84803d7a27
Fix this error: CC bitops.o In file included from /src/qemu/bitops.c:14: /src/qemu/bitops.h:69: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'unsigned' Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
273 lines
6.3 KiB
C
273 lines
6.3 KiB
C
/*
|
|
* Bitops Module
|
|
*
|
|
* Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
|
|
*
|
|
* Mostly inspired by (stolen from) linux/bitmap.h and linux/bitops.h
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef BITOPS_H
|
|
#define BITOPS_H
|
|
|
|
#include "qemu-common.h"
|
|
|
|
#define BITS_PER_BYTE CHAR_BIT
|
|
#define BITS_PER_LONG (sizeof (unsigned long) * BITS_PER_BYTE)
|
|
|
|
#define BIT(nr) (1UL << (nr))
|
|
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
|
|
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
|
|
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
|
|
|
|
/**
|
|
* bitops_ffs - find first bit in word.
|
|
* @word: The word to search
|
|
*
|
|
* Undefined if no bit exists, so code should check against 0 first.
|
|
*/
|
|
static unsigned long bitops_ffsl(unsigned long word)
|
|
{
|
|
int num = 0;
|
|
|
|
#if LONG_MAX > 0x7FFFFFFF
|
|
if ((word & 0xffffffff) == 0) {
|
|
num += 32;
|
|
word >>= 32;
|
|
}
|
|
#endif
|
|
if ((word & 0xffff) == 0) {
|
|
num += 16;
|
|
word >>= 16;
|
|
}
|
|
if ((word & 0xff) == 0) {
|
|
num += 8;
|
|
word >>= 8;
|
|
}
|
|
if ((word & 0xf) == 0) {
|
|
num += 4;
|
|
word >>= 4;
|
|
}
|
|
if ((word & 0x3) == 0) {
|
|
num += 2;
|
|
word >>= 2;
|
|
}
|
|
if ((word & 0x1) == 0) {
|
|
num += 1;
|
|
}
|
|
return num;
|
|
}
|
|
|
|
/**
|
|
* bitops_fls - find last (most-significant) set bit in a long word
|
|
* @word: the word to search
|
|
*
|
|
* Undefined if no set bit exists, so code should check against 0 first.
|
|
*/
|
|
static inline unsigned long bitops_flsl(unsigned long word)
|
|
{
|
|
int num = BITS_PER_LONG - 1;
|
|
|
|
#if LONG_MAX > 0x7FFFFFFF
|
|
if (!(word & (~0ul << 32))) {
|
|
num -= 32;
|
|
word <<= 32;
|
|
}
|
|
#endif
|
|
if (!(word & (~0ul << (BITS_PER_LONG-16)))) {
|
|
num -= 16;
|
|
word <<= 16;
|
|
}
|
|
if (!(word & (~0ul << (BITS_PER_LONG-8)))) {
|
|
num -= 8;
|
|
word <<= 8;
|
|
}
|
|
if (!(word & (~0ul << (BITS_PER_LONG-4)))) {
|
|
num -= 4;
|
|
word <<= 4;
|
|
}
|
|
if (!(word & (~0ul << (BITS_PER_LONG-2)))) {
|
|
num -= 2;
|
|
|
|
word <<= 2;
|
|
}
|
|
if (!(word & (~0ul << (BITS_PER_LONG-1))))
|
|
num -= 1;
|
|
return num;
|
|
}
|
|
|
|
/**
|
|
* ffz - find first zero in word.
|
|
* @word: The word to search
|
|
*
|
|
* Undefined if no zero exists, so code should check against ~0UL first.
|
|
*/
|
|
static inline unsigned long ffz(unsigned long word)
|
|
{
|
|
return bitops_ffsl(~word);
|
|
}
|
|
|
|
/**
|
|
* set_bit - Set a bit in memory
|
|
* @nr: the bit to set
|
|
* @addr: the address to start counting from
|
|
*/
|
|
static inline void set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p |= mask;
|
|
}
|
|
|
|
/**
|
|
* clear_bit - Clears a bit in memory
|
|
* @nr: Bit to clear
|
|
* @addr: Address to start counting from
|
|
*/
|
|
static inline void clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
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: Bit to change
|
|
* @addr: Address to start counting from
|
|
*/
|
|
static inline void change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
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
|
|
*/
|
|
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
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* test_and_change_bit - Change a bit and return its old value
|
|
* @nr: Bit to change
|
|
* @addr: Address to count from
|
|
*/
|
|
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)));
|
|
}
|
|
|
|
/**
|
|
* find_last_bit - find the last set bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit number of the first set bit, or size.
|
|
*/
|
|
unsigned long find_last_bit(const unsigned long *addr,
|
|
unsigned long size);
|
|
|
|
/**
|
|
* find_next_bit - find the next set bit in a memory region
|
|
* @addr: The address to base the search on
|
|
* @offset: The bitnumber to start searching at
|
|
* @size: The bitmap size in bits
|
|
*/
|
|
unsigned long find_next_bit(const unsigned long *addr,
|
|
unsigned long size, unsigned long offset);
|
|
|
|
/**
|
|
* find_next_zero_bit - find the next cleared bit in a memory region
|
|
* @addr: The address to base the search on
|
|
* @offset: The bitnumber to start searching at
|
|
* @size: The bitmap size in bits
|
|
*/
|
|
|
|
unsigned long find_next_zero_bit(const unsigned long *addr,
|
|
unsigned long size,
|
|
unsigned long offset);
|
|
|
|
/**
|
|
* find_first_bit - find the first set bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit number of the first set bit.
|
|
*/
|
|
static inline unsigned long find_first_bit(const unsigned long *addr,
|
|
unsigned long size)
|
|
{
|
|
return find_next_bit(addr, size, 0);
|
|
}
|
|
|
|
/**
|
|
* find_first_zero_bit - find the first cleared bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit number of the first cleared bit.
|
|
*/
|
|
static inline unsigned long find_first_zero_bit(const unsigned long *addr,
|
|
unsigned long size)
|
|
{
|
|
return find_next_zero_bit(addr, size, 0);
|
|
}
|
|
|
|
static inline unsigned long hweight_long(unsigned long w)
|
|
{
|
|
unsigned long count;
|
|
|
|
for (count = 0; w; w >>= 1) {
|
|
count += w & 1;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
#endif
|