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[CM3] Add core interrupt masking for easy creation of atomic blocks

This commit is contained in:
Frantisek Burian 2013-09-11 09:33:45 -07:00 committed by Piotr Esden-Tempski
parent 5c14780403
commit 065b47f8ba
1 changed files with 49 additions and 2 deletions
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51
include/libopencm3/cm3/cortex.h
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@ -22,12 +22,59 @@
static inline void cm_enable_interrupts(void)
{
__asm__("CPSIE I\n");
__asm__("CPSIE I\n");
}
static inline void cm_disable_interrupts(void)
{
__asm__("CPSID I\n");
__asm__("CPSID I\n");
}
static inline void cm_enable_faults(void)
{
__asm__("CPSIE F\n");
}
static inline void cm_disable_faults(void)
{
__asm__("CPSID F\n");
}
/* __attribute__(( always_inline )) */
static inline bool cm_is_masked_interrupts(void)
{
register uint32_t result;
__asm__ ("MRS %0, PRIMASK" : "=r" (result) );
return (result);
}
/* __attribute__(( always_inline )) */
static inline bool cm_is_masked_faults(void)
{
register uint32_t result;
__asm__ ("MRS %0, FAULTMASK" : "=r" (result) );
return (result);
}
/* __attribute__(( always_inline )) */
static inline bool cm_mask_interrupts(bool mask)
{
register bool old;
__asm__ __volatile__("MRS %0, PRIMASK" : "=r" (old));
__asm__ __volatile__("" ::: "memory");
__asm__ __volatile__("MSR PRIMASK, %0" : : "r" (mask));
return old;
}
/* __attribute__(( always_inline )) */
static inline bool cm_mask_faults(bool mask)
{
register bool old;
__asm__ __volatile__ ("MRS %0, FAULTMASK" : "=r" (old));
__asm__ __volatile__("" ::: "memory");
__asm__ __volatile__ ("MSR FAULTMASK, %0" : : "r" (mask));
return old;
}
#endif