wip: move inb/outb/write to debugcon.zig

1 files changed, 25 insertions, 0 deletions

diff --git a/src/debugcon.zig b/src/debugcon.zig
new file mode 100644
index 0000000..2049d22
--- /dev/null
+++ b/src/debugcon.zig
@@ -0,0 +1,25 @@
+pub inline fn inb(port: u16) u8 {
+    return asm volatile ("inb %[port], %[result]"
+        : [result] "={al}" (-> u8),
+        : [port] "{dx}" (port),
+        : "dx", "al"
+    );
+}
+
+pub inline fn outb(port: u16, data: u8) void {
+    asm volatile ("outb %[data], %[port]"
+        :
+        : [port] "{dx}" (port),
+          [data] "{al}" (data),
+        : "dx", "al"
+    );
+}
+
+pub fn write(data: []const u8) void {
+    const len: u8 = @intCast(data.len & 0xFF);
+    outb(0xe9, 0x30 + len);
+    for (0..len) |i| {
+        outb(0xe9, 0x30);
+        outb(0xe9, data[i]);
+    }
+}