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irq_offload: ARC implementation

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Uses the "trap_s" exception to simulate entry into IRQ context;
offloaded functions run on the FIRQ stack.

Change-Id: I310ce42b45aca5dabd1d27e486645d23fa0b118f
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2015-11-17 14:08:45 -08:00 • committed by Anas Nashif
commit 2ec374a8df
7 changed files with 98 additions and 2 deletions
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9
arch/arc/include/nano_private.h
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@ -37,6 +37,7 @@ extern "C" {
#include <toolchain.h>
#include <sections.h>
#include <arch/cpu.h>
#include <vector_table.h>
#ifndef _ASMLANGUAGE
#include <nanokernel.h> /* public nanokernel API */
@ -249,7 +250,13 @@ static ALWAYS_INLINE void fiberRtnValueSet(struct tcs *fiber, unsigned int value
static ALWAYS_INLINE int _IS_IN_ISR(void)
{
uint32_t act = _arc_v2_aux_reg_read(_ARC_V2_AUX_IRQ_ACT);
#if CONFIG_IRQ_OFFLOAD
/* Check if we're in a TRAP_S exception as well */
if (_arc_v2_aux_reg_read(_ARC_V2_STATUS32) & _ARC_V2_STATUS32_AE &&
_ARC_V2_ECR_VECTOR(_arc_v2_aux_reg_read(_ARC_V2_ECR)) == EXC_EV_TRAP) {
return 1;
}
#endif
return ((act & 0xffff) != 0);
}