1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
/*
|
|
* Copyright (C) 1996 Paul Mackerras.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/bitops.h>
|
|
|
|
/*
|
|
* If the bitops are not inlined in bitops.h, they are defined here.
|
|
* -- paulus
|
|
*/
|
|
#if !__INLINE_BITOPS
|
|
void set_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long old;
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%3 \n\
|
|
or %0,%0,%2 \n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc" );
|
|
}
|
|
|
|
void clear_bit(int nr, volatile void *addr)
|
|
{
|
|
unsigned long old;
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%3 \n\
|
|
andc %0,%0,%2 \n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
}
|
|
|
|
void change_bit(int nr, volatile void *addr)
|
|
{
|
|
unsigned long old;
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%3 \n\
|
|
xor %0,%0,%2 \n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
}
|
|
|
|
int test_and_set_bit(int nr, volatile void *addr)
|
|
{
|
|
unsigned int old, t;
|
|
unsigned int mask = 1 << (nr & 0x1f);
|
|
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%4 \n\
|
|
or %1,%0,%3 \n"
|
|
PPC405_ERR77(0,%4)
|
|
" stwcx. %1,0,%4 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=&r" (t), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
int test_and_clear_bit(int nr, volatile void *addr)
|
|
{
|
|
unsigned int old, t;
|
|
unsigned int mask = 1 << (nr & 0x1f);
|
|
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%4 \n\
|
|
andc %1,%0,%3 \n"
|
|
PPC405_ERR77(0,%4)
|
|
" stwcx. %1,0,%4 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=&r" (t), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
int test_and_change_bit(int nr, volatile void *addr)
|
|
{
|
|
unsigned int old, t;
|
|
unsigned int mask = 1 << (nr & 0x1f);
|
|
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%4 \n\
|
|
xor %1,%0,%3 \n"
|
|
PPC405_ERR77(0,%4)
|
|
" stwcx. %1,0,%4 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=&r" (t), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
#endif /* !__INLINE_BITOPS */
|