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/
usr/
src/
linux-headers-3.0.0-14/
arch/
sh/
include/
asm/
- drwxr-xr-x
|
Viewing file:  atomic-llsc.h (2.15 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
#ifndef __ASM_SH_ATOMIC_LLSC_H
#define __ASM_SH_ATOMIC_LLSC_H
/*
* To get proper branch prediction for the main line, we must branch
* forward to code at the end of this object's .text section, then
* branch back to restart the operation.
*/
static inline void atomic_add(int i, atomic_t *v)
{
unsigned long tmp;
__asm__ __volatile__ (
"1: movli.l @%2, %0 ! atomic_add \n"
" add %1, %0 \n"
" movco.l %0, @%2 \n"
" bf 1b \n"
: "=&z" (tmp)
: "r" (i), "r" (&v->counter)
: "t");
}
static inline void atomic_sub(int i, atomic_t *v)
{
unsigned long tmp;
__asm__ __volatile__ (
"1: movli.l @%2, %0 ! atomic_sub \n"
" sub %1, %0 \n"
" movco.l %0, @%2 \n"
" bf 1b \n"
: "=&z" (tmp)
: "r" (i), "r" (&v->counter)
: "t");
}
/*
* SH-4A note:
*
* We basically get atomic_xxx_return() for free compared with
* atomic_xxx(). movli.l/movco.l require r0 due to the instruction
* encoding, so the retval is automatically set without having to
* do any special work.
*/
static inline int atomic_add_return(int i, atomic_t *v)
{
unsigned long temp;
__asm__ __volatile__ (
"1: movli.l @%2, %0 ! atomic_add_return \n"
" add %1, %0 \n"
" movco.l %0, @%2 \n"
" bf 1b \n"
" synco \n"
: "=&z" (temp)
: "r" (i), "r" (&v->counter)
: "t");
return temp;
}
static inline int atomic_sub_return(int i, atomic_t *v)
{
unsigned long temp;
__asm__ __volatile__ (
"1: movli.l @%2, %0 ! atomic_sub_return \n"
" sub %1, %0 \n"
" movco.l %0, @%2 \n"
" bf 1b \n"
" synco \n"
: "=&z" (temp)
: "r" (i), "r" (&v->counter)
: "t");
return temp;
}
static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
{
unsigned long tmp;
__asm__ __volatile__ (
"1: movli.l @%2, %0 ! atomic_clear_mask \n"
" and %1, %0 \n"
" movco.l %0, @%2 \n"
" bf 1b \n"
: "=&z" (tmp)
: "r" (~mask), "r" (&v->counter)
: "t");
}
static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
{
unsigned long tmp;
__asm__ __volatile__ (
"1: movli.l @%2, %0 ! atomic_set_mask \n"
" or %1, %0 \n"
" movco.l %0, @%2 \n"
" bf 1b \n"
: "=&z" (tmp)
: "r" (mask), "r" (&v->counter)
: "t");
}
#endif /* __ASM_SH_ATOMIC_LLSC_H */
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