| 30,6 → 30,8 |
|---|
| #define __ia32_ATOMIC_H__ |
| |
| #include <arch/types.h> |
| #include <arch/barrier.h> |
| #include <preemption.h> |
| |
| typedef struct { volatile __u32 count; } atomic_t; |
| |
| 100,7 → 102,31 |
|---|
| return v; |
| } |
| |
| /** Ia32 specific fast spinlock */ |
| static inline void atomic_lock_arch(atomic_t *val) |
| { |
| __u32 tmp; |
| |
| extern void spinlock_arch(volatile int *val); |
| preemption_disable(); |
| __asm__ volatile ( |
| "0:;" |
| #ifdef CONFIG_HT |
| "pause;" /* Pentium 4's HT love this instruction */ |
| #endif |
| "mov %0, %1;" |
| "testl %1, %1;" |
| "jnz 0b;" /* Leightweight looping on locked spinlock */ |
| |
| "incl %1;" /* now use the atomic operation */ |
| "xchgl %0, %1;" |
| "testl %1, %1;" |
| "jnz 0b;" |
| : "=m"(val->count),"=r"(tmp) |
| ); |
| /* |
| * Prevent critical section code from bleeding out this way up. |
| */ |
| CS_ENTER_BARRIER(); |
| } |
| |
| #endif |