image: fit: Align hash output buffers

Hardware-accelerated hash functions require that the input and output
buffers be aligned to the minimum DMA alignment. memalign.h helpfully
provides a macro just for this purpose. It doesn't exist on the host,
but we don't need to be aligned there either.

Fixes: 5dfb521 ("[new uImage] New uImage low-level API")
Signed-off-by: Sean Anderson <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

Author: sean-anderson-seco

boot/image-fit.c

@@ -24,6 +24,7 @@
 #include <mapmem.h>
 #include <asm/io.h>
 #include <malloc.h>
+#include <memalign.h>
 #include <asm/global_data.h>
 #ifdef CONFIG_DM_HASH
 #include <dm.h>
@@ -1263,7 +1264,8 @@ int calculate_hash(const void *data, int data_len, const char *name,
 static int fit_image_check_hash(const void *fit, int noffset, const void *data,
 				size_t size, char **err_msgp)
 {
-	uint8_t value[FIT_MAX_HASH_LEN];
+	DEFINE_ALIGN_BUFFER(uint8_t, value, FIT_MAX_HASH_LEN,
+			    ARCH_DMA_MINALIGN);
 	int value_len;
 	const char *algo;
 	uint8_t *fit_value;

tools/mkimage.h

@@ -41,6 +41,9 @@ static inline ulong map_to_sysmem(void *ptr)
 	return (ulong)(uintptr_t)ptr;
 }
 
+#define ARCH_DMA_MINALIGN 1
+#define DEFINE_ALIGN_BUFFER(type, name, size, alugn) type name[size]
+
 #define MKIMAGE_TMPFILE_SUFFIX		".tmp"
 #define MKIMAGE_MAX_TMPFILE_LEN		256
 #define MKIMAGE_DEFAULT_DTC_OPTIONS	"-I dts -O dtb -p 500"