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https://src.fedoraproject.org/rpms/grub2.git
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40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: dann frazier <dann.frazier@canonical.com>
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Date: Thu, 25 Aug 2022 17:08:09 -0600
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Subject: [PATCH] linuxefi: Invalidate i-cache before starting the kernel
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We need to flush the memory range of the code we are about to execute
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from the instruction cache before we can safely execute it. Not doing
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so appears to be the source of rare synchronous exceptions a user
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is seeing on a Cortex-A72-based platform while executing the Linux EFI
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stub. Notably they seem to correlate with an instruction on a cache
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line boundary.
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Signed-off-by: dann frazier <dann.frazier@canonical.com>
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---
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grub-core/loader/efi/linux.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
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index 277f352e0c..e413bdcc23 100644
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--- a/grub-core/loader/efi/linux.c
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+++ b/grub-core/loader/efi/linux.c
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@@ -16,6 +16,7 @@
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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+#include <grub/cache.h>
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#include <grub/err.h>
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#include <grub/mm.h>
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#include <grub/types.h>
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@@ -210,6 +211,9 @@ grub_efi_linux_boot (grub_addr_t kernel_addr, grub_size_t kernel_size,
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asm volatile ("cli");
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#endif
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+ /* Invalidate the instruction cache */
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+ grub_arch_sync_caches((void *)kernel_addr, kernel_size);
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+
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hf = (handover_func)((char *)kernel_addr + handover_offset + offset);
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hf (grub_efi_image_handle, grub_efi_system_table, kernel_params);
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