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qemu fb
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parent
eec8119eee
commit
09b4390004
5 changed files with 78 additions and 1 deletions
5
include/fb.h
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5
include/fb.h
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@ -0,0 +1,5 @@
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#pragma once
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#include <stdint.h>
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int fb_init(uint16_t res_x, uint16_t res_y);
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68
src/arch/amd64/fb.c
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68
src/arch/amd64/fb.c
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#include "bindings.h"
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#include <stdint.h>
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#include <stddef.h>
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#define PREFERRED_VY 4096
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#define PREFERRED_B 32
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uint16_t fb_res_x = 0;
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uint16_t fb_res_y = 0;
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uint16_t fb_res_b = 0;
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uint8_t *fb_buffer = NULL;
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int fb_init(uint16_t res_x, uint16_t res_y) {
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outw(0x1CE, 0x00);
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uint16_t i = inw(0x1CF);
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if (i < 0xB0C0 || i > 0xB0C6) {
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return -1;
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}
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outw(0x1CF, 0xB0C4);
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i = inw(0x1CF);
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/* Disable VBE */
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outw(0x1CE, 0x04);
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outw(0x1CF, 0x00);
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/* Set X resolution to 1024 */
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outw(0x1CE, 0x01);
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outw(0x1CF, res_x);
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/* Set Y resolution to 768 */
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outw(0x1CE, 0x02);
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outw(0x1CF, res_y);
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/* Set bpp to 32 */
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outw(0x1CE, 0x03);
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outw(0x1CF, PREFERRED_B);
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/* Set Virtual Height to stuff */
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outw(0x1CE, 0x07);
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outw(0x1CF, PREFERRED_VY);
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/* Re-enable VBE */
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outw(0x1CE, 0x04);
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outw(0x1CF, 0x41);
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uint32_t * text_vid_mem = (uint32_t *)0xA0000;
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text_vid_mem[0] = 0xA5ADFACE;
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for (uintptr_t fb_offset = 0xE0000000; fb_offset < 0xFF000000; fb_offset += 0x01000000) {
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/* Enable the higher memory */
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for (uintptr_t i = fb_offset; i < fb_offset; i += 0x1000) {
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// todo ident map fb
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}
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/* Go find it */
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for (uintptr_t x = fb_offset; x < fb_offset + 0xFF0000; x += 0x1000) {
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if (((uintptr_t *)x)[0] == 0xA5ADFACE) {
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fb_buffer = (uint8_t *) x;
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goto mem_found;
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}
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}
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}
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mem_found:
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fb_res_x = res_x;
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fb_res_y = res_y;
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fb_res_b = PREFERRED_B;
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return 0;
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}
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0
src/arch/amd64/fb.h
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0
src/arch/amd64/fb.h
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@ -57,7 +57,8 @@ static int get_maxphysaddr() {
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__cpuid(0x80000008, eax, ebx, ecx, edx);
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return eax & 0xFF;
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}
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#define PREFERRED_VY 4096
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#define PREFERRED_B 32
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// entry point for amd64
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void* amd64_shim(void *boot_info) {
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struct pml4e *pml4 = (struct pml4e *)0x1000;
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@ -1,9 +1,12 @@
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#include <lib.h>
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#include <serial.h>
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#include <fb.h>
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void kmain(void *info) {
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char buf[20];
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*(char*)0xB8000 = 'c';
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*(char*)(0xB8002 + 0x20'0000) = 'd';
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itoa((long)info, buf, 10);
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fb_init(1024, 768);
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serial_out_str(buf);
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}
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