223 lines
5.7 KiB
C
223 lines
5.7 KiB
C
/*-
|
|
* Copyright (c) 1998 Doug Rabson
|
|
* Copyright (c) 2017 Intel Corporation
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef BITS_H
|
|
#define BITS_H
|
|
|
|
#define BUS_LOCK "lock ; "
|
|
|
|
/**
|
|
*
|
|
* fls - Find the Last (most significant) bit Set in value and
|
|
* return the bit index of that bit.
|
|
*
|
|
* Bits are numbered starting at 0,the least significant bit.
|
|
* A return value of -1 means that the argument was zero.
|
|
*
|
|
* Examples:
|
|
* fls (0x0) = -1
|
|
* fls (0x01) = 0
|
|
* fls (0xf0) = 7
|
|
* ...
|
|
* fls (0x80000001) = 31
|
|
*
|
|
* @param value: 'unsigned int' type value
|
|
*
|
|
* @return value: zero-based bit index, -1 means 'value' was zero.
|
|
*
|
|
* **/
|
|
static inline int fls(unsigned int value)
|
|
{
|
|
int ret;
|
|
|
|
asm volatile("bsrl %1,%0"
|
|
: "=r" (ret)
|
|
: "rm" (value), "0" (-1));
|
|
return ret;
|
|
}
|
|
|
|
static inline int fls64(unsigned long value)
|
|
{
|
|
int ret;
|
|
|
|
asm volatile("bsrq %1,%q0"
|
|
: "=r" (ret)
|
|
: "rm" (value), "0" (-1));
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* ffs64 - Find the First (least significant) bit Set in value(Long type)
|
|
* and return the index of that bit.
|
|
*
|
|
* Bits are numbered starting at 0,the least significant bit.
|
|
* A return value of -1 means that the argument was zero.
|
|
*
|
|
* Examples:
|
|
* ffs64 (0x0) = -1
|
|
* ffs64 (0x01) = 0
|
|
* ffs64 (0xf0) = 4
|
|
* ffs64 (0xf00) = 8
|
|
* ...
|
|
* ffs64 (0x8000000000000001) = 0
|
|
* ffs64 (0xf000000000000000) = 60
|
|
*
|
|
* @param value: 'unsigned long' type value
|
|
*
|
|
* @return value: zero-based bit index, -1 means 'value' was zero.
|
|
*
|
|
* **/
|
|
static inline int ffs64(unsigned long value)
|
|
{
|
|
int ret;
|
|
asm volatile("bsfq %1,%q0"
|
|
: "=r" (ret)
|
|
: "rm" (value), "0" (-1));
|
|
return ret;
|
|
}
|
|
|
|
/*bit scan forward for the least significant bit '0'*/
|
|
static inline int ffz64(unsigned long value)
|
|
{
|
|
return ffs64(~value);
|
|
}
|
|
|
|
/**
|
|
* Counts leading zeros.
|
|
*
|
|
* The number of leading zeros is defined as the number of
|
|
* most significant bits which are not '1'. E.g.:
|
|
* clz(0x80000000)==0
|
|
* clz(0x40000000)==1
|
|
* ...
|
|
* clz(0x00000001)==31
|
|
* clz(0x00000000)==32
|
|
*
|
|
* @param value:The 32 bit value to count the number of leading zeros.
|
|
*
|
|
* @return The number of leading zeros in 'value'.
|
|
*/
|
|
static inline int clz(unsigned int value)
|
|
{
|
|
return (31 - fls(value));
|
|
}
|
|
|
|
/**
|
|
* Counts leading zeros (64 bit version).
|
|
*
|
|
* @param value:The 64 bit value to count the number of leading zeros.
|
|
*
|
|
* @return The number of leading zeros in 'value'.
|
|
*/
|
|
static inline int clz64(unsigned long value)
|
|
{
|
|
return (63 - fls64(value));
|
|
}
|
|
|
|
/*
|
|
* (*addr) |= (1UL<<nr);
|
|
*/
|
|
#define build_bitmap_set(name, lock, nr, addr) \
|
|
static inline void name(int nr, volatile unsigned long *addr) \
|
|
{ \
|
|
asm volatile(lock "orq %1,%0" \
|
|
: "+m" (*addr) \
|
|
: "r" (1UL<<nr) \
|
|
: "cc", "memory"); \
|
|
}
|
|
build_bitmap_set(__bitmap_set, "", nr, addr)
|
|
build_bitmap_set(bitmap_set, BUS_LOCK, nr, addr)
|
|
|
|
/*
|
|
* (*addr) &= ~(1UL<<nr);
|
|
*/
|
|
#define build_bitmap_clear(name, lock, nr, addr) \
|
|
static inline void name(int nr, volatile unsigned long *addr) \
|
|
{ \
|
|
asm volatile(lock "andq %1,%0" \
|
|
: "+m" (*addr) \
|
|
: "r" (~(1UL<<nr)) \
|
|
: "cc", "memory"); \
|
|
}
|
|
build_bitmap_clear(__bitmap_clear, "", nr, addr)
|
|
build_bitmap_clear(bitmap_clear, BUS_LOCK, nr, addr)
|
|
|
|
/*
|
|
* return !!((*addr) & (1UL<<nr));
|
|
*/
|
|
static inline bool bitmap_test(int nr, volatile unsigned long *addr)
|
|
{
|
|
int32_t ret;
|
|
|
|
asm volatile("btq %2,%1\n\tsbbl %0, %0"
|
|
: "=r" (ret), "=m" (*addr)
|
|
: "r" ((long)(nr & 0x3f))
|
|
: "cc", "memory");
|
|
return (ret != 0);
|
|
}
|
|
|
|
/*
|
|
* bool ret = (*addr) & (1UL<<nr);
|
|
* (*addr) |= (1UL<<nr);
|
|
* return ret;
|
|
*/
|
|
#define build_bitmap_testandset(name, lock, nr, addr) \
|
|
static inline bool name(int nr, volatile unsigned long *addr) \
|
|
{ \
|
|
int32_t ret; \
|
|
asm volatile(lock "btsq %2,%1\n\tsbbl %0,%0" \
|
|
: "=r" (ret), "=m" (*addr) \
|
|
: "r" ((long)(nr & 0x3f)) \
|
|
: "cc", "memory"); \
|
|
return (ret != 0); \
|
|
}
|
|
build_bitmap_testandset(__bitmap_test_and_set, "", nr, addr)
|
|
build_bitmap_testandset(bitmap_test_and_set, BUS_LOCK, nr, addr)
|
|
|
|
/*
|
|
* bool ret = (*addr) & (1UL<<nr);
|
|
* (*addr) &= ~(1UL<<nr);
|
|
* return ret;
|
|
*/
|
|
#define build_bitmap_testandclear(name, lock, nr, addr) \
|
|
static inline bool name(int nr, volatile unsigned long *addr) \
|
|
{ \
|
|
int32_t ret; \
|
|
asm volatile(lock "btrq %2,%1\n\tsbbl %0,%0" \
|
|
: "=r" (ret), "=m" (*addr) \
|
|
: "r" ((long)(nr & 0x3f)) \
|
|
: "cc", "memory"); \
|
|
return (ret != 0); \
|
|
}
|
|
build_bitmap_testandclear(__bitmap_test_and_clear, "", nr, addr)
|
|
build_bitmap_testandclear(bitmap_test_and_clear, BUS_LOCK, nr, addr)
|
|
|
|
#endif /* BITS_H*/
|