mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-29 05:18:51 +09:00
![Grygorii Strashko](/assets/img/avatar_default.png)
Current implementation of find_next_zero_bit() is incompatible with arm64. Hence fix it by using BITS_PER_LONG define instead of constants and use generic ffz() implementation. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
184 lines
4.3 KiB
C
184 lines
4.3 KiB
C
/*
|
|
* Copyright 1995, Russell King.
|
|
* Various bits and pieces copyrights include:
|
|
* Linus Torvalds (test_bit).
|
|
*
|
|
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
|
|
*
|
|
* Please note that the code in this file should never be included
|
|
* from user space. Many of these are not implemented in assembler
|
|
* since they would be too costly. Also, they require priviledged
|
|
* instructions (which are not available from user mode) to ensure
|
|
* that they are atomic.
|
|
*/
|
|
|
|
#ifndef __ASM_ARM_BITOPS_H
|
|
#define __ASM_ARM_BITOPS_H
|
|
|
|
#include <asm-generic/bitops/__ffs.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/proc-armv/system.h>
|
|
|
|
#define smp_mb__before_clear_bit() do { } while (0)
|
|
#define smp_mb__after_clear_bit() do { } while (0)
|
|
|
|
/*
|
|
* Function prototypes to keep gcc -Wall happy.
|
|
*/
|
|
extern void set_bit(int nr, volatile void * addr);
|
|
|
|
extern void clear_bit(int nr, volatile void * addr);
|
|
|
|
extern void change_bit(int nr, volatile void * addr);
|
|
|
|
static inline void __change_bit(int nr, volatile void *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p ^= mask;
|
|
}
|
|
|
|
static inline int __test_and_set_bit(int nr, volatile void *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;
|
|
}
|
|
|
|
static inline int test_and_set_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long flags = 0;
|
|
int out;
|
|
|
|
local_irq_save(flags);
|
|
out = __test_and_set_bit(nr, addr);
|
|
local_irq_restore(flags);
|
|
|
|
return out;
|
|
}
|
|
|
|
static inline int __test_and_clear_bit(int nr, volatile void *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;
|
|
}
|
|
|
|
static inline int test_and_clear_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long flags = 0;
|
|
int out;
|
|
|
|
local_irq_save(flags);
|
|
out = __test_and_clear_bit(nr, addr);
|
|
local_irq_restore(flags);
|
|
|
|
return out;
|
|
}
|
|
|
|
extern int test_and_change_bit(int nr, volatile void * addr);
|
|
|
|
static inline int __test_and_change_bit(int nr, volatile void *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;
|
|
}
|
|
|
|
/*
|
|
* This routine doesn't need to be atomic.
|
|
*/
|
|
static inline int test_bit(int nr, const void * addr)
|
|
{
|
|
return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
|
|
}
|
|
|
|
static inline int __ilog2(unsigned int x)
|
|
{
|
|
return generic_fls(x) - 1;
|
|
}
|
|
|
|
#define ffz(x) __ffs(~(x))
|
|
|
|
static inline int find_next_zero_bit(void *addr, int size, int offset)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + (offset / BITS_PER_LONG);
|
|
unsigned long result = offset & ~(BITS_PER_LONG - 1);
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= (BITS_PER_LONG - 1);
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp |= ~0UL >> (BITS_PER_LONG - offset);
|
|
if (size < BITS_PER_LONG)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= BITS_PER_LONG;
|
|
result += BITS_PER_LONG;
|
|
}
|
|
while (size & ~(BITS_PER_LONG - 1)) {
|
|
tmp = *(p++);
|
|
if (~tmp)
|
|
goto found_middle;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp |= ~0UL << size;
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
}
|
|
|
|
/*
|
|
* hweightN: returns the hamming weight (i.e. the number
|
|
* of bits set) of a N-bit word
|
|
*/
|
|
|
|
#define hweight32(x) generic_hweight32(x)
|
|
#define hweight16(x) generic_hweight16(x)
|
|
#define hweight8(x) generic_hweight8(x)
|
|
|
|
#define find_first_zero_bit(addr, size) \
|
|
find_next_zero_bit((addr), (size), 0)
|
|
|
|
#define ext2_set_bit test_and_set_bit
|
|
#define ext2_clear_bit test_and_clear_bit
|
|
#define ext2_test_bit test_bit
|
|
#define ext2_find_first_zero_bit find_first_zero_bit
|
|
#define ext2_find_next_zero_bit find_next_zero_bit
|
|
|
|
/* Bitmap functions for the minix filesystem. */
|
|
#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
|
|
#define minix_set_bit(nr,addr) set_bit(nr,addr)
|
|
#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
|
|
#define minix_test_bit(nr,addr) test_bit(nr,addr)
|
|
#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#include <asm-generic/bitops/__fls.h>
|
|
#include <asm-generic/bitops/fls.h>
|
|
#include <asm-generic/bitops/fls64.h>
|
|
|
|
#endif /* _ARM_BITOPS_H */
|