mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-15 09:27:35 +00:00
9b0e3fd1c8
The generic bitops headers are required when calling logarithmic functions, such as ilog2(). Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Jagan Teki <jteki@openedev.com>
358 lines
7.2 KiB
C
358 lines
7.2 KiB
C
/*
|
|
* U-boot - bitops.h Routines for bit operations
|
|
*
|
|
* Copyright (c) 2005-2007 Analog Devices Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef _BLACKFIN_BITOPS_H
|
|
#define _BLACKFIN_BITOPS_H
|
|
|
|
/*
|
|
* Copyright 1992, Linus Torvalds.
|
|
*/
|
|
|
|
#include <asm/byteorder.h>
|
|
#include <asm/system.h>
|
|
#include <asm-generic/bitops/fls.h>
|
|
#include <asm-generic/bitops/__fls.h>
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/__ffs.h>
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* Function prototypes to keep gcc -Wall happy
|
|
*/
|
|
|
|
/*
|
|
* The __ functions are not atomic
|
|
*/
|
|
|
|
/*
|
|
* ffz = Find First Zero in word. Undefined if no zero exists,
|
|
* so code should check against ~0UL first..
|
|
*/
|
|
static __inline__ unsigned long ffz(unsigned long word)
|
|
{
|
|
unsigned long result = 0;
|
|
|
|
while (word & 1) {
|
|
result++;
|
|
word >>= 1;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static __inline__ void set_bit(int nr, volatile void *addr)
|
|
{
|
|
int *a = (int *)addr;
|
|
int mask;
|
|
unsigned long flags;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
local_irq_save(flags);
|
|
*a |= mask;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static __inline__ void __set_bit(int nr, volatile void *addr)
|
|
{
|
|
int *a = (int *)addr;
|
|
int mask;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
*a |= mask;
|
|
}
|
|
#define PLATFORM__SET_BIT
|
|
|
|
/*
|
|
* clear_bit() doesn't provide any barrier for the compiler.
|
|
*/
|
|
#define smp_mb__before_clear_bit() barrier()
|
|
#define smp_mb__after_clear_bit() barrier()
|
|
|
|
static __inline__ void clear_bit(int nr, volatile void *addr)
|
|
{
|
|
int *a = (int *)addr;
|
|
int mask;
|
|
unsigned long flags;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
local_irq_save(flags);
|
|
*a &= ~mask;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static __inline__ void change_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, flags;
|
|
unsigned long *ADDR = (unsigned long *)addr;
|
|
|
|
ADDR += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
local_irq_save(flags);
|
|
*ADDR ^= mask;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static __inline__ void __change_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask;
|
|
unsigned long *ADDR = (unsigned long *)addr;
|
|
|
|
ADDR += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
*ADDR ^= mask;
|
|
}
|
|
|
|
static __inline__ int test_and_set_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = (volatile unsigned int *)addr;
|
|
unsigned long flags;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
local_irq_save(flags);
|
|
retval = (mask & *a) != 0;
|
|
*a |= mask;
|
|
local_irq_restore(flags);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int __test_and_set_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = (volatile unsigned int *)addr;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
retval = (mask & *a) != 0;
|
|
*a |= mask;
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int test_and_clear_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = (volatile unsigned int *)addr;
|
|
unsigned long flags;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
local_irq_save(flags);
|
|
retval = (mask & *a) != 0;
|
|
*a &= ~mask;
|
|
local_irq_restore(flags);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int __test_and_clear_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = (volatile unsigned int *)addr;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
retval = (mask & *a) != 0;
|
|
*a &= ~mask;
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int test_and_change_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = (volatile unsigned int *)addr;
|
|
unsigned long flags;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
local_irq_save(flags);
|
|
retval = (mask & *a) != 0;
|
|
*a ^= mask;
|
|
local_irq_restore(flags);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int __test_and_change_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
volatile unsigned int *a = (volatile unsigned int *)addr;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
retval = (mask & *a) != 0;
|
|
*a ^= mask;
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* This routine doesn't need to be atomic.
|
|
*/
|
|
static __inline__ int __constant_test_bit(int nr, const volatile void *addr)
|
|
{
|
|
return ((1UL << (nr & 31)) &
|
|
(((const volatile unsigned int *)addr)[nr >> 5])) != 0;
|
|
}
|
|
|
|
static __inline__ int __test_bit(int nr, volatile void *addr)
|
|
{
|
|
int *a = (int *)addr;
|
|
int mask;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
return ((mask & *a) != 0);
|
|
}
|
|
|
|
#define test_bit(nr,addr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_test_bit((nr),(addr)) : \
|
|
__test_bit((nr),(addr)))
|
|
|
|
#define find_first_zero_bit(addr, size) \
|
|
find_next_zero_bit((addr), (size), 0)
|
|
|
|
static __inline__ int find_next_zero_bit(void *addr, int size, int offset)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + (offset >> 5);
|
|
unsigned long result = offset & ~31UL;
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp |= ~0UL >> (32 - offset);
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size & ~31UL) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
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)
|
|
|
|
static __inline__ int ext2_set_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
unsigned long flags;
|
|
volatile unsigned char *ADDR = (unsigned char *)addr;
|
|
|
|
ADDR += nr >> 3;
|
|
mask = 1 << (nr & 0x07);
|
|
local_irq_save(flags);
|
|
retval = (mask & *ADDR) != 0;
|
|
*ADDR |= mask;
|
|
local_irq_restore(flags);
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int ext2_clear_bit(int nr, volatile void *addr)
|
|
{
|
|
int mask, retval;
|
|
unsigned long flags;
|
|
volatile unsigned char *ADDR = (unsigned char *)addr;
|
|
|
|
ADDR += nr >> 3;
|
|
mask = 1 << (nr & 0x07);
|
|
local_irq_save(flags);
|
|
retval = (mask & *ADDR) != 0;
|
|
*ADDR &= ~mask;
|
|
local_irq_restore(flags);
|
|
return retval;
|
|
}
|
|
|
|
static __inline__ int ext2_test_bit(int nr, const volatile void *addr)
|
|
{
|
|
int mask;
|
|
const volatile unsigned char *ADDR = (const unsigned char *)addr;
|
|
|
|
ADDR += nr >> 3;
|
|
mask = 1 << (nr & 0x07);
|
|
return ((mask & *ADDR) != 0);
|
|
}
|
|
|
|
#define ext2_find_first_zero_bit(addr, size) \
|
|
ext2_find_next_zero_bit((addr), (size), 0)
|
|
|
|
static __inline__ unsigned long ext2_find_next_zero_bit(void *addr,
|
|
unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + (offset >> 5);
|
|
unsigned long result = offset & ~31UL;
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp |= ~0UL >> (32 - offset);
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size & ~31UL) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp |= ~0UL >> size;
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
}
|
|
|
|
/* 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
|
|
|
|
#endif
|