load multiboot memory map, heap is done!!!

1 files changed, 49 insertions, 0 deletions

diff --git a/kernel/mboot/mmap.c b/kernel/mboot/mmap.c
new file mode 100644
index 0000000..c17d510
--- /dev/null
+++ b/kernel/mboot/mmap.c
@@ -0,0 +1,49 @@
+#include <lib.h>
+#include <comus/mboot.h>
+
+#include "mboot.h"
+#include <stdint.h>
+#include <stdio.h>
+
+static const char *segment_type[] = {
+	"Reserved",
+	"Free",
+	"Reserved",
+	"ACPI Reserved",
+	"Hibernation",
+	"Defective",
+	"Unknown"
+};
+
+void mboot_load_mmap(volatile void *mboot, struct memory_map *res)
+{
+	void *tag = locate_mboot_table(mboot, MBOOT_MEMORY_MAP);
+	struct mboot_tag_mmap *mmap = (struct mboot_tag_mmap *) tag;
+
+	int idx = 0;
+	uintptr_t i = (uintptr_t)mmap->entries;
+	printf("MEMORY MAP\n");
+	char buf[20];
+	for (;
+			i < (uintptr_t)mmap->entries + mmap->size;
+			i += mmap->entry_size, idx++
+	) {
+		struct mboot_mmap_entry *seg = (struct mboot_mmap_entry *) i;
+		const char *type = NULL;
+		if (seg->type > 6)
+			type = segment_type[6];
+		else
+			type = segment_type[seg->type];
+		printf("ADDR: %16p  LEN: %4s  TYPE: %s (%d)\n",
+				(void *)seg->addr,
+				btoa(seg->len, buf),
+				type,
+				seg->type
+		);
+		if (seg->type != 1 || seg->len < 1)
+			continue;
+		res->entries[idx].addr = seg->addr;
+		res->entries[idx].len = seg->len;
+	}
+	res->entry_count = idx;
+}