Add support to load BL31 in DRAM

This patch adds an option to the ARM common platforms to load BL31 in the
TZC secured DRAM instead of the default secure SRAM.

To enable this feature, set `ARM_BL31_IN_DRAM` to 1 in build options.
If TSP is present, then setting this option also sets the TSP location
to DRAM and ignores the `ARM_TSP_RAM_LOCATION` build flag.

To use this feature, BL2 platform code must map in the DRAM used by
BL31. The macro ARM_MAP_BL31_SEC_DRAM is provided for this purpose.
Currently, only the FVP BL2 platform code maps in this DRAM.

Change-Id: If5f7cc9deb569cfe68353a174d4caa48acd78d67

2 files changed, 41 insertions, 4 deletions

diff --git a/include/plat/arm/board/common/board_arm_def.h b/include/plat/arm/board/common/board_arm_def.h
index b065537d..d70fbb46 100644
--- a/include/plat/arm/board/common/board_arm_def.h
+++ b/include/plat/arm/board/common/board_arm_def.h
@@ -75,10 +75,10 @@
  */
 #if IMAGE_BL31 || IMAGE_BL32
 # define PLAT_ARM_MMAP_ENTRIES		6
-# define MAX_XLAT_TABLES		3
-#else
-# define PLAT_ARM_MMAP_ENTRIES		9
 # define MAX_XLAT_TABLES		4
+#else
+# define PLAT_ARM_MMAP_ENTRIES		10
+# define MAX_XLAT_TABLES		5
 #endif
 
 #endif /* ARM_BOARD_OPTIMISE_MMAP */
diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index d04f9d6f..18fe7180 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -165,6 +165,12 @@
 						TSP_SEC_MEM_SIZE,	\
 						MT_MEMORY | MT_RW | MT_SECURE)
 
+#if ARM_BL31_IN_DRAM
+#define ARM_MAP_BL31_SEC_DRAM		MAP_REGION_FLAT(		\
+						BL31_BASE,		\
+						PLAT_ARM_MAX_BL31_SIZE,	\
+						MT_MEMORY | MT_RW | MT_SECURE)
+#endif
 
 /*
  * The number of regions like RO(code), coherent and data required by
@@ -240,15 +246,32 @@
 /*******************************************************************************
  * BL2 specific defines.
  ******************************************************************************/
+#if ARM_BL31_IN_DRAM
+/*
+ * BL31 is loaded in the DRAM.
+ * Put BL2 just below BL1.
+ */
+#define BL2_BASE			(BL1_RW_BASE - PLAT_ARM_MAX_BL2_SIZE)
+#define BL2_LIMIT			BL1_RW_BASE
+#else
 /*
  * Put BL2 just below BL31.
  */
 #define BL2_BASE			(BL31_BASE - PLAT_ARM_MAX_BL2_SIZE)
 #define BL2_LIMIT			BL31_BASE
+#endif
 
 /*******************************************************************************
  * BL31 specific defines.
  ******************************************************************************/
+#if ARM_BL31_IN_DRAM
+/*
+ * Put BL31 at the bottom of TZC secured DRAM
+ */
+#define BL31_BASE			ARM_AP_TZC_DRAM1_BASE
+#define BL31_LIMIT			(ARM_AP_TZC_DRAM1_BASE +	\
+						PLAT_ARM_MAX_BL31_SIZE)
+#else
 /*
  * Put BL31 at the top of the Trusted SRAM.
  */
@@ -257,6 +280,7 @@
 						PLAT_ARM_MAX_BL31_SIZE)
 #define BL31_PROGBITS_LIMIT		BL1_RW_BASE
 #define BL31_LIMIT			(ARM_BL_RAM_BASE + ARM_BL_RAM_SIZE)
+#endif
 
 /*******************************************************************************
  * BL32 specific defines.
@@ -266,7 +290,16 @@
  * Trusted DRAM (if available) or the DRAM region secured by the TrustZone
  * controller.
  */
-#if ARM_TSP_RAM_LOCATION_ID == ARM_TRUSTED_SRAM_ID
+#if ARM_BL31_IN_DRAM
+# define TSP_SEC_MEM_BASE		(ARM_AP_TZC_DRAM1_BASE +	\
+						PLAT_ARM_MAX_BL31_SIZE)
+# define TSP_SEC_MEM_SIZE		(ARM_AP_TZC_DRAM1_SIZE -	\
+						PLAT_ARM_MAX_BL31_SIZE)
+# define BL32_BASE			(ARM_AP_TZC_DRAM1_BASE +	\
+						PLAT_ARM_MAX_BL31_SIZE)
+# define BL32_LIMIT			(ARM_AP_TZC_DRAM1_BASE +	\
+						ARM_AP_TZC_DRAM1_SIZE)
+#elif ARM_TSP_RAM_LOCATION_ID == ARM_TRUSTED_SRAM_ID
 # define TSP_SEC_MEM_BASE		ARM_BL_RAM_BASE
 # define TSP_SEC_MEM_SIZE		ARM_BL_RAM_SIZE
 # define TSP_PROGBITS_LIMIT		BL2_BASE
@@ -292,7 +325,11 @@
  * FWU Images: NS_BL1U, BL2U & NS_BL2U defines.
  ******************************************************************************/
 #define BL2U_BASE			BL2_BASE
+#if ARM_BL31_IN_DRAM
+#define BL2U_LIMIT			BL1_RW_BASE
+#else
 #define BL2U_LIMIT			BL31_BASE
+#endif
 #define NS_BL2U_BASE			ARM_NS_DRAM1_BASE
 #define NS_BL1U_BASE			(PLAT_ARM_NVM_BASE + 0x03EB8000)