From 4fb58cf0afe83d921e1072d58a4f899696d8fe7e Mon Sep 17 00:00:00 2001
From: Qiumiao Zhang <[email protected]>
Date: Tue, 13 Jun 2023 11:20:51 +0800
Subject: [PATCH] kern/acpi: Use xsdt_addr if present

According to the ACPI specification, in ACPI 2.0 or later, an
ACPI-compatible OS must use the XSDT if present. So, we should
use xsdt_addr instead of rsdt_addr if xsdt_addr is valid.

Reference:https://git.savannah.gnu.org/cgit/grub.git/commit/?id=4fb58cf0afe83d921e1072d58a4f899696d8fe7e
Conflict:NA

Signed-off-by: Qiumiao Zhang <[email protected]>
Reviewed-by: Daniel Kiper <[email protected]>
---
 grub-core/kern/acpi.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/grub-core/kern/acpi.c b/grub-core/kern/acpi.c
index 5746ac0..524c402 100644
--- a/grub-core/kern/acpi.c
+++ b/grub-core/kern/acpi.c
@@ -99,12 +99,6 @@ grub_acpi_find_fadt (void)
   if (fadt)
     return fadt;
   rsdpv2 = grub_machine_acpi_get_rsdpv2 ();
-  if (rsdpv2)
-    fadt = grub_acpi_rsdt_find_table ((struct grub_acpi_table_header *)
-				      (grub_addr_t) rsdpv2->rsdpv1.rsdt_addr,
-				      GRUB_ACPI_FADT_SIGNATURE);
-  if (fadt)
-    return fadt;
   if (rsdpv2
 #if GRUB_CPU_SIZEOF_VOID_P != 8
       && !(rsdpv2->xsdt_addr >> 32)
@@ -115,5 +109,11 @@ grub_acpi_find_fadt (void)
 				      GRUB_ACPI_FADT_SIGNATURE);
   if (fadt)
     return fadt;
+  if (rsdpv2)
+    fadt = grub_acpi_rsdt_find_table ((struct grub_acpi_table_header *)
+				      (grub_addr_t) rsdpv2->rsdpv1.rsdt_addr,
+				      GRUB_ACPI_FADT_SIGNATURE);
+  if (fadt)
+    return fadt;
   return 0;
 }
-- 
2.27.0