mboot parsing

1 files changed, 40 insertions, 0 deletions

diff --git a/src/arch/amd64/mboot.h b/src/arch/amd64/mboot.h
new file mode 100644
index 0000000..88348f5
--- /dev/null
+++ b/src/arch/amd64/mboot.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <stdint.h>
+
+#define CMDLINE_MAX 32
+
+struct mboot_tag {
+	uint8_t valid; // if the tag at this location is set
+	uint32_t type;
+	uint32_t size;
+	union {
+		char cmdline[CMDLINE_MAX + 1];
+		void *rootsdp;
+	} data;
+};
+
+enum mboot_tag_type {
+	MBOOT_CMDLINE = 0,
+	MBOOT_XSDP = 14
+};
+
+struct mboot_info {
+	uint32_t total_size;
+	uint32_t reserved;
+	struct mboot_tag tags[21];
+};
+
+/**
+ * Loads the multi boot information
+ * @param mboot_info - the pointer passed from multiboot2
+ */
+struct mboot_info mboot_load_info(void *mboot_info);
+
+/**
+ * Gets a tag from multiboot
+ * @param type - the tag type
+ * @returns NULL - tag not loaded
+ * @returns tag - tag was loaded
+ */
+struct mboot_tag *mboot_get_tag(struct mboot_info *info, enum mboot_tag_type type);