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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sh/include/asm/cmpxchg-grb.h
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#ifndef __ASM_SH_CMPXCHG_GRB_H

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#define __ASM_SH_CMPXCHG_GRB_H

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static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)

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{

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	unsigned long retval;

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	__asm__ __volatile__ (

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		"   .align 2              \n\t"

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		"   mova    1f,   r0      \n\t" /* r0 = end point */

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		"   nop                   \n\t"

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		"   mov    r15,   r1      \n\t" /* r1 = saved sp */

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		"   mov    #-4,   r15     \n\t" /* LOGIN */

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		"   mov.l  @%1,   %0      \n\t" /* load  old value */

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		"   mov.l   %2,   @%1     \n\t" /* store new value */

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		"1: mov     r1,   r15     \n\t" /* LOGOUT */

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		: "=&r" (retval),

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		  "+r"  (m),

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		  "+r"  (val)		/* inhibit r15 overloading */

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		:

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		: "memory", "r0", "r1");

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	return retval;

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}

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static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)

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{

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	unsigned long retval;

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	__asm__ __volatile__ (

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		"   .align  2             \n\t"

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		"   mova    1f,   r0      \n\t" /* r0 = end point */

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		"   mov    r15,   r1      \n\t" /* r1 = saved sp */

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		"   mov    #-6,   r15     \n\t" /* LOGIN */

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		"   mov.b  @%1,   %0      \n\t" /* load  old value */

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		"   extu.b  %0,   %0      \n\t" /* extend as unsigned */

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		"   mov.b   %2,   @%1     \n\t" /* store new value */

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		"1: mov     r1,   r15     \n\t" /* LOGOUT */

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		: "=&r" (retval),

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		  "+r"  (m),

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		  "+r"  (val)		/* inhibit r15 overloading */

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		:

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		: "memory" , "r0", "r1");

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	return retval;

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}

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static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,

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					  unsigned long new)

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{

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	unsigned long retval;

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	__asm__ __volatile__ (

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		"   .align  2             \n\t"

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		"   mova    1f,   r0      \n\t" /* r0 = end point */

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		"   nop                   \n\t"

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		"   mov    r15,   r1      \n\t" /* r1 = saved sp */

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		"   mov    #-8,   r15     \n\t" /* LOGIN */

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		"   mov.l  @%3,   %0      \n\t" /* load  old value */

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		"   cmp/eq  %0,   %1      \n\t"

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		"   bf            1f      \n\t" /* if not equal */

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		"   mov.l   %2,   @%3     \n\t" /* store new value */

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		"1: mov     r1,   r15     \n\t" /* LOGOUT */

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		: "=&r" (retval),

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		  "+r"  (old), "+r"  (new) /* old or new can be r15 */

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		:  "r"  (m)

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		: "memory" , "r0", "r1", "t");

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	return retval;

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}

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#endif /* __ASM_SH_CMPXCHG_GRB_H */

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