[U-Boot] [PATCH v4 14/14] SECURE BOOT: Change fsl_secboot_validate function to output image addr

[Saksham Jain]

Currently, fsl_secboot_validate function used to set env variable "img_addr"
to contain address of image being validated.

The function has been changed to output image addr via argument
img_addr_ptr. The command esbc_validate sets the env variable
"img_addr".

This change helps when fsl_secboot_validate function is called from within
UBOOT (because now instead of calling function "getenv("img_addr")"
we can directly get the image address.)

Signed-off-by: Aneesh Bansal <aneesh.bansal at nxp.com>
Signed-off-by: Saksham Jain <saksham.jain at nxp.com>
---
Changes for v2:
	- No changes
Changes for v3:
	- No changes
Changes for v4:
	- Cleaned up commit message
 board/freescale/common/cmd_esbc_validate.c | 12 +++++++++++-
 board/freescale/common/fsl_validate.c      | 26 +++++++++++++++-----------
 include/fsl_validate.h                     |  4 ++--
 3 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/board/freescale/common/cmd_esbc_validate.c b/board/freescale/common/cmd_esbc_validate.c
index 375bc24..cefe3cc 100644
--- a/board/freescale/common/cmd_esbc_validate.c
+++ b/board/freescale/common/cmd_esbc_validate.c
@@ -29,6 +29,8 @@ static int do_esbc_validate(cmd_tbl_t *cmdtp, int flag, int argc,
 	char *hash_str = NULL;
 	uintptr_t haddr;
 	int ret;
+	uintptr_t img_addr = 0;
+	char buf[20];
 
 	if (argc < 2)
 		return cmd_usage(cmdtp);
@@ -43,7 +45,15 @@ static int do_esbc_validate(cmd_tbl_t *cmdtp, int flag, int argc,
 	 * part of header. So, the function is called
 	 * by passing this argument as 0.
 	 */
-	ret = fsl_secboot_validate(haddr, hash_str, 0);
+	ret = fsl_secboot_validate(haddr, hash_str, &img_addr);
+
+	/* Need to set "img_addr" even if validation failure.
+	 * Required when SB_EN in RCW set and non-fatal error
+	 * to continue U-Boot
+	 */
+	sprintf(buf, "%lx", img_addr);
+	setenv("img_addr", buf);
+
 	if (ret)
 		return 1;
 
diff --git a/board/freescale/common/fsl_validate.c b/board/freescale/common/fsl_validate.c
index 95059c7..64e4e30 100644
--- a/board/freescale/common/fsl_validate.c
+++ b/board/freescale/common/fsl_validate.c
@@ -570,7 +570,7 @@ static int calc_esbchdr_esbc_hash(struct fsl_secboot_img_priv *img)
 
 	/* Update hash for actual Image */
 	ret = algo->hash_update(algo, ctx,
-		(u8 *)img->img_addr, img->img_size, 1);
+		(u8 *)(*(img->img_addr_ptr)), img->img_size, 1);
 	if (ret)
 		return ret;
 
@@ -646,7 +646,6 @@ static void construct_img_encoded_hash_second(struct fsl_secboot_img_priv *img)
  */
 static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
 {
-	char buf[20];
 	struct fsl_secboot_img_hdr *hdr = &img->hdr;
 	void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
 	u8 *k, *s;
@@ -661,17 +660,14 @@ static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
 	/* If Image Address is not passed as argument to function,
 	 * then Address and Size must be read from the Header.
 	 */
-	if (img->img_addr == 0) {
+	if (*(img->img_addr_ptr) == 0) {
 	#ifdef CONFIG_ESBC_ADDR_64BIT
-		img->img_addr = hdr->pimg64;
+		*(img->img_addr_ptr) = hdr->pimg64;
 	#else
-		img->img_addr = hdr->pimg;
+		*(img->img_addr_ptr) = hdr->pimg;
 	#endif
 	}
 
-	sprintf(buf, "%lx", img->img_addr);
-	setenv("img_addr", buf);
-
 	if (!hdr->img_size)
 		return ERROR_ESBC_CLIENT_HEADER_IMG_SIZE;
 
@@ -814,9 +810,17 @@ static int calculate_cmp_img_sig(struct fsl_secboot_img_priv *img)
 
 	return 0;
 }
-
+/* haddr - Address of the header of image to be validated.
+ * arg_hash_str - Option hash string. If provided, this
+ * overides the key hash in the SFP fuses.
+ * img_addr_ptr - Optional pointer to address of image to be validated.
+ * If non zero addr, this overides the addr of image in header,
+ * otherwise updated to image addr in header.
+ * Acts as both input and output of function.
+ * This pointer shouldn't be NULL.
+ */
 int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
-			uintptr_t img_addr)
+			uintptr_t *img_addr_ptr)
 {
 	struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
 	ulong hash[SHA256_BYTES/sizeof(ulong)];
@@ -869,7 +873,7 @@ int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
 	/* Update the information in Private Struct */
 	hdr = &img->hdr;
 	img->ehdrloc = haddr;
-	img->img_addr = img_addr;
+	img->img_addr_ptr = img_addr_ptr;
 	esbc = (u8 *)img->ehdrloc;
 
 	memcpy(hdr, esbc, sizeof(struct fsl_secboot_img_hdr));
diff --git a/include/fsl_validate.h b/include/fsl_validate.h
index ff6f6b7..a71e1ce 100644
--- a/include/fsl_validate.h
+++ b/include/fsl_validate.h
@@ -238,7 +238,7 @@ struct fsl_secboot_img_priv {
 
 	struct fsl_secboot_sg_table sgtbl[MAX_SG_ENTRIES];	/* SG table */
 	uintptr_t ehdrloc;	/* ESBC Header location */
-	uintptr_t img_addr;	/* ESBC Image Location */
+	uintptr_t *img_addr_ptr;	/* ESBC Image Location */
 	uint32_t img_size;	/* ESBC Image Size */
 };
 
@@ -246,7 +246,7 @@ int do_esbc_halt(cmd_tbl_t *cmdtp, int flag, int argc,
 				char * const argv[]);
 
 int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
-	uintptr_t img_loc);
+	uintptr_t *img_addr_ptr);
 int fsl_secboot_blob_encap(cmd_tbl_t *cmdtp, int flag, int argc,
 	char * const argv[]);
 int fsl_secboot_blob_decap(cmd_tbl_t *cmdtp, int flag, int argc,
-- 
1.8.1.4