softirq.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:1k
- #ifndef __ASM_SOFTIRQ_H
- #define __ASM_SOFTIRQ_H
- #include <asm/atomic.h>
- #include <asm/hardirq.h>
- #define __cpu_bh_enable(cpu)
- do { barrier(); local_bh_count(cpu)--; } while (0)
- #define cpu_bh_disable(cpu)
- do { local_bh_count(cpu)++; barrier(); } while (0)
- #define local_bh_disable() cpu_bh_disable(smp_processor_id())
- #define __local_bh_enable() __cpu_bh_enable(smp_processor_id())
- #define in_softirq() (local_bh_count(smp_processor_id()) != 0)
- /*
- * NOTE: this assembly code assumes:
- *
- * (char *)&local_bh_count - 8 == (char *)&softirq_pending
- *
- * If you change the offsets in irq_stat then you have to
- * update this code as well.
- */
- #define local_bh_enable()
- do {
- unsigned int *ptr = &local_bh_count(smp_processor_id());
-
- barrier();
- if (!--*ptr)
- __asm__ __volatile__ (
- "cmpl $0, -8(%0);"
- "jnz 2f;"
- "1:;"
-
- LOCK_SECTION_START("")
- "2: pushl %%eax; pushl %%ecx; pushl %%edx;"
- "call %c1;"
- "popl %%edx; popl %%ecx; popl %%eax;"
- "jmp 1b;"
- LOCK_SECTION_END
-
- : /* no output */
- : "r" (ptr), "i" (do_softirq)
- /* no registers clobbered */ );
- } while (0)
- #endif /* __ASM_SOFTIRQ_H */