Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | #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_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
ATOMIC_OPS(add)
ATOMIC_OPS(sub)
ATOMIC_OP(and)
ATOMIC_OP(or)
ATOMIC_OP(xor)
#undef ATOMIC_OPS
#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 */
|