![Jiri Slaby](/assets/img/avatar_default.png)
forbid asm/bitops.h direct inclusion Because of compile errors that may occur after bit changes if asm/bitops.h is included directly without e.g. linux/kernel.h which includes linux/bitops.h, forbid direct inclusion of asm/bitops.h. Thanks to Adrian Bunk. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: Adrian Bunk <bunk@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
162 lines
5.8 KiB
C
162 lines
5.8 KiB
C
/*
|
|
* include/asm-v850/bitops.h -- Bit operations
|
|
*
|
|
* Copyright (C) 2001,02,03,04,05 NEC Electronics Corporation
|
|
* Copyright (C) 2001,02,03,04,05 Miles Bader <miles@gnu.org>
|
|
* Copyright (C) 1992 Linus Torvalds.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*/
|
|
|
|
#ifndef __V850_BITOPS_H__
|
|
#define __V850_BITOPS_H__
|
|
|
|
#ifndef _LINUX_BITOPS_H
|
|
#error only <linux/bitops.h> can be included directly
|
|
#endif
|
|
|
|
#include <linux/compiler.h> /* unlikely */
|
|
#include <asm/byteorder.h> /* swab32 */
|
|
#include <asm/system.h> /* interrupt enable/disable */
|
|
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm-generic/bitops/ffz.h>
|
|
|
|
/*
|
|
* The __ functions are not atomic
|
|
*/
|
|
|
|
/* In the following constant-bit-op macros, a "g" constraint is used when
|
|
we really need an integer ("i" constraint). This is to avoid
|
|
warnings/errors from the compiler in the case where the associated
|
|
operand _isn't_ an integer, and shouldn't produce bogus assembly because
|
|
use of that form is protected by a guard statement that checks for
|
|
constants, and should otherwise be removed by the optimizer. This
|
|
_usually_ works -- however, __builtin_constant_p returns true for a
|
|
variable with a known constant value too, and unfortunately gcc will
|
|
happily put the variable in a register and use the register for the "g"
|
|
constraint'd asm operand. To avoid the latter problem, we add a
|
|
constant offset to the operand and subtract it back in the asm code;
|
|
forcing gcc to do arithmetic on the value is usually enough to get it
|
|
to use a real constant value. This is horrible, and ultimately
|
|
unreliable too, but it seems to work for now (hopefully gcc will offer
|
|
us more control in the future, so we can do a better job). */
|
|
|
|
#define __const_bit_op(op, nr, addr) \
|
|
({ __asm__ (op " (%0 - 0x123), %1" \
|
|
:: "g" (((nr) & 0x7) + 0x123), \
|
|
"m" (*((char *)(addr) + ((nr) >> 3))) \
|
|
: "memory"); })
|
|
#define __var_bit_op(op, nr, addr) \
|
|
({ int __nr = (nr); \
|
|
__asm__ (op " %0, [%1]" \
|
|
:: "r" (__nr & 0x7), \
|
|
"r" ((char *)(addr) + (__nr >> 3)) \
|
|
: "memory"); })
|
|
#define __bit_op(op, nr, addr) \
|
|
((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \
|
|
? __const_bit_op (op, nr, addr) \
|
|
: __var_bit_op (op, nr, addr))
|
|
|
|
#define __set_bit(nr, addr) __bit_op ("set1", nr, addr)
|
|
#define __clear_bit(nr, addr) __bit_op ("clr1", nr, addr)
|
|
#define __change_bit(nr, addr) __bit_op ("not1", nr, addr)
|
|
|
|
/* The bit instructions used by `non-atomic' variants are actually atomic. */
|
|
#define set_bit __set_bit
|
|
#define clear_bit __clear_bit
|
|
#define change_bit __change_bit
|
|
|
|
|
|
#define __const_tns_bit_op(op, nr, addr) \
|
|
({ int __tns_res; \
|
|
__asm__ __volatile__ ( \
|
|
"tst1 (%1 - 0x123), %2; setf nz, %0; " op " (%1 - 0x123), %2" \
|
|
: "=&r" (__tns_res) \
|
|
: "g" (((nr) & 0x7) + 0x123), \
|
|
"m" (*((char *)(addr) + ((nr) >> 3))) \
|
|
: "memory"); \
|
|
__tns_res; \
|
|
})
|
|
#define __var_tns_bit_op(op, nr, addr) \
|
|
({ int __nr = (nr); \
|
|
int __tns_res; \
|
|
__asm__ __volatile__ ( \
|
|
"tst1 %1, [%2]; setf nz, %0; " op " %1, [%2]" \
|
|
: "=&r" (__tns_res) \
|
|
: "r" (__nr & 0x7), \
|
|
"r" ((char *)(addr) + (__nr >> 3)) \
|
|
: "memory"); \
|
|
__tns_res; \
|
|
})
|
|
#define __tns_bit_op(op, nr, addr) \
|
|
((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \
|
|
? __const_tns_bit_op (op, nr, addr) \
|
|
: __var_tns_bit_op (op, nr, addr))
|
|
#define __tns_atomic_bit_op(op, nr, addr) \
|
|
({ int __tns_atomic_res, __tns_atomic_flags; \
|
|
local_irq_save (__tns_atomic_flags); \
|
|
__tns_atomic_res = __tns_bit_op (op, nr, addr); \
|
|
local_irq_restore (__tns_atomic_flags); \
|
|
__tns_atomic_res; \
|
|
})
|
|
|
|
#define __test_and_set_bit(nr, addr) __tns_bit_op ("set1", nr, addr)
|
|
#define test_and_set_bit(nr, addr) __tns_atomic_bit_op ("set1", nr, addr)
|
|
|
|
#define __test_and_clear_bit(nr, addr) __tns_bit_op ("clr1", nr, addr)
|
|
#define test_and_clear_bit(nr, addr) __tns_atomic_bit_op ("clr1", nr, addr)
|
|
|
|
#define __test_and_change_bit(nr, addr) __tns_bit_op ("not1", nr, addr)
|
|
#define test_and_change_bit(nr, addr) __tns_atomic_bit_op ("not1", nr, addr)
|
|
|
|
|
|
#define __const_test_bit(nr, addr) \
|
|
({ int __test_bit_res; \
|
|
__asm__ __volatile__ ("tst1 (%1 - 0x123), %2; setf nz, %0" \
|
|
: "=r" (__test_bit_res) \
|
|
: "g" (((nr) & 0x7) + 0x123), \
|
|
"m" (*((const char *)(addr) + ((nr) >> 3)))); \
|
|
__test_bit_res; \
|
|
})
|
|
static inline int __test_bit (int nr, const void *addr)
|
|
{
|
|
int res;
|
|
__asm__ __volatile__ ("tst1 %1, [%2]; setf nz, %0"
|
|
: "=r" (res)
|
|
: "r" (nr & 0x7), "r" (addr + (nr >> 3)));
|
|
return res;
|
|
}
|
|
#define test_bit(nr,addr) \
|
|
((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \
|
|
? __const_test_bit ((nr), (addr)) \
|
|
: __test_bit ((nr), (addr)))
|
|
|
|
|
|
/* clear_bit doesn't provide any barrier for the compiler. */
|
|
#define smp_mb__before_clear_bit() barrier ()
|
|
#define smp_mb__after_clear_bit() barrier ()
|
|
|
|
#include <asm-generic/bitops/ffs.h>
|
|
#include <asm-generic/bitops/fls.h>
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/__ffs.h>
|
|
#include <asm-generic/bitops/find.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
#include <asm-generic/bitops/hweight.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>
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __V850_BITOPS_H__ */
|