 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1177 #endif
1178
1179 /* Init basic tunables, hz etc */
1180 init_param1();
1181
1182 /*
1183 * make gdt memory segments
1184 */
1185 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1186
1187 for (x = 0; x < NGDT; x++) {
1188 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
1189 ssdtosd(&gdt_segs[x], &gdt[x]);
1190 }
1191 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1192 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1193
1194 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1195 r_gdt.rd_base = (long) gdt;
1196 lgdt(&r_gdt);
1197 pc = &__pcpu[0];
1198
1199 wrmsr(MSR_FSBASE, 0); /* User value */
1200 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1201 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1202
1203 pcpu_init(pc, 0, sizeof(struct pcpu));
1204 PCPU_SET(prvspace, pc);
1205 PCPU_SET(curthread, &thread0);
1206 PCPU_SET(curpcb, thread0.td_pcb);
1207 PCPU_SET(tssp, &common_tss[0]);
1208 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1209
1210 /*
1211 * Initialize mutexes.
1212 *
1213 * icu_lock: in order to allow an interrupt to occur in a critical
1214 * section, to set pcpu->ipending (etc...) properly, we
1215 * must be able to get the icu lock, so it can't be
1216 * under witness.
1217 */
1218 mutex_init();
1219 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1220
1221 /* exceptions */
1222 for (x = 0; x < NIDT; x++)
1223 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1224 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1225 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1226 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1);
1227 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1228 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1229 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1230 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1231 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1232 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1233 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1234 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1235 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1236 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1237 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1238 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1239 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1240 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1241 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1242 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1243
1244 r_idt.rd_limit = sizeof(idt0) - 1;
1245 r_idt.rd_base = (long) idt;
1246 lidt(&r_idt);
1247
1248 /*
1249 * Initialize the i8254 before the console so that console
1250 * initialization can use DELAY().
1251 */
1252 i8254_init();
1253
1254 /*
1255 * Initialize the console before we print anything out.
1256 */
1257 cninit();
1258
1259 #ifdef DEV_ISA
1260 #ifdef DEV_ATPIC
1261 elcr_probe();
1262 atpic_startup();
1263 #else
1264 /* Reset and mask the atpics and leave them shut down. */
1265 atpic_reset();
1266
1267 /*
1268 * Point the ICU spurious interrupt vectors at the APIC spurious
1269 * interrupt handler.
1270 */
1271 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1272 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1273 #endif
1274 #else
1275 #error "have you forgotten the isa device?";
1276 #endif
1277
1278 kdb_init();
1279
1280 #ifdef KDB
1281 if (boothowto & RB_KDB)
1282 kdb_enter_why(KDB_WHY_BOOTFLAGS,
1283 "Boot flags requested debugger");
1284 #endif
1285
1286 identify_cpu(); /* Final stage of CPU initialization */
1287 initializecpu(); /* Initialize CPU registers */
1288
1289 /* make an initial tss so cpu can get interrupt stack on syscall! */
1290 common_tss[0].tss_rsp0 = thread0.td_kstack + \
1291 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb);
1292 /* Ensure the stack is aligned to 16 bytes */
1293 common_tss[0].tss_rsp0 &= ~0xFul;
1294 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1295
1296 /* doublefault stack space, runs on ist1 */
1297 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1298
1299 /* Set the IO permission bitmap (empty due to tss seg limit) */
1300 common_tss[0].tss_iobase = sizeof(struct amd64tss);
1301
1302 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1303 ltr(gsel_tss);
1304
1305 /* Set up the fast syscall stuff */
1306 msr = rdmsr(MSR_EFER) | EFER_SCE;
1307 wrmsr(MSR_EFER, msr);
1308 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1309 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1310 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1311 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1312 wrmsr(MSR_STAR, msr);
1313 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1314
1315 getmemsize(kmdp, physfree);
1316 init_param2(physmem);
1317
1318 /* now running on new page tables, configured,and u/iom is accessible */
1319
1320 msgbufinit(msgbufp, MSGBUF_SIZE);
1321 fpuinit();
1322
1323 /* transfer to user mode */
1324
1325 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1326 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1327 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1328
1329 /* setup proc 0's pcb */
1330 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */
1331 thread0.td_pcb->pcb_cr3 = KPML4phys;
1332 thread0.td_frame = &proc0_tf;
1333
1334 env = getenv("kernelname");
1335 if (env != NULL)
1336 strlcpy(kernelname, env, sizeof(kernelname));
1337
1338 /* Location of kernel stack for locore */
1339 return ((u_int64_t)thread0.td_pcb);
1340 }
1341
1342 void
1343 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1344 {
1345
1346 pcpu->pc_acpi_id = 0xffffffff;
1347 }
1348
1349 void
1350 spinlock_enter(void)
1351 {
1352 struct thread *td;
1353
1354 td = curthread;
1355 if (td->td_md.md_spinlock_count == 0)
1356 td->td_md.md_saved_flags = intr_disable();
1357 td->td_md.md_spinlock_count++;
1358 critical_enter();
1359 }
1360
1361 void
1362 spinlock_exit(void)
1363 {
1364 struct thread *td;
1365
1366 td = curthread;
1367 critical_exit();
1368 td->td_md.md_spinlock_count--;
1369 if (td->td_md.md_spinlock_count == 0)
1370 intr_restore(td->td_md.md_saved_flags);
1371 }
1372
1373 /*
1374 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1375 * we want to start a backtrace from the function that caused us to enter
1376 * the debugger. We have the context in the trapframe, but base the trace
1377 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1378 * enough for a backtrace.
1379 */
1380 void
1381 makectx(struct trapframe *tf, struct pcb *pcb)
1382 {
1383
1384 pcb->pcb_r12 = tf->tf_r12;
1385 pcb->pcb_r13 = tf->tf_r13;
1386 pcb->pcb_r14 = tf->tf_r14;
1387 pcb->pcb_r15 = tf->tf_r15;
1388 pcb->pcb_rbp = tf->tf_rbp;
1389 pcb->pcb_rbx = tf->tf_rbx;
1390 pcb->pcb_rip = tf->tf_rip;
1391 pcb->pcb_rsp = (ISPL(tf->tf_cs)) ? tf->tf_rsp : (long)(tf + 1) - 8;
1392 }
1393
1394 int
1395 ptrace_set_pc(struct thread *td, unsigned long addr)
1396 {
1397 td->td_frame->tf_rip = addr;
1398 return (0);
1399 }
1400
1401 int
1402 ptrace_single_step(struct thread *td)
1403 {
1404 td->td_frame->tf_rflags |= PSL_T;
1405 return (0);
1406 }
1407
1408 int
1409 ptrace_clear_single_step(struct thread *td)
1410 {
1411 td->td_frame->tf_rflags &= ~PSL_T;
1412 return (0);
1413 }
1414
1415 int
1416 fill_regs(struct thread *td, struct reg *regs)
1417 {
1418 struct trapframe *tp;
1419
1420 tp = td->td_frame;
1421 regs->r_r15 = tp->tf_r15;
1422 regs->r_r14 = tp->tf_r14;
1423 regs->r_r13 = tp->tf_r13;
1424 regs->r_r12 = tp->tf_r12;
1425 regs->r_r11 = tp->tf_r11;
1426 regs->r_r10 = tp->tf_r10;
1427 regs->r_r9 = tp->tf_r9;
1428 regs->r_r8 = tp->tf_r8;
1429 regs->r_rdi = tp->tf_rdi;
1430 regs->r_rsi = tp->tf_rsi;
1431 regs->r_rbp = tp->tf_rbp;
1432 regs->r_rbx = tp->tf_rbx;
1433 regs->r_rdx = tp->tf_rdx;
1434 regs->r_rcx = tp->tf_rcx;
1435 regs->r_rax = tp->tf_rax;
1436 regs->r_rip = tp->tf_rip;
1437 regs->r_cs = tp->tf_cs;
1438 regs->r_rflags = tp->tf_rflags;
1439 regs->r_rsp = tp->tf_rsp;
1440 regs->r_ss = tp->tf_ss;
1441 return (0);
1442 }
1443
1444 int
1445 set_regs(struct thread *td, struct reg *regs)
1446 {
1447 struct trapframe *tp;
1448 register_t rflags;
1449
1450 tp = td->td_frame;
1451 rflags = regs->r_rflags & 0xffffffff;
1452 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
1453 return (EINVAL);
1454 tp->tf_r15 = regs->r_r15;
1455 tp->tf_r14 = regs->r_r14;
1456 tp->tf_r13 = regs->r_r13;
1457 tp->tf_r12 = regs->r_r12;
1458 tp->tf_r11 = regs->r_r11;
1459 tp->tf_r10 = regs->r_r10;
1460 tp->tf_r9 = regs->r_r9;
1461 tp->tf_r8 = regs->r_r8;
1462 tp->tf_rdi = regs->r_rdi;
1463 tp->tf_rsi = regs->r_rsi;
1464 tp->tf_rbp = regs->r_rbp;
1465 tp->tf_rbx = regs->r_rbx;
1466 tp->tf_rdx = regs->r_rdx;
1467 tp->tf_rcx = regs->r_rcx;
1468 tp->tf_rax = regs->r_rax;
1469 tp->tf_rip = regs->r_rip;
1470 tp->tf_cs = regs->r_cs;
1471 tp->tf_rflags = rflags;
1472 tp->tf_rsp = regs->r_rsp;
1473 tp->tf_ss = regs->r_ss;
1474 td->td_pcb->pcb_flags |= PCB_FULLCTX;
1475 return (0);
1476 }
1477
1478 /* XXX check all this stuff! */
1479 /* externalize from sv_xmm */
1480 static void
1481 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
1482 {
1483 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1484 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1485 int i;
1486
1487 /* pcb -> fpregs */
1488 bzero(fpregs, sizeof(*fpregs));
1489
1490 /* FPU control/status */
1491 penv_fpreg->en_cw = penv_xmm->en_cw;
1492 penv_fpreg->en_sw = penv_xmm->en_sw;
1493 penv_fpreg->en_tw = penv_xmm->en_tw;
1494 penv_fpreg->en_opcode = penv_xmm->en_opcode;
1495 penv_fpreg->en_rip = penv_xmm->en_rip;
1496 penv_fpreg->en_rdp = penv_xmm->en_rdp;
1497 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
1498 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
1499
1500 /* FPU registers */
1501 for (i = 0; i < 8; ++i)
1502 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
1503
1504 /* SSE registers */
1505 for (i = 0; i < 16; ++i)
1506 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
1507 }
1508
1509 /* internalize from fpregs into sv_xmm */
1510 static void
1511 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
1512 {
1513 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1514 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1515 int i;
1516
1517 /* fpregs -> pcb */
1518 /* FPU control/status */
1519 penv_xmm->en_cw = penv_fpreg->en_cw;
1520 penv_xmm->en_sw = penv_fpreg->en_sw;
1521 penv_xmm->en_tw = penv_fpreg->en_tw;
1522 penv_xmm->en_opcode = penv_fpreg->en_opcode;
1523 penv_xmm->en_rip = penv_fpreg->en_rip;
1524 penv_xmm->en_rdp = penv_fpreg->en_rdp;
1525 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
1526 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
1527
1528 /* FPU registers */
1529 for (i = 0; i < 8; ++i)
1530 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
1531
1532 /* SSE registers */
1533 for (i = 0; i < 16; ++i)
1534 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
1535 }
1536
1537 /* externalize from td->pcb */
1538 int
1539 fill_fpregs(struct thread *td, struct fpreg *fpregs)
1540 {
1541
1542 fill_fpregs_xmm(&td->td_pcb->pcb_save, fpregs);
1543 return (0);
1544 }
1545
1546 /* internalize to td->pcb */
1547 int
1548 set_fpregs(struct thread *td, struct fpreg *fpregs)
1549 {
1550
1551 set_fpregs_xmm(fpregs, &td->td_pcb->pcb_save);
1552 return (0);
1553 }
1554
1555 /*
1556 * Get machine context.
1557 */
1558 int
1559 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
1560 {
1561 struct trapframe *tp;
1562
1563 tp = td->td_frame;
1564 PROC_LOCK(curthread->td_proc);
1565 mcp->mc_onstack = sigonstack(tp->tf_rsp);
1566 PROC_UNLOCK(curthread->td_proc);
1567 mcp->mc_r15 = tp->tf_r15;
1568 mcp->mc_r14 = tp->tf_r14;
1569 mcp->mc_r13 = tp->tf_r13;
1570 mcp->mc_r12 = tp->tf_r12;
1571 mcp->mc_r11 = tp->tf_r11;
1572 mcp->mc_r10 = tp->tf_r10;
1573 mcp->mc_r9 = tp->tf_r9;
1574 mcp->mc_r8 = tp->tf_r8;
1575 mcp->mc_rdi = tp->tf_rdi;
1576 mcp->mc_rsi = tp->tf_rsi;
1577 mcp->mc_rbp = tp->tf_rbp;
1578 mcp->mc_rbx = tp->tf_rbx;
1579 mcp->mc_rcx = tp->tf_rcx;
1580 mcp->mc_rflags = tp->tf_rflags;
1581 if (flags & GET_MC_CLEAR_RET) {
1582 mcp->mc_rax = 0;
1583 mcp->mc_rdx = 0;
1584 mcp->mc_rflags &= ~PSL_C;
1585 } else {
1586 mcp->mc_rax = tp->tf_rax;
1587 mcp->mc_rdx = tp->tf_rdx;
1588 }
1589 mcp->mc_rip = tp->tf_rip;
1590 mcp->mc_cs = tp->tf_cs;
1591 mcp->mc_rsp = tp->tf_rsp;
1592 mcp->mc_ss = tp->tf_ss;
1593 mcp->mc_len = sizeof(*mcp);
1594 get_fpcontext(td, mcp);
1595 return (0);
1596 }
1597
1598 /*
1599 * Set machine context.
1600 *
1601 * However, we don't set any but the user modifiable flags, and we won't
1602 * touch the cs selector.
1603 */
1604 int
1605 set_mcontext(struct thread *td, const mcontext_t *mcp)
1606 {
1607 struct trapframe *tp;
1608 long rflags;
1609 int ret;
1610
1611 tp = td->td_frame;
1612 if (mcp->mc_len != sizeof(*mcp))
1613 return (EINVAL);
1614 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
1615 (tp->tf_rflags & ~PSL_USERCHANGE);
1616 ret = set_fpcontext(td, mcp);
1617 if (ret != 0)
1618 return (ret);
1619 tp->tf_r15 = mcp->mc_r15;
1620 tp->tf_r14 = mcp->mc_r14;
1621 tp->tf_r13 = mcp->mc_r13;
1622 tp->tf_r12 = mcp->mc_r12;
1623 tp->tf_r11 = mcp->mc_r11;
1624 tp->tf_r10 = mcp->mc_r10;
1625 tp->tf_r9 = mcp->mc_r9;
1626 tp->tf_r8 = mcp->mc_r8;
1627 tp->tf_rdi = mcp->mc_rdi;
1628 tp->tf_rsi = mcp->mc_rsi;
1629 tp->tf_rbp = mcp->mc_rbp;
1630 tp->tf_rbx = mcp->mc_rbx;
1631 tp->tf_rdx = mcp->mc_rdx;
1632 tp->tf_rcx = mcp->mc_rcx;
1633 tp->tf_rax = mcp->mc_rax;
1634 tp->tf_rip = mcp->mc_rip;
1635 tp->tf_rflags = rflags;
1636 tp->tf_rsp = mcp->mc_rsp;
1637 tp->tf_ss = mcp->mc_ss;
1638 td->td_pcb->pcb_flags |= PCB_FULLCTX;
1639 return (0);
1640 }
1641
1642 static void
1643 get_fpcontext(struct thread *td, mcontext_t *mcp)
1644 {
1645
1646 mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate);
1647 mcp->mc_fpformat = fpuformat();
1648 }
1649
1650 static int
1651 set_fpcontext(struct thread *td, const mcontext_t *mcp)
1652 {
1653 struct savefpu *fpstate;
1654
1655 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
1656 return (0);
1657 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
1658 return (EINVAL);
1659 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
1660 /* We don't care what state is left in the FPU or PCB. */
1661 fpstate_drop(td);
1662 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
1663 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
1664 /*
1665 * XXX we violate the dubious requirement that fpusetregs()
1666 * be called with interrupts disabled.
1667 * XXX obsolete on trap-16 systems?
1668 */
1669 fpstate = (struct savefpu *)&mcp->mc_fpstate;
1670 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
1671 fpusetregs(td, fpstate);
1672 } else
1673 return (EINVAL);
1674 return (0);
1675 }
1676
1677 void
1678 fpstate_drop(struct thread *td)
1679 {
1680 register_t s;
1681
1682 s = intr_disable();
1683 if (PCPU_GET(fpcurthread) == td)
1684 fpudrop();
1685 /*
1686 * XXX force a full drop of the fpu. The above only drops it if we
1687 * owned it.
1688 *
1689 * XXX I don't much like fpugetregs()'s semantics of doing a full
1690 * drop. Dropping only to the pcb matches fnsave's behaviour.
1691 * We only need to drop to !PCB_INITDONE in sendsig(). But
1692 * sendsig() is the only caller of fpugetregs()... perhaps we just
1693 * have too many layers.
1694 */
1695 curthread->td_pcb->pcb_flags &= ~PCB_FPUINITDONE;
1696 intr_restore(s);
1697 }
1698
1699 int
1700 fill_dbregs(struct thread *td, struct dbreg *dbregs)
1701 {
1702 struct pcb *pcb;
1703
1704 if (td == NULL) {
1705 dbregs->dr[0] = rdr0();
1706 dbregs->dr[1] = rdr1();
1707 dbregs->dr[2] = rdr2();
1708 dbregs->dr[3] = rdr3();
1709 dbregs->dr[6] = rdr6();
1710 dbregs->dr[7] = rdr7();
1711 } else {
1712 pcb = td->td_pcb;
1713 dbregs->dr[0] = pcb->pcb_dr0;
1714 dbregs->dr[1] = pcb->pcb_dr1;
1715 dbregs->dr[2] = pcb->pcb_dr2;
1716 dbregs->dr[3] = pcb->pcb_dr3;
1717 dbregs->dr[6] = pcb->pcb_dr6;
1718 dbregs->dr[7] = pcb->pcb_dr7;
1719 }
1720 dbregs->dr[4] = 0;
1721 dbregs->dr[5] = 0;
1722 dbregs->dr[8] = 0;
1723 dbregs->dr[9] = 0;
1724 dbregs->dr[10] = 0;
1725 dbregs->dr[11] = 0;
1726 dbregs->dr[12] = 0;
1727 dbregs->dr[13] = 0;
1728 dbregs->dr[14] = 0;
1729 dbregs->dr[15] = 0;
1730 return (0);
1731 }
1732
1733 int
1734 set_dbregs(struct thread *td, struct dbreg *dbregs)
1735 {
1736 struct pcb *pcb;
1737 int i;
1738
1739 if (td == NULL) {
1740 load_dr0(dbregs->dr[0]);
1741 load_dr1(dbregs->dr[1]);
1742 load_dr2(dbregs->dr[2]);
1743 load_dr3(dbregs->dr[3]);
1744 load_dr6(dbregs->dr[6]);
1745 load_dr7(dbregs->dr[7]);
1746 } else {
1747 /*
1748 * Don't let an illegal value for dr7 get set. Specifically,
1749 * check for undefined settings. Setting these bit patterns
1750 * result in undefined behaviour and can lead to an unexpected
1751 * TRCTRAP or a general protection fault right here.
1752 * Upper bits of dr6 and dr7 must not be set
1753 */
1754 for (i = 0; i < 4; i++) {
1755 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
1756 return (EINVAL);
1757 if (td->td_frame->tf_cs == _ucode32sel &&
1758 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
1759 return (EINVAL);
1760 }
1761 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
1762 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
1763 return (EINVAL);
1764
1765 pcb = td->td_pcb;
1766
1767 /*
1768 * Don't let a process set a breakpoint that is not within the
1769 * process's address space. If a process could do this, it
1770 * could halt the system by setting a breakpoint in the kernel
1771 * (if ddb was enabled). Thus, we need to check to make sure
1772 * that no breakpoints are being enabled for addresses outside
1773 * process's address space.
1774 *
1775 * XXX - what about when the watched area of the user's
1776 * address space is written into from within the kernel
1777 * ... wouldn't that still cause a breakpoint to be generated
1778 * from within kernel mode?
1779 */
1780
1781 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
1782 /* dr0 is enabled */
1783 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
1784 return (EINVAL);
1785 }
1786 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
1787 /* dr1 is enabled */
1788 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
1789 return (EINVAL);
1790 }
1791 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
1792 /* dr2 is enabled */
1793 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
1794 return (EINVAL);
1795 }
1796 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
1797 /* dr3 is enabled */
1798 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
1799 return (EINVAL);
1800 }
1801
1802 pcb->pcb_dr0 = dbregs->dr[0];
1803 pcb->pcb_dr1 = dbregs->dr[1];
1804 pcb->pcb_dr2 = dbregs->dr[2];
1805 pcb->pcb_dr3 = dbregs->dr[3];
1806 pcb->pcb_dr6 = dbregs->dr[6];
1807 pcb->pcb_dr7 = dbregs->dr[7];
1808
1809 pcb->pcb_flags |= PCB_DBREGS;
1810 }
1811
1812 return (0);
1813 }
1814
1815 void
1816 reset_dbregs(void)
1817 {
1818
1819 load_dr7(0); /* Turn off the control bits first */
1820 load_dr0(0);
1821 load_dr1(0);
1822 load_dr2(0);
1823 load_dr3(0);
1824 load_dr6(0);
1825 }
1826
1827 /*
1828 * Return > 0 if a hardware breakpoint has been hit, and the
1829 * breakpoint was in user space. Return 0, otherwise.
1830 */
1831 int
1832 user_dbreg_trap(void)
1833 {
1834 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
1835 u_int64_t bp; /* breakpoint bits extracted from dr6 */
1836 int nbp; /* number of breakpoints that triggered */
1837 caddr_t addr[4]; /* breakpoint addresses */
1838 int i;
1839
1840 dr7 = rdr7();
1841 if ((dr7 & 0x000000ff) == 0) {
1842 /*
1843 * all GE and LE bits in the dr7 register are zero,
1844 * thus the trap couldn't have been caused by the
1845 * hardware debug registers
1846 */
1847 return 0;
1848 }
1849
1850 nbp = 0;
1851 dr6 = rdr6();
1852 bp = dr6 & 0x0000000f;
1853
1854 if (!bp) {
1855 /*
1856 * None of the breakpoint bits are set meaning this
1857 * trap was not caused by any of the debug registers
1858 */
1859 return 0;
1860 }
1861
1862 /*
1863 * at least one of the breakpoints were hit, check to see
1864 * which ones and if any of them are user space addresses
1865 */
1866
1867 if (bp & 0x01) {
1868 addr[nbp++] = (caddr_t)rdr0();
1869 }
1870 if (bp & 0x02) {
1871 addr[nbp++] = (caddr_t)rdr1();
1872 }
1873 if (bp & 0x04) {
1874 addr[nbp++] = (caddr_t)rdr2();
1875 }
1876 if (bp & 0x08) {
1877 addr[nbp++] = (caddr_t)rdr3();
1878 }
1879
1880 for (i = 0; i < nbp; i++) {
1881 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
1882 /*
1883 * addr[i] is in user space
1884 */
1885 return nbp;
1886 }
1887 }
1888
1889 /*
1890 * None of the breakpoints are in user space.
1891 */
1892 return 0;
1893 }
1894
1895 #ifdef KDB
1896
1897 /*
1898 * Provide inb() and outb() as functions. They are normally only
1899 * available as macros calling inlined functions, thus cannot be
1900 * called from the debugger.
1901 *
1902 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
1903 */
1904
1905 #undef inb
1906 #undef outb
1907
1908 /* silence compiler warnings */
1909 u_char inb(u_int);
1910 void outb(u_int, u_char);
1911
1912 u_char
1913 inb(u_int port)
1914 {
1915 u_char data;
1916 /*
1917 * We use %%dx and not %1 here because i/o is done at %dx and not at
1918 * %edx, while gcc generates inferior code (movw instead of movl)
1919 * if we tell it to load (u_short) port.
1920 */
1921 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
1922 return (data);
1923 }
1924
1925 void
1926 outb(u_int port, u_char data)
1927 {
1928 u_char al;
1929 /*
1930 * Use an unnecessary assignment to help gcc's register allocator.
1931 * This make a large difference for gcc-1.40 and a tiny difference
1932 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
1933 * best results. gcc-2.6.0 can't handle this.
1934 */
1935 al = data;
1936 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
1937 }
1938
1939 #endif /* KDB */
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