Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/vm86.c
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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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/11.2/sys/i386/i386/vm86.c 332314 2018-04-09 01:06:09Z emaste $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/priv.h> 33 #include <sys/proc.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/mutex.h> 37 38 #include <vm/vm.h> 39 #include <vm/pmap.h> 40 #include <vm/vm_map.h> 41 #include <vm/vm_page.h> 42 43 #include <machine/md_var.h> 44 #include <machine/pcb.h> 45 #include <machine/pcb_ext.h> 46 #include <machine/psl.h> 47 #include <machine/specialreg.h> 48 #include <machine/sysarch.h> 49 50 extern int vm86pa; 51 extern struct pcb *vm86pcb; 52 53 static struct mtx vm86_lock; 54 55 extern int vm86_bioscall(struct vm86frame *); 56 extern void vm86_biosret(struct vm86frame *); 57 58 void vm86_prepcall(struct vm86frame *); 59 60 struct system_map { 61 int type; 62 vm_offset_t start; 63 vm_offset_t end; 64 }; 65 66 #define HLT 0xf4 67 #define CLI 0xfa 68 #define STI 0xfb 69 #define PUSHF 0x9c 70 #define POPF 0x9d 71 #define INTn 0xcd 72 #define IRET 0xcf 73 #define CALLm 0xff 74 #define OPERAND_SIZE_PREFIX 0x66 75 #define ADDRESS_SIZE_PREFIX 0x67 76 #define PUSH_MASK ~(PSL_VM | PSL_RF | PSL_I) 77 #define POP_MASK ~(PSL_VIP | PSL_VIF | PSL_VM | PSL_RF | PSL_IOPL) 78 79 static __inline caddr_t 80 MAKE_ADDR(u_short sel, u_short off) 81 { 82 return ((caddr_t)((sel << 4) + off)); 83 } 84 85 static __inline void 86 GET_VEC(u_int vec, u_short *sel, u_short *off) 87 { 88 *sel = vec >> 16; 89 *off = vec & 0xffff; 90 } 91 92 static __inline u_int 93 MAKE_VEC(u_short sel, u_short off) 94 { 95 return ((sel << 16) | off); 96 } 97 98 static __inline void 99 PUSH(u_short x, struct vm86frame *vmf) 100 { 101 vmf->vmf_sp -= 2; 102 suword16(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x); 103 } 104 105 static __inline void 106 PUSHL(u_int x, struct vm86frame *vmf) 107 { 108 vmf->vmf_sp -= 4; 109 suword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x); 110 } 111 112 static __inline u_short 113 POP(struct vm86frame *vmf) 114 { 115 u_short x = fuword16(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp)); 116 117 vmf->vmf_sp += 2; 118 return (x); 119 } 120 121 static __inline u_int 122 POPL(struct vm86frame *vmf) 123 { 124 u_int x = fuword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp)); 125 126 vmf->vmf_sp += 4; 127 return (x); 128 } 129 130 int 131 vm86_emulate(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 (curpcb->pcb_ext == 0) 146 return (SIGBUS); 147 vm86 = &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 (retcode); 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 (retcode); 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_T, 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_T, 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_vm86[0] = saved TSS descriptor, word 0 419 * pcb_vm86[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 /* 509 * called from vm86_bioscall, while in vm86 address space, to finalize setup. 510 */ 511 void 512 vm86_prepcall(struct vm86frame *vmf) 513 { 514 struct vm86_kernel *vm86; 515 uint32_t *stack; 516 uint8_t *code; 517 518 code = (void *)0xa00; 519 stack = (void *)(0x1000 - 2); /* keep aligned */ 520 if ((vmf->vmf_trapno & PAGE_MASK) <= 0xff) { 521 /* interrupt call requested */ 522 code[0] = INTn; 523 code[1] = vmf->vmf_trapno & 0xff; 524 code[2] = HLT; 525 vmf->vmf_ip = (uintptr_t)code; 526 vmf->vmf_cs = 0; 527 } else { 528 code[0] = HLT; 529 stack--; 530 stack[0] = MAKE_VEC(0, (uintptr_t)code); 531 } 532 vmf->vmf_sp = (uintptr_t)stack; 533 vmf->vmf_ss = 0; 534 vmf->kernel_fs = vmf->kernel_es = vmf->kernel_ds = 0; 535 vmf->vmf_eflags = PSL_VIF | PSL_VM | PSL_USER; 536 537 vm86 = &curpcb->pcb_ext->ext_vm86; 538 if (!vm86->vm86_has_vme) 539 vm86->vm86_eflags = vmf->vmf_eflags; /* save VIF, VIP */ 540 } 541 542 /* 543 * vm86 trap handler; determines whether routine succeeded or not. 544 * Called while in vm86 space, returns to calling process. 545 */ 546 void 547 vm86_trap(struct vm86frame *vmf) 548 { 549 caddr_t addr; 550 551 /* "should not happen" */ 552 if ((vmf->vmf_eflags & PSL_VM) == 0) 553 panic("vm86_trap called, but not in vm86 mode"); 554 555 addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip); 556 if (*(u_char *)addr == HLT) 557 vmf->vmf_trapno = vmf->vmf_eflags & PSL_C; 558 else 559 vmf->vmf_trapno = vmf->vmf_trapno << 16; 560 561 vm86_biosret(vmf); 562 } 563 564 int 565 vm86_intcall(int intnum, struct vm86frame *vmf) 566 { 567 int retval; 568 569 if (intnum < 0 || intnum > 0xff) 570 return (EINVAL); 571 572 vmf->vmf_trapno = intnum; 573 mtx_lock(&vm86_lock); 574 critical_enter(); 575 retval = vm86_bioscall(vmf); 576 critical_exit(); 577 mtx_unlock(&vm86_lock); 578 return (retval); 579 } 580 581 /* 582 * struct vm86context contains the page table to use when making 583 * vm86 calls. If intnum is a valid interrupt number (0-255), then 584 * the "interrupt trampoline" will be used, otherwise we use the 585 * caller's cs:ip routine. 586 */ 587 int 588 vm86_datacall(int intnum, struct vm86frame *vmf, struct vm86context *vmc) 589 { 590 pt_entry_t *pte = (pt_entry_t *)vm86paddr; 591 vm_paddr_t page; 592 int i, entry, retval; 593 594 mtx_lock(&vm86_lock); 595 for (i = 0; i < vmc->npages; i++) { 596 page = vtophys(vmc->pmap[i].kva & PG_FRAME); 597 entry = vmc->pmap[i].pte_num; 598 vmc->pmap[i].old_pte = pte[entry]; 599 pte[entry] = page | PG_V | PG_RW | PG_U; 600 pmap_invalidate_page(kernel_pmap, vmc->pmap[i].kva); 601 } 602 603 vmf->vmf_trapno = intnum; 604 critical_enter(); 605 retval = vm86_bioscall(vmf); 606 critical_exit(); 607 608 for (i = 0; i < vmc->npages; i++) { 609 entry = vmc->pmap[i].pte_num; 610 pte[entry] = vmc->pmap[i].old_pte; 611 pmap_invalidate_page(kernel_pmap, vmc->pmap[i].kva); 612 } 613 mtx_unlock(&vm86_lock); 614 615 return (retval); 616 } 617 618 vm_offset_t 619 vm86_getaddr(struct vm86context *vmc, u_short sel, u_short off) 620 { 621 int i, page; 622 vm_offset_t addr; 623 624 addr = (vm_offset_t)MAKE_ADDR(sel, off); 625 page = addr >> PAGE_SHIFT; 626 for (i = 0; i < vmc->npages; i++) 627 if (page == vmc->pmap[i].pte_num) 628 return (vmc->pmap[i].kva + (addr & PAGE_MASK)); 629 return (0); 630 } 631 632 int 633 vm86_getptr(struct vm86context *vmc, vm_offset_t kva, u_short *sel, 634 u_short *off) 635 { 636 int i; 637 638 for (i = 0; i < vmc->npages; i++) 639 if (kva >= vmc->pmap[i].kva && 640 kva < vmc->pmap[i].kva + PAGE_SIZE) { 641 *off = kva - vmc->pmap[i].kva; 642 *sel = vmc->pmap[i].pte_num << 8; 643 return (1); 644 } 645 return (0); 646 } 647 648 int 649 vm86_sysarch(struct thread *td, char *args) 650 { 651 int error = 0; 652 struct i386_vm86_args ua; 653 struct vm86_kernel *vm86; 654 655 if ((error = copyin(args, &ua, sizeof(struct i386_vm86_args))) != 0) 656 return (error); 657 658 if (td->td_pcb->pcb_ext == 0) 659 if ((error = i386_extend_pcb(td)) != 0) 660 return (error); 661 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 662 663 switch (ua.sub_op) { 664 case VM86_INIT: { 665 struct vm86_init_args sa; 666 667 if ((error = copyin(ua.sub_args, &sa, sizeof(sa))) != 0) 668 return (error); 669 if (cpu_feature & CPUID_VME) 670 vm86->vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0); 671 else 672 vm86->vm86_has_vme = 0; 673 vm86->vm86_inited = 1; 674 vm86->vm86_debug = sa.debug; 675 bcopy(&sa.int_map, vm86->vm86_intmap, 32); 676 } 677 break; 678 679 #if 0 680 case VM86_SET_VME: { 681 struct vm86_vme_args sa; 682 683 if ((cpu_feature & CPUID_VME) == 0) 684 return (ENODEV); 685 686 if (error = copyin(ua.sub_args, &sa, sizeof(sa))) 687 return (error); 688 if (sa.state) 689 load_cr4(rcr4() | CR4_VME); 690 else 691 load_cr4(rcr4() & ~CR4_VME); 692 } 693 break; 694 #endif 695 696 case VM86_GET_VME: { 697 struct vm86_vme_args sa; 698 699 sa.state = (rcr4() & CR4_VME ? 1 : 0); 700 error = copyout(&sa, ua.sub_args, sizeof(sa)); 701 } 702 break; 703 704 case VM86_INTCALL: { 705 struct vm86_intcall_args sa; 706 707 if ((error = priv_check(td, PRIV_VM86_INTCALL))) 708 return (error); 709 if ((error = copyin(ua.sub_args, &sa, sizeof(sa)))) 710 return (error); 711 if ((error = vm86_intcall(sa.intnum, &sa.vmf))) 712 return (error); 713 error = copyout(&sa, ua.sub_args, sizeof(sa)); 714 } 715 break; 716 717 default: 718 error = EINVAL; 719 } 720 return (error); 721 }
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