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