Move translation tables into separate section

This patch moves the translation tables into their own section. This
saves space that would otherwise have been lost in padding due to page
table alignment constraints. The BL31 and BL32 bases have been
consequently adjusted.

Change-Id: Ibd65ae8a5ce4c4ea9a71a794c95bbff40dc63e65

bl1/bl1.ld.S

@@ -76,6 +76,15 @@ SECTIONS
         __BSS_END__ = .;
     } >RAM
 
+    /*
+     * The .xlat_table section is for full, aligned page tables (4K).
+     * Removing them from .bss avoids forcing 4K alignment on
+     * the .bss section and eliminates the unecessary zero init
+     */
+    xlat_table (NOLOAD) : {
+        *(xlat_table)
+    } >RAM
+
     /*
      * The base address of the coherent memory section must be page-aligned (4K)
      * to guarantee that the coherent data are stored on their own pages and

bl2/bl2.ld.S

@@ -59,6 +59,15 @@ SECTIONS
         __RO_END__ = .;
     } >RAM
 
+    /*
+     * The .xlat_table section is for full, aligned page tables (4K).
+     * Removing them from .bss avoids forcing 4K alignment on
+     * the .bss section and eliminates the unecessary zero init
+     */
+    xlat_table (NOLOAD) : {
+        *(xlat_table)
+    } >RAM
+
     .data . : {
         __DATA_START__ = .;
         *(.data)

bl31/bl31.ld.S

@@ -60,6 +60,15 @@ SECTIONS
         __RO_END__ = .;
     } >RAM
 
+    /*
+     * The .xlat_table section is for full, aligned page tables (4K).
+     * Removing them from .bss avoids forcing 4K alignment on
+     * the .bss section and eliminates the unecessary zero init
+     */
+    xlat_table (NOLOAD) : {
+        *(xlat_table)
+    } >RAM
+
     .data . : {
         __DATA_START__ = .;
         *(.data)

plat/fvp/aarch64/plat_common.c

@@ -67,14 +67,14 @@ __attribute__ ((aligned((ADDR_SPACE_SIZE >> 30) << 3)));
  * space needed to address secure peripherals e.g. trusted ROM and RAM.
  ******************************************************************************/
 static unsigned long l2_xlation_table[NUM_L2_PAGETABLES][NUM_2MB_IN_GB]
-__attribute__ ((aligned(NUM_2MB_IN_GB << 3)));
+__attribute__ ((aligned(NUM_2MB_IN_GB << 3), section("xlat_table")));
 
 /*******************************************************************************
  * Level 3 translation tables (2 sets) describe the trusted & non-trusted RAM
  * regions at a granularity of 4K.
  ******************************************************************************/
 static unsigned long l3_xlation_table[NUM_L3_PAGETABLES][NUM_4K_IN_2MB]
-__attribute__ ((aligned(NUM_4K_IN_2MB << 3)));
+__attribute__ ((aligned(NUM_4K_IN_2MB << 3), section("xlat_table")));
 
 /*******************************************************************************
  * Helper to create a level 1/2 table descriptor which points to a level 2/3

plat/fvp/platform.h

@@ -225,12 +225,12 @@
 /*******************************************************************************
  * BL2 specific defines.
  ******************************************************************************/
-#define BL2_BASE			0x0402B000
+#define BL2_BASE			0x0402D000
 
 /*******************************************************************************
  * BL31 specific defines.
  ******************************************************************************/
-#define BL31_BASE			0x0400E000
+#define BL31_BASE			0x0400C000
 
 /*******************************************************************************
  * Platform specific page table and MMU setup constants