mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 02:50:43 +00:00
![Stuart Menefy](/assets/img/avatar_default.png)
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>
169 lines
6.1 KiB
C
169 lines
6.1 KiB
C
#ifndef __ASM_SH_BITOPS_GRB_H
|
|
#define __ASM_SH_BITOPS_GRB_H
|
|
|
|
static inline void set_bit(int nr, volatile void * addr)
|
|
{
|
|
int mask;
|
|
volatile unsigned int *a = addr;
|
|
unsigned long tmp;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
|
|
__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" (a)
|
|
: "r" (mask)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline void clear_bit(int nr, volatile void * addr)
|
|
{
|
|
int mask;
|
|
volatile unsigned int *a = addr;
|
|
unsigned long tmp;
|
|
|
|
a += nr >> 5;
|
|
mask = ~(1 << (nr & 0x1f));
|
|
__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" /* and */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (a)
|
|
: "r" (mask)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline void change_bit(int nr, volatile void * addr)
|
|
{
|
|
int mask;
|
|
volatile unsigned int *a = addr;
|
|
unsigned long tmp;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
__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 */
|
|
" xor %2, %0 \n\t" /* xor */
|
|
" mov.l %0, @%1 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"+r" (a)
|
|
: "r" (mask)
|
|
: "memory" , "r0", "r1");
|
|
}
|
|
|
|
static inline int test_and_set_bit(int nr, volatile void * addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = addr;
|
|
unsigned long tmp;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-14, r15 \n\t" /* LOGIN: r15 = size */
|
|
" mov.l @%2, %0 \n\t" /* load old value */
|
|
" mov %0, %1 \n\t"
|
|
" tst %1, %3 \n\t" /* T = ((*a & mask) == 0) */
|
|
" mov #-1, %1 \n\t" /* retvat = -1 */
|
|
" negc %1, %1 \n\t" /* retval = (mask & *a) != 0 */
|
|
" or %3, %0 \n\t"
|
|
" mov.l %0, @%2 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"=&r" (retval),
|
|
"+r" (a)
|
|
: "r" (mask)
|
|
: "memory" , "r0", "r1" ,"t");
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline int test_and_clear_bit(int nr, volatile void * addr)
|
|
{
|
|
int mask, retval,not_mask;
|
|
volatile unsigned int *a = addr;
|
|
unsigned long tmp;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
|
|
not_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 #-14, r15 \n\t" /* LOGIN */
|
|
" mov.l @%2, %0 \n\t" /* load old value */
|
|
" mov %0, %1 \n\t" /* %1 = *a */
|
|
" tst %1, %3 \n\t" /* T = ((*a & mask) == 0) */
|
|
" mov #-1, %1 \n\t" /* retvat = -1 */
|
|
" negc %1, %1 \n\t" /* retval = (mask & *a) != 0 */
|
|
" and %4, %0 \n\t"
|
|
" mov.l %0, @%2 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"=&r" (retval),
|
|
"+r" (a)
|
|
: "r" (mask),
|
|
"r" (not_mask)
|
|
: "memory" , "r0", "r1", "t");
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline int test_and_change_bit(int nr, volatile void * addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = addr;
|
|
unsigned long tmp;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
|
|
__asm__ __volatile__ (
|
|
" .align 2 \n\t"
|
|
" mova 1f, r0 \n\t" /* r0 = end point */
|
|
" mov r15, r1 \n\t" /* r1 = saved sp */
|
|
" mov #-14, r15 \n\t" /* LOGIN */
|
|
" mov.l @%2, %0 \n\t" /* load old value */
|
|
" mov %0, %1 \n\t" /* %1 = *a */
|
|
" tst %1, %3 \n\t" /* T = ((*a & mask) == 0) */
|
|
" mov #-1, %1 \n\t" /* retvat = -1 */
|
|
" negc %1, %1 \n\t" /* retval = (mask & *a) != 0 */
|
|
" xor %3, %0 \n\t"
|
|
" mov.l %0, @%2 \n\t" /* store new value */
|
|
"1: mov r1, r15 \n\t" /* LOGOUT */
|
|
: "=&r" (tmp),
|
|
"=&r" (retval),
|
|
"+r" (a)
|
|
: "r" (mask)
|
|
: "memory" , "r0", "r1", "t");
|
|
|
|
return retval;
|
|
}
|
|
#endif /* __ASM_SH_BITOPS_GRB_H */
|