fs read/write functions, initrd

1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/mboot/module.c b/kernel/mboot/module.c
new file mode 100644
index 0000000..7a64f2e
--- /dev/null
+++ b/kernel/mboot/module.c
@@ -0,0 +1,24 @@
+#include <comus/mboot.h>
+
+#include "mboot.h"
+
+#define MULTIBOOT_TAG_TYPE_MODULE 3
+
+struct multiboot_tag_module {
+	uint32_t type;
+	uint32_t size;
+	uint32_t mod_start;
+	uint32_t mod_end;
+	char cmdline[];
+};
+
+void *mboot_get_initrd(size_t *len)
+{
+	void *tag = locate_mboot_table(MULTIBOOT_TAG_TYPE_MODULE);
+	if (tag == NULL)
+		return NULL;
+
+	struct multiboot_tag_module *mod = (struct multiboot_tag_module *)tag;
+	*len = mod->mod_end - mod->mod_start;
+	return (void*) (uintptr_t) mod->mod_start;
+}