basic boot module support

This loads a file from the boot disk into memory. Currently it just gets
printed, but it's going to become a real executable soon.

1 files changed, 31 insertions, 0 deletions

diff --git a/src/arch/i386/multiboot.h b/src/arch/i386/multiboot.h
new file mode 100644
index 0000000..f030247
--- /dev/null
+++ b/src/arch/i386/multiboot.h
@@ -0,0 +1,31 @@
+#pragma once
+#include <stdint.h>
+
+// TODO assert that pointers have 4 bytes.
+
+struct multiboot_mod {
+	void *start;
+	void *end;
+	const char *str;
+	uint32_t _reserved;
+} __attribute__((packed));
+
+struct multiboot_info {
+	uint32_t flag_mem         : 1;
+	uint32_t flag_boot_device : 1;
+	uint32_t flag_cmdline     : 1;
+	uint32_t flag_mods        : 1;
+	uint32_t _flag_other      : 28; // unimplemented
+	
+	uint32_t mem_lower;
+	uint32_t mem_upper;
+
+	uint32_t boot_device;
+
+	const char *cmdline;
+
+	uint32_t mods_count;
+	struct multiboot_mod *mods;
+
+	// [...]
+} __attribute__((packed));