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pub inline fn outb(port: u16, value: u8) void {
asm volatile ("outb %[value], %[port]"
:: [port] "N{dx}" (port), [value] "{al}" (value),
);
}
const VGACell = packed struct {
char: u8,
foreground: u4 = 0xf,
background: u4 = 0x0,
};
const VGATerminal = struct {
const width = 80;
const height = 25;
const vram: *[width * height]VGACell = @ptrFromInt(0xB8000);
offset: u16 = 0,
pub fn put(self: *VGATerminal, ch: u8) void {
vram[self.offset] = VGACell{ .char = ch };
self.offset += 1;
}
fn checkpos(self: *VGATerminal) void {
if (self.offset >= width * height) {
const onebefore = (width - 1) * height;
@memcpy(vram, vram[width..onebefore]);
@memset(vram[onebefore..], 0);
self.offset = onebefore;
}
}
pub fn updatecursor(self: VGATerminal) void {
outb(0x03d4, 0x0f);
outb(0x03d5, @intCast(self.offset & 0xFF));
outb(0x03d4, 0x0e);
outb(0x03d5, @intCast(self.offset >> 8));
}
};
export fn zigit() void {
var vga = VGATerminal{};
vga.put('H');
vga.put('i');
vga.updatecursor();
}
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