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zig fixes

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This commit is contained in:
Clyne 2024-10-02 21:00:53 -04:00
parent 71eecf3849
commit 77631785ed
Signed by: clyne
GPG Key ID: 3267C8EBF3F9AFC7
1 changed files with 12 additions and 13 deletions
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25
src/ziggie.zig
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@ -1,26 +1,24 @@
pub inline fn outb(port: u16, value: u8) void {
asm volatile ("outb %[value], %[port]"
:
: [port] "N{dx}" (port),
[value] "{al}" (value),
:: [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]u16 = @ptrFromInt(0xB8000);
const vram: *[width * height]VGACell = @ptrFromInt(0xB8000);
offset: u16 = 0,
foreground: u8 = 0x07,
background: u8 = 0x00,
pub fn put(self: *VGATerminal, ch: u8) void {
const cell = ch
| (@as(u16, self.foreground) << 8)
| (@as(u16, self.background) << 12);
vram[self.offset] = cell;
vram[self.offset] = VGACell{ .char = ch };
self.offset += 1;
}
@ -35,13 +33,14 @@ const VGATerminal = struct {
pub fn updatecursor(self: VGATerminal) void {
outb(0x03d4, 0x0f);
_ = self;
outb(0x03d5, @intCast(self.offset & 0xFF));
outb(0x03d4, 0x0e);
outb(0x03d5, @intCast(self.offset >> 8));
}
};
export fn zigit() void {
var vga = VGATerminal{};
vga.foreground = 0x0f;
vga.put('H');
vga.put('i');
vga.updatecursor();