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/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef __NVGPU_POSIX_BITOPS_H__
#define __NVGPU_POSIX_BITOPS_H__
#include <nvgpu/types.h>
/*
* Assume an 8 bit byte, of course.
*/
#define BITS_PER_BYTE 8UL
#define BITS_PER_LONG (__SIZEOF_LONG__ * BITS_PER_BYTE)
#define BITS_TO_LONGS(bits) \
(bits + (BITS_PER_LONG - 1) / BITS_PER_LONG)
#define BIT(i) (1UL << (i))
#define GENMASK(h, l) \
(((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
#define DECLARE_BITMAP(bmap, bits) \
unsigned long bmap[BITS_TO_LONGS(bits)]
#define for_each_set_bit(bit, addr, size) \
for ((bit) = find_first_bit((addr), (size)); \
(bit) < (size); \
(bit) = find_next_bit((addr), (size), (bit) + 1))
#define ffs(word) __ffs(word)
#define ffz(word) __ffs(~(word))
#define fls(word) __fls(word)
/*
* Clashes with symbols in libc it seems.
*/
#define __ffs(word) __nvgpu_posix_ffs(word)
#define __fls(word) __nvgpu_posix_fls(word)
unsigned long __nvgpu_posix_ffs(unsigned long word);
unsigned long __nvgpu_posix_fls(unsigned long word);
unsigned long find_first_bit(const unsigned long *addr, unsigned long size);
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
unsigned long offset);
unsigned long find_first_zero_bit(const unsigned long *addr,
unsigned long size);
bool test_bit(int nr, const volatile unsigned long *addr);
bool test_and_set_bit(int nr, volatile unsigned long *addr);
bool test_and_clear_bit(int nr, volatile unsigned long *addr);
/*
* These two are atomic.
*/
void set_bit(int nr, volatile unsigned long *addr);
void clear_bit(int nr, volatile unsigned long *addr);
void bitmap_set(unsigned long *map, unsigned int start, int len);
void bitmap_clear(unsigned long *map, unsigned int start, int len);
unsigned long bitmap_find_next_zero_area_off(unsigned long *map,
unsigned long size,
unsigned long start,
unsigned int nr,
unsigned long align_mask,
unsigned long align_offset);
unsigned long bitmap_find_next_zero_area(unsigned long *map,
unsigned long size,
unsigned long start,
unsigned int nr,
unsigned long align_mask);
#endif
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