From 1315596b510189b5159e742110b504177bdd4932 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Thu, 21 Jan 2016 19:08:54 +0000 Subject: refactor internal atomic.h 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. --- arch/aarch64/atomic.h | 206 -------------------------------------------------- 1 file changed, 206 deletions(-) delete mode 100644 arch/aarch64/atomic.h (limited to 'arch/aarch64/atomic.h') diff --git a/arch/aarch64/atomic.h b/arch/aarch64/atomic.h deleted file mode 100644 index e7c82c2e..00000000 --- a/arch/aarch64/atomic.h +++ /dev/null @@ -1,206 +0,0 @@ -#ifndef _INTERNAL_ATOMIC_H -#define _INTERNAL_ATOMIC_H - -#include - -static inline int a_ctz_64(uint64_t x) -{ - __asm__( - " rbit %0, %1\n" - " clz %0, %0\n" - : "=r"(x) : "r"(x)); - return x; -} - -static inline int a_ctz_l(unsigned long x) -{ - return a_ctz_64(x); -} - -static inline void a_barrier() -{ - __asm__ __volatile__("dmb ish"); -} - -static inline void *a_cas_p(volatile void *p, void *t, void *s) -{ - void *old; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %0,%3\n" - " cmp %0,%1\n" - " b.ne 1f\n" - " stxr %w0,%2,%3\n" - " cbnz %w0,1b\n" - " mov %0,%1\n" - "1: dmb ish\n" - : "=&r"(old) - : "r"(t), "r"(s), "Q"(*(long*)p) - : "memory", "cc"); - return old; -} - -static inline int a_cas(volatile int *p, int t, int s) -{ - int old; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%3\n" - " cmp %w0,%w1\n" - " b.ne 1f\n" - " stxr %w0,%w2,%3\n" - " cbnz %w0,1b\n" - " mov %w0,%w1\n" - "1: dmb ish\n" - : "=&r"(old) - : "r"(t), "r"(s), "Q"(*p) - : "memory", "cc"); - return old; -} - -static inline int a_swap(volatile int *x, int v) -{ - int old, tmp; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%3\n" - " stxr %w1,%w2,%3\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(old), "=&r"(tmp) - : "r"(v), "Q"(*x) - : "memory", "cc" ); - return old; -} - -static inline int a_fetch_add(volatile int *x, int v) -{ - int old, tmp; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%3\n" - " add %w0,%w0,%w2\n" - " stxr %w1,%w0,%3\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(old), "=&r"(tmp) - : "r"(v), "Q"(*x) - : "memory", "cc" ); - return old-v; -} - -static inline void a_inc(volatile int *x) -{ - int tmp, tmp2; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%2\n" - " add %w0,%w0,#1\n" - " stxr %w1,%w0,%2\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(tmp), "=&r"(tmp2) - : "Q"(*x) - : "memory", "cc" ); -} - -static inline void a_dec(volatile int *x) -{ - int tmp, tmp2; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%2\n" - " sub %w0,%w0,#1\n" - " stxr %w1,%w0,%2\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(tmp), "=&r"(tmp2) - : "Q"(*x) - : "memory", "cc" ); -} - -static inline void a_and_64(volatile uint64_t *p, uint64_t v) -{ - int tmp, tmp2; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %0,%3\n" - " and %0,%0,%2\n" - " stxr %w1,%0,%3\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(tmp), "=&r"(tmp2) - : "r"(v), "Q"(*p) - : "memory", "cc" ); -} - -static inline void a_and(volatile int *p, int v) -{ - int tmp, tmp2; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%3\n" - " and %w0,%w0,%w2\n" - " stxr %w1,%w0,%3\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(tmp), "=&r"(tmp2) - : "r"(v), "Q"(*p) - : "memory", "cc" ); -} - -static inline void a_or_64(volatile uint64_t *p, uint64_t v) -{ - int tmp, tmp2; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %0,%3\n" - " orr %0,%0,%2\n" - " stxr %w1,%0,%3\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(tmp), "=&r"(tmp2) - : "r"(v), "Q"(*p) - : "memory", "cc" ); -} - -static inline void a_or_l(volatile void *p, long v) -{ - return a_or_64(p, v); -} - -static inline void a_or(volatile int *p, int v) -{ - int tmp, tmp2; - __asm__ __volatile__( - " dmb ish\n" - "1: ldxr %w0,%3\n" - " orr %w0,%w0,%w2\n" - " stxr %w1,%w0,%3\n" - " cbnz %w1,1b\n" - " dmb ish\n" - : "=&r"(tmp), "=&r"(tmp2) - : "r"(v), "Q"(*p) - : "memory", "cc" ); -} - -static inline void a_store(volatile int *p, int x) -{ - __asm__ __volatile__( - " dmb ish\n" - " str %w1,%0\n" - " dmb ish\n" - : "=m"(*p) - : "r"(x) - : "memory", "cc" ); -} - -#define a_spin a_barrier - -static inline void a_crash() -{ - *(volatile char *)0=0; -} - - -#endif -- cgit v1.2.1