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  • /*
     * (C) Copyright 2002
     * Daniel Engstrm, Omicron Ceti AB, daniel@omicron.se
    
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     *
    
     * 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 */
    
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    #define OFFS_DI      6     /* low 16 bits of EDI */
    
    #define OFFS_ESI     10    /* 32bit */
    
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    #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 */
    
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    #define OFFS_FLAGS   44    /* 16bit */
    
    
    #define SEGMENT      0x40
    
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    #define STACK	     0x800			/* stack at 0x40:0x800 -> 0x800 */
    
    
    /* save general registers */
    /* save some segments     */
    /* save callers stack segment .. */
    /* ... in gs */
    
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    	/* 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     ; \
    		\
    
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    	popal					/* restore GP registers */