mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 17:12:06 +00:00
0d5bbe0bc2
This ties in the new SH-2A 32-bit non-atomic bitops. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
#ifndef __ASM_SH_BITOPS_OP32_H
|
|
#define __ASM_SH_BITOPS_OP32_H
|
|
|
|
/*
|
|
* The bit modifying instructions on SH-2A are only capable of working
|
|
* with a 3-bit immediate, which signifies the shift position for the bit
|
|
* being worked on.
|
|
*/
|
|
#if defined(__BIG_ENDIAN)
|
|
#define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7)
|
|
#define BYTE_NUMBER(nr) ((nr ^ BITOP_LE_SWIZZLE) / BITS_PER_BYTE)
|
|
#define BYTE_OFFSET(nr) ((nr ^ BITOP_LE_SWIZZLE) % BITS_PER_BYTE)
|
|
#else
|
|
#define BYTE_NUMBER(nr) ((nr) / BITS_PER_BYTE)
|
|
#define BYTE_OFFSET(nr) ((nr) % BITS_PER_BYTE)
|
|
#endif
|
|
|
|
#define IS_IMMEDIATE(nr) (__builtin_constant_p(nr))
|
|
|
|
static inline void __set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
if (IS_IMMEDIATE(nr)) {
|
|
__asm__ __volatile__ (
|
|
"bset.b %1, @(%O2,%0) ! __set_bit\n\t"
|
|
: "+r" (addr)
|
|
: "i" (BYTE_OFFSET(nr)), "i" (BYTE_NUMBER(nr))
|
|
: "t", "memory"
|
|
);
|
|
} else {
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p |= mask;
|
|
}
|
|
}
|
|
|
|
static inline void __clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
if (IS_IMMEDIATE(nr)) {
|
|
__asm__ __volatile__ (
|
|
"bclr.b %1, @(%O2,%0) ! __clear_bit\n\t"
|
|
: "+r" (addr)
|
|
: "i" (BYTE_OFFSET(nr)),
|
|
"i" (BYTE_NUMBER(nr))
|
|
: "t", "memory"
|
|
);
|
|
} else {
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p &= ~mask;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __change_bit - Toggle a bit in memory
|
|
* @nr: the bit to change
|
|
* @addr: the address to start counting from
|
|
*
|
|
* Unlike change_bit(), this function is non-atomic and may be reordered.
|
|
* If it's called on the same region of memory simultaneously, the effect
|
|
* may be that only one operation succeeds.
|
|
*/
|
|
static inline void __change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
if (IS_IMMEDIATE(nr)) {
|
|
__asm__ __volatile__ (
|
|
"bxor.b %1, @(%O2,%0) ! __change_bit\n\t"
|
|
: "+r" (addr)
|
|
: "i" (BYTE_OFFSET(nr)),
|
|
"i" (BYTE_NUMBER(nr))
|
|
: "t", "memory"
|
|
);
|
|
} else {
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p ^= mask;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __test_and_set_bit - Set a bit and return its old value
|
|
* @nr: Bit to set
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is non-atomic and can be reordered.
|
|
* If two examples of this operation race, one can appear to succeed
|
|
* but actually fail. You must protect multiple accesses with a lock.
|
|
*/
|
|
static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
unsigned long old = *p;
|
|
|
|
*p = old | mask;
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/**
|
|
* __test_and_clear_bit - Clear a bit and return its old value
|
|
* @nr: Bit to clear
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is non-atomic and can be reordered.
|
|
* If two examples of this operation race, one can appear to succeed
|
|
* but actually fail. You must protect multiple accesses with a lock.
|
|
*/
|
|
static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
unsigned long old = *p;
|
|
|
|
*p = old & ~mask;
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/* WARNING: non atomic and it can be reordered! */
|
|
static inline int __test_and_change_bit(int nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
unsigned long old = *p;
|
|
|
|
*p = old ^ mask;
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/**
|
|
* test_bit - Determine whether a bit is set
|
|
* @nr: bit number to test
|
|
* @addr: Address to start counting from
|
|
*/
|
|
static inline int test_bit(int nr, const volatile unsigned long *addr)
|
|
{
|
|
return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
|
|
}
|
|
|
|
#endif /* __ASM_SH_BITOPS_OP32_H */
|