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arc: use one of the interrupt stacks during early init

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Same issue as with ARM. ARC can use _Swap() though, because the call to
it is serial, not generating a low-priority exception and interrupts are
locked until the main() thread is context-switched into and the
interrupt stack is released.

Fixes ZEP-1310.

Change-Id: Ie1f27f7ad0502191ca2867b5400d6e0bfb7f0fc6
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2016-11-20 11:49:07 -05:00 committed by Anas Nashif
parent 7f4c294e5c
commit 83e6df26f9
1 changed files with 20 additions and 6 deletions
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26
arch/arc/core/reset.S
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@ -28,11 +28,25 @@
#include <sections.h>
#include <arch/cpu.h>
#ifdef CONFIG_HARVARD
#define _TOP_OF_MEMORY (CONFIG_DCCM_BASE_ADDRESS + CONFIG_DCCM_SIZE * 1024)
/* harvard places the initial stack in the dccm memory */
GDATA(_interrupt_stack)
GDATA(_firq_stack)
/* use one of the available interrupt stacks during init */
/* FIRQ only ? */
#if CONFIG_NUM_IRQ_PRIO_LEVELS == 1
/* FIRQ, but uses _interrupt_stack ? */
#if CONFIG_RGF_NUM_BANKS == 1
#define INIT_STACK _interrupt_stack
#define INIT_STACK_SIZE CONFIG_ISR_STACK_SIZE
#else
#define INIT_STACK _firq_stack
#define INIT_STACK_SIZE CONFIG_FIRQ_STACK_SIZE
#endif
#else
#define _TOP_OF_MEMORY (CONFIG_SRAM_BASE_ADDRESS + CONFIG_SRAM_SIZE * 1024)
#define INIT_STACK _interrupt_stack
#define INIT_STACK_SIZE CONFIG_ISR_STACK_SIZE
#endif
GTEXT(__reset)
@ -58,7 +72,7 @@ SECTION_FUNC(TEXT,__start)
/* lock interrupts: will get unlocked when switch to main task */
clri
/* setup a stack at the end of MEMORY */
mov sp, _TOP_OF_MEMORY
mov sp, INIT_STACK
add sp, sp, INIT_STACK_SIZE
j @_PrepC