1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Port on Texas Instruments TMS320C6x architecture
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
6*4882a593Smuzhiyun * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun #ifndef _ASM_C6X_CMPXCHG_H
9*4882a593Smuzhiyun #define _ASM_C6X_CMPXCHG_H
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/irqflags.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun * Misc. functions
15*4882a593Smuzhiyun */
__xchg(unsigned int x,volatile void * ptr,int size)16*4882a593Smuzhiyun static inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun unsigned int tmp;
19*4882a593Smuzhiyun unsigned long flags;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun local_irq_save(flags);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun switch (size) {
24*4882a593Smuzhiyun case 1:
25*4882a593Smuzhiyun tmp = 0;
26*4882a593Smuzhiyun tmp = *((unsigned char *) ptr);
27*4882a593Smuzhiyun *((unsigned char *) ptr) = (unsigned char) x;
28*4882a593Smuzhiyun break;
29*4882a593Smuzhiyun case 2:
30*4882a593Smuzhiyun tmp = 0;
31*4882a593Smuzhiyun tmp = *((unsigned short *) ptr);
32*4882a593Smuzhiyun *((unsigned short *) ptr) = x;
33*4882a593Smuzhiyun break;
34*4882a593Smuzhiyun case 4:
35*4882a593Smuzhiyun tmp = 0;
36*4882a593Smuzhiyun tmp = *((unsigned int *) ptr);
37*4882a593Smuzhiyun *((unsigned int *) ptr) = x;
38*4882a593Smuzhiyun break;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun local_irq_restore(flags);
41*4882a593Smuzhiyun return tmp;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun #define xchg(ptr, x) \
45*4882a593Smuzhiyun ((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \
46*4882a593Smuzhiyun sizeof(*(ptr))))
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun #include <asm-generic/cmpxchg-local.h>
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /*
51*4882a593Smuzhiyun * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
52*4882a593Smuzhiyun * them available.
53*4882a593Smuzhiyun */
54*4882a593Smuzhiyun #define cmpxchg_local(ptr, o, n) \
55*4882a593Smuzhiyun ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
56*4882a593Smuzhiyun (unsigned long)(o), \
57*4882a593Smuzhiyun (unsigned long)(n), \
58*4882a593Smuzhiyun sizeof(*(ptr))))
59*4882a593Smuzhiyun #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun #include <asm-generic/cmpxchg.h>
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun #endif /* _ASM_C6X_CMPXCHG_H */
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