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Diffstat (limited to 'lib_i386/bios.h')
| -rw-r--r-- | lib_i386/bios.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/lib_i386/bios.h b/lib_i386/bios.h new file mode 100644 index 0000000..876fe31 --- /dev/null +++ b/lib_i386/bios.h @@ -0,0 +1,94 @@ +/* + * (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 + */ + +#ifndef _BIOS_H_ +#define _BIOS_H_ + +#define OFFS_ES 0 /* 16bit */ +#define OFFS_GS 2 /* 16bit */ +#define OFFS_DS 4 /* 16bit */ +#define OFFS_EDI 6 /* 32bit */ +#define OFFS_DI 6 /* low 16 bits of EDI */ +#define OFFS_ESI 10 /* 32bit */ +#define OFFS_SI 10 /* low 16 bits of ESI */ +#define OFFS_EBP 14 /* 32bit */ +#define OFFS_BP 14 /* low 16 bits of EBP */ +#define OFFS_ESP 18 /* 32bit */ +#define OFFS_SP 18 /* low 16 bits of ESP */ +#define OFFS_EBX 22 /* 32bit */ +#define OFFS_BX 22 /* low 16 bits of EBX */ +#define OFFS_BL 22 /* low 8 bits of BX */ +#define OFFS_BH 23 /* high 8 bits of BX */ +#define OFFS_EDX 26 /* 32bit */ +#define OFFS_DX 26 /* low 16 bits of EBX */ +#define OFFS_DL 26 /* low 8 bits of BX */ +#define OFFS_DH 27 /* high 8 bits of BX */ +#define OFFS_ECX 30 /* 32bit */ +#define OFFS_CX 30 /* low 16 bits of EBX */ +#define OFFS_CL 30 /* low 8 bits of BX */ +#define OFFS_CH 31 /* high 8 bits of BX */ +#define OFFS_EAX 34 /* 32bit */ +#define OFFS_AX 34 /* low 16 bits of EBX */ +#define OFFS_AL 34 /* low 8 bits of BX */ +#define OFFS_AH 35 /* high 8 bits of BX */ +#define OFFS_VECTOR 38 /* 16bit */ +#define OFFS_IP 40 /* 16bit */ +#define OFFS_CS 42 /* 16bit */ +#define OFFS_FLAGS 44 /* 16bit */ + +#define SEGMENT 0x40 +#define STACK 0x800 /* stack at 0x40:0x800 -> 0x800 */ + +/* save general registers */ +/* save some segments */ +/* save callers stack segment .. */ +/* ... in gs */ + /* setup my segments */ + /* setup BIOS stackpointer */ + +#define MAKE_BIOS_STACK \ + pushal ; \ + pushw %ds ; \ + pushw %gs ; \ + pushw %es ; \ + pushw %ss ; \ + popw %gs ; \ + movw $SEGMENT,%ax ; \ + movw %ax,%ds ; \ + movw %ax,%es ; \ + movw %ax,%ss ; \ + movw %sp,%bp ; \ + movw $STACK,%sp + +#define RESTORE_CALLERS_STACK \ + pushw %gs ; /* restore callers stack segment */ \ + popw %ss ; \ + movw %bp,%sp ; /* restore stackpointer */ \ + \ + popw %es ; /* restore segment selectors */ \ + popw %gs ; \ + popw %ds ; \ + \ + popal /* restore GP registers */ + +#endif |