803f69144f
Disintegrate asm/system.h for M68K. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Greg Ungerer <gerg@uclinux.org> cc: linux-m68k@lists.linux-m68k.org
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
#ifndef __ARCH_M68K_CMPXCHG__
|
|
#define __ARCH_M68K_CMPXCHG__
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
struct __xchg_dummy { unsigned long a[100]; };
|
|
#define __xg(x) ((volatile struct __xchg_dummy *)(x))
|
|
|
|
extern unsigned long __invalid_xchg_size(unsigned long, volatile void *, int);
|
|
|
|
#ifndef CONFIG_RMW_INSNS
|
|
static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
|
|
{
|
|
unsigned long flags, tmp;
|
|
|
|
local_irq_save(flags);
|
|
|
|
switch (size) {
|
|
case 1:
|
|
tmp = *(u8 *)ptr;
|
|
*(u8 *)ptr = x;
|
|
x = tmp;
|
|
break;
|
|
case 2:
|
|
tmp = *(u16 *)ptr;
|
|
*(u16 *)ptr = x;
|
|
x = tmp;
|
|
break;
|
|
case 4:
|
|
tmp = *(u32 *)ptr;
|
|
*(u32 *)ptr = x;
|
|
x = tmp;
|
|
break;
|
|
default:
|
|
tmp = __invalid_xchg_size(x, ptr, size);
|
|
break;
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
return x;
|
|
}
|
|
#else
|
|
static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
|
|
{
|
|
switch (size) {
|
|
case 1:
|
|
__asm__ __volatile__
|
|
("moveb %2,%0\n\t"
|
|
"1:\n\t"
|
|
"casb %0,%1,%2\n\t"
|
|
"jne 1b"
|
|
: "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
|
|
break;
|
|
case 2:
|
|
__asm__ __volatile__
|
|
("movew %2,%0\n\t"
|
|
"1:\n\t"
|
|
"casw %0,%1,%2\n\t"
|
|
"jne 1b"
|
|
: "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
|
|
break;
|
|
case 4:
|
|
__asm__ __volatile__
|
|
("movel %2,%0\n\t"
|
|
"1:\n\t"
|
|
"casl %0,%1,%2\n\t"
|
|
"jne 1b"
|
|
: "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
|
|
break;
|
|
default:
|
|
x = __invalid_xchg_size(x, ptr, size);
|
|
break;
|
|
}
|
|
return x;
|
|
}
|
|
#endif
|
|
|
|
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
|
|
|
|
#include <asm-generic/cmpxchg-local.h>
|
|
|
|
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
|
|
|
|
extern unsigned long __invalid_cmpxchg_size(volatile void *,
|
|
unsigned long, unsigned long, int);
|
|
|
|
/*
|
|
* Atomic compare and exchange. Compare OLD with MEM, if identical,
|
|
* store NEW in MEM. Return the initial value in MEM. Success is
|
|
* indicated by comparing RETURN with OLD.
|
|
*/
|
|
#ifdef CONFIG_RMW_INSNS
|
|
#define __HAVE_ARCH_CMPXCHG 1
|
|
|
|
static inline unsigned long __cmpxchg(volatile void *p, unsigned long old,
|
|
unsigned long new, int size)
|
|
{
|
|
switch (size) {
|
|
case 1:
|
|
__asm__ __volatile__ ("casb %0,%2,%1"
|
|
: "=d" (old), "=m" (*(char *)p)
|
|
: "d" (new), "0" (old), "m" (*(char *)p));
|
|
break;
|
|
case 2:
|
|
__asm__ __volatile__ ("casw %0,%2,%1"
|
|
: "=d" (old), "=m" (*(short *)p)
|
|
: "d" (new), "0" (old), "m" (*(short *)p));
|
|
break;
|
|
case 4:
|
|
__asm__ __volatile__ ("casl %0,%2,%1"
|
|
: "=d" (old), "=m" (*(int *)p)
|
|
: "d" (new), "0" (old), "m" (*(int *)p));
|
|
break;
|
|
default:
|
|
old = __invalid_cmpxchg_size(p, old, new, size);
|
|
break;
|
|
}
|
|
return old;
|
|
}
|
|
|
|
#define cmpxchg(ptr, o, n) \
|
|
((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
|
|
(unsigned long)(n), sizeof(*(ptr))))
|
|
#define cmpxchg_local(ptr, o, n) \
|
|
((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
|
|
(unsigned long)(n), sizeof(*(ptr))))
|
|
#else
|
|
|
|
/*
|
|
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
|
|
* them available.
|
|
*/
|
|
#define cmpxchg_local(ptr, o, n) \
|
|
((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
|
|
(unsigned long)(n), sizeof(*(ptr))))
|
|
|
|
#include <asm-generic/cmpxchg.h>
|
|
|
|
#endif
|
|
|
|
#endif /* __ARCH_M68K_CMPXCHG__ */
|