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console vga stuff

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slinky55
2026-07-14 17:40:30 -05:00
parent 454de8feed
commit 6a79a20cf6
15 changed files with 456 additions and 559 deletions
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70
kernel/drivers/vga/vga.c
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@@ -6,6 +6,7 @@
#include <drivers/vga/vga.h>
#include <common.h>
#include <memory/mm.h>
static uint32_t framebuffer_address;
static uint32_t framebuffer_width;
@@ -14,76 +15,51 @@ static uint32_t framebuffer_total_pixels;
static uint32_t framebuffer_pitch;
static uint32_t framebuffer_bpp;
enum vga_color {
VGA_COLOR_BLACK = 0,
VGA_COLOR_BLUE = 1,
VGA_COLOR_GREEN = 2,
VGA_COLOR_CYAN = 3,
VGA_COLOR_RED = 4,
VGA_COLOR_MAGENTA = 5,
VGA_COLOR_BROWN = 6,
VGA_COLOR_LIGHT_GREY = 7,
VGA_COLOR_DARK_GREY = 8,
VGA_COLOR_LIGHT_BLUE = 9,
VGA_COLOR_LIGHT_GREEN = 10,
VGA_COLOR_LIGHT_CYAN = 11,
VGA_COLOR_LIGHT_RED = 12,
VGA_COLOR_LIGHT_MAGENTA = 13,
VGA_COLOR_LIGHT_BROWN = 14,
VGA_COLOR_WHITE = 15,
};
void vga_init(
uint32_t fb_vaddr,
uint32_t fb_paddr,
uint32_t fb_width,
uint32_t fb_height,
uint32_t fb_pitch,
uint8_t fb_bpp
) {
framebuffer_address = fb_vaddr;
uint32_t fb_size_bytes = fb_height * fb_pitch;
uint32_t num_pages = (fb_size_bytes + 4095) / 4096;
for (uint32_t i = 0; i < num_pages; i++) {
uint32_t phys_addr = fb_paddr + (i * 4096);
uint32_t virt_addr = VGA_FRAMEBUFFER + (i * 4096);
map_page(virt_addr, phys_addr, PAGE_PRESENT | PAGE_WRITABLE);
}
framebuffer_address = VGA_FRAMEBUFFER;
framebuffer_width = fb_width;
framebuffer_height = fb_height;
framebuffer_pitch = fb_pitch;
framebuffer_bpp = fb_bpp;
framebuffer_total_pixels = framebuffer_width * framebuffer_height;
vga_clear_scrn(0xFFFFFFFF);
vga_clear_scrn(0x000000FF);
}
uint32_t vga_get_pitch() {
return framebuffer_pitch;
}
void vga_clear_scrn(uint32_t color) {
if (framebuffer_address == 0) return;
// Completely ignore the framebuffer address for a split second.
// Let's force raw ASCII text into the legacy VGA text console area.
uint16_t* text_mode_buffer = (uint16_t*)0xB8000;
// Fill the screen with 'A' characters on a red background
for (int i = 0; i < 80 * 25; i++) {
text_mode_buffer[i] = (0x4F << 8) | 'A';
for (uint32_t y = 0; y < framebuffer_height; y++) {
uint32_t* row = (uint32_t*)((uintptr_t)framebuffer_address + (y * framebuffer_pitch));
for (uint32_t x = 0; x < framebuffer_width; x++) {
row[x] = color;
}
}
}
void vga_putchar(char c) {
if (c == '\n') {
return;
}
void vga_drawchar(char c, int x, int y, psf_font_t* font) {
if (c == '\t') {
for (int i = 0; i < 4; i++) {
vga_putchar(' ');
}
return;
}
}
uint32_t vga_seek(vfs_node_t* node, uint32_t offset, int whence) {
return 0;
}
uint32_t vga_write(vfs_node_t* node, uint32_t offset, uint32_t size, uint8_t* buf) {
for (uint32_t i = 0; i < size; i++) {
vga_putchar((char)buf[i]);
}
// probably just memcpy here
return size;
}