wok annotate memtest/stuff/bootloader.S @ rev 19920

memtest: VCPI support
author Pascal Bellard <pascal.bellard@slitaz.org>
date Wed Apr 19 22:14:58 2017 +0200 (2017-04-19)
parents 67179a0300fd
children 9e463ebef079
rev   line source
pascal@15188 1 SYSSEG = 0x1000
pascal@15188 2 INITSEG = 0x9000
pascal@15188 3 SETUPSEG = 0x9020
pascal@15188 4
pascal@15188 5 .text
pascal@15188 6 .code16
pascal@15188 7 .org 0
pascal@15188 8 .globl _start
pascal@15188 9 _start:
pascal@15188 10
pascal@19399 11 #define CODESZ 512 /* patched by installer */
pascal@15188 12
pascal@15188 13 /* some extra features */
pascal@15188 14 #define EXE_SUPPORT real mode dos .exe file support
pascal@15188 15 #define CMDLINE 0x9E00
pascal@15188 16 #define HELP store help message for /? argument
pascal@19920 17 #define TINYSYSTEM the full file in one segment
pascal@19920 18 #define CHECK_CPU need a 386+
pascal@19920 19 #define VM2RM (0x3C+0x19B)
pascal@19399 20 #define SHUTDOWNDOS shutdown DOS services
pascal@15188 21
pascal@15188 22 /* some contraints to reduce the size */
pascal@15188 23 //#define FLOPPY_1440K_ONLY 1.44M floppies support only
pascal@15188 24 #define NO_CURSOR_DEFINITION
pascal@15188 25
pascal@15188 26 #ifdef EXE_SUPPORT
pascal@19399 27 #define EXEADRS(x) (x+0xE0)
pascal@15188 28 stacktop = 0x9E00 # in 0x8000 .. 0xA000
pascal@15188 29 decw %bp // Magic number: MZ
pascal@15188 30 popw %dx
pascal@19920 31 jmp startz // Bytes on last page of file
pascal@15188 32 .word (CODESZ+511)/512 // Pages in file
pascal@15188 33 .word 0 // Relocations
pascal@15188 34 .word (end_header-_start)/16 // Size of header in paragraphs
pascal@15188 35 .word 4096 // Minimum extra paragraphs needed
pascal@15188 36 .word -1 // Maximum extra paragraphs needed
pascal@15188 37 .word (CODESZ+15)/16 // Initial (relative) SS value
pascal@15188 38 .word stacktop // Initial SP value
pascal@15188 39 .word 0 // Checksum
pascal@15188 40 .word EXEADRS(comstart) // Initial IP value
pascal@15188 41 .word 0xFFF0 // Initial (relative) CS value
pascal@15188 42 // .word 0x001C // File address of relocation table
pascal@15188 43 // .word 0,0,0 // Overlay number
pascal@19920 44 .ascii "SliTaz"
pascal@19920 45 startz:
pascal@19920 46 jmp start
pascal@15188 47 end_header:
pascal@15188 48 comstart:
pascal@15470 49 cld # assume nothing
pascal@15188 50 #ifdef CMDLINE
pascal@19401 51 movw $stacktop, %di # cmdline offset at 0x22
pascal@15471 52 #else
pascal@15188 53 #undef HELP
pascal@15188 54 #endif
pascal@15188 55 pushw $INITSEG
pascal@15188 56 popw %es
pascal@15188 57 #ifdef CMDLINE
pascal@15188 58 movw $0x80, %si
pascal@15188 59 lodsb
pascal@15188 60 cbw
pascal@15188 61 xchgw %ax, %cx
pascal@15188 62 jcxz nocmdline
pascal@15470 63 movw $0xA33F, 0x7F(%si)
pascal@15188 64 skipspace:
pascal@15188 65 lodsb
pascal@15188 66 cmpb $0x20, %al
pascal@15188 67 je skipspace
pascal@15188 68 decw %si
pascal@15188 69 rep
pascal@15188 70 movsb
pascal@15188 71 # ifdef HELP
pascal@15188 72 # define PUTS
pascal@15188 73 movw $EXEADRS(helpmsg), %si
pascal@15485 74 cmpb $'/'+1, %al
pascal@19920 75 # ifdef CHECK_CPU
pascal@15485 76 js jsputs
pascal@15476 77 # else
pascal@15485 78 js puts
pascal@15476 79 # endif
pascal@15188 80 # endif
pascal@15188 81 nocmdline:
pascal@15188 82 #endif
pascal@15472 83 movw $SYSSEG, %ax
pascal@19400 84 movb $(512-(end_header-_start))/2, %cl
pascal@19400 85 movw $end_header, %di
pascal@19920 86 #ifdef CHECK_CPU
pascal@15188 87 #define PUTS
pascal@15188 88 movw $EXEADRS(realmode_expected), %si
pascal@19400 89 //movb setup_sects-realmode_expected(%si), %ch
pascal@19400 90 .byte 0x8A, 0x6C, setup_sects-realmode_expected
pascal@15188 91 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
pascal@15188 92 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
pascal@15472 93 //movb $0x10, %ah // DF = IF = TF = 0
pascal@15188 94 pushw %ax
pascal@15188 95 popfw // < 286 : flags[12..15] are forced 1
pascal@15188 96 pushfw // = 286 : flags[12..15] are forced 0
pascal@15469 97 popw %dx // > 286 : only flags[15] is forced 0
pascal@19401 98 cmpb %ah, %dh // test Fx and 0x cases: S= < 386, C= < 286
pascal@15485 99 jsputs:
pascal@15485 100 js puts // S= not 386+
pascal@15472 101 smsww %dx
pascal@15472 102 shrw $1, %dx
pascal@19920 103 # ifdef VM2RM
pascal@19920 104 jnc isrm
pascal@19920 105 push %cs
pascal@19920 106 call VM2RM
pascal@19920 107 isrm:
pascal@19920 108 # else
pascal@19401 109 jc puts // protected mode: vm86
pascal@19920 110 # endif
pascal@17223 111 #else
pascal@17223 112 movb EXEADRS(setup_sects), %ch
pascal@15188 113 #endif
pascal@15188 114 movw $0x100, %si
pascal@15188 115 rep
pascal@15188 116 movsw
pascal@19400 117 movw %ds, %bx
pascal@19401 118 pushw %es
pascal@19401 119 popw %ss
pascal@19399 120 #ifndef SHUTDOWNDOS
pascal@15188 121 ljmp $INITSEG, $movesys
pascal@19399 122 #else
pascal@19399 123 pushaw
pascal@19400 124 movw %cx, %ds # %ds = 0
pascal@19400 125 movw $4, %si
pascal@19400 126 pushl (%si)
pascal@19400 127 movw $step19, (%si)
pascal@19400 128 movw %es, 2(%si)
pascal@19399 129 pushfw
pascal@19399 130 popw %ax
pascal@19399 131 incb %ah # set TF
pascal@19399 132 pushw %ax
pascal@19399 133 popfw
pascal@19400 134 ljmp *4*0x19-4(%si)
pascal@19399 135 #endif
pascal@15188 136 start:
pascal@15188 137 pushw %dx
pascal@15188 138 #else
pascal@15188 139 #undef HELP
pascal@15188 140 #undef CMDLINE
pascal@19920 141 #undef CHECK_CPU
pascal@15188 142 #endif
pascal@15188 143 cld # assume nothing
pascal@15188 144 stacktop = 0x9E00 # in 0x8000 .. 0xA000
pascal@15188 145 zeroed = 12 # zeroed registers
pascal@15188 146 movw $stacktop-12-zeroed, %di # stacktop is an arbitrary value >=
pascal@15188 147 # length of bootsect + length of
pascal@15188 148 # setup + room for stack;
pascal@15188 149 # 12 is disk parm size.
pascal@15188 150 pushw $INITSEG
pascal@15188 151 popw %ss # %ss contain INITSEG
pascal@15188 152 movw %di, %sp # put stack at INITSEG:stacktop-...
pascal@15188 153
pascal@15188 154 # Many BIOS's default disk parameter tables will not recognize
pascal@15188 155 # multi-sector reads beyond the maximum sector number specified
pascal@15188 156 # in the default diskette parameter tables - this may mean 7
pascal@15188 157 # sectors in some cases.
pascal@15188 158 #
pascal@15188 159 # Since single sector reads are slow and out of the question,
pascal@15188 160 # we must take care of this by creating new parameter tables
pascal@15188 161 # (for the first disk) in RAM. We can set the maximum sector
pascal@15188 162 # count to 36 - the most we will encounter on an ED 2.88.
pascal@15188 163 #
pascal@15188 164 # High doesn't hurt. Low does. Let's use the max: 63
pascal@15188 165
pascal@15188 166 pushw %ss
pascal@15188 167 popw %es # %es = %ss = INITSEG
pascal@15188 168 xorw %ax, %ax # %ax = 0
pascal@15472 169 #ifdef EXE_SUPPORT
pascal@15472 170 cwd # %dx = 0
pascal@15472 171 #endif
pascal@15188 172 movw $zeroed/2, %cx # clear gdt + offset, %ds, limits
pascal@15188 173 rep # don't worry about cld
pascal@15188 174 stosw # already done above
pascal@15188 175 popw %bx # offset = 0
pascal@15188 176 popw %ds # %ds = 0
pascal@15188 177 popw %fs # %fs = 0
pascal@15188 178
pascal@15188 179 movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0)
pascal@15188 180 incw %ax
pascal@15188 181
pascal@15188 182 ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address
pascal@15188 183 pushw %es
pascal@15188 184 pushw %di
pascal@15188 185 movb $6, %cl # copy 12 bytes
pascal@15188 186 rep # don't worry about cld
pascal@15188 187 movsw # already done above
pascal@15188 188 pushw %ss
pascal@15188 189 popw %ds # now %ds = %es = %ss = INITSEG
pascal@15188 190 popl %fs:0x78(%bx) # update parameter table address
pascal@15188 191 movb $63, 0x4-12(%di) # patch sector count, %di = stacktop
pascal@15188 192 cli
pascal@15188 193
pascal@15188 194 xchg %ax, %di # sector count
pascal@15188 195 popw %ax # limits = 0
pascal@15188 196 incw %cx # cylinder 0, sector 1, clear Z
pascal@15188 197 call read_first_sectors # read setup
pascal@15188 198
pascal@15188 199 # This routine loads the system at address LOADSEG, making sure
pascal@15188 200 # no 64kB boundaries are crossed. We try to load it as fast as
pascal@15188 201 # possible, loading whole tracks whenever we can.
pascal@15188 202
pascal@15188 203 popw %bx # clear %bx
pascal@15188 204 movw syssize, %di
pascal@17223 205 decw %di
pascal@15188 206 shrw $9-4, %di
pascal@17223 207 incw %di
pascal@15188 208 movw $SYSSEG, %cx
pascal@15188 209 call read_sectorsCX
pascal@15188 210
pascal@15188 211 # This procedure turns off the floppy drive motor, so
pascal@15188 212 # that we enter the kernel in a known state, and
pascal@15188 213 # don't have to worry about it later.
pascal@15188 214
pascal@15188 215 kill_motor:
pascal@15188 216 xchgw %ax, %di # reset FDC (%di < 128)
pascal@15188 217 int $0x13
pascal@15188 218
pascal@15188 219 # After that (everything loaded), we jump to the setup-routine
pascal@15188 220 # loaded directly after the bootblock:
pascal@15188 221 # Segments are as follows: %ds = %ss = INITSEG
pascal@15188 222
pascal@15188 223 jmp_setup:
pascal@15188 224 ljmp $SETUPSEG, $0
pascal@15188 225
pascal@15188 226 #ifdef PUTS
pascal@15188 227 #define PUTC
pascal@15472 228 putslp:
pascal@15472 229 call putc
pascal@15188 230 puts:
pascal@15188 231 lodsb
pascal@15188 232 orb %al, %al
pascal@15472 233 jne putslp
pascal@15480 234 int $0x20 // dos exit
pascal@15188 235 #endif
pascal@15188 236 #ifdef EXE_SUPPORT
pascal@19399 237 #ifdef SHUTDOWNDOS
pascal@19399 238 doiret:
pascal@19399 239 iret
pascal@19399 240 step19:
pascal@19399 241 pushw %si
pascal@19399 242 pushw %ds
pascal@19399 243 movw %sp, %si
pascal@19399 244 ldsw %ss:4(%si), %si
pascal@19399 245 cmpw $0x19CD, (%si)
pascal@19399 246 popw %ds
pascal@19399 247 popw %si
pascal@19399 248 jne doiret
pascal@19399 249 xorw %si, %si
pascal@19402 250 movw %si, %ds
pascal@19401 251 pushw %cs
pascal@19401 252 popw %ss
pascal@19400 253 movw $stacktop-4-16, %sp
pascal@19399 254 popl 4(%si)
pascal@19399 255 popaw
pascal@19399 256 #endif
pascal@17223 257 movesys: // %ax = SYSSEG
pascal@19920 258 #ifdef TINYSYSTEM
pascal@19920 259 movw %si, %cx
pascal@19920 260 negw %cx
pascal@19920 261 xorw %di, %di
pascal@19920 262 movw %ax, %es
pascal@19920 263 movw %si, %dx
pascal@19920 264 shrw $4, %dx
pascal@19920 265 # ifdef SHUTDOWNDOS
pascal@19920 266 movw %bx, %ds
pascal@19920 267 # endif
pascal@19920 268 addw %dx, %bx
pascal@19920 269 subw %ax, %bx
pascal@19920 270 jnc forward
pascal@19920 271 addw %cx, %di
pascal@19920 272 addw %cx, %si
pascal@19920 273 incw %cx
pascal@19920 274 std
pascal@19920 275 forward:
pascal@19920 276 rep
pascal@19920 277 movsb
pascal@19920 278 cld
pascal@19920 279 #else
pascal@19401 280 movw %cs:syssize, %bp
pascal@19193 281 shrw $4, %si
pascal@19193 282 addw %si, %bx
pascal@17223 283 subw %ax, %bx
pascal@15188 284 jnc forward
pascal@15188 285 addw %bp, %ax
pascal@15188 286 forward:
pascal@15188 287 movw %ax, %es
pascal@17223 288 movw %ax, %dx
pascal@17223 289 addw %bx, %dx
pascal@17223 290 movw %dx, %ds
pascal@17223 291 sbbw %dx, %dx // %dx = 0 : -1
pascal@17223 292 cmc // C = 1 : 0
pascal@17223 293 adcw %dx, %ax
pascal@19193 294 xorw %si, %si
pascal@15188 295 xorw %di, %di
pascal@15188 296 movb $8, %cl
pascal@15188 297 rep
pascal@15188 298 movsw
pascal@15188 299 decw %bp
pascal@15188 300 jns forward
pascal@19920 301 #endif
pascal@15188 302 #ifndef NO_CURSOR_DEFINITION
pascal@15188 303 movb $1, %ah
pascal@15188 304 movb $0, %bh
pascal@15188 305 movb $0x20, %ch // 0x2000
pascal@15188 306 int $0x10
pascal@15188 307 #endif
pascal@15188 308 pushw %ss
pascal@15188 309 popw %ds
pascal@15188 310 jmp jmp_setup
pascal@15188 311 #endif
pascal@15188 312 putcdot:
pascal@15188 313 #ifdef PUTC
pascal@15188 314 movb $0x2E, %al
pascal@15188 315 putc:
pascal@15188 316 movb $0xE, %ah
pascal@15188 317 movw $7, %bx
pascal@15188 318 int $0x10
pascal@15188 319 #endif
pascal@15188 320 ret
pascal@15188 321
pascal@15188 322
pascal@15188 323 # read_sectors reads %di sectors into %es:0 buffer.
pascal@15188 324 # %es:0 is updated to the next memory location.
pascal@15188 325 # First, sectors are read sector by sector until
pascal@15188 326 # sector per track count is known. Then they are
pascal@15188 327 # read track by track.
pascal@15188 328 # Assume no error on first track.
pascal@15188 329
pascal@15188 330 #ifdef FLOPPY_1440K_ONLY
pascal@15188 331 #define FLOPPY_HEADS 2 /* 2 heads */
pascal@15188 332 #define FLOPPY_SECTORS 18 /* 18 sectors */
pascal@15188 333 #else
pascal@15188 334 #define FLOPPY_HEADS 2 /* 2 heads minimum */
pascal@15188 335 #define FLOPPY_SECTORS 9 /* 9 sectors minimum */
pascal@15188 336 #endif
pascal@15188 337
pascal@15188 338 check_limits:
pascal@15188 339 #ifndef FLOPPY_1440K_ONLY
pascal@15188 340 popw %dx
pascal@15188 341 #ifdef FLOPPY_SECTORS
pascal@15188 342 cmpb $FLOPPY_SECTORS+1, %cl # minimum sector count
pascal@15188 343 jb check_head
pascal@15188 344 #endif
pascal@15188 345 cmpb %al, %cl # max sector known ?
pascal@15188 346 ja next_head # no -> store it
pascal@15188 347 check_head:
pascal@15188 348 #ifdef FLOPPY_HEADS
pascal@15188 349 cmpb $FLOPPY_HEADS, %dh # 2 heads minimum
pascal@15188 350 jb check_cylinder
pascal@15188 351 #endif
pascal@15188 352 cmpb %ah, %dh # max head known ?
pascal@15188 353 ja next_cylinder # no -> store it
pascal@15188 354 check_cylinder:
pascal@15188 355 #endif
pascal@15188 356 pushaw
pascal@15188 357 #ifndef FLOPPY_1440K_ONLY
pascal@15188 358 cbw # %ah = 0
pascal@15188 359 #endif
pascal@15188 360 int $0x13 # reset controler
pascal@15188 361 popaw
pascal@15188 362 movb $1, %al # sector by sector...
pascal@15188 363 read_sectorslp:
pascal@15188 364 pushw %dx # some bios break dx...
pascal@15188 365 #ifndef FLOPPY_1440K_ONLY
pascal@15188 366 pushw %ax # limits
pascal@15188 367 subb %cl, %al # sectors remaining in track
pascal@15188 368 ja tolastsect
pascal@15188 369 movb $1, %al # 1 sector mini
pascal@15188 370 tolastsect:
pascal@15188 371 #else
pascal@19402 372 movb $FLOPPY_SECTORS+1, %al
pascal@15188 373 subb %cl, %al # sectors remaining in track
pascal@15188 374 #endif
pascal@15188 375 cbw
pascal@15188 376 cmpw %di, %ax
pascal@15188 377 jb more1trk
pascal@15188 378 movw %di, %ax # sectors to read
pascal@15188 379 more1trk:
pascal@15188 380 pushw %ax # save context
pascal@15188 381 movb $2, %ah # cmd: read chs
pascal@15188 382 int $0x13
pascal@15188 383 #ifndef FLOPPY_1440K_ONLY
pascal@15188 384 popw %dx # save %ax
pascal@15188 385 popw %ax # limits
pascal@15188 386 #else
pascal@15188 387 popw %ax # restore context
pascal@15188 388 popw %dx
pascal@15188 389 #endif
pascal@15188 390 jc check_limits
pascal@15188 391 #ifndef FLOPPY_1440K_ONLY
pascal@15188 392 xchgw %ax, %bp
pascal@15188 393 addw %dx,%cx # next sector
pascal@15188 394 movw %cx, %gs
pascal@15188 395 movw %es, %cx
pascal@15188 396 pushw %dx
pascal@15188 397 shlw $5, %dx
pascal@15188 398 addw %dx, %cx
pascal@15188 399 popw %dx
pascal@15188 400 subw %dx,%di # update sector counter
pascal@15188 401 popw %dx
pascal@15188 402 read_sectorsCX:
pascal@15188 403 movw %cx, %es # next location
pascal@15188 404 jz putcdot
pascal@15188 405 #else
pascal@15188 406 addw %ax,%cx # next sector
pascal@15188 407 movw %cx, %gs
pascal@15188 408 movw %es, %cx
pascal@15188 409 pushw %ax
pascal@15188 410 shlw $5, %ax
pascal@15188 411 addw %ax, %cx
pascal@15188 412 popw %ax
pascal@15188 413 subw %ax,%di # update sector counter
pascal@15188 414 read_sectorsCX:
pascal@15188 415 movw %cx, %es # next location
pascal@15188 416 jz putcdot
pascal@15188 417 #endif
pascal@15188 418 read_sectors:
pascal@15188 419 movw %gs, %cx
pascal@15188 420 #ifndef FLOPPY_1440K_ONLY
pascal@15188 421 # al is last sector+1
pascal@15188 422 # ah is last cylinder+1
pascal@15188 423 xchgw %ax, %bp
pascal@15188 424 #endif
pascal@15188 425 #ifndef FLOPPY_1440K_ONLY
pascal@15188 426 cmpb %al,%cl # reach sector limit ?
pascal@15188 427 jne bdendlp
pascal@15188 428 next_head:
pascal@15188 429 movb %cl,%al
pascal@15188 430 #else
pascal@15188 431 cmpb $FLOPPY_SECTORS+1,%cl # reach sector limit ?
pascal@15188 432 jne bdendlp
pascal@15188 433 #endif
pascal@15188 434 incb %dh # next head
pascal@15188 435 movb $1,%cl # first sector
pascal@15188 436 #ifndef FLOPPY_1440K_ONLY
pascal@15188 437 cmpb %ah, %dh # reach head limit ?
pascal@15188 438 jne bdendlp
pascal@15188 439 next_cylinder:
pascal@15188 440 movb %dh,%ah
pascal@15188 441 #else
pascal@15188 442 cmpb %cl,%dh # reach head limit ?
pascal@15188 443 je bdendlp
pascal@15188 444 #endif
pascal@15188 445 # NOTE : support 256 cylinders max
pascal@15188 446 incb %ch # next cylinder
pascal@18880 447 movb $0,%dh # first head
pascal@15188 448 read_first_sectors:
pascal@15188 449 bdendlp:
pascal@15188 450 jmp read_sectorslp
pascal@15188 451
pascal@19920 452 #ifdef VM2RM
pascal@19920 453 pagebuf = 0x96000
pascal@19920 454 saved_ss_sp = gdt_abs-44
pascal@19920 455 saved_sp = gdt_abs-44
pascal@19920 456 saved_ss = gdt_abs-42
pascal@19920 457 tss = gdt_abs-40
pascal@19920 458 gdt = gdt_abs-32
pascal@19920 459 gdt_null = gdt_abs-32
pascal@19920 460 gdt_vcpi = gdt_abs-24
pascal@19920 461 gdt_vcpi2 = gdt_abs-16
pascal@19920 462 gdt_vcpi3 = gdt_abs-8
pascal@19920 463 gdt_abs:
pascal@19920 464 .word 0xFFFF,0
pascal@19920 465 .byte 0,0x92,0xCF,0
pascal@19920 466 gdt_code:
pascal@19920 467 .word 0xFFFF
pascal@19920 468 gdt_code_base:
pascal@19920 469 .long 0x9A000000
pascal@19920 470 .byte 0x8F,0
pascal@19920 471 gdt_tss:
pascal@19920 472 .word 0x00FF
pascal@19920 473 gdt_tss_base:
pascal@19920 474 .long 0x89000000+EXEADRS(tss)
pascal@19920 475 .byte 0,0
pascal@19920 476 gdtr:
pascal@19920 477 gdt_lim:
pascal@19920 478 .word 0xFFFF
pascal@19920 479 gdt_base:
pascal@19920 480 .long EXEADRS(gdt)
pascal@19920 481 sw2pm_params:
pascal@19920 482 sw2pm_cr3:
pascal@19920 483 .long pagebuf+0x1000
pascal@19920 484 sw2pm_gdtr_ptr:
pascal@19920 485 .long EXEADRS(gdtr)
pascal@19920 486 sw2pm_idtr_ptr:
pascal@19920 487 .long EXEADRS(idtr)
pascal@19920 488 sw2pm_ldtr:
pascal@19920 489 .word 0
pascal@19920 490 sw2pm_tr:
pascal@19920 491 SEL_TSS = gdt_tss-gdt_null
pascal@19920 492 .word SEL_TSS
pascal@19920 493 sw2pm_jumpaddr:
pascal@19920 494 #define SETUPEXEADRS(x) (x+0x2E0)
pascal@19920 495 pm_code = 0x0084
pascal@19920 496 .long SETUPEXEADRS(pm_code)
pascal@19920 497 SEL_CODE = gdt_code-gdt_null
pascal@19920 498 .word SEL_CODE
pascal@19920 499 idtr:
pascal@19920 500 idt_lim:
pascal@19920 501 .word 0x03FF
pascal@19920 502 idt_base:
pascal@19920 503 .long 0
pascal@19920 504 #endif
pascal@15188 505 #ifdef HELP
pascal@15188 506 helpmsg:
pascal@19920 507 .ascii "No help."
pascal@15188 508 .byte 13,10
pascal@15188 509 .byte 0
pascal@15188 510 #endif
pascal@19920 511 #ifdef CHECK_CPU
pascal@19920 512 # if VM2RM
pascal@19920 513 .org 484
pascal@19920 514 realmode_expected:
pascal@19920 515 helpend:
pascal@19920 516 .ascii "386+ only."
pascal@19920 517 # else
pascal@17223 518 .org 475
pascal@17223 519 realmode_expected:
pascal@17223 520 helpend:
pascal@17223 521 .ascii "386 real mode only."
pascal@19920 522 # endif
pascal@17223 523 .byte 13,10,0
pascal@17223 524 #endif
pascal@15188 525 .org 497
pascal@17223 526 setup_sects:
pascal@17223 527 .byte 0
pascal@17223 528 .org 500
pascal@17223 529 syssize:
pascal@17223 530 .word 0
pascal@17223 531