controller/Lib/atomic.h at master · kiibohd/controller · GitHub

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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.
 * Modifications 2017 Jacob Alexander
 *
 * 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
 */

#pragma once

// ----- Includes -----

#include <stdint.h>


// ----- Defines -----

#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


// ----- Functions -----

// returns 0 if interrupts enabled, 1 if disabled
static __inline__ uint32_t __get_primask()
{
	uint32_t primask = 0;
	__asm__ volatile ("MRS %[result], PRIMASK\n\t":[result]"=r"(primask)::);
	return primask;
}

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()
{
	__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()
{
	__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");
}