diff options
Diffstat (limited to 'cpukit/score/include/rtems/score/isrlevel.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/isrlevel.h | 139 |
1 files changed, 24 insertions, 115 deletions
diff --git a/cpukit/score/include/rtems/score/isrlevel.h b/cpukit/score/include/rtems/score/isrlevel.h index 32263dbab7..35d3d037cc 100644 --- a/cpukit/score/include/rtems/score/isrlevel.h +++ b/cpukit/score/include/rtems/score/isrlevel.h @@ -41,40 +41,46 @@ extern "C" { typedef uint32_t ISR_Level; /** - * @brief Disable interrupts on this core. + * @brief Disables interrupts on this processor. * - * This routine disables all interrupts so that a critical section - * of code can be executing without being interrupted. + * This macro disables all interrupts on this processor so that a critical + * section of code is protected from concurrent access by interrupts of this + * processor. Disabling of interrupts disables thread dispatching on the + * processor as well. * - * @retval The argument @a _level will contain the previous interrupt - * mask level. + * On SMP configurations other processors can enter such sections if not + * protected by other means. + * + * @param[out] _level The argument @a _level will contain the previous + * interrupt mask level. */ -#define _ISR_Disable_on_this_core( _level ) \ +#define _ISR_Disable( _level ) \ do { \ _CPU_ISR_Disable( _level ); \ RTEMS_COMPILER_MEMORY_BARRIER(); \ } while (0) /** - * @brief Enable interrupts on this core. + * @brief Enables interrupts on this processor. * - * This routine enables interrupts to the previous interrupt mask - * LEVEL. It is used at the end of a critical section of code to - * enable interrupts so they can be processed again. + * This macro restores the interrupt status on the processor with the + * interrupt level value obtained by _ISR_Disable(). It is used at the end of + * a critical section of code to enable interrupts so they can be processed + * again. * - * @param[in] _level contains the interrupt level mask level - * previously returned by @ref _ISR_Disable_on_this_core. + * @param[in] _level The interrupt level previously obtained by + * _ISR_Disable(). */ -#define _ISR_Enable_on_this_core( _level ) \ +#define _ISR_Enable( _level ) \ do { \ RTEMS_COMPILER_MEMORY_BARRIER(); \ _CPU_ISR_Enable( _level ); \ } while (0) /** - * @brief Temporarily enable interrupts on this core. + * @brief Temporarily enables interrupts on this processor. * - * This routine temporarily enables interrupts to the previous + * This macro temporarily enables interrupts to the previous * interrupt mask level and then disables all interrupts so that * the caller can continue into the second part of a critical * section. @@ -87,113 +93,16 @@ typedef uint32_t ISR_Level; * must be selected with care to ensure that the critical section * properly protects itself. * - * @param[in] _level contains the interrupt level mask level - * previously returned by @ref _ISR_Disable_on_this_core. + * @param[in] _level The interrupt level previously obtained by + * _ISR_Disable(). */ -#define _ISR_Flash_on_this_core( _level ) \ +#define _ISR_Flash( _level ) \ do { \ RTEMS_COMPILER_MEMORY_BARRIER(); \ _CPU_ISR_Flash( _level ); \ RTEMS_COMPILER_MEMORY_BARRIER(); \ } while (0) -#if defined( RTEMS_SMP ) - -/** - * @brief Enter interrupt critical section on SMP system. - * - * This method is used to enter an interrupt critical section that - * is honored across all cores in an SMP system. - * - * @retval This method returns the previous interrupt mask level. - */ -ISR_Level _ISR_SMP_Disable(void); - -/** - * @brief Exit interrupt critical section on SMP system. - * - * This method is used to exit an interrupt critical section that - * is honored across all cores in an SMP system. - * - * @param[in] level contains the interrupt level mask level - * previously returned by @ref _ISR_SMP_Disable. - */ -void _ISR_SMP_Enable(ISR_Level level); - -/** - * @brief Temporarily exit interrupt critical section on SMP system. - * - * This method is used to temporarily exit an interrupt critical section - * that is honored across all cores in an SMP system. - * - * @param[in] level contains the interrupt level mask level - * previously returned by @ref _ISR_SMP_Disable. - */ -void _ISR_SMP_Flash(ISR_Level level); - -#endif /* defined( RTEMS_SMP ) */ - -/** - * @brief Enter interrupt disable critical section. - * - * This routine enters an interrupt disable critical section. When - * in an SMP configuration, this involves obtaining a spinlock to ensure - * that only one core is inside an interrupt disable critical section. - * When on a single core system, this only involves disabling local - * CPU interrupts. - * - * @retval The argument @a _level will contain the previous interrupt - * mask level. - */ -#if defined( RTEMS_SMP ) - #define _ISR_Disable( _level ) \ - _level = _ISR_SMP_Disable(); -#else - #define _ISR_Disable( _level ) \ - _ISR_Disable_on_this_core( _level ); -#endif - -/** - * @brief Exits interrupt disable critical section. - * - * This routine exits an interrupt disable critical section. When - * in an SMP configuration, this involves releasing a spinlock. - * When on a single core system, this only involves disabling local - * CPU interrupts. - * - * @retval The argument @a _level will contain the previous interrupt - * mask level. - */ -#if defined( RTEMS_SMP ) - #define _ISR_Enable( _level ) \ - _ISR_SMP_Enable( _level ); -#else - #define _ISR_Enable( _level ) \ - _ISR_Enable_on_this_core( _level ); -#endif - -/** - * @brief Temporarily exit interrupt disable critical section. - * - * This routine is used to temporarily enable interrupts - * during a long critical section. It is used in long sections of - * critical code when a point is reached at which interrupts can - * be temporarily enabled. Deciding where to flash interrupts - * in a long critical section is often difficult and the point - * must be selected with care to ensure that the critical section - * properly protects itself. - * - * @retval The argument @a _level will contain the previous interrupt - * mask level. - */ -#if defined( RTEMS_SMP ) - #define _ISR_Flash( _level ) \ - _ISR_SMP_Flash( _level ); -#else - #define _ISR_Flash( _level ) \ - _ISR_Flash_on_this_core( _level ); -#endif - /** * @brief Return current interrupt level. * |