From f3e6838b44a5b37ce7664db5b8662e3d02e5f539 Mon Sep 17 00:00:00 2001 From: Freya Murphy Date: Thu, 17 Apr 2025 00:51:46 -0400 Subject: font rending in framebuffer yay!! --- kernel/drivers/vga.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 kernel/drivers/vga.c (limited to 'kernel/drivers/vga.c') diff --git a/kernel/drivers/vga.c b/kernel/drivers/vga.c new file mode 100644 index 0000000..d73fa9f --- /dev/null +++ b/kernel/drivers/vga.c @@ -0,0 +1,25 @@ +#include +#include +#include +#include +#include + +#define VGA_ADDR 0xB8000 +static volatile uint16_t *buffer = (uint16_t *)VGA_ADDR; + +// color +static uint8_t fg = 15, bg = 0; + +void vga_draw_char(char c, uint16_t x, uint16_t y) +{ + // output character + const size_t index = y * VGA_WIDTH + x; + buffer[index] = c | bg << 12 | fg << 8; + + // set cursor position on screen + const uint16_t pos = y * VGA_HEIGHT + x; + outb(0x3D4, 0x0F); + outb(0x3D5, (uint8_t)(pos & 0xFF)); + outb(0x3D4, 0x0E); + outb(0x3D5, (uint8_t)((pos >> 8) & 0xFF)); +} -- cgit v1.2.3-freya