mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 17:51:43 +00:00
b1d6b40cbd
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
304 lines
7.1 KiB
C
304 lines
7.1 KiB
C
/*
|
|
* Copyright IBM Corp. 1999, 2011
|
|
*
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
|
|
*/
|
|
|
|
#ifndef __ASM_CMPXCHG_H
|
|
#define __ASM_CMPXCHG_H
|
|
|
|
#include <linux/mmdebug.h>
|
|
#include <linux/types.h>
|
|
#include <linux/bug.h>
|
|
|
|
extern void __xchg_called_with_bad_pointer(void);
|
|
|
|
static inline unsigned long __xchg(unsigned long x, void *ptr, int size)
|
|
{
|
|
unsigned long addr, old;
|
|
int shift;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
addr = (unsigned long) ptr;
|
|
shift = (3 ^ (addr & 3)) << 3;
|
|
addr ^= addr & 3;
|
|
asm volatile(
|
|
" l %0,%4\n"
|
|
"0: lr 0,%0\n"
|
|
" nr 0,%3\n"
|
|
" or 0,%2\n"
|
|
" cs %0,0,%4\n"
|
|
" jl 0b\n"
|
|
: "=&d" (old), "=Q" (*(int *) addr)
|
|
: "d" ((x & 0xff) << shift), "d" (~(0xff << shift)),
|
|
"Q" (*(int *) addr) : "memory", "cc", "0");
|
|
return old >> shift;
|
|
case 2:
|
|
addr = (unsigned long) ptr;
|
|
shift = (2 ^ (addr & 2)) << 3;
|
|
addr ^= addr & 2;
|
|
asm volatile(
|
|
" l %0,%4\n"
|
|
"0: lr 0,%0\n"
|
|
" nr 0,%3\n"
|
|
" or 0,%2\n"
|
|
" cs %0,0,%4\n"
|
|
" jl 0b\n"
|
|
: "=&d" (old), "=Q" (*(int *) addr)
|
|
: "d" ((x & 0xffff) << shift), "d" (~(0xffff << shift)),
|
|
"Q" (*(int *) addr) : "memory", "cc", "0");
|
|
return old >> shift;
|
|
case 4:
|
|
asm volatile(
|
|
" l %0,%3\n"
|
|
"0: cs %0,%2,%3\n"
|
|
" jl 0b\n"
|
|
: "=&d" (old), "=Q" (*(int *) ptr)
|
|
: "d" (x), "Q" (*(int *) ptr)
|
|
: "memory", "cc");
|
|
return old;
|
|
#ifdef CONFIG_64BIT
|
|
case 8:
|
|
asm volatile(
|
|
" lg %0,%3\n"
|
|
"0: csg %0,%2,%3\n"
|
|
" jl 0b\n"
|
|
: "=&d" (old), "=m" (*(long *) ptr)
|
|
: "d" (x), "Q" (*(long *) ptr)
|
|
: "memory", "cc");
|
|
return old;
|
|
#endif /* CONFIG_64BIT */
|
|
}
|
|
__xchg_called_with_bad_pointer();
|
|
return x;
|
|
}
|
|
|
|
#define xchg(ptr, x) \
|
|
({ \
|
|
__typeof__(*(ptr)) __ret; \
|
|
__ret = (__typeof__(*(ptr))) \
|
|
__xchg((unsigned long)(x), (void *)(ptr), sizeof(*(ptr)));\
|
|
__ret; \
|
|
})
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#define __HAVE_ARCH_CMPXCHG
|
|
|
|
extern void __cmpxchg_called_with_bad_pointer(void);
|
|
|
|
static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
|
|
unsigned long new, int size)
|
|
{
|
|
unsigned long addr, prev, tmp;
|
|
int shift;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
addr = (unsigned long) ptr;
|
|
shift = (3 ^ (addr & 3)) << 3;
|
|
addr ^= addr & 3;
|
|
asm volatile(
|
|
" l %0,%2\n"
|
|
"0: nr %0,%5\n"
|
|
" lr %1,%0\n"
|
|
" or %0,%3\n"
|
|
" or %1,%4\n"
|
|
" cs %0,%1,%2\n"
|
|
" jnl 1f\n"
|
|
" xr %1,%0\n"
|
|
" nr %1,%5\n"
|
|
" jnz 0b\n"
|
|
"1:"
|
|
: "=&d" (prev), "=&d" (tmp), "+Q" (*(int *) addr)
|
|
: "d" ((old & 0xff) << shift),
|
|
"d" ((new & 0xff) << shift),
|
|
"d" (~(0xff << shift))
|
|
: "memory", "cc");
|
|
return prev >> shift;
|
|
case 2:
|
|
addr = (unsigned long) ptr;
|
|
shift = (2 ^ (addr & 2)) << 3;
|
|
addr ^= addr & 2;
|
|
asm volatile(
|
|
" l %0,%2\n"
|
|
"0: nr %0,%5\n"
|
|
" lr %1,%0\n"
|
|
" or %0,%3\n"
|
|
" or %1,%4\n"
|
|
" cs %0,%1,%2\n"
|
|
" jnl 1f\n"
|
|
" xr %1,%0\n"
|
|
" nr %1,%5\n"
|
|
" jnz 0b\n"
|
|
"1:"
|
|
: "=&d" (prev), "=&d" (tmp), "+Q" (*(int *) addr)
|
|
: "d" ((old & 0xffff) << shift),
|
|
"d" ((new & 0xffff) << shift),
|
|
"d" (~(0xffff << shift))
|
|
: "memory", "cc");
|
|
return prev >> shift;
|
|
case 4:
|
|
asm volatile(
|
|
" cs %0,%3,%1\n"
|
|
: "=&d" (prev), "=Q" (*(int *) ptr)
|
|
: "0" (old), "d" (new), "Q" (*(int *) ptr)
|
|
: "memory", "cc");
|
|
return prev;
|
|
#ifdef CONFIG_64BIT
|
|
case 8:
|
|
asm volatile(
|
|
" csg %0,%3,%1\n"
|
|
: "=&d" (prev), "=Q" (*(long *) ptr)
|
|
: "0" (old), "d" (new), "Q" (*(long *) ptr)
|
|
: "memory", "cc");
|
|
return prev;
|
|
#endif /* CONFIG_64BIT */
|
|
}
|
|
__cmpxchg_called_with_bad_pointer();
|
|
return old;
|
|
}
|
|
|
|
#define cmpxchg(ptr, o, n) \
|
|
({ \
|
|
__typeof__(*(ptr)) __ret; \
|
|
__ret = (__typeof__(*(ptr))) \
|
|
__cmpxchg((ptr), (unsigned long)(o), (unsigned long)(n), \
|
|
sizeof(*(ptr))); \
|
|
__ret; \
|
|
})
|
|
|
|
#ifdef CONFIG_64BIT
|
|
#define cmpxchg64(ptr, o, n) \
|
|
({ \
|
|
cmpxchg((ptr), (o), (n)); \
|
|
})
|
|
#else /* CONFIG_64BIT */
|
|
static inline unsigned long long __cmpxchg64(void *ptr,
|
|
unsigned long long old,
|
|
unsigned long long new)
|
|
{
|
|
register_pair rp_old = {.pair = old};
|
|
register_pair rp_new = {.pair = new};
|
|
|
|
asm volatile(
|
|
" cds %0,%2,%1"
|
|
: "+&d" (rp_old), "=Q" (ptr)
|
|
: "d" (rp_new), "Q" (ptr)
|
|
: "memory", "cc");
|
|
return rp_old.pair;
|
|
}
|
|
|
|
#define cmpxchg64(ptr, o, n) \
|
|
({ \
|
|
__typeof__(*(ptr)) __ret; \
|
|
__ret = (__typeof__(*(ptr))) \
|
|
__cmpxchg64((ptr), \
|
|
(unsigned long long)(o), \
|
|
(unsigned long long)(n)); \
|
|
__ret; \
|
|
})
|
|
#endif /* CONFIG_64BIT */
|
|
|
|
#define __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, insn) \
|
|
({ \
|
|
register __typeof__(*(p1)) __old1 asm("2") = (o1); \
|
|
register __typeof__(*(p2)) __old2 asm("3") = (o2); \
|
|
register __typeof__(*(p1)) __new1 asm("4") = (n1); \
|
|
register __typeof__(*(p2)) __new2 asm("5") = (n2); \
|
|
int cc; \
|
|
asm volatile( \
|
|
insn " %[old],%[new],%[ptr]\n" \
|
|
" ipm %[cc]\n" \
|
|
" srl %[cc],28" \
|
|
: [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \
|
|
: [new] "d" (__new1), "d" (__new2), \
|
|
[ptr] "Q" (*(p1)), "Q" (*(p2)) \
|
|
: "memory", "cc"); \
|
|
!cc; \
|
|
})
|
|
|
|
#define __cmpxchg_double_4(p1, p2, o1, o2, n1, n2) \
|
|
__cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cds")
|
|
|
|
#define __cmpxchg_double_8(p1, p2, o1, o2, n1, n2) \
|
|
__cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cdsg")
|
|
|
|
extern void __cmpxchg_double_called_with_bad_pointer(void);
|
|
|
|
#define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \
|
|
({ \
|
|
int __ret; \
|
|
switch (sizeof(*(p1))) { \
|
|
case 4: \
|
|
__ret = __cmpxchg_double_4(p1, p2, o1, o2, n1, n2); \
|
|
break; \
|
|
case 8: \
|
|
__ret = __cmpxchg_double_8(p1, p2, o1, o2, n1, n2); \
|
|
break; \
|
|
default: \
|
|
__cmpxchg_double_called_with_bad_pointer(); \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
#define cmpxchg_double(p1, p2, o1, o2, n1, n2) \
|
|
({ \
|
|
__typeof__(p1) __p1 = (p1); \
|
|
__typeof__(p2) __p2 = (p2); \
|
|
int __ret; \
|
|
BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \
|
|
BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \
|
|
VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\
|
|
if (sizeof(long) == 4) \
|
|
__ret = __cmpxchg_double_4(__p1, __p2, o1, o2, n1, n2); \
|
|
else \
|
|
__ret = __cmpxchg_double_8(__p1, __p2, o1, o2, n1, n2); \
|
|
__ret; \
|
|
})
|
|
|
|
#define system_has_cmpxchg_double() 1
|
|
|
|
#include <asm-generic/cmpxchg-local.h>
|
|
|
|
static inline unsigned long __cmpxchg_local(void *ptr,
|
|
unsigned long old,
|
|
unsigned long new, int size)
|
|
{
|
|
switch (size) {
|
|
case 1:
|
|
case 2:
|
|
case 4:
|
|
#ifdef CONFIG_64BIT
|
|
case 8:
|
|
#endif
|
|
return __cmpxchg(ptr, old, new, size);
|
|
default:
|
|
return __cmpxchg_local_generic(ptr, old, new, size);
|
|
}
|
|
|
|
return old;
|
|
}
|
|
|
|
/*
|
|
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
|
|
* them available.
|
|
*/
|
|
#define cmpxchg_local(ptr, o, n) \
|
|
({ \
|
|
__typeof__(*(ptr)) __ret; \
|
|
__ret = (__typeof__(*(ptr))) \
|
|
__cmpxchg_local((ptr), (unsigned long)(o), \
|
|
(unsigned long)(n), sizeof(*(ptr))); \
|
|
__ret; \
|
|
})
|
|
|
|
#define cmpxchg64_local(ptr, o, n) cmpxchg64((ptr), (o), (n))
|
|
|
|
#endif /* __ASM_CMPXCHG_H */
|