89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#include <lib/stream.h>
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#include <drivers/vga/vga.h>
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#include <common.h>
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static uint32_t framebuffer_address;
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static uint32_t framebuffer_width;
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static uint32_t framebuffer_height;
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static uint32_t framebuffer_total_pixels;
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static uint32_t framebuffer_pitch;
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static uint32_t framebuffer_bpp;
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enum vga_color {
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VGA_COLOR_BLACK = 0,
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VGA_COLOR_BLUE = 1,
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VGA_COLOR_GREEN = 2,
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VGA_COLOR_CYAN = 3,
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VGA_COLOR_RED = 4,
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VGA_COLOR_MAGENTA = 5,
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VGA_COLOR_BROWN = 6,
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VGA_COLOR_LIGHT_GREY = 7,
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VGA_COLOR_DARK_GREY = 8,
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VGA_COLOR_LIGHT_BLUE = 9,
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VGA_COLOR_LIGHT_GREEN = 10,
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VGA_COLOR_LIGHT_CYAN = 11,
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VGA_COLOR_LIGHT_RED = 12,
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VGA_COLOR_LIGHT_MAGENTA = 13,
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VGA_COLOR_LIGHT_BROWN = 14,
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VGA_COLOR_WHITE = 15,
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};
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void vga_init(
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uint32_t fb_vaddr,
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uint32_t fb_width,
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uint32_t fb_height,
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uint32_t fb_pitch,
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uint8_t fb_bpp
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) {
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framebuffer_address = fb_vaddr;
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framebuffer_width = fb_width;
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framebuffer_height = fb_height;
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framebuffer_pitch = fb_pitch;
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framebuffer_bpp = fb_bpp;
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framebuffer_total_pixels = framebuffer_width * framebuffer_height;
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vga_clear_scrn(0xFFFFFFFF);
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}
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void vga_clear_scrn(uint32_t color) {
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if (framebuffer_address == 0) return;
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// Completely ignore the framebuffer address for a split second.
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// Let's force raw ASCII text into the legacy VGA text console area.
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uint16_t* text_mode_buffer = (uint16_t*)0xB8000;
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// Fill the screen with 'A' characters on a red background
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for (int i = 0; i < 80 * 25; i++) {
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text_mode_buffer[i] = (0x4F << 8) | 'A';
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}
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}
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void vga_putchar(char c) {
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if (c == '\n') {
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return;
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}
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if (c == '\t') {
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for (int i = 0; i < 4; i++) {
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vga_putchar(' ');
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}
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return;
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}
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}
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uint32_t vga_seek(vfs_node_t* node, uint32_t offset, int whence) {
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return 0;
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}
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uint32_t vga_write(vfs_node_t* node, uint32_t offset, uint32_t size, uint8_t* buf) {
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for (uint32_t i = 0; i < size; i++) {
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vga_putchar((char)buf[i]);
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}
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return size;
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} |