From e50cbe8eb763cf63fb44b047d5164f6fbf07eb39 Mon Sep 17 00:00:00 2001
From: Alejandro Sior <aho@sior.be>
Date: Fri, 13 May 2022 20:50:39 +0200
Subject: 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).
---
 real/real.ha | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 real/real.ha

(limited to 'real')

diff --git a/real/real.ha b/real/real.ha
new file mode 100644
index 0000000..ee42523
--- /dev/null
+++ b/real/real.ha
@@ -0,0 +1,22 @@
+export type state = struct {
+	@offset(0) eax: u32,
+	@offset(4) ebx: u32,
+	@offset(8) ecx: u32,
+	@offset(12) edx: u32,
+	@offset(16) edi: u32,
+	@offset(20) esi: u32
+};
+
+export let regs: state;
+
+
+export fn clearregs() void = {
+	regs = state {
+		...
+	};
+};
+
+export @symbol("real.call") fn call(addr: u16) void;
+
+export @symbol("testt") fn testt() void;
+export @symbol("drive_read_lba") fn drive_read_lba() void;
-- 
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