wok-current annotate syslinux/stuff/iso2exe/bootloader.S @ rev 18140

syslinux/taziso: add floppyset
author Pascal Bellard <pascal.bellard@slitaz.org>
date Mon Jun 15 16:28:54 2015 +0200 (2015-06-15)
parents
children 83694a75d225
rev   line source
pascal@18140 1 BOOTSEG = 0x07C0 /* original address of boot-sector */
pascal@18140 2 SYSSEG = 0x1000 /* historical load address >> 4 */
pascal@18140 3 INITSEG = 0x9000 /* boot address >> 4 */
pascal@18140 4 SETUPSEG = 0x9020 /* setup address >> 4 */
pascal@18140 5 ASK_VGA = -3
pascal@18140 6
pascal@18140 7 #ifndef SVGA_MODE
pascal@18140 8 #define SVGA_MODE ASK_VGA
pascal@18140 9 #endif
pascal@18140 10
pascal@18140 11 #ifndef RAMDISK
pascal@18140 12 #define RAMDISK 0
pascal@18140 13 #endif
pascal@18140 14
pascal@18140 15 #ifndef ROOT_RDONLY
pascal@18140 16 #define ROOT_RDONLY 1
pascal@18140 17 #endif
pascal@18140 18
pascal@18140 19 /* some extra features */
pascal@18140 20 #define CMDLINE kernel >= 2.4
pascal@18140 21 #define OLDCMDLINE kernel < 2.4
pascal@18140 22 #define HELP display version for ? argument
pascal@18140 23 #define MORETHAN16M up to 4Gb RAM, not 16Mb
pascal@18140 24 #define KEYBOARDLESS_SUPPORT scan floppy swap each 5 seconds
pascal@18140 25
pascal@18140 26 #define EDIT_CMDLINE
pascal@18140 27 #define CMDLINE_SUPPORT
pascal@18140 28 #define MOVE_CMDLINE
pascal@18140 29 #define INITRD_SUPPORT
pascal@18140 30 #define INITRD_AUTOADDR
pascal@18140 31 #define MULTI_INITRD many in one support
pascal@18140 32
pascal@18140 33 .code16
pascal@18140 34 .org 0
pascal@18140 35
pascal@18140 36 bootsect_start:
pascal@18140 37
pascal@18140 38 cur_initrd_size_ofs = 494
pascal@18140 39 ramdisk_image_ofs = 0x218
pascal@18140 40 ramdisk_image = bootsect_start+ramdisk_image_ofs
pascal@18140 41 ramdisk_size_ofs = 0x21C
pascal@18140 42 ramdisk_size = bootsect_start+ramdisk_size_ofs
pascal@18140 43 cmd_line_ptr_ofs = 0x228
pascal@18140 44 cmd_line_ptr = bootsect_start+cmd_line_ptr_ofs
pascal@18140 45 setup_sects = bootsect_start+497
pascal@18140 46 syssize = bootsect_start+500
pascal@18140 47 boot_flag_ofs = 510
pascal@18140 48 boot_flag = bootsect_start+boot_flag_ofs
pascal@18140 49
pascal@18140 50
pascal@18140 51 stacktop = 0x9E00 # in 0x8000 .. 0xA000
pascal@18140 52 zeroed = 48+10 # gdt + zeroed registers
pascal@18140 53 .macro INIT_REGS
pascal@18140 54 movw $stacktop-zeroed, %di # stacktop is an arbitrary value >=
pascal@18140 55 # length of bootsect + length of
pascal@18140 56 # setup + room for stack;
pascal@18140 57 # 12 is disk parm size.
pascal@18140 58 pushw $INITSEG
pascal@18140 59 popw %ss # %ss contain INITSEG
pascal@18140 60 movw %di, %sp # put stack at INITSEG:stacktop-...
pascal@18140 61 pushw %ss
pascal@18140 62 popw %es # %es = %ss = INITSEG
pascal@18140 63 xorw %ax, %ax # %ax = 0
pascal@18140 64 #if defined(CMDLINE)
pascal@18140 65 movw $zeroed+1, %cx # clear gdt + offset, %ds, limits, cmdline=""
pascal@18140 66 rep # don't worry about cld
pascal@18140 67 stosb # already done above
pascal@18140 68 decw %di
pascal@18140 69 #else
pascal@18140 70 movw $zeroed/2, %cx # clear gdt + offset, %ds, limits
pascal@18140 71 rep # don't worry about cld
pascal@18140 72 stosw # already done above
pascal@18140 73 #endif
pascal@18140 74 popw %bx # offset = 0
pascal@18140 75 .endm
pascal@18140 76
pascal@18140 77 LOADSEG = 0x8000 # 0x1000 multiple, up to 512K zImage
pascal@18140 78 LOADSZ = 0x10000
pascal@18140 79
pascal@18140 80 # bootsect_start:
pascal@18140 81 INIT_REGS
pascal@18140 82 popw %ds # %ds = 0
pascal@18140 83 movb setup_sects+0x7C00, %al # read bootsector + setup
pascal@18140 84 incw %ax # %ax = setup_sects+bootsect
pascal@18140 85 popw %fs # %fs = 0
pascal@18140 86
pascal@18140 87 # Many BIOS's default disk parameter tables will not recognize
pascal@18140 88 # multi-sector reads beyond the maximum sector number specified
pascal@18140 89 # in the default diskette parameter tables - this may mean 7
pascal@18140 90 # sectors in some cases.
pascal@18140 91 #
pascal@18140 92 # Since single sector reads are slow and out of the question,
pascal@18140 93 # we must take care of this by creating new parameter tables
pascal@18140 94 # (for the first disk) in RAM. We can set the maximum sector
pascal@18140 95 # count to 36 - the most we will encounter on an ED 2.88.
pascal@18140 96 #
pascal@18140 97 # High doesn't hurt. Low does. Let's use the max: 63
pascal@18140 98
pascal@18140 99 ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address
pascal@18140 100 popw %di
pascal@18140 101 pushw %es
pascal@18140 102 pushw %di
pascal@18140 103 #ifdef CMDLINE_SUPPORT
pascal@18140 104 movw $0, %bp # patched by installer (7C22)
pascal@18140 105 skipcmdline:
pascal@18140 106 #define cmd_line_ptr 0x22
pascal@18140 107 #endif
pascal@18140 108 movb $6, %cl # copy 12 bytes
pascal@18140 109 rep # don't worry about cld
pascal@18140 110 movsw # already done above
pascal@18140 111 pushw %ss
pascal@18140 112 popw %ds # now %ds = %es = %ss = INITSEG
pascal@18140 113 popl %fs:0x78(%bx) # update parameter table address
pascal@18140 114 movb $63, 0x4-12(%di) # patch sector count, %di = stacktop
pascal@18140 115 cli
pascal@18140 116
pascal@18140 117 xchg %ax, %di # sector count
pascal@18140 118 popw %ax # limits = 0
pascal@18140 119 incw %cx # cylinder 0, sector 1, clear Z
pascal@18140 120 call read_first_sectors # read setup
pascal@18140 121 loadsys:
pascal@18140 122 movw $0x200,%si
pascal@18140 123 type_of_loader = 0x10
pascal@18140 124 loadflags = 0x11
pascal@18140 125 heap_end_ptr = 0x24
pascal@18140 126 orw $0x8020, type_of_loader(%si) # loader type = 0x20 = bootsect-loader
pascal@18140 127 movb $(stacktop-0x300)/256, heap_end_ptr+1(%si)
pascal@18140 128 call puts_version # show which kernel we are loading
pascal@18140 129
pascal@18140 130 #ifdef CMDLINE_SUPPORT
pascal@18140 131 # The cmdline can be entered and modifed at boot time.
pascal@18140 132 # Only characters before the cursor are passed to the kernel.
pascal@18140 133
pascal@18140 134 xorw %si, %si
pascal@18140 135 orw cmd_line_ptr-7(%bx), %si
pascal@18140 136 jz nocmdline
pascal@18140 137 #ifdef OLDCMDLINE
pascal@18140 138 movw $0xA33F, cmd_line_ptr-2-7(%bx)
pascal@18140 139 #endif
pascal@18140 140 call puts
pascal@18140 141 #if defined(MOVE_CMDLINE) || (defined(EDIT_CMDLINE) && defined(KEYBOARDLESS_SUPPORT))
pascal@18140 142 pushw %di
pascal@18140 143 #endif
pascal@18140 144 #ifdef EDIT_CMDLINE
pascal@18140 145 cmdlp:
pascal@18140 146 movb $0x20, %al # clear end of line
pascal@18140 147 cmdlpz:
pascal@18140 148 call putc # with Space
pascal@18140 149 subb $0x18, %al # and BackSpace
pascal@18140 150 jnc cmdlpz
pascal@18140 151 decw %si
pascal@18140 152 cmdget:
pascal@18140 153 #ifdef KEYBOARDLESS_SUPPORT
pascal@18140 154 call wait4key
pascal@18140 155 #else
pascal@18140 156 int $0x16
pascal@18140 157 #endif
pascal@18140 158 cbw # %ah = 0, get keyboard character
pascal@18140 159 cmpb $8, %al # BackSpace ?
pascal@18140 160 je cmdbs
pascal@18140 161 movb %al, (%si) # store char
pascal@18140 162 lodsw # %si += 2
pascal@18140 163 cmdbs:
pascal@18140 164 cmpw %si, cmd_line_ptr-7(%bx)
pascal@18140 165 je cmdget
pascal@18140 166 call putc
pascal@18140 167 cmpb $10, %al # Enter/linefeed ?
pascal@18140 168 jne cmdlp
pascal@18140 169 movb %bh,-2(%si) # set end of string and remove CR
pascal@18140 170 endcmdline:
pascal@18140 171 #endif
pascal@18140 172 #ifdef MOVE_CMDLINE
pascal@18140 173 pushw %ss
pascal@18140 174 popw %es
pascal@18140 175 movw $0x8000, %di
pascal@18140 176 movw %di, %si
pascal@18140 177 xchgw %si, cmd_line_ptr-7(%bx)
pascal@18140 178 movb $0x2, %ch
pascal@18140 179 rep
pascal@18140 180 movsb
pascal@18140 181 #endif
pascal@18140 182 #if defined(EDIT_CMDLINE) || (defined(MOVE_CMDLINE) && defined(KEYBOARD_TIMEOUT))
pascal@18140 183 popw %di
pascal@18140 184 #endif
pascal@18140 185 nocmdline:
pascal@18140 186 #endif
pascal@18140 187
pascal@18140 188 # This routine loads the system at address LOADSEG, making sure
pascal@18140 189 # no 64kB boundaries are crossed. We try to load it as fast as
pascal@18140 190 # possible, loading whole tracks whenever we can.
pascal@18140 191
pascal@18140 192 .macro autoaddr base
pascal@18140 193 #ifdef INITRD_AUTOADDR
pascal@18140 194 movb $0x88, %ah
pascal@18140 195 int $0x15
pascal@18140 196 //jc NeedMoreRAM # error code 80 or 86
pascal@18140 197 cmpw $0xC000, %ax # more than 49M ?
pascal@18140 198 jb NeedMoreRAM
pascal@18140 199 movb %ch, bootsect_dst_base_hi(%si) # initramfs @ 32M
pascal@18140 200 movb %ch, ramdisk_image_ofs+3-\base
pascal@18140 201 NeedMoreRAM:
pascal@18140 202 #endif
pascal@18140 203 .endm
pascal@18140 204
pascal@18140 205 bootsect_src_limit = 16
pascal@18140 206 bootsect_dst_limit = 24
pascal@18140 207 bootsect_src_base = 18
pascal@18140 208 bootsect_dst_base = 26 # bits 0..23
pascal@18140 209 bootsect_dst_base_hi = 31 # bits 24..31
pascal@18140 210 popw %bx # clear %bx
pascal@18140 211 movw %sp, %si # for bootsect_gdt
pascal@18140 212 init_gdt:
pascal@18140 213 decw bootsect_src_limit(%bx,%si) # max 64Kb
pascal@18140 214 movw $0x9300+(LOADSEG/0x1000), bootsect_src_base+2(%bx,%si)
pascal@18140 215 xorb $bootsect_dst_limit-bootsect_src_limit, %bl
pascal@18140 216 jne init_gdt
pascal@18140 217 #ifdef INITRD_SUPPORT
pascal@18140 218 movw $syssize, %bx
pascal@18140 219 movb $5, %cl
pascal@18140 220 code32_start = 0x214
pascal@18140 221 movw code32_start+1, %ax # destination = 0x00100000 or 0x00010000
pascal@18140 222 initrdlp:
pascal@18140 223 movl (%bx), %ebx
pascal@18140 224 decl %ebx
pascal@18140 225 shrl %cl, %ebx
pascal@18140 226 #else
pascal@18140 227 code32_start = 0x214
pascal@18140 228 movw code32_start+1, %ax # destination = 0x00100000 or 0x00010000
pascal@18140 229 movl syssize, %ebx
pascal@18140 230 decl %ebx
pascal@18140 231 shrl $5, %ebx
pascal@18140 232 #endif
pascal@18140 233 #ifdef MORETHAN16M
pascal@18140 234 incl %ebx
pascal@18140 235 #else
pascal@18140 236 incw %bx
pascal@18140 237 #endif
pascal@18140 238 syslp:
pascal@18140 239 movw %ax, bootsect_dst_base+1(%si)
pascal@18140 240 #ifdef MORETHAN16M
pascal@18140 241 movl $LOADSZ/512, %edi # size in sectors
pascal@18140 242 subl %edi, %ebx
pascal@18140 243 #else
pascal@18140 244 movw $LOADSZ/512, %di # size in sectors
pascal@18140 245 subw %di, %bx
pascal@18140 246 #endif
pascal@18140 247 pushf
pascal@18140 248 jnc not_last
pascal@18140 249 addw %bx, %di
pascal@18140 250 not_last:
pascal@18140 251 #ifdef MULTI_INITRD
pascal@18140 252 pushw %di
pascal@18140 253 #endif
pascal@18140 254 pushw %ax
pascal@18140 255 pushw %bx
pascal@18140 256 pushw %si
pascal@18140 257 xorw %bx,%bx
pascal@18140 258 pushw $LOADSEG
pascal@18140 259 popw %es
pascal@18140 260 patchcall:
pascal@18140 261 call read_sectors # update %bp
pascal@18140 262 popw %si
pascal@18140 263 popw %bx
pascal@18140 264 movw %es, %cx # word count = LOADSZ/2 (= LOADSEG)
pascal@18140 265 movb $0x87, %ah
pascal@18140 266 pushw %ss
pascal@18140 267 popw %es # restore es
pascal@18140 268 int $0x15 # max 16M, maybe more...
pascal@18140 269 popw %ax
pascal@18140 270 #ifdef MULTI_INITRD
pascal@18140 271 popw %di
pascal@18140 272 shlw $1,%di # sectors to pages
pascal@18140 273 addw %di, %ax
pascal@18140 274 #ifdef MORETHAN16M
pascal@18140 275 adcb %cl, bootsect_dst_base_hi(%si) # breaks 16M limit ?
pascal@18140 276 #endif
pascal@18140 277 #else
pascal@18140 278 #ifdef MORETHAN16M
pascal@18140 279 addw $0x100, %ax # next dest (ax+=LOADSZ/256)
pascal@18140 280 adcb %cl, bootsect_dst_base_hi(%si) # breaks 16M limit ?
pascal@18140 281 #else
pascal@18140 282 incb %ah # next dest (ax+=LOADSZ/256)
pascal@18140 283 #endif
pascal@18140 284 #endif
pascal@18140 285 popf
pascal@18140 286 ja syslp
pascal@18140 287 #ifdef INITRD_SUPPORT
pascal@18140 288 initrdlp2:
pascal@18140 289 #ifdef INITRD_AUTOADDR
pascal@18140 290 movw $0x209, %cx
pascal@18140 291 #else
pascal@18140 292 movb $9, %cl
pascal@18140 293 #endif
pascal@18140 294 #ifdef MULTI_INITRD
pascal@18140 295 movw $cur_initrd_size_ofs, %di
pascal@18140 296 movw (%di), %bx
pascal@18140 297 addw $4, (%di)
pascal@18140 298 shrw %cl, boot_flag_ofs-cur_initrd_size_ofs(%di)
pascal@18140 299 je nextInitrd
pascal@18140 300 orw %bx, %bx
pascal@18140 301 je bootit # no initrd
pascal@18140 302 autoaddr cur_initrd_size_ofs(%di)
pascal@18140 303 movw ramdisk_image+1,%ax
pascal@18140 304 jmp initrdlp
pascal@18140 305 nextInitrd:
pascal@18140 306 pushw %bx
pascal@18140 307 movl -4(%bx), %ebx
pascal@18140 308 addl %ebx, ramdisk_size_ofs-cur_initrd_size_ofs(%di)
pascal@18140 309 popw %bx
pascal@18140 310 cmpb 2(%di), %bl
pascal@18140 311 jb initrdlp
pascal@18140 312 #else
pascal@18140 313 movw $ramdisk_size, %bx
pascal@18140 314 autoaddr ramdisk_size_ofs(%bx)
pascal@18140 315 movw ramdisk_image+1,%ax
pascal@18140 316 #ifdef MORETHAN16M
pascal@18140 317 cmpb %cl, ramdisk_image+2-ramdisk_size(%bx)
pascal@18140 318 jb bootit
pascal@18140 319 shrw %cl, boot_flag-ramdisk_size(%bx)
pascal@18140 320 jne initrdlp
pascal@18140 321 #else
pascal@18140 322 cmpw %ax, bootsect_dst_base+1(%si)
pascal@18140 323 jb initrdlp
pascal@18140 324 #endif
pascal@18140 325 #endif
pascal@18140 326 #endif
pascal@18140 327 #ifdef MULTI_INITRD
pascal@18140 328 bootit:
pascal@18140 329 jcxz read_sectorslp
pascal@18140 330 #endif
pascal@18140 331
pascal@18140 332 # This procedure turns off the floppy drive motor, so
pascal@18140 333 # that we enter the kernel in a known state, and
pascal@18140 334 # don't have to worry about it later.
pascal@18140 335
pascal@18140 336 kill_motor:
pascal@18140 337 xchgw %ax, %di # reset FDC (%di < 128)
pascal@18140 338 int $0x13
pascal@18140 339
pascal@18140 340 # After that (everything loaded), we jump to the setup-routine
pascal@18140 341 # loaded directly after the bootblock:
pascal@18140 342 # Segments are as follows: %ds = %ss = INITSEG
pascal@18140 343
pascal@18140 344 ljmp $SETUPSEG, $0
pascal@18140 345
pascal@18140 346 # read_sectors reads %di sectors into %es:0 buffer.
pascal@18140 347 # %es:0 is updated to the next memory location.
pascal@18140 348 # First, sectors are read sector by sector until
pascal@18140 349 # sector per track count is known. Then they are
pascal@18140 350 # read track by track.
pascal@18140 351 # Assume no error on first track.
pascal@18140 352
pascal@18140 353 #define FLOPPY_CYLINDERS 80
pascal@18140 354 #define FLOPPY_HEADS 2
pascal@18140 355
pascal@18140 356 check_limits:
pascal@18140 357 popw %dx
pascal@18140 358 cmpb %al, %cl # max sector known ?
pascal@18140 359 ja next_head # no -> store it
pascal@18140 360 pushaw
pascal@18140 361 int $0x13 # reset controler
pascal@18140 362 stc
pascal@18140 363 call putcdot # print '-'
pascal@18140 364 read_sectorslp:
pascal@18140 365 popaw
pascal@18140 366 bdendlp:
pascal@18140 367 pushw %dx # some bios break dx...
pascal@18140 368 pushw %ax # limits
pascal@18140 369 subb %cl, %al # sectors remaining in track
pascal@18140 370 ja tolastsect
pascal@18140 371 movb $1, %al # 1 sector mini
pascal@18140 372 tolastsect:
pascal@18140 373 cmpw %di, %ax
pascal@18140 374 jb more1trk
pascal@18140 375 movw %di, %ax # sectors to read
pascal@18140 376 more1trk:
pascal@18140 377 pushw %ax # save context
pascal@18140 378 movb $2, %ah # cmd: read chs
pascal@18140 379 int $0x13
pascal@18140 380 popw %dx # save %ax
pascal@18140 381 popw %ax # limits
pascal@18140 382 jc check_limits
pascal@18140 383 xchgw %ax, %bp
pascal@18140 384 addw %dx,%cx # next sector
pascal@18140 385 movw %cx, %gs
pascal@18140 386 addb %dl,%bh
pascal@18140 387 addb %dl,%bh # next location
pascal@18140 388 subw %dx,%di # update sector counter
pascal@18140 389 popw %dx
pascal@18140 390 jz putcdot
pascal@18140 391 read_sectors:
pascal@18140 392 movw %gs, %cx
pascal@18140 393 # al is last sector+1
pascal@18140 394 # ah is 0
pascal@18140 395 xchgw %ax, %bp
pascal@18140 396 cmpb %al,%cl # reach sector limit ?
pascal@18140 397 jne bdendlp
pascal@18140 398 next_head:
pascal@18140 399 movb %cl,%al
pascal@18140 400 movb $1, %cl # first sector
pascal@18140 401 inc_head:
pascal@18140 402 xorb %cl, %dh # next head
pascal@18140 403 jne bdendlp # reach head limit ?
pascal@18140 404 incb %ch # next cylinder
pascal@18140 405 read_first_sectors:
pascal@18140 406 cmpb $FLOPPY_CYLINDERS,%ch # reach cylinder limit ?
pascal@18140 407 jne bdendlp
pascal@18140 408 next_floppy:
pascal@18140 409 movb $0,%ch # first cylinder
pascal@18140 410 pushaw
pascal@18140 411 movw $swap_floppy,%si
pascal@18140 412 #ifdef KEYBOARDLESS_SUPPORT
pascal@18140 413 pushw %bx
pascal@18140 414 call puts
pascal@18140 415 popw %bx
pascal@18140 416 movw %si, %bp
pascal@18140 417 waitfloppy:
pascal@18140 418 call wait
pascal@18140 419 jne waitfloppydone
pascal@18140 420 #ifdef MULTI_INITRD
pascal@18140 421 decb (%si) # max_timeouts
pascal@18140 422 jz gobootit
pascal@18140 423 #endif
pascal@18140 424 pushw %dx # some bios break dx...
pascal@18140 425 cbw
pascal@18140 426 int $0x13 # reset FDC
pascal@18140 427 movw $0x201,%ax
pascal@18140 428 int $0x13 # read first sector
pascal@18140 429 popw %dx
pascal@18140 430 rclb $1,%ah # floppy changed 06=>0D no error 00
pascal@18140 431 cmpb -2(%bp), %ah # 0D then 00
pascal@18140 432 jne waitfloppy # no => try again
pascal@18140 433 incw %bp
pascal@18140 434 decw %ax # was 0001 ?
pascal@18140 435 jne waitfloppy
pascal@18140 436 waitfloppydone:
pascal@18140 437 #else
pascal@18140 438 call puts
pascal@18140 439 cbw # %ah = 0, get keyboard character
pascal@18140 440 int $0x16
pascal@18140 441 #endif
pascal@18140 442 #ifdef MULTI_INITRD
pascal@18140 443 orb $0x20, %al
pascal@18140 444 cmp $'b', %al
pascal@18140 445 jnz read_sectorslp
pascal@18140 446 gobootit:
pascal@18140 447 //movw ramdisk_size+2-max_timeouts(%si), %cx
pascal@18140 448 .byte 0x8B, 0x4C, ramdisk_size+2-max_timeouts
pascal@18140 449 jmp bootit
pascal@18140 450 #else
pascal@18140 451 jmp read_sectorslp
pascal@18140 452 #endif
pascal@18140 453
pascal@18140 454 putcdot:
pascal@18140 455 movb $'.'+3, %al // . = success, - = failure
pascal@18140 456 putclf:
pascal@18140 457 sbbb $3, %al
pascal@18140 458 putc:
pascal@18140 459 movb $0xe, %ah
pascal@18140 460 movw $7, %bx # one dot each 64k
pascal@18140 461 int $0x10
pascal@18140 462 cmp $0xd, %al # CR ?
pascal@18140 463 je putclf
pascal@18140 464 ret
pascal@18140 465
pascal@18140 466 #ifdef KEYBOARDLESS_SUPPORT
pascal@18140 467 clock = 0x46C
pascal@18140 468 wait:
pascal@18140 469 wait4key:
pascal@18140 470 movw $clock, %di
pascal@18140 471 #define DELAY 5
pascal@18140 472 movb $257-(DELAY*182)/10, %fs:(%di)
pascal@18140 473 waitkbd:
pascal@18140 474 movw $0x10D, %ax # test keyboard, timeout => CR
pascal@18140 475 cmpb %fs:(%di),%ah
pascal@18140 476 je waitdone
pascal@18140 477 int $0x16
pascal@18140 478 jz waitkbd
pascal@18140 479 cbw
pascal@18140 480 int $0x16 # eat char
pascal@18140 481 movw %di, %fs # disable timeout
pascal@18140 482 incw %di # clear Z
pascal@18140 483 waitdone:
pascal@18140 484 ret
pascal@18140 485 #endif
pascal@18140 486
pascal@18140 487 #define kernel_version_offset 0xE
pascal@18140 488 puts_version:
pascal@18140 489 addw kernel_version_offset(%si),%si # starting protocol 2.00, Kernel 1.3.73
pascal@18140 490 puts:
pascal@18140 491 movb $0xd, %al # CR
pascal@18140 492 putcs:
pascal@18140 493 call putc
pascal@18140 494 lodsb
pascal@18140 495 cmpb $0, %al # end of string is any byte <= 0
pascal@18140 496 jg putcs
pascal@18140 497 ret
pascal@18140 498
pascal@18140 499 swap_floppy:
pascal@18140 500 #ifdef MULTI_INITRD
pascal@18140 501 .ascii "B or "
pascal@18140 502 #endif
pascal@18140 503 .ascii "Next!"
pascal@18140 504 .byte 7,13,0 # swap detection needs 13, 0
pascal@18140 505 #ifdef MULTI_INITRD
pascal@18140 506 max_timeouts:
pascal@18140 507 .byte 20
pascal@18140 508 table:
pascal@18140 509 .org cur_initrd_size_ofs
pascal@18140 510 cur_initrd_size:
pascal@18140 511 .word table
pascal@18140 512 .byte table+4-256
pascal@18140 513 #endif
pascal@18140 514 .org 0x1F1