From 76ea83e70c5c852de9efdf857f6ee95be7d6e6c8 Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Tue, 8 Apr 2025 11:49:51 -0400
Subject: acpi

---
 kernel/mboot/rsdp.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 kernel/mboot/rsdp.c

(limited to 'kernel/mboot/rsdp.c')

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;
+}
-- 
cgit v1.2.3-freya