72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*
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* This is port of Dean Camera's ATOMIC_BLOCK macros for AVR to ARM Cortex M3
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* v1.0
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* Mark Pendrith, Nov 27, 2012.
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*
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* From Mark:
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* >When I ported the macros I emailed Dean to ask what attribution would be
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* >appropriate, and here is his response:
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* >
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* >>Mark,
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* >>I think it's great that you've ported the macros; consider them
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* >>public domain, to do with whatever you wish. I hope you find them >useful .
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* >>
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* >>Cheers!
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* >>- Dean
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*/
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#ifdef __arm__
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#ifndef _CORTEX_M3_ATOMIC_H_
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#define _CORTEX_M3_ATOMIC_H_
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static __inline__ uint32_t __get_primask(void) \
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{ uint32_t primask = 0; \
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__asm__ volatile ("MRS %[result], PRIMASK\n\t":[result]"=r"(primask)::); \
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return primask; } // returns 0 if interrupts enabled, 1 if disabled
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static __inline__ void __set_primask(uint32_t setval) \
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{ __asm__ volatile ("MSR PRIMASK, %[value]\n\t""dmb\n\t""dsb\n\t""isb\n\t"::[value]"r"(setval):);
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__asm__ volatile ("" ::: "memory");}
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static __inline__ uint32_t __iSeiRetVal(void) \
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{ __asm__ volatile ("CPSIE i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
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__asm__ volatile ("" ::: "memory"); return 1; }
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static __inline__ uint32_t __iCliRetVal(void) \
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{ __asm__ volatile ("CPSID i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
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__asm__ volatile ("" ::: "memory"); return 1; }
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static __inline__ void __iSeiParam(const uint32_t *__s) \
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{ __asm__ volatile ("CPSIE i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
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__asm__ volatile ("" ::: "memory"); (void)__s; }
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static __inline__ void __iCliParam(const uint32_t *__s) \
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{ __asm__ volatile ("CPSID i\n\t""dmb\n\t""dsb\n\t""isb\n\t"); \
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__asm__ volatile ("" ::: "memory"); (void)__s; }
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static __inline__ void __iRestore(const uint32_t *__s) \
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{ __set_primask(*__s); __asm__ volatile ("dmb\n\t""dsb\n\t""isb\n\t"); \
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__asm__ volatile ("" ::: "memory"); }
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#define ATOMIC_BLOCK(type) \
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for ( type, __ToDo = __iCliRetVal(); __ToDo ; __ToDo = 0 )
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#define ATOMIC_RESTORESTATE \
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uint32_t primask_save __attribute__((__cleanup__(__iRestore))) = __get_primask()
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#define ATOMIC_FORCEON \
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uint32_t primask_save __attribute__((__cleanup__(__iSeiParam))) = 0
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#define NONATOMIC_BLOCK(type) \
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for ( type, __ToDo = __iSeiRetVal(); __ToDo ; __ToDo = 0 )
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#define NONATOMIC_RESTORESTATE \
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uint32_t primask_save __attribute__((__cleanup__(__iRestore))) = __get_primask()
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#define NONATOMIC_FORCEOFF \
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uint32_t primask_save __attribute__((__cleanup__(__iCliParam))) = 0
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#endif
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#endif
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