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#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
/* January 1995, Scott Heavner (sdh@po.cwru.edu)
* Changes to allow anyone to compile vga.c under the go32 Linux->dos cross compiler.
* It should also work with DJGPP (the gcc port to msdos). The cross compiler is
* available at ftp://sunsite.unc.edu/pub/Linux/devel/msdos/go32crs.tar.gz.
*
* I compiled it with:
*
* go32gcc vga.c -lpc
* cat /usr/local/go32/bin/go32.exe a.out > vga.exe
*/
#ifdef GO32
#include <pc.h>
#endif
/* VGA index register ports */
#define CRT_I 0x3D4 /* CRT Controller Index (mono: 0x3B4) */
#define ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */
#define GRA_I 0x3CE /* Graphics Controller Index */
#define SEQ_I 0x3C4 /* Sequencer Index */
#define PEL_IW 0x3C8 /* PEL Write Index */
/* VGA data register ports */
#define CRT_D 0x3D5 /* CRT Controller Data Register (mono: 0x3B5) */
#define ATT_R 0x3C1 /* Attribute Controller Data Read Register */
#define GRA_D 0x3CF /* Graphics Controller Data Register */
#define SEQ_D 0x3C5 /* Sequencer Data Register */
#define MIS_R 0x3CC /* Misc Output Read Register */
#define MIS_W 0x3C2 /* Misc Output Write Register */
#define IS1_R 0x3DA /* Input Status Register 1 (mono: 0x3BA) */
#define PEL_D 0x3C9 /* PEL Data Register */
/* VGA indexes max counts */
#define CRT_C 24 /* 24 CRT Controller Registers */
#define ATT_C 21 /* 21 Attribute Controller Registers */
#define GRA_C 9 /* 9 Graphics Controller Registers */
#define SEQ_C 5 /* 5 Sequencer Registers */
#define MIS_C 1 /* 1 Misc Output Register */
/* VGA registers saving indexes */
#define CRT 0 /* CRT Controller Registers start */
#define ATT CRT+CRT_C /* Attribute Controller Registers start */
#define GRA ATT+ATT_C /* Graphics Controller Registers start */
#define SEQ GRA+GRA_C /* Sequencer Registers */
#define MIS SEQ+SEQ_C /* General Registers */
#define END MIS+MIS_C /* last */
unsigned char vga_regs[60];
#ifdef GO32
#define port_out(v,p) outportb(p,v)
#define port_in(p) inportb(p)
#else
void port_out(unsigned char value, unsigned short port)
{
asm
{
mov dx, port
mov al, value
out dx, al
}
} unsigned char port_in(unsigned short port)
{
asm
{
mov dx, port
in al, dx
} return (_AL);
}
#endif
main(int argc, char *argv[])
{
union REGS cpu_regs;
int i;
unsigned char mode;
if (argc != 2) {
printf("Usage: getregs mode (mode must be hexadecimal)\n");
exit(-1);
}
if (!sscanf(argv[1], "%x", &mode)) {
printf("Usage: getregs mode (mode must be hexadecimal)\n");
exit(-1);
}
cpu_regs.h.ah = 0x00;
cpu_regs.h.al = mode;
int86(0x10, &cpu_regs, &cpu_regs);
/* get VGA register values */
for (i = 0; i < CRT_C; i++) {
port_out(i, CRT_I);
vga_regs[CRT + i] = port_in(CRT_D);
}
for (i = 0; i < ATT_C; i++) {
port_in(IS1_R);
port_out(i, ATT_IW);
vga_regs[ATT + i] = port_in(ATT_R);
}
for (i = 0; i < GRA_C; i++) {
port_out(i, GRA_I);
vga_regs[GRA + i] = port_in(GRA_D);
}
for (i = 0; i < SEQ_C; i++) {
port_out(i, SEQ_I);
vga_regs[SEQ + i] = port_in(SEQ_D);
}
vga_regs[MIS] = port_in(MIS_R);
cpu_regs.h.ah = 0x00;
cpu_regs.h.al = 0x03;
int86(0x10, &cpu_regs, &cpu_regs);
printf("/* BIOS mode 0x%02X */\n", mode);
printf("static char regs[60] = {\n ");
for (i = 0; i < 12; i++)
printf("0x%02X,", vga_regs[CRT + i]);
printf("\n ");
for (i = 12; i < CRT_C; i++)
printf("0x%02X,", vga_regs[CRT + i]);
printf("\n ");
for (i = 0; i < 12; i++)
printf("0x%02X,", vga_regs[ATT + i]);
printf("\n ");
for (i = 12; i < ATT_C; i++)
printf("0x%02X,", vga_regs[ATT + i]);
printf("\n ");
for (i = 0; i < GRA_C; i++)
printf("0x%02X,", vga_regs[GRA + i]);
printf("\n ");
for (i = 0; i < SEQ_C; i++)
printf("0x%02X,", vga_regs[SEQ + i]);
printf("\n ");
printf("0x%02X", vga_regs[MIS]);
printf("\n};\n");
}
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