[1] | 1 | /* |
---|
| 2 | * bits.h - bits manipulation helper functions |
---|
| 3 | * |
---|
| 4 | * Author Ghassan Almaless (2008,2009,2010,2011,2012) |
---|
| 5 | * Alain Greiner (2016) |
---|
| 6 | * |
---|
| 7 | * Copyright (c) UPMC Sorbonne Universites |
---|
| 8 | * |
---|
| 9 | * This file is part of ALMOS-MKH. |
---|
| 10 | * |
---|
| 11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
---|
| 12 | * under the terms of the GNU General Public License as published by |
---|
| 13 | * the Free Software Foundation; version 2.0 of the License. |
---|
| 14 | * |
---|
| 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
---|
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
| 18 | * General Public License for more details. |
---|
| 19 | * |
---|
| 20 | * You should have received a copy of the GNU General Public License |
---|
| 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
---|
| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
---|
| 23 | */ |
---|
| 24 | |
---|
| 25 | #ifndef _BITS_H_ |
---|
| 26 | #define _BITS_H_ |
---|
| 27 | |
---|
[14] | 28 | #include <kernel_config.h> |
---|
[1] | 29 | #include <hal_types.h> |
---|
| 30 | |
---|
| 31 | /********************************************************************************************* |
---|
[204] | 32 | * These macros are NOT used by the bitmap, but can be useful in other contexts... [AG] |
---|
[1] | 33 | *********************************************************************************************/ |
---|
| 34 | |
---|
| 35 | #define ARROUND_UP(val, size) (((val) & ((size) -1)) ? ((val) & ~((size)-1)) + (size) : (val)) |
---|
| 36 | #define ARROUND_DOWN(val, size) ((val) & ~((size) - 1)) |
---|
| 37 | |
---|
| 38 | #define ABS(x) (((x) < 0) ? -(x) : (x)) |
---|
| 39 | #define MIN(x,y) (((x) < (y)) ? (x) : (y)) |
---|
| 40 | #define MAX(x,y) (((x) < (y)) ? (y) : (x)) |
---|
| 41 | |
---|
| 42 | /********************************************************************************************** |
---|
| 43 | * This macro returns the smallest power of 2 value, that is larger or equal to data value. |
---|
| 44 | * It returns 0xFFFFFFFF if data is larger than 0x80000000. |
---|
| 45 | *********************************************************************************************/ |
---|
| 46 | #define POW2_ROUNDUP(data) ( (data <= 0x00000001) ? 0x00000001 : \ |
---|
| 47 | (data <= 0x00000002) ? 0x00000002 : \ |
---|
| 48 | (data <= 0x00000004) ? 0x00000004 : \ |
---|
| 49 | (data <= 0x00000008) ? 0x00000008 : \ |
---|
| 50 | (data <= 0x00000010) ? 0x00000010 : \ |
---|
| 51 | (data <= 0x00000020) ? 0x00000020 : \ |
---|
| 52 | (data <= 0x00000040) ? 0x00000040 : \ |
---|
| 53 | (data <= 0x00000080) ? 0x00000080 : \ |
---|
| 54 | (data <= 0x00000100) ? 0x00000100 : \ |
---|
| 55 | (data <= 0x00000200) ? 0x00000200 : \ |
---|
| 56 | (data <= 0x00000400) ? 0x00000400 : \ |
---|
| 57 | (data <= 0x00000800) ? 0x00000800 : \ |
---|
| 58 | (data <= 0x00001000) ? 0x00001000 : \ |
---|
| 59 | (data <= 0x00002000) ? 0x00002000 : \ |
---|
| 60 | (data <= 0x00004000) ? 0x00004000 : \ |
---|
| 61 | (data <= 0x00008000) ? 0x00008000 : \ |
---|
| 62 | (data <= 0x00010000) ? 0x00010000 : \ |
---|
| 63 | (data <= 0x00020000) ? 0x00020000 : \ |
---|
| 64 | (data <= 0x00040000) ? 0x00040000 : \ |
---|
| 65 | (data <= 0x00080000) ? 0x00080000 : \ |
---|
| 66 | (data <= 0x00100000) ? 0x00100000 : \ |
---|
| 67 | (data <= 0x00200000) ? 0x00200000 : \ |
---|
| 68 | (data <= 0x00400000) ? 0x00400000 : \ |
---|
| 69 | (data <= 0x00800000) ? 0x00800000 : \ |
---|
| 70 | (data <= 0x01000000) ? 0x01000000 : \ |
---|
| 71 | (data <= 0x02000000) ? 0x02000000 : \ |
---|
| 72 | (data <= 0x04000000) ? 0x04000000 : \ |
---|
| 73 | (data <= 0x08000000) ? 0x08000000 : \ |
---|
| 74 | (data <= 0x10000000) ? 0x10000000 : \ |
---|
| 75 | (data <= 0x20000000) ? 0x20000000 : \ |
---|
| 76 | (data <= 0x40000000) ? 0x40000000 : \ |
---|
| 77 | (data <= 0x80000000) ? 0x80000000 : 0xFFFFFFFF ) |
---|
| 78 | |
---|
| 79 | /********************************************************************************************** |
---|
[23] | 80 | * This macro returns the number of 32 bits words required to register <size> entries. |
---|
[1] | 81 | *********************************************************************************************/ |
---|
| 82 | |
---|
| 83 | #define BITMAP_SIZE(size) ( ((size) & 31) ? (((size)>>5) + 1) : ((size)>>5) ) |
---|
| 84 | |
---|
| 85 | typedef uint32_t bitmap_t; |
---|
| 86 | |
---|
[23] | 87 | /********************************************************************************************* |
---|
| 88 | * This function reset all bits in a bitmap. (array ot 32 bits words). |
---|
| 89 | ********************************************************************************************* |
---|
| 90 | * @ bitmap : pointer on first word in the bitmap. |
---|
| 91 | * @ len : number of bits to reset. |
---|
| 92 | ********************************************************************************************/ |
---|
| 93 | void bitmap_init( bitmap_t * bitmap, |
---|
| 94 | uint32_t len ); |
---|
| 95 | |
---|
| 96 | /********************************************************************************************* |
---|
[1] | 97 | * This function set a specific bit in a bitmap. |
---|
[23] | 98 | ********************************************************************************************* |
---|
[1] | 99 | * @ bitmap : pointer on the bitmap |
---|
| 100 | * @ index : bit index in the bitmap |
---|
[23] | 101 | ********************************************************************************************/ |
---|
[1] | 102 | extern inline void bitmap_set( bitmap_t * bitmap, |
---|
| 103 | uint32_t index ); |
---|
| 104 | |
---|
[23] | 105 | /********************************************************************************************* |
---|
[1] | 106 | * This function clear a specific bit in a bitmap. |
---|
[23] | 107 | ********************************************************************************************* |
---|
[1] | 108 | * @ bitmap : pointer on the bitmap |
---|
| 109 | * @ index : bit index in the bitmap |
---|
[23] | 110 | ********************************************************************************************/ |
---|
[1] | 111 | extern inline void bitmap_clear( bitmap_t * bitmap, |
---|
| 112 | uint32_t index ); |
---|
| 113 | |
---|
[23] | 114 | /********************************************************************************************* |
---|
[1] | 115 | * This function returns a specific bit in a bitmap. |
---|
[23] | 116 | ********************************************************************************************* |
---|
[1] | 117 | * @ bitmap : pointer on the bitmap |
---|
| 118 | * @ index : bit index in the bitmap |
---|
[23] | 119 | * @ returns true if bitmap[index] is set |
---|
| 120 | ********************************************************************************************/ |
---|
[1] | 121 | extern inline bool_t bitmap_state( bitmap_t * bitmap, |
---|
| 122 | uint32_t index ); |
---|
| 123 | |
---|
[23] | 124 | /********************************************************************************************* |
---|
[1] | 125 | * This function set a range of bits in a bitmap : [index ... (index + len)[ |
---|
[23] | 126 | ********************************************************************************************* |
---|
[1] | 127 | * @ bitmap : pointer on the bitmap |
---|
| 128 | * @ index : first bit index in the bitmap |
---|
| 129 | * @ len : number of bits to set |
---|
[23] | 130 | ********************************************************************************************/ |
---|
[1] | 131 | extern void bitmap_set_range( bitmap_t * bitmap, |
---|
| 132 | uint32_t index, |
---|
| 133 | uint32_t len ); |
---|
| 134 | |
---|
[23] | 135 | /********************************************************************************************* |
---|
[1] | 136 | * This function reset a range of bits in a bitmap : [index ... (index + len)[ |
---|
[23] | 137 | ********************************************************************************************* |
---|
[1] | 138 | * @ bitmap : pointer on the bitmap |
---|
| 139 | * @ index : first bit index in the bitmap |
---|
| 140 | * @ len : number of bits to clear |
---|
[23] | 141 | ********************************************************************************************/ |
---|
[1] | 142 | extern void bitmap_clear_range( bitmap_t * bitmap, |
---|
| 143 | uint32_t index, |
---|
| 144 | uint32_t len ); |
---|
| 145 | |
---|
[23] | 146 | /********************************************************************************************* |
---|
[1] | 147 | * This function returns the index of first bit set in a bitmap, starting from index. |
---|
[23] | 148 | ********************************************************************************************* |
---|
[1] | 149 | * @ bitmap : pointer on the bitmap |
---|
| 150 | * @ index : first bit to analyse in the bitmap |
---|
| 151 | * @ size : number of bits to analyse in bitmap |
---|
| 152 | * @ returns index if found / returns 0xFFFFFFFF if bit not found |
---|
[23] | 153 | ********************************************************************************************/ |
---|
[1] | 154 | extern uint32_t bitmap_ffs2( bitmap_t * bitmap, |
---|
| 155 | uint32_t index, |
---|
| 156 | uint32_t size ); |
---|
| 157 | |
---|
[23] | 158 | /********************************************************************************************* |
---|
[1] | 159 | * This function returns the index of first bit cleared in a bitmap, starting from index. |
---|
[23] | 160 | ********************************************************************************************* |
---|
[1] | 161 | * @ bitmap : pointer on the bitmap |
---|
| 162 | * @ index : first bit to analyse in the bitmap |
---|
| 163 | * @ size : number of bits to analyse in bitmap |
---|
| 164 | * @ returns index if found / returns 0xFFFFFFFF if bit not found |
---|
[23] | 165 | ********************************************************************************************/ |
---|
[1] | 166 | extern uint32_t bitmap_ffc2( bitmap_t * bitmap, |
---|
| 167 | uint32_t index, |
---|
| 168 | uint32_t size ); |
---|
| 169 | |
---|
[23] | 170 | /********************************************************************************************* |
---|
[1] | 171 | * This function returns the index of first bit set in a bitmap, starting from bit 0. |
---|
[23] | 172 | ********************************************************************************************* |
---|
[1] | 173 | * @ bitmap : pointer on the bitmap |
---|
| 174 | * @ size : number of bits to analyse in bitmap |
---|
| 175 | * @ returns index if found / returns 0xFFFFFFFF if bit not found |
---|
[23] | 176 | ********************************************************************************************/ |
---|
[1] | 177 | extern uint32_t bitmap_ffs( bitmap_t * bitmap, |
---|
| 178 | uint32_t size ); |
---|
| 179 | |
---|
[23] | 180 | /********************************************************************************************* |
---|
[1] | 181 | * This function returns the index of first bit cleared in a bitmap, starting from bit 0. |
---|
[23] | 182 | ********************************************************************************************* |
---|
[1] | 183 | * @ bitmap : pointer on the bitmap |
---|
| 184 | * @ size : number of bits to alalyse in bitmap |
---|
| 185 | * @ returns index if found / returns 0xFFFFFFFF if bit not found |
---|
[23] | 186 | ********************************************************************************************/ |
---|
[1] | 187 | extern uint32_t bitmap_ffc( bitmap_t * bitmap, |
---|
| 188 | uint32_t size ); |
---|
| 189 | |
---|
[23] | 190 | /********************************************************************************************* |
---|
[1] | 191 | * This function returns the number of bits to code a non-zero unsigned integer value. |
---|
[23] | 192 | ********************************************************************************************* |
---|
[1] | 193 | * @ val : value to analyse |
---|
| 194 | * @ returns number of bits |
---|
[23] | 195 | ********************************************************************************************/ |
---|
[1] | 196 | static inline uint32_t bits_nr( uint32_t val ) |
---|
| 197 | { |
---|
| 198 | register uint32_t i; |
---|
| 199 | |
---|
| 200 | for( i=0 ; val > 0 ; i++ ) |
---|
| 201 | val = val >> 1; |
---|
| 202 | |
---|
| 203 | return i; |
---|
| 204 | } |
---|
| 205 | |
---|
[23] | 206 | /********************************************************************************************* |
---|
[1] | 207 | * This function takes an unsigned integer value as input argument, and returns another |
---|
| 208 | * unsigned integer, that is the (base 2) logarithm of the smallest power of 2 contained |
---|
| 209 | * in the input value. |
---|
[23] | 210 | ********************************************************************************************* |
---|
[1] | 211 | * @ val : value to analyse |
---|
| 212 | * @ returns logarithm value |
---|
[23] | 213 | ********************************************************************************************/ |
---|
[1] | 214 | static inline uint32_t bits_log2( uint32_t val ) |
---|
| 215 | { |
---|
| 216 | return (val == 0) ? 1 : bits_nr( val ) - 1; |
---|
| 217 | } |
---|
| 218 | |
---|
| 219 | #endif /* _BITS_H_ */ |
---|