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Move translation tables into separate section

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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
This commit is contained in:
Jeenu Viswambharan 2014-02-17 17:26:51 +00:00 • committed by Dan Handley
parent d265bd7c31
commit 74cbb83983
5 changed files with 31 additions and 4 deletions
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9
bl1/bl1.ld.S
View file

@ -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

9
bl2/bl2.ld.S
View file

@ -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)

9
bl31/bl31.ld.S
View file

@ -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)

4
plat/fvp/aarch64/plat_common.c
View file

@ -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

4
plat/fvp/platform.h
View file

@ -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