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#ifndef __ASM_METAG_ATOMIC_LNKGET_H
#define __ASM_METAG_ATOMIC_LNKGET_H
#define ATOMIC_INIT(i) { (i) }
#define atomic_set(v, i) WRITE_ONCE((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), "br" (i) \
: "cc"); \
\
smp_mb(); \
\
return result; \
}
#define ATOMIC_FETCH_OP(op) \
static inline int atomic_fetch_##op(int i, atomic_t *v) \
{ \
int result, temp; \
\
smp_mb(); \
\
asm volatile ( \
"1: LNKGETD %1, [%2]\n" \
" " #op " %0, %1, %3\n" \
" LNKSETD [%2], %0\n" \
" DEFR %0, TXSTAT\n" \
" ANDT %0, %0, #HI(0x3f000000)\n" \
" CMPT %0, #HI(0x02000000)\n" \
" BNZ 1b\n" \
: "=&d" (temp), "=&d" (result) \
: "da" (&v->counter), "bd" (i) \
: "cc"); \
\
smp_mb(); \
\
return result; \
}
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
ATOMIC_OPS(add)
ATOMIC_OPS(sub)
#undef ATOMIC_OPS
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
ATOMIC_OPS(and)
ATOMIC_OPS(or)
ATOMIC_OPS(xor)
#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
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 */
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