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