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asm/irqflags: fix documentation and simplify

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This commit is contained in:
daniel-k 2016-08-29 18:20:28 +02:00
parent 047dbfd56f
commit 321d86b466
1 changed files with 44 additions and 43 deletions
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87
hermit/arch/x86/include/asm/irqflags.h
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@ -41,54 +41,12 @@
extern "C" {
#endif
/** @brief Disable IRQs
*
* This inline function just clears out the interrupt bit
*/
inline static void irq_disable(void) {
asm volatile("cli" ::: "memory");
}
/** @brief Disable IRQs (nested)
*
* Disable IRQs when unsure if IRQs were enabled at all.\n
* This function together with irq_nested_enable can be used
* in situations when interrupts shouldn't be activated if they
* were not activated before calling this function.
*
* @return The set of flags which have been set until now
*/
inline static uint8_t irq_nested_disable(void) {
size_t flags;
asm volatile("pushf; cli; pop %0": "=r"(flags) : : "memory");
if (flags & (1 << 9))
return 1;
return 0;
}
/** @brief Enable IRQs */
inline static void irq_enable(void) {
asm volatile("sti" ::: "memory");
}
/** @brief Enable IRQs (nested)
*
* If called after calling irq_nested_disable, this function will
* not activate IRQs if they were not active before.
*
* @param flags Flags to set. Could be the old ones you got from irq_nested_disable.
*/
inline static void irq_nested_enable(uint8_t flags) {
if (flags)
irq_enable();
}
/** @brief Determines, if the interrupt flags (IF) is set
*
* @return
* - 1 interrupt flag is set
* - 0 interrupt flag is cleared
*/
*/
inline static uint8_t is_irq_enabled(void)
{
size_t flags;
@ -98,6 +56,49 @@ inline static uint8_t is_irq_enabled(void)
return 0;
}
/** @brief Disable IRQs
*
* This inline function just clears out the interrupt bit
*/
inline static void irq_disable(void) {
asm volatile("cli" ::: "memory");
}
/** @brief Enable IRQs
*
* This inline function just sets the interrupt bit
*/
inline static void irq_enable(void) {
asm volatile("sti" ::: "memory");
}
/** @brief Disable IRQs (nested)
*
* Disable IRQs when unsure if IRQs were enabled at all.
* This function together with irq_nested_enable can be used
* in situations when interrupts shouldn't be activated if they
* were not activated before calling this function.
*
* @return Whether IRQs had been enabled or not before disabling
*/
inline static uint8_t irq_nested_disable(void) {
uint8_t was_enabled = is_irq_enabled();
irq_disable();
return was_enabled;
}
/** @brief Enable IRQs (nested)
*
* Can be used in conjunction with irq_nested_disable() to only enable
* interrupts again if they were enabled before.
*
* @param was_enabled Whether IRQs should be enabled or not
*/
inline static void irq_nested_enable(uint8_t was_enabled) {
if (was_enabled)
irq_enable();
}
#ifdef __cplusplus
}
#endif