libavr32: arch/avr32/include/arch/softirq.h Source File

00001 
00041 #ifndef ARCH_SOFTIRQ_H_INCLUDED
00042 #define ARCH_SOFTIRQ_H_INCLUDED
00043 
00044 #include <bitops.h>
00045 #include <compiler.h>
00046 #include <arch/sysreg.h>
00047 
00052 typedef void (*softirq_handler_t)(void *data);
00053 
00054 extern unsigned long softirq_priv_status;
00055 
00056 extern void softirq_set_handler(unsigned int id,
00057                 softirq_handler_t handler, void *data);
00058 extern void softirq_priv_do_pending(void);
00059 extern void softirq_enable(void);
00060 
00067 static inline void softirq_disable(void)
00068 {
00069         avr32_set_sr_bit(SYSREG_SR_T_BIT);
00070         barrier();
00071 }
00072 
00083 static inline void softirq_raise(unsigned int id)
00084 {
00085         atomic_set_bit(id, &softirq_priv_status);
00086 }
00087 
00094 static inline bool softirq_is_enabled_flags(unsigned long flags)
00095 {
00096         return !(flags & SYSREG_SR_T);
00097 }
00098 
00104 static inline bool softirq_is_enabled(void)
00105 {
00106         return softirq_is_enabled_flags(sysreg_read(SR));
00107 }
00108 
00116 static inline unsigned long softirq_save(void)
00117 {
00118         unsigned long flags;
00119 
00120         flags = sysreg_read(SR);
00121         softirq_disable();
00122 
00123         return flags;
00124 }
00125 
00130 static inline void softirq_restore(unsigned long flags)
00131 {
00132         /*
00133          * We can't just write directly to SR as we do for interrupts,
00134          * since we must also check for pending softirqs.
00135          */
00136         if (softirq_is_enabled_flags(flags))
00137                 softirq_enable();
00138 }
00139 
00140 #endif /* ARCH_SOFTIRQ_H_INCLUDED */