mirror of https://gitee.com/openkylin/linux.git
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
|
#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 */
|