wok annotate linux/stuff/linux-header-2.6.36.u @ rev 7538

Up: gnutils to 2.10.4.
author Christopher Rogers <slaxemulator@gmail.com>
date Tue Dec 07 07:27:38 2010 +0000 (2010-12-07)
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slaxemulator@7131 1 --- linux-2.6.30.6/arch/x86/boot/header.S
slaxemulator@7131 2 +++ linux-2.6.30.6/arch/x86/boot/header.S
slaxemulator@7131 3 @@ -6,7 +6,7 @@
slaxemulator@7131 4 * Based on bootsect.S and setup.S
slaxemulator@7131 5 * modified by more people than can be counted
slaxemulator@7131 6 *
slaxemulator@7131 7 - * Rewritten as a common file by H. Peter Anvin (Apr 2007)
slaxemulator@7131 8 + * Rewritten Pascal Bellard (Nov 2009)
slaxemulator@7131 9 *
slaxemulator@7131 10 * BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
slaxemulator@7131 11 * addresses must be multiplied by 16 to obtain their respective linear
slaxemulator@7131 12 @@ -27,6 +27,8 @@
slaxemulator@7131 13
slaxemulator@7131 14 BOOTSEG = 0x07C0 /* original address of boot-sector */
slaxemulator@7131 15 SYSSEG = 0x1000 /* historical load address >> 4 */
slaxemulator@7131 16 +INITSEG = 0x9000 /* boot address >> 4 */
slaxemulator@7131 17 +SETUPSEG = 0x9020 /* setup address >> 4 */
slaxemulator@7131 18
slaxemulator@7131 19 #ifndef SVGA_MODE
slaxemulator@7131 20 #define SVGA_MODE ASK_VGA
slaxemulator@7131 21 @@ -40,53 +42,412 @@
slaxemulator@7131 22 #define ROOT_RDONLY 1
slaxemulator@7131 23 #endif
slaxemulator@7131 24
slaxemulator@7131 25 +/* some extra features */
slaxemulator@7131 26 +#define EDIT_CMDLINE on hotkey
slaxemulator@7131 27 +#define SHOW_REGS show int13 status & parameters
slaxemulator@7131 28 +
slaxemulator@7131 29 .code16
slaxemulator@7131 30 .section ".bstext", "ax"
slaxemulator@7131 31
slaxemulator@7131 32 .global bootsect_start
slaxemulator@7131 33 bootsect_start:
slaxemulator@7131 34 + cld # assume nothing
slaxemulator@7131 35 +stacktop = 0x9E00 # in 0x8000 .. 0xA000
slaxemulator@7131 36 +zeroed = 48+10 # gdt + zeroed registers
slaxemulator@7131 37 + movw $stacktop-12-zeroed, %di # stacktop is an arbitrary value >=
slaxemulator@7131 38 + # length of bootsect + length of
slaxemulator@7131 39 + # setup + room for stack;
slaxemulator@7131 40 + # 12 is disk parm size.
slaxemulator@7131 41 + pushw $INITSEG
slaxemulator@7131 42 + popw %es # %es = INITSEG
slaxemulator@7131 43 +
slaxemulator@7131 44 + pushw %es
slaxemulator@7131 45 + popw %ss # %ss and %es already contain INITSEG
slaxemulator@7131 46 + movw %di, %sp # put stack at INITSEG:stacktop-...
slaxemulator@7131 47 +
slaxemulator@7131 48 +# Many BIOS's default disk parameter tables will not recognize
slaxemulator@7131 49 +# multi-sector reads beyond the maximum sector number specified
slaxemulator@7131 50 +# in the default diskette parameter tables - this may mean 7
slaxemulator@7131 51 +# sectors in some cases.
slaxemulator@7131 52 +#
slaxemulator@7131 53 +# Since single sector reads are slow and out of the question,
slaxemulator@7131 54 +# we must take care of this by creating new parameter tables
slaxemulator@7131 55 +# (for the first disk) in RAM. We can set the maximum sector
slaxemulator@7131 56 +# count to 36 - the most we will encounter on an ED 2.88.
slaxemulator@7131 57 +#
slaxemulator@7131 58 +# High doesn't hurt. Low does. Let's use the max: 63
slaxemulator@7131 59 +#
slaxemulator@7131 60 +# Segments are as follows: %es = %ss = INITSEG,
slaxemulator@7131 61 +
slaxemulator@7131 62 + xorw %ax, %ax # %ax = 0
slaxemulator@7131 63 + movw $zeroed/2, %cx # clear gdt + offset, %ds, limits
slaxemulator@7131 64 + rep # don't worry about cld
slaxemulator@7131 65 + stosw # already done above
slaxemulator@7131 66 + popw %bx # offset = 0
slaxemulator@7131 67 + popw %ds # %ds = 0
slaxemulator@7131 68 + popw %gs # %gs = 0
slaxemulator@7131 69 +
slaxemulator@7131 70 + movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0)
slaxemulator@7131 71 + incw %ax
slaxemulator@7131 72 +
slaxemulator@7131 73 + pushw %es
slaxemulator@7131 74 + pushw %di # %ds:%bx+0x78 is parameter table address
slaxemulator@7131 75 + ldsw 0x78(%bx), %si # %ds:%si is source
slaxemulator@7131 76 + movb $6, %cl # copy 12 bytes
slaxemulator@7131 77 + rep # don't worry about cld
slaxemulator@7131 78 + movsw # already done above
slaxemulator@7131 79 + popl %gs:0x78(%bx) # update parameter table address
slaxemulator@7131 80 + pushw %es
slaxemulator@7131 81 + popw %ds # now %ds = %es = %ss = INITSEG
slaxemulator@7131 82 + movb $63, 0x4-12(%di) # patch sector count, %di = stacktop
slaxemulator@7131 83 + cli
slaxemulator@7131 84 +
slaxemulator@7131 85 + xchg %ax, %di # sector count
slaxemulator@7131 86 + popw %ax # limits = 0
slaxemulator@7131 87 + incw %cx # cylinder 0, sector 1
slaxemulator@7131 88 + call read_first_sectors # read setup
slaxemulator@7131 89 +
slaxemulator@7131 90 +offset_version = 0xE
slaxemulator@7131 91 + movw $0x200,%si
slaxemulator@7131 92 + addw offset_version(%si),%si # starting protocol 2.00, Kernel 1.3.73
slaxemulator@7131 93 + call putstr # show which kernel we are loading
slaxemulator@7131 94 +
slaxemulator@7131 95 +# The cmdline can be entered and modifed at boot time.
slaxemulator@7131 96 +# Only characters before the cursor are passed to the kernel.
slaxemulator@7131 97 + popw %bx # clear %bx
slaxemulator@7131 98 + orw cmd_line_ptr, %bx
slaxemulator@7131 99 + jz nocmdline
slaxemulator@7131 100 + pushw %bx
slaxemulator@7131 101 + incw %di
slaxemulator@7131 102 + call read_sectors
slaxemulator@7131 103 + popw %si
slaxemulator@7131 104 + call putstr
slaxemulator@7131 105 +#ifdef EDIT_CMDLINE
slaxemulator@7131 106 +cmdlp:
slaxemulator@7131 107 + movb $0x20, %al # clear end of line
slaxemulator@7131 108 + int $0x10 # with Space
slaxemulator@7131 109 + movb $8, %al # and BackSpace
slaxemulator@7131 110 + int $0x10
slaxemulator@7131 111 + decw %si
slaxemulator@7131 112 +cmdget:
slaxemulator@7131 113 + call wait4key
slaxemulator@7131 114 + cmpb $8, %al # BackSpace ?
slaxemulator@7131 115 + je cmdbs
slaxemulator@7131 116 + movb %al, (%si) # store char
slaxemulator@7131 117 + lodsw # %si += 2
slaxemulator@7131 118 +cmdbs:
slaxemulator@7131 119 +#if 1
slaxemulator@7131 120 + cmpw %si,cmd_line_ptr
slaxemulator@7131 121 + je cmdget
slaxemulator@7131 122 +#endif
slaxemulator@7131 123 + call putc # set %ah and %bx
slaxemulator@7131 124 + cmpb $10, %al # Enter ?
slaxemulator@7131 125 + jne cmdlp
slaxemulator@7131 126 + movb %bh,-2(%si) # set end of string and remove CR
slaxemulator@7131 127 +endcmdline:
slaxemulator@7131 128 +#endif
slaxemulator@7131 129 +nocmdline:
slaxemulator@7131 130
slaxemulator@7131 131 - # Normalize the start address
slaxemulator@7131 132 - ljmp $BOOTSEG, $start2
slaxemulator@7131 133 -
slaxemulator@7131 134 -start2:
slaxemulator@7131 135 - movw %cs, %ax
slaxemulator@7131 136 - movw %ax, %ds
slaxemulator@7131 137 - movw %ax, %es
slaxemulator@7131 138 - movw %ax, %ss
slaxemulator@7131 139 - xorw %sp, %sp
slaxemulator@7131 140 - sti
slaxemulator@7131 141 - cld
slaxemulator@7131 142 -
slaxemulator@7131 143 - movw $bugger_off_msg, %si
slaxemulator@7131 144 +# This routine loads the system at address SYSSEG, making sure
slaxemulator@7131 145 +# no 64kB boundaries are crossed. We try to load it as fast as
slaxemulator@7131 146 +# possible, loading whole tracks whenever we can.
slaxemulator@7131 147 +
slaxemulator@7131 148 +ramdisk_image = 0x0218
slaxemulator@7131 149 +ramdisk_size = 0x021C
slaxemulator@7131 150 + movw %sp, %si # for bootsect_gdt
slaxemulator@7131 151 + decw 16(%si) # bootsect_src = 64Kb
slaxemulator@7131 152 + decw 24(%si) # bootsect_dst = 64Kb
slaxemulator@7131 153 + movw $syssize, %di
slaxemulator@7131 154 +type_of_loader = 0x210
slaxemulator@7131 155 +loadflags = 0x211
slaxemulator@7131 156 +heap_end_ptr = 0x224
slaxemulator@7131 157 +ksyssize = 500
slaxemulator@7131 158 + orw $0x80FF, type_of_loader-ksyssize(%di) # loader type = 0xFF
slaxemulator@7131 159 + movw $stacktop-0x200, heap_end_ptr-ksyssize(%di)
slaxemulator@7131 160 + movb $0x10, %al # destination = 0x100000
slaxemulator@7131 161 + movb $5, %cl
slaxemulator@7131 162 +initrdlp:
slaxemulator@7131 163 + decw %ax
slaxemulator@7131 164 + movb $0x93,%ah
slaxemulator@7131 165 + movw %ax, 28(%si) # bootsect_dst_base+2
slaxemulator@7131 166 + movb $(SYSSEG/4096), %al # source = SYSSEG
slaxemulator@7131 167 + movw %ax, 20(%si) # bootsect_src_base+2
slaxemulator@7131 168 + cbw
slaxemulator@7131 169 + cwde
slaxemulator@7131 170 + shlw %cl, %ax
slaxemulator@7131 171 + decw %ax
slaxemulator@7131 172 + addl (%di),%eax
slaxemulator@7131 173 + shrl %cl, %eax
slaxemulator@7131 174 +syslp:
slaxemulator@7131 175 + pushw $SYSSEG
slaxemulator@7131 176 + popw %es
slaxemulator@7131 177 + movw $128,%di # 64Kb
slaxemulator@7131 178 + subw %di, %ax # max 32M > int 15 limit
slaxemulator@7131 179 + pushf
slaxemulator@7131 180 + jnc not_last
slaxemulator@7131 181 + addw %ax, %di
slaxemulator@7131 182 +not_last:
slaxemulator@7131 183 + xorw %bx, %bx # clear %bx
slaxemulator@7131 184 + pushw %ax
slaxemulator@7131 185 +#if defined(SHOW_REGS)
slaxemulator@7131 186 + pushw %si
slaxemulator@7131 187 + call read_sectors
slaxemulator@7131 188 + popw %si
slaxemulator@7131 189 +#else
slaxemulator@7131 190 + call read_sectors
slaxemulator@7131 191 +#endif
slaxemulator@7131 192 + movw $0x8000, %cx # full 64K
slaxemulator@7131 193 + movb $0x87, %ah
slaxemulator@7131 194 + incb 28(%si) # bootsect_dst_base+2
slaxemulator@7131 195 + int $0x15 # max 16M
slaxemulator@7131 196 + popw %ax
slaxemulator@7131 197 + popf
slaxemulator@7131 198 + ja syslp
slaxemulator@7131 199 + movw ramdisk_image+2,%ax
slaxemulator@7131 200 + movw $ramdisk_size,%di
slaxemulator@7131 201 + movb $9, %cl
slaxemulator@7131 202 + cmpb %al,28(%si)
slaxemulator@7131 203 + jb initrdlp
slaxemulator@7131 204 +
slaxemulator@7131 205 +# This procedure turns off the floppy drive motor, so
slaxemulator@7131 206 +# that we enter the kernel in a known state, and
slaxemulator@7131 207 +# don't have to worry about it later.
slaxemulator@7131 208 +
slaxemulator@7131 209 +#if 1
slaxemulator@7131 210 +kill_motor:
slaxemulator@7131 211 + xchgw %ax, %bx # reset FDC
slaxemulator@7131 212 + int $0x13
slaxemulator@7131 213 +#else
slaxemulator@7131 214 +kill_motor:
slaxemulator@7131 215 + movw $0x3f2, %dx
slaxemulator@7131 216 + xchgw %ax, %bx
slaxemulator@7131 217 + outb %al, %dx
slaxemulator@7131 218 +#endif
slaxemulator@7131 219
slaxemulator@7131 220 -msg_loop:
slaxemulator@7131 221 - lodsb
slaxemulator@7131 222 - andb %al, %al
slaxemulator@7131 223 - jz bs_die
slaxemulator@7131 224 - movb $0xe, %ah
slaxemulator@7131 225 - movw $7, %bx
slaxemulator@7131 226 +# After that (everything loaded), we jump to the setup-routine
slaxemulator@7131 227 +# loaded directly after the bootblock:
slaxemulator@7131 228 +# Segments are as follows: %ds = %ss = INITSEG
slaxemulator@7131 229 +
slaxemulator@7131 230 + ljmp $SETUPSEG, $0
slaxemulator@7131 231 +
slaxemulator@7131 232 +# read_sectors reads %di sectors into %es:0 buffer.
slaxemulator@7131 233 +# %es:0 is updated to the next memory location.
slaxemulator@7131 234 +# First, sectors are read sector by sector until
slaxemulator@7131 235 +# sector per track count is known. Then they are
slaxemulator@7131 236 +# read track by track.
slaxemulator@7131 237 +# Assume no error on first track.
slaxemulator@7131 238 +
slaxemulator@7131 239 +#define FLOPPY_CYLINDERS 80 /* 80 cylinders minimum */
slaxemulator@7131 240 +#define FLOPPY_HEADS 2 /* 2 heads minimum */
slaxemulator@7131 241 +#define FLOPPY_SECTORS 18 /* 18 sectors minimum */
slaxemulator@7131 242 +
slaxemulator@7131 243 +#ifdef SHOW_REGS
slaxemulator@7131 244 +print_loop:
slaxemulator@7131 245 + movb $0x6 + 'A' - 1, %al
slaxemulator@7131 246 + subb %cl, %al
slaxemulator@7131 247 + movw $regs, %si # caller %si is saved
slaxemulator@7131 248 + call putcs # putc(%al) + putstr(%si)
slaxemulator@7131 249 +# it will print out all of the registers.
slaxemulator@7131 250 + popw %bp # load word into %si
slaxemulator@7131 251 + jmp print_all # print %bp (status)
slaxemulator@7131 252 +#endif
slaxemulator@7131 253 +check_limits:
slaxemulator@7131 254 +#ifndef SHOW_REGS
slaxemulator@7131 255 + popw %dx
slaxemulator@7131 256 +#endif
slaxemulator@7131 257 + cmpb $FLOPPY_SECTORS+1, %cl # 18 sectors minimum
slaxemulator@7131 258 + jb check_head
slaxemulator@7131 259 + cmpb %al, %cl # max sector known ?
slaxemulator@7131 260 + ja next_head # no -> store it
slaxemulator@7131 261 +check_head:
slaxemulator@7131 262 + cmpb $FLOPPY_HEADS, %dh # 2 heads minimum
slaxemulator@7131 263 + jb check_cylinder
slaxemulator@7131 264 + cmpb %ah, %dh # max head known ?
slaxemulator@7131 265 + ja next_cylinder # no -> store it
slaxemulator@7131 266 +check_cylinder:
slaxemulator@7131 267 + pushaw
slaxemulator@7131 268 +#ifdef SHOW_REGS
slaxemulator@7131 269 + cmpw $0x600,%bp # disk changed ?
slaxemulator@7131 270 + je reset_floppy
slaxemulator@7131 271 + pushw %es # print %es (named EX)
slaxemulator@7131 272 + pushw %dx # print %dx
slaxemulator@7131 273 + pushw %cx # print %cx
slaxemulator@7131 274 + pushw %bx # print %bx
slaxemulator@7131 275 + xchgw %ax, %si
slaxemulator@7131 276 + movb $2,%ah
slaxemulator@7131 277 + pushw %ax # print %ax
slaxemulator@7131 278 + movb $6,%cl
slaxemulator@7131 279 +print_all:
slaxemulator@7131 280 + movb $4, %ch # 4 hex digits
slaxemulator@7131 281 +print_digit:
slaxemulator@7131 282 + rolw $4, %bp # rotate to use low 4 bits
slaxemulator@7131 283 + movb $0x0f, %al
slaxemulator@7131 284 + andw %bp, %ax # %al = mask for nybble
slaxemulator@7131 285 + addb $0x90, %al # convert %al to ascii hex
slaxemulator@7131 286 + daa # in only four instructions!
slaxemulator@7131 287 + adcb $0x40, %al
slaxemulator@7131 288 + daa
slaxemulator@7131 289 + call putc # set %ah and %bx
slaxemulator@7131 290 + decb %ch
slaxemulator@7131 291 + jnz print_digit
slaxemulator@7131 292 + movb $0x20, %al # SPACE
slaxemulator@7131 293 int $0x10
slaxemulator@7131 294 - jmp msg_loop
slaxemulator@7131 295 -
slaxemulator@7131 296 -bs_die:
slaxemulator@7131 297 - # Allow the user to press a key, then reboot
slaxemulator@7131 298 - xorw %ax, %ax
slaxemulator@7131 299 + loop print_loop
slaxemulator@7131 300 + call wait
slaxemulator@7131 301 + cbw # %ah = 0
slaxemulator@7131 302 +reset_floppy:
slaxemulator@7131 303 +#else
slaxemulator@7131 304 + cbw # %ah = 0
slaxemulator@7131 305 +#endif
slaxemulator@7131 306 + int $0x13 # reset controler
slaxemulator@7131 307 + popaw
slaxemulator@7131 308 +read_sectorslp:
slaxemulator@7131 309 + pushw %dx # some bios break dx...
slaxemulator@7131 310 + pushw %ax # limits
slaxemulator@7131 311 + subb %cl, %al # sectors remaining in track
slaxemulator@7131 312 + ja tolastsect
slaxemulator@7131 313 + movb $1, %al # 1 sector mini
slaxemulator@7131 314 +tolastsect:
slaxemulator@7131 315 + cbw
slaxemulator@7131 316 + cmpw %di, %ax
slaxemulator@7131 317 + jb more1trk
slaxemulator@7131 318 + movw %di, %ax # sectors to read
slaxemulator@7131 319 +more1trk:
slaxemulator@7131 320 + pushw %ax # save context
slaxemulator@7131 321 + movb $2, %ah # cmd: read chs
slaxemulator@7131 322 + int $0x13
slaxemulator@7131 323 +#ifdef SHOW_REGS
slaxemulator@7131 324 + xchgw %ax, %bp # status
slaxemulator@7131 325 +#endif
slaxemulator@7131 326 +# ifdef SHOW_REGS
slaxemulator@7131 327 + popw %si # save %ax
slaxemulator@7131 328 + popw %ax # limits
slaxemulator@7131 329 + popw %dx
slaxemulator@7131 330 +# else
slaxemulator@7131 331 + popw %dx # save %ax
slaxemulator@7131 332 + popw %ax # limits
slaxemulator@7131 333 +# endif
slaxemulator@7131 334 + jc check_limits
slaxemulator@7131 335 + xchgw %ax, %bp
slaxemulator@7131 336 +# ifdef SHOW_REGS
slaxemulator@7131 337 +update_regs:
slaxemulator@7131 338 + incw %cx # next sector
slaxemulator@7131 339 + movw %cx, %fs
slaxemulator@7131 340 + addb $2,%bh # next location
slaxemulator@7131 341 + decw %di # update sector counter
slaxemulator@7131 342 + jz putcdot
slaxemulator@7131 343 + decw %si
slaxemulator@7131 344 + jnz update_regs
slaxemulator@7131 345 +# else
slaxemulator@7131 346 + addw %dx,%cx # next sector
slaxemulator@7131 347 + addb %dl,%bh
slaxemulator@7131 348 + addb %dl,%bh # next location
slaxemulator@7131 349 + subw %dx,%di # update sector counter
slaxemulator@7131 350 + popw %dx
slaxemulator@7131 351 + jz putcdot
slaxemulator@7131 352 +# endif
slaxemulator@7131 353 +read_sectors:
slaxemulator@7131 354 + movw %fs, %cx
slaxemulator@7131 355 + xchgw %ax, %bp
slaxemulator@7131 356 + cmpb %al,%cl # reach sector limit ?
slaxemulator@7131 357 + jne bdendlp
slaxemulator@7131 358 +next_head:
slaxemulator@7131 359 + movb %cl,%al
slaxemulator@7131 360 + incb %dh # next head
slaxemulator@7131 361 + movb $1,%cl # first sector
slaxemulator@7131 362 + cmpb %ah, %dh # reach head limit ?
slaxemulator@7131 363 + jne bdendlp
slaxemulator@7131 364 +next_cylinder:
slaxemulator@7131 365 + movb %dh,%ah
slaxemulator@7131 366 +# NOTE : support 256 cylinders max
slaxemulator@7131 367 + incb %ch # next cylinder
slaxemulator@7131 368 +read_first_sectors:
slaxemulator@7131 369 + movb $0,%dh # first head
slaxemulator@7131 370 +cylinder_count = 496
slaxemulator@7131 371 + cmpb $FLOPPY_CYLINDERS,%ch # reach cylinder limit ?
slaxemulator@7131 372 + jb bdendlp
slaxemulator@7131 373 + cmpb cylinder_count, %ch
slaxemulator@7131 374 + jb bdendlp
slaxemulator@7131 375 +next_floppy:
slaxemulator@7131 376 + movb $0,%ch # first cylinder
slaxemulator@7131 377 + pushaw
slaxemulator@7131 378 + movw $swap_floppy,%si
slaxemulator@7131 379 + incb 12(%si)
slaxemulator@7131 380 + pushw %bx
slaxemulator@7131 381 + call putstr
slaxemulator@7131 382 + popw %bx
slaxemulator@7131 383 +waitfloppy:
slaxemulator@7131 384 + call wait
slaxemulator@7131 385 + jne waitfloppydone
slaxemulator@7131 386 + pushw %dx # some bios break dx...
slaxemulator@7131 387 + cbw
slaxemulator@7131 388 + int $0x13 # reset FDC
slaxemulator@7131 389 + movw $0x201,%ax
slaxemulator@7131 390 +# cwd
slaxemulator@7131 391 +# movw $1,%cx
slaxemulator@7131 392 + int $0x13 # read first sector
slaxemulator@7131 393 + popw %dx
slaxemulator@7131 394 + rclb $1,%ah # floppy changed 06=>0D no error 00
slaxemulator@7131 395 + cmpb -2(%si), %ah # 0D then 00
slaxemulator@7131 396 + jne waitfloppy # no => try again
slaxemulator@7131 397 + incw %si
slaxemulator@7131 398 + orb %ah,%ah # was 00 ?
slaxemulator@7131 399 + jne waitfloppy
slaxemulator@7131 400 +waitfloppydone:
slaxemulator@7131 401 + popaw
slaxemulator@7131 402 +bdendlp:
slaxemulator@7131 403 + jmp read_sectorslp
slaxemulator@7131 404 +
slaxemulator@7131 405 +putcdot:
slaxemulator@7131 406 + pushw %ss
slaxemulator@7131 407 + popw %es # restore es
slaxemulator@7131 408 + movb $0x2e+3, %al # loading... message 2e = .
slaxemulator@7131 409 +putclf:
slaxemulator@7131 410 + subb $3, %al
slaxemulator@7131 411 +putc:
slaxemulator@7131 412 + movb $0xe, %ah
slaxemulator@7131 413 + movw $7, %bx # one dot each 64k
slaxemulator@7131 414 + int $0x10
slaxemulator@7131 415 + cmp $0xd, %al # CR ?
slaxemulator@7131 416 + je putclf
slaxemulator@7131 417 + ret
slaxemulator@7131 418 +
slaxemulator@7131 419 +putstr:
slaxemulator@7131 420 + movb $0xd, %al # CR
slaxemulator@7131 421 +putcs:
slaxemulator@7131 422 + call putc
slaxemulator@7131 423 + lodsb
slaxemulator@7131 424 + orb %al,%al # end of string is \0
slaxemulator@7131 425 + jnz putcs
slaxemulator@7131 426 + ret
slaxemulator@7131 427 +
slaxemulator@7131 428 +clock = 0x46C
slaxemulator@7131 429 +wait:
slaxemulator@7131 430 +wait4key:
slaxemulator@7131 431 + movw $clock, %di
slaxemulator@7131 432 +#define DELAY 5
slaxemulator@7131 433 + movb $(DELAY*182)/10,%cl
slaxemulator@7131 434 + addb %gs:(%di),%cl
slaxemulator@7131 435 +waitkbd:
slaxemulator@7131 436 + movw $0x10D, %ax # test keyboard, timeout => CR
slaxemulator@7131 437 + cmpb %gs:(%di),%cl
slaxemulator@7131 438 + je waitdone
slaxemulator@7131 439 int $0x16
slaxemulator@7131 440 - int $0x19
slaxemulator@7131 441 + jz waitkbd
slaxemulator@7131 442 + cbw
slaxemulator@7131 443 + int $0x16 # eat char
slaxemulator@7131 444 + movw %di, %gs # disable timeout
slaxemulator@7131 445 + incw %di # clear Z
slaxemulator@7131 446 +waitdone:
slaxemulator@7131 447 + ret
slaxemulator@7131 448
slaxemulator@7131 449 - # int 0x19 should never return. In case it does anyway,
slaxemulator@7131 450 - # invoke the BIOS reset code...
slaxemulator@7131 451 - ljmp $0xf000,$0xfff0
slaxemulator@7131 452 -
slaxemulator@7131 453 - .section ".bsdata", "a"
slaxemulator@7131 454 -bugger_off_msg:
slaxemulator@7131 455 - .ascii "Direct booting from floppy is no longer supported.\r\n"
slaxemulator@7131 456 - .ascii "Please use a boot loader program instead.\r\n"
slaxemulator@7131 457 - .ascii "\n"
slaxemulator@7131 458 - .ascii "Remove disk and press any key to reboot . . .\r\n"
slaxemulator@7131 459 - .byte 0
slaxemulator@7131 460 +#ifdef SHOW_REGS
slaxemulator@7131 461 +regs: .asciz "X:"
slaxemulator@7131 462 +#endif
slaxemulator@7131 463
slaxemulator@7131 464 +swap_floppy: .ascii "Insert disk 1"
slaxemulator@7131 465 + .ascii "."
slaxemulator@7131 466 + .byte 7,13,0
slaxemulator@7131 467
slaxemulator@7131 468 # Kernel attributes; used by setup. This is part 1 of the
slaxemulator@7131 469 # header, from the old boot sector.