diff options
Diffstat (limited to 'kernel/arch/metag/include/asm/atomic_lnkget.h')
| -rw-r--r-- | kernel/arch/metag/include/asm/atomic_lnkget.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/kernel/arch/metag/include/asm/atomic_lnkget.h b/kernel/arch/metag/include/asm/atomic_lnkget.h new file mode 100644 index 000000000..948d86886 --- /dev/null +++ b/kernel/arch/metag/include/asm/atomic_lnkget.h @@ -0,0 +1,205 @@ +#ifndef __ASM_METAG_ATOMIC_LNKGET_H +#define __ASM_METAG_ATOMIC_LNKGET_H + +#define ATOMIC_INIT(i) { (i) } + +#define atomic_set(v, i) ((v)->counter = (i)) + +#include <linux/compiler.h> + +#include <asm/barrier.h> + +/* + * None of these asm statements clobber memory as LNKSET writes around + * the cache so the memory it modifies cannot safely be read by any means + * other than these accessors. + */ + +static inline int atomic_read(const atomic_t *v) +{ + int temp; + + asm volatile ( + "LNKGETD %0, [%1]\n" + : "=da" (temp) + : "da" (&v->counter)); + + return temp; +} + +#define ATOMIC_OP(op) \ +static inline void atomic_##op(int i, atomic_t *v) \ +{ \ + int temp; \ + \ + asm volatile ( \ + "1: LNKGETD %0, [%1]\n" \ + " " #op " %0, %0, %2\n" \ + " LNKSETD [%1], %0\n" \ + " DEFR %0, TXSTAT\n" \ + " ANDT %0, %0, #HI(0x3f000000)\n" \ + " CMPT %0, #HI(0x02000000)\n" \ + " BNZ 1b\n" \ + : "=&d" (temp) \ + : "da" (&v->counter), "bd" (i) \ + : "cc"); \ +} \ + +#define ATOMIC_OP_RETURN(op) \ +static inline int atomic_##op##_return(int i, atomic_t *v) \ +{ \ + int result, temp; \ + \ + smp_mb(); \ + \ + asm volatile ( \ + "1: LNKGETD %1, [%2]\n" \ + " " #op " %1, %1, %3\n" \ + " LNKSETD [%2], %1\n" \ + " DEFR %0, TXSTAT\n" \ + " ANDT %0, %0, #HI(0x3f000000)\n" \ + " CMPT %0, #HI(0x02000000)\n" \ + " BNZ 1b\n" \ + : "=&d" (temp), "=&da" (result) \ + : "da" (&v->counter), "bd" (i) \ + : "cc"); \ + \ + smp_mb(); \ + \ + return result; \ +} + +#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) + +ATOMIC_OPS(add) +ATOMIC_OPS(sub) + +#undef ATOMIC_OPS +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP + +static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) +{ + int temp; + + asm volatile ( + "1: LNKGETD %0, [%1]\n" + " AND %0, %0, %2\n" + " LNKSETD [%1] %0\n" + " DEFR %0, TXSTAT\n" + " ANDT %0, %0, #HI(0x3f000000)\n" + " CMPT %0, #HI(0x02000000)\n" + " BNZ 1b\n" + : "=&d" (temp) + : "da" (&v->counter), "bd" (~mask) + : "cc"); +} + +static inline void atomic_set_mask(unsigned int mask, atomic_t *v) +{ + int temp; + + asm volatile ( + "1: LNKGETD %0, [%1]\n" + " OR %0, %0, %2\n" + " LNKSETD [%1], %0\n" + " DEFR %0, TXSTAT\n" + " ANDT %0, %0, #HI(0x3f000000)\n" + " CMPT %0, #HI(0x02000000)\n" + " BNZ 1b\n" + : "=&d" (temp) + : "da" (&v->counter), "bd" (mask) + : "cc"); +} + +static inline int atomic_cmpxchg(atomic_t *v, int old, int new) +{ + int result, temp; + + smp_mb(); + + asm volatile ( + "1: LNKGETD %1, [%2]\n" + " CMP %1, %3\n" + " LNKSETDEQ [%2], %4\n" + " BNE 2f\n" + " DEFR %0, TXSTAT\n" + " ANDT %0, %0, #HI(0x3f000000)\n" + " CMPT %0, #HI(0x02000000)\n" + " BNZ 1b\n" + "2:\n" + : "=&d" (temp), "=&d" (result) + : "da" (&v->counter), "bd" (old), "da" (new) + : "cc"); + + smp_mb(); + + return result; +} + +static inline int atomic_xchg(atomic_t *v, int new) +{ + int temp, old; + + asm volatile ( + "1: LNKGETD %1, [%2]\n" + " LNKSETD [%2], %3\n" + " DEFR %0, TXSTAT\n" + " ANDT %0, %0, #HI(0x3f000000)\n" + " CMPT %0, #HI(0x02000000)\n" + " BNZ 1b\n" + : "=&d" (temp), "=&d" (old) + : "da" (&v->counter), "da" (new) + : "cc"); + + return old; +} + +static inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + int result, temp; + + smp_mb(); + + asm volatile ( + "1: LNKGETD %1, [%2]\n" + " CMP %1, %3\n" + " ADD %0, %1, %4\n" + " LNKSETDNE [%2], %0\n" + " BEQ 2f\n" + " DEFR %0, TXSTAT\n" + " ANDT %0, %0, #HI(0x3f000000)\n" + " CMPT %0, #HI(0x02000000)\n" + " BNZ 1b\n" + "2:\n" + : "=&d" (temp), "=&d" (result) + : "da" (&v->counter), "bd" (u), "bd" (a) + : "cc"); + + smp_mb(); + + return result; +} + +static inline int atomic_sub_if_positive(int i, atomic_t *v) +{ + int result, temp; + + asm volatile ( + "1: LNKGETD %1, [%2]\n" + " SUBS %1, %1, %3\n" + " LNKSETDGE [%2], %1\n" + " BLT 2f\n" + " DEFR %0, TXSTAT\n" + " ANDT %0, %0, #HI(0x3f000000)\n" + " CMPT %0, #HI(0x02000000)\n" + " BNZ 1b\n" + "2:\n" + : "=&d" (temp), "=&da" (result) + : "da" (&v->counter), "bd" (i) + : "cc"); + + return result; +} + +#endif /* __ASM_METAG_ATOMIC_LNKGET_H */ |