void
main (void)
{
vga_init ();
if (vga_getcurrentchipset () != CIRRUS)
{
printf ("Not a Cirrus.\n");
printf ("Continue anyway (y/n)?\n");
if (getchar () != 'y')
exit (-1);
}
/* Unlock extended registers. */
outb (0x3c4, 0x06);
outb (0x3c5, 0x12);
/*
Tested on VLB AVGA3 CL-GD5426 on 40MHz VLB
0x1c 50 MHz (boot-up default)
0x21 59
0x22 62
0x23 OK
0x24 OK
0x25 OK
0x26 OK [This corresponds to the highest value
mentioned in the databook (which does
not mean that it is supposed to work
on all cards); the book also says the
parts are not specified for more than
50 MHz].
0x27 occasional loose pixels
0x28 occasional problems
0x29 some problems
0x2A 16M/textmode problems
0x2c 256/32k color problems
*/
outb (0x3c4, 0x1f);
printf ("Old MCLK value: %02x\n", inb (0x3c5));
outb (0x3c4, 0x1f);
outb (0x3c5, NEW_MCLK);
printf ("New MCLK value: %02x\n", NEW_MCLK);
exit (0);
}
int main(int argc, char *argv[])
{
int i,j;
if (!(argc == 2 && strcmp(argv[1], "--force") == 0))
if (!(vga_getmodeinfo(vga_getdefaultmode())->flags & CAPABLE_LINEAR)) {
printf("Linear addressing not supported for this chipset.\n");
exit(1);
}
vga_init();
vga_setmode(vga_getdefaultmode());
vga_setpage(0);
#ifdef USE_LINEAR_ADDRESSING
if (vga_setlinearaddressing() == -1) {
vga_setmode(TEXT);
printf("Could not set linear addressing.\n");
exit(-1);
}
#endif
/* Should not mess with bank register after this. */
vbuf = vga_getgraphmem();
printf("vbuf mapped at %08lx.\n", (unsigned long) vbuf);
getchar();
#ifdef USE_LINEAR_ADDRESSING
memset(vbuf, 0x88, 640 * 480);
sleep(1);
memset(vbuf, 0, 640 * 480);
for (i = 0; i < 100000; i++)
*(vbuf + (rand() & 0xfffff)) = rand();
#endif
#if 0
if (vga_getcurrentchipset() == CIRRUS)
/* Show the bandwidth of the extended write modes of the */
/* Cirrus chip. */
by8test();
#endif
getchar();
for(i = 0;i < 44;i++){
*(vbuf + i) = 0x1c;
*(vbuf + 640*17 + i) = 0x1c;
*(vbuf + 640*480 - i) = 0x1c;
*(vbuf + 640*480 - 1 - 640*17 - i) = 0x1c;
for(j = 1;j < 17;j++){
*(vbuf + 640*j + i) = (i == 0 || i == 43)? 0x1c:0;
*(vbuf + 640*480 - 1 - 640*j - i) = (i == 0 || i == 43)? 0x1c:0;
}
}
for(i = 3;i < 10;i++)
for(j = 4;j < 10;j++){
*(vbuf + i + 640*j) = 0x3f;
*(vbuf + 640*480 -1 -640*j - i) = 0x3f;
}
getchar();
vga_setmode(TEXT);
return 0;
}
