acpi

1 files changed, 25 insertions, 0 deletions

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;
+}