mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
747646a4d9
This is very old code, it hasn't changed since 2001 and it is not used anywhere. Noticed by Clemens Koller. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
167 lines
4.3 KiB
C
167 lines
4.3 KiB
C
/* asm/bitops.h for Linux/CRIS
|
|
*
|
|
* TODO: asm versions if speed is needed
|
|
*
|
|
* All bit operations return 0 if the bit was cleared before the
|
|
* operation and != 0 if it was not.
|
|
*
|
|
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
|
|
*/
|
|
|
|
#ifndef _CRIS_BITOPS_H
|
|
#define _CRIS_BITOPS_H
|
|
|
|
/* Currently this is unsuitable for consumption outside the kernel. */
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef _LINUX_BITOPS_H
|
|
#error only <linux/bitops.h> can be included directly
|
|
#endif
|
|
|
|
#include <asm/arch/bitops.h>
|
|
#include <asm/system.h>
|
|
#include <asm/atomic.h>
|
|
#include <linux/compiler.h>
|
|
|
|
/*
|
|
* set_bit - Atomically set a bit in memory
|
|
* @nr: the bit to set
|
|
* @addr: the address to start counting from
|
|
*
|
|
* This function is atomic and may not be reordered. See __set_bit()
|
|
* if you do not require the atomic guarantees.
|
|
* Note that @nr may be almost arbitrarily large; this function is not
|
|
* restricted to acting on a single-word quantity.
|
|
*/
|
|
|
|
#define set_bit(nr, addr) (void)test_and_set_bit(nr, addr)
|
|
|
|
/*
|
|
* clear_bit - Clears a bit in memory
|
|
* @nr: Bit to clear
|
|
* @addr: Address to start counting from
|
|
*
|
|
* clear_bit() is atomic and may not be reordered. However, it does
|
|
* not contain a memory barrier, so if it is used for locking purposes,
|
|
* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
|
|
* in order to ensure changes are visible on other processors.
|
|
*/
|
|
|
|
#define clear_bit(nr, addr) (void)test_and_clear_bit(nr, addr)
|
|
|
|
/*
|
|
* change_bit - Toggle a bit in memory
|
|
* @nr: Bit to change
|
|
* @addr: Address to start counting from
|
|
*
|
|
* change_bit() is atomic and may not be reordered.
|
|
* Note that @nr may be almost arbitrarily large; this function is not
|
|
* restricted to acting on a single-word quantity.
|
|
*/
|
|
|
|
#define change_bit(nr, addr) (void)test_and_change_bit(nr, addr)
|
|
|
|
/**
|
|
* test_and_set_bit - Set a bit and return its old value
|
|
* @nr: Bit to set
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is atomic and cannot be reordered.
|
|
* It also implies a memory barrier.
|
|
*/
|
|
|
|
static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned int mask, retval;
|
|
unsigned long flags;
|
|
unsigned int *adr = (unsigned int *)addr;
|
|
|
|
adr += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
cris_atomic_save(addr, flags);
|
|
retval = (mask & *adr) != 0;
|
|
*adr |= mask;
|
|
cris_atomic_restore(addr, flags);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* clear_bit() doesn't provide any barrier for the compiler.
|
|
*/
|
|
#define smp_mb__before_clear_bit() barrier()
|
|
#define smp_mb__after_clear_bit() barrier()
|
|
|
|
/**
|
|
* test_and_clear_bit - Clear a bit and return its old value
|
|
* @nr: Bit to clear
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is atomic and cannot be reordered.
|
|
* It also implies a memory barrier.
|
|
*/
|
|
|
|
static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned int mask, retval;
|
|
unsigned long flags;
|
|
unsigned int *adr = (unsigned int *)addr;
|
|
|
|
adr += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
cris_atomic_save(addr, flags);
|
|
retval = (mask & *adr) != 0;
|
|
*adr &= ~mask;
|
|
cris_atomic_restore(addr, flags);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* test_and_change_bit - Change a bit and return its old value
|
|
* @nr: Bit to change
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is atomic and cannot be reordered.
|
|
* It also implies a memory barrier.
|
|
*/
|
|
|
|
static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned int mask, retval;
|
|
unsigned long flags;
|
|
unsigned int *adr = (unsigned int *)addr;
|
|
adr += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
cris_atomic_save(addr, flags);
|
|
retval = (mask & *adr) != 0;
|
|
*adr ^= mask;
|
|
cris_atomic_restore(addr, flags);
|
|
return retval;
|
|
}
|
|
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
/*
|
|
* Since we define it "external", it collides with the built-in
|
|
* definition, which doesn't have the same semantics. We don't want to
|
|
* use -fno-builtin, so just hide the name ffs.
|
|
*/
|
|
#define ffs kernel_ffs
|
|
|
|
#include <asm-generic/bitops/fls.h>
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#include <asm-generic/bitops/find.h>
|
|
#include <asm-generic/bitops/lock.h>
|
|
|
|
#include <asm-generic/bitops/ext2-non-atomic.h>
|
|
|
|
#define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a)
|
|
#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
|
|
|
|
#include <asm-generic/bitops/minix.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _CRIS_BITOPS_H */
|