FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/vm86.c
1 /*-
2 * Copyright (c) 1997 Jonathan Lemon
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/6.3/sys/i386/i386/vm86.c 173886 2007-11-24 19:45:58Z cvs2svn $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/proc.h>
33 #include <sys/lock.h>
34 #include <sys/malloc.h>
35 #include <sys/mutex.h>
36
37 #include <vm/vm.h>
38 #include <vm/pmap.h>
39 #include <vm/vm_map.h>
40 #include <vm/vm_page.h>
41
42 #include <machine/md_var.h>
43 #include <machine/pcb.h>
44 #include <machine/pcb_ext.h>
45 #include <machine/psl.h>
46 #include <machine/specialreg.h>
47 #include <machine/sysarch.h>
48
49 extern int vm86pa;
50 extern struct pcb *vm86pcb;
51
52 static struct mtx vm86_lock;
53
54 extern int vm86_bioscall(struct vm86frame *);
55 extern void vm86_biosret(struct vm86frame *);
56
57 void vm86_prepcall(struct vm86frame);
58
59 struct system_map {
60 int type;
61 vm_offset_t start;
62 vm_offset_t end;
63 };
64
65 #define HLT 0xf4
66 #define CLI 0xfa
67 #define STI 0xfb
68 #define PUSHF 0x9c
69 #define POPF 0x9d
70 #define INTn 0xcd
71 #define IRET 0xcf
72 #define CALLm 0xff
73 #define OPERAND_SIZE_PREFIX 0x66
74 #define ADDRESS_SIZE_PREFIX 0x67
75 #define PUSH_MASK ~(PSL_VM | PSL_RF | PSL_I)
76 #define POP_MASK ~(PSL_VIP | PSL_VIF | PSL_VM | PSL_RF | PSL_IOPL)
77
78 static __inline caddr_t
79 MAKE_ADDR(u_short sel, u_short off)
80 {
81 return ((caddr_t)((sel << 4) + off));
82 }
83
84 static __inline void
85 GET_VEC(u_int vec, u_short *sel, u_short *off)
86 {
87 *sel = vec >> 16;
88 *off = vec & 0xffff;
89 }
90
91 static __inline u_int
92 MAKE_VEC(u_short sel, u_short off)
93 {
94 return ((sel << 16) | off);
95 }
96
97 static __inline void
98 PUSH(u_short x, struct vm86frame *vmf)
99 {
100 vmf->vmf_sp -= 2;
101 suword16(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x);
102 }
103
104 static __inline void
105 PUSHL(u_int x, struct vm86frame *vmf)
106 {
107 vmf->vmf_sp -= 4;
108 suword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x);
109 }
110
111 static __inline u_short
112 POP(struct vm86frame *vmf)
113 {
114 u_short x = fuword16(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp));
115
116 vmf->vmf_sp += 2;
117 return (x);
118 }
119
120 static __inline u_int
121 POPL(struct vm86frame *vmf)
122 {
123 u_int x = fuword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp));
124
125 vmf->vmf_sp += 4;
126 return (x);
127 }
128
129 int
130 vm86_emulate(vmf)
131 struct vm86frame *vmf;
132 {
133 struct vm86_kernel *vm86;
134 caddr_t addr;
135 u_char i_byte;
136 u_int temp_flags;
137 int inc_ip = 1;
138 int retcode = 0;
139
140 /*
141 * pcb_ext contains the address of the extension area, or zero if
142 * the extension is not present. (This check should not be needed,
143 * as we can't enter vm86 mode until we set up an extension area)
144 */
145 if (PCPU_GET(curpcb)->pcb_ext == 0)
146 return (SIGBUS);
147 vm86 = &PCPU_GET(curpcb)->pcb_ext->ext_vm86;
148
149 if (vmf->vmf_eflags & PSL_T)
150 retcode = SIGTRAP;
151
152 addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip);
153 i_byte = fubyte(addr);
154 if (i_byte == ADDRESS_SIZE_PREFIX) {
155 i_byte = fubyte(++addr);
156 inc_ip++;
157 }
158
159 if (vm86->vm86_has_vme) {
160 switch (i_byte) {
161 case OPERAND_SIZE_PREFIX:
162 i_byte = fubyte(++addr);
163 inc_ip++;
164 switch (i_byte) {
165 case PUSHF:
166 if (vmf->vmf_eflags & PSL_VIF)
167 PUSHL((vmf->vmf_eflags & PUSH_MASK)
168 | PSL_IOPL | PSL_I, vmf);
169 else
170 PUSHL((vmf->vmf_eflags & PUSH_MASK)
171 | PSL_IOPL, vmf);
172 vmf->vmf_ip += inc_ip;
173 return (0);
174
175 case POPF:
176 temp_flags = POPL(vmf) & POP_MASK;
177 vmf->vmf_eflags = (vmf->vmf_eflags & ~POP_MASK)
178 | temp_flags | PSL_VM | PSL_I;
179 vmf->vmf_ip += inc_ip;
180 if (temp_flags & PSL_I) {
181 vmf->vmf_eflags |= PSL_VIF;
182 if (vmf->vmf_eflags & PSL_VIP)
183 break;
184 } else {
185 vmf->vmf_eflags &= ~PSL_VIF;
186 }
187 return (0);
188 }
189 break;
190
191 /* VME faults here if VIP is set, but does not set VIF. */
192 case STI:
193 vmf->vmf_eflags |= PSL_VIF;
194 vmf->vmf_ip += inc_ip;
195 if ((vmf->vmf_eflags & PSL_VIP) == 0) {
196 uprintf("fatal sti\n");
197 return (SIGKILL);
198 }
199 break;
200
201 /* VME if no redirection support */
202 case INTn:
203 break;
204
205 /* VME if trying to set PSL_TF, or PSL_I when VIP is set */
206 case POPF:
207 temp_flags = POP(vmf) & POP_MASK;
208 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
209 | temp_flags | PSL_VM | PSL_I;
210 vmf->vmf_ip += inc_ip;
211 if (temp_flags & PSL_I) {
212 vmf->vmf_eflags |= PSL_VIF;
213 if (vmf->vmf_eflags & PSL_VIP)
214 break;
215 } else {
216 vmf->vmf_eflags &= ~PSL_VIF;
217 }
218 return (retcode);
219
220 /* VME if trying to set PSL_TF, or PSL_I when VIP is set */
221 case IRET:
222 vmf->vmf_ip = POP(vmf);
223 vmf->vmf_cs = POP(vmf);
224 temp_flags = POP(vmf) & POP_MASK;
225 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
226 | temp_flags | PSL_VM | PSL_I;
227 if (temp_flags & PSL_I) {
228 vmf->vmf_eflags |= PSL_VIF;
229 if (vmf->vmf_eflags & PSL_VIP)
230 break;
231 } else {
232 vmf->vmf_eflags &= ~PSL_VIF;
233 }
234 return (retcode);
235
236 }
237 return (SIGBUS);
238 }
239
240 switch (i_byte) {
241 case OPERAND_SIZE_PREFIX:
242 i_byte = fubyte(++addr);
243 inc_ip++;
244 switch (i_byte) {
245 case PUSHF:
246 if (vm86->vm86_eflags & PSL_VIF)
247 PUSHL((vmf->vmf_flags & PUSH_MASK)
248 | PSL_IOPL | PSL_I, vmf);
249 else
250 PUSHL((vmf->vmf_flags & PUSH_MASK)
251 | PSL_IOPL, vmf);
252 vmf->vmf_ip += inc_ip;
253 return (retcode);
254
255 case POPF:
256 temp_flags = POPL(vmf) & POP_MASK;
257 vmf->vmf_eflags = (vmf->vmf_eflags & ~POP_MASK)
258 | temp_flags | PSL_VM | PSL_I;
259 vmf->vmf_ip += inc_ip;
260 if (temp_flags & PSL_I) {
261 vm86->vm86_eflags |= PSL_VIF;
262 if (vm86->vm86_eflags & PSL_VIP)
263 break;
264 } else {
265 vm86->vm86_eflags &= ~PSL_VIF;
266 }
267 return (retcode);
268 }
269 return (SIGBUS);
270
271 case CLI:
272 vm86->vm86_eflags &= ~PSL_VIF;
273 vmf->vmf_ip += inc_ip;
274 return (retcode);
275
276 case STI:
277 /* if there is a pending interrupt, go to the emulator */
278 vm86->vm86_eflags |= PSL_VIF;
279 vmf->vmf_ip += inc_ip;
280 if (vm86->vm86_eflags & PSL_VIP)
281 break;
282 return (retcode);
283
284 case PUSHF:
285 if (vm86->vm86_eflags & PSL_VIF)
286 PUSH((vmf->vmf_flags & PUSH_MASK)
287 | PSL_IOPL | PSL_I, vmf);
288 else
289 PUSH((vmf->vmf_flags & PUSH_MASK) | PSL_IOPL, vmf);
290 vmf->vmf_ip += inc_ip;
291 return (retcode);
292
293 case INTn:
294 i_byte = fubyte(addr + 1);
295 if ((vm86->vm86_intmap[i_byte >> 3] & (1 << (i_byte & 7))) != 0)
296 break;
297 if (vm86->vm86_eflags & PSL_VIF)
298 PUSH((vmf->vmf_flags & PUSH_MASK)
299 | PSL_IOPL | PSL_I, vmf);
300 else
301 PUSH((vmf->vmf_flags & PUSH_MASK) | PSL_IOPL, vmf);
302 PUSH(vmf->vmf_cs, vmf);
303 PUSH(vmf->vmf_ip + inc_ip + 1, vmf); /* increment IP */
304 GET_VEC(fuword((caddr_t)(i_byte * 4)),
305 &vmf->vmf_cs, &vmf->vmf_ip);
306 vmf->vmf_flags &= ~PSL_T;
307 vm86->vm86_eflags &= ~PSL_VIF;
308 return (retcode);
309
310 case IRET:
311 vmf->vmf_ip = POP(vmf);
312 vmf->vmf_cs = POP(vmf);
313 temp_flags = POP(vmf) & POP_MASK;
314 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
315 | temp_flags | PSL_VM | PSL_I;
316 if (temp_flags & PSL_I) {
317 vm86->vm86_eflags |= PSL_VIF;
318 if (vm86->vm86_eflags & PSL_VIP)
319 break;
320 } else {
321 vm86->vm86_eflags &= ~PSL_VIF;
322 }
323 return (retcode);
324
325 case POPF:
326 temp_flags = POP(vmf) & POP_MASK;
327 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
328 | temp_flags | PSL_VM | PSL_I;
329 vmf->vmf_ip += inc_ip;
330 if (temp_flags & PSL_I) {
331 vm86->vm86_eflags |= PSL_VIF;
332 if (vm86->vm86_eflags & PSL_VIP)
333 break;
334 } else {
335 vm86->vm86_eflags &= ~PSL_VIF;
336 }
337 return (retcode);
338 }
339 return (SIGBUS);
340 }
341
342 #define PGTABLE_SIZE ((1024 + 64) * 1024 / PAGE_SIZE)
343 #define INTMAP_SIZE 32
344 #define IOMAP_SIZE ctob(IOPAGES)
345 #define TSS_SIZE \
346 (sizeof(struct pcb_ext) - sizeof(struct segment_descriptor) + \
347 INTMAP_SIZE + IOMAP_SIZE + 1)
348
349 struct vm86_layout {
350 pt_entry_t vml_pgtbl[PGTABLE_SIZE];
351 struct pcb vml_pcb;
352 struct pcb_ext vml_ext;
353 char vml_intmap[INTMAP_SIZE];
354 char vml_iomap[IOMAP_SIZE];
355 char vml_iomap_trailer;
356 };
357
358 void
359 vm86_initialize(void)
360 {
361 int i;
362 u_int *addr;
363 struct vm86_layout *vml = (struct vm86_layout *)vm86paddr;
364 struct pcb *pcb;
365 struct pcb_ext *ext;
366 struct soft_segment_descriptor ssd = {
367 0, /* segment base address (overwritten) */
368 0, /* length (overwritten) */
369 SDT_SYS386TSS, /* segment type */
370 0, /* priority level */
371 1, /* descriptor present */
372 0, 0,
373 0, /* default 16 size */
374 0 /* granularity */
375 };
376
377 /*
378 * this should be a compile time error, but cpp doesn't grok sizeof().
379 */
380 if (sizeof(struct vm86_layout) > ctob(3))
381 panic("struct vm86_layout exceeds space allocated in locore.s");
382
383 /*
384 * Below is the memory layout that we use for the vm86 region.
385 *
386 * +--------+
387 * | |
388 * | |
389 * | page 0 |
390 * | | +--------+
391 * | | | stack |
392 * +--------+ +--------+ <--------- vm86paddr
393 * | | |Page Tbl| 1M + 64K = 272 entries = 1088 bytes
394 * | | +--------+
395 * | | | PCB | size: ~240 bytes
396 * | page 1 | |PCB Ext | size: ~140 bytes (includes TSS)
397 * | | +--------+
398 * | | |int map |
399 * | | +--------+
400 * +--------+ | |
401 * | page 2 | | I/O |
402 * +--------+ | bitmap |
403 * | page 3 | | |
404 * | | +--------+
405 * +--------+
406 */
407
408 /*
409 * A rudimentary PCB must be installed, in order to get to the
410 * PCB extension area. We use the PCB area as a scratchpad for
411 * data storage, the layout of which is shown below.
412 *
413 * pcb_esi = new PTD entry 0
414 * pcb_ebp = pointer to frame on vm86 stack
415 * pcb_esp = stack frame pointer at time of switch
416 * pcb_ebx = va of vm86 page table
417 * pcb_eip = argument pointer to initial call
418 * pcb_spare[0] = saved TSS descriptor, word 0
419 * pcb_space[1] = saved TSS descriptor, word 1
420 */
421 #define new_ptd pcb_esi
422 #define vm86_frame pcb_ebp
423 #define pgtable_va pcb_ebx
424
425 pcb = &vml->vml_pcb;
426 ext = &vml->vml_ext;
427
428 mtx_init(&vm86_lock, "vm86 lock", NULL, MTX_DEF);
429
430 bzero(pcb, sizeof(struct pcb));
431 pcb->new_ptd = vm86pa | PG_V | PG_RW | PG_U;
432 pcb->vm86_frame = vm86paddr - sizeof(struct vm86frame);
433 pcb->pgtable_va = vm86paddr;
434 pcb->pcb_flags = PCB_VM86CALL;
435 pcb->pcb_ext = ext;
436
437 bzero(ext, sizeof(struct pcb_ext));
438 ext->ext_tss.tss_esp0 = vm86paddr;
439 ext->ext_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
440 ext->ext_tss.tss_ioopt =
441 ((u_int)vml->vml_iomap - (u_int)&ext->ext_tss) << 16;
442 ext->ext_iomap = vml->vml_iomap;
443 ext->ext_vm86.vm86_intmap = vml->vml_intmap;
444
445 if (cpu_feature & CPUID_VME)
446 ext->ext_vm86.vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
447
448 addr = (u_int *)ext->ext_vm86.vm86_intmap;
449 for (i = 0; i < (INTMAP_SIZE + IOMAP_SIZE) / sizeof(u_int); i++)
450 *addr++ = 0;
451 vml->vml_iomap_trailer = 0xff;
452
453 ssd.ssd_base = (u_int)&ext->ext_tss;
454 ssd.ssd_limit = TSS_SIZE - 1;
455 ssdtosd(&ssd, &ext->ext_tssd);
456
457 vm86pcb = pcb;
458
459 #if 0
460 /*
461 * use whatever is leftover of the vm86 page layout as a
462 * message buffer so we can capture early output.
463 */
464 msgbufinit((vm_offset_t)vm86paddr + sizeof(struct vm86_layout),
465 ctob(3) - sizeof(struct vm86_layout));
466 #endif
467 }
468
469 vm_offset_t
470 vm86_getpage(struct vm86context *vmc, int pagenum)
471 {
472 int i;
473
474 for (i = 0; i < vmc->npages; i++)
475 if (vmc->pmap[i].pte_num == pagenum)
476 return (vmc->pmap[i].kva);
477 return (0);
478 }
479
480 vm_offset_t
481 vm86_addpage(struct vm86context *vmc, int pagenum, vm_offset_t kva)
482 {
483 int i, flags = 0;
484
485 for (i = 0; i < vmc->npages; i++)
486 if (vmc->pmap[i].pte_num == pagenum)
487 goto overlap;
488
489 if (vmc->npages == VM86_PMAPSIZE)
490 goto full; /* XXX grow map? */
491
492 if (kva == 0) {
493 kva = (vm_offset_t)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
494 flags = VMAP_MALLOC;
495 }
496
497 i = vmc->npages++;
498 vmc->pmap[i].flags = flags;
499 vmc->pmap[i].kva = kva;
500 vmc->pmap[i].pte_num = pagenum;
501 return (kva);
502 overlap:
503 panic("vm86_addpage: overlap");
504 full:
505 panic("vm86_addpage: not enough room");
506 }
507
508 static void
509 vm86_initflags(struct vm86frame *vmf)
510 {
511 int eflags = vmf->vmf_eflags;
512 struct vm86_kernel *vm86 = &PCPU_GET(curpcb)->pcb_ext->ext_vm86;
513
514 if (vm86->vm86_has_vme) {
515 eflags = (vmf->vmf_eflags & ~VME_USERCHANGE) |
516 (eflags & VME_USERCHANGE) | PSL_VM;
517 } else {
518 vm86->vm86_eflags = eflags; /* save VIF, VIP */
519 eflags = (vmf->vmf_eflags & ~VM_USERCHANGE) |
520 (eflags & VM_USERCHANGE) | PSL_VM;
521 }
522 vmf->vmf_eflags = eflags | PSL_VM;
523 }
524
525 /*
526 * called from vm86_bioscall, while in vm86 address space, to finalize setup.
527 */
528 void
529 vm86_prepcall(struct vm86frame vmf)
530 {
531 uintptr_t addr[] = { 0xA00, 0x1000 }; /* code, stack */
532 u_char intcall[] = {
533 CLI, INTn, 0x00, STI, HLT
534 };
535
536 if ((vmf.vmf_trapno & PAGE_MASK) <= 0xff) {
537 /* interrupt call requested */
538 intcall[2] = (u_char)(vmf.vmf_trapno & 0xff);
539 memcpy((void *)addr[0], (void *)intcall, sizeof(intcall));
540 vmf.vmf_ip = addr[0];
541 vmf.vmf_cs = 0;
542 }
543 vmf.vmf_sp = addr[1] - 2; /* keep aligned */
544 vmf.kernel_fs = vmf.kernel_es = vmf.kernel_ds = 0;
545 vmf.vmf_ss = 0;
546 vmf.vmf_eflags = PSL_VIF | PSL_VM | PSL_USER;
547 vm86_initflags(&vmf);
548 }
549
550 /*
551 * vm86 trap handler; determines whether routine succeeded or not.
552 * Called while in vm86 space, returns to calling process.
553 */
554 void
555 vm86_trap(struct vm86frame *vmf)
556 {
557 caddr_t addr;
558
559 /* "should not happen" */
560 if ((vmf->vmf_eflags & PSL_VM) == 0)
561 panic("vm86_trap called, but not in vm86 mode");
562
563 addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip);
564 if (*(u_char *)addr == HLT)
565 vmf->vmf_trapno = vmf->vmf_eflags & PSL_C;
566 else
567 vmf->vmf_trapno = vmf->vmf_trapno << 16;
568
569 vm86_biosret(vmf);
570 }
571
572 int
573 vm86_intcall(int intnum, struct vm86frame *vmf)
574 {
575 int retval;
576
577 if (intnum < 0 || intnum > 0xff)
578 return (EINVAL);
579
580 vmf->vmf_trapno = intnum;
581 mtx_lock(&vm86_lock);
582 critical_enter();
583 retval = vm86_bioscall(vmf);
584 critical_exit();
585 mtx_unlock(&vm86_lock);
586 return (retval);
587 }
588
589 /*
590 * struct vm86context contains the page table to use when making
591 * vm86 calls. If intnum is a valid interrupt number (0-255), then
592 * the "interrupt trampoline" will be used, otherwise we use the
593 * caller's cs:ip routine.
594 */
595 int
596 vm86_datacall(intnum, vmf, vmc)
597 int intnum;
598 struct vm86frame *vmf;
599 struct vm86context *vmc;
600 {
601 pt_entry_t *pte = (pt_entry_t *)vm86paddr;
602 vm_paddr_t page;
603 int i, entry, retval;
604
605 mtx_lock(&vm86_lock);
606 for (i = 0; i < vmc->npages; i++) {
607 page = vtophys(vmc->pmap[i].kva & PG_FRAME);
608 entry = vmc->pmap[i].pte_num;
609 vmc->pmap[i].old_pte = pte[entry];
610 pte[entry] = page | PG_V | PG_RW | PG_U;
611 pmap_invalidate_page(kernel_pmap, vmc->pmap[i].kva);
612 }
613
614 vmf->vmf_trapno = intnum;
615 critical_enter();
616 retval = vm86_bioscall(vmf);
617 critical_exit();
618
619 for (i = 0; i < vmc->npages; i++) {
620 entry = vmc->pmap[i].pte_num;
621 pte[entry] = vmc->pmap[i].old_pte;
622 pmap_invalidate_page(kernel_pmap, vmc->pmap[i].kva);
623 }
624 mtx_unlock(&vm86_lock);
625
626 return (retval);
627 }
628
629 vm_offset_t
630 vm86_getaddr(vmc, sel, off)
631 struct vm86context *vmc;
632 u_short sel;
633 u_short off;
634 {
635 int i, page;
636 vm_offset_t addr;
637
638 addr = (vm_offset_t)MAKE_ADDR(sel, off);
639 page = addr >> PAGE_SHIFT;
640 for (i = 0; i < vmc->npages; i++)
641 if (page == vmc->pmap[i].pte_num)
642 return (vmc->pmap[i].kva + (addr & PAGE_MASK));
643 return (0);
644 }
645
646 int
647 vm86_getptr(vmc, kva, sel, off)
648 struct vm86context *vmc;
649 vm_offset_t kva;
650 u_short *sel;
651 u_short *off;
652 {
653 int i;
654
655 for (i = 0; i < vmc->npages; i++)
656 if (kva >= vmc->pmap[i].kva &&
657 kva < vmc->pmap[i].kva + PAGE_SIZE) {
658 *off = kva - vmc->pmap[i].kva;
659 *sel = vmc->pmap[i].pte_num << 8;
660 return (1);
661 }
662 return (0);
663 panic("vm86_getptr: address not found");
664 }
665
666 int
667 vm86_sysarch(td, args)
668 struct thread *td;
669 char *args;
670 {
671 int error = 0;
672 struct i386_vm86_args ua;
673 struct vm86_kernel *vm86;
674
675 if ((error = copyin(args, &ua, sizeof(struct i386_vm86_args))) != 0)
676 return (error);
677
678 if (td->td_pcb->pcb_ext == 0)
679 if ((error = i386_extend_pcb(td)) != 0)
680 return (error);
681 vm86 = &td->td_pcb->pcb_ext->ext_vm86;
682
683 switch (ua.sub_op) {
684 case VM86_INIT: {
685 struct vm86_init_args sa;
686
687 if ((error = copyin(ua.sub_args, &sa, sizeof(sa))) != 0)
688 return (error);
689 if (cpu_feature & CPUID_VME)
690 vm86->vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
691 else
692 vm86->vm86_has_vme = 0;
693 vm86->vm86_inited = 1;
694 vm86->vm86_debug = sa.debug;
695 bcopy(&sa.int_map, vm86->vm86_intmap, 32);
696 }
697 break;
698
699 #if 0
700 case VM86_SET_VME: {
701 struct vm86_vme_args sa;
702
703 if ((cpu_feature & CPUID_VME) == 0)
704 return (ENODEV);
705
706 if (error = copyin(ua.sub_args, &sa, sizeof(sa)))
707 return (error);
708 if (sa.state)
709 load_cr4(rcr4() | CR4_VME);
710 else
711 load_cr4(rcr4() & ~CR4_VME);
712 }
713 break;
714 #endif
715
716 case VM86_GET_VME: {
717 struct vm86_vme_args sa;
718
719 sa.state = (rcr4() & CR4_VME ? 1 : 0);
720 error = copyout(&sa, ua.sub_args, sizeof(sa));
721 }
722 break;
723
724 case VM86_INTCALL: {
725 struct vm86_intcall_args sa;
726
727 if ((error = suser(td)))
728 return (error);
729 if ((error = copyin(ua.sub_args, &sa, sizeof(sa))))
730 return (error);
731 if ((error = vm86_intcall(sa.intnum, &sa.vmf)))
732 return (error);
733 error = copyout(&sa, ua.sub_args, sizeof(sa));
734 }
735 break;
736
737 default:
738 error = EINVAL;
739 }
740 return (error);
741 }
Cache object: ab946e117e9ad5243737bf853b734097
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