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refactor internal atomic.h

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rather than having each arch provide its own atomic.h, there is a new
shared atomic.h in src/internal which pulls arch-specific definitions
from arc/$(ARCH)/atomic_arch.h. the latter can be extremely minimal,
defining only a_cas or new ll/sc type primitives which the shared
atomic.h will use to construct everything else.

this commit avoids making heavy changes to the individual archs'
atomic implementations. definitions which are identical or
near-identical to what the new shared atomic.h would produce have been
removed, but otherwise the changes made are just hooking up the
arch-specific files to the new infrastructure. major changes to take
advantage of the new system will come in subsequent commits.
This commit is contained in:
Rich Felker
2016-01-21 19:08:54 +00:00
parent ce3e24eaae
commit 1315596b51
15 changed files with 491 additions and 834 deletions
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120
arch/or1k/atomic.h
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@@ -1,120 +0,0 @@
#ifndef _INTERNAL_ATOMIC_H
#define _INTERNAL_ATOMIC_H
#include <stdint.h>
static inline int a_ctz_l(unsigned long x)
{
static const char debruijn32[32] = {
0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
};
return debruijn32[(x&-x)*0x076be629 >> 27];
}
static inline int a_ctz_64(uint64_t x)
{
uint32_t y = x;
if (!y) {
y = x>>32;
return 32 + a_ctz_l(y);
}
return a_ctz_l(y);
}
static inline int a_cas(volatile int *p, int t, int s)
{
__asm__("1: l.lwa %0, %1\n"
" l.sfeq %0, %2\n"
" l.bnf 1f\n"
" l.nop\n"
" l.swa %1, %3\n"
" l.bnf 1b\n"
" l.nop\n"
"1: \n"
: "=&r"(t), "+m"(*p) : "r"(t), "r"(s) : "cc", "memory" );
return t;
}
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
return (void *)a_cas(p, (int)t, (int)s);
}
static inline int a_swap(volatile int *x, int v)
{
int old;
do old = *x;
while (a_cas(x, old, v) != old);
return old;
}
static inline int a_fetch_add(volatile int *x, int v)
{
int old;
do old = *x;
while (a_cas(x, old, old+v) != old);
return old;
}
static inline void a_inc(volatile int *x)
{
a_fetch_add(x, 1);
}
static inline void a_dec(volatile int *x)
{
a_fetch_add(x, -1);
}
static inline void a_store(volatile int *p, int x)
{
a_swap(p, x);
}
#define a_spin a_barrier
static inline void a_barrier()
{
a_cas(&(int){0}, 0, 0);
}
static inline void a_crash()
{
*(volatile char *)0=0;
}
static inline void a_and(volatile int *p, int v)
{
int old;
do old = *p;
while (a_cas(p, old, old&v) != old);
}
static inline void a_or(volatile int *p, int v)
{
int old;
do old = *p;
while (a_cas(p, old, old|v) != old);
}
static inline void a_or_l(volatile void *p, long v)
{
a_or(p, v);
}
static inline void a_and_64(volatile uint64_t *p, uint64_t v)
{
union { uint64_t v; uint32_t r[2]; } u = { v };
a_and((int *)p, u.r[0]);
a_and((int *)p+1, u.r[1]);
}
static inline void a_or_64(volatile uint64_t *p, uint64_t v)
{
union { uint64_t v; uint32_t r[2]; } u = { v };
a_or((int *)p, u.r[0]);
a_or((int *)p+1, u.r[1]);
}
#endif

14
arch/or1k/atomic_arch.h Normal file
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@@ -0,0 +1,14 @@
#define a_cas a_cas
static inline int a_cas(volatile int *p, int t, int s)
{
__asm__("1: l.lwa %0, %1\n"
" l.sfeq %0, %2\n"
" l.bnf 1f\n"
" l.nop\n"
" l.swa %1, %3\n"
" l.bnf 1b\n"
" l.nop\n"
"1: \n"
: "=&r"(t), "+m"(*p) : "r"(t), "r"(s) : "cc", "memory" );
return t;
}