[PATCHv3 2/4] remoteproc: Add function rproc_get_boot_addr

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From: Sjur Brændeland <sjur.brandeland@xxxxxxxxxxxxxx>

Prepare for introduction of custom firmware loaders by
moving the function operating on ELF data-structures into
separate functions. Move lookup of the boot_addr in the
ELF binary to the function rproc_get_boot_addr().

Signed-off-by: Sjur Brændeland <sjur.brandeland@xxxxxxxxxxxxxx>
---
 drivers/remoteproc/remoteproc_core.c |   24 +++++++++++++++---------
 1 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index c8b428d..648ff88 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1003,6 +1003,20 @@ static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
 	return 0;
 }
 
+/**
+ * rproc_get_boot_addr() - Get rproc's boot address.
+ * @fw: the ELF firmware image
+ *
+ * This function reads the ELF entry point address.
+ * Note that the boot address is not a configurable property of all remote
+ * processors. Some will always boot at a specific hard-coded address.
+ */
+u32 rproc_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
+{
+	struct elf32_hdr *ehdr  = (struct elf32_hdr *)fw->data;
+	return ehdr->e_entry;
+}
+
 /*
  * take a firmware and boot a remote processor with it.
  */
@@ -1010,7 +1024,6 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 {
 	struct device *dev = rproc->dev;
 	const char *name = rproc->firmware;
-	struct elf32_hdr *ehdr;
 	struct resource_table *table;
 	int ret, tablesz;
 
@@ -1018,8 +1031,6 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 	if (ret)
 		return ret;
 
-	ehdr = (struct elf32_hdr *)fw->data;
-
 	dev_info(dev, "Booting fw image %s, size %d\n", name, fw->size);
 
 	/*
@@ -1032,12 +1043,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 		return ret;
 	}
 
-	/*
-	 * The ELF entry point is the rproc's boot addr (though this is not
-	 * a configurable property of all remote processors: some will always
-	 * boot at a specific hardcoded address).
-	 */
-	rproc->bootaddr = ehdr->e_entry;
+	rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
 
 	/* look for the resource table */
 	table = rproc_find_rsc_table(rproc, fw, &tablesz);
-- 
1.7.5.4

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