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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/metag/include/asm/irqflags.h |
Initial import
Diffstat (limited to 'arch/metag/include/asm/irqflags.h')
-rw-r--r-- | arch/metag/include/asm/irqflags.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/metag/include/asm/irqflags.h b/arch/metag/include/asm/irqflags.h new file mode 100644 index 000000000..339b16f06 --- /dev/null +++ b/arch/metag/include/asm/irqflags.h @@ -0,0 +1,93 @@ +/* + * IRQ flags handling + * + * This file gets included from lowlevel asm headers too, to provide + * wrapped versions of the local_irq_*() APIs, based on the + * raw_local_irq_*() functions from the lowlevel headers. + */ +#ifndef _ASM_IRQFLAGS_H +#define _ASM_IRQFLAGS_H + +#ifndef __ASSEMBLY__ + +#include <asm/core_reg.h> +#include <asm/metag_regs.h> + +#define INTS_OFF_MASK TXSTATI_BGNDHALT_BIT + +#ifdef CONFIG_SMP +extern unsigned int get_trigger_mask(void); +#else + +extern unsigned int global_trigger_mask; + +static inline unsigned int get_trigger_mask(void) +{ + return global_trigger_mask; +} +#endif + +static inline unsigned long arch_local_save_flags(void) +{ + return __core_reg_get(TXMASKI); +} + +static inline int arch_irqs_disabled_flags(unsigned long flags) +{ + return (flags & ~INTS_OFF_MASK) == 0; +} + +static inline int arch_irqs_disabled(void) +{ + unsigned long flags = arch_local_save_flags(); + + return arch_irqs_disabled_flags(flags); +} + +static inline unsigned long __irqs_disabled(void) +{ + /* + * We shouldn't enable exceptions if they are not already + * enabled. This is required for chancalls to work correctly. + */ + return arch_local_save_flags() & INTS_OFF_MASK; +} + +/* + * For spinlocks, etc: + */ +static inline unsigned long arch_local_irq_save(void) +{ + unsigned long flags = __irqs_disabled(); + + asm volatile("SWAP %0,TXMASKI\n" : "=r" (flags) : "0" (flags) + : "memory"); + + return flags; +} + +static inline void arch_local_irq_restore(unsigned long flags) +{ + asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory"); +} + +static inline void arch_local_irq_disable(void) +{ + unsigned long flags = __irqs_disabled(); + + asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory"); +} + +#ifdef CONFIG_SMP +/* Avoid circular include dependencies through <linux/preempt.h> */ +void arch_local_irq_enable(void); +#else +static inline void arch_local_irq_enable(void) +{ + arch_local_irq_restore(get_trigger_mask()); +} +#endif + +#endif /* (__ASSEMBLY__) */ + +#endif /* !(_ASM_IRQFLAGS_H) */ |