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: releng/8.1/sys/amd64/amd64/machdep.c 206890 2010-04-20 08:19:43Z kib $");
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 #include "opt_sched.h"
57
58 #include <sys/param.h>
59 #include <sys/proc.h>
60 #include <sys/systm.h>
61 #include <sys/bio.h>
62 #include <sys/buf.h>
63 #include <sys/bus.h>
64 #include <sys/callout.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 #include <ddb/ddb.h>
104 #include <ddb/db_sym.h>
105 #endif
106
107 #include <net/netisr.h>
108
109 #include <machine/clock.h>
110 #include <machine/cpu.h>
111 #include <machine/cputypes.h>
112 #include <machine/intr_machdep.h>
113 #include <machine/mca.h>
114 #include <machine/md_var.h>
115 #include <machine/metadata.h>
116 #include <machine/pc/bios.h>
117 #include <machine/pcb.h>
118 #include <machine/proc.h>
119 #include <machine/reg.h>
120 #include <machine/sigframe.h>
121 #include <machine/specialreg.h>
122 #ifdef PERFMON
123 #include <machine/perfmon.h>
124 #endif
125 #include <machine/tss.h>
126 #ifdef SMP
127 #include <machine/smp.h>
128 #endif
129
130 #ifdef DEV_ATPIC
131 #include <amd64/isa/icu.h>
132 #else
133 #include <machine/apicvar.h>
134 #endif
135
136 #include <isa/isareg.h>
137 #include <isa/rtc.h>
138
139 /* Sanity check for __curthread() */
140 CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
141
142 extern u_int64_t hammer_time(u_int64_t, u_int64_t);
143
144 extern void printcpuinfo(void); /* XXX header file */
145 extern void identify_cpu(void);
146 extern void panicifcpuunsupported(void);
147
148 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
149 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
150
151 static void cpu_startup(void *);
152 static void get_fpcontext(struct thread *td, mcontext_t *mcp);
153 static int set_fpcontext(struct thread *td, const mcontext_t *mcp);
154 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
155
156 #ifdef DDB
157 extern vm_offset_t ksym_start, ksym_end;
158 #endif
159
160 /* Intel ICH registers */
161 #define ICH_PMBASE 0x400
162 #define ICH_SMI_EN ICH_PMBASE + 0x30
163
164 int _udatasel, _ucodesel, _ucode32sel, _ufssel, _ugssel;
165
166 int cold = 1;
167
168 long Maxmem = 0;
169 long realmem = 0;
170
171 /*
172 * The number of PHYSMAP entries must be one less than the number of
173 * PHYSSEG entries because the PHYSMAP entry that spans the largest
174 * physical address that is accessible by ISA DMA is split into two
175 * PHYSSEG entries.
176 */
177 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
178
179 vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
180 vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
181
182 /* must be 2 less so 0 0 can signal end of chunks */
183 #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
184 #define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
185
186 struct kva_md_info kmi;
187
188 static struct trapframe proc0_tf;
189 struct region_descriptor r_gdt, r_idt;
190
191 struct pcpu __pcpu[MAXCPU];
192
193 struct mtx icu_lock;
194
195 struct mem_range_softc mem_range_softc;
196
197 struct mtx dt_lock; /* lock for GDT and LDT */
198
199 static void
200 cpu_startup(dummy)
201 void *dummy;
202 {
203 uintmax_t memsize;
204 char *sysenv;
205
206 /*
207 * On MacBooks, we need to disallow the legacy USB circuit to
208 * generate an SMI# because this can cause several problems,
209 * namely: incorrect CPU frequency detection and failure to
210 * start the APs.
211 * We do this by disabling a bit in the SMI_EN (SMI Control and
212 * Enable register) of the Intel ICH LPC Interface Bridge.
213 */
214 sysenv = getenv("smbios.system.product");
215 if (sysenv != NULL) {
216 if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
217 strncmp(sysenv, "MacBook3,1", 10) == 0 ||
218 strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
219 strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
220 strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
221 strncmp(sysenv, "Macmini1,1", 10) == 0) {
222 if (bootverbose)
223 printf("Disabling LEGACY_USB_EN bit on "
224 "Intel ICH.\n");
225 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8);
226 }
227 freeenv(sysenv);
228 }
229
230 /*
231 * Good {morning,afternoon,evening,night}.
232 */
233 startrtclock();
234 printcpuinfo();
235 panicifcpuunsupported();
236 #ifdef PERFMON
237 perfmon_init();
238 #endif
239 realmem = Maxmem;
240
241 /*
242 * Display physical memory if SMBIOS reports reasonable amount.
243 */
244 memsize = 0;
245 sysenv = getenv("smbios.memory.enabled");
246 if (sysenv != NULL) {
247 memsize = (uintmax_t)strtoul(sysenv, (char **)NULL, 10) << 10;
248 freeenv(sysenv);
249 }
250 if (memsize < ptoa((uintmax_t)cnt.v_free_count))
251 memsize = ptoa((uintmax_t)Maxmem);
252 printf("real memory = %ju (%ju MB)\n", memsize, memsize >> 20);
253
254 /*
255 * Display any holes after the first chunk of extended memory.
256 */
257 if (bootverbose) {
258 int indx;
259
260 printf("Physical memory chunk(s):\n");
261 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
262 vm_paddr_t size;
263
264 size = phys_avail[indx + 1] - phys_avail[indx];
265 printf(
266 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
267 (uintmax_t)phys_avail[indx],
268 (uintmax_t)phys_avail[indx + 1] - 1,
269 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
270 }
271 }
272
273 vm_ksubmap_init(&kmi);
274
275 printf("avail memory = %ju (%ju MB)\n",
276 ptoa((uintmax_t)cnt.v_free_count),
277 ptoa((uintmax_t)cnt.v_free_count) / 1048576);
278
279 /*
280 * Set up buffers, so they can be used to read disk labels.
281 */
282 bufinit();
283 vm_pager_bufferinit();
284
285 cpu_setregs();
286 mca_init();
287 }
288
289 /*
290 * Send an interrupt to process.
291 *
292 * Stack is set up to allow sigcode stored
293 * at top to call routine, followed by call
294 * to sigreturn routine below. After sigreturn
295 * resets the signal mask, the stack, and the
296 * frame pointer, it returns to the user
297 * specified pc, psl.
298 */
299 void
300 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
301 {
302 struct sigframe sf, *sfp;
303 struct proc *p;
304 struct thread *td;
305 struct sigacts *psp;
306 char *sp;
307 struct trapframe *regs;
308 int sig;
309 int oonstack;
310
311 td = curthread;
312 p = td->td_proc;
313 PROC_LOCK_ASSERT(p, MA_OWNED);
314 sig = ksi->ksi_signo;
315 psp = p->p_sigacts;
316 mtx_assert(&psp->ps_mtx, MA_OWNED);
317 regs = td->td_frame;
318 oonstack = sigonstack(regs->tf_rsp);
319
320 /* Save user context. */
321 bzero(&sf, sizeof(sf));
322 sf.sf_uc.uc_sigmask = *mask;
323 sf.sf_uc.uc_stack = td->td_sigstk;
324 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
325 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
326 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
327 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs));
328 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
329 get_fpcontext(td, &sf.sf_uc.uc_mcontext);
330 fpstate_drop(td);
331 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
332 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
333
334 /* Allocate space for the signal handler context. */
335 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
336 SIGISMEMBER(psp->ps_sigonstack, sig)) {
337 sp = td->td_sigstk.ss_sp +
338 td->td_sigstk.ss_size - sizeof(struct sigframe);
339 #if defined(COMPAT_43)
340 td->td_sigstk.ss_flags |= SS_ONSTACK;
341 #endif
342 } else
343 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
344 /* Align to 16 bytes. */
345 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul);
346
347 /* Translate the signal if appropriate. */
348 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
349 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
350
351 /* Build the argument list for the signal handler. */
352 regs->tf_rdi = sig; /* arg 1 in %rdi */
353 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */
354 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
355 /* Signal handler installed with SA_SIGINFO. */
356 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
357 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
358
359 /* Fill in POSIX parts */
360 sf.sf_si = ksi->ksi_info;
361 sf.sf_si.si_signo = sig; /* maybe a translated signal */
362 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
363 } else {
364 /* Old FreeBSD-style arguments. */
365 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */
366 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */
367 sf.sf_ahu.sf_handler = catcher;
368 }
369 mtx_unlock(&psp->ps_mtx);
370 PROC_UNLOCK(p);
371
372 /*
373 * Copy the sigframe out to the user's stack.
374 */
375 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
376 #ifdef DEBUG
377 printf("process %ld has trashed its stack\n", (long)p->p_pid);
378 #endif
379 PROC_LOCK(p);
380 sigexit(td, SIGILL);
381 }
382
383 regs->tf_rsp = (long)sfp;
384 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
385 regs->tf_rflags &= ~(PSL_T | PSL_D);
386 regs->tf_cs = _ucodesel;
387 regs->tf_ds = _udatasel;
388 regs->tf_es = _udatasel;
389 regs->tf_fs = _ufssel;
390 regs->tf_gs = _ugssel;
391 regs->tf_flags = TF_HASSEGS;
392 td->td_pcb->pcb_full_iret = 1;
393 PROC_LOCK(p);
394 mtx_lock(&psp->ps_mtx);
395 }
396
397 /*
398 * System call to cleanup state after a signal
399 * has been taken. Reset signal mask and
400 * stack state from context left by sendsig (above).
401 * Return to previous pc and psl as specified by
402 * context left by sendsig. Check carefully to
403 * make sure that the user has not modified the
404 * state to gain improper privileges.
405 *
406 * MPSAFE
407 */
408 int
409 sigreturn(td, uap)
410 struct thread *td;
411 struct sigreturn_args /* {
412 const struct __ucontext *sigcntxp;
413 } */ *uap;
414 {
415 ucontext_t uc;
416 struct proc *p = td->td_proc;
417 struct trapframe *regs;
418 ucontext_t *ucp;
419 long rflags;
420 int cs, error, ret;
421 ksiginfo_t ksi;
422
423 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
424 if (error != 0) {
425 uprintf("pid %d (%s): sigreturn copyin failed\n",
426 p->p_pid, td->td_name);
427 return (error);
428 }
429 ucp = &uc;
430 if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
431 uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
432 td->td_name, ucp->uc_mcontext.mc_flags);
433 return (EINVAL);
434 }
435 regs = td->td_frame;
436 rflags = ucp->uc_mcontext.mc_rflags;
437 /*
438 * Don't allow users to change privileged or reserved flags.
439 */
440 /*
441 * XXX do allow users to change the privileged flag PSL_RF.
442 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
443 * should sometimes set it there too. tf_rflags is kept in
444 * the signal context during signal handling and there is no
445 * other place to remember it, so the PSL_RF bit may be
446 * corrupted by the signal handler without us knowing.
447 * Corruption of the PSL_RF bit at worst causes one more or
448 * one less debugger trap, so allowing it is fairly harmless.
449 */
450 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
451 uprintf("pid %d (%s): sigreturn rflags = 0x%lx\n", p->p_pid,
452 td->td_name, rflags);
453 return (EINVAL);
454 }
455
456 /*
457 * Don't allow users to load a valid privileged %cs. Let the
458 * hardware check for invalid selectors, excess privilege in
459 * other selectors, invalid %eip's and invalid %esp's.
460 */
461 cs = ucp->uc_mcontext.mc_cs;
462 if (!CS_SECURE(cs)) {
463 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", p->p_pid,
464 td->td_name, cs);
465 ksiginfo_init_trap(&ksi);
466 ksi.ksi_signo = SIGBUS;
467 ksi.ksi_code = BUS_OBJERR;
468 ksi.ksi_trapno = T_PROTFLT;
469 ksi.ksi_addr = (void *)regs->tf_rip;
470 trapsignal(td, &ksi);
471 return (EINVAL);
472 }
473
474 ret = set_fpcontext(td, &ucp->uc_mcontext);
475 if (ret != 0) {
476 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
477 p->p_pid, td->td_name, ret);
478 return (ret);
479 }
480 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs));
481 td->td_pcb->pcb_fsbase = ucp->uc_mcontext.mc_fsbase;
482 td->td_pcb->pcb_gsbase = ucp->uc_mcontext.mc_gsbase;
483
484 #if defined(COMPAT_43)
485 if (ucp->uc_mcontext.mc_onstack & 1)
486 td->td_sigstk.ss_flags |= SS_ONSTACK;
487 else
488 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
489 #endif
490
491 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
492 td->td_pcb->pcb_flags |= PCB_FULLCTX;
493 td->td_pcb->pcb_full_iret = 1;
494 return (EJUSTRETURN);
495 }
496
497 #ifdef COMPAT_FREEBSD4
498 int
499 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
500 {
501
502 return sigreturn(td, (struct sigreturn_args *)uap);
503 }
504 #endif
505
506
507 /*
508 * Machine dependent boot() routine
509 *
510 * I haven't seen anything to put here yet
511 * Possibly some stuff might be grafted back here from boot()
512 */
513 void
514 cpu_boot(int howto)
515 {
516 }
517
518 /*
519 * Flush the D-cache for non-DMA I/O so that the I-cache can
520 * be made coherent later.
521 */
522 void
523 cpu_flush_dcache(void *ptr, size_t len)
524 {
525 /* Not applicable */
526 }
527
528 /* Get current clock frequency for the given cpu id. */
529 int
530 cpu_est_clockrate(int cpu_id, uint64_t *rate)
531 {
532 register_t reg;
533 uint64_t tsc1, tsc2;
534
535 if (pcpu_find(cpu_id) == NULL || rate == NULL)
536 return (EINVAL);
537
538 /* If we're booting, trust the rate calibrated moments ago. */
539 if (cold) {
540 *rate = tsc_freq;
541 return (0);
542 }
543
544 #ifdef SMP
545 /* Schedule ourselves on the indicated cpu. */
546 thread_lock(curthread);
547 sched_bind(curthread, cpu_id);
548 thread_unlock(curthread);
549 #endif
550
551 /* Calibrate by measuring a short delay. */
552 reg = intr_disable();
553 tsc1 = rdtsc();
554 DELAY(1000);
555 tsc2 = rdtsc();
556 intr_restore(reg);
557
558 #ifdef SMP
559 thread_lock(curthread);
560 sched_unbind(curthread);
561 thread_unlock(curthread);
562 #endif
563
564 /*
565 * Calculate the difference in readings, convert to Mhz, and
566 * subtract 0.5% of the total. Empirical testing has shown that
567 * overhead in DELAY() works out to approximately this value.
568 */
569 tsc2 -= tsc1;
570 *rate = tsc2 * 1000 - tsc2 * 5;
571 return (0);
572 }
573
574 /*
575 * Shutdown the CPU as much as possible
576 */
577 void
578 cpu_halt(void)
579 {
580 for (;;)
581 __asm__ ("hlt");
582 }
583
584 void (*cpu_idle_hook)(void) = NULL; /* ACPI idle hook. */
585
586 static void
587 cpu_idle_hlt(int busy)
588 {
589 /*
590 * we must absolutely guarentee that hlt is the next instruction
591 * after sti or we introduce a timing window.
592 */
593 disable_intr();
594 if (sched_runnable())
595 enable_intr();
596 else
597 __asm __volatile("sti; hlt");
598 }
599
600 static void
601 cpu_idle_acpi(int busy)
602 {
603 disable_intr();
604 if (sched_runnable())
605 enable_intr();
606 else if (cpu_idle_hook)
607 cpu_idle_hook();
608 else
609 __asm __volatile("sti; hlt");
610 }
611
612 static int cpu_ident_amdc1e = 0;
613
614 static int
615 cpu_probe_amdc1e(void)
616 {
617 int i;
618
619 /*
620 * Forget it, if we're not using local APIC timer.
621 */
622 if (resource_disabled("apic", 0) ||
623 (resource_int_value("apic", 0, "clock", &i) == 0 && i == 0))
624 return (0);
625
626 /*
627 * Detect the presence of C1E capability mostly on latest
628 * dual-cores (or future) k8 family.
629 */
630 if (cpu_vendor_id == CPU_VENDOR_AMD &&
631 (cpu_id & 0x00000f00) == 0x00000f00 &&
632 (cpu_id & 0x0fff0000) >= 0x00040000) {
633 cpu_ident_amdc1e = 1;
634 return (1);
635 }
636
637 return (0);
638 }
639
640 /*
641 * C1E renders the local APIC timer dead, so we disable it by
642 * reading the Interrupt Pending Message register and clearing
643 * both C1eOnCmpHalt (bit 28) and SmiOnCmpHalt (bit 27).
644 *
645 * Reference:
646 * "BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors"
647 * #32559 revision 3.00+
648 */
649 #define MSR_AMDK8_IPM 0xc0010055
650 #define AMDK8_SMIONCMPHALT (1ULL << 27)
651 #define AMDK8_C1EONCMPHALT (1ULL << 28)
652 #define AMDK8_CMPHALT (AMDK8_SMIONCMPHALT | AMDK8_C1EONCMPHALT)
653
654 static void
655 cpu_idle_amdc1e(int busy)
656 {
657
658 disable_intr();
659 if (sched_runnable())
660 enable_intr();
661 else {
662 uint64_t msr;
663
664 msr = rdmsr(MSR_AMDK8_IPM);
665 if (msr & AMDK8_CMPHALT)
666 wrmsr(MSR_AMDK8_IPM, msr & ~AMDK8_CMPHALT);
667
668 if (cpu_idle_hook)
669 cpu_idle_hook();
670 else
671 __asm __volatile("sti; hlt");
672 }
673 }
674
675 static void
676 cpu_idle_spin(int busy)
677 {
678 return;
679 }
680
681 void (*cpu_idle_fn)(int) = cpu_idle_acpi;
682
683 void
684 cpu_idle(int busy)
685 {
686 #ifdef SMP
687 if (mp_grab_cpu_hlt())
688 return;
689 #endif
690 cpu_idle_fn(busy);
691 }
692
693 /*
694 * mwait cpu power states. Lower 4 bits are sub-states.
695 */
696 #define MWAIT_C0 0xf0
697 #define MWAIT_C1 0x00
698 #define MWAIT_C2 0x10
699 #define MWAIT_C3 0x20
700 #define MWAIT_C4 0x30
701
702 #define MWAIT_DISABLED 0x0
703 #define MWAIT_WOKEN 0x1
704 #define MWAIT_WAITING 0x2
705
706 static void
707 cpu_idle_mwait(int busy)
708 {
709 int *mwait;
710
711 mwait = (int *)PCPU_PTR(monitorbuf);
712 *mwait = MWAIT_WAITING;
713 if (sched_runnable())
714 return;
715 cpu_monitor(mwait, 0, 0);
716 if (*mwait == MWAIT_WAITING)
717 cpu_mwait(0, MWAIT_C1);
718 }
719
720 static void
721 cpu_idle_mwait_hlt(int busy)
722 {
723 int *mwait;
724
725 mwait = (int *)PCPU_PTR(monitorbuf);
726 if (busy == 0) {
727 *mwait = MWAIT_DISABLED;
728 cpu_idle_hlt(busy);
729 return;
730 }
731 *mwait = MWAIT_WAITING;
732 if (sched_runnable())
733 return;
734 cpu_monitor(mwait, 0, 0);
735 if (*mwait == MWAIT_WAITING)
736 cpu_mwait(0, MWAIT_C1);
737 }
738
739 int
740 cpu_idle_wakeup(int cpu)
741 {
742 struct pcpu *pcpu;
743 int *mwait;
744
745 if (cpu_idle_fn == cpu_idle_spin)
746 return (1);
747 if (cpu_idle_fn != cpu_idle_mwait && cpu_idle_fn != cpu_idle_mwait_hlt)
748 return (0);
749 pcpu = pcpu_find(cpu);
750 mwait = (int *)pcpu->pc_monitorbuf;
751 /*
752 * This doesn't need to be atomic since missing the race will
753 * simply result in unnecessary IPIs.
754 */
755 if (cpu_idle_fn == cpu_idle_mwait_hlt && *mwait == MWAIT_DISABLED)
756 return (0);
757 *mwait = MWAIT_WOKEN;
758
759 return (1);
760 }
761
762 /*
763 * Ordered by speed/power consumption.
764 */
765 struct {
766 void *id_fn;
767 char *id_name;
768 } idle_tbl[] = {
769 { cpu_idle_spin, "spin" },
770 { cpu_idle_mwait, "mwait" },
771 { cpu_idle_mwait_hlt, "mwait_hlt" },
772 { cpu_idle_amdc1e, "amdc1e" },
773 { cpu_idle_hlt, "hlt" },
774 { cpu_idle_acpi, "acpi" },
775 { NULL, NULL }
776 };
777
778 static int
779 idle_sysctl_available(SYSCTL_HANDLER_ARGS)
780 {
781 char *avail, *p;
782 int error;
783 int i;
784
785 avail = malloc(256, M_TEMP, M_WAITOK);
786 p = avail;
787 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
788 if (strstr(idle_tbl[i].id_name, "mwait") &&
789 (cpu_feature2 & CPUID2_MON) == 0)
790 continue;
791 if (strcmp(idle_tbl[i].id_name, "amdc1e") == 0 &&
792 cpu_ident_amdc1e == 0)
793 continue;
794 p += sprintf(p, "%s, ", idle_tbl[i].id_name);
795 }
796 error = sysctl_handle_string(oidp, avail, 0, req);
797 free(avail, M_TEMP);
798 return (error);
799 }
800
801 static int
802 idle_sysctl(SYSCTL_HANDLER_ARGS)
803 {
804 char buf[16];
805 int error;
806 char *p;
807 int i;
808
809 p = "unknown";
810 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
811 if (idle_tbl[i].id_fn == cpu_idle_fn) {
812 p = idle_tbl[i].id_name;
813 break;
814 }
815 }
816 strncpy(buf, p, sizeof(buf));
817 error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
818 if (error != 0 || req->newptr == NULL)
819 return (error);
820 for (i = 0; idle_tbl[i].id_name != NULL; i++) {
821 if (strstr(idle_tbl[i].id_name, "mwait") &&
822 (cpu_feature2 & CPUID2_MON) == 0)
823 continue;
824 if (strcmp(idle_tbl[i].id_name, "amdc1e") == 0 &&
825 cpu_ident_amdc1e == 0)
826 continue;
827 if (strcmp(idle_tbl[i].id_name, buf))
828 continue;
829 cpu_idle_fn = idle_tbl[i].id_fn;
830 return (0);
831 }
832 return (EINVAL);
833 }
834
835 SYSCTL_PROC(_machdep, OID_AUTO, idle_available, CTLTYPE_STRING | CTLFLAG_RD,
836 0, 0, idle_sysctl_available, "A", "list of available idle functions");
837
838 SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
839 idle_sysctl, "A", "currently selected idle function");
840
841 /*
842 * Reset registers to default values on exec.
843 */
844 void
845 exec_setregs(td, entry, stack, ps_strings)
846 struct thread *td;
847 u_long entry;
848 u_long stack;
849 u_long ps_strings;
850 {
851 struct trapframe *regs = td->td_frame;
852 struct pcb *pcb = td->td_pcb;
853
854 mtx_lock(&dt_lock);
855 if (td->td_proc->p_md.md_ldt != NULL)
856 user_ldt_free(td);
857 else
858 mtx_unlock(&dt_lock);
859
860 pcb->pcb_fsbase = 0;
861 pcb->pcb_gsbase = 0;
862 pcb->pcb_flags &= ~(PCB_32BIT | PCB_GS32BIT);
863 pcb->pcb_initial_fpucw = __INITIAL_FPUCW__;
864 pcb->pcb_full_iret = 1;
865
866 bzero((char *)regs, sizeof(struct trapframe));
867 regs->tf_rip = entry;
868 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8;
869 regs->tf_rdi = stack; /* argv */
870 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
871 regs->tf_ss = _udatasel;
872 regs->tf_cs = _ucodesel;
873 regs->tf_ds = _udatasel;
874 regs->tf_es = _udatasel;
875 regs->tf_fs = _ufssel;
876 regs->tf_gs = _ugssel;
877 regs->tf_flags = TF_HASSEGS;
878
879 /*
880 * Reset the hardware debug registers if they were in use.
881 * They won't have any meaning for the newly exec'd process.
882 */
883 if (pcb->pcb_flags & PCB_DBREGS) {
884 pcb->pcb_dr0 = 0;
885 pcb->pcb_dr1 = 0;
886 pcb->pcb_dr2 = 0;
887 pcb->pcb_dr3 = 0;
888 pcb->pcb_dr6 = 0;
889 pcb->pcb_dr7 = 0;
890 if (pcb == PCPU_GET(curpcb)) {
891 /*
892 * Clear the debug registers on the running
893 * CPU, otherwise they will end up affecting
894 * the next process we switch to.
895 */
896 reset_dbregs();
897 }
898 pcb->pcb_flags &= ~PCB_DBREGS;
899 }
900
901 /*
902 * Drop the FP state if we hold it, so that the process gets a
903 * clean FP state if it uses the FPU again.
904 */
905 fpstate_drop(td);
906 }
907
908 void
909 cpu_setregs(void)
910 {
911 register_t cr0;
912
913 cr0 = rcr0();
914 /*
915 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the
916 * BSP. See the comments there about why we set them.
917 */
918 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
919 load_cr0(cr0);
920 }
921
922 /*
923 * Initialize amd64 and configure to run kernel
924 */
925
926 /*
927 * Initialize segments & interrupt table
928 */
929
930 struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */
931 static struct gate_descriptor idt0[NIDT];
932 struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
933
934 static char dblfault_stack[PAGE_SIZE] __aligned(16);
935
936 static char nmi0_stack[PAGE_SIZE] __aligned(16);
937 CTASSERT(sizeof(struct nmi_pcpu) == 16);
938
939 struct amd64tss common_tss[MAXCPU];
940
941 /*
942 * Software prototypes -- in more palatable form.
943 *
944 * Keep GUFS32, GUGS32, GUCODE32 and GUDATA at the same
945 * slots as corresponding segments for i386 kernel.
946 */
947 struct soft_segment_descriptor gdt_segs[] = {
948 /* GNULL_SEL 0 Null Descriptor */
949 { .ssd_base = 0x0,
950 .ssd_limit = 0x0,
951 .ssd_type = 0,
952 .ssd_dpl = 0,
953 .ssd_p = 0,
954 .ssd_long = 0,
955 .ssd_def32 = 0,
956 .ssd_gran = 0 },
957 /* GNULL2_SEL 1 Null Descriptor */
958 { .ssd_base = 0x0,
959 .ssd_limit = 0x0,
960 .ssd_type = 0,
961 .ssd_dpl = 0,
962 .ssd_p = 0,
963 .ssd_long = 0,
964 .ssd_def32 = 0,
965 .ssd_gran = 0 },
966 /* GUFS32_SEL 2 32 bit %gs Descriptor for user */
967 { .ssd_base = 0x0,
968 .ssd_limit = 0xfffff,
969 .ssd_type = SDT_MEMRWA,
970 .ssd_dpl = SEL_UPL,
971 .ssd_p = 1,
972 .ssd_long = 0,
973 .ssd_def32 = 1,
974 .ssd_gran = 1 },
975 /* GUGS32_SEL 3 32 bit %fs Descriptor for user */
976 { .ssd_base = 0x0,
977 .ssd_limit = 0xfffff,
978 .ssd_type = SDT_MEMRWA,
979 .ssd_dpl = SEL_UPL,
980 .ssd_p = 1,
981 .ssd_long = 0,
982 .ssd_def32 = 1,
983 .ssd_gran = 1 },
984 /* GCODE_SEL 4 Code Descriptor for kernel */
985 { .ssd_base = 0x0,
986 .ssd_limit = 0xfffff,
987 .ssd_type = SDT_MEMERA,
988 .ssd_dpl = SEL_KPL,
989 .ssd_p = 1,
990 .ssd_long = 1,
991 .ssd_def32 = 0,
992 .ssd_gran = 1 },
993 /* GDATA_SEL 5 Data Descriptor for kernel */
994 { .ssd_base = 0x0,
995 .ssd_limit = 0xfffff,
996 .ssd_type = SDT_MEMRWA,
997 .ssd_dpl = SEL_KPL,
998 .ssd_p = 1,
999 .ssd_long = 1,
1000 .ssd_def32 = 0,
1001 .ssd_gran = 1 },
1002 /* GUCODE32_SEL 6 32 bit Code Descriptor for user */
1003 { .ssd_base = 0x0,
1004 .ssd_limit = 0xfffff,
1005 .ssd_type = SDT_MEMERA,
1006 .ssd_dpl = SEL_UPL,
1007 .ssd_p = 1,
1008 .ssd_long = 0,
1009 .ssd_def32 = 1,
1010 .ssd_gran = 1 },
1011 /* GUDATA_SEL 7 32/64 bit Data Descriptor for user */
1012 { .ssd_base = 0x0,
1013 .ssd_limit = 0xfffff,
1014 .ssd_type = SDT_MEMRWA,
1015 .ssd_dpl = SEL_UPL,
1016 .ssd_p = 1,
1017 .ssd_long = 0,
1018 .ssd_def32 = 1,
1019 .ssd_gran = 1 },
1020 /* GUCODE_SEL 8 64 bit Code Descriptor for user */
1021 { .ssd_base = 0x0,
1022 .ssd_limit = 0xfffff,
1023 .ssd_type = SDT_MEMERA,
1024 .ssd_dpl = SEL_UPL,
1025 .ssd_p = 1,
1026 .ssd_long = 1,
1027 .ssd_def32 = 0,
1028 .ssd_gran = 1 },
1029 /* GPROC0_SEL 9 Proc 0 Tss Descriptor */
1030 { .ssd_base = 0x0,
1031 .ssd_limit = sizeof(struct amd64tss) + IOPAGES * PAGE_SIZE - 1,
1032 .ssd_type = SDT_SYSTSS,
1033 .ssd_dpl = SEL_KPL,
1034 .ssd_p = 1,
1035 .ssd_long = 0,
1036 .ssd_def32 = 0,
1037 .ssd_gran = 0 },
1038 /* Actually, the TSS is a system descriptor which is double size */
1039 { .ssd_base = 0x0,
1040 .ssd_limit = 0x0,
1041 .ssd_type = 0,
1042 .ssd_dpl = 0,
1043 .ssd_p = 0,
1044 .ssd_long = 0,
1045 .ssd_def32 = 0,
1046 .ssd_gran = 0 },
1047 /* GUSERLDT_SEL 11 LDT Descriptor */
1048 { .ssd_base = 0x0,
1049 .ssd_limit = 0x0,
1050 .ssd_type = 0,
1051 .ssd_dpl = 0,
1052 .ssd_p = 0,
1053 .ssd_long = 0,
1054 .ssd_def32 = 0,
1055 .ssd_gran = 0 },
1056 /* GUSERLDT_SEL 12 LDT Descriptor, double size */
1057 { .ssd_base = 0x0,
1058 .ssd_limit = 0x0,
1059 .ssd_type = 0,
1060 .ssd_dpl = 0,
1061 .ssd_p = 0,
1062 .ssd_long = 0,
1063 .ssd_def32 = 0,
1064 .ssd_gran = 0 },
1065 };
1066
1067 void
1068 setidt(idx, func, typ, dpl, ist)
1069 int idx;
1070 inthand_t *func;
1071 int typ;
1072 int dpl;
1073 int ist;
1074 {
1075 struct gate_descriptor *ip;
1076
1077 ip = idt + idx;
1078 ip->gd_looffset = (uintptr_t)func;
1079 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL);
1080 ip->gd_ist = ist;
1081 ip->gd_xx = 0;
1082 ip->gd_type = typ;
1083 ip->gd_dpl = dpl;
1084 ip->gd_p = 1;
1085 ip->gd_hioffset = ((uintptr_t)func)>>16 ;
1086 }
1087
1088 extern inthand_t
1089 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1090 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1091 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1092 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1093 IDTVEC(xmm), IDTVEC(dblfault),
1094 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
1095
1096 #ifdef DDB
1097 /*
1098 * Display the index and function name of any IDT entries that don't use
1099 * the default 'rsvd' entry point.
1100 */
1101 DB_SHOW_COMMAND(idt, db_show_idt)
1102 {
1103 struct gate_descriptor *ip;
1104 int idx;
1105 uintptr_t func;
1106
1107 ip = idt;
1108 for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
1109 func = ((long)ip->gd_hioffset << 16 | ip->gd_looffset);
1110 if (func != (uintptr_t)&IDTVEC(rsvd)) {
1111 db_printf("%3d\t", idx);
1112 db_printsym(func, DB_STGY_PROC);
1113 db_printf("\n");
1114 }
1115 ip++;
1116 }
1117 }
1118 #endif
1119
1120 void
1121 sdtossd(sd, ssd)
1122 struct user_segment_descriptor *sd;
1123 struct soft_segment_descriptor *ssd;
1124 {
1125
1126 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1127 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1128 ssd->ssd_type = sd->sd_type;
1129 ssd->ssd_dpl = sd->sd_dpl;
1130 ssd->ssd_p = sd->sd_p;
1131 ssd->ssd_long = sd->sd_long;
1132 ssd->ssd_def32 = sd->sd_def32;
1133 ssd->ssd_gran = sd->sd_gran;
1134 }
1135
1136 void
1137 ssdtosd(ssd, sd)
1138 struct soft_segment_descriptor *ssd;
1139 struct user_segment_descriptor *sd;
1140 {
1141
1142 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1143 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff;
1144 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1145 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1146 sd->sd_type = ssd->ssd_type;
1147 sd->sd_dpl = ssd->ssd_dpl;
1148 sd->sd_p = ssd->ssd_p;
1149 sd->sd_long = ssd->ssd_long;
1150 sd->sd_def32 = ssd->ssd_def32;
1151 sd->sd_gran = ssd->ssd_gran;
1152 }
1153
1154 void
1155 ssdtosyssd(ssd, sd)
1156 struct soft_segment_descriptor *ssd;
1157 struct system_segment_descriptor *sd;
1158 {
1159
1160 sd->sd_lobase = (ssd->ssd_base) & 0xffffff;
1161 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful;
1162 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff;
1163 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf;
1164 sd->sd_type = ssd->ssd_type;
1165 sd->sd_dpl = ssd->ssd_dpl;
1166 sd->sd_p = ssd->ssd_p;
1167 sd->sd_gran = ssd->ssd_gran;
1168 }
1169
1170 #if !defined(DEV_ATPIC) && defined(DEV_ISA)
1171 #include <isa/isavar.h>
1172 #include <isa/isareg.h>
1173 /*
1174 * Return a bitmap of the current interrupt requests. This is 8259-specific
1175 * and is only suitable for use at probe time.
1176 * This is only here to pacify sio. It is NOT FATAL if this doesn't work.
1177 * It shouldn't be here. There should probably be an APIC centric
1178 * implementation in the apic driver code, if at all.
1179 */
1180 intrmask_t
1181 isa_irq_pending(void)
1182 {
1183 u_char irr1;
1184 u_char irr2;
1185
1186 irr1 = inb(IO_ICU1);
1187 irr2 = inb(IO_ICU2);
1188 return ((irr2 << 8) | irr1);
1189 }
1190 #endif
1191
1192 u_int basemem;
1193
1194 static int
1195 add_smap_entry(struct bios_smap *smap, vm_paddr_t *physmap, int *physmap_idxp)
1196 {
1197 int i, insert_idx, physmap_idx;
1198
1199 physmap_idx = *physmap_idxp;
1200
1201 if (boothowto & RB_VERBOSE)
1202 printf("SMAP type=%02x base=%016lx len=%016lx\n",
1203 smap->type, smap->base, smap->length);
1204
1205 if (smap->type != SMAP_TYPE_MEMORY)
1206 return (1);
1207
1208 if (smap->length == 0)
1209 return (0);
1210
1211 /*
1212 * Find insertion point while checking for overlap. Start off by
1213 * assuming the new entry will be added to the end.
1214 */
1215 insert_idx = physmap_idx + 2;
1216 for (i = 0; i <= physmap_idx; i += 2) {
1217 if (smap->base < physmap[i + 1]) {
1218 if (smap->base + smap->length <= physmap[i]) {
1219 insert_idx = i;
1220 break;
1221 }
1222 if (boothowto & RB_VERBOSE)
1223 printf(
1224 "Overlapping memory regions, ignoring second region\n");
1225 return (1);
1226 }
1227 }
1228
1229 /* See if we can prepend to the next entry. */
1230 if (insert_idx <= physmap_idx &&
1231 smap->base + smap->length == physmap[insert_idx]) {
1232 physmap[insert_idx] = smap->base;
1233 return (1);
1234 }
1235
1236 /* See if we can append to the previous entry. */
1237 if (insert_idx > 0 && smap->base == physmap[insert_idx - 1]) {
1238 physmap[insert_idx - 1] += smap->length;
1239 return (1);
1240 }
1241
1242 physmap_idx += 2;
1243 *physmap_idxp = physmap_idx;
1244 if (physmap_idx == PHYSMAP_SIZE) {
1245 printf(
1246 "Too many segments in the physical address map, giving up\n");
1247 return (0);
1248 }
1249
1250 /*
1251 * Move the last 'N' entries down to make room for the new
1252 * entry if needed.
1253 */
1254 for (i = physmap_idx; i > insert_idx; i -= 2) {
1255 physmap[i] = physmap[i - 2];
1256 physmap[i + 1] = physmap[i - 1];
1257 }
1258
1259 /* Insert the new entry. */
1260 physmap[insert_idx] = smap->base;
1261 physmap[insert_idx + 1] = smap->base + smap->length;
1262 return (1);
1263 }
1264
1265 /*
1266 * Populate the (physmap) array with base/bound pairs describing the
1267 * available physical memory in the system, then test this memory and
1268 * build the phys_avail array describing the actually-available memory.
1269 *
1270 * If we cannot accurately determine the physical memory map, then use
1271 * value from the 0xE801 call, and failing that, the RTC.
1272 *
1273 * Total memory size may be set by the kernel environment variable
1274 * hw.physmem or the compile-time define MAXMEM.
1275 *
1276 * XXX first should be vm_paddr_t.
1277 */
1278 static void
1279 getmemsize(caddr_t kmdp, u_int64_t first)
1280 {
1281 int i, off, physmap_idx, pa_indx, da_indx;
1282 vm_paddr_t pa, physmap[PHYSMAP_SIZE];
1283 u_long physmem_tunable;
1284 pt_entry_t *pte;
1285 struct bios_smap *smapbase, *smap, *smapend;
1286 u_int32_t smapsize;
1287 quad_t dcons_addr, dcons_size;
1288
1289 bzero(physmap, sizeof(physmap));
1290 basemem = 0;
1291 physmap_idx = 0;
1292
1293 /*
1294 * get memory map from INT 15:E820, kindly supplied by the loader.
1295 *
1296 * subr_module.c says:
1297 * "Consumer may safely assume that size value precedes data."
1298 * ie: an int32_t immediately precedes smap.
1299 */
1300 smapbase = (struct bios_smap *)preload_search_info(kmdp,
1301 MODINFO_METADATA | MODINFOMD_SMAP);
1302 if (smapbase == NULL)
1303 panic("No BIOS smap info from loader!");
1304
1305 smapsize = *((u_int32_t *)smapbase - 1);
1306 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize);
1307
1308 for (smap = smapbase; smap < smapend; smap++)
1309 if (!add_smap_entry(smap, physmap, &physmap_idx))
1310 break;
1311
1312 /*
1313 * Find the 'base memory' segment for SMP
1314 */
1315 basemem = 0;
1316 for (i = 0; i <= physmap_idx; i += 2) {
1317 if (physmap[i] == 0x00000000) {
1318 basemem = physmap[i + 1] / 1024;
1319 break;
1320 }
1321 }
1322 if (basemem == 0)
1323 panic("BIOS smap did not include a basemem segment!");
1324
1325 #ifdef SMP
1326 /* make hole for AP bootstrap code */
1327 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1328 #endif
1329
1330 /*
1331 * Maxmem isn't the "maximum memory", it's one larger than the
1332 * highest page of the physical address space. It should be
1333 * called something like "Maxphyspage". We may adjust this
1334 * based on ``hw.physmem'' and the results of the memory test.
1335 */
1336 Maxmem = atop(physmap[physmap_idx + 1]);
1337
1338 #ifdef MAXMEM
1339 Maxmem = MAXMEM / 4;
1340 #endif
1341
1342 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
1343 Maxmem = atop(physmem_tunable);
1344
1345 /*
1346 * Don't allow MAXMEM or hw.physmem to extend the amount of memory
1347 * in the system.
1348 */
1349 if (Maxmem > atop(physmap[physmap_idx + 1]))
1350 Maxmem = atop(physmap[physmap_idx + 1]);
1351
1352 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1353 (boothowto & RB_VERBOSE))
1354 printf("Physical memory use set to %ldK\n", Maxmem * 4);
1355
1356 /* call pmap initialization to make new kernel address space */
1357 pmap_bootstrap(&first);
1358
1359 /*
1360 * Size up each available chunk of physical memory.
1361 */
1362 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1363 pa_indx = 0;
1364 da_indx = 1;
1365 phys_avail[pa_indx++] = physmap[0];
1366 phys_avail[pa_indx] = physmap[0];
1367 dump_avail[da_indx] = physmap[0];
1368 pte = CMAP1;
1369
1370 /*
1371 * Get dcons buffer address
1372 */
1373 if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
1374 getenv_quad("dcons.size", &dcons_size) == 0)
1375 dcons_addr = 0;
1376
1377 /*
1378 * physmap is in bytes, so when converting to page boundaries,
1379 * round up the start address and round down the end address.
1380 */
1381 for (i = 0; i <= physmap_idx; i += 2) {
1382 vm_paddr_t end;
1383
1384 end = ptoa((vm_paddr_t)Maxmem);
1385 if (physmap[i + 1] < end)
1386 end = trunc_page(physmap[i + 1]);
1387 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1388 int tmp, page_bad, full;
1389 int *ptr = (int *)CADDR1;
1390
1391 full = FALSE;
1392 /*
1393 * block out kernel memory as not available.
1394 */
1395 if (pa >= 0x100000 && pa < first)
1396 goto do_dump_avail;
1397
1398 /*
1399 * block out dcons buffer
1400 */
1401 if (dcons_addr > 0
1402 && pa >= trunc_page(dcons_addr)
1403 && pa < dcons_addr + dcons_size)
1404 goto do_dump_avail;
1405
1406 page_bad = FALSE;
1407
1408 /*
1409 * map page into kernel: valid, read/write,non-cacheable
1410 */
1411 *pte = pa | PG_V | PG_RW | PG_N;
1412 invltlb();
1413
1414 tmp = *(int *)ptr;
1415 /*
1416 * Test for alternating 1's and 0's
1417 */
1418 *(volatile int *)ptr = 0xaaaaaaaa;
1419 if (*(volatile int *)ptr != 0xaaaaaaaa)
1420 page_bad = TRUE;
1421 /*
1422 * Test for alternating 0's and 1's
1423 */
1424 *(volatile int *)ptr = 0x55555555;
1425 if (*(volatile int *)ptr != 0x55555555)
1426 page_bad = TRUE;
1427 /*
1428 * Test for all 1's
1429 */
1430 *(volatile int *)ptr = 0xffffffff;
1431 if (*(volatile int *)ptr != 0xffffffff)
1432 page_bad = TRUE;
1433 /*
1434 * Test for all 0's
1435 */
1436 *(volatile int *)ptr = 0x0;
1437 if (*(volatile int *)ptr != 0x0)
1438 page_bad = TRUE;
1439 /*
1440 * Restore original value.
1441 */
1442 *(int *)ptr = tmp;
1443
1444 /*
1445 * Adjust array of valid/good pages.
1446 */
1447 if (page_bad == TRUE)
1448 continue;
1449 /*
1450 * If this good page is a continuation of the
1451 * previous set of good pages, then just increase
1452 * the end pointer. Otherwise start a new chunk.
1453 * Note that "end" points one higher than end,
1454 * making the range >= start and < end.
1455 * If we're also doing a speculative memory
1456 * test and we at or past the end, bump up Maxmem
1457 * so that we keep going. The first bad page
1458 * will terminate the loop.
1459 */
1460 if (phys_avail[pa_indx] == pa) {
1461 phys_avail[pa_indx] += PAGE_SIZE;
1462 } else {
1463 pa_indx++;
1464 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1465 printf(
1466 "Too many holes in the physical address space, giving up\n");
1467 pa_indx--;
1468 full = TRUE;
1469 goto do_dump_avail;
1470 }
1471 phys_avail[pa_indx++] = pa; /* start */
1472 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1473 }
1474 physmem++;
1475 do_dump_avail:
1476 if (dump_avail[da_indx] == pa) {
1477 dump_avail[da_indx] += PAGE_SIZE;
1478 } else {
1479 da_indx++;
1480 if (da_indx == DUMP_AVAIL_ARRAY_END) {
1481 da_indx--;
1482 goto do_next;
1483 }
1484 dump_avail[da_indx++] = pa; /* start */
1485 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
1486 }
1487 do_next:
1488 if (full)
1489 break;
1490 }
1491 }
1492 *pte = 0;
1493 invltlb();
1494
1495 /*
1496 * XXX
1497 * The last chunk must contain at least one page plus the message
1498 * buffer to avoid complicating other code (message buffer address
1499 * calculation, etc.).
1500 */
1501 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1502 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1503 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1504 phys_avail[pa_indx--] = 0;
1505 phys_avail[pa_indx--] = 0;
1506 }
1507
1508 Maxmem = atop(phys_avail[pa_indx]);
1509
1510 /* Trim off space for the message buffer. */
1511 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1512
1513 /* Map the message buffer. */
1514 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
1515 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
1516 off);
1517 }
1518
1519 u_int64_t
1520 hammer_time(u_int64_t modulep, u_int64_t physfree)
1521 {
1522 caddr_t kmdp;
1523 int gsel_tss, x;
1524 struct pcpu *pc;
1525 struct nmi_pcpu *np;
1526 u_int64_t msr;
1527 char *env;
1528
1529 thread0.td_kstack = physfree + KERNBASE;
1530 bzero((void *)thread0.td_kstack, KSTACK_PAGES * PAGE_SIZE);
1531 physfree += KSTACK_PAGES * PAGE_SIZE;
1532 thread0.td_pcb = (struct pcb *)
1533 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
1534
1535 /*
1536 * This may be done better later if it gets more high level
1537 * components in it. If so just link td->td_proc here.
1538 */
1539 proc_linkup0(&proc0, &thread0);
1540
1541 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
1542 preload_bootstrap_relocate(KERNBASE);
1543 kmdp = preload_search_by_type("elf kernel");
1544 if (kmdp == NULL)
1545 kmdp = preload_search_by_type("elf64 kernel");
1546 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
1547 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
1548 #ifdef DDB
1549 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
1550 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
1551 #endif
1552
1553 /* Init basic tunables, hz etc */
1554 init_param1();
1555
1556 /*
1557 * make gdt memory segments
1558 */
1559 for (x = 0; x < NGDT; x++) {
1560 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
1561 x != GUSERLDT_SEL && x != (GUSERLDT_SEL) + 1)
1562 ssdtosd(&gdt_segs[x], &gdt[x]);
1563 }
1564 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0];
1565 ssdtosyssd(&gdt_segs[GPROC0_SEL],
1566 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1567
1568 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1569 r_gdt.rd_base = (long) gdt;
1570 lgdt(&r_gdt);
1571 pc = &__pcpu[0];
1572
1573 wrmsr(MSR_FSBASE, 0); /* User value */
1574 wrmsr(MSR_GSBASE, (u_int64_t)pc);
1575 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */
1576
1577 pcpu_init(pc, 0, sizeof(struct pcpu));
1578 dpcpu_init((void *)(physfree + KERNBASE), 0);
1579 physfree += DPCPU_SIZE;
1580 PCPU_SET(prvspace, pc);
1581 PCPU_SET(curthread, &thread0);
1582 PCPU_SET(curpcb, thread0.td_pcb);
1583 PCPU_SET(tssp, &common_tss[0]);
1584 PCPU_SET(commontssp, &common_tss[0]);
1585 PCPU_SET(tss, (struct system_segment_descriptor *)&gdt[GPROC0_SEL]);
1586 PCPU_SET(ldt, (struct system_segment_descriptor *)&gdt[GUSERLDT_SEL]);
1587 PCPU_SET(fs32p, &gdt[GUFS32_SEL]);
1588 PCPU_SET(gs32p, &gdt[GUGS32_SEL]);
1589
1590 /*
1591 * Initialize mutexes.
1592 *
1593 * icu_lock: in order to allow an interrupt to occur in a critical
1594 * section, to set pcpu->ipending (etc...) properly, we
1595 * must be able to get the icu lock, so it can't be
1596 * under witness.
1597 */
1598 mutex_init();
1599 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS);
1600 mtx_init(&dt_lock, "descriptor tables", NULL, MTX_DEF);
1601
1602 /* exceptions */
1603 for (x = 0; x < NIDT; x++)
1604 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0);
1605 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0);
1606 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0);
1607 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 2);
1608 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0);
1609 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0);
1610 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0);
1611 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0);
1612 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0);
1613 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1);
1614 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0);
1615 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0);
1616 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0);
1617 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0);
1618 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0);
1619 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0);
1620 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0);
1621 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
1622 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
1623 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
1624
1625 r_idt.rd_limit = sizeof(idt0) - 1;
1626 r_idt.rd_base = (long) idt;
1627 lidt(&r_idt);
1628
1629 /*
1630 * Initialize the i8254 before the console so that console
1631 * initialization can use DELAY().
1632 */
1633 i8254_init();
1634
1635 /*
1636 * Initialize the console before we print anything out.
1637 */
1638 cninit();
1639
1640 #ifdef DEV_ISA
1641 #ifdef DEV_ATPIC
1642 elcr_probe();
1643 atpic_startup();
1644 #else
1645 /* Reset and mask the atpics and leave them shut down. */
1646 atpic_reset();
1647
1648 /*
1649 * Point the ICU spurious interrupt vectors at the APIC spurious
1650 * interrupt handler.
1651 */
1652 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1653 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0);
1654 #endif
1655 #else
1656 #error "have you forgotten the isa device?";
1657 #endif
1658
1659 kdb_init();
1660
1661 #ifdef KDB
1662 if (boothowto & RB_KDB)
1663 kdb_enter(KDB_WHY_BOOTFLAGS,
1664 "Boot flags requested debugger");
1665 #endif
1666
1667 identify_cpu(); /* Final stage of CPU initialization */
1668 initializecpu(); /* Initialize CPU registers */
1669 initializecpucache();
1670
1671 /* make an initial tss so cpu can get interrupt stack on syscall! */
1672 common_tss[0].tss_rsp0 = thread0.td_kstack + \
1673 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb);
1674 /* Ensure the stack is aligned to 16 bytes */
1675 common_tss[0].tss_rsp0 &= ~0xFul;
1676 PCPU_SET(rsp0, common_tss[0].tss_rsp0);
1677
1678 /* doublefault stack space, runs on ist1 */
1679 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)];
1680
1681 /*
1682 * NMI stack, runs on ist2. The pcpu pointer is stored just
1683 * above the start of the ist2 stack.
1684 */
1685 np = ((struct nmi_pcpu *) &nmi0_stack[sizeof(nmi0_stack)]) - 1;
1686 np->np_pcpu = (register_t) pc;
1687 common_tss[0].tss_ist2 = (long) np;
1688
1689 /* Set the IO permission bitmap (empty due to tss seg limit) */
1690 common_tss[0].tss_iobase = sizeof(struct amd64tss) +
1691 IOPAGES * PAGE_SIZE;
1692
1693 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1694 ltr(gsel_tss);
1695
1696 /* Set up the fast syscall stuff */
1697 msr = rdmsr(MSR_EFER) | EFER_SCE;
1698 wrmsr(MSR_EFER, msr);
1699 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
1700 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
1701 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
1702 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
1703 wrmsr(MSR_STAR, msr);
1704 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
1705
1706 getmemsize(kmdp, physfree);
1707 init_param2(physmem);
1708
1709 /* now running on new page tables, configured,and u/iom is accessible */
1710
1711 msgbufinit(msgbufp, MSGBUF_SIZE);
1712 fpuinit();
1713
1714 /* transfer to user mode */
1715
1716 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
1717 _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
1718 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL);
1719 _ufssel = GSEL(GUFS32_SEL, SEL_UPL);
1720 _ugssel = GSEL(GUGS32_SEL, SEL_UPL);
1721
1722 load_ds(_udatasel);
1723 load_es(_udatasel);
1724 load_fs(_ufssel);
1725
1726 /* setup proc 0's pcb */
1727 thread0.td_pcb->pcb_flags = 0;
1728 thread0.td_pcb->pcb_cr3 = KPML4phys;
1729 thread0.td_frame = &proc0_tf;
1730
1731 env = getenv("kernelname");
1732 if (env != NULL)
1733 strlcpy(kernelname, env, sizeof(kernelname));
1734
1735 #ifdef XENHVM
1736 if (inw(0x10) == 0x49d2) {
1737 if (bootverbose)
1738 printf("Xen detected: disabling emulated block and network devices\n");
1739 outw(0x10, 3);
1740 }
1741 #endif
1742
1743 if (cpu_probe_amdc1e())
1744 cpu_idle_fn = cpu_idle_amdc1e;
1745
1746 /* Location of kernel stack for locore */
1747 return ((u_int64_t)thread0.td_pcb);
1748 }
1749
1750 void
1751 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
1752 {
1753
1754 pcpu->pc_acpi_id = 0xffffffff;
1755 }
1756
1757 void
1758 spinlock_enter(void)
1759 {
1760 struct thread *td;
1761
1762 td = curthread;
1763 if (td->td_md.md_spinlock_count == 0)
1764 td->td_md.md_saved_flags = intr_disable();
1765 td->td_md.md_spinlock_count++;
1766 critical_enter();
1767 }
1768
1769 void
1770 spinlock_exit(void)
1771 {
1772 struct thread *td;
1773
1774 td = curthread;
1775 critical_exit();
1776 td->td_md.md_spinlock_count--;
1777 if (td->td_md.md_spinlock_count == 0)
1778 intr_restore(td->td_md.md_saved_flags);
1779 }
1780
1781 /*
1782 * Construct a PCB from a trapframe. This is called from kdb_trap() where
1783 * we want to start a backtrace from the function that caused us to enter
1784 * the debugger. We have the context in the trapframe, but base the trace
1785 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
1786 * enough for a backtrace.
1787 */
1788 void
1789 makectx(struct trapframe *tf, struct pcb *pcb)
1790 {
1791
1792 pcb->pcb_r12 = tf->tf_r12;
1793 pcb->pcb_r13 = tf->tf_r13;
1794 pcb->pcb_r14 = tf->tf_r14;
1795 pcb->pcb_r15 = tf->tf_r15;
1796 pcb->pcb_rbp = tf->tf_rbp;
1797 pcb->pcb_rbx = tf->tf_rbx;
1798 pcb->pcb_rip = tf->tf_rip;
1799 pcb->pcb_rsp = (ISPL(tf->tf_cs)) ? tf->tf_rsp : (long)(tf + 1) - 8;
1800 }
1801
1802 int
1803 ptrace_set_pc(struct thread *td, unsigned long addr)
1804 {
1805 td->td_frame->tf_rip = addr;
1806 return (0);
1807 }
1808
1809 int
1810 ptrace_single_step(struct thread *td)
1811 {
1812 td->td_frame->tf_rflags |= PSL_T;
1813 return (0);
1814 }
1815
1816 int
1817 ptrace_clear_single_step(struct thread *td)
1818 {
1819 td->td_frame->tf_rflags &= ~PSL_T;
1820 return (0);
1821 }
1822
1823 int
1824 fill_regs(struct thread *td, struct reg *regs)
1825 {
1826 struct trapframe *tp;
1827
1828 tp = td->td_frame;
1829 regs->r_r15 = tp->tf_r15;
1830 regs->r_r14 = tp->tf_r14;
1831 regs->r_r13 = tp->tf_r13;
1832 regs->r_r12 = tp->tf_r12;
1833 regs->r_r11 = tp->tf_r11;
1834 regs->r_r10 = tp->tf_r10;
1835 regs->r_r9 = tp->tf_r9;
1836 regs->r_r8 = tp->tf_r8;
1837 regs->r_rdi = tp->tf_rdi;
1838 regs->r_rsi = tp->tf_rsi;
1839 regs->r_rbp = tp->tf_rbp;
1840 regs->r_rbx = tp->tf_rbx;
1841 regs->r_rdx = tp->tf_rdx;
1842 regs->r_rcx = tp->tf_rcx;
1843 regs->r_rax = tp->tf_rax;
1844 regs->r_rip = tp->tf_rip;
1845 regs->r_cs = tp->tf_cs;
1846 regs->r_rflags = tp->tf_rflags;
1847 regs->r_rsp = tp->tf_rsp;
1848 regs->r_ss = tp->tf_ss;
1849 if (tp->tf_flags & TF_HASSEGS) {
1850 regs->r_ds = tp->tf_ds;
1851 regs->r_es = tp->tf_es;
1852 regs->r_fs = tp->tf_fs;
1853 regs->r_gs = tp->tf_gs;
1854 } else {
1855 regs->r_ds = 0;
1856 regs->r_es = 0;
1857 regs->r_fs = 0;
1858 regs->r_gs = 0;
1859 }
1860 return (0);
1861 }
1862
1863 int
1864 set_regs(struct thread *td, struct reg *regs)
1865 {
1866 struct trapframe *tp;
1867 register_t rflags;
1868
1869 tp = td->td_frame;
1870 rflags = regs->r_rflags & 0xffffffff;
1871 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
1872 return (EINVAL);
1873 tp->tf_r15 = regs->r_r15;
1874 tp->tf_r14 = regs->r_r14;
1875 tp->tf_r13 = regs->r_r13;
1876 tp->tf_r12 = regs->r_r12;
1877 tp->tf_r11 = regs->r_r11;
1878 tp->tf_r10 = regs->r_r10;
1879 tp->tf_r9 = regs->r_r9;
1880 tp->tf_r8 = regs->r_r8;
1881 tp->tf_rdi = regs->r_rdi;
1882 tp->tf_rsi = regs->r_rsi;
1883 tp->tf_rbp = regs->r_rbp;
1884 tp->tf_rbx = regs->r_rbx;
1885 tp->tf_rdx = regs->r_rdx;
1886 tp->tf_rcx = regs->r_rcx;
1887 tp->tf_rax = regs->r_rax;
1888 tp->tf_rip = regs->r_rip;
1889 tp->tf_cs = regs->r_cs;
1890 tp->tf_rflags = rflags;
1891 tp->tf_rsp = regs->r_rsp;
1892 tp->tf_ss = regs->r_ss;
1893 if (0) { /* XXXKIB */
1894 tp->tf_ds = regs->r_ds;
1895 tp->tf_es = regs->r_es;
1896 tp->tf_fs = regs->r_fs;
1897 tp->tf_gs = regs->r_gs;
1898 tp->tf_flags = TF_HASSEGS;
1899 }
1900 td->td_pcb->pcb_flags |= PCB_FULLCTX;
1901 return (0);
1902 }
1903
1904 /* XXX check all this stuff! */
1905 /* externalize from sv_xmm */
1906 static void
1907 fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs)
1908 {
1909 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1910 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1911 int i;
1912
1913 /* pcb -> fpregs */
1914 bzero(fpregs, sizeof(*fpregs));
1915
1916 /* FPU control/status */
1917 penv_fpreg->en_cw = penv_xmm->en_cw;
1918 penv_fpreg->en_sw = penv_xmm->en_sw;
1919 penv_fpreg->en_tw = penv_xmm->en_tw;
1920 penv_fpreg->en_opcode = penv_xmm->en_opcode;
1921 penv_fpreg->en_rip = penv_xmm->en_rip;
1922 penv_fpreg->en_rdp = penv_xmm->en_rdp;
1923 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr;
1924 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask;
1925
1926 /* FPU registers */
1927 for (i = 0; i < 8; ++i)
1928 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10);
1929
1930 /* SSE registers */
1931 for (i = 0; i < 16; ++i)
1932 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16);
1933 }
1934
1935 /* internalize from fpregs into sv_xmm */
1936 static void
1937 set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm)
1938 {
1939 struct envxmm *penv_xmm = &sv_xmm->sv_env;
1940 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env;
1941 int i;
1942
1943 /* fpregs -> pcb */
1944 /* FPU control/status */
1945 penv_xmm->en_cw = penv_fpreg->en_cw;
1946 penv_xmm->en_sw = penv_fpreg->en_sw;
1947 penv_xmm->en_tw = penv_fpreg->en_tw;
1948 penv_xmm->en_opcode = penv_fpreg->en_opcode;
1949 penv_xmm->en_rip = penv_fpreg->en_rip;
1950 penv_xmm->en_rdp = penv_fpreg->en_rdp;
1951 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr;
1952 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask;
1953
1954 /* FPU registers */
1955 for (i = 0; i < 8; ++i)
1956 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10);
1957
1958 /* SSE registers */
1959 for (i = 0; i < 16; ++i)
1960 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16);
1961 }
1962
1963 /* externalize from td->pcb */
1964 int
1965 fill_fpregs(struct thread *td, struct fpreg *fpregs)
1966 {
1967
1968 fill_fpregs_xmm(&td->td_pcb->pcb_save, fpregs);
1969 return (0);
1970 }
1971
1972 /* internalize to td->pcb */
1973 int
1974 set_fpregs(struct thread *td, struct fpreg *fpregs)
1975 {
1976
1977 set_fpregs_xmm(fpregs, &td->td_pcb->pcb_save);
1978 return (0);
1979 }
1980
1981 /*
1982 * Get machine context.
1983 */
1984 int
1985 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
1986 {
1987 struct trapframe *tp;
1988
1989 tp = td->td_frame;
1990 PROC_LOCK(curthread->td_proc);
1991 mcp->mc_onstack = sigonstack(tp->tf_rsp);
1992 PROC_UNLOCK(curthread->td_proc);
1993 mcp->mc_r15 = tp->tf_r15;
1994 mcp->mc_r14 = tp->tf_r14;
1995 mcp->mc_r13 = tp->tf_r13;
1996 mcp->mc_r12 = tp->tf_r12;
1997 mcp->mc_r11 = tp->tf_r11;
1998 mcp->mc_r10 = tp->tf_r10;
1999 mcp->mc_r9 = tp->tf_r9;
2000 mcp->mc_r8 = tp->tf_r8;
2001 mcp->mc_rdi = tp->tf_rdi;
2002 mcp->mc_rsi = tp->tf_rsi;
2003 mcp->mc_rbp = tp->tf_rbp;
2004 mcp->mc_rbx = tp->tf_rbx;
2005 mcp->mc_rcx = tp->tf_rcx;
2006 mcp->mc_rflags = tp->tf_rflags;
2007 if (flags & GET_MC_CLEAR_RET) {
2008 mcp->mc_rax = 0;
2009 mcp->mc_rdx = 0;
2010 mcp->mc_rflags &= ~PSL_C;
2011 } else {
2012 mcp->mc_rax = tp->tf_rax;
2013 mcp->mc_rdx = tp->tf_rdx;
2014 }
2015 mcp->mc_rip = tp->tf_rip;
2016 mcp->mc_cs = tp->tf_cs;
2017 mcp->mc_rsp = tp->tf_rsp;
2018 mcp->mc_ss = tp->tf_ss;
2019 mcp->mc_ds = tp->tf_ds;
2020 mcp->mc_es = tp->tf_es;
2021 mcp->mc_fs = tp->tf_fs;
2022 mcp->mc_gs = tp->tf_gs;
2023 mcp->mc_flags = tp->tf_flags;
2024 mcp->mc_len = sizeof(*mcp);
2025 get_fpcontext(td, mcp);
2026 mcp->mc_fsbase = td->td_pcb->pcb_fsbase;
2027 mcp->mc_gsbase = td->td_pcb->pcb_gsbase;
2028 return (0);
2029 }
2030
2031 /*
2032 * Set machine context.
2033 *
2034 * However, we don't set any but the user modifiable flags, and we won't
2035 * touch the cs selector.
2036 */
2037 int
2038 set_mcontext(struct thread *td, const mcontext_t *mcp)
2039 {
2040 struct trapframe *tp;
2041 long rflags;
2042 int ret;
2043
2044 tp = td->td_frame;
2045 if (mcp->mc_len != sizeof(*mcp) ||
2046 (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
2047 return (EINVAL);
2048 rflags = (mcp->mc_rflags & PSL_USERCHANGE) |
2049 (tp->tf_rflags & ~PSL_USERCHANGE);
2050 ret = set_fpcontext(td, mcp);
2051 if (ret != 0)
2052 return (ret);
2053 tp->tf_r15 = mcp->mc_r15;
2054 tp->tf_r14 = mcp->mc_r14;
2055 tp->tf_r13 = mcp->mc_r13;
2056 tp->tf_r12 = mcp->mc_r12;
2057 tp->tf_r11 = mcp->mc_r11;
2058 tp->tf_r10 = mcp->mc_r10;
2059 tp->tf_r9 = mcp->mc_r9;
2060 tp->tf_r8 = mcp->mc_r8;
2061 tp->tf_rdi = mcp->mc_rdi;
2062 tp->tf_rsi = mcp->mc_rsi;
2063 tp->tf_rbp = mcp->mc_rbp;
2064 tp->tf_rbx = mcp->mc_rbx;
2065 tp->tf_rdx = mcp->mc_rdx;
2066 tp->tf_rcx = mcp->mc_rcx;
2067 tp->tf_rax = mcp->mc_rax;
2068 tp->tf_rip = mcp->mc_rip;
2069 tp->tf_rflags = rflags;
2070 tp->tf_rsp = mcp->mc_rsp;
2071 tp->tf_ss = mcp->mc_ss;
2072 tp->tf_flags = mcp->mc_flags;
2073 if (tp->tf_flags & TF_HASSEGS) {
2074 tp->tf_ds = mcp->mc_ds;
2075 tp->tf_es = mcp->mc_es;
2076 tp->tf_fs = mcp->mc_fs;
2077 tp->tf_gs = mcp->mc_gs;
2078 }
2079 if (mcp->mc_flags & _MC_HASBASES) {
2080 td->td_pcb->pcb_fsbase = mcp->mc_fsbase;
2081 td->td_pcb->pcb_gsbase = mcp->mc_gsbase;
2082 }
2083 td->td_pcb->pcb_flags |= PCB_FULLCTX;
2084 td->td_pcb->pcb_full_iret = 1;
2085 return (0);
2086 }
2087
2088 static void
2089 get_fpcontext(struct thread *td, mcontext_t *mcp)
2090 {
2091
2092 mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate);
2093 mcp->mc_fpformat = fpuformat();
2094 }
2095
2096 static int
2097 set_fpcontext(struct thread *td, const mcontext_t *mcp)
2098 {
2099 struct savefpu *fpstate;
2100
2101 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
2102 return (0);
2103 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
2104 return (EINVAL);
2105 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
2106 /* We don't care what state is left in the FPU or PCB. */
2107 fpstate_drop(td);
2108 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
2109 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
2110 /*
2111 * XXX we violate the dubious requirement that fpusetregs()
2112 * be called with interrupts disabled.
2113 * XXX obsolete on trap-16 systems?
2114 */
2115 fpstate = (struct savefpu *)&mcp->mc_fpstate;
2116 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
2117 fpusetregs(td, fpstate);
2118 } else
2119 return (EINVAL);
2120 return (0);
2121 }
2122
2123 void
2124 fpstate_drop(struct thread *td)
2125 {
2126 register_t s;
2127
2128 s = intr_disable();
2129 if (PCPU_GET(fpcurthread) == td)
2130 fpudrop();
2131 /*
2132 * XXX force a full drop of the fpu. The above only drops it if we
2133 * owned it.
2134 *
2135 * XXX I don't much like fpugetregs()'s semantics of doing a full
2136 * drop. Dropping only to the pcb matches fnsave's behaviour.
2137 * We only need to drop to !PCB_INITDONE in sendsig(). But
2138 * sendsig() is the only caller of fpugetregs()... perhaps we just
2139 * have too many layers.
2140 */
2141 curthread->td_pcb->pcb_flags &= ~PCB_FPUINITDONE;
2142 intr_restore(s);
2143 }
2144
2145 int
2146 fill_dbregs(struct thread *td, struct dbreg *dbregs)
2147 {
2148 struct pcb *pcb;
2149
2150 if (td == NULL) {
2151 dbregs->dr[0] = rdr0();
2152 dbregs->dr[1] = rdr1();
2153 dbregs->dr[2] = rdr2();
2154 dbregs->dr[3] = rdr3();
2155 dbregs->dr[6] = rdr6();
2156 dbregs->dr[7] = rdr7();
2157 } else {
2158 pcb = td->td_pcb;
2159 dbregs->dr[0] = pcb->pcb_dr0;
2160 dbregs->dr[1] = pcb->pcb_dr1;
2161 dbregs->dr[2] = pcb->pcb_dr2;
2162 dbregs->dr[3] = pcb->pcb_dr3;
2163 dbregs->dr[6] = pcb->pcb_dr6;
2164 dbregs->dr[7] = pcb->pcb_dr7;
2165 }
2166 dbregs->dr[4] = 0;
2167 dbregs->dr[5] = 0;
2168 dbregs->dr[8] = 0;
2169 dbregs->dr[9] = 0;
2170 dbregs->dr[10] = 0;
2171 dbregs->dr[11] = 0;
2172 dbregs->dr[12] = 0;
2173 dbregs->dr[13] = 0;
2174 dbregs->dr[14] = 0;
2175 dbregs->dr[15] = 0;
2176 return (0);
2177 }
2178
2179 int
2180 set_dbregs(struct thread *td, struct dbreg *dbregs)
2181 {
2182 struct pcb *pcb;
2183 int i;
2184
2185 if (td == NULL) {
2186 load_dr0(dbregs->dr[0]);
2187 load_dr1(dbregs->dr[1]);
2188 load_dr2(dbregs->dr[2]);
2189 load_dr3(dbregs->dr[3]);
2190 load_dr6(dbregs->dr[6]);
2191 load_dr7(dbregs->dr[7]);
2192 } else {
2193 /*
2194 * Don't let an illegal value for dr7 get set. Specifically,
2195 * check for undefined settings. Setting these bit patterns
2196 * result in undefined behaviour and can lead to an unexpected
2197 * TRCTRAP or a general protection fault right here.
2198 * Upper bits of dr6 and dr7 must not be set
2199 */
2200 for (i = 0; i < 4; i++) {
2201 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
2202 return (EINVAL);
2203 if (td->td_frame->tf_cs == _ucode32sel &&
2204 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8)
2205 return (EINVAL);
2206 }
2207 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 ||
2208 (dbregs->dr[7] & 0xffffffff00000000ul) != 0)
2209 return (EINVAL);
2210
2211 pcb = td->td_pcb;
2212
2213 /*
2214 * Don't let a process set a breakpoint that is not within the
2215 * process's address space. If a process could do this, it
2216 * could halt the system by setting a breakpoint in the kernel
2217 * (if ddb was enabled). Thus, we need to check to make sure
2218 * that no breakpoints are being enabled for addresses outside
2219 * process's address space.
2220 *
2221 * XXX - what about when the watched area of the user's
2222 * address space is written into from within the kernel
2223 * ... wouldn't that still cause a breakpoint to be generated
2224 * from within kernel mode?
2225 */
2226
2227 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
2228 /* dr0 is enabled */
2229 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
2230 return (EINVAL);
2231 }
2232 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
2233 /* dr1 is enabled */
2234 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
2235 return (EINVAL);
2236 }
2237 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
2238 /* dr2 is enabled */
2239 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
2240 return (EINVAL);
2241 }
2242 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
2243 /* dr3 is enabled */
2244 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
2245 return (EINVAL);
2246 }
2247
2248 pcb->pcb_dr0 = dbregs->dr[0];
2249 pcb->pcb_dr1 = dbregs->dr[1];
2250 pcb->pcb_dr2 = dbregs->dr[2];
2251 pcb->pcb_dr3 = dbregs->dr[3];
2252 pcb->pcb_dr6 = dbregs->dr[6];
2253 pcb->pcb_dr7 = dbregs->dr[7];
2254
2255 pcb->pcb_flags |= PCB_DBREGS;
2256 }
2257
2258 return (0);
2259 }
2260
2261 void
2262 reset_dbregs(void)
2263 {
2264
2265 load_dr7(0); /* Turn off the control bits first */
2266 load_dr0(0);
2267 load_dr1(0);
2268 load_dr2(0);
2269 load_dr3(0);
2270 load_dr6(0);
2271 }
2272
2273 /*
2274 * Return > 0 if a hardware breakpoint has been hit, and the
2275 * breakpoint was in user space. Return 0, otherwise.
2276 */
2277 int
2278 user_dbreg_trap(void)
2279 {
2280 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */
2281 u_int64_t bp; /* breakpoint bits extracted from dr6 */
2282 int nbp; /* number of breakpoints that triggered */
2283 caddr_t addr[4]; /* breakpoint addresses */
2284 int i;
2285
2286 dr7 = rdr7();
2287 if ((dr7 & 0x000000ff) == 0) {
2288 /*
2289 * all GE and LE bits in the dr7 register are zero,
2290 * thus the trap couldn't have been caused by the
2291 * hardware debug registers
2292 */
2293 return 0;
2294 }
2295
2296 nbp = 0;
2297 dr6 = rdr6();
2298 bp = dr6 & 0x0000000f;
2299
2300 if (!bp) {
2301 /*
2302 * None of the breakpoint bits are set meaning this
2303 * trap was not caused by any of the debug registers
2304 */
2305 return 0;
2306 }
2307
2308 /*
2309 * at least one of the breakpoints were hit, check to see
2310 * which ones and if any of them are user space addresses
2311 */
2312
2313 if (bp & 0x01) {
2314 addr[nbp++] = (caddr_t)rdr0();
2315 }
2316 if (bp & 0x02) {
2317 addr[nbp++] = (caddr_t)rdr1();
2318 }
2319 if (bp & 0x04) {
2320 addr[nbp++] = (caddr_t)rdr2();
2321 }
2322 if (bp & 0x08) {
2323 addr[nbp++] = (caddr_t)rdr3();
2324 }
2325
2326 for (i = 0; i < nbp; i++) {
2327 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
2328 /*
2329 * addr[i] is in user space
2330 */
2331 return nbp;
2332 }
2333 }
2334
2335 /*
2336 * None of the breakpoints are in user space.
2337 */
2338 return 0;
2339 }
2340
2341 #ifdef KDB
2342
2343 /*
2344 * Provide inb() and outb() as functions. They are normally only available as
2345 * inline functions, thus cannot be called from the debugger.
2346 */
2347
2348 /* silence compiler warnings */
2349 u_char inb_(u_short);
2350 void outb_(u_short, u_char);
2351
2352 u_char
2353 inb_(u_short port)
2354 {
2355 return inb(port);
2356 }
2357
2358 void
2359 outb_(u_short port, u_char data)
2360 {
2361 outb(port, data);
2362 }
2363
2364 #endif /* KDB */
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