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  * $FreeBSD: src/sys/i386/i386/vm86.c,v 1.31.2.2 2001/10/05 06:18:55 peter Exp $
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/proc.h>
  32 #include <sys/lock.h>
  33 #include <sys/malloc.h>
  34
  35 #include <vm/vm.h>
  36 #include <vm/pmap.h>
  37 #include <vm/vm_map.h>
  38 #include <vm/vm_page.h>
  39
  40 #include <sys/user.h>
  41
  42 #include <machine/md_var.h>
  43 #include <machine/pcb_ext.h>    /* pcb.h included via sys/user.h */
  44 #include <machine/psl.h>
  45 #include <machine/specialreg.h>
  46 #include <machine/sysarch.h>
  47
  48 extern int i386_extend_pcb      __P((struct proc *));
  49 extern int vm86pa;
  50 extern struct pcb *vm86pcb;
  51
  52 extern int vm86_bioscall(struct vm86frame *);
  53 extern void vm86_biosret(struct vm86frame *);
  54
  55 void vm86_prepcall(struct vm86frame);
  56
  57 struct system_map {
  58         int             type;
  59         vm_offset_t     start;
  60         vm_offset_t     end;
  61 };
  62
  63 #define HLT     0xf4
  64 #define CLI     0xfa
  65 #define STI     0xfb
  66 #define PUSHF   0x9c
  67 #define POPF    0x9d
  68 #define INTn    0xcd
  69 #define IRET    0xcf
  70 #define CALLm   0xff
  71 #define OPERAND_SIZE_PREFIX     0x66
  72 #define ADDRESS_SIZE_PREFIX     0x67
  73 #define PUSH_MASK       ~(PSL_VM | PSL_RF | PSL_I)
  74 #define POP_MASK        ~(PSL_VIP | PSL_VIF | PSL_VM | PSL_RF | PSL_IOPL)
  75
  76 static __inline caddr_t
  77 MAKE_ADDR(u_short sel, u_short off)
  78 {
  79         return ((caddr_t)((sel << 4) + off));
  80 }
  81
  82 static __inline void
  83 GET_VEC(u_int vec, u_short *sel, u_short *off)
  84 {
  85         *sel = vec >> 16;
  86         *off = vec & 0xffff;
  87 }
  88
  89 static __inline u_int
  90 MAKE_VEC(u_short sel, u_short off)
  91 {
  92         return ((sel << 16) | off);
  93 }
  94
  95 static __inline void
  96 PUSH(u_short x, struct vm86frame *vmf)
  97 {
  98         vmf->vmf_sp -= 2;
  99         susword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x);
 100 }
 101
 102 static __inline void
 103 PUSHL(u_int x, struct vm86frame *vmf)
 104 {
 105         vmf->vmf_sp -= 4;
 106         suword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp), x);
 107 }
 108
 109 static __inline u_short
 110 POP(struct vm86frame *vmf)
 111 {
 112         u_short x = fusword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp));
 113
 114         vmf->vmf_sp += 2;
 115         return (x);
 116 }
 117
 118 static __inline u_int
 119 POPL(struct vm86frame *vmf)
 120 {
 121         u_int x = fuword(MAKE_ADDR(vmf->vmf_ss, vmf->vmf_sp));
 122
 123         vmf->vmf_sp += 4;
 124         return (x);
 125 }
 126
 127 int
 128 vm86_emulate(vmf)
 129         struct vm86frame *vmf;
 130 {
 131         struct vm86_kernel *vm86;
 132         caddr_t addr;
 133         u_char i_byte;
 134         u_int temp_flags;
 135         int inc_ip = 1;
 136         int retcode = 0;
 137
 138         /*
 139          * pcb_ext contains the address of the extension area, or zero if
 140          * the extension is not present.  (This check should not be needed,
 141          * as we can't enter vm86 mode until we set up an extension area)
 142          */
 143         if (curpcb->pcb_ext == 0)
 144                 return (SIGBUS);
 145         vm86 = &curpcb->pcb_ext->ext_vm86;
 146
 147         if (vmf->vmf_eflags & PSL_T)
 148                 retcode = SIGTRAP;
 149
 150         addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip);
 151         i_byte = fubyte(addr);
 152         if (i_byte == ADDRESS_SIZE_PREFIX) {
 153                 i_byte = fubyte(++addr);
 154                 inc_ip++;
 155         }
 156
 157         if (vm86->vm86_has_vme) {
 158                 switch (i_byte) {
 159                 case OPERAND_SIZE_PREFIX:
 160                         i_byte = fubyte(++addr);
 161                         inc_ip++;
 162                         switch (i_byte) {
 163                         case PUSHF:
 164                                 if (vmf->vmf_eflags & PSL_VIF)
 165                                         PUSHL((vmf->vmf_eflags & PUSH_MASK)
 166                                             | PSL_IOPL | PSL_I, vmf);
 167                                 else
 168                                         PUSHL((vmf->vmf_eflags & PUSH_MASK)
 169                                             | PSL_IOPL, vmf);
 170                                 vmf->vmf_ip += inc_ip;
 171                                 return (0);
 172
 173                         case POPF:
 174                                 temp_flags = POPL(vmf) & POP_MASK;
 175                                 vmf->vmf_eflags = (vmf->vmf_eflags & ~POP_MASK)
 176                                     | temp_flags | PSL_VM | PSL_I;
 177                                 vmf->vmf_ip += inc_ip;
 178                                 if (temp_flags & PSL_I) {
 179                                         vmf->vmf_eflags |= PSL_VIF;
 180                                         if (vmf->vmf_eflags & PSL_VIP)
 181                                                 break;
 182                                 } else {
 183                                         vmf->vmf_eflags &= ~PSL_VIF;
 184                                 }
 185                                 return (0);
 186                         }
 187                         break;
 188
 189                 /* VME faults here if VIP is set, but does not set VIF. */
 190                 case STI:
 191                         vmf->vmf_eflags |= PSL_VIF;
 192                         vmf->vmf_ip += inc_ip;
 193                         if ((vmf->vmf_eflags & PSL_VIP) == 0) {
 194                                 uprintf("fatal sti\n");
 195                                 return (SIGKILL);
 196                         }
 197                         break;
 198
 199                 /* VME if no redirection support */
 200                 case INTn:
 201                         break;
 202
 203                 /* VME if trying to set PSL_TF, or PSL_I when VIP is set */
 204                 case POPF:
 205                         temp_flags = POP(vmf) & POP_MASK;
 206                         vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
 207                             | temp_flags | PSL_VM | PSL_I;
 208                         vmf->vmf_ip += inc_ip;
 209                         if (temp_flags & PSL_I) {
 210                                 vmf->vmf_eflags |= PSL_VIF;
 211                                 if (vmf->vmf_eflags & PSL_VIP)
 212                                         break;
 213                         } else {
 214                                 vmf->vmf_eflags &= ~PSL_VIF;
 215                         }
 216                         return (retcode);
 217
 218                 /* VME if trying to set PSL_TF, or PSL_I when VIP is set */
 219                 case IRET:
 220                         vmf->vmf_ip = POP(vmf);
 221                         vmf->vmf_cs = POP(vmf);
 222                         temp_flags = POP(vmf) & POP_MASK;
 223                         vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
 224                             | temp_flags | PSL_VM | PSL_I;
 225                         if (temp_flags & PSL_I) {
 226                                 vmf->vmf_eflags |= PSL_VIF;
 227                                 if (vmf->vmf_eflags & PSL_VIP)
 228                                         break;
 229                         } else {
 230                                 vmf->vmf_eflags &= ~PSL_VIF;
 231                         }
 232                         return (retcode);
 233
 234                 }
 235                 return (SIGBUS);
 236         }
 237
 238         switch (i_byte) {
 239         case OPERAND_SIZE_PREFIX:
 240                 i_byte = fubyte(++addr);
 241                 inc_ip++;
 242                 switch (i_byte) {
 243                 case PUSHF:
 244                         if (vm86->vm86_eflags & PSL_VIF)
 245                                 PUSHL((vmf->vmf_flags & PUSH_MASK)
 246                                     | PSL_IOPL | PSL_I, vmf);
 247                         else
 248                                 PUSHL((vmf->vmf_flags & PUSH_MASK)
 249                                     | PSL_IOPL, vmf);
 250                         vmf->vmf_ip += inc_ip;
 251                         return (retcode);
 252
 253                 case POPF:
 254                         temp_flags = POPL(vmf) & POP_MASK;
 255                         vmf->vmf_eflags = (vmf->vmf_eflags & ~POP_MASK)
 256                             | temp_flags | PSL_VM | PSL_I;
 257                         vmf->vmf_ip += inc_ip;
 258                         if (temp_flags & PSL_I) {
 259                                 vm86->vm86_eflags |= PSL_VIF;
 260                                 if (vm86->vm86_eflags & PSL_VIP)
 261                                         break;
 262                         } else {
 263                                 vm86->vm86_eflags &= ~PSL_VIF;
 264                         }
 265                         return (retcode);
 266                 }
 267                 return (SIGBUS);
 268
 269         case CLI:
 270                 vm86->vm86_eflags &= ~PSL_VIF;
 271                 vmf->vmf_ip += inc_ip;
 272                 return (retcode);
 273
 274         case STI:
 275                 /* if there is a pending interrupt, go to the emulator */
 276                 vm86->vm86_eflags |= PSL_VIF;
 277                 vmf->vmf_ip += inc_ip;
 278                 if (vm86->vm86_eflags & PSL_VIP)
 279                         break;
 280                 return (retcode);
 281
 282         case PUSHF:
 283                 if (vm86->vm86_eflags & PSL_VIF)
 284                         PUSH((vmf->vmf_flags & PUSH_MASK)
 285                             | PSL_IOPL | PSL_I, vmf);
 286                 else
 287                         PUSH((vmf->vmf_flags & PUSH_MASK) | PSL_IOPL, vmf);
 288                 vmf->vmf_ip += inc_ip;
 289                 return (retcode);
 290
 291         case INTn:
 292                 i_byte = fubyte(addr + 1);
 293                 if ((vm86->vm86_intmap[i_byte >> 3] & (1 << (i_byte & 7))) != 0)
 294                         break;
 295                 if (vm86->vm86_eflags & PSL_VIF)
 296                         PUSH((vmf->vmf_flags & PUSH_MASK)
 297                             | PSL_IOPL | PSL_I, vmf);
 298                 else
 299                         PUSH((vmf->vmf_flags & PUSH_MASK) | PSL_IOPL, vmf);
 300                 PUSH(vmf->vmf_cs, vmf);
 301                 PUSH(vmf->vmf_ip + inc_ip + 1, vmf);    /* increment IP */
 302                 GET_VEC(fuword((caddr_t)(i_byte * 4)),
 303                      &vmf->vmf_cs, &vmf->vmf_ip);
 304                 vmf->vmf_flags &= ~PSL_T;
 305                 vm86->vm86_eflags &= ~PSL_VIF;
 306                 return (retcode);
 307
 308         case IRET:
 309                 vmf->vmf_ip = POP(vmf);
 310                 vmf->vmf_cs = POP(vmf);
 311                 temp_flags = POP(vmf) & POP_MASK;
 312                 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
 313                     | temp_flags | PSL_VM | PSL_I;
 314                 if (temp_flags & PSL_I) {
 315                         vm86->vm86_eflags |= PSL_VIF;
 316                         if (vm86->vm86_eflags & PSL_VIP)
 317                                 break;
 318                 } else {
 319                         vm86->vm86_eflags &= ~PSL_VIF;
 320                 }
 321                 return (retcode);
 322
 323         case POPF:
 324                 temp_flags = POP(vmf) & POP_MASK;
 325                 vmf->vmf_flags = (vmf->vmf_flags & ~POP_MASK)
 326                     | temp_flags | PSL_VM | PSL_I;
 327                 vmf->vmf_ip += inc_ip;
 328                 if (temp_flags & PSL_I) {
 329                         vm86->vm86_eflags |= PSL_VIF;
 330                         if (vm86->vm86_eflags & PSL_VIP)
 331                                 break;
 332                 } else {
 333                         vm86->vm86_eflags &= ~PSL_VIF;
 334                 }
 335                 return (retcode);
 336         }
 337         return (SIGBUS);
 338 }
 339
 340 #define PGTABLE_SIZE    ((1024 + 64) * 1024 / PAGE_SIZE)
 341 #define INTMAP_SIZE     32
 342 #define IOMAP_SIZE      ctob(IOPAGES)
 343 #define TSS_SIZE \
 344         (sizeof(struct pcb_ext) - sizeof(struct segment_descriptor) + \
 345          INTMAP_SIZE + IOMAP_SIZE + 1)
 346
 347 struct vm86_layout {
 348         pt_entry_t      vml_pgtbl[PGTABLE_SIZE];
 349         struct  pcb vml_pcb;
 350         struct  pcb_ext vml_ext;
 351         char    vml_intmap[INTMAP_SIZE];
 352         char    vml_iomap[IOMAP_SIZE];
 353         char    vml_iomap_trailer;
 354 };
 355
 356 void
 357 vm86_initialize(void)
 358 {
 359         int i;
 360         u_int *addr;
 361         struct vm86_layout *vml = (struct vm86_layout *)vm86paddr;
 362         struct pcb *pcb;
 363         struct pcb_ext *ext;
 364         struct soft_segment_descriptor ssd = {
 365                 0,                      /* segment base address (overwritten) */
 366                 0,                      /* length (overwritten) */
 367                 SDT_SYS386TSS,          /* segment type */
 368                 0,                      /* priority level */
 369                 1,                      /* descriptor present */
 370                 0, 0,
 371                 0,                      /* default 16 size */
 372                 0                       /* granularity */
 373         };
 374
 375         /*
 376          * this should be a compile time error, but cpp doesn't grok sizeof().
 377          */
 378         if (sizeof(struct vm86_layout) > ctob(3))
 379                 panic("struct vm86_layout exceeds space allocated in locore.s");
 380
 381         /*
 382          * Below is the memory layout that we use for the vm86 region.
 383          *
 384          * +--------+
 385          * |        |
 386          * |        |
 387          * | page 0 |
 388          * |        | +--------+
 389          * |        | | stack  |
 390          * +--------+ +--------+ <--------- vm86paddr
 391          * |        | |Page Tbl| 1M + 64K = 272 entries = 1088 bytes
 392          * |        | +--------+
 393          * |        | |  PCB   | size: ~240 bytes
 394          * | page 1 | |PCB Ext | size: ~140 bytes (includes TSS)
 395          * |        | +--------+
 396          * |        | |int map |
 397          * |        | +--------+
 398          * +--------+ |        |
 399          * | page 2 | |  I/O   |
 400          * +--------+ | bitmap |
 401          * | page 3 | |        |
 402          * |        | +--------+
 403          * +--------+
 404          */
 405
 406         /*
 407          * A rudimentary PCB must be installed, in order to get to the
 408          * PCB extension area.  We use the PCB area as a scratchpad for
 409          * data storage, the layout of which is shown below.
 410          *
 411          * pcb_esi      = new PTD entry 0
 412          * pcb_ebp      = pointer to frame on vm86 stack
 413          * pcb_esp      =    stack frame pointer at time of switch
 414          * pcb_ebx      = va of vm86 page table
 415          * pcb_eip      =    argument pointer to initial call
 416          * pcb_spare[0] =    saved TSS descriptor, word 0
 417          * pcb_space[1] =    saved TSS descriptor, word 1
 418          */
 419 #define new_ptd         pcb_esi
 420 #define vm86_frame      pcb_ebp
 421 #define pgtable_va      pcb_ebx
 422
 423         pcb = &vml->vml_pcb;
 424         ext = &vml->vml_ext;
 425
 426         bzero(pcb, sizeof(struct pcb));
 427         pcb->new_ptd = vm86pa | PG_V | PG_RW | PG_U;
 428         pcb->vm86_frame = vm86paddr - sizeof(struct vm86frame);
 429         pcb->pgtable_va = vm86paddr;
 430         pcb->pcb_ext = ext;
 431
 432         bzero(ext, sizeof(struct pcb_ext));
 433         ext->ext_tss.tss_esp0 = vm86paddr;
 434         ext->ext_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
 435         ext->ext_tss.tss_ioopt =
 436                 ((u_int)vml->vml_iomap - (u_int)&ext->ext_tss) << 16;
 437         ext->ext_iomap = vml->vml_iomap;
 438         ext->ext_vm86.vm86_intmap = vml->vml_intmap;
 439
 440         if (cpu_feature & CPUID_VME)
 441                 ext->ext_vm86.vm86_has_vme = (rcr4() & CR4_VME ? 1 : 0);
 442
 443         addr = (u_int *)ext->ext_vm86.vm86_intmap;
 444         for (i = 0; i < (INTMAP_SIZE + IOMAP_SIZE) / sizeof(u_int); i++)
 445                 *addr++ = 0;
 446         vml->vml_iomap_trailer = 0xff;
 447
 448         ssd.ssd_base = (u_int)&ext->ext_tss;
 449         ssd.ssd_limit = TSS_SIZE - 1;
 450         ssdtosd(&ssd, &ext->ext_tssd);
 451
 452         vm86pcb = pcb;
 453
 454 #if 0
 455         /*
 456          * use whatever is leftover of the vm86 page layout as a
 457          * message buffer so we can capture early output.
 458          */
 459         msgbufinit((vm_offset_t)vm86paddr + sizeof(struct vm86_layout),
 460             ctob(3) - sizeof(struct vm86_layout));
 461 #endif
 462 }
 463
 464 vm_offset_t
 465 vm86_getpage(struct vm86context *vmc, int pagenum)
 466 {
 467         int i;
 468
 469         for (i = 0; i < vmc->npages; i++)
 470                 if (vmc->pmap[i].pte_num == pagenum)
 471                         return (vmc->pmap[i].kva);
 472         return (0);
 473 }
 474
 475 vm_offset_t
 476 vm86_addpage(struct vm86context *vmc, int pagenum, vm_offset_t kva)
 477 {
 478         int i, flags = 0;
 479
 480         for (i = 0; i < vmc->npages; i++)
 481                 if (vmc->pmap[i].pte_num == pagenum)
 482                         goto bad;
 483
 484         if (vmc->npages == VM86_PMAPSIZE)
 485                 goto bad;                       /* XXX grow map? */
 486
 487         if (kva == 0) {
 488                 kva = (vm_offset_t)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
 489                 flags = VMAP_MALLOC;
 490         }
 491
 492         i = vmc->npages++;
 493         vmc->pmap[i].flags = flags;
 494         vmc->pmap[i].kva = kva;
 495         vmc->pmap[i].pte_num = pagenum;
 496         return (kva);
 497 bad:
 498         panic("vm86_addpage: not enough room, or overlap");
 499 }
 500
 501 static void
 502 vm86_initflags(struct vm86frame *vmf)
 503 {
 504         int eflags = vmf->vmf_eflags;
 505         struct vm86_kernel *vm86 = &curpcb->pcb_ext->ext_vm86;
 506
 507         if (vm86->vm86_has_vme) {
 508                 eflags = (vmf->vmf_eflags & ~VME_USERCHANGE) |
 509                     (eflags & VME_USERCHANGE) | PSL_VM;
 510         } else {
 511                 vm86->vm86_eflags = eflags;     /* save VIF, VIP */
 512                 eflags = (vmf->vmf_eflags & ~VM_USERCHANGE) |
 513                     (eflags & VM_USERCHANGE) | PSL_VM;
 514         }
 515         vmf->vmf_eflags = eflags | PSL_VM;
 516 }
 517
 518 /*
 519  * called from vm86_bioscall, while in vm86 address space, to finalize setup.
 520  */
 521 void
 522 vm86_prepcall(struct vm86frame vmf)
 523 {
 524         uintptr_t addr[] = { 0xA00, 0x1000 };   /* code, stack */
 525         u_char intcall[] = {
 526                 CLI, INTn, 0x00, STI, HLT
 527         };
 528
 529         if ((vmf.vmf_trapno & PAGE_MASK) <= 0xff) {
 530                 /* interrupt call requested */
 531                 intcall[2] = (u_char)(vmf.vmf_trapno & 0xff);
 532                 memcpy((void *)addr[0], (void *)intcall, sizeof(intcall));
 533                 vmf.vmf_ip = addr[0];
 534                 vmf.vmf_cs = 0;
 535         }
 536         vmf.vmf_sp = addr[1] - 2;              /* keep aligned */
 537         vmf.kernel_fs = vmf.kernel_es = vmf.kernel_ds = 0;
 538         vmf.vmf_ss = 0;
 539         vmf.vmf_eflags = PSL_VIF | PSL_VM | PSL_USER;
 540         vm86_initflags(&vmf);
 541 }
 542
 543 /*
 544  * vm86 trap handler; determines whether routine succeeded or not.
 545  * Called while in vm86 space, returns to calling process.
 546  */
 547 void
 548 vm86_trap(struct vm86frame *vmf)
 549 {
 550         caddr_t addr;
 551
 552         /* "should not happen" */
 553         if ((vmf->vmf_eflags & PSL_VM) == 0)
 554                 panic("vm86_trap called, but not in vm86 mode");
 555
 556         addr = MAKE_ADDR(vmf->vmf_cs, vmf->vmf_ip);
 557         if (*(u_char *)addr == HLT)
 558                 vmf->vmf_trapno = vmf->vmf_eflags & PSL_C;
 559         else
 560                 vmf->vmf_trapno = vmf->vmf_trapno << 16;
 561
 562         vm86_biosret(vmf);
 563 }
 564
 565 int
 566 vm86_intcall(int intnum, struct vm86frame *vmf)
 567 {
 568         if (intnum < 0 || intnum > 0xff)
 569                 return (EINVAL);
 570
 571         vmf->vmf_trapno = intnum;
 572         return (vm86_bioscall(vmf));
 573 }
 574
 575 /*
 576  * struct vm86context contains the page table to use when making
 577  * vm86 calls.  If intnum is a valid interrupt number (0-255), then
 578  * the "interrupt trampoline" will be used, otherwise we use the
 579  * caller's cs:ip routine.
 580  */
 581 int
 582 vm86_datacall(intnum, vmf, vmc)
 583         int intnum;
 584         struct vm86frame *vmf;
 585         struct vm86context *vmc;
 586 {
 587         pt_entry_t pte = (pt_entry_t)vm86paddr;
 588         u_int page;
 589         int i, entry, retval;
 590
 591         for (i = 0; i < vmc->npages; i++) {
 592                 page = vtophys(vmc->pmap[i].kva & PG_FRAME);
 593                 entry = vmc->pmap[i].pte_num;
 594                 vmc->pmap[i].old_pte = pte[entry];
 595                 pte[entry] = page | PG_V | PG_RW | PG_U;
 596         }
 597
 598         vmf->vmf_trapno = intnum;
 599         retval = vm86_bioscall(vmf);
 600
 601         for (i = 0; i < vmc->npages; i++) {
 602                 entry = vmc->pmap[i].pte_num;
 603                 pte[entry] = vmc->pmap[i].old_pte;
 604         }
 605
 606         return (retval);
 607 }
 608
 609 vm_offset_t
 610 vm86_getaddr(vmc, sel, off)
 611         struct vm86context *vmc;
 612         u_short sel;
 613         u_short off;
 614 {
 615         int i, page;
 616         vm_offset_t addr;
 617
 618         addr = (vm_offset_t)MAKE_ADDR(sel, off);
 619         page = addr >> PAGE_SHIFT;
 620         for (i = 0; i < vmc->npages; i++)
 621                 if (page == vmc->pmap[i].pte_num)
 622                         return (vmc->pmap[i].kva + (addr & PAGE_MASK));
 623         return (0);
 624 }
 625
 626 int
 627 vm86_getptr(vmc, kva, sel, off)
 628         struct vm86context *vmc;
 629         vm_offset_t kva;
 630         u_short *sel;
 631         u_short *off;
 632 {
 633         int i;
 634
 635         for (i = 0; i < vmc->npages; i++)
 636                 if (kva >= vmc->pmap[i].kva &&
 637                     kva < vmc->pmap[i].kva + PAGE_SIZE) {
 638                         *off = kva - vmc->pmap[i].kva;
 639                         *sel = vmc->pmap[i].pte_num << 8;
 640                         return (1);
 641                 }
 642         return (0);
 643         panic("vm86_getptr: address not found");
 644 }
 645
 646 int
 647 vm86_sysarch(p, args)
 648         struct proc *p;
 649         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 (p->p_addr->u_pcb.pcb_ext == 0)
 659                 if ((error = i386_extend_pcb(p)) != 0)
 660                         return (error);
 661         vm86 = &p->p_addr->u_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 = suser(p)))
 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 }