load multiboot memory map, heap is done!!!

1 files changed, 26 insertions, 0 deletions

diff --git a/kernel/mboot/mboot.c b/kernel/mboot/mboot.c
new file mode 100644
index 0000000..08a0f37
--- /dev/null
+++ b/kernel/mboot/mboot.c
@@ -0,0 +1,26 @@
+
+#include "mboot.h"
+
+void *locate_mboot_table(volatile void *mboot, uint32_t type)
+{
+	struct mboot_info *info = (struct mboot_info *) mboot;
+	const char *mboot_end = ((char *) info) + info->total_size;
+
+	char *tag_ptr = info->tags;
+
+	while (tag_ptr < mboot_end) {
+		struct mboot_tag *tag = (struct mboot_tag *) tag_ptr;
+
+		if (tag->type == type)
+			return tag;
+
+		// goto next
+		int size = tag->size;
+		if (size % 8 != 0) {
+			size += 8 - (size % 8);
+		}
+		tag_ptr += size;
+	}
+
+	return NULL;
+}