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ARM_ATOMIC.h
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ARM_ATOMIC.h
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/*
* This is port of Dean Camera's ATOMIC_BLOCK macros for AVR to ARM Cortex M3
* v1.0
* Mark Pendrith, Nov 27, 2012.
*
* From Mark:
* >When I ported the macros I emailed Dean to ask what attribution would be
* >appropriate, and here is his response:
* >
* >>Mark,
* >>I think it's great that you've ported the macros; consider them
* >>public domain, to do with whatever you wish. I hope you find them >useful .
* >>
* >>Cheers!
* >>- Dean
*/
#ifndef ARM_ATOMIC_H
#define ARM_ATOMIC_H
static __inline__ uint32_t __get_primask(void) {
uint32_t primask = 0;
__asm__ volatile ("MRS %[result], PRIMASK\n\t" : [result]"=r"(primask)::);
return primask;
} // returns 0 if interrupts enabled, 1 if disabled
static __inline__ void __set_primask(uint32_t setval) {
__asm__ volatile ("MSR PRIMASK, %[value]\n\t""dmb\n\t""dsb\n\t""isb\n\t"::[value]"r"(setval) :);
__asm__ volatile ("" :: : "memory");
}
static __inline__ uint32_t __iSeiRetVal(void) {
__asm__ volatile ("CPSIE i\n\t""dmb\n\t""dsb\n\t""isb\n\t");
__asm__ volatile ("" :: : "memory");
return 1;
}
static __inline__ uint32_t __iCliRetVal(void) {
__asm__ volatile ("CPSID i\n\t""dmb\n\t""dsb\n\t""isb\n\t");
__asm__ volatile ("" :: : "memory");
return 1;
}
static __inline__ void __iSeiParam(const uint32_t *__s) {
__asm__ volatile ("CPSIE i\n\t""dmb\n\t""dsb\n\t""isb\n\t");
__asm__ volatile ("" :: : "memory");
(void)__s;
}
static __inline__ void __iCliParam(const uint32_t *__s) {
__asm__ volatile ("CPSID i\n\t""dmb\n\t""dsb\n\t""isb\n\t");
__asm__ volatile ("" :: : "memory");
(void)__s;
}
static __inline__ void __iRestore(const uint32_t *__s) {
__set_primask(*__s);
__asm__ volatile ("dmb\n\t""dsb\n\t""isb\n\t");
__asm__ volatile ("" :: : "memory");
}
#define ATOMIC_BLOCK(type) \
for ( type, __ToDo = __iCliRetVal(); __ToDo ; __ToDo = 0 )
#define ATOMIC_RESTORESTATE \
uint32_t primask_save __attribute__((__cleanup__(__iRestore))) = __get_primask()
#define ATOMIC_FORCEON \
uint32_t primask_save __attribute__((__cleanup__(__iSeiParam))) = 0
#define NONATOMIC_BLOCK(type) \
for ( type, __ToDo = __iSeiRetVal(); __ToDo ; __ToDo = 0 )
#define NONATOMIC_RESTORESTATE \
uint32_t primask_save __attribute__((__cleanup__(__iRestore))) = __get_primask()
#define NONATOMIC_FORCEOFF \
uint32_t primask_save __attribute__((__cleanup__(__iCliParam))) = 0
#endif /* ARM_ATOMIC_H */