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nios2: implement _arch_irq_lock / unlock

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Change-Id: I16fd64577f45db9531dd0d472279c255c5b8ff13
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2016-05-06 15:14:05 -07:00 • committed by Benjamin Walsh
commit 7ff96dc4a4
1 changed files with 31 additions and 4 deletions
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35
include/arch/nios2/arch.h
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@ -48,15 +48,42 @@ extern "C" {
static ALWAYS_INLINE unsigned int _arch_irq_lock(void)
{
/* STUB */
unsigned int key;
return 0;
NIOS2_READ_STATUS(key);
NIOS2_WRITE_STATUS(key & ~NIOS2_STATUS_PIE_MSK);
return key;
}
static ALWAYS_INLINE void _arch_irq_unlock(unsigned int key)
{
/* STUB */
ARG_UNUSED(key);
/* If the CPU is built without certain features, then
* the only writable bit in the status register is PIE
* in which case we can just write the value stored in key,
* all the other writable bits will be the same.
*
* If not, other stuff could have changed and we need to
* specifically flip just that bit.
*/
#if (NIOS2_NUM_OF_SHADOW_REG_SETS > 0) || \
(defined NIOS2_EIC_PRESENT) || \
(defined NIOS2_MMU_PRESENT) || \
(defined NIOS2_MPU_PRESENT)
uint32_t status_reg;
/* Interrupts were already locked when irq_lock() was called,
* so don't do anything
*/
if (!(key & NIOS2_STATUS_PIE_MSK))
return;
NIOS2_READ_STATUS(status_reg);
NIOS2_WRITE_STATUS(status_reg | NIOS2_STATUS_PIE_MSK);
#else
NIOS2_WRITE_STATUS(key);
#endif
}
int _arch_irq_connect_dynamic(unsigned int irq, unsigned int priority,