optee: Add optee_verify_bootm_image()

This patch adds optee_verify_bootm_image() which will be subsequently used
to verify the parameters encoded in the OPTEE header match the memory
allocated to the OPTEE region, OPTEE header magic and version prior to
handing off control to the OPTEE image.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Harinarayan Bhatta <harinarayan@ti.com>
Cc: Andrew F. Davis <afd@ti.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Kever Yang <kever.yang@rock-chips.com>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Cc: Peng Fan <peng.fan@nxp.com>

include/tee/optee.h

@@ -55,4 +55,17 @@ static inline int optee_verify_image(struct optee_header *hdr,
 
 #endif
 
+#if defined(CONFIG_OPTEE)
+int optee_verify_bootm_image(unsigned long image_addr,
+			     unsigned long image_load_addr,
+			     unsigned long image_len);
+#else
+static inline int optee_verify_bootm_image(unsigned long image_addr,
+					   unsigned long image_load_addr,
+					   unsigned long image_len)
+{
+	return -EPERM;
+}
+#endif
+
 #endif /* _OPTEE_H */

lib/optee/optee.c

@@ -29,3 +29,23 @@ int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
 
 	return 0;
 }
+
+int optee_verify_bootm_image(unsigned long image_addr,
+			     unsigned long image_load_addr,
+			     unsigned long image_len)
+{
+	struct optee_header *hdr = (struct optee_header *)image_addr;
+	unsigned long tzdram_start = CONFIG_OPTEE_TZDRAM_BASE;
+	unsigned long tzdram_len = CONFIG_OPTEE_TZDRAM_SIZE;
+
+	int ret;
+
+	ret = optee_verify_image(hdr, tzdram_start, tzdram_len, image_len);
+	if (ret)
+		return ret;
+
+	if (image_load_addr + sizeof(*hdr) != hdr->init_load_addr_lo)
+		ret = -EINVAL;
+
+	return ret;
+}