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arc: support interrupt/FIRQ stacks with CONFIG_INIT_STACKS

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Use the main stack during very early boot so that we can call memset on
the interrupt and FIRQ stacks. Iniitalize the them before one of them is
used for the rest of the pre-kernel initialization.

Change-Id: Ib57856a66273dda9382e08fa91da5a54847b77c2
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2016-11-21 12:31:18 -05:00 • committed by Anas Nashif
commit 50eb51a745
1 changed files with 21 additions and 0 deletions
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21
arch/arc/core/reset.S
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@ -30,6 +30,7 @@
GDATA(_interrupt_stack)
GDATA(_firq_stack)
GDATA(_main_stack)
/* use one of the available interrupt stacks during init */
@ -72,6 +73,26 @@ SECTION_FUNC(TEXT,__start)
/* lock interrupts: will get unlocked when switch to main task */
clri
#ifdef CONFIG_INIT_STACKS
/*
* use the main stack to call memset on the interrupt stack and the
* FIRQ stack when CONFIG_INIT_STACKS is enabled before switching to
* one of them for the rest of the early boot
*/
mov sp, _main_stack
add sp, sp, CONFIG_MAIN_STACK_SIZE
mov_s r0, _interrupt_stack
mov_s r1, 0xaa
mov_s r2, CONFIG_ISR_STACK_SIZE
jl memset
mov_s r0, _firq_stack
mov_s r1, 0xaa
mov_s r2, CONFIG_FIRQ_STACK_SIZE
jl memset
#endif
mov sp, INIT_STACK
add sp, sp, INIT_STACK_SIZE