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#include <lib.h>
#include <memory.h>
#include <serial.h>
#include <stdint.h>
#include <panic.h>
#include "bindings.h"
#define INDEX 0x1CE
#define DATA 0x1CF
#define INDEX_ID 0
#define INDEX_XRES 1
#define INDEX_YRES 2
#define INDEX_BPP 3
#define INDEX_ENABLE 4
#define INDEX_BANK 5
#define INDEX_VIRT_WIDTH 6
#define INDEX_VIRT_HEIGHT 7
#define INDEX_X_OFFSET 8
#define INDEX_Y_OFFSET 9
#define DATA_DISP_DISABLE 0x00
#define DATA_DISP_ENABLE 0x01
#define DATA_LFB_ENABLE 0x40
#define DATA_NO_CLEAR_MEM 0x80
static void write(uint16_t index, uint16_t data) {
outw(INDEX, index);
outw(DATA, data);
}
static uint16_t read(uint16_t value) {
outw(INDEX, value);
return inw(DATA);
}
static int is_available(void) {
return (read(INDEX_ID) == 0xB0C5);
}
static void set_mode(uint16_t width, uint16_t height, uint16_t bit_depth, int lfb, int clear) {
write(INDEX_ENABLE, DATA_DISP_DISABLE);
write(INDEX_XRES, width);
write(INDEX_YRES, height);
write(INDEX_BPP, bit_depth);
write(INDEX_ENABLE, DATA_DISP_ENABLE |
(lfb ? DATA_LFB_ENABLE : 0) |
(clear ? 0 : DATA_NO_CLEAR_MEM));
}
//static void set_bank(uint16_t bank) {
// write(INDEX_BANK, bank);
//}
int fb_init(uint16_t width, uint16_t height) {
set_mode(width, height, 32, true, true);
if (!is_available())
panic("bochs framebuffer not avaliable");
return 0;
}
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