LoongArch: Implement cache synchronization operation

Signed-off-by: mengyingkun <mengyingkun@loongson.cn>
(cherry picked from commit 60c48504c262606c75540c014de0c4c5a9ef65bd)

grub.patches

@@ -312,4 +312,5 @@ Patch0306: loongarch-Add-support-for-new-EFI-screen-info-GUID.patch
 Patch0307: 0202-rpm-sort-add-prereqs-for-declaration-of-strchrnul.patch
 %ifarch loongarch64
 Patch0308: loongarch-Force-initrd-load-address-64KiB-alignment.patch
+Patch0309: loongarch-Implement-cache-synchronization-operation.patch
 %endif

grub2.spec

@@ -14,7 +14,7 @@
 Name:		grub2
 Epoch:		1
 Version:	2.06
-Release:	26
+Release:	27
 Summary:	Bootloader with support for Linux, Multiboot and more
 License:	GPLv3+
 URL:		http://www.gnu.org/software/grub/
@@ -439,6 +439,12 @@ fi
 %{_datadir}/man/man*
 
 %changelog
+* Wed Mar 22 2023 mengyingkun <mengyingkun@loongson.cn> - 1:2.06-27
+- Type:bugfix
+- CVE:NA
+- SUG:NA
+- DESC:loongarch: Implement cache synchronization operation
+
 * Sat Mar 18 2023 mengyingkun <mengyingkun@loongson.cn> - 1:2.06-26
 - Type:bugfix
 - CVE:NA

loongarch-Implement-cache-synchronization-operation.patch

@@ -0,0 +1,30 @@
+From 7dccf456ce7fe693c6e488a812dc8f14ea592eeb Mon Sep 17 00:00:00 2001
+From: mengyingkun <mengyingkun@loongson.cn>
+Date: Wed, 22 Mar 2023 09:29:42 +0800
+Subject: [PATCH] loongarch: Implement cache synchronization operation
+
+When the module is loaded, ICACHE and DCACHE need to flush
+before calling init function. If the caches are not flushed,
+loader will crash unexpectedly.
+
+Signed-off-by: mengyingkun <mengyingkun@loongson.cn>
+---
+ grub-core/kern/loongarch64/cache.S | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/grub-core/kern/loongarch64/cache.S b/grub-core/kern/loongarch64/cache.S
+index d291c67..6e32d37 100644
+--- a/grub-core/kern/loongarch64/cache.S
++++ b/grub-core/kern/loongarch64/cache.S
+@@ -19,6 +19,8 @@
+ #include <grub/symbol.h>
+ 
+ FUNCTION (grub_arch_sync_caches)
++	ibar	0
++	dbar	0
+ 	jr	$ra
+ 
+ FUNCTION (grub_arch_sync_dma_caches)
+-- 
+2.33.0
+