The UEFI spec mandates that unaligned memory access should be enabled if
supported by the CPU architecture.
This patch adds an empty weak function unaligned_access() that can be
overridden by an architecture specific routine.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
cmd/bootefi.c | 13 +++++++++++++
include/asm-generic/unaligned.h | 3 +++
2 files changed, 16 insertions(+)
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index ba258ac9f3..412e6519ba 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -18,6 +18,7 @@
#include <memalign.h>
#include <asm/global_data.h>
#include <asm-generic/sections.h>
+#include <asm-generic/unaligned.h>
#include <linux/linkage.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -89,6 +90,15 @@ out:
return ret;
}
+/*
+ * Allow unaligned memory access.
+ *
+ * This routine is overridden by architectures providing this feature.
+ */
+void __weak allow_unaligned(void)
+{
+}
+
/*
* Set the load options of an image from an environment variable.
*
@@ -351,6 +361,9 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
efi_status_t r;
void *fdt_addr;
+ /* Allow unaligned memory access */
+ allow_unaligned();
+
/* Initialize EFI drivers */
r = efi_init_obj_list();
if (r != EFI_SUCCESS) {
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index fd0255099a..3d33a5a063 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -20,4 +20,7 @@
#error invalid endian
#endif
+/* Allow unaligned memory access */
+void allow_unaligned(void);
+
#endif
--
2.16.3
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