diff options
Diffstat (limited to 'src/inc/cpu.h')
| -rw-r--r-- | src/inc/cpu.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/inc/cpu.h b/src/inc/cpu.h index b8897de..092fd3f 100644 --- a/src/inc/cpu.h +++ b/src/inc/cpu.h @@ -14,4 +14,12 @@ void outb(u16 port, u8 data); void outw(u16 port, u16 data); void outl(u16 port, u32 data); +static inline void spinlock(int *ptr) +{ + int prev; + do + __asm__ volatile("lock xchgl %0,%1" : "=a"(prev) : "m"(*ptr), "a"(1)); + while (prev); +} + #endif |