MP Implementation 1/2: Get the APIC code working again, sweetly integrate the
[dragonfly.git] / sys / i386 / i386 / vm86.c
CommitLineData
984263bc
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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 * $FreeBSD: src/sys/i386/i386/vm86.c,v 1.31.2.2 2001/10/05 06:18:55 peter Exp $
8a8d5d85 27 * $DragonFly: src/sys/i386/i386/Attic/vm86.c,v 1.6 2003/07/06 21:23:48 dillon Exp $
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28 */
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
36#include <vm/vm.h>
37#include <vm/pmap.h>
38#include <vm/vm_map.h>
39#include <vm/vm_page.h>
40
41#include <sys/user.h>
42
43#include <machine/md_var.h>
44#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
45#include <machine/psl.h>
46#include <machine/specialreg.h>
47#include <machine/sysarch.h>
48
49extern int i386_extend_pcb __P((struct proc *));
50extern int vm86pa;
51extern struct pcb *vm86pcb;
52
53extern int vm86_bioscall(struct vm86frame *);
54extern void vm86_biosret(struct vm86frame *);
55
56void vm86_prepcall(struct vm86frame);
57
58struct system_map {
59 int type;
60 vm_offset_t start;
61 vm_offset_t end;
62};
63
64#define HLT 0xf4
65#define CLI 0xfa
66#define STI 0xfb
67#define PUSHF 0x9c
68#define POPF 0x9d
69#define INTn 0xcd
70#define IRET 0xcf
71#define CALLm 0xff
72#define OPERAND_SIZE_PREFIX 0x66
73#define ADDRESS_SIZE_PREFIX 0x67
74#define PUSH_MASK ~(PSL_VM | PSL_RF | PSL_I)
75#define POP_MASK ~(PSL_VIP | PSL_VIF | PSL_VM | PSL_RF | PSL_IOPL)
76
77static __inline caddr_t
78MAKE_ADDR(u_short sel, u_short off)
79{
80 return ((caddr_t)((sel << 4) + off));
81}
82
83static __inline void
84GET_VEC(u_int vec, u_short *sel, u_short *off)
85{
86 *sel = vec >> 16;
87 *off = vec & 0xffff;
88}
89
90static __inline u_int
91MAKE_VEC(u_short sel, u_short off)
92{
93 return ((sel << 16) | off);
94}
95
96static __inline void
97PUSH(u_short x, struct vm86frame *vmf)
98{
99 vmf->vmf_sp -= 2;
100 susword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x);
101}
102
103static __inline void
104PUSHL(u_int x, struct vm86frame *vmf)
105{
106 vmf->vmf_sp -= 4;
107 suword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x);
108}
109
110static __inline u_short
111POP(struct vm86frame *vmf)
112{
113 u_short x = fusword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp));
114
115 vmf->vmf_sp += 2;
116 return (x);
117}
118
119static __inline u_int
120POPL(struct vm86frame *vmf)
121{
122 u_int x = fuword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp));
123
124 vmf->vmf_sp += 4;
125 return (x);
126}
127
128int
129vm86_emulate(vmf)
130 struct vm86frame *vmf;
131{
132 struct vm86_kernel *vm86;
133 caddr_t addr;
134 u_char i_byte;
135 u_int temp_flags;
136 int inc_ip = 1;
137 int retcode = 0;
138
139 /*
140 * pcb_ext contains the address of the extension area, or zero if
141 * the extension is not present. (This check should not be needed,
142 * as we can't enter vm86 mode until we set up an extension area)
143 */
b7c628e4 144 if (curthread->td_pcb->pcb_ext == 0)
984263bc 145 return (SIGBUS);
b7c628e4 146 vm86 = &curthread->td_pcb->pcb_ext->ext_vm86;
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147
148 if (vmf->vmf_eflags & PSL_T)
149 retcode = SIGTRAP;
150
151 addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip);
152 i_byte = fubyte(addr);
153 if (i_byte == ADDRESS_SIZE_PREFIX) {
154 i_byte = fubyte(++addr);
155 inc_ip++;
156 }
157
158 if (vm86->vm86_has_vme) {
159 switch (i_byte) {
160 case OPERAND_SIZE_PREFIX:
161 i_byte = fubyte(++addr);
162 inc_ip++;
163 switch (i_byte) {
164 case PUSHF:
165 if (vmf->vmf_eflags & PSL_VIF)
166 PUSHL((vmf->vmf_eflags & PUSH_MASK)
167 | PSL_IOPL | PSL_I, vmf);
168 else
169 PUSHL((vmf->vmf_eflags & PUSH_MASK)
170 | PSL_IOPL, vmf);
171 vmf->vmf_ip += inc_ip;
172 return (0);
173
174 case POPF:
175 temp_flags = POPL(vmf) & POP_MASK;
176 vmf->vmf_eflags = (vmf->vmf_eflags & ~POP_MASK)
177 | temp_flags | PSL_VM | PSL_I;
178 vmf->vmf_ip += inc_ip;
179 if (temp_flags & PSL_I) {
180 vmf->vmf_eflags |= PSL_VIF;
181 if (vmf->vmf_eflags & PSL_VIP)
182 break;
183 } else {
184 vmf->vmf_eflags &= ~PSL_VIF;
185 }
186 return (0);
187 }
188 break;
189
190 /* VME faults here if VIP is set, but does not set VIF. */
191 case STI:
192 vmf->vmf_eflags |= PSL_VIF;
193 vmf->vmf_ip += inc_ip;
194 if ((vmf->vmf_eflags & PSL_VIP) == 0) {
195 uprintf("fatal sti\n");
196 return (SIGKILL);
197 }
198 break;
199
200 /* VME if no redirection support */
201 case INTn:
202 break;
203
204 /* VME if trying to set PSL_TF, or PSL_I when VIP is set */
205 case POPF:
206 temp_flags = POP(vmf) & POP_MASK;
207 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
208 | temp_flags | PSL_VM | PSL_I;
209 vmf->vmf_ip += inc_ip;
210 if (temp_flags & PSL_I) {
211 vmf->vmf_eflags |= PSL_VIF;
212 if (vmf->vmf_eflags & PSL_VIP)
213 break;
214 } else {
215 vmf->vmf_eflags &= ~PSL_VIF;
216 }
217 return (retcode);
218
219 /* VME if trying to set PSL_TF, or PSL_I when VIP is set */
220 case IRET:
221 vmf->vmf_ip = POP(vmf);
222 vmf->vmf_cs = POP(vmf);
223 temp_flags = POP(vmf) & POP_MASK;
224 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
225 | temp_flags | PSL_VM | PSL_I;
226 if (temp_flags & PSL_I) {
227 vmf->vmf_eflags |= PSL_VIF;
228 if (vmf->vmf_eflags & PSL_VIP)
229 break;
230 } else {
231 vmf->vmf_eflags &= ~PSL_VIF;
232 }
233 return (retcode);
234
235 }
236 return (SIGBUS);
237 }
238
239 switch (i_byte) {
240 case OPERAND_SIZE_PREFIX:
241 i_byte = fubyte(++addr);
242 inc_ip++;
243 switch (i_byte) {
244 case PUSHF:
245 if (vm86->vm86_eflags & PSL_VIF)
246 PUSHL((vmf->vmf_flags & PUSH_MASK)
247 | PSL_IOPL | PSL_I, vmf);
248 else
249 PUSHL((vmf->vmf_flags & PUSH_MASK)
250 | PSL_IOPL, vmf);
251 vmf->vmf_ip += inc_ip;
252 return (retcode);
253
254 case POPF:
255 temp_flags = POPL(vmf) & POP_MASK;
256 vmf->vmf_eflags = (vmf->vmf_eflags & ~POP_MASK)
257 | temp_flags | PSL_VM | PSL_I;
258 vmf->vmf_ip += inc_ip;
259 if (temp_flags & PSL_I) {
260 vm86->vm86_eflags |= PSL_VIF;
261 if (vm86->vm86_eflags & PSL_VIP)
262 break;
263 } else {
264 vm86->vm86_eflags &= ~PSL_VIF;
265 }
266 return (retcode);
267 }
268 return (SIGBUS);
269
270 case CLI:
271 vm86->vm86_eflags &= ~PSL_VIF;
272 vmf->vmf_ip += inc_ip;
273 return (retcode);
274
275 case STI:
276 /* if there is a pending interrupt, go to the emulator */
277 vm86->vm86_eflags |= PSL_VIF;
278 vmf->vmf_ip += inc_ip;
279 if (vm86->vm86_eflags & PSL_VIP)
280 break;
281 return (retcode);
282
283 case PUSHF:
284 if (vm86->vm86_eflags & PSL_VIF)
285 PUSH((vmf->vmf_flags & PUSH_MASK)
286 | PSL_IOPL | PSL_I, vmf);
287 else
288 PUSH((vmf->vmf_flags & PUSH_MASK) | PSL_IOPL, vmf);
289 vmf->vmf_ip += inc_ip;
290 return (retcode);
291
292 case INTn:
293 i_byte = fubyte(addr + 1);
294 if ((vm86->vm86_intmap[i_byte >> 3] & (1 << (i_byte & 7))) != 0)
295 break;
296 if (vm86->vm86_eflags & PSL_VIF)
297 PUSH((vmf->vmf_flags & PUSH_MASK)
298 | PSL_IOPL | PSL_I, vmf);
299 else
300 PUSH((vmf->vmf_flags & PUSH_MASK) | PSL_IOPL, vmf);
301 PUSH(vmf->vmf_cs, vmf);
302 PUSH(vmf->vmf_ip + inc_ip + 1, vmf); /* increment IP */
303 GET_VEC(fuword((caddr_t)(i_byte * 4)),
304 &vmf->vmf_cs, &vmf->vmf_ip);
305 vmf->vmf_flags &= ~PSL_T;
306 vm86->vm86_eflags &= ~PSL_VIF;
307 return (retcode);
308
309 case IRET:
310 vmf->vmf_ip = POP(vmf);
311 vmf->vmf_cs = POP(vmf);
312 temp_flags = POP(vmf) & POP_MASK;
313 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
314 | temp_flags | PSL_VM | PSL_I;
315 if (temp_flags & PSL_I) {
316 vm86->vm86_eflags |= PSL_VIF;
317 if (vm86->vm86_eflags & PSL_VIP)
318 break;
319 } else {
320 vm86->vm86_eflags &= ~PSL_VIF;
321 }
322 return (retcode);
323
324 case POPF:
325 temp_flags = POP(vmf) & POP_MASK;
326 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
327 | temp_flags | PSL_VM | PSL_I;
328 vmf->vmf_ip += inc_ip;
329 if (temp_flags & PSL_I) {
330 vm86->vm86_eflags |= PSL_VIF;
331 if (vm86->vm86_eflags & PSL_VIP)
332 break;
333 } else {
334 vm86->vm86_eflags &= ~PSL_VIF;
335 }
336 return (retcode);
337 }
338 return (SIGBUS);
339}
340
341#define PGTABLE_SIZE ((1024 + 64) * 1024 / PAGE_SIZE)
342#define INTMAP_SIZE 32
343#define IOMAP_SIZE ctob(IOPAGES)
344#define TSS_SIZE \
345 (sizeof(struct pcb_ext) - sizeof(struct segment_descriptor) + \
346 INTMAP_SIZE + IOMAP_SIZE + 1)
347
348struct vm86_layout {
349 pt_entry_t vml_pgtbl[PGTABLE_SIZE];
350 struct pcb vml_pcb;
351 struct pcb_ext vml_ext;
352 char vml_intmap[INTMAP_SIZE];
353 char vml_iomap[IOMAP_SIZE];
354 char vml_iomap_trailer;
355};
356
357void
358vm86_initialize(void)
359{
360 int i;
361 u_int *addr;
362 struct vm86_layout *vml = (struct vm86_layout *)vm86paddr;
363 struct pcb *pcb;
364 struct pcb_ext *ext;
365 struct soft_segment_descriptor ssd = {
366 0, /* segment base address (overwritten) */
367 0, /* length (overwritten) */
368 SDT_SYS386TSS, /* segment type */
369 0, /* priority level */
370 1, /* descriptor present */
371 0, 0,
372 0, /* default 16 size */
373 0 /* granularity */
374 };
375
376 /*
377 * this should be a compile time error, but cpp doesn't grok sizeof().
378 */
379 if (sizeof(struct vm86_layout) > ctob(3))
380 panic("struct vm86_layout exceeds space allocated in locore.s");
381
382 /*
383 * Below is the memory layout that we use for the vm86 region.
384 *
385 * +--------+
386 * | |
387 * | |
388 * | page 0 |
389 * | | +--------+
390 * | | | stack |
391 * +--------+ +--------+ <--------- vm86paddr
392 * | | |Page Tbl| 1M + 64K = 272 entries = 1088 bytes
393 * | | +--------+
394 * | | | PCB | size: ~240 bytes
395 * | page 1 | |PCB Ext | size: ~140 bytes (includes TSS)
396 * | | +--------+
397 * | | |int map |
398 * | | +--------+
399 * +--------+ | |
400 * | page 2 | | I/O |
401 * +--------+ | bitmap |
402 * | page 3 | | |
403 * | | +--------+
404 * +--------+
405 */
406
407 /*
408 * A rudimentary PCB must be installed, in order to get to the
409 * PCB extension area. We use the PCB area as a scratchpad for
410 * data storage, the layout of which is shown below.
411 *
412 * pcb_esi = new PTD entry 0
413 * pcb_ebp = pointer to frame on vm86 stack
414 * pcb_esp = stack frame pointer at time of switch
415 * pcb_ebx = va of vm86 page table
416 * pcb_eip = argument pointer to initial call
417 * pcb_spare[0] = saved TSS descriptor, word 0
418 * pcb_space[1] = saved TSS descriptor, word 1
419 */
420#define new_ptd pcb_esi
421#define vm86_frame pcb_ebp
422#define pgtable_va pcb_ebx
423
424 pcb = &vml->vml_pcb;
425 ext = &vml->vml_ext;
426
427 bzero(pcb, sizeof(struct pcb));
428 pcb->new_ptd = vm86pa | PG_V | PG_RW | PG_U;
429 pcb->vm86_frame = vm86paddr - sizeof(struct vm86frame);
430 pcb->pgtable_va = vm86paddr;
431 pcb->pcb_ext = ext;
432
433 bzero(ext, sizeof(struct pcb_ext));
434 ext->ext_tss.tss_esp0 = vm86paddr;
435 ext->ext_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
436 ext->ext_tss.tss_ioopt =
437 ((u_int)vml->vml_iomap - (u_int)&ext->ext_tss) << 16;
438 ext->ext_iomap = vml->vml_iomap;
439 ext->ext_vm86.vm86_intmap = vml->vml_intmap;
440
441 if (cpu_feature & CPUID_VME)
442 ext->ext_vm86.vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
443
444 addr = (u_int *)ext->ext_vm86.vm86_intmap;
445 for (i = 0; i < (INTMAP_SIZE + IOMAP_SIZE) / sizeof(u_int); i++)
446 *addr++ = 0;
447 vml->vml_iomap_trailer = 0xff;
448
449 ssd.ssd_base = (u_int)&ext->ext_tss;
450 ssd.ssd_limit = TSS_SIZE - 1;
451 ssdtosd(&ssd, &ext->ext_tssd);
452
453 vm86pcb = pcb;
454
455#if 0
456 /*
457 * use whatever is leftover of the vm86 page layout as a
458 * message buffer so we can capture early output.
459 */
460 msgbufinit((vm_offset_t)vm86paddr + sizeof(struct vm86_layout),
461 ctob(3) - sizeof(struct vm86_layout));
462#endif
463}
464
465vm_offset_t
466vm86_getpage(struct vm86context *vmc, int pagenum)
467{
468 int i;
469
470 for (i = 0; i < vmc->npages; i++)
471 if (vmc->pmap[i].pte_num == pagenum)
472 return (vmc->pmap[i].kva);
473 return (0);
474}
475
476vm_offset_t
477vm86_addpage(struct vm86context *vmc, int pagenum, vm_offset_t kva)
478{
479 int i, flags = 0;
480
481 for (i = 0; i < vmc->npages; i++)
482 if (vmc->pmap[i].pte_num == pagenum)
483 goto bad;
484
485 if (vmc->npages == VM86_PMAPSIZE)
486 goto bad; /* XXX grow map? */
487
488 if (kva == 0) {
489 kva = (vm_offset_t)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
490 flags = VMAP_MALLOC;
491 }
492
493 i = vmc->npages++;
494 vmc->pmap[i].flags = flags;
495 vmc->pmap[i].kva = kva;
496 vmc->pmap[i].pte_num = pagenum;
497 return (kva);
498bad:
499 panic("vm86_addpage: not enough room, or overlap");
500}
501
502static void
503vm86_initflags(struct vm86frame *vmf)
504{
505 int eflags = vmf->vmf_eflags;
b7c628e4 506 struct vm86_kernel *vm86 = &curthread->td_pcb->pcb_ext->ext_vm86;
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507
508 if (vm86->vm86_has_vme) {
509 eflags = (vmf->vmf_eflags & ~VME_USERCHANGE) |
510 (eflags & VME_USERCHANGE) | PSL_VM;
511 } else {
512 vm86->vm86_eflags = eflags; /* save VIF, VIP */
513 eflags = (vmf->vmf_eflags & ~VM_USERCHANGE) |
514 (eflags & VM_USERCHANGE) | PSL_VM;
515 }
516 vmf->vmf_eflags = eflags | PSL_VM;
517}
518
519/*
520 * called from vm86_bioscall, while in vm86 address space, to finalize setup.
521 */
522void
523vm86_prepcall(struct vm86frame vmf)
524{
525 uintptr_t addr[] = { 0xA00, 0x1000 }; /* code, stack */
526 u_char intcall[] = {
527 CLI, INTn, 0x00, STI, HLT
528 };
529
530 if ((vmf.vmf_trapno & PAGE_MASK) <= 0xff) {
531 /* interrupt call requested */
532 intcall[2] = (u_char)(vmf.vmf_trapno & 0xff);
533 memcpy((void *)addr[0], (void *)intcall, sizeof(intcall));
534 vmf.vmf_ip = addr[0];
535 vmf.vmf_cs = 0;
536 }
537 vmf.vmf_sp = addr[1] - 2; /* keep aligned */
538 vmf.kernel_fs = vmf.kernel_es = vmf.kernel_ds = 0;
539 vmf.vmf_ss = 0;
540 vmf.vmf_eflags = PSL_VIF | PSL_VM | PSL_USER;
541 vm86_initflags(&vmf);
542}
543
544/*
545 * vm86 trap handler; determines whether routine succeeded or not.
546 * Called while in vm86 space, returns to calling process.
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547 *
548 * A MP lock ref is held on entry from trap() and must be released prior
549 * to returning to the VM86 call.
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550 */
551void
552vm86_trap(struct vm86frame *vmf)
553{
554 caddr_t addr;
555
556 /* "should not happen" */
557 if ((vmf->vmf_eflags & PSL_VM) == 0)
558 panic("vm86_trap called, but not in vm86 mode");
559
560 addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip);
561 if (*(u_char *)addr == HLT)
562 vmf->vmf_trapno = vmf->vmf_eflags & PSL_C;
563 else
564 vmf->vmf_trapno = vmf->vmf_trapno << 16;
565
8a8d5d85 566 rel_mplock();
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567 vm86_biosret(vmf);
568}
569
570int
571vm86_intcall(int intnum, struct vm86frame *vmf)
572{
573 if (intnum < 0 || intnum > 0xff)
574 return (EINVAL);
575
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576 ASSERT_MP_LOCK_HELD();
577
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578 vmf->vmf_trapno = intnum;
579 return (vm86_bioscall(vmf));
580}
581
582/*
583 * struct vm86context contains the page table to use when making
584 * vm86 calls. If intnum is a valid interrupt number (0-255), then
585 * the "interrupt trampoline" will be used, otherwise we use the
586 * caller's cs:ip routine.
587 */
588int
589vm86_datacall(intnum, vmf, vmc)
590 int intnum;
591 struct vm86frame *vmf;
592 struct vm86context *vmc;
593{
594 pt_entry_t pte = (pt_entry_t)vm86paddr;
595 u_int page;
596 int i, entry, retval;
597
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598 ASSERT_MP_LOCK_HELD();
599
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600 for (i = 0; i < vmc->npages; i++) {
601 page = vtophys(vmc->pmap[i].kva & PG_FRAME);
602 entry = vmc->pmap[i].pte_num;
603 vmc->pmap[i].old_pte = pte[entry];
604 pte[entry] = page | PG_V | PG_RW | PG_U;
605 }
606
607 vmf->vmf_trapno = intnum;
608 retval = vm86_bioscall(vmf);
609
610 for (i = 0; i < vmc->npages; i++) {
611 entry = vmc->pmap[i].pte_num;
612 pte[entry] = vmc->pmap[i].old_pte;
613 }
614
615 return (retval);
616}
617
618vm_offset_t
619vm86_getaddr(vmc, sel, off)
620 struct vm86context *vmc;
621 u_short sel;
622 u_short off;
623{
624 int i, page;
625 vm_offset_t addr;
626
627 addr = (vm_offset_t)MAKE_ADDR(sel, off);
628 page = addr >> PAGE_SHIFT;
629 for (i = 0; i < vmc->npages; i++)
630 if (page == vmc->pmap[i].pte_num)
631 return (vmc->pmap[i].kva + (addr & PAGE_MASK));
632 return (0);
633}
634
635int
636vm86_getptr(vmc, kva, sel, off)
637 struct vm86context *vmc;
638 vm_offset_t kva;
639 u_short *sel;
640 u_short *off;
641{
642 int i;
643
644 for (i = 0; i < vmc->npages; i++)
645 if (kva >= vmc->pmap[i].kva &&
646 kva < vmc->pmap[i].kva + PAGE_SIZE) {
647 *off = kva - vmc->pmap[i].kva;
648 *sel = vmc->pmap[i].pte_num << 8;
649 return (1);
650 }
651 return (0);
652 panic("vm86_getptr: address not found");
653}
654
655int
dadab5e9 656vm86_sysarch(struct proc *p, char *args)
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657{
658 int error = 0;
659 struct i386_vm86_args ua;
660 struct vm86_kernel *vm86;
661
662 if ((error = copyin(args, &ua, sizeof(struct i386_vm86_args))) != 0)
663 return (error);
664
b7c628e4 665 if (p->p_thread->td_pcb->pcb_ext == 0)
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666 if ((error = i386_extend_pcb(p)) != 0)
667 return (error);
b7c628e4 668 vm86 = &p->p_thread->td_pcb->pcb_ext->ext_vm86;
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669
670 switch (ua.sub_op) {
671 case VM86_INIT: {
672 struct vm86_init_args sa;
673
674 if ((error = copyin(ua.sub_args, &sa, sizeof(sa))) != 0)
675 return (error);
676 if (cpu_feature & CPUID_VME)
677 vm86->vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
678 else
679 vm86->vm86_has_vme = 0;
680 vm86->vm86_inited = 1;
681 vm86->vm86_debug = sa.debug;
682 bcopy(&sa.int_map, vm86->vm86_intmap, 32);
683 }
684 break;
685
686#if 0
687 case VM86_SET_VME: {
688 struct vm86_vme_args sa;
689
690 if ((cpu_feature & CPUID_VME) == 0)
691 return (ENODEV);
692
693 if (error = copyin(ua.sub_args, &sa, sizeof(sa)))
694 return (error);
695 if (sa.state)
696 load_cr4(rcr4() | CR4_VME);
697 else
698 load_cr4(rcr4() & ~CR4_VME);
699 }
700 break;
701#endif
702
703 case VM86_GET_VME: {
704 struct vm86_vme_args sa;
705
706 sa.state = (rcr4() & CR4_VME ? 1 : 0);
707 error = copyout(&sa, ua.sub_args, sizeof(sa));
708 }
709 break;
710
711 case VM86_INTCALL: {
712 struct vm86_intcall_args sa;
713
dadab5e9 714 if ((error = suser_cred(p->p_ucred, 0)))
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715 return (error);
716 if ((error = copyin(ua.sub_args, &sa, sizeof(sa))))
717 return (error);
718 if ((error = vm86_intcall(sa.intnum, &sa.vmf)))
719 return (error);
720 error = copyout(&sa, ua.sub_args, sizeof(sa));
721 }
722 break;
723
724 default:
725 error = EINVAL;
726 }
727 return (error);
728}