mirror of
https://github.com/torvalds/linux.git
synced 2024-11-28 07:01:32 +00:00
1efe4ce3ca
This implements kernel-level atomic rollback built on top of gUSA, as an alternative non-IRQ based atomicity method. This is generally a faster method for platforms that are lacking the LL/SC pairs that SH-4A and later use, and is only supportable on legacy cores. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
#ifndef __ASM_SH_ATOMIC_GRB_H
|
|
#define __ASM_SH_ATOMIC_GRB_H
|
|
|
|
static inline void atomic_add(int i, atomic_t *v)
|
|
{
|
|
int tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%1, %0 \n\t" /* load old value */
|
|
" add %2, %0 \n\t" /* add */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (v)
|
|
: "r" (i)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline void atomic_sub(int i, atomic_t *v)
|
|
{
|
|
int tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%1, %0 \n\t" /* load old value */
|
|
" sub %2, %0 \n\t" /* sub */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (v)
|
|
: "r" (i)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline int atomic_add_return(int i, atomic_t *v)
|
|
{
|
|
int tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%1, %0 \n\t" /* load old value */
|
|
" add %2, %0 \n\t" /* add */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (v)
|
|
: "r" (i)
|
|
: "memory" , "r0", "r1");
|
|
|
|
return tmp;
|
|
}
|
|
|
|
static inline int atomic_sub_return(int i, atomic_t *v)
|
|
{
|
|
int tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%1, %0 \n\t" /* load old value */
|
|
" sub %2, %0 \n\t" /* sub */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (v)
|
|
: "r" (i)
|
|
: "memory", "r0", "r1");
|
|
|
|
return tmp;
|
|
}
|
|
|
|
static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
|
|
{
|
|
int tmp;
|
|
unsigned int _mask = ~mask;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%1, %0 \n\t" /* load old value */
|
|
" and %2, %0 \n\t" /* add */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (v)
|
|
: "r" (_mask)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
|
|
{
|
|
int tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%1, %0 \n\t" /* load old value */
|
|
" or %2, %0 \n\t" /* or */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (v)
|
|
: "r" (mask)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
|
|
{
|
|
int ret;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t"
|
|
" nop \n\t"
|
|
" mov r15, r1 \n\t"
|
|
" mov #-8, r15 \n\t"
|
|
" mov.l @%1, %0 \n\t"
|
|
" cmp/eq %2, %0 \n\t"
|
|
" bf 1f \n\t"
|
|
" mov.l %3, @%1 \n\t"
|
|
"1: mov r1, r15 \n\t"
|
|
: "=&r" (ret)
|
|
: "r" (v), "r" (old), "r" (new)
|
|
: "memory" , "r0", "r1" , "t");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int atomic_add_unless(atomic_t *v, int a, int u)
|
|
{
|
|
int ret;
|
|
unsigned long tmp;
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t"
|
|
" nop \n\t"
|
|
" mov r15, r1 \n\t"
|
|
" mov #-12, r15 \n\t"
|
|
" mov.l @%2, %1 \n\t"
|
|
" mov %1, %0 \n\t"
|
|
" cmp/eq %4, %0 \n\t"
|
|
" bt/s 1f \n\t"
|
|
" add %3, %1 \n\t"
|
|
" mov.l %1, @%2 \n\t"
|
|
"1: mov r1, r15 \n\t"
|
|
: "=&r" (ret), "=&r" (tmp)
|
|
: "r" (v), "r" (a), "r" (u)
|
|
: "memory" , "r0", "r1" , "t");
|
|
|
|
return ret != u;
|
|
}
|
|
#endif /* __ASM_SH_ATOMIC_GRB_H */
|