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common/board_f: factor out reserve_stacks

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Introduce arch_reserve_stacks() to tailor gd->start_addr_sp and gd->irq_sp to
the architecture needs.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Andreas Bießmann 2015-02-06 23:06:45 +01:00
parent 4db896236c
commit 68145d4c7b
6 changed files with 102 additions and 35 deletions
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18
include/common.h
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@ -252,6 +252,24 @@ static inline int print_cpuinfo(void)
int update_flash_size(int flash_size);
int arch_early_init_r(void);
/**
* Reserve all necessary stacks
*
* This is used in generic board init sequence in common/board_f.c. Each
* architecture could provide this function to tailor the required stacks.
*
* On entry gd->start_addr_sp is pointing to the suggested top of the stack.
* The callee ensures gd->start_add_sp is 16-byte aligned, so architectures
* require only this can leave it untouched.
*
* On exit gd->start_addr_sp and gd->irq_sp should be set to the respective
* positions of the stack. The stack pointer(s) will be set to this later.
* gd->irq_sp is only required, if the architecture needs it.
*
* @return 0 if no error
*/
__weak int arch_reserve_stacks(void);
/**
* Show the DRAM size in a board-specific way
*