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/*
* vesainfo.c
*
* Dump information about what VESA graphics modes are supported.
*/
#include <string.h>
#include <stdio.h>
#include <console.h>
#include <com32.h>
#include <inttypes.h>
#include "../lib/sys/vesa/vesa.h"
/* Wait for a keypress */
static void wait_key(void)
{
char ch;
while (fread(&ch, 1, 1, stdin) == 0)
;
}
static void print_modes(void)
{
static com32sys_t rm;
struct vesa_general_info *gi;
struct vesa_mode_info *mi;
uint16_t mode, *mode_ptr;
int lines;
/* Allocate space in the bounce buffer for these structures */
gi = &((struct vesa_info *)__com32.cs_bounce)->gi;
mi = &((struct vesa_info *)__com32.cs_bounce)->mi;
gi->signature = VBE2_MAGIC; /* Get VBE2 extended data */
rm.eax.w[0] = 0x4F00; /* Get SVGA general information */
rm.edi.w[0] = OFFS(gi);
rm.es = SEG(gi);
__intcall(0x10, &rm, &rm);
if ( rm.eax.w[0] != 0x004F ) {
printf("No VESA BIOS detected\n");
return;
} else if ( gi->signature != VESA_MAGIC ) {
printf("VESA information structure has bad magic, trying anyway...\n");
}
printf("VBE version %d.%d\n"
"Mode attrib h_res v_res bpp layout rpos gpos bpos\n",
(gi->version >> 8) & 0xff, gi->version & 0xff);
lines = 1;
mode_ptr = GET_PTR(gi->video_mode_ptr);
while ((mode = *mode_ptr++) != 0xFFFF) {
if (++lines >= 23) {
wait_key();
lines = 0;
}
rm.eax.w[0] = 0x4F01; /* Get SVGA mode information */
rm.ecx.w[0] = mode;
rm.edi.w[0] = OFFS(mi);
rm.es = SEG(mi);
__intcall(0x10, &rm, &rm);
/* Must be a supported mode */
if ( rm.eax.w[0] != 0x004f )
continue;
printf("0x%04x 0x%04x %5u %5u %3u %6u %4u %4u %4u\n",
mode, mi->mode_attr, mi->h_res, mi->v_res, mi->bpp,
mi->memory_layout, mi->rpos, mi->gpos, mi->bpos);
}
}
int main(void)
{
openconsole(&dev_rawcon_r, &dev_stdcon_w);
print_modes();
return 0;
}
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