4 files changed, 45 insertions, 4 deletions
diff --git a/kernel/mboot/mboot.c b/kernel/mboot/mboot.c
index 9156c3c..ce74cc1 100644
--- a/kernel/mboot/mboot.c
+++ b/kernel/mboot/mboot.c
@@ -1,7 +1,18 @@
+#include <lib.h>
+#include <comus/mboot.h>
 
 #include "mboot.h"
 
-void *locate_mboot_table(volatile void *mboot, uint32_t type)
+static volatile void *mboot;
+
+void mboot_init(long magic, volatile void *ptr)
+{
+	if (magic != MBOOT_HEADER_MAGIC)
+		panic("invalid multiboot magic");
+	mboot = ptr;
+}
+
+void *locate_mboot_table(uint32_t type)
 {
 	struct mboot_info *info = (struct mboot_info *)mboot;
 	const char *mboot_end = ((char *)info) + info->total_size;
diff --git a/kernel/mboot/mboot.h b/kernel/mboot/mboot.h
index db85de1..7e8c09a 100644
--- a/kernel/mboot/mboot.h
+++ b/kernel/mboot/mboot.h
@@ -100,6 +100,6 @@ struct mboot_tag_framebuffer {
 	uint16_t reserved;
 };
 
-void *locate_mboot_table(volatile void *mboot, uint32_t type);
+void *locate_mboot_table(uint32_t type);
 
 #endif /* mboot.h */
diff --git a/kernel/mboot/mmap.c b/kernel/mboot/mmap.c
index 8a5f549..1b5f08b 100644
--- a/kernel/mboot/mmap.c
+++ b/kernel/mboot/mmap.c
@@ -8,9 +8,12 @@ static const char *segment_type[] = { "Reserved",	 "Free",
 									  "Hibernation", "Defective",
 									  "Unknown" };
 
-void mboot_load_mmap(volatile void *mboot, struct memory_map *res)
+int mboot_get_mmap(struct memory_map *res)
 {
-	void *tag = locate_mboot_table(mboot, MBOOT_MEMORY_MAP);
+	void *tag = locate_mboot_table(MBOOT_MEMORY_MAP);
+	if (tag == NULL)
+		return 1;
+
 	struct mboot_tag_mmap *mmap = (struct mboot_tag_mmap *)tag;
 
 	int idx = 0;
@@ -33,4 +36,6 @@ void mboot_load_mmap(volatile void *mboot, struct memory_map *res)
 		res->entries[idx].len = seg->len;
 	}
 	res->entry_count = idx;
+
+	return 0;
 }
diff --git a/kernel/mboot/rsdp.c b/kernel/mboot/rsdp.c
new file mode 100644
index 0000000..fb49187
--- /dev/null
+++ b/kernel/mboot/rsdp.c
@@ -0,0 +1,25 @@
+#include <lib.h>
+#include <comus/mboot.h>
+
+#include "mboot.h"
+
+void *mboot_get_rsdp(void)
+{
+	void *tag;
+
+	// acpi 2.0
+	tag = locate_mboot_table(MBOOT_NEW_RSDP);
+	if (tag != NULL) {
+		struct mboot_tag_new_rsdp *rsdp = (struct mboot_tag_new_rsdp *) tag;
+		return rsdp->rsdp;
+	}
+
+	// acpi 1.0
+	tag = locate_mboot_table(MBOOT_OLD_RSDP);
+	if (tag != NULL) {
+		struct mboot_tag_old_rsdp *rsdp = (struct mboot_tag_old_rsdp *) tag;
+		return rsdp->rsdp;
+	}
+
+	return NULL;
+}