FWU: Add Generic Firmware Update framework support in BL1

Firmware update(a.k.a FWU) feature is part of the TBB architecture.
BL1 is responsible for carrying out the FWU process if platform
specific code detects that it is needed.

This patch adds support for FWU feature support in BL1 which is
included by enabling `TRUSTED_BOARD_BOOT` compile time flag.

This patch adds bl1_fwu.c which contains all the core operations
of FWU, which are; SMC handler, image copy, authentication, execution
and resumption. It also adds bl1.h introducing #defines for all
BL1 SMCs.

Following platform porting functions are introduced:

int bl1_plat_mem_check(uintptr_t mem_base, unsigned int mem_size,
unsigned int flags);
	This function can be used to add platform specific memory checks
	for the provided base/size for the given security state.
	The weak definition will invoke `assert()` and return -ENOMEM.

__dead2 void bl1_plat_fwu_done(void *cookie, void *reserved);
	This function can be used to initiate platform specific procedure
	to mark completion of the FWU process.
	The weak definition waits forever calling `wfi()`.

plat_bl1_common.c contains weak definitions for above functions.

FWU process starts when platform detects it and return the image_id
other than BL2_IMAGE_ID by using `bl1_plat_get_next_image_id()` in
`bl1_main()`.

NOTE: User MUST provide platform specific real definition for
bl1_plat_mem_check() in order to use it for Firmware update.

Change-Id: Ice189a0885d9722d9e1dd03f76cac1aceb0e25ed

1 files changed, 56 insertions, 0 deletions

diff --git a/bl1/bl1_main.c b/bl1/bl1_main.c
index 54da735e..84d56110 100644
--- a/bl1/bl1_main.c
+++ b/bl1/bl1_main.c
@@ -32,11 +32,19 @@
 #include <arch_helpers.h>
 #include <assert.h>
 #include <auth_mod.h>
+#include <bl1.h>
 #include <bl_common.h>
 #include <debug.h>
 #include <platform.h>
 #include <platform_def.h>
+#include <smcc_helpers.h>
 #include "bl1_private.h"
+#include <uuid.h>
+
+/* BL1 Service UUID */
+DEFINE_SVC_UUID(bl1_svc_uid,
+	0xfd3967d4, 0x72cb, 0x4d9a, 0xb5, 0x75,
+	0x67, 0x15, 0xd6, 0xf4, 0xbb, 0x4a);
 
 
 static void bl1_load_bl2(void);
@@ -131,8 +139,14 @@ void bl1_main(void)
 	/* Get the image id of next image to load and run. */
 	image_id = bl1_plat_get_next_image_id();
 
+	/*
+	 * We currently interpret any image id other than
+	 * BL2_IMAGE_ID as the start of firmware update.
+	 */
 	if (image_id == BL2_IMAGE_ID)
 		bl1_load_bl2();
+	else
+		NOTICE("BL1-FWU: *******FWU Process Started*******\n");
 
 	bl1_prepare_next_image(image_id);
 }
@@ -213,3 +227,45 @@ void print_debug_loop_message(void)
 	NOTICE("BL1: Please connect the debugger to continue\n");
 }
 #endif
+
+/*******************************************************************************
+ * Top level handler for servicing BL1 SMCs.
+ ******************************************************************************/
+register_t bl1_smc_handler(unsigned int smc_fid,
+	register_t x1,
+	register_t x2,
+	register_t x3,
+	register_t x4,
+	void *cookie,
+	void *handle,
+	unsigned int flags)
+{
+
+#if TRUSTED_BOARD_BOOT
+	/*
+	 * Dispatch FWU calls to FWU SMC handler and return its return
+	 * value
+	 */
+	if (is_fwu_fid(smc_fid)) {
+		return bl1_fwu_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
+			handle, flags);
+	}
+#endif
+
+	switch (smc_fid) {
+	case BL1_SMC_CALL_COUNT:
+		SMC_RET1(handle, BL1_NUM_SMC_CALLS);
+
+	case BL1_SMC_UID:
+		SMC_UUID_RET(handle, bl1_svc_uid);
+
+	case BL1_SMC_VERSION:
+		SMC_RET1(handle, BL1_SMC_MAJOR_VER | BL1_SMC_MINOR_VER);
+
+	default:
+		break;
+	}
+
+	WARN("Unimplemented BL1 SMC Call: 0x%x \n", smc_fid);
+	SMC_RET1(handle, SMC_UNK);
+}