diff options
Diffstat (limited to 'lib_i386/bios.S')
| -rw-r--r-- | lib_i386/bios.S | 48 |
1 files changed, 23 insertions, 25 deletions
diff --git a/lib_i386/bios.S b/lib_i386/bios.S index ce6e94c..4606419 100644 --- a/lib_i386/bios.S +++ b/lib_i386/bios.S @@ -1,7 +1,7 @@ /* * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se - * + * * See file CREDITS for list of people who contributed to this * project. * @@ -46,9 +46,9 @@ .section .bios, "ax" .code16 .org 0 - /* a call to f000:0 should warmboot */ + /* a call to f000:0 should warmboot */ jmp realmode_reset - + .globl rm_int00 rm_int00: pushw $0 @@ -181,18 +181,18 @@ rm_int1f: 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 + MAKE_BIOS_STACK gs movw OFFS_VECTOR(%bp), %ax cmpw $0x10, %ax - je Lint_10h + je Lint_10h cmpw $0x11, %ax je Lint_11h cmpw $0x12, %ax @@ -210,10 +210,10 @@ gs movw OFFS_VECTOR(%bp), %ax Lint_10h: /* VGA BIOS services */ call bios_10h jmp Lout -Lint_11h: +Lint_11h: call bios_11h jmp Lout -Lint_12h: +Lint_12h: call bios_12h jmp Lout Lint_13h: /* BIOS disk services */ @@ -228,13 +228,13 @@ Lint_16h: /* keyboard services */ Lint_1ah: /* PCI bios */ call bios_1ah jmp Lout -Lout: +Lout: cmpw $0, %ax je Lhandeled - + /* Insert code for unhandeled INTs here. * - * ROLO prints a message to the console + * 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 @@ -286,7 +286,7 @@ gs movw $0x10, OFFS_BX(%bp) /* indicate CGA/MDA/HGA */ bios_11h: cs movw bios_equipment, %ax -gs movw %ax, OFFS_AX(%bp) +gs movw %ax, OFFS_AX(%bp) xorw %ax, %ax ret @@ -327,14 +327,13 @@ gs movw OFFS_AX(%bp), %ax je Lfunc_15h movw $0xffff, %ax ret -Lfunc_15h: +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 - - + /* *********************************************************** @@ -359,7 +358,7 @@ gs movw OFFS_FLAGS(%bp), %ax gs movw %ax, OFFS_FLAGS(%bp) xorw %ax, %ax ret - + Lfunc_e8h: gs movw OFFS_AX(%bp), %ax andw $0xff, %ax @@ -370,31 +369,31 @@ gs movw OFFS_FLAGS(%bp), %ax 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 $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 */ - + 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 %ax, OFFS_DX(%bp) gs movw OFFS_FLAGS(%bp), %ax andw $0xfffe, %ax /* clear carry -- function succeeded */ @@ -410,7 +409,7 @@ cs movw ram_in_64kb_chunks, %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 @@ -461,4 +460,3 @@ ram_in_64kb_chunks: .globl bios_equipment bios_equipment: .word 0 - |