From 6a033344b594f4cb57379c6888e17197185d7bfa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Lov=C3=A9n?= <thomasloven@gmail.com>
Date: Sun, 16 Jan 2022 21:19:49 +0100
Subject: [PATCH] Save ACPI table address from multiboot headers

---
 src/kernel/boot/multiboot.c    | 4 ++++
 src/kernel/include/multiboot.h | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/src/kernel/boot/multiboot.c b/src/kernel/boot/multiboot.c
index e781e18..89f10e2 100644
--- a/src/kernel/boot/multiboot.c
+++ b/src/kernel/boot/multiboot.c
@@ -56,6 +56,10 @@ static int parse_multiboot2(struct taglist *tags)
             case MBOOT2_TAG_FBINFO:
                 kernel_boot_data.fbinfo = (void *)tag->data;
                 break;
+            case MBOOT2_TAG_OLD_RSDP:
+            case MBOOT2_TAG_NEW_RSDP:
+                kernel_boot_data.rsdp = (void *)tag->data;
+                break;
         }
         
         // Tags are 8 byte alligned, so make sure we look for the next one in the right place
diff --git a/src/kernel/include/multiboot.h b/src/kernel/include/multiboot.h
index 9433581..17e3a95 100644
--- a/src/kernel/include/multiboot.h
+++ b/src/kernel/include/multiboot.h
@@ -10,6 +10,8 @@
 #define MBOOT2_TAG_BOOTLOADER 2
 #define MBOOT2_TAG_MMAP 6
 #define MBOOT2_TAG_FBINFO 8
+#define MBOOT2_TAG_OLD_RSDP 14
+#define MBOOT2_TAG_NEW_RSDP 15
 
 #ifndef __ASSEMBLER__
 #include <stddef.h>
@@ -36,6 +38,7 @@ struct kernel_boot_data_st{
     unsigned int mmap_len;
     void *mmap;
     struct fbinfo *fbinfo;
+    void *rsdp;
 };
 
 #define MMAP_FREE 1