Retarget makesyscalls.sh from FreeBSD to TurtleBSD
[dragonfly.git] / sys / platform / pc32 / i386 / machdep.c
CommitLineData
984263bc
MD
1/*-
2 * Copyright (c) 1992 Terrence R. Lambert.
3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * William Jolitz.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
38 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $
1de703da 39 * $DragonFly: src/sys/platform/pc32/i386/machdep.c,v 1.2 2003/06/17 04:28:35 dillon Exp $
984263bc
MD
40 */
41
42#include "apm.h"
43#include "ether.h"
44#include "npx.h"
45#include "opt_atalk.h"
46#include "opt_compat.h"
47#include "opt_cpu.h"
48#include "opt_ddb.h"
49#include "opt_directio.h"
50#include "opt_inet.h"
51#include "opt_ipx.h"
52#include "opt_maxmem.h"
53#include "opt_msgbuf.h"
54#include "opt_perfmon.h"
55#include "opt_swap.h"
56#include "opt_user_ldt.h"
57#include "opt_userconfig.h"
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/sysproto.h>
62#include <sys/signalvar.h>
63#include <sys/kernel.h>
64#include <sys/linker.h>
65#include <sys/malloc.h>
66#include <sys/proc.h>
67#include <sys/buf.h>
68#include <sys/reboot.h>
69#include <sys/callout.h>
70#include <sys/mbuf.h>
71#include <sys/msgbuf.h>
72#include <sys/sysent.h>
73#include <sys/sysctl.h>
74#include <sys/vmmeter.h>
75#include <sys/bus.h>
76
77#include <vm/vm.h>
78#include <vm/vm_param.h>
79#include <sys/lock.h>
80#include <vm/vm_kern.h>
81#include <vm/vm_object.h>
82#include <vm/vm_page.h>
83#include <vm/vm_map.h>
84#include <vm/vm_pager.h>
85#include <vm/vm_extern.h>
86
87#include <sys/user.h>
88#include <sys/exec.h>
89#include <sys/cons.h>
90
91#include <ddb/ddb.h>
92
93#include <net/netisr.h>
94
95#include <machine/cpu.h>
96#include <machine/reg.h>
97#include <machine/clock.h>
98#include <machine/specialreg.h>
99#include <machine/bootinfo.h>
100#include <machine/ipl.h>
101#include <machine/md_var.h>
102#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
103#ifdef SMP
104#include <machine/smp.h>
105#include <machine/globaldata.h>
106#endif
107#ifdef PERFMON
108#include <machine/perfmon.h>
109#endif
110#include <machine/cputypes.h>
111
112#ifdef OLD_BUS_ARCH
113#include <i386/isa/isa_device.h>
114#endif
115#include <i386/isa/intr_machdep.h>
116#include <isa/rtc.h>
117#include <machine/vm86.h>
118#include <sys/random.h>
119#include <sys/ptrace.h>
120#include <machine/sigframe.h>
121
122extern void init386 __P((int first));
123extern void dblfault_handler __P((void));
124
125extern void printcpuinfo(void); /* XXX header file */
126extern void finishidentcpu(void);
127extern void panicifcpuunsupported(void);
128extern void initializecpu(void);
129
130static void cpu_startup __P((void *));
131#ifdef CPU_ENABLE_SSE
132static void set_fpregs_xmm __P((struct save87 *, struct savexmm *));
133static void fill_fpregs_xmm __P((struct savexmm *, struct save87 *));
134#endif /* CPU_ENABLE_SSE */
135#ifdef DIRECTIO
136extern void ffs_rawread_setup(void);
137#endif /* DIRECTIO */
138
139SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL)
140
141static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf");
142
143int _udatasel, _ucodesel;
144u_int atdevbase;
145
146#if defined(SWTCH_OPTIM_STATS)
147extern int swtch_optim_stats;
148SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
149 CTLFLAG_RD, &swtch_optim_stats, 0, "");
150SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
151 CTLFLAG_RD, &tlb_flush_count, 0, "");
152#endif
153
154#ifdef PC98
155static int ispc98 = 1;
156#else
157static int ispc98 = 0;
158#endif
159SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, "");
160
161int physmem = 0;
162int cold = 1;
163
164static int
165sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
166{
167 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
168 return (error);
169}
170
171SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD,
172 0, 0, sysctl_hw_physmem, "IU", "");
173
174static int
175sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
176{
177 int error = sysctl_handle_int(oidp, 0,
178 ctob(physmem - cnt.v_wire_count), req);
179 return (error);
180}
181
182SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
183 0, 0, sysctl_hw_usermem, "IU", "");
184
185static int
186sysctl_hw_availpages(SYSCTL_HANDLER_ARGS)
187{
188 int error = sysctl_handle_int(oidp, 0,
189 i386_btop(avail_end - avail_start), req);
190 return (error);
191}
192
193SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD,
194 0, 0, sysctl_hw_availpages, "I", "");
195
196static int
197sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
198{
199 int error;
200
201 /* Unwind the buffer, so that it's linear (possibly starting with
202 * some initial nulls).
203 */
204 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
205 msgbufp->msg_size-msgbufp->msg_bufr,req);
206 if(error) return(error);
207 if(msgbufp->msg_bufr>0) {
208 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
209 msgbufp->msg_bufr,req);
210 }
211 return(error);
212}
213
214SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
215 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
216
217static int msgbuf_clear;
218
219static int
220sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
221{
222 int error;
223 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
224 req);
225 if (!error && req->newptr) {
226 /* Clear the buffer and reset write pointer */
227 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
228 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
229 msgbuf_clear=0;
230 }
231 return (error);
232}
233
234SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
235 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
236 "Clear kernel message buffer");
237
238int bootverbose = 0, Maxmem = 0;
239long dumplo;
240
241vm_offset_t phys_avail[10];
242
243/* must be 2 less so 0 0 can signal end of chunks */
244#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2)
245
246static vm_offset_t buffer_sva, buffer_eva;
247vm_offset_t clean_sva, clean_eva;
248static vm_offset_t pager_sva, pager_eva;
249static struct trapframe proc0_tf;
250
251static void
252cpu_startup(dummy)
253 void *dummy;
254{
255 register unsigned i;
256 register caddr_t v;
257 vm_offset_t maxaddr;
258 vm_size_t size = 0;
259 int firstaddr;
260 vm_offset_t minaddr;
261
262 if (boothowto & RB_VERBOSE)
263 bootverbose++;
264
265 /*
266 * Good {morning,afternoon,evening,night}.
267 */
268 printf("%s", version);
269 startrtclock();
270 printcpuinfo();
271 panicifcpuunsupported();
272#ifdef PERFMON
273 perfmon_init();
274#endif
275 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024);
276 /*
277 * Display any holes after the first chunk of extended memory.
278 */
279 if (bootverbose) {
280 int indx;
281
282 printf("Physical memory chunk(s):\n");
283 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
284 unsigned int size1 = phys_avail[indx + 1] - phys_avail[indx];
285
286 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n",
287 phys_avail[indx], phys_avail[indx + 1] - 1, size1,
288 size1 / PAGE_SIZE);
289 }
290 }
291
292 /*
293 * Calculate callout wheel size
294 */
295 for (callwheelsize = 1, callwheelbits = 0;
296 callwheelsize < ncallout;
297 callwheelsize <<= 1, ++callwheelbits)
298 ;
299 callwheelmask = callwheelsize - 1;
300
301 /*
302 * Allocate space for system data structures.
303 * The first available kernel virtual address is in "v".
304 * As pages of kernel virtual memory are allocated, "v" is incremented.
305 * As pages of memory are allocated and cleared,
306 * "firstaddr" is incremented.
307 * An index into the kernel page table corresponding to the
308 * virtual memory address maintained in "v" is kept in "mapaddr".
309 */
310
311 /*
312 * Make two passes. The first pass calculates how much memory is
313 * needed and allocates it. The second pass assigns virtual
314 * addresses to the various data structures.
315 */
316 firstaddr = 0;
317again:
318 v = (caddr_t)firstaddr;
319
320#define valloc(name, type, num) \
321 (name) = (type *)v; v = (caddr_t)((name)+(num))
322#define valloclim(name, type, num, lim) \
323 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
324
325 valloc(callout, struct callout, ncallout);
326 valloc(callwheel, struct callout_tailq, callwheelsize);
327
328 /*
329 * The nominal buffer size (and minimum KVA allocation) is BKVASIZE.
330 * For the first 64MB of ram nominally allocate sufficient buffers to
331 * cover 1/4 of our ram. Beyond the first 64MB allocate additional
332 * buffers to cover 1/20 of our ram over 64MB. When auto-sizing
333 * the buffer cache we limit the eventual kva reservation to
334 * maxbcache bytes.
335 *
336 * factor represents the 1/4 x ram conversion.
337 */
338 if (nbuf == 0) {
339 int factor = 4 * BKVASIZE / 1024;
340 int kbytes = physmem * (PAGE_SIZE / 1024);
341
342 nbuf = 50;
343 if (kbytes > 4096)
344 nbuf += min((kbytes - 4096) / factor, 65536 / factor);
345 if (kbytes > 65536)
346 nbuf += (kbytes - 65536) * 2 / (factor * 5);
347 if (maxbcache && nbuf > maxbcache / BKVASIZE)
348 nbuf = maxbcache / BKVASIZE;
349 }
350
351 /*
352 * Do not allow the buffer_map to be more then 1/2 the size of the
353 * kernel_map.
354 */
355 if (nbuf > (kernel_map->max_offset - kernel_map->min_offset) /
356 (BKVASIZE * 2)) {
357 nbuf = (kernel_map->max_offset - kernel_map->min_offset) /
358 (BKVASIZE * 2);
359 printf("Warning: nbufs capped at %d\n", nbuf);
360 }
361
362 nswbuf = max(min(nbuf/4, 256), 16);
363#ifdef NSWBUF_MIN
364 if (nswbuf < NSWBUF_MIN)
365 nswbuf = NSWBUF_MIN;
366#endif
367#ifdef DIRECTIO
368 ffs_rawread_setup();
369#endif
370
371 valloc(swbuf, struct buf, nswbuf);
372 valloc(buf, struct buf, nbuf);
373 v = bufhashinit(v);
374
375 /*
376 * End of first pass, size has been calculated so allocate memory
377 */
378 if (firstaddr == 0) {
379 size = (vm_size_t)(v - firstaddr);
380 firstaddr = (int)kmem_alloc(kernel_map, round_page(size));
381 if (firstaddr == 0)
382 panic("startup: no room for tables");
383 goto again;
384 }
385
386 /*
387 * End of second pass, addresses have been assigned
388 */
389 if ((vm_size_t)(v - firstaddr) != size)
390 panic("startup: table size inconsistency");
391
392 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva,
393 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size);
394 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva,
395 (nbuf*BKVASIZE));
396 buffer_map->system_map = 1;
397 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva,
398 (nswbuf*MAXPHYS) + pager_map_size);
399 pager_map->system_map = 1;
400 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
401 (16*(ARG_MAX+(PAGE_SIZE*3))));
402
403 /*
404 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size
405 * we use the more space efficient malloc in place of kmem_alloc.
406 */
407 {
408 vm_offset_t mb_map_size;
409
410 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES;
411 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE));
412 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT);
413 bzero(mclrefcnt, mb_map_size / MCLBYTES);
414 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr,
415 mb_map_size);
416 mb_map->system_map = 1;
417 }
418
419 /*
420 * Initialize callouts
421 */
422 SLIST_INIT(&callfree);
423 for (i = 0; i < ncallout; i++) {
424 callout_init(&callout[i]);
425 callout[i].c_flags = CALLOUT_LOCAL_ALLOC;
426 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle);
427 }
428
429 for (i = 0; i < callwheelsize; i++) {
430 TAILQ_INIT(&callwheel[i]);
431 }
432
433#if defined(USERCONFIG)
434 userconfig();
435 cninit(); /* the preferred console may have changed */
436#endif
437
438 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count),
439 ptoa(cnt.v_free_count) / 1024);
440
441 /*
442 * Set up buffers, so they can be used to read disk labels.
443 */
444 bufinit();
445 vm_pager_bufferinit();
446
447#ifdef SMP
448 /*
449 * OK, enough kmem_alloc/malloc state should be up, lets get on with it!
450 */
451 mp_start(); /* fire up the APs and APICs */
452 mp_announce();
453#endif /* SMP */
454 cpu_setregs();
455}
456
457int
458register_netisr(num, handler)
459 int num;
460 netisr_t *handler;
461{
462
463 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
464 printf("register_netisr: bad isr number: %d\n", num);
465 return (EINVAL);
466 }
467 netisrs[num] = handler;
468 return (0);
469}
470
471int
472unregister_netisr(num)
473 int num;
474{
475
476 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
477 printf("unregister_netisr: bad isr number: %d\n", num);
478 return (EINVAL);
479 }
480 netisrs[num] = NULL;
481 return (0);
482}
483
484/*
485 * Send an interrupt to process.
486 *
487 * Stack is set up to allow sigcode stored
488 * at top to call routine, followed by kcall
489 * to sigreturn routine below. After sigreturn
490 * resets the signal mask, the stack, and the
491 * frame pointer, it returns to the user
492 * specified pc, psl.
493 */
494static void
495osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
496{
497 register struct proc *p = curproc;
498 register struct trapframe *regs;
499 register struct osigframe *fp;
500 struct osigframe sf;
501 struct sigacts *psp = p->p_sigacts;
502 int oonstack;
503
504 regs = p->p_md.md_regs;
505 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
506
507 /* Allocate and validate space for the signal handler context. */
508 if ((p->p_flag & P_ALTSTACK) && !oonstack &&
509 SIGISMEMBER(psp->ps_sigonstack, sig)) {
510 fp = (struct osigframe *)(p->p_sigstk.ss_sp +
511 p->p_sigstk.ss_size - sizeof(struct osigframe));
512 p->p_sigstk.ss_flags |= SS_ONSTACK;
513 }
514 else
515 fp = (struct osigframe *)regs->tf_esp - 1;
516
517 /* Translate the signal if appropriate */
518 if (p->p_sysent->sv_sigtbl) {
519 if (sig <= p->p_sysent->sv_sigsize)
520 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
521 }
522
523 /* Build the argument list for the signal handler. */
524 sf.sf_signum = sig;
525 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
526 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
527 /* Signal handler installed with SA_SIGINFO. */
528 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
529 sf.sf_siginfo.si_signo = sig;
530 sf.sf_siginfo.si_code = code;
531 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
532 }
533 else {
534 /* Old FreeBSD-style arguments. */
535 sf.sf_arg2 = code;
536 sf.sf_addr = regs->tf_err;
537 sf.sf_ahu.sf_handler = catcher;
538 }
539
540 /* save scratch registers */
541 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
542 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
543 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
544 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
545 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
546 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
547 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
548 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
549 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
550 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
551 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
552 sf.sf_siginfo.si_sc.sc_gs = rgs();
553 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
554
555 /* Build the signal context to be used by sigreturn. */
556 sf.sf_siginfo.si_sc.sc_onstack = oonstack;
557 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
558 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
559 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
560 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
561 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
562 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
563 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
564
565 /*
566 * If we're a vm86 process, we want to save the segment registers.
567 * We also change eflags to be our emulated eflags, not the actual
568 * eflags.
569 */
570 if (regs->tf_eflags & PSL_VM) {
571 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
572 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
573
574 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
575 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
576 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
577 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
578
579 if (vm86->vm86_has_vme == 0)
580 sf.sf_siginfo.si_sc.sc_ps =
581 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP))
582 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
583 /* see sendsig for comment */
584 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
585 }
586
587 /* Copy the sigframe out to the user's stack. */
588 if (copyout(&sf, fp, sizeof(struct osigframe)) != 0) {
589 /*
590 * Something is wrong with the stack pointer.
591 * ...Kill the process.
592 */
593 sigexit(p, SIGILL);
594 }
595
596 regs->tf_esp = (int)fp;
597 regs->tf_eip = PS_STRINGS - szosigcode;
598 regs->tf_eflags &= ~PSL_T;
599 regs->tf_cs = _ucodesel;
600 regs->tf_ds = _udatasel;
601 regs->tf_es = _udatasel;
602 regs->tf_fs = _udatasel;
603 load_gs(_udatasel);
604 regs->tf_ss = _udatasel;
605}
606
607void
608sendsig(catcher, sig, mask, code)
609 sig_t catcher;
610 int sig;
611 sigset_t *mask;
612 u_long code;
613{
614 struct proc *p = curproc;
615 struct trapframe *regs;
616 struct sigacts *psp = p->p_sigacts;
617 struct sigframe sf, *sfp;
618 int oonstack;
619
620 if (SIGISMEMBER(psp->ps_osigset, sig)) {
621 osendsig(catcher, sig, mask, code);
622 return;
623 }
624
625 regs = p->p_md.md_regs;
626 oonstack = (p->p_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
627
628 /* save user context */
629 bzero(&sf, sizeof(struct sigframe));
630 sf.sf_uc.uc_sigmask = *mask;
631 sf.sf_uc.uc_stack = p->p_sigstk;
632 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
633 sf.sf_uc.uc_mcontext.mc_gs = rgs();
634 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
635
636 /* Allocate and validate space for the signal handler context. */
637 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
638 SIGISMEMBER(psp->ps_sigonstack, sig)) {
639 sfp = (struct sigframe *)(p->p_sigstk.ss_sp +
640 p->p_sigstk.ss_size - sizeof(struct sigframe));
641 p->p_sigstk.ss_flags |= SS_ONSTACK;
642 }
643 else
644 sfp = (struct sigframe *)regs->tf_esp - 1;
645
646 /* Translate the signal is appropriate */
647 if (p->p_sysent->sv_sigtbl) {
648 if (sig <= p->p_sysent->sv_sigsize)
649 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
650 }
651
652 /* Build the argument list for the signal handler. */
653 sf.sf_signum = sig;
654 sf.sf_ucontext = (register_t)&sfp->sf_uc;
655 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
656 /* Signal handler installed with SA_SIGINFO. */
657 sf.sf_siginfo = (register_t)&sfp->sf_si;
658 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
659
660 /* fill siginfo structure */
661 sf.sf_si.si_signo = sig;
662 sf.sf_si.si_code = code;
663 sf.sf_si.si_addr = (void*)regs->tf_err;
664 }
665 else {
666 /* Old FreeBSD-style arguments. */
667 sf.sf_siginfo = code;
668 sf.sf_addr = regs->tf_err;
669 sf.sf_ahu.sf_handler = catcher;
670 }
671
672 /*
673 * If we're a vm86 process, we want to save the segment registers.
674 * We also change eflags to be our emulated eflags, not the actual
675 * eflags.
676 */
677 if (regs->tf_eflags & PSL_VM) {
678 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
679 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
680
681 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
682 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
683 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
684 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
685
686 if (vm86->vm86_has_vme == 0)
687 sf.sf_uc.uc_mcontext.mc_eflags =
688 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
689 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
690
691 /*
692 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
693 * syscalls made by the signal handler. This just avoids
694 * wasting time for our lazy fixup of such faults. PSL_NT
695 * does nothing in vm86 mode, but vm86 programs can set it
696 * almost legitimately in probes for old cpu types.
697 */
698 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
699 }
700
701 /*
702 * Copy the sigframe out to the user's stack.
703 */
704 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
705 /*
706 * Something is wrong with the stack pointer.
707 * ...Kill the process.
708 */
709 sigexit(p, SIGILL);
710 }
711
712 regs->tf_esp = (int)sfp;
713 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
714 regs->tf_eflags &= ~PSL_T;
715 regs->tf_cs = _ucodesel;
716 regs->tf_ds = _udatasel;
717 regs->tf_es = _udatasel;
718 regs->tf_fs = _udatasel;
719 load_gs(_udatasel);
720 regs->tf_ss = _udatasel;
721}
722
723/*
724 * System call to cleanup state after a signal
725 * has been taken. Reset signal mask and
726 * stack state from context left by sendsig (above).
727 * Return to previous pc and psl as specified by
728 * context left by sendsig. Check carefully to
729 * make sure that the user has not modified the
730 * state to gain improper privileges.
731 */
732#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
733#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
734
735int
736osigreturn(p, uap)
737 struct proc *p;
738 struct osigreturn_args /* {
739 struct osigcontext *sigcntxp;
740 } */ *uap;
741{
742 register struct osigcontext *scp;
743 register struct trapframe *regs = p->p_md.md_regs;
744 int eflags;
745
746 scp = uap->sigcntxp;
747
748 if (!useracc((caddr_t)scp, sizeof (struct osigcontext), VM_PROT_READ))
749 return(EFAULT);
750
751 eflags = scp->sc_ps;
752 if (eflags & PSL_VM) {
753 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
754 struct vm86_kernel *vm86;
755
756 /*
757 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
758 * set up the vm86 area, and we can't enter vm86 mode.
759 */
760 if (p->p_addr->u_pcb.pcb_ext == 0)
761 return (EINVAL);
762 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
763 if (vm86->vm86_inited == 0)
764 return (EINVAL);
765
766 /* go back to user mode if both flags are set */
767 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
768 trapsignal(p, SIGBUS, 0);
769
770 if (vm86->vm86_has_vme) {
771 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
772 (eflags & VME_USERCHANGE) | PSL_VM;
773 } else {
774 vm86->vm86_eflags = eflags; /* save VIF, VIP */
775 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
776 }
777 tf->tf_vm86_ds = scp->sc_ds;
778 tf->tf_vm86_es = scp->sc_es;
779 tf->tf_vm86_fs = scp->sc_fs;
780 tf->tf_vm86_gs = scp->sc_gs;
781 tf->tf_ds = _udatasel;
782 tf->tf_es = _udatasel;
783 tf->tf_fs = _udatasel;
784 } else {
785 /*
786 * Don't allow users to change privileged or reserved flags.
787 */
788 /*
789 * XXX do allow users to change the privileged flag PSL_RF.
790 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
791 * should sometimes set it there too. tf_eflags is kept in
792 * the signal context during signal handling and there is no
793 * other place to remember it, so the PSL_RF bit may be
794 * corrupted by the signal handler without us knowing.
795 * Corruption of the PSL_RF bit at worst causes one more or
796 * one less debugger trap, so allowing it is fairly harmless.
797 */
798 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
799 return(EINVAL);
800 }
801
802 /*
803 * Don't allow users to load a valid privileged %cs. Let the
804 * hardware check for invalid selectors, excess privilege in
805 * other selectors, invalid %eip's and invalid %esp's.
806 */
807 if (!CS_SECURE(scp->sc_cs)) {
808 trapsignal(p, SIGBUS, T_PROTFLT);
809 return(EINVAL);
810 }
811 regs->tf_ds = scp->sc_ds;
812 regs->tf_es = scp->sc_es;
813 regs->tf_fs = scp->sc_fs;
814 }
815
816 /* restore scratch registers */
817 regs->tf_eax = scp->sc_eax;
818 regs->tf_ebx = scp->sc_ebx;
819 regs->tf_ecx = scp->sc_ecx;
820 regs->tf_edx = scp->sc_edx;
821 regs->tf_esi = scp->sc_esi;
822 regs->tf_edi = scp->sc_edi;
823 regs->tf_cs = scp->sc_cs;
824 regs->tf_ss = scp->sc_ss;
825 regs->tf_isp = scp->sc_isp;
826
827 if (scp->sc_onstack & 01)
828 p->p_sigstk.ss_flags |= SS_ONSTACK;
829 else
830 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
831
832 SIGSETOLD(p->p_sigmask, scp->sc_mask);
833 SIG_CANTMASK(p->p_sigmask);
834 regs->tf_ebp = scp->sc_fp;
835 regs->tf_esp = scp->sc_sp;
836 regs->tf_eip = scp->sc_pc;
837 regs->tf_eflags = eflags;
838 return(EJUSTRETURN);
839}
840
841int
842sigreturn(p, uap)
843 struct proc *p;
844 struct sigreturn_args /* {
845 ucontext_t *sigcntxp;
846 } */ *uap;
847{
848 struct trapframe *regs;
849 ucontext_t *ucp;
850 int cs, eflags;
851
852 ucp = uap->sigcntxp;
853
854 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ))
855 return (EFAULT);
856 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516)
857 return (osigreturn(p, (struct osigreturn_args *)uap));
858
859 /*
860 * Since ucp is not an osigcontext but a ucontext_t, we have to
861 * check again if all of it is accessible. A ucontext_t is
862 * much larger, so instead of just checking for the pointer
863 * being valid for the size of an osigcontext, now check for
864 * it being valid for a whole, new-style ucontext_t.
865 */
866 if (!useracc((caddr_t)ucp, sizeof(ucontext_t), VM_PROT_READ))
867 return (EFAULT);
868
869 regs = p->p_md.md_regs;
870 eflags = ucp->uc_mcontext.mc_eflags;
871
872 if (eflags & PSL_VM) {
873 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
874 struct vm86_kernel *vm86;
875
876 /*
877 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
878 * set up the vm86 area, and we can't enter vm86 mode.
879 */
880 if (p->p_addr->u_pcb.pcb_ext == 0)
881 return (EINVAL);
882 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
883 if (vm86->vm86_inited == 0)
884 return (EINVAL);
885
886 /* go back to user mode if both flags are set */
887 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
888 trapsignal(p, SIGBUS, 0);
889
890 if (vm86->vm86_has_vme) {
891 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
892 (eflags & VME_USERCHANGE) | PSL_VM;
893 } else {
894 vm86->vm86_eflags = eflags; /* save VIF, VIP */
895 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
896 }
897 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
898 tf->tf_eflags = eflags;
899 tf->tf_vm86_ds = tf->tf_ds;
900 tf->tf_vm86_es = tf->tf_es;
901 tf->tf_vm86_fs = tf->tf_fs;
902 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
903 tf->tf_ds = _udatasel;
904 tf->tf_es = _udatasel;
905 tf->tf_fs = _udatasel;
906 } else {
907 /*
908 * Don't allow users to change privileged or reserved flags.
909 */
910 /*
911 * XXX do allow users to change the privileged flag PSL_RF.
912 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
913 * should sometimes set it there too. tf_eflags is kept in
914 * the signal context during signal handling and there is no
915 * other place to remember it, so the PSL_RF bit may be
916 * corrupted by the signal handler without us knowing.
917 * Corruption of the PSL_RF bit at worst causes one more or
918 * one less debugger trap, so allowing it is fairly harmless.
919 */
920 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
921 printf("sigreturn: eflags = 0x%x\n", eflags);
922 return(EINVAL);
923 }
924
925 /*
926 * Don't allow users to load a valid privileged %cs. Let the
927 * hardware check for invalid selectors, excess privilege in
928 * other selectors, invalid %eip's and invalid %esp's.
929 */
930 cs = ucp->uc_mcontext.mc_cs;
931 if (!CS_SECURE(cs)) {
932 printf("sigreturn: cs = 0x%x\n", cs);
933 trapsignal(p, SIGBUS, T_PROTFLT);
934 return(EINVAL);
935 }
936 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
937 }
938
939 if (ucp->uc_mcontext.mc_onstack & 1)
940 p->p_sigstk.ss_flags |= SS_ONSTACK;
941 else
942 p->p_sigstk.ss_flags &= ~SS_ONSTACK;
943
944 p->p_sigmask = ucp->uc_sigmask;
945 SIG_CANTMASK(p->p_sigmask);
946 return(EJUSTRETURN);
947}
948
949/*
950 * Machine dependent boot() routine
951 *
952 * I haven't seen anything to put here yet
953 * Possibly some stuff might be grafted back here from boot()
954 */
955void
956cpu_boot(int howto)
957{
958}
959
960/*
961 * Shutdown the CPU as much as possible
962 */
963void
964cpu_halt(void)
965{
966 for (;;)
967 __asm__ ("hlt");
968}
969
970/*
971 * Hook to idle the CPU when possible. This is disabled by default for
972 * the SMP case as there is a small window of opportunity whereby a ready
973 * process is delayed to the next clock tick. It should be safe to enable
974 * for SMP if power is a concern.
975 *
976 * On -stable, cpu_idle() is called with interrupts disabled and must
977 * return with them enabled.
978 */
979#ifdef SMP
980static int cpu_idle_hlt = 0;
981#else
982static int cpu_idle_hlt = 1;
983#endif
984SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
985 &cpu_idle_hlt, 0, "Idle loop HLT enable");
986
987void
988cpu_idle(void)
989{
990 if (cpu_idle_hlt) {
991 /*
992 * We must guarentee that hlt is exactly the instruction
993 * following the sti.
994 */
995 __asm __volatile("sti; hlt");
996 } else {
997 __asm __volatile("sti");
998 }
999}
1000
1001/*
1002 * Clear registers on exec
1003 */
1004void
1005setregs(p, entry, stack, ps_strings)
1006 struct proc *p;
1007 u_long entry;
1008 u_long stack;
1009 u_long ps_strings;
1010{
1011 struct trapframe *regs = p->p_md.md_regs;
1012 struct pcb *pcb = &p->p_addr->u_pcb;
1013
1014 /* Reset pc->pcb_gs and %gs before possibly invalidating it. */
1015 pcb->pcb_gs = _udatasel;
1016 load_gs(_udatasel);
1017
1018#ifdef USER_LDT
1019 /* was i386_user_cleanup() in NetBSD */
1020 user_ldt_free(pcb);
1021#endif
1022
1023 bzero((char *)regs, sizeof(struct trapframe));
1024 regs->tf_eip = entry;
1025 regs->tf_esp = stack;
1026 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
1027 regs->tf_ss = _udatasel;
1028 regs->tf_ds = _udatasel;
1029 regs->tf_es = _udatasel;
1030 regs->tf_fs = _udatasel;
1031 regs->tf_cs = _ucodesel;
1032
1033 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
1034 regs->tf_ebx = ps_strings;
1035
1036 /*
1037 * Reset the hardware debug registers if they were in use.
1038 * They won't have any meaning for the newly exec'd process.
1039 */
1040 if (pcb->pcb_flags & PCB_DBREGS) {
1041 pcb->pcb_dr0 = 0;
1042 pcb->pcb_dr1 = 0;
1043 pcb->pcb_dr2 = 0;
1044 pcb->pcb_dr3 = 0;
1045 pcb->pcb_dr6 = 0;
1046 pcb->pcb_dr7 = 0;
1047 if (pcb == curpcb) {
1048 /*
1049 * Clear the debug registers on the running
1050 * CPU, otherwise they will end up affecting
1051 * the next process we switch to.
1052 */
1053 reset_dbregs();
1054 }
1055 pcb->pcb_flags &= ~PCB_DBREGS;
1056 }
1057
1058 /*
1059 * Initialize the math emulator (if any) for the current process.
1060 * Actually, just clear the bit that says that the emulator has
1061 * been initialized. Initialization is delayed until the process
1062 * traps to the emulator (if it is done at all) mainly because
1063 * emulators don't provide an entry point for initialization.
1064 */
1065 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP;
1066
1067 /*
1068 * Arrange to trap the next npx or `fwait' instruction (see npx.c
1069 * for why fwait must be trapped at least if there is an npx or an
1070 * emulator). This is mainly to handle the case where npx0 is not
1071 * configured, since the npx routines normally set up the trap
1072 * otherwise. It should be done only at boot time, but doing it
1073 * here allows modifying `npx_exists' for testing the emulator on
1074 * systems with an npx.
1075 */
1076 load_cr0(rcr0() | CR0_MP | CR0_TS);
1077
1078#if NNPX > 0
1079 /* Initialize the npx (if any) for the current process. */
1080 npxinit(__INITIAL_NPXCW__);
1081#endif
1082
1083 /*
1084 * XXX - Linux emulator
1085 * Make sure sure edx is 0x0 on entry. Linux binaries depend
1086 * on it.
1087 */
1088 p->p_retval[1] = 0;
1089}
1090
1091void
1092cpu_setregs(void)
1093{
1094 unsigned int cr0;
1095
1096 cr0 = rcr0();
1097 cr0 |= CR0_NE; /* Done by npxinit() */
1098 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
1099#ifdef I386_CPU
1100 if (cpu_class != CPUCLASS_386)
1101#endif
1102 cr0 |= CR0_WP | CR0_AM;
1103 load_cr0(cr0);
1104 load_gs(_udatasel);
1105}
1106
1107static int
1108sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
1109{
1110 int error;
1111 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
1112 req);
1113 if (!error && req->newptr)
1114 resettodr();
1115 return (error);
1116}
1117
1118SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
1119 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
1120
1121SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
1122 CTLFLAG_RW, &disable_rtc_set, 0, "");
1123
1124SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo,
1125 CTLFLAG_RD, &bootinfo, bootinfo, "");
1126
1127SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
1128 CTLFLAG_RW, &wall_cmos_clock, 0, "");
1129
1130extern u_long bootdev; /* not a dev_t - encoding is different */
1131SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
1132 CTLFLAG_RD, &bootdev, 0, "Boot device (not in dev_t format)");
1133
1134/*
1135 * Initialize 386 and configure to run kernel
1136 */
1137
1138/*
1139 * Initialize segments & interrupt table
1140 */
1141
1142int _default_ldt;
1143union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */
1144static struct gate_descriptor idt0[NIDT];
1145struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */
1146union descriptor ldt[NLDT]; /* local descriptor table */
1147#ifdef SMP
1148/* table descriptors - used to load tables by microp */
1149struct region_descriptor r_gdt, r_idt;
1150#endif
1151
1152#ifndef SMP
1153extern struct segment_descriptor common_tssd, *tss_gdt;
1154#endif
1155int private_tss; /* flag indicating private tss */
1156
1157#if defined(I586_CPU) && !defined(NO_F00F_HACK)
1158extern int has_f00f_bug;
1159#endif
1160
1161static struct i386tss dblfault_tss;
1162static char dblfault_stack[PAGE_SIZE];
1163
1164extern struct user *proc0paddr;
1165
1166
1167/* software prototypes -- in more palatable form */
1168struct soft_segment_descriptor gdt_segs[] = {
1169/* GNULL_SEL 0 Null Descriptor */
1170{ 0x0, /* segment base address */
1171 0x0, /* length */
1172 0, /* segment type */
1173 0, /* segment descriptor priority level */
1174 0, /* segment descriptor present */
1175 0, 0,
1176 0, /* default 32 vs 16 bit size */
1177 0 /* limit granularity (byte/page units)*/ },
1178/* GCODE_SEL 1 Code Descriptor for kernel */
1179{ 0x0, /* segment base address */
1180 0xfffff, /* length - all address space */
1181 SDT_MEMERA, /* segment type */
1182 0, /* segment descriptor priority level */
1183 1, /* segment descriptor present */
1184 0, 0,
1185 1, /* default 32 vs 16 bit size */
1186 1 /* limit granularity (byte/page units)*/ },
1187/* GDATA_SEL 2 Data Descriptor for kernel */
1188{ 0x0, /* segment base address */
1189 0xfffff, /* length - all address space */
1190 SDT_MEMRWA, /* segment type */
1191 0, /* segment descriptor priority level */
1192 1, /* segment descriptor present */
1193 0, 0,
1194 1, /* default 32 vs 16 bit size */
1195 1 /* limit granularity (byte/page units)*/ },
1196/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */
1197{ 0x0, /* segment base address */
1198 0xfffff, /* length - all address space */
1199 SDT_MEMRWA, /* segment type */
1200 0, /* segment descriptor priority level */
1201 1, /* segment descriptor present */
1202 0, 0,
1203 1, /* default 32 vs 16 bit size */
1204 1 /* limit granularity (byte/page units)*/ },
1205/* GPROC0_SEL 4 Proc 0 Tss Descriptor */
1206{
1207 0x0, /* segment base address */
1208 sizeof(struct i386tss)-1,/* length - all address space */
1209 SDT_SYS386TSS, /* segment type */
1210 0, /* segment descriptor priority level */
1211 1, /* segment descriptor present */
1212 0, 0,
1213 0, /* unused - default 32 vs 16 bit size */
1214 0 /* limit granularity (byte/page units)*/ },
1215/* GLDT_SEL 5 LDT Descriptor */
1216{ (int) ldt, /* segment base address */
1217 sizeof(ldt)-1, /* length - all address space */
1218 SDT_SYSLDT, /* segment type */
1219 SEL_UPL, /* segment descriptor priority level */
1220 1, /* segment descriptor present */
1221 0, 0,
1222 0, /* unused - default 32 vs 16 bit size */
1223 0 /* limit granularity (byte/page units)*/ },
1224/* GUSERLDT_SEL 6 User LDT Descriptor per process */
1225{ (int) ldt, /* segment base address */
1226 (512 * sizeof(union descriptor)-1), /* length */
1227 SDT_SYSLDT, /* segment type */
1228 0, /* segment descriptor priority level */
1229 1, /* segment descriptor present */
1230 0, 0,
1231 0, /* unused - default 32 vs 16 bit size */
1232 0 /* limit granularity (byte/page units)*/ },
1233/* GTGATE_SEL 7 Null Descriptor - Placeholder */
1234{ 0x0, /* segment base address */
1235 0x0, /* length - all address space */
1236 0, /* segment type */
1237 0, /* segment descriptor priority level */
1238 0, /* segment descriptor present */
1239 0, 0,
1240 0, /* default 32 vs 16 bit size */
1241 0 /* limit granularity (byte/page units)*/ },
1242/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
1243{ 0x400, /* segment base address */
1244 0xfffff, /* length */
1245 SDT_MEMRWA, /* segment type */
1246 0, /* segment descriptor priority level */
1247 1, /* segment descriptor present */
1248 0, 0,
1249 1, /* default 32 vs 16 bit size */
1250 1 /* limit granularity (byte/page units)*/ },
1251/* GPANIC_SEL 9 Panic Tss Descriptor */
1252{ (int) &dblfault_tss, /* segment base address */
1253 sizeof(struct i386tss)-1,/* length - all address space */
1254 SDT_SYS386TSS, /* segment type */
1255 0, /* segment descriptor priority level */
1256 1, /* segment descriptor present */
1257 0, 0,
1258 0, /* unused - default 32 vs 16 bit size */
1259 0 /* limit granularity (byte/page units)*/ },
1260/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */
1261{ 0, /* segment base address (overwritten) */
1262 0xfffff, /* length */
1263 SDT_MEMERA, /* segment type */
1264 0, /* segment descriptor priority level */
1265 1, /* segment descriptor present */
1266 0, 0,
1267 0, /* default 32 vs 16 bit size */
1268 1 /* limit granularity (byte/page units)*/ },
1269/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */
1270{ 0, /* segment base address (overwritten) */
1271 0xfffff, /* length */
1272 SDT_MEMERA, /* segment type */
1273 0, /* segment descriptor priority level */
1274 1, /* segment descriptor present */
1275 0, 0,
1276 0, /* default 32 vs 16 bit size */
1277 1 /* limit granularity (byte/page units)*/ },
1278/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */
1279{ 0, /* segment base address (overwritten) */
1280 0xfffff, /* length */
1281 SDT_MEMRWA, /* segment type */
1282 0, /* segment descriptor priority level */
1283 1, /* segment descriptor present */
1284 0, 0,
1285 1, /* default 32 vs 16 bit size */
1286 1 /* limit granularity (byte/page units)*/ },
1287/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */
1288{ 0, /* segment base address (overwritten) */
1289 0xfffff, /* length */
1290 SDT_MEMRWA, /* segment type */
1291 0, /* segment descriptor priority level */
1292 1, /* segment descriptor present */
1293 0, 0,
1294 0, /* default 32 vs 16 bit size */
1295 1 /* limit granularity (byte/page units)*/ },
1296/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */
1297{ 0, /* segment base address (overwritten) */
1298 0xfffff, /* length */
1299 SDT_MEMRWA, /* segment type */
1300 0, /* segment descriptor priority level */
1301 1, /* segment descriptor present */
1302 0, 0,
1303 0, /* default 32 vs 16 bit size */
1304 1 /* limit granularity (byte/page units)*/ },
1305};
1306
1307static struct soft_segment_descriptor ldt_segs[] = {
1308 /* Null Descriptor - overwritten by call gate */
1309{ 0x0, /* segment base address */
1310 0x0, /* length - all address space */
1311 0, /* segment type */
1312 0, /* segment descriptor priority level */
1313 0, /* segment descriptor present */
1314 0, 0,
1315 0, /* default 32 vs 16 bit size */
1316 0 /* limit granularity (byte/page units)*/ },
1317 /* Null Descriptor - overwritten by call gate */
1318{ 0x0, /* segment base address */
1319 0x0, /* length - all address space */
1320 0, /* segment type */
1321 0, /* segment descriptor priority level */
1322 0, /* segment descriptor present */
1323 0, 0,
1324 0, /* default 32 vs 16 bit size */
1325 0 /* limit granularity (byte/page units)*/ },
1326 /* Null Descriptor - overwritten by call gate */
1327{ 0x0, /* segment base address */
1328 0x0, /* length - all address space */
1329 0, /* segment type */
1330 0, /* segment descriptor priority level */
1331 0, /* segment descriptor present */
1332 0, 0,
1333 0, /* default 32 vs 16 bit size */
1334 0 /* limit granularity (byte/page units)*/ },
1335 /* Code Descriptor for user */
1336{ 0x0, /* segment base address */
1337 0xfffff, /* length - all address space */
1338 SDT_MEMERA, /* segment type */
1339 SEL_UPL, /* segment descriptor priority level */
1340 1, /* segment descriptor present */
1341 0, 0,
1342 1, /* default 32 vs 16 bit size */
1343 1 /* limit granularity (byte/page units)*/ },
1344 /* Null Descriptor - overwritten by call gate */
1345{ 0x0, /* segment base address */
1346 0x0, /* length - all address space */
1347 0, /* segment type */
1348 0, /* segment descriptor priority level */
1349 0, /* segment descriptor present */
1350 0, 0,
1351 0, /* default 32 vs 16 bit size */
1352 0 /* limit granularity (byte/page units)*/ },
1353 /* Data Descriptor for user */
1354{ 0x0, /* segment base address */
1355 0xfffff, /* length - all address space */
1356 SDT_MEMRWA, /* segment type */
1357 SEL_UPL, /* segment descriptor priority level */
1358 1, /* segment descriptor present */
1359 0, 0,
1360 1, /* default 32 vs 16 bit size */
1361 1 /* limit granularity (byte/page units)*/ },
1362};
1363
1364void
1365setidt(idx, func, typ, dpl, selec)
1366 int idx;
1367 inthand_t *func;
1368 int typ;
1369 int dpl;
1370 int selec;
1371{
1372 struct gate_descriptor *ip;
1373
1374 ip = idt + idx;
1375 ip->gd_looffset = (int)func;
1376 ip->gd_selector = selec;
1377 ip->gd_stkcpy = 0;
1378 ip->gd_xx = 0;
1379 ip->gd_type = typ;
1380 ip->gd_dpl = dpl;
1381 ip->gd_p = 1;
1382 ip->gd_hioffset = ((int)func)>>16 ;
1383}
1384
1385#define IDTVEC(name) __CONCAT(X,name)
1386
1387extern inthand_t
1388 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
1389 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
1390 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
1391 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
1392 IDTVEC(xmm), IDTVEC(syscall), IDTVEC(int0x80_syscall);
1393
1394void
1395sdtossd(sd, ssd)
1396 struct segment_descriptor *sd;
1397 struct soft_segment_descriptor *ssd;
1398{
1399 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase;
1400 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
1401 ssd->ssd_type = sd->sd_type;
1402 ssd->ssd_dpl = sd->sd_dpl;
1403 ssd->ssd_p = sd->sd_p;
1404 ssd->ssd_def32 = sd->sd_def32;
1405 ssd->ssd_gran = sd->sd_gran;
1406}
1407
1408#define PHYSMAP_SIZE (2 * 8)
1409
1410/*
1411 * Populate the (physmap) array with base/bound pairs describing the
1412 * available physical memory in the system, then test this memory and
1413 * build the phys_avail array describing the actually-available memory.
1414 *
1415 * If we cannot accurately determine the physical memory map, then use
1416 * value from the 0xE801 call, and failing that, the RTC.
1417 *
1418 * Total memory size may be set by the kernel environment variable
1419 * hw.physmem or the compile-time define MAXMEM.
1420 */
1421static void
1422getmemsize(int first)
1423{
1424 int i, physmap_idx, pa_indx;
1425 int hasbrokenint12;
1426 u_int basemem, extmem;
1427 struct vm86frame vmf;
1428 struct vm86context vmc;
1429 vm_offset_t pa, physmap[PHYSMAP_SIZE];
1430 pt_entry_t pte;
1431 const char *cp;
1432 struct {
1433 u_int64_t base;
1434 u_int64_t length;
1435 u_int32_t type;
1436 } *smap;
1437
1438 hasbrokenint12 = 0;
1439 TUNABLE_INT_FETCH("hw.hasbrokenint12", &hasbrokenint12);
1440 bzero(&vmf, sizeof(struct vm86frame));
1441 bzero(physmap, sizeof(physmap));
1442 basemem = 0;
1443
1444 /*
1445 * Some newer BIOSes has broken INT 12H implementation which cause
1446 * kernel panic immediately. In this case, we need to scan SMAP
1447 * with INT 15:E820 first, then determine base memory size.
1448 */
1449 if (hasbrokenint12) {
1450 goto int15e820;
1451 }
1452
1453 /*
1454 * Perform "base memory" related probes & setup
1455 */
1456 vm86_intcall(0x12, &vmf);
1457 basemem = vmf.vmf_ax;
1458 if (basemem > 640) {
1459 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1460 basemem);
1461 basemem = 640;
1462 }
1463
1464 /*
1465 * XXX if biosbasemem is now < 640, there is a `hole'
1466 * between the end of base memory and the start of
1467 * ISA memory. The hole may be empty or it may
1468 * contain BIOS code or data. Map it read/write so
1469 * that the BIOS can write to it. (Memory from 0 to
1470 * the physical end of the kernel is mapped read-only
1471 * to begin with and then parts of it are remapped.
1472 * The parts that aren't remapped form holes that
1473 * remain read-only and are unused by the kernel.
1474 * The base memory area is below the physical end of
1475 * the kernel and right now forms a read-only hole.
1476 * The part of it from PAGE_SIZE to
1477 * (trunc_page(biosbasemem * 1024) - 1) will be
1478 * remapped and used by the kernel later.)
1479 *
1480 * This code is similar to the code used in
1481 * pmap_mapdev, but since no memory needs to be
1482 * allocated we simply change the mapping.
1483 */
1484 for (pa = trunc_page(basemem * 1024);
1485 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1486 pte = (pt_entry_t)vtopte(pa + KERNBASE);
1487 *pte = pa | PG_RW | PG_V;
1488 }
1489
1490 /*
1491 * if basemem != 640, map pages r/w into vm86 page table so
1492 * that the bios can scribble on it.
1493 */
1494 pte = (pt_entry_t)vm86paddr;
1495 for (i = basemem / 4; i < 160; i++)
1496 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1497
1498int15e820:
1499 /*
1500 * map page 1 R/W into the kernel page table so we can use it
1501 * as a buffer. The kernel will unmap this page later.
1502 */
1503 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT));
1504 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V;
1505
1506 /*
1507 * get memory map with INT 15:E820
1508 */
1509#define SMAPSIZ sizeof(*smap)
1510#define SMAP_SIG 0x534D4150 /* 'SMAP' */
1511
1512 vmc.npages = 0;
1513 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT));
1514 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di);
1515
1516 physmap_idx = 0;
1517 vmf.vmf_ebx = 0;
1518 do {
1519 vmf.vmf_eax = 0xE820;
1520 vmf.vmf_edx = SMAP_SIG;
1521 vmf.vmf_ecx = SMAPSIZ;
1522 i = vm86_datacall(0x15, &vmf, &vmc);
1523 if (i || vmf.vmf_eax != SMAP_SIG)
1524 break;
1525 if (boothowto & RB_VERBOSE)
1526 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n",
1527 smap->type,
1528 *(u_int32_t *)((char *)&smap->base + 4),
1529 (u_int32_t)smap->base,
1530 *(u_int32_t *)((char *)&smap->length + 4),
1531 (u_int32_t)smap->length);
1532
1533 if (smap->type != 0x01)
1534 goto next_run;
1535
1536 if (smap->length == 0)
1537 goto next_run;
1538
1539 if (smap->base >= 0xffffffff) {
1540 printf("%uK of memory above 4GB ignored\n",
1541 (u_int)(smap->length / 1024));
1542 goto next_run;
1543 }
1544
1545 for (i = 0; i <= physmap_idx; i += 2) {
1546 if (smap->base < physmap[i + 1]) {
1547 if (boothowto & RB_VERBOSE)
1548 printf(
1549 "Overlapping or non-montonic memory region, ignoring second region\n");
1550 goto next_run;
1551 }
1552 }
1553
1554 if (smap->base == physmap[physmap_idx + 1]) {
1555 physmap[physmap_idx + 1] += smap->length;
1556 goto next_run;
1557 }
1558
1559 physmap_idx += 2;
1560 if (physmap_idx == PHYSMAP_SIZE) {
1561 printf(
1562 "Too many segments in the physical address map, giving up\n");
1563 break;
1564 }
1565 physmap[physmap_idx] = smap->base;
1566 physmap[physmap_idx + 1] = smap->base + smap->length;
1567next_run:
1568 } while (vmf.vmf_ebx != 0);
1569
1570 /*
1571 * Perform "base memory" related probes & setup based on SMAP
1572 */
1573 if (basemem == 0) {
1574 for (i = 0; i <= physmap_idx; i += 2) {
1575 if (physmap[i] == 0x00000000) {
1576 basemem = physmap[i + 1] / 1024;
1577 break;
1578 }
1579 }
1580
1581 if (basemem == 0) {
1582 basemem = 640;
1583 }
1584
1585 if (basemem > 640) {
1586 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
1587 basemem);
1588 basemem = 640;
1589 }
1590
1591 for (pa = trunc_page(basemem * 1024);
1592 pa < ISA_HOLE_START; pa += PAGE_SIZE) {
1593 pte = (pt_entry_t)vtopte(pa + KERNBASE);
1594 *pte = pa | PG_RW | PG_V;
1595 }
1596
1597 pte = (pt_entry_t)vm86paddr;
1598 for (i = basemem / 4; i < 160; i++)
1599 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
1600 }
1601
1602 if (physmap[1] != 0)
1603 goto physmap_done;
1604
1605 /*
1606 * If we failed above, try memory map with INT 15:E801
1607 */
1608 vmf.vmf_ax = 0xE801;
1609 if (vm86_intcall(0x15, &vmf) == 0) {
1610 extmem = vmf.vmf_cx + vmf.vmf_dx * 64;
1611 } else {
1612#if 0
1613 vmf.vmf_ah = 0x88;
1614 vm86_intcall(0x15, &vmf);
1615 extmem = vmf.vmf_ax;
1616#else
1617 /*
1618 * Prefer the RTC value for extended memory.
1619 */
1620 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8);
1621#endif
1622 }
1623
1624 /*
1625 * Special hack for chipsets that still remap the 384k hole when
1626 * there's 16MB of memory - this really confuses people that
1627 * are trying to use bus mastering ISA controllers with the
1628 * "16MB limit"; they only have 16MB, but the remapping puts
1629 * them beyond the limit.
1630 *
1631 * If extended memory is between 15-16MB (16-17MB phys address range),
1632 * chop it to 15MB.
1633 */
1634 if ((extmem > 15 * 1024) && (extmem < 16 * 1024))
1635 extmem = 15 * 1024;
1636
1637 physmap[0] = 0;
1638 physmap[1] = basemem * 1024;
1639 physmap_idx = 2;
1640 physmap[physmap_idx] = 0x100000;
1641 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
1642
1643physmap_done:
1644 /*
1645 * Now, physmap contains a map of physical memory.
1646 */
1647
1648#ifdef SMP
1649 /* make hole for AP bootstrap code */
1650 physmap[1] = mp_bootaddress(physmap[1] / 1024);
1651
1652 /* look for the MP hardware - needed for apic addresses */
1653 mp_probe();
1654#endif
1655
1656 /*
1657 * Maxmem isn't the "maximum memory", it's one larger than the
1658 * highest page of the physical address space. It should be
1659 * called something like "Maxphyspage". We may adjust this
1660 * based on ``hw.physmem'' and the results of the memory test.
1661 */
1662 Maxmem = atop(physmap[physmap_idx + 1]);
1663
1664#ifdef MAXMEM
1665 Maxmem = MAXMEM / 4;
1666#endif
1667
1668 /*
1669 * hw.maxmem is a size in bytes; we also allow k, m, and g suffixes
1670 * for the appropriate modifiers. This overrides MAXMEM.
1671 */
1672 if ((cp = getenv("hw.physmem")) != NULL) {
1673 u_int64_t AllowMem, sanity;
1674 char *ep;
1675
1676 sanity = AllowMem = strtouq(cp, &ep, 0);
1677 if ((ep != cp) && (*ep != 0)) {
1678 switch(*ep) {
1679 case 'g':
1680 case 'G':
1681 AllowMem <<= 10;
1682 case 'm':
1683 case 'M':
1684 AllowMem <<= 10;
1685 case 'k':
1686 case 'K':
1687 AllowMem <<= 10;
1688 break;
1689 default:
1690 AllowMem = sanity = 0;
1691 }
1692 if (AllowMem < sanity)
1693 AllowMem = 0;
1694 }
1695 if (AllowMem == 0)
1696 printf("Ignoring invalid memory size of '%s'\n", cp);
1697 else
1698 Maxmem = atop(AllowMem);
1699 }
1700
1701 if (atop(physmap[physmap_idx + 1]) != Maxmem &&
1702 (boothowto & RB_VERBOSE))
1703 printf("Physical memory use set to %uK\n", Maxmem * 4);
1704
1705 /*
1706 * If Maxmem has been increased beyond what the system has detected,
1707 * extend the last memory segment to the new limit.
1708 */
1709 if (atop(physmap[physmap_idx + 1]) < Maxmem)
1710 physmap[physmap_idx + 1] = ptoa(Maxmem);
1711
1712 /* call pmap initialization to make new kernel address space */
1713 pmap_bootstrap(first, 0);
1714
1715 /*
1716 * Size up each available chunk of physical memory.
1717 */
1718 physmap[0] = PAGE_SIZE; /* mask off page 0 */
1719 pa_indx = 0;
1720 phys_avail[pa_indx++] = physmap[0];
1721 phys_avail[pa_indx] = physmap[0];
1722#if 0
1723 pte = (pt_entry_t)vtopte(KERNBASE);
1724#else
1725 pte = (pt_entry_t)CMAP1;
1726#endif
1727
1728 /*
1729 * physmap is in bytes, so when converting to page boundaries,
1730 * round up the start address and round down the end address.
1731 */
1732 for (i = 0; i <= physmap_idx; i += 2) {
1733 vm_offset_t end;
1734
1735 end = ptoa(Maxmem);
1736 if (physmap[i + 1] < end)
1737 end = trunc_page(physmap[i + 1]);
1738 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
1739 int tmp, page_bad;
1740#if 0
1741 int *ptr = 0;
1742#else
1743 int *ptr = (int *)CADDR1;
1744#endif
1745
1746 /*
1747 * block out kernel memory as not available.
1748 */
1749 if (pa >= 0x100000 && pa < first)
1750 continue;
1751
1752 page_bad = FALSE;
1753
1754 /*
1755 * map page into kernel: valid, read/write,non-cacheable
1756 */
1757 *pte = pa | PG_V | PG_RW | PG_N;
1758 invltlb();
1759
1760 tmp = *(int *)ptr;
1761 /*
1762 * Test for alternating 1's and 0's
1763 */
1764 *(volatile int *)ptr = 0xaaaaaaaa;
1765 if (*(volatile int *)ptr != 0xaaaaaaaa) {
1766 page_bad = TRUE;
1767 }
1768 /*
1769 * Test for alternating 0's and 1's
1770 */
1771 *(volatile int *)ptr = 0x55555555;
1772 if (*(volatile int *)ptr != 0x55555555) {
1773 page_bad = TRUE;
1774 }
1775 /*
1776 * Test for all 1's
1777 */
1778 *(volatile int *)ptr = 0xffffffff;
1779 if (*(volatile int *)ptr != 0xffffffff) {
1780 page_bad = TRUE;
1781 }
1782 /*
1783 * Test for all 0's
1784 */
1785 *(volatile int *)ptr = 0x0;
1786 if (*(volatile int *)ptr != 0x0) {
1787 page_bad = TRUE;
1788 }
1789 /*
1790 * Restore original value.
1791 */
1792 *(int *)ptr = tmp;
1793
1794 /*
1795 * Adjust array of valid/good pages.
1796 */
1797 if (page_bad == TRUE) {
1798 continue;
1799 }
1800 /*
1801 * If this good page is a continuation of the
1802 * previous set of good pages, then just increase
1803 * the end pointer. Otherwise start a new chunk.
1804 * Note that "end" points one higher than end,
1805 * making the range >= start and < end.
1806 * If we're also doing a speculative memory
1807 * test and we at or past the end, bump up Maxmem
1808 * so that we keep going. The first bad page
1809 * will terminate the loop.
1810 */
1811 if (phys_avail[pa_indx] == pa) {
1812 phys_avail[pa_indx] += PAGE_SIZE;
1813 } else {
1814 pa_indx++;
1815 if (pa_indx == PHYS_AVAIL_ARRAY_END) {
1816 printf("Too many holes in the physical address space, giving up\n");
1817 pa_indx--;
1818 break;
1819 }
1820 phys_avail[pa_indx++] = pa; /* start */
1821 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
1822 }
1823 physmem++;
1824 }
1825 }
1826 *pte = 0;
1827 invltlb();
1828
1829 /*
1830 * XXX
1831 * The last chunk must contain at least one page plus the message
1832 * buffer to avoid complicating other code (message buffer address
1833 * calculation, etc.).
1834 */
1835 while (phys_avail[pa_indx - 1] + PAGE_SIZE +
1836 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) {
1837 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
1838 phys_avail[pa_indx--] = 0;
1839 phys_avail[pa_indx--] = 0;
1840 }
1841
1842 Maxmem = atop(phys_avail[pa_indx]);
1843
1844 /* Trim off space for the message buffer. */
1845 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE);
1846
1847 avail_end = phys_avail[pa_indx];
1848}
1849
1850void
1851init386(first)
1852 int first;
1853{
1854 struct gate_descriptor *gdp;
1855 int gsel_tss, metadata_missing, off, x;
1856#ifndef SMP
1857 /* table descriptors - used to load tables by microp */
1858 struct region_descriptor r_gdt, r_idt;
1859#endif
1860
1861 /*
1862 * Prevent lowering of the ipl if we call tsleep() early.
1863 */
1864 safepri = cpl;
1865
1866 proc0.p_addr = proc0paddr;
1867
1868 atdevbase = ISA_HOLE_START + KERNBASE;
1869
1870 metadata_missing = 0;
1871 if (bootinfo.bi_modulep) {
1872 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
1873 preload_bootstrap_relocate(KERNBASE);
1874 } else {
1875 metadata_missing = 1;
1876 }
1877 if (bootinfo.bi_envp)
1878 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
1879
1880 /* Init basic tunables, hz etc */
1881 init_param1();
1882
1883 /*
1884 * make gdt memory segments, the code segment goes up to end of the
1885 * page with etext in it, the data segment goes to the end of
1886 * the address space
1887 */
1888 /*
1889 * XXX text protection is temporarily (?) disabled. The limit was
1890 * i386_btop(round_page(etext)) - 1.
1891 */
1892 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
1893 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
1894#ifdef SMP
1895 gdt_segs[GPRIV_SEL].ssd_limit =
1896 atop(sizeof(struct privatespace) - 1);
1897 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0];
1898 gdt_segs[GPROC0_SEL].ssd_base =
1899 (int) &SMP_prvspace[0].globaldata.gd_common_tss;
1900 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0];
1901#else
1902 gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1);
1903 gdt_segs[GPROC0_SEL].ssd_base = (int) &common_tss;
1904#endif
1905
1906 for (x = 0; x < NGDT; x++) {
1907#ifdef BDE_DEBUGGER
1908 /* avoid overwriting db entries with APM ones */
1909 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL)
1910 continue;
1911#endif
1912 ssdtosd(&gdt_segs[x], &gdt[x].sd);
1913 }
1914
1915 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
1916 r_gdt.rd_base = (int) gdt;
1917 lgdt(&r_gdt);
1918
1919 /* make ldt memory segments */
1920 /*
1921 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it
1922 * should be spelled ...MAX_USER...
1923 */
1924 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1925 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1);
1926 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
1927 ssdtosd(&ldt_segs[x], &ldt[x].sd);
1928
1929 _default_ldt = GSEL(GLDT_SEL, SEL_KPL);
1930 lldt(_default_ldt);
1931#ifdef USER_LDT
1932 currentldt = _default_ldt;
1933#endif
1934
1935 /* exceptions */
1936 for (x = 0; x < NIDT; x++)
1937 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1938 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1939 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1940 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1941 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1942 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1943 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1944 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1945 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1946 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
1947 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1948 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1949 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1950 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1951 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1952 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1953 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1954 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1955 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1956 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1957 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1958 setidt(0x80, &IDTVEC(int0x80_syscall),
1959 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL));
1960
1961 r_idt.rd_limit = sizeof(idt0) - 1;
1962 r_idt.rd_base = (int) idt;
1963 lidt(&r_idt);
1964
1965 /*
1966 * Initialize the console before we print anything out.
1967 */
1968 cninit();
1969
1970 if (metadata_missing)
1971 printf("WARNING: loader(8) metadata is missing!\n");
1972
1973#include "isa.h"
1974#if NISA >0
1975 isa_defaultirq();
1976#endif
1977 rand_initialize();
1978
1979#ifdef DDB
1980 kdb_init();
1981 if (boothowto & RB_KDB)
1982 Debugger("Boot flags requested debugger");
1983#endif
1984
1985 finishidentcpu(); /* Final stage of CPU initialization */
1986 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1987 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
1988 initializecpu(); /* Initialize CPU registers */
1989
1990 /* make an initial tss so cpu can get interrupt stack on syscall! */
1991 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16;
1992 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
1993 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
1994 private_tss = 0;
1995 tss_gdt = &gdt[GPROC0_SEL].sd;
1996 common_tssd = *tss_gdt;
1997 common_tss.tss_ioopt = (sizeof common_tss) << 16;
1998 ltr(gsel_tss);
1999
2000 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
2001 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)];
2002 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
2003 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
2004 dblfault_tss.tss_cr3 = (int)IdlePTD;
2005 dblfault_tss.tss_eip = (int) dblfault_handler;
2006 dblfault_tss.tss_eflags = PSL_KERNEL;
2007 dblfault_tss.tss_ds = dblfault_tss.tss_es =
2008 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
2009 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
2010 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
2011 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
2012
2013 vm86_initialize();
2014 getmemsize(first);
2015 init_param2(physmem);
2016
2017 /* now running on new page tables, configured,and u/iom is accessible */
2018
2019 /* Map the message buffer. */
2020 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
2021 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
2022
2023 msgbufinit(msgbufp, MSGBUF_SIZE);
2024
2025 /* make a call gate to reenter kernel with */
2026 gdp = &ldt[LSYS5CALLS_SEL].gd;
2027
2028 x = (int) &IDTVEC(syscall);
2029 gdp->gd_looffset = x++;
2030 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
2031 gdp->gd_stkcpy = 1;
2032 gdp->gd_type = SDT_SYS386CGT;
2033 gdp->gd_dpl = SEL_UPL;
2034 gdp->gd_p = 1;
2035 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16;
2036
2037 /* XXX does this work? */
2038 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
2039 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
2040
2041 /* transfer to user mode */
2042
2043 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
2044 _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
2045
2046 /* setup proc 0's pcb */
2047 proc0.p_addr->u_pcb.pcb_flags = 0;
2048 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD;
2049#ifdef SMP
2050 proc0.p_addr->u_pcb.pcb_mpnest = 1;
2051#endif
2052 proc0.p_addr->u_pcb.pcb_ext = 0;
2053 proc0.p_md.md_regs = &proc0_tf;
2054}
2055
2056#if defined(I586_CPU) && !defined(NO_F00F_HACK)
2057static void f00f_hack(void *unused);
2058SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
2059
2060static void
2061f00f_hack(void *unused) {
2062 struct gate_descriptor *new_idt;
2063#ifndef SMP
2064 struct region_descriptor r_idt;
2065#endif
2066 vm_offset_t tmp;
2067
2068 if (!has_f00f_bug)
2069 return;
2070
2071 printf("Intel Pentium detected, installing workaround for F00F bug\n");
2072
2073 r_idt.rd_limit = sizeof(idt0) - 1;
2074
2075 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2);
2076 if (tmp == 0)
2077 panic("kmem_alloc returned 0");
2078 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0)
2079 panic("kmem_alloc returned non-page-aligned memory");
2080 /* Put the first seven entries in the lower page */
2081 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8));
2082 bcopy(idt, new_idt, sizeof(idt0));
2083 r_idt.rd_base = (int)new_idt;
2084 lidt(&r_idt);
2085 idt = new_idt;
2086 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE,
2087 VM_PROT_READ, FALSE) != KERN_SUCCESS)
2088 panic("vm_map_protect failed");
2089 return;
2090}
2091#endif /* defined(I586_CPU) && !NO_F00F_HACK */
2092
2093int
2094ptrace_set_pc(p, addr)
2095 struct proc *p;
2096 unsigned long addr;
2097{
2098 p->p_md.md_regs->tf_eip = addr;
2099 return (0);
2100}
2101
2102int
2103ptrace_single_step(p)
2104 struct proc *p;
2105{
2106 p->p_md.md_regs->tf_eflags |= PSL_T;
2107 return (0);
2108}
2109
2110int ptrace_read_u_check(p, addr, len)
2111 struct proc *p;
2112 vm_offset_t addr;
2113 size_t len;
2114{
2115 vm_offset_t gap;
2116
2117 if ((vm_offset_t) (addr + len) < addr)
2118 return EPERM;
2119 if ((vm_offset_t) (addr + len) <= sizeof(struct user))
2120 return 0;
2121
2122 gap = (char *) p->p_md.md_regs - (char *) p->p_addr;
2123
2124 if ((vm_offset_t) addr < gap)
2125 return EPERM;
2126 if ((vm_offset_t) (addr + len) <=
2127 (vm_offset_t) (gap + sizeof(struct trapframe)))
2128 return 0;
2129 return EPERM;
2130}
2131
2132int ptrace_write_u(p, off, data)
2133 struct proc *p;
2134 vm_offset_t off;
2135 long data;
2136{
2137 struct trapframe frame_copy;
2138 vm_offset_t min;
2139 struct trapframe *tp;
2140
2141 /*
2142 * Privileged kernel state is scattered all over the user area.
2143 * Only allow write access to parts of regs and to fpregs.
2144 */
2145 min = (char *)p->p_md.md_regs - (char *)p->p_addr;
2146 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) {
2147 tp = p->p_md.md_regs;
2148 frame_copy = *tp;
2149 *(int *)((char *)&frame_copy + (off - min)) = data;
2150 if (!EFL_SECURE(frame_copy.tf_eflags, tp->tf_eflags) ||
2151 !CS_SECURE(frame_copy.tf_cs))
2152 return (EINVAL);
2153 *(int*)((char *)p->p_addr + off) = data;
2154 return (0);
2155 }
2156 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_save);
2157 if (off >= min && off <= min + sizeof(union savefpu) - sizeof(int)) {
2158 *(int*)((char *)p->p_addr + off) = data;
2159 return (0);
2160 }
2161 return (EFAULT);
2162}
2163
2164int
2165fill_regs(p, regs)
2166 struct proc *p;
2167 struct reg *regs;
2168{
2169 struct pcb *pcb;
2170 struct trapframe *tp;
2171
2172 tp = p->p_md.md_regs;
2173 regs->r_fs = tp->tf_fs;
2174 regs->r_es = tp->tf_es;
2175 regs->r_ds = tp->tf_ds;
2176 regs->r_edi = tp->tf_edi;
2177 regs->r_esi = tp->tf_esi;
2178 regs->r_ebp = tp->tf_ebp;
2179 regs->r_ebx = tp->tf_ebx;
2180 regs->r_edx = tp->tf_edx;
2181 regs->r_ecx = tp->tf_ecx;
2182 regs->r_eax = tp->tf_eax;
2183 regs->r_eip = tp->tf_eip;
2184 regs->r_cs = tp->tf_cs;
2185 regs->r_eflags = tp->tf_eflags;
2186 regs->r_esp = tp->tf_esp;
2187 regs->r_ss = tp->tf_ss;
2188 pcb = &p->p_addr->u_pcb;
2189 regs->r_gs = pcb->pcb_gs;
2190 return (0);
2191}
2192
2193int
2194set_regs(p, regs)
2195 struct proc *p;
2196 struct reg *regs;
2197{
2198 struct pcb *pcb;
2199 struct trapframe *tp;
2200
2201 tp = p->p_md.md_regs;
2202 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
2203 !CS_SECURE(regs->r_cs))
2204 return (EINVAL);
2205 tp->tf_fs = regs->r_fs;
2206 tp->tf_es = regs->r_es;
2207 tp->tf_ds = regs->r_ds;
2208 tp->tf_edi = regs->r_edi;
2209 tp->tf_esi = regs->r_esi;
2210 tp->tf_ebp = regs->r_ebp;
2211 tp->tf_ebx = regs->r_ebx;
2212 tp->tf_edx = regs->r_edx;
2213 tp->tf_ecx = regs->r_ecx;
2214 tp->tf_eax = regs->r_eax;
2215 tp->tf_eip = regs->r_eip;
2216 tp->tf_cs = regs->r_cs;
2217 tp->tf_eflags = regs->r_eflags;
2218 tp->tf_esp = regs->r_esp;
2219 tp->tf_ss = regs->r_ss;
2220 pcb = &p->p_addr->u_pcb;
2221 pcb->pcb_gs = regs->r_gs;
2222 return (0);
2223}
2224
2225#ifdef CPU_ENABLE_SSE
2226static void
2227fill_fpregs_xmm(sv_xmm, sv_87)
2228 struct savexmm *sv_xmm;
2229 struct save87 *sv_87;
2230{
2231 register struct env87 *penv_87 = &sv_87->sv_env;
2232 register struct envxmm *penv_xmm = &sv_xmm->sv_env;
2233 int i;
2234
2235 /* FPU control/status */
2236 penv_87->en_cw = penv_xmm->en_cw;
2237 penv_87->en_sw = penv_xmm->en_sw;
2238 penv_87->en_tw = penv_xmm->en_tw;
2239 penv_87->en_fip = penv_xmm->en_fip;
2240 penv_87->en_fcs = penv_xmm->en_fcs;
2241 penv_87->en_opcode = penv_xmm->en_opcode;
2242 penv_87->en_foo = penv_xmm->en_foo;
2243 penv_87->en_fos = penv_xmm->en_fos;
2244
2245 /* FPU registers */
2246 for (i = 0; i < 8; ++i)
2247 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
2248
2249 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw;
2250}
2251
2252static void
2253set_fpregs_xmm(sv_87, sv_xmm)
2254 struct save87 *sv_87;
2255 struct savexmm *sv_xmm;
2256{
2257 register struct env87 *penv_87 = &sv_87->sv_env;
2258 register struct envxmm *penv_xmm = &sv_xmm->sv_env;
2259 int i;
2260
2261 /* FPU control/status */
2262 penv_xmm->en_cw = penv_87->en_cw;
2263 penv_xmm->en_sw = penv_87->en_sw;
2264 penv_xmm->en_tw = penv_87->en_tw;
2265 penv_xmm->en_fip = penv_87->en_fip;
2266 penv_xmm->en_fcs = penv_87->en_fcs;
2267 penv_xmm->en_opcode = penv_87->en_opcode;
2268 penv_xmm->en_foo = penv_87->en_foo;
2269 penv_xmm->en_fos = penv_87->en_fos;
2270
2271 /* FPU registers */
2272 for (i = 0; i < 8; ++i)
2273 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
2274
2275 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw;
2276}
2277#endif /* CPU_ENABLE_SSE */
2278
2279int
2280fill_fpregs(p, fpregs)
2281 struct proc *p;
2282 struct fpreg *fpregs;
2283{
2284#ifdef CPU_ENABLE_SSE
2285 if (cpu_fxsr) {
2286 fill_fpregs_xmm(&p->p_addr->u_pcb.pcb_save.sv_xmm,
2287 (struct save87 *)fpregs);
2288 return (0);
2289 }
2290#endif /* CPU_ENABLE_SSE */
2291 bcopy(&p->p_addr->u_pcb.pcb_save.sv_87, fpregs, sizeof *fpregs);
2292 return (0);
2293}
2294
2295int
2296set_fpregs(p, fpregs)
2297 struct proc *p;
2298 struct fpreg *fpregs;
2299{
2300#ifdef CPU_ENABLE_SSE
2301 if (cpu_fxsr) {
2302 set_fpregs_xmm((struct save87 *)fpregs,
2303 &p->p_addr->u_pcb.pcb_save.sv_xmm);
2304 return (0);
2305 }
2306#endif /* CPU_ENABLE_SSE */
2307 bcopy(fpregs, &p->p_addr->u_pcb.pcb_save.sv_87, sizeof *fpregs);
2308 return (0);
2309}
2310
2311int
2312fill_dbregs(p, dbregs)
2313 struct proc *p;
2314 struct dbreg *dbregs;
2315{
2316 struct pcb *pcb;
2317
2318 if (p == NULL) {
2319 dbregs->dr0 = rdr0();
2320 dbregs->dr1 = rdr1();
2321 dbregs->dr2 = rdr2();
2322 dbregs->dr3 = rdr3();
2323 dbregs->dr4 = rdr4();
2324 dbregs->dr5 = rdr5();
2325 dbregs->dr6 = rdr6();
2326 dbregs->dr7 = rdr7();
2327 }
2328 else {
2329 pcb = &p->p_addr->u_pcb;
2330 dbregs->dr0 = pcb->pcb_dr0;
2331 dbregs->dr1 = pcb->pcb_dr1;
2332 dbregs->dr2 = pcb->pcb_dr2;
2333 dbregs->dr3 = pcb->pcb_dr3;
2334 dbregs->dr4 = 0;
2335 dbregs->dr5 = 0;
2336 dbregs->dr6 = pcb->pcb_dr6;
2337 dbregs->dr7 = pcb->pcb_dr7;
2338 }
2339 return (0);
2340}
2341
2342int
2343set_dbregs(p, dbregs)
2344 struct proc *p;
2345 struct dbreg *dbregs;
2346{
2347 struct pcb *pcb;
2348 int i;
2349 u_int32_t mask1, mask2;
2350
2351 if (p == NULL) {
2352 load_dr0(dbregs->dr0);
2353 load_dr1(dbregs->dr1);
2354 load_dr2(dbregs->dr2);
2355 load_dr3(dbregs->dr3);
2356 load_dr4(dbregs->dr4);
2357 load_dr5(dbregs->dr5);
2358 load_dr6(dbregs->dr6);
2359 load_dr7(dbregs->dr7);
2360 }
2361 else {
2362 /*
2363 * Don't let an illegal value for dr7 get set. Specifically,
2364 * check for undefined settings. Setting these bit patterns
2365 * result in undefined behaviour and can lead to an unexpected
2366 * TRCTRAP.
2367 */
2368 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8;
2369 i++, mask1 <<= 2, mask2 <<= 2)
2370 if ((dbregs->dr7 & mask1) == mask2)
2371 return (EINVAL);
2372
2373 pcb = &p->p_addr->u_pcb;
2374
2375 /*
2376 * Don't let a process set a breakpoint that is not within the
2377 * process's address space. If a process could do this, it
2378 * could halt the system by setting a breakpoint in the kernel
2379 * (if ddb was enabled). Thus, we need to check to make sure
2380 * that no breakpoints are being enabled for addresses outside
2381 * process's address space, unless, perhaps, we were called by
2382 * uid 0.
2383 *
2384 * XXX - what about when the watched area of the user's
2385 * address space is written into from within the kernel
2386 * ... wouldn't that still cause a breakpoint to be generated
2387 * from within kernel mode?
2388 */
2389
2390 if (suser(p) != 0) {
2391 if (dbregs->dr7 & 0x3) {
2392 /* dr0 is enabled */
2393 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS)
2394 return (EINVAL);
2395 }
2396
2397 if (dbregs->dr7 & (0x3<<2)) {
2398 /* dr1 is enabled */
2399 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS)
2400 return (EINVAL);
2401 }
2402
2403 if (dbregs->dr7 & (0x3<<4)) {
2404 /* dr2 is enabled */
2405 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS)
2406 return (EINVAL);
2407 }
2408
2409 if (dbregs->dr7 & (0x3<<6)) {
2410 /* dr3 is enabled */
2411 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS)
2412 return (EINVAL);
2413 }
2414 }
2415
2416 pcb->pcb_dr0 = dbregs->dr0;
2417 pcb->pcb_dr1 = dbregs->dr1;
2418 pcb->pcb_dr2 = dbregs->dr2;
2419 pcb->pcb_dr3 = dbregs->dr3;
2420 pcb->pcb_dr6 = dbregs->dr6;
2421 pcb->pcb_dr7 = dbregs->dr7;
2422
2423 pcb->pcb_flags |= PCB_DBREGS;
2424 }
2425
2426 return (0);
2427}
2428
2429/*
2430 * Return > 0 if a hardware breakpoint has been hit, and the
2431 * breakpoint was in user space. Return 0, otherwise.
2432 */
2433int
2434user_dbreg_trap(void)
2435{
2436 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
2437 u_int32_t bp; /* breakpoint bits extracted from dr6 */
2438 int nbp; /* number of breakpoints that triggered */
2439 caddr_t addr[4]; /* breakpoint addresses */
2440 int i;
2441
2442 dr7 = rdr7();
2443 if ((dr7 & 0x000000ff) == 0) {
2444 /*
2445 * all GE and LE bits in the dr7 register are zero,
2446 * thus the trap couldn't have been caused by the
2447 * hardware debug registers
2448 */
2449 return 0;
2450 }
2451
2452 nbp = 0;
2453 dr6 = rdr6();
2454 bp = dr6 & 0x0000000f;
2455
2456 if (!bp) {
2457 /*
2458 * None of the breakpoint bits are set meaning this
2459 * trap was not caused by any of the debug registers
2460 */
2461 return 0;
2462 }
2463
2464 /*
2465 * at least one of the breakpoints were hit, check to see
2466 * which ones and if any of them are user space addresses
2467 */
2468
2469 if (bp & 0x01) {
2470 addr[nbp++] = (caddr_t)rdr0();
2471 }
2472 if (bp & 0x02) {
2473 addr[nbp++] = (caddr_t)rdr1();
2474 }
2475 if (bp & 0x04) {
2476 addr[nbp++] = (caddr_t)rdr2();
2477 }
2478 if (bp & 0x08) {
2479 addr[nbp++] = (caddr_t)rdr3();
2480 }
2481
2482 for (i=0; i<nbp; i++) {
2483 if (addr[i] <
2484 (caddr_t)VM_MAXUSER_ADDRESS) {
2485 /*
2486 * addr[i] is in user space
2487 */
2488 return nbp;
2489 }
2490 }
2491
2492 /*
2493 * None of the breakpoints are in user space.
2494 */
2495 return 0;
2496}
2497
2498
2499#ifndef DDB
2500void
2501Debugger(const char *msg)
2502{
2503 printf("Debugger(\"%s\") called.\n", msg);
2504}
2505#endif /* no DDB */
2506
2507#include <sys/disklabel.h>
2508
2509/*
2510 * Determine the size of the transfer, and make sure it is
2511 * within the boundaries of the partition. Adjust transfer
2512 * if needed, and signal errors or early completion.
2513 */
2514int
2515bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel)
2516{
2517 struct partition *p = lp->d_partitions + dkpart(bp->b_dev);
2518 int labelsect = lp->d_partitions[0].p_offset;
2519 int maxsz = p->p_size,
2520 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
2521
2522 /* overwriting disk label ? */
2523 /* XXX should also protect bootstrap in first 8K */
2524 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
2525#if LABELSECTOR != 0
2526 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
2527#endif
2528 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2529 bp->b_error = EROFS;
2530 goto bad;
2531 }
2532
2533#if defined(DOSBBSECTOR) && defined(notyet)
2534 /* overwriting master boot record? */
2535 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR &&
2536 (bp->b_flags & B_READ) == 0 && wlabel == 0) {
2537 bp->b_error = EROFS;
2538 goto bad;
2539 }
2540#endif
2541
2542 /* beyond partition? */
2543 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
2544 /* if exactly at end of disk, return an EOF */
2545 if (bp->b_blkno == maxsz) {
2546 bp->b_resid = bp->b_bcount;
2547 return(0);
2548 }
2549 /* or truncate if part of it fits */
2550 sz = maxsz - bp->b_blkno;
2551 if (sz <= 0) {
2552 bp->b_error = EINVAL;
2553 goto bad;
2554 }
2555 bp->b_bcount = sz << DEV_BSHIFT;
2556 }
2557
2558 bp->b_pblkno = bp->b_blkno + p->p_offset;
2559 return(1);
2560
2561bad:
2562 bp->b_flags |= B_ERROR;
2563 return(-1);
2564}
2565
2566#ifdef DDB
2567
2568/*
2569 * Provide inb() and outb() as functions. They are normally only
2570 * available as macros calling inlined functions, thus cannot be
2571 * called inside DDB.
2572 *
2573 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
2574 */
2575
2576#undef inb
2577#undef outb
2578
2579/* silence compiler warnings */
2580u_char inb(u_int);
2581void outb(u_int, u_char);
2582
2583u_char
2584inb(u_int port)
2585{
2586 u_char data;
2587 /*
2588 * We use %%dx and not %1 here because i/o is done at %dx and not at
2589 * %edx, while gcc generates inferior code (movw instead of movl)
2590 * if we tell it to load (u_short) port.
2591 */
2592 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
2593 return (data);
2594}
2595
2596void
2597outb(u_int port, u_char data)
2598{
2599 u_char al;
2600 /*
2601 * Use an unnecessary assignment to help gcc's register allocator.
2602 * This make a large difference for gcc-1.40 and a tiny difference
2603 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
2604 * best results. gcc-2.6.0 can't handle this.
2605 */
2606 al = data;
2607 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
2608}
2609
2610#endif /* DDB */