uniphier: make all BL images completely position-independent

This platform supports multiple SoCs. The next SoC will still keep
quite similar architecture, but the memory base will be changed.

The ENABLE_PIE improves the maintainability and usability. You can reuse
a single set of BL images for other SoC/board without re-compiling TF-A
at all. This will also keep the code cleaner because it avoids #ifdef
around various base addresses.

By defining ENABLE_PIE, BL2_AT_EL3, BL31, and BL32 (TSP) are really
position-independent now. You can load them anywhere irrespective of
their link address.

Change-Id: I8d5e3124ee30012f5b3bfa278b0baff8efd2fff7
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/plat/socionext/uniphier/uniphier_image_desc.c b/plat/socionext/uniphier/uniphier_image_desc.c
index 817029a..8c232ba 100644
--- a/plat/socionext/uniphier/uniphier_image_desc.c
+++ b/plat/socionext/uniphier/uniphier_image_desc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -13,13 +13,19 @@
 
 #include "uniphier.h"
 
+#define UNIPHIER_BL33_OFFSET		0x04000000UL
+#define UNIPHIER_BL33_MAX_SIZE		0x00100000UL
+
+#define UNIPHIER_SCP_OFFSET		0x04100000UL
+#define UNIPHIER_SCP_MAX_SIZE		0x00020000UL
+
 static struct bl_mem_params_node uniphier_image_descs[] = {
 	{
 		.image_id = SCP_BL2_IMAGE_ID,
 
 		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
 				      VERSION_2, image_info_t, 0),
-		.image_info.image_base = UNIPHIER_SCP_BASE,
+		.image_info.image_base = UNIPHIER_SCP_OFFSET,
 		.image_info.image_max_size = UNIPHIER_SCP_MAX_SIZE,
 
 		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
@@ -33,13 +39,13 @@
 
 		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
 				      VERSION_2, image_info_t, 0),
-		.image_info.image_base = BL31_BASE,
-		.image_info.image_max_size = BL31_LIMIT - BL31_BASE,
+		.image_info.image_base = UNIPHIER_BL31_OFFSET,
+		.image_info.image_max_size = UNIPHIER_BL31_MAX_SIZE,
 
 		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
 				      VERSION_2, entry_point_info_t,
 				      SECURE | EXECUTABLE | EP_FIRST_EXE),
-		.ep_info.pc = BL31_BASE,
+		.ep_info.pc = UNIPHIER_BL31_OFFSET,
 		.ep_info.spsr = SPSR_64(MODE_EL3, MODE_SP_ELX,
 					DISABLE_ALL_EXCEPTIONS),
 
@@ -55,13 +61,13 @@
 
 		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
 				      VERSION_2, image_info_t, 0),
-		.image_info.image_base = BL32_BASE,
-		.image_info.image_max_size = BL32_LIMIT - BL32_BASE,
+		.image_info.image_base = UNIPHIER_BL32_OFFSET,
+		.image_info.image_max_size = UNIPHIER_BL32_MAX_SIZE,
 
 		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
 				      VERSION_2, entry_point_info_t,
 				      SECURE | EXECUTABLE),
-		.ep_info.pc = BL32_BASE,
+		.ep_info.pc = UNIPHIER_BL32_OFFSET,
 		.ep_info.spsr = SPSR_64(MODE_EL3, MODE_SP_ELX,
 					DISABLE_ALL_EXCEPTIONS),
 
@@ -73,13 +79,13 @@
 
 		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
 				      VERSION_2, image_info_t, 0),
-		.image_info.image_base = UNIPHIER_BL33_BASE,
+		.image_info.image_base = UNIPHIER_BL33_OFFSET,
 		.image_info.image_max_size = UNIPHIER_BL33_MAX_SIZE,
 
 		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
 				      VERSION_2, entry_point_info_t,
 				      NON_SECURE | EXECUTABLE),
-		.ep_info.pc = UNIPHIER_BL33_BASE,
+		.ep_info.pc = UNIPHIER_BL33_OFFSET,
 		.ep_info.spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
 					DISABLE_ALL_EXCEPTIONS),
 
@@ -88,6 +94,21 @@
 };
 REGISTER_BL_IMAGE_DESCS(uniphier_image_descs)
 
+/*
+ * image_info.image_base and ep_info.pc are the offset from the memory base.
+ * When ENABLE_PIE is set, we never know the real memory base at link-time.
+ * Fix-up the addresses by adding the run-time detected base.
+ */
+void uniphier_init_image_descs(uintptr_t mem_base)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(uniphier_image_descs); i++) {
+		uniphier_image_descs[i].image_info.image_base += mem_base;
+		uniphier_image_descs[i].ep_info.pc += mem_base;
+	}
+}
+
 struct image_info *uniphier_get_image_info(unsigned int image_id)
 {
 	struct bl_mem_params_node *desc;