diff options
Diffstat (limited to 'sys/linux/riscv64/arch/atomic.h')
-rw-r--r-- | sys/linux/riscv64/arch/atomic.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sys/linux/riscv64/arch/atomic.h b/sys/linux/riscv64/arch/atomic.h new file mode 100644 index 0000000..95db16d --- /dev/null +++ b/sys/linux/riscv64/arch/atomic.h @@ -0,0 +1,38 @@ +static inline void +atomic·barrier() +{ + __asm__ __volatile__ ("fence rw,rw" : : : "memory"); +} + +static inline int +atomic·cas(volatile int *p, int t, int s) +{ + int old, tmp; + __asm__ __volatile__ ( + "\n1: lr.w.aqrl %0, (%2)\n" + " bne %0, %3, 1f\n" + " sc.w.aqrl %1, %4, (%2)\n" + " bnez %1, 1b\n" + "1:" + : "=&r"(old), "=&r"(tmp) + : "r"(p), "r"((long)t), "r"((long)s) + : "memory"); + return old; +} + +static inline void +*atomic·casp(volatile void *p, void *t, void *s) +{ + void *old; + int tmp; + __asm__ __volatile__ ( + "\n1: lr.d.aqrl %0, (%2)\n" + " bne %0, %3, 1f\n" + " sc.d.aqrl %1, %4, (%2)\n" + " bnez %1, 1b\n" + "1:" + : "=&r"(old), "=&r"(tmp) + : "r"(p), "r"(t), "r"(s) + : "memory"); + return old; +} |