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lib: Simple bitmap library

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We add simple bitmap library which will help us create and maintain
bitmaps. It will also help us create a simple HART mask library.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2020-03-04 12:29:15 +05:30 committed by Anup Patel
parent 078686d75c
commit 3226bd93ce
3 changed files with 169 additions and 0 deletions
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128
include/sbi/sbi_bitmap.h Normal file
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@ -0,0 +1,128 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __SBI_BITMAP_H__
#define __SBI_BITMAP_H__
#include <sbi/sbi_bitops.h>
#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) % BITS_PER_LONG))
#define BITMAP_LAST_WORD_MASK(nbits) \
( \
((nbits) % BITS_PER_LONG) ? \
((1UL << ((nbits) % BITS_PER_LONG)) - 1) : ~0UL \
)
#define small_const_nbits(nbits) \
(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
#define DECLARE_BITMAP(name, nbits) unsigned long name[BITS_TO_LONGS(nbits)]
#define DEFINE_BITMAP(name) extern unsigned long name[]
static inline unsigned long bitmap_estimate_size(int nbits)
{
return (BITS_TO_LONGS(nbits) * sizeof(unsigned long));
}
void __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits);
void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits);
void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits);
static inline void bitmap_set(unsigned long *bmap, int start, int len)
{
int bit;
for (bit = start; bit < (start + len); bit++)
bmap[BIT_WORD(bit)] |= (0x1UL << BIT_WORD_OFFSET(bit));
}
static inline void bitmap_clear(unsigned long *bmap, int start, int len)
{
int bit;
for (bit = start; bit < (start + len); bit++)
bmap[BIT_WORD(bit)] &= ~(0x1UL << BIT_WORD_OFFSET(bit));
}
static inline void bitmap_zero(unsigned long *dst, int nbits)
{
if (small_const_nbits(nbits))
*dst = 0UL;
else {
size_t i, len = BITS_TO_LONGS(nbits);
for (i = 0; i < len; i++)
dst[i] = 0;
}
}
static inline void bitmap_zero_except(unsigned long *dst,
int exception, int nbits)
{
if (small_const_nbits(nbits))
*dst = 0UL;
else {
size_t i, len = BITS_TO_LONGS(nbits);
for (i = 0; i < len; i++)
dst[i] = 0;
}
if (exception < nbits)
__set_bit(exception, dst);
}
static inline void bitmap_fill(unsigned long *dst, int nbits)
{
size_t i, nlongs = BITS_TO_LONGS(nbits);
if (!small_const_nbits(nbits)) {
for (i = 0; i < (nlongs - 1); i++)
dst[i] = -1UL;
}
dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
}
static inline void bitmap_copy(unsigned long *dst,
const unsigned long *src, int nbits)
{
if (small_const_nbits(nbits))
*dst = *src;
else {
size_t i, len = BITS_TO_LONGS(nbits);
for (i = 0; i < len; i++)
dst[i] = src[i];
}
}
static inline void bitmap_and(unsigned long *dst, const unsigned long *src1,
const unsigned long *src2, int nbits)
{
if (small_const_nbits(nbits))
*dst = *src1 & *src2;
else
__bitmap_and(dst, src1, src2, nbits);
}
static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
const unsigned long *src2, int nbits)
{
if (small_const_nbits(nbits))
*dst = *src1 | *src2;
else
__bitmap_or(dst, src1, src2, nbits);
}
static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
const unsigned long *src2, int nbits)
{
if (small_const_nbits(nbits))
*dst = *src1 ^ *src2;
else
__bitmap_xor(dst, src1, src2, nbits);
}
#endif

1
lib/sbi/objects.mk
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@ -12,6 +12,7 @@ libsbi-objs-y += riscv_atomic.o
libsbi-objs-y += riscv_hardfp.o
libsbi-objs-y += riscv_locks.o
libsbi-objs-y += sbi_bitmap.o
libsbi-objs-y += sbi_bitops.o
libsbi-objs-y += sbi_console.o
libsbi-objs-y += sbi_ecall.o

40
lib/sbi/sbi_bitmap.c Normal file
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@ -0,0 +1,40 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/sbi_bitmap.h>
void __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits)
{
int k;
int nr = BITS_TO_LONGS(bits);
for (k = 0; k < nr; k++)
dst[k] = bitmap1[k] & bitmap2[k];
}
void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits)
{
int k;
int nr = BITS_TO_LONGS(bits);
for (k = 0; k < nr; k++)
dst[k] = bitmap1[k] | bitmap2[k];
}
void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits)
{
int k;
int nr = BITS_TO_LONGS(bits);
for (k = 0; k < nr; k++)
dst[k] = bitmap1[k] ^ bitmap2[k];
}