-int vbe_set_palette_bits(int bits)
-{
- struct dpmi_real_regs regs;
-
- memset(®s, 0, sizeof regs);
- regs.eax = 0x4f08;
- regs.ebx = bits << 8; /* bits in bh */
- dpmi_real_int(0x10, ®s);
-
- if((regs.eax >> 8) & 0xff == 3) {
- return -1;
- }
- return regs.ebx >> 8 & 0xff; /* new color bits in bh */
-}
-
-/* TODO: implement palette setting through the VBE2 interface for
- * non-VGA displays (actually don't).
- */
-void vbe_set_palette(int idx, int *col, int count, int bits)
-{
- int i, shift = 8 - bits;
-
- __asm {
- mov dx, VGA_DAC_ADDR_WR
- mov eax, idx
- out dx, al
- }
-
- for(i=0; i<count; i++) {
- unsigned char r = *col++;
- unsigned char g = *col++;
- unsigned char b = *col++;
-
- if(shift) {
- r >>= shift;
- g >>= shift;
- b >>= shift;
- }
-
- __asm {
- mov dx, VGA_DAC_DATA
- mov al, r
- out dx, al
- mov al, g
- out dx, al
- mov al, b
- out dx, al
- }
- }
-}
-
-static unsigned int get_mask(int sz, int pos)
-{
- unsigned int i, mask = 0;
-
- for(i=0; i<sz; i++) {
- mask |= 1 << i;
- }
- return mask << pos;
-}
-
-void print_mode_info(FILE *fp, struct vbe_mode_info *mi)
-{
- fprintf(fp, "resolution: %dx%d\n", mi->xres, mi->yres);
- fprintf(fp, "color depth: %d\n", mi->bpp);
- fprintf(fp, "mode attributes: %x\n", mi->mode_attr);
- fprintf(fp, "bytes per scanline: %d\n", mi->scanline_bytes);
- fprintf(fp, "number of planes: %d\n", (int)mi->num_planes);
- fprintf(fp, "number of banks: %d\n", (int)mi->num_banks);
- fprintf(fp, "mem model: %d\n", (int)mi->mem_model);
- fprintf(fp, "red bits: %d (mask: %x)\n", (int)mi->rmask_size, get_mask(mi->rmask_size, mi->rpos));
- fprintf(fp, "green bits: %d (mask: %x)\n", (int)mi->gmask_size, get_mask(mi->gmask_size, mi->gpos));
- fprintf(fp, "blue bits: %d (mask: %x)\n", (int)mi->bmask_size, get_mask(mi->bmask_size, mi->bpos));
- fprintf(fp, "framebuffer address: %x\n", mi->fb_addr);