Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Heiko Carstens | 322 | 75.59% | 10 | 66.67% |
Janis Schoetterl-Glausch | 64 | 15.02% | 1 | 6.67% |
Peter Zijlstra | 33 | 7.75% | 1 | 6.67% |
Martin Schwidefsky | 4 | 0.94% | 1 | 6.67% |
Andrzej Hajda | 2 | 0.47% | 1 | 6.67% |
Greg Kroah-Hartman | 1 | 0.23% | 1 | 6.67% |
Total | 426 | 15 |
/* SPDX-License-Identifier: GPL-2.0 */ /* * 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> void __xchg_called_with_bad_pointer(void); static __always_inline unsigned long __arch_xchg(unsigned long x, unsigned long address, int size) { unsigned long old; int shift; switch (size) { case 1: shift = (3 ^ (address & 3)) << 3; address ^= address & 3; asm volatile( " l %0,%1\n" "0: lr 0,%0\n" " nr 0,%3\n" " or 0,%2\n" " cs %0,0,%1\n" " jl 0b\n" : "=&d" (old), "+Q" (*(int *) address) : "d" ((x & 0xff) << shift), "d" (~(0xff << shift)) : "memory", "cc", "0"); return old >> shift; case 2: shift = (2 ^ (address & 2)) << 3; address ^= address & 2; asm volatile( " l %0,%1\n" "0: lr 0,%0\n" " nr 0,%3\n" " or 0,%2\n" " cs %0,0,%1\n" " jl 0b\n" : "=&d" (old), "+Q" (*(int *) address) : "d" ((x & 0xffff) << shift), "d" (~(0xffff << shift)) : "memory", "cc", "0"); return old >> shift; case 4: asm volatile( " l %0,%1\n" "0: cs %0,%2,%1\n" " jl 0b\n" : "=&d" (old), "+Q" (*(int *) address) : "d" (x) : "memory", "cc"); return old; case 8: asm volatile( " lg %0,%1\n" "0: csg %0,%2,%1\n" " jl 0b\n" : "=&d" (old), "+QS" (*(long *) address) : "d" (x) : "memory", "cc"); return old; } __xchg_called_with_bad_pointer(); return x; } #define arch_xchg(ptr, x) \ ({ \ __typeof__(*(ptr)) __ret; \ \ __ret = (__typeof__(*(ptr))) \ __arch_xchg((unsigned long)(x), (unsigned long)(ptr), \ sizeof(*(ptr))); \ __ret; \ }) void __cmpxchg_called_with_bad_pointer(void); static __always_inline unsigned long __cmpxchg(unsigned long address, unsigned long old, unsigned long new, int size) { switch (size) { case 1: { unsigned int prev, shift, mask; shift = (3 ^ (address & 3)) << 3; address ^= address & 3; old = (old & 0xff) << shift; new = (new & 0xff) << shift; mask = ~(0xff << shift); asm volatile( " l %[prev],%[address]\n" " nr %[prev],%[mask]\n" " xilf %[mask],0xffffffff\n" " or %[new],%[prev]\n" " or %[prev],%[tmp]\n" "0: lr %[tmp],%[prev]\n" " cs %[prev],%[new],%[address]\n" " jnl 1f\n" " xr %[tmp],%[prev]\n" " xr %[new],%[tmp]\n" " nr %[tmp],%[mask]\n" " jz 0b\n" "1:" : [prev] "=&d" (prev), [address] "+Q" (*(int *)address), [tmp] "+&d" (old), [new] "+&d" (new), [mask] "+&d" (mask) :: "memory", "cc"); return prev >> shift; } case 2: { unsigned int prev, shift, mask; shift = (2 ^ (address & 2)) << 3; address ^= address & 2; old = (old & 0xffff) << shift; new = (new & 0xffff) << shift; mask = ~(0xffff << shift); asm volatile( " l %[prev],%[address]\n" " nr %[prev],%[mask]\n" " xilf %[mask],0xffffffff\n" " or %[new],%[prev]\n" " or %[prev],%[tmp]\n" "0: lr %[tmp],%[prev]\n" " cs %[prev],%[new],%[address]\n" " jnl 1f\n" " xr %[tmp],%[prev]\n" " xr %[new],%[tmp]\n" " nr %[tmp],%[mask]\n" " jz 0b\n" "1:" : [prev] "=&d" (prev), [address] "+Q" (*(int *)address), [tmp] "+&d" (old), [new] "+&d" (new), [mask] "+&d" (mask) :: "memory", "cc"); return prev >> shift; } case 4: { unsigned int prev = old; asm volatile( " cs %[prev],%[new],%[address]\n" : [prev] "+&d" (prev), [address] "+Q" (*(int *)address) : [new] "d" (new) : "memory", "cc"); return prev; } case 8: { unsigned long prev = old; asm volatile( " csg %[prev],%[new],%[address]\n" : [prev] "+&d" (prev), [address] "+QS" (*(long *)address) : [new] "d" (new) : "memory", "cc"); return prev; } } __cmpxchg_called_with_bad_pointer(); return old; } #define arch_cmpxchg(ptr, o, n) \ ({ \ __typeof__(*(ptr)) __ret; \ \ __ret = (__typeof__(*(ptr))) \ __cmpxchg((unsigned long)(ptr), (unsigned long)(o), \ (unsigned long)(n), sizeof(*(ptr))); \ __ret; \ }) #define arch_cmpxchg64 arch_cmpxchg #define arch_cmpxchg_local arch_cmpxchg #define arch_cmpxchg64_local arch_cmpxchg #define system_has_cmpxchg128() 1 static __always_inline u128 arch_cmpxchg128(volatile u128 *ptr, u128 old, u128 new) { asm volatile( " cdsg %[old],%[new],%[ptr]\n" : [old] "+d" (old), [ptr] "+QS" (*ptr) : [new] "d" (new) : "memory", "cc"); return old; } #define arch_cmpxchg128 arch_cmpxchg128 #endif /* __ASM_CMPXCHG_H */
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