wok-current annotate memtest/stuff/bootloader.S @ rev 20179

ipxe: update bootloader
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sat Jan 27 12:56:10 2018 +0100 (2018-01-27)
parents 9ca81337dc6e
children 1421f93cc28a
rev   line source
pascal@20179 1 // Image/zImage & tiny bzImage linux kernel boot sector, (C) SliTaz, GPL2.
pascal@19941 2
pascal@15188 3 SYSSEG = 0x1000
pascal@15188 4 INITSEG = 0x9000
pascal@15188 5 SETUPSEG = 0x9020
pascal@19941 6 setup_sects = 497
pascal@19941 7 syssize = 500
pascal@20179 8 cmd_line_ptr = 0x228
pascal@15188 9
pascal@15188 10 .text
pascal@15188 11 .code16
pascal@15188 12 .org 0
pascal@15188 13 .globl _start
pascal@15188 14 _start:
pascal@15188 15
pascal@19399 16 #define CODESZ 512 /* patched by installer */
pascal@15188 17
pascal@20179 18 //#define BZIMAGE 0x207 /* setup version ; for bzImage < 512 Kb only */
pascal@20179 19
pascal@15188 20 /* some extra features */
pascal@15188 21 #define EXE_SUPPORT real mode dos .exe file support
pascal@20179 22 #define CMDLINE kernel cmdline support
pascal@19941 23 #define VCPI VCPI 4.0 support
pascal@19399 24 #define SHUTDOWNDOS shutdown DOS services
pascal@15188 25
pascal@20179 26 /* some contraints to reduce the code size */
pascal@19941 27 //#define FLOPPY_1440K_ONLY 1.44M floppies support only -33
pascal@19941 28 //#define FLOPPY_HAS_2_SIDES hardcoded heads count to 2 -13
pascal@20179 29 //#define NO_CMDLINE_SHRINK remove heading spaces ? -6-20
pascal@19949 30 //#define NO_CMDLINE_FILE remove @cmdline file support ? -20
pascal@19941 31 //#define NO_DOTS show progression dots ? -8
pascal@20179 32 #ifndef BZIMAGE
pascal@20179 33 //#defime NO_MINSETUP default setup (dos only) ? -4
pascal@20179 34 //#define NO_CURSOR_DEFINITION -8
pascal@20179 35 #endif
pascal@15188 36
pascal@15188 37 #ifdef EXE_SUPPORT
pascal@19399 38 #define EXEADRS(x) (x+0xE0)
pascal@19941 39 #define FLAT20(x) (x+16*INITSEG)
pascal@19941 40
pascal@19941 41 .macro trace_int19
pascal@19941 42 pushl $4
pascal@19941 43 popw %si
pascal@19941 44 popw %ds
pascal@19400 45 pushl (%si)
pascal@19941 46 movl $step19+(INITSEG<<16), (%si)
pascal@19399 47 pushfw
pascal@19399 48 popw %ax
pascal@19399 49 incb %ah # set TF
pascal@19399 50 pushw %ax
pascal@19399 51 popfw
pascal@19400 52 ljmp *4*0x19-4(%si)
pascal@19941 53 .endm
pascal@19941 54
pascal@19941 55 stacktop = 0x9E00 # in 0x8000 .. 0xA000
pascal@19941 56 decw %bp // Magic number: MZ
pascal@19941 57 popw %dx
pascal@19941 58 jmp start // Bytes on last page of file
pascal@19941 59 .word (CODESZ+511)/512 // Pages in file INSTALLER
pascal@19941 60 .word 0 // Relocations
pascal@19941 61 .word (end_header-_start)/16 // Size of header in paragraphs
pascal@19949 62 .word 4096 // Minimum extra paragraphs needed
pascal@19941 63 .word -1 // Maximum extra paragraphs needed
pascal@19941 64 .word (CODESZ+15)/16 // Initial (relative) SS value INSTALLER
pascal@19941 65 .word stacktop // Initial SP value
pascal@19941 66 .word 0 // Checksum INSTALLER?
pascal@19941 67 .word EXEADRS(comstart) // Initial IP value
pascal@19941 68 .word 0xFFF0 // Initial (relative) CS value
pascal@19941 69 // .word 0x001C // File address of relocation table
pascal@19941 70 // .word 0,0,0 // Overlay number
pascal@19399 71 #endif
pascal@15188 72 start:
pascal@19941 73 xorw %ax, %ax # %ax = 0
pascal@20179 74 #ifdef BZIMAGE
pascal@20179 75 zeroed = 14 # zeroed registers
pascal@20179 76 #else
pascal@15188 77 zeroed = 12 # zeroed registers
pascal@20179 78 #endif
pascal@20179 79 movw $zeroed/2, %cx # clear gdt + offset, %ds, limits
pascal@19941 80 stacktop = 0x9E00 # in 0x8000 .. 0xA000 (+zeroed+12)
pascal@19941 81 pushw $INITSEG
pascal@19941 82 end_header:
pascal@20179 83 cld # assume nothing
pascal@20179 84 #if defined(BZIMAGE) && BZIMAGE >= 0x202
pascal@20179 85 popw %es # %es contain INITSEG
pascal@20179 86 movw %es, %di
pascal@20179 87 #else
pascal@19941 88 # cmdline offset at 0x22
pascal@19941 89 movw $stacktop, %di # stacktop is an arbitrary value >=
pascal@15188 90 # length of bootsect + length of
pascal@15188 91 # setup + room for stack;
pascal@15188 92 # 12 is disk parm size.
pascal@20179 93 popw %es # %es contain INITSEG
pascal@20179 94 #endif
pascal@20179 95 pushw %es
pascal@20179 96 popw %ss # %es = %ss = INITSEG
pascal@15188 97 movw %di, %sp # put stack at INITSEG:stacktop-...
pascal@19941 98 #ifdef EXE_SUPPORT
pascal@20179 99 cwd # force %dx = 0 (floppy only)
pascal@19941 100 #endif
pascal@15188 101
pascal@15188 102 # Many BIOS's default disk parameter tables will not recognize
pascal@15188 103 # multi-sector reads beyond the maximum sector number specified
pascal@15188 104 # in the default diskette parameter tables - this may mean 7
pascal@15188 105 # sectors in some cases.
pascal@15188 106 #
pascal@15188 107 # Since single sector reads are slow and out of the question,
pascal@15188 108 # we must take care of this by creating new parameter tables
pascal@15188 109 # (for the first disk) in RAM. We can set the maximum sector
pascal@15188 110 # count to 36 - the most we will encounter on an ED 2.88.
pascal@15188 111 #
pascal@15188 112 # High doesn't hurt. Low does. Let's use the max: 63
pascal@15188 113
pascal@15188 114 rep # don't worry about cld
pascal@15188 115 stosw # already done above
pascal@15188 116 popw %bx # offset = 0
pascal@15188 117 popw %ds # %ds = 0
pascal@15188 118 popw %fs # %fs = 0
pascal@15188 119
pascal@15188 120 movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0)
pascal@15188 121 incw %ax
pascal@15188 122
pascal@15188 123 ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address
pascal@15188 124 pushw %es
pascal@15188 125 pushw %di
pascal@15188 126 movb $6, %cl # copy 12 bytes
pascal@15188 127 rep # don't worry about cld
pascal@15188 128 movsw # already done above
pascal@15188 129 pushw %ss
pascal@15188 130 popw %ds # now %ds = %es = %ss = INITSEG
pascal@15188 131 popl %fs:0x78(%bx) # update parameter table address
pascal@15188 132 movb $63, 0x4-12(%di) # patch sector count, %di = stacktop
pascal@15188 133 cli
pascal@15188 134
pascal@15188 135 xchg %ax, %di # sector count
pascal@15188 136 popw %ax # limits = 0
pascal@15188 137 incw %cx # cylinder 0, sector 1, clear Z
pascal@15188 138 call read_first_sectors # read setup
pascal@15188 139
pascal@15188 140 # This routine loads the system at address LOADSEG, making sure
pascal@15188 141 # no 64kB boundaries are crossed. We try to load it as fast as
pascal@15188 142 # possible, loading whole tracks whenever we can.
pascal@15188 143
pascal@19941 144 #ifndef NO_DOTS
pascal@15188 145 popw %bx # clear %bx
pascal@19941 146 #endif
pascal@15188 147 movw syssize, %di
pascal@17223 148 decw %di
pascal@15188 149 shrw $9-4, %di
pascal@17223 150 incw %di
pascal@15188 151 movw $SYSSEG, %cx
pascal@20179 152 #ifdef BZIMAGE
pascal@20179 153 push %cx
pascal@20179 154 #endif
pascal@15188 155 call read_sectorsCX
pascal@15188 156
pascal@15188 157 # This procedure turns off the floppy drive motor, so
pascal@15188 158 # that we enter the kernel in a known state, and
pascal@15188 159 # don't have to worry about it later.
pascal@15188 160
pascal@15188 161 kill_motor:
pascal@15188 162 xchgw %ax, %di # reset FDC (%di < 128)
pascal@15188 163 int $0x13
pascal@15188 164
pascal@15188 165 # After that (everything loaded), we jump to the setup-routine
pascal@15188 166 # loaded directly after the bootblock:
pascal@15188 167 # Segments are as follows: %ds = %ss = INITSEG
pascal@15188 168
pascal@20179 169 #ifdef BZIMAGE
pascal@20179 170 popw %bx
pascal@20179 171 popw %si // SYSSEG:0
pascal@20179 172 movesys: // %bx = DS, %si
pascal@20179 173 movw $16, %ax
pascal@20179 174 mulw %bx
pascal@20179 175 addw %si, %ax
pascal@20179 176 adcw $0x9300, %dx // %dx:%ax src flat address
pascal@20179 177 movw $9, %cx
pascal@20179 178 zero1:
pascal@20179 179 pushw $0 // 2E..1E
pascal@20179 180 loop zero1
pascal@20179 181 //pushl $0x93100000 // 1A: dest
pascal@20179 182 pushw $0x9310
pascal@20179 183 pushw %cx
pascal@20179 184 pushw $-1 // 18
pascal@20179 185 pushw %cx // 16
pascal@20179 186 pushw %dx // src
pascal@20179 187 pushw %ax
pascal@20179 188 pushw $-1 // 10
pascal@20179 189 movb $8, %cl
pascal@20179 190 movw %cx, %bx // will move 8*64 = 512Kb
pascal@20179 191 zero2:
pascal@20179 192 pushw $0 // 0E..00
pascal@20179 193 loop zero2
pascal@20179 194 movw %sp, %si
pascal@20179 195 pushw %ss
pascal@20179 196 popw %es
pascal@20179 197 pushw %es
pascal@20179 198 popw %ds
pascal@20179 199 syslp:
pascal@20179 200 movb $0x80, %ch
pascal@20179 201 movb $0x87, %ah
pascal@20179 202 int $0x15
pascal@20179 203 incb 0x14(%si)
pascal@20179 204 incb 0x1C(%si)
pascal@20179 205 decw %bx
pascal@20179 206 jne syslp
pascal@20179 207 #endif
pascal@15188 208 jmp_setup:
pascal@15188 209 ljmp $SETUPSEG, $0
pascal@15188 210
pascal@15188 211 #ifdef EXE_SUPPORT
pascal@19399 212 #ifdef SHUTDOWNDOS
pascal@19399 213 doiret:
pascal@19399 214 iret
pascal@19399 215 step19:
pascal@19399 216 pushw %si
pascal@19399 217 pushw %ds
pascal@19399 218 movw %sp, %si
pascal@19399 219 ldsw %ss:4(%si), %si
pascal@19399 220 cmpw $0x19CD, (%si)
pascal@19399 221 popw %ds
pascal@19399 222 popw %si
pascal@19399 223 jne doiret
pascal@19399 224 xorw %si, %si
pascal@19402 225 movw %si, %ds
pascal@19401 226 pushw %cs
pascal@19401 227 popw %ss
pascal@19400 228 movw $stacktop-4-16, %sp
pascal@19399 229 popl 4(%si)
pascal@19399 230 popaw
pascal@20179 231 #ifdef BZIMAGE
pascal@20179 232 jmp movesys
pascal@19399 233 #endif
pascal@20179 234 #endif
pascal@20179 235 #ifndef BZIMAGE
pascal@19941 236 movesys: // %ax = SYSSEG, %bx = DS, %si
pascal@19193 237 shrw $4, %si
pascal@19193 238 addw %si, %bx
pascal@17223 239 subw %ax, %bx
pascal@15188 240 jnc forward
pascal@20179 241 movb $0x90, %ah
pascal@20179 242 ;decw %ax
pascal@15188 243 forward:
pascal@15188 244 movw %ax, %es
pascal@20179 245 movw %ax, %di
pascal@20179 246 addw %bx, %di
pascal@20179 247 movw %di, %ds
pascal@20179 248 sbbw %di, %di // %di = 0 : -1
pascal@17223 249 cmc // C = 1 : 0
pascal@20179 250 adcw %di, %ax
pascal@19193 251 xorw %si, %si
pascal@15188 252 xorw %di, %di
pascal@20179 253 movb $0x10, %cl
pascal@20179 254 cmpb %cl, %ah // move 512k
pascal@15188 255 rep
pascal@20179 256 movsb
pascal@15188 257 jns forward
pascal@15188 258 #ifndef NO_CURSOR_DEFINITION
pascal@15188 259 movb $1, %ah
pascal@15188 260 movb $0, %bh
pascal@15188 261 movb $0x20, %ch // 0x2000
pascal@15188 262 int $0x10
pascal@15188 263 #endif
pascal@15188 264 pushw %ss
pascal@15188 265 popw %ds
pascal@15188 266 jmp jmp_setup
pascal@20179 267 #endif
pascal@19941 268 comstart:
pascal@19941 269 cld # assume nothing
pascal@19941 270 pushw $INITSEG
pascal@19941 271 popw %es
pascal@19941 272 #ifdef CMDLINE
pascal@19941 273 movw %sp, %di
pascal@19941 274 movw $0x80, %si
pascal@19941 275 lodsb
pascal@19941 276 cbw
pascal@19941 277 xchgw %ax, %cx
pascal@19941 278 jcxz nocmdline
pascal@20179 279 # if defined(BZIMAGE) && BZIMAGE >= 0x202
pascal@20179 280 movw $INITSEG/16+stacktop/256, EXEADRS(cmd_line_ptr+1)
pascal@20179 281 # else
pascal@19941 282 movw $0xA33F, 0x7F(%si)
pascal@20179 283 # endif
pascal@19941 284 # ifndef NO_CMDLINE_SHRINK
pascal@19941 285 skipspace:
pascal@19941 286 lodsb
pascal@19941 287 cmpb $0x20, %al
pascal@19941 288 je skipspace
pascal@19949 289 # ifndef NO_CMDLINE_FILE
pascal@19949 290 movw %si,%dx
pascal@19941 291 decw %si
pascal@19949 292 subb $'@',%al
pascal@19949 293 jne notafile
pascal@19949 294 movb $0x3D,%ah
pascal@19949 295 int $0x21
pascal@19949 296 jc notafile
pascal@19949 297 xchgw %ax,%bx
pascal@19949 298 //movw %si,%dx // ~320 bytes max
pascal@19949 299 movw $EXEADRS(notafile)-130,%cx
pascal@19949 300 movb $0x3F,%ah
pascal@19949 301 int $0x21
pascal@19949 302 xchgw %ax,%cx
pascal@19949 303 notafile:
pascal@19949 304 # else
pascal@19949 305 decw %si
pascal@19949 306 # endif
pascal@19941 307 # endif
pascal@19941 308 rep
pascal@19941 309 movsb
pascal@19941 310 nocmdline:
pascal@20179 311 orb EXEADRS(setup_sects), %ch
pascal@20179 312 # ifndef NO_MINSETUP
pascal@20179 313 # ifndef BZIMAGE
pascal@20179 314 jnz setupok
pascal@20179 315 mov $4, %ch
pascal@20179 316 setupok:
pascal@20179 317 # endif
pascal@20179 318 # endif
pascal@20179 319 #else
pascal@20179 320 movb EXEADRS(setup_sects), %ch
pascal@15188 321 #endif
pascal@19941 322 movb $(512-(end_header-_start))/2, %cl
pascal@19941 323 movw $0x100, %si
pascal@19941 324 movw $end_header, %di
pascal@19941 325 rep
pascal@19941 326 movsw
pascal@19941 327 movw $SYSSEG, %ax
pascal@19941 328 movw %ds, %bx
pascal@19941 329 pushw %es
pascal@19941 330 popw %ss
pascal@19941 331 #ifndef SHUTDOWNDOS
pascal@19941 332 pushw %es
pascal@19941 333 pushw $movesys
pascal@15188 334 #endif
pascal@19941 335 #ifdef VCPI
pascal@19941 336 pushaw
pascal@19941 337 smsww %ax
pascal@19941 338 andb $1, %al
pascal@19941 339 je isrm
pascal@19941 340 movw $EXEADRS(gdt_vcpi),%si
pascal@20179 341 movw $pagebuf-0x90000,%di // %es = 0x9000
pascal@20179 342 movl $pagebuf+3,%es:0x1000(%di)
pascal@19941 343 call_vcpi:
pascal@19941 344 movb $0xDE,%ah // DE01, EBX = getiface(DS:SI, ES:DI)
pascal@19941 345 int $0x67
pascal@19941 346 movl $FLAT20(sw2pm_params),%esi
pascal@19941 347 movb $0x0C,%al // DE0C switchpm(ESI)
pascal@19941 348 cli
pascal@19941 349 jmp call_vcpi
pascal@19941 350 pm_code:
pascal@19941 351 movl %cr0,%eax
pascal@19941 352 andl $0x7FFFFFFE,%eax
pascal@19941 353 movl %eax,%cr0
pascal@19941 354 movl %eax,%cr3
pascal@19941 355 isrm:
pascal@19941 356 # ifdef SHUTDOWNDOS
pascal@19941 357 trace_int19
pascal@19941 358 # else
pascal@19941 359 lssw %cs:EXEADRS(saved_ss_sp),%sp
pascal@19941 360 popaw
pascal@19941 361 retf
pascal@19941 362 # endif
pascal@19941 363 #else
pascal@19941 364 # ifdef SHUTDOWNDOS
pascal@19941 365 pushaw
pascal@19941 366 trace_int19
pascal@19941 367 # endif
pascal@19941 368 retf
pascal@19941 369 #endif
pascal@19941 370 #endif
pascal@15188 371
pascal@15188 372 # read_sectors reads %di sectors into %es:0 buffer.
pascal@15188 373 # %es:0 is updated to the next memory location.
pascal@15188 374 # First, sectors are read sector by sector until
pascal@15188 375 # sector per track count is known. Then they are
pascal@15188 376 # read track by track.
pascal@15188 377 # Assume no error on first track.
pascal@15188 378
pascal@15188 379 #ifdef FLOPPY_1440K_ONLY
pascal@19941 380 #define FLOPPY_HAS_2_SIDES hardcore heads count to 2
pascal@15188 381 #define FLOPPY_SECTORS 18 /* 18 sectors */
pascal@15188 382 #else
pascal@15188 383 #define FLOPPY_HEADS 2 /* 2 heads minimum */
pascal@15188 384 #endif
pascal@15188 385
pascal@19941 386 return:
pascal@19941 387 #ifndef NO_DOTS
pascal@19941 388 movw $0xE2E,%ax
pascal@19941 389 movb $7,%bl
pascal@19941 390 int $0x10
pascal@19941 391 #endif
pascal@19941 392 ret
pascal@19941 393
pascal@15188 394 check_limits:
pascal@15188 395 #ifndef FLOPPY_1440K_ONLY
pascal@15188 396 popw %dx
pascal@15188 397 cmpb %al, %cl # max sector known ?
pascal@15188 398 ja next_head # no -> store it
pascal@19941 399 #ifndef FLOPPY_HAS_2_SIDES
pascal@15188 400 #ifdef FLOPPY_HEADS
pascal@15188 401 cmpb $FLOPPY_HEADS, %dh # 2 heads minimum
pascal@15188 402 jb check_cylinder
pascal@15188 403 #endif
pascal@15188 404 cmpb %ah, %dh # max head known ?
pascal@15188 405 ja next_cylinder # no -> store it
pascal@15188 406 check_cylinder:
pascal@15188 407 #endif
pascal@19941 408 #endif
pascal@15188 409 pushaw
pascal@15188 410 #ifndef FLOPPY_1440K_ONLY
pascal@15188 411 cbw # %ah = 0
pascal@15188 412 #endif
pascal@15188 413 int $0x13 # reset controler
pascal@15188 414 popaw
pascal@15188 415 movb $1, %al # sector by sector...
pascal@15188 416 read_sectorslp:
pascal@15188 417 pushw %dx # some bios break dx...
pascal@15188 418 #ifndef FLOPPY_1440K_ONLY
pascal@15188 419 pushw %ax # limits
pascal@15188 420 subb %cl, %al # sectors remaining in track
pascal@15188 421 ja tolastsect
pascal@15188 422 movb $1, %al # 1 sector mini
pascal@15188 423 tolastsect:
pascal@15188 424 #else
pascal@19402 425 movb $FLOPPY_SECTORS+1, %al
pascal@15188 426 subb %cl, %al # sectors remaining in track
pascal@15188 427 #endif
pascal@15188 428 cbw
pascal@15188 429 cmpw %di, %ax
pascal@15188 430 jb more1trk
pascal@15188 431 movw %di, %ax # sectors to read
pascal@15188 432 more1trk:
pascal@15188 433 pushw %ax # save context
pascal@15188 434 movb $2, %ah # cmd: read chs
pascal@15188 435 int $0x13
pascal@15188 436 #ifndef FLOPPY_1440K_ONLY
pascal@15188 437 popw %dx # save %ax
pascal@15188 438 popw %ax # limits
pascal@15188 439 #else
pascal@15188 440 popw %ax # restore context
pascal@15188 441 popw %dx
pascal@15188 442 #endif
pascal@15188 443 jc check_limits
pascal@15188 444 #ifndef FLOPPY_1440K_ONLY
pascal@15188 445 xchgw %ax, %bp
pascal@15188 446 addw %dx,%cx # next sector
pascal@15188 447 movw %cx, %gs
pascal@15188 448 movw %es, %cx
pascal@15188 449 pushw %dx
pascal@15188 450 shlw $5, %dx
pascal@15188 451 addw %dx, %cx
pascal@15188 452 popw %dx
pascal@15188 453 subw %dx,%di # update sector counter
pascal@15188 454 popw %dx
pascal@15188 455 #else
pascal@15188 456 addw %ax,%cx # next sector
pascal@15188 457 movw %cx, %gs
pascal@15188 458 movw %es, %cx
pascal@15188 459 pushw %ax
pascal@15188 460 shlw $5, %ax
pascal@15188 461 addw %ax, %cx
pascal@15188 462 popw %ax
pascal@15188 463 subw %ax,%di # update sector counter
pascal@19941 464 #endif
pascal@15188 465 read_sectorsCX:
pascal@15188 466 movw %cx, %es # next location
pascal@19941 467 jz return
pascal@15188 468 read_sectors:
pascal@15188 469 movw %gs, %cx
pascal@15188 470 #ifndef FLOPPY_1440K_ONLY
pascal@15188 471 # al is last sector+1
pascal@15188 472 # ah is last cylinder+1
pascal@15188 473 xchgw %ax, %bp
pascal@15188 474 #endif
pascal@15188 475 #ifndef FLOPPY_1440K_ONLY
pascal@15188 476 cmpb %al,%cl # reach sector limit ?
pascal@15188 477 jne bdendlp
pascal@15188 478 next_head:
pascal@15188 479 movb %cl,%al
pascal@15188 480 #else
pascal@15188 481 cmpb $FLOPPY_SECTORS+1,%cl # reach sector limit ?
pascal@15188 482 jne bdendlp
pascal@15188 483 #endif
pascal@19941 484 movb $1,%cl # first sector
pascal@19941 485 #ifndef FLOPPY_HAS_2_SIDES
pascal@15188 486 incb %dh # next head
pascal@15188 487 cmpb %ah, %dh # reach head limit ?
pascal@15188 488 jne bdendlp
pascal@15188 489 next_cylinder:
pascal@15188 490 movb %dh,%ah
pascal@19941 491 movb $0,%dh # first head
pascal@15188 492 #else
pascal@19941 493 xorb %cl,%dh # next head
pascal@19941 494 jne bdendlp # reach head limit ?
pascal@15188 495 #endif
pascal@15188 496 # NOTE : support 256 cylinders max
pascal@15188 497 incb %ch # next cylinder
pascal@15188 498 read_first_sectors:
pascal@15188 499 bdendlp:
pascal@15188 500 jmp read_sectorslp
pascal@15188 501
pascal@19941 502 #ifdef VCPI
pascal@19941 503 pagebuf = 0x98000
pascal@19920 504 tss = gdt_abs-40
pascal@19920 505 gdt = gdt_abs-32
pascal@19920 506 gdt_null = gdt_abs-32
pascal@19920 507 gdt_vcpi = gdt_abs-24
pascal@19920 508 gdt_vcpi2 = gdt_abs-16
pascal@19920 509 gdt_vcpi3 = gdt_abs-8
pascal@19920 510 gdt_abs:
pascal@19941 511 .word 0xFFFF
pascal@19941 512 .long 0x92000000
pascal@19941 513 .byte 0xCF,0
pascal@19920 514 gdt_code:
pascal@19920 515 .word 0xFFFF
pascal@19920 516 gdt_code_base:
pascal@19941 517 .long 0x9A000000+FLAT20(0)
pascal@19920 518 .byte 0x8F,0
pascal@19920 519 gdt_tss:
pascal@19920 520 .word 0x00FF
pascal@19920 521 gdt_tss_base:
pascal@19941 522 .long 0x89000000+FLAT20(tss)
pascal@19920 523 .byte 0,0
pascal@19920 524 gdtr:
pascal@19920 525 gdt_lim:
pascal@19920 526 .word 0xFFFF
pascal@19920 527 gdt_base:
pascal@19941 528 .long FLAT20(gdt)
pascal@19920 529 sw2pm_params:
pascal@19920 530 sw2pm_cr3:
pascal@19920 531 .long pagebuf+0x1000
pascal@19920 532 sw2pm_gdtr_ptr:
pascal@19941 533 .long FLAT20(gdtr)
pascal@19920 534 sw2pm_idtr_ptr:
pascal@19941 535 .long FLAT20(idtr)
pascal@19920 536 sw2pm_ldtr:
pascal@19920 537 .word 0
pascal@19920 538 sw2pm_tr:
pascal@19920 539 SEL_TSS = gdt_tss-gdt_null
pascal@19920 540 .word SEL_TSS
pascal@19920 541 sw2pm_jumpaddr:
pascal@19941 542 .long pm_code
pascal@19920 543 SEL_CODE = gdt_code-gdt_null
pascal@19920 544 .word SEL_CODE
pascal@19920 545 idtr:
pascal@19920 546 idt_lim:
pascal@19920 547 .word 0x03FF
pascal@19920 548 idt_base:
pascal@19920 549 .long 0
pascal@19941 550 # ifndef SHUTDOWNDOS
pascal@19941 551 saved_ss_sp:
pascal@19941 552 .word stacktop-4-16-4,INITSEG
pascal@19941 553 # endif
pascal@19920 554 #endif