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ARMv8: enable pre-allocation malloc 

Allocate memory space for pre-allocation malloc and zero global data.
This code is partly from crt0.S.

Signed-off-by: David Feng <fenghua@phytium.com.cn>
This commit is contained in:
David Feng 2015-01-31 11:55:28 +08:00 committed by Albert ARIBAUD
parent f643d9294f
commit b263302aa5
2 changed files with 11 additions and 6 deletions
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4
arch/arm/include/asm/config.h
View File

@ -7,10 +7,6 @@
#ifndef _ASM_CONFIG_H_
#define _ASM_CONFIG_H_
#ifdef __aarch64__
#define CONFIG_SYS_GENERIC_GLOBAL_DATA
#endif
#define CONFIG_LMB
#define CONFIG_SYS_BOOT_RAMDISK_HIGH

13
arch/arm/lib/crt0_64.S
View File

@ -62,9 +62,18 @@ ENTRY(_main)
* Set up initial C runtime environment and call board_init_f(0).
*/
ldr x0, =(CONFIG_SYS_INIT_SP_ADDR)
sub x0, x0, #GD_SIZE /* allocate one GD above SP */
sub x18, x0, #GD_SIZE /* allocate one GD above SP */
bic x18, x18, #0x7 /* 8-byte alignment for GD */
zero_gd:
sub x0, x0, #0x8
str xzr, [x0]
cmp x0, x18
b.gt zero_gd
#if defined(CONFIG_SYS_MALLOC_F_LEN)
sub x0, x18, #CONFIG_SYS_MALLOC_F_LEN
str x0, [x18, #GD_MALLOC_BASE]
#endif
bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */
mov x18, sp /* GD is above SP */
mov x0, #0
bl board_init_f