diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/include/asm-xeno/softirq.h')
| -rw-r--r-- | xenolinux-2.4.21-pre4-sparse/include/asm-xeno/softirq.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/softirq.h b/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/softirq.h new file mode 100644 index 0000000000..b9f7796b29 --- /dev/null +++ b/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/softirq.h @@ -0,0 +1,48 @@ +#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 */ |