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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 | /* * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * Based on msbios.c from rolo 1.6: *---------------------------------------------------------------------- * (C) Copyright 2000 * Sysgo Real-Time Solutions GmbH * Klein-Winternheim, Germany *---------------------------------------------------------------------- */ #include "bios.h" /* * During it's initialization phase, before switching to protected * mode, the Linux Kernel makes a few BIOS calls. This won't work * if the board does not have a BIOS. * * This is a very minimalisic BIOS that supplies just enough * functionality to keep the Linux Kernel happy. It is NOT * a general purpose replacement for a real BIOS !! */ .section .bios, "ax" .code16 .org 0 /* a call to f000:0 should warmboot */ jmp realmode_reset .globl rm_int00 rm_int00: pushw $0 jmp any_interrupt16 .globl rm_int01 rm_int01: pushw $1 jmp any_interrupt16 .globl rm_int02 rm_int02: pushw $2 jmp any_interrupt16 .globl rm_int03 rm_int03: pushw $3 jmp any_interrupt16 .globl rm_int04 rm_int04: pushw $4 jmp any_interrupt16 .globl rm_int05 rm_int05: pushw $5 jmp any_interrupt16 .globl rm_int06 rm_int06: pushw $6 jmp any_interrupt16 .globl rm_int07 rm_int07: pushw $7 jmp any_interrupt16 .globl rm_int08 rm_int08: pushw $8 jmp any_interrupt16 .globl rm_int09 rm_int09: pushw $9 jmp any_interrupt16 .globl rm_int0a rm_int0a: pushw $10 jmp any_interrupt16 .globl rm_int0b rm_int0b: pushw $11 jmp any_interrupt16 .globl rm_int0c rm_int0c: pushw $12 jmp any_interrupt16 .globl rm_int0d rm_int0d: pushw $13 jmp any_interrupt16 .globl rm_int0e rm_int0e: pushw $14 jmp any_interrupt16 .globl rm_int0f rm_int0f: pushw $15 jmp any_interrupt16 .globl rm_int10 rm_int10: pushw $16 jmp any_interrupt16 .globl rm_int11 rm_int11: pushw $17 jmp any_interrupt16 .globl rm_int12 rm_int12: pushw $18 jmp any_interrupt16 .globl rm_int13 rm_int13: pushw $19 jmp any_interrupt16 .globl rm_int14 rm_int14: pushw $20 jmp any_interrupt16 .globl rm_int15 rm_int15: pushw $21 jmp any_interrupt16 .globl rm_int16 rm_int16: pushw $22 jmp any_interrupt16 .globl rm_int17 rm_int17: pushw $23 jmp any_interrupt16 .globl rm_int18 rm_int18: pushw $24 jmp any_interrupt16 .globl rm_int19 rm_int19: pushw $25 jmp any_interrupt16 .globl rm_int1a rm_int1a: pushw $26 jmp any_interrupt16 .globl rm_int1b rm_int1b: pushw $27 jmp any_interrupt16 .globl rm_int1c rm_int1c: pushw $28 jmp any_interrupt16 .globl rm_int1d rm_int1d: pushw $29 jmp any_interrupt16 .globl rm_int1e rm_int1e: pushw $30 jmp any_interrupt16 .globl rm_int1f rm_int1f: pushw $31 jmp any_interrupt16 .globl rm_def_int rm_def_int: iret /* * All interrupt jumptable entries jump to here * after pushing the interrupt vector number onto the * stack. */ any_interrupt16: MAKE_BIOS_STACK gs movw OFFS_VECTOR(%bp), %ax cmpw $0x10, %ax je Lint_10h cmpw $0x11, %ax je Lint_11h cmpw $0x12, %ax je Lint_12h cmpw $0x13, %ax je Lint_13h cmpw $0x15, %ax je Lint_15h cmpw $0x16, %ax je Lint_16h cmpw $0x1a, %ax je Lint_1ah movw $0xffff, %ax jmp Lout Lint_10h: /* VGA BIOS services */ call bios_10h jmp Lout Lint_11h: call bios_11h jmp Lout Lint_12h: call bios_12h jmp Lout Lint_13h: /* BIOS disk services */ call bios_13h jmp Lout Lint_15h: /* Misc. BIOS services */ call bios_15h jmp Lout Lint_16h: /* keyboard services */ call bios_16h jmp Lout Lint_1ah: /* PCI bios */ call bios_1ah jmp Lout Lout: cmpw $0, %ax je Lhandeled /* Insert code for unhandeled INTs here. * * ROLO prints a message to the console * (we could do that but then we're in 16bit mode * so we'll have to get back into 32bit mode * to use the console I/O routines (if we do this * we shuls make int 0x10 and int 0x16 work as well)) */ Lhandeled: RESTORE_CALLERS_STACK addw $2,%sp /* dump vector number */ iret /* return from interrupt */ /* ************************************************************ * BIOS interrupt 10h -- VGA services ************************************************************ */ bios_10h: gs movw OFFS_AX(%bp), %ax shrw $8, %ax cmpw $0x3, %ax je Lcur_pos cmpw $0xf, %ax je Lvid_state cmpw $0x12, %ax je Lvid_cfg movw $0xffff, %ax ret Lcur_pos: /* Read Cursor Position and Size */ gs movw $0, OFFS_CX(%bp) gs movw $0, OFFS_DX(%bp) xorw %ax, %ax ret Lvid_state: /* Get Video State */ gs movw $(80 << 8|0x03), OFFS_AX(%bp) /* 80 columns, 80x25, 16 colors */ gs movw $0, OFFS_BX(%bp) xorw %ax, %ax ret Lvid_cfg: /* Video Subsystem Configuration (EGA/VGA) */ gs movw $0x10, OFFS_BX(%bp) /* indicate CGA/MDA/HGA */ xorw %ax, %ax ret /* ************************************************************ * BIOS interrupt 11h -- Equipment determination ************************************************************ */ bios_11h: cs movw bios_equipment, %ax gs movw %ax, OFFS_AX(%bp) xorw %ax, %ax ret /* ************************************************************ * BIOS interrupt 12h -- Get Memory Size ************************************************************ */ bios_12h: cs movw ram_in_64kb_chunks, %ax cmpw $0xa, %ax ja b12_more_than_640k shlw $6, %ax jmp b12_return b12_more_than_640k: movw $0x280, %ax b12_return: gs movw %ax, OFFS_AX(%bp) /* return number of kilobytes in ax */ gs movw OFFS_FLAGS(%bp), %ax andw $0xfffe, %ax /* clear carry -- function succeeded */ gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret /* ************************************************************ * BIOS interrupt 13h -- Disk services ************************************************************ */ bios_13h: gs movw OFFS_AX(%bp), %ax shrw $8, %ax cmpw $0x15, %ax je Lfunc_15h movw $0xffff, %ax ret Lfunc_15h: gs movw OFFS_AX(%bp), %ax andw $0xff, %ax /* return AH=0->drive not present */ gs movw %ax, OFFS_AX(%bp) xorw %ax, %ax ret /* *********************************************************** * BIOS interrupt 15h -- Miscellaneous services *********************************************************** */ bios_15h: gs movw OFFS_AX(%bp), %ax shrw $8, %ax cmpw $0xc0, %ax je Lfunc_c0h cmpw $0xe8, %ax je Lfunc_e8h cmpw $0x88, %ax je Lfunc_88h movw $0xffff, %ax ret Lfunc_c0h: /* Return System Configuration Parameters (PS2 only) */ gs movw OFFS_FLAGS(%bp), %ax orw $1, %ax /* return carry -- function not supported */ gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret Lfunc_e8h: gs movw OFFS_AX(%bp), %ax andw $0xff, %ax cmpw $1, %ax je Lfunc_e801h gs movw OFFS_FLAGS(%bp), %ax orw $1, %ax /* return carry -- function not supported */ gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret Lfunc_e801h: /* Get memory size for >64M Configurations */ cs movw ram_in_64kb_chunks, %ax cmpw $0x100, %ax ja e801_more_than_16mb shlw $6, %ax /* multiply by 64 */ subw $0x400, %ax /* 1st meg does not count */ gs movw %ax, OFFS_AX(%bp) /* return memory size between 1M and 16M in 1kb chunks in AX and CX */ gs movw %ax, OFFS_CX(%bp) gs movw $0, OFFS_BX(%bp) /* set BX and DX to 0*/ gs movw $0, OFFS_DX(%bp) gs movw OFFS_FLAGS(%bp), %ax andw $0xfffe, %ax /* clear carry -- function succeeded */ gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret e801_more_than_16mb: subw $0x100, %ax /* subtract 16MB */ gs movw $0x3c00, OFFS_AX(%bp) /* return 0x3c00 (16MB-1MB) in AX and CX */ gs movw $0x3c00, OFFS_CX(%bp) gs movw %ax, OFFS_BX(%bp) /* set BX and DX to number of 64kb chunks above 16MB */ gs movw %ax, OFFS_DX(%bp) gs movw OFFS_FLAGS(%bp), %ax andw $0xfffe, %ax /* clear carry -- function succeeded */ gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret Lfunc_88h: cs movw ram_in_64kb_chunks, %ax cmpw $0x100, %ax jna b88_not_more_than16 movw $0x100, %ax b88_not_more_than16: shlw $6, %ax subw $0x400, %ax /* 1st meg does not count */ gs movw %ax, OFFS_AX(%bp) /* return number of kilobytes between 16MB and 16MB in ax */ gs movw OFFS_FLAGS(%bp), %ax andw $0xfffe, %ax /* clear carry -- function succeeded */ gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret /* ************************************************************ * BIOS interrupt 16h -- keyboard services ************************************************************ */ bios_16h: gs movw OFFS_AX(%bp), %ax shrw $8, %ax cmpw $0x03, %ax je Lfunc_03h movw $0xffff, %ax ret Lfunc_03h: xorw %ax, %ax /* do nothing -- function not supported */ ret /* ************************************************************ * BIOS interrupt 1ah -- PCI bios ************************************************************ */ bios_1ah: gs movw OFFS_AX(%bp), %ax cmpb $0xb1, %ah je Lfunc_b1h movw $0xffff, %ax ret Lfunc_b1h: call realmode_pci_bios xorw %ax, %ax /* do nothing -- function not supported */ ret .globl ram_in_64kb_chunks ram_in_64kb_chunks: .word 0 .globl bios_equipment bios_equipment: .word 0 |