image: Add support for placing crypto_algo in linker lists

The purpose of this change is to enable crypto algorithms to be placed
in linker lists, rather than be declared as a static array. The goal
is to remove the crypto_algos array in a subsequent patch.

Create a new linker list named "cryptos", and search it when
image_get_crypto_algo() is invoked.

NOTE that adding support for manual relocation of crypto_algos within
linker lists is beyond the scope of this patch.
Signed-off-by: NAlexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

common/image-sig.c

@@ -107,6 +107,7 @@ struct checksum_algo *image_get_checksum_algo(const char *full_name)
 
 struct crypto_algo *image_get_crypto_algo(const char *full_name)
 {
+	struct crypto_algo *crypto, *end;
 	int i;
 	const char *name;
 
@@ -133,6 +134,14 @@ struct crypto_algo *image_get_crypto_algo(const char *full_name)
 			return &crypto_algos[i];
 	}
 
+	crypto = ll_entry_start(struct crypto_algo, cryptos);
+	end = ll_entry_end(struct crypto_algo, cryptos);
+	for (; crypto < end; crypto++) {
+		if (!strcmp(crypto->name, name))
+			return crypto;
+	}
+
+	/* Not found */
 	return NULL;
 }
 

include/image.h

@@ -47,6 +47,7 @@ struct fdt_region;
 #include <lmb.h>
 #include <asm/u-boot.h>
 #include <command.h>
+#include <linker_lists.h>
 
 /* Take notice of the 'ignore' property for hashes */
 #define IMAGE_ENABLE_IGNORE	1
@@ -1328,6 +1329,10 @@ struct crypto_algo {
 		      uint8_t *sig, uint sig_len);
 };
 
+/* Declare a new U-Boot crypto algorithm handler */
+#define U_BOOT_CRYPTO_ALGO(__name)						\
+ll_entry_declare(struct crypto_algo, __name, cryptos)
+
 struct padding_algo {
 	const char *name;
 	int (*verify)(struct image_sign_info *info,