boot: longmode to realmode stub

This is the initial commit to the repo. It adds all the code.
The last proper thing that I got working before committing is
calling real mode functions from long mode using a stub.
Next up, I would like to implement a disk reader abstraction over
the BIOS in order to read form partitions (most notably FAT32).

1 files changed, 6 insertions, 0 deletions

diff --git a/rt/memset.ha b/rt/memset.ha
new file mode 100644
index 0000000..01b9946
--- /dev/null
+++ b/rt/memset.ha
@@ -0,0 +1,6 @@
+export fn memset(dest: *void, val: u8, amt: size) void = {
+	let a = dest: *[*]u8;
+	for (let i = 0z; i < amt; i += 1) {
+		a[i] = val;
+	};
+};