1 | /**************************************************************************** |
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2 | * This file defines various utility functions for the boot code. * |
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3 | * * |
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4 | * These functions are classified as follows: * |
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5 | * - Remote accesses, * |
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6 | * - Atomic operations, * |
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7 | * - Memory functions, * |
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8 | * - String functions, * |
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9 | * - Display functions, * |
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10 | * - Miscellaneous functions, * |
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11 | * * |
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12 | * Note that <stdint.h> and <stdarg.h> headers only contain macros, defined * |
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13 | * by the compiler itself, thus are accepted in the boot-loader, in * |
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14 | * constrast to other headers in the C standard library. * |
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15 | ****************************************************************************/ |
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16 | |
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17 | #ifndef _BOOT_UTILS_H |
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18 | #define _BOOT_UTILS_H |
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19 | |
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20 | #include <hal_types.h> |
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21 | #include <hard_config.h> |
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22 | |
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23 | /**************************************************************************** |
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24 | * Remote accesses. * |
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25 | ****************************************************************************/ |
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26 | |
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27 | /**************************************************************************** |
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28 | * This function reads an aligned 32-bit word from another memory address * |
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29 | * space. * |
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30 | * @ xp : extended pointer to the distant memory location to be read * |
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31 | * from. * |
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32 | * * |
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33 | * @ returns the value read. * |
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34 | ****************************************************************************/ |
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35 | uint32_t boot_remote_lw(xptr_t xp); |
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36 | |
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37 | /**************************************************************************** |
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38 | * This function writes an aligned 32-bit word in another memory address * |
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39 | * space. * |
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40 | * @ xp : extended pointer to the distant memory location to be written * |
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41 | * to. * |
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42 | * @ data : data value to be written to the distant memory location. * |
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43 | ****************************************************************************/ |
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44 | void boot_remote_sw(xptr_t xp, uint32_t data); |
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45 | |
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46 | /**************************************************************************** |
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47 | * This function atomically adds an value 'val' to the current value stored * |
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48 | * at a distant memory location pointed to by the extended pointer 'xp'. * |
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49 | * @ xp : extended pointer to the distant memory location whose value * |
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50 | * is to be modified. * |
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51 | * @ val : signed value to be added. * |
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52 | * * |
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53 | * @ returns the value stored at the distant memory location BEFORE the * |
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54 | * atomic operation. * |
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55 | ****************************************************************************/ |
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56 | int32_t boot_remote_atomic_add(xptr_t xp, int32_t val); |
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57 | |
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58 | /**************************************************************************** |
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59 | * This function copies 'size' bytes from the buffer pointed to by 'src' * |
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60 | * to the buffer pointed to by 'dest'. These 2 addresses may be in any * |
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61 | * different memory address spaces. * |
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62 | * @ dest : extended pointer to the destination buffer. * |
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63 | * @ src : extended pointer to the source buffer. * |
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64 | * @ size : size of memory block to be copied (in bytes). * |
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65 | ****************************************************************************/ |
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66 | void boot_remote_memcpy(xptr_t dest, xptr_t src, unsigned int size); |
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67 | |
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68 | /**************************************************************************** |
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69 | * Atomic operations. * |
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70 | ****************************************************************************/ |
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71 | |
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72 | /**************************************************************************** |
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73 | * This function atomically adds an value 'val' to the current variable * |
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74 | * pointed to by 'ptr'. It only returns when the atomic operation is * |
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75 | * successful. * |
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76 | * @ ptr : pointer to the variable to be modified. * |
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77 | * @ val : signed value to be added. * |
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78 | * * |
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79 | * @ returns the value of the variable BEFORE the atomic operation. * |
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80 | ****************************************************************************/ |
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81 | int32_t boot_atomic_add(int32_t* ptr, int32_t val); |
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82 | |
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83 | /**************************************************************************** |
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84 | * Memory functions. * |
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85 | ****************************************************************************/ |
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86 | |
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87 | /**************************************************************************** |
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88 | * This function performs a local memory copy (destination and source * |
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89 | * addresses are in the same memory space) of 'size' bytes from 'src' * |
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90 | * address to 'dest' address. * |
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91 | * @ dest : destination physical address, * |
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92 | * @ src : source physical address, * |
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93 | * @ size : size of memory block to be copied in bytes. * |
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94 | ****************************************************************************/ |
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95 | void boot_memcpy(void* dest, void* src, unsigned int size); |
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96 | |
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97 | /**************************************************************************** |
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98 | * This function fills the first 'size' bytes of the local memory area, * |
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99 | * pointed to by 'base' with a constant value 'val'. * |
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100 | * @ base : base address of the memory area to be initialized, * |
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101 | * @ val : value of the constant byte to initialize the area, * |
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102 | * @ size : size of memory block to be filled in bytes. * |
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103 | ****************************************************************************/ |
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104 | void boot_memset(void* base, int val, unsigned int size); |
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105 | |
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106 | /**************************************************************************** |
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107 | * String functions * |
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108 | ****************************************************************************/ |
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109 | |
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110 | /**************************************************************************** |
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111 | * This function converts the letter 'c' to lower case, if possible. * |
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112 | * @ c : letter to be converted. * |
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113 | * * |
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114 | * @ returns the converted letter, or 'c' if the conversion was not * |
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115 | * possible. * |
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116 | ****************************************************************************/ |
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117 | static inline unsigned char boot_to_lower(unsigned char c) |
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118 | { |
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119 | return ((c >= 'A') && (c <= 'Z')) ? (c | 0x20) : c; |
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120 | |
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121 | } // boot_to_lower() |
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122 | |
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123 | /**************************************************************************** |
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124 | * This function converts the letter 'c' to upper case, if possible. * |
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125 | * @ c : letter to be converted. * |
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126 | * * |
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127 | * @ returns the converted letter, or 'c' if the conversion was not * |
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128 | * possible. * |
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129 | ****************************************************************************/ |
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130 | static inline unsigned char boot_to_upper(unsigned char c) |
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131 | { |
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132 | return ((c >= 'a') && (c <= 'z')) ? (c & ~(0x20)) : c; |
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133 | |
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134 | } // boot_to_upper() |
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135 | |
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136 | /**************************************************************************** |
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137 | * This function copies the string pointed to by 'src' (the terminating * |
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138 | * null byte '\0' NOT included) to the buffer pointed to by 'dest'. * |
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139 | * @ src : pointer to the string to be copied. * |
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140 | * @ dest : pointer to the destination string. * |
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141 | ****************************************************************************/ |
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142 | void boot_strcpy(char* dest, char* src); |
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143 | |
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144 | /**************************************************************************** |
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145 | * This function calculates the length of the string pointed to by 's', * |
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146 | * excluding the terminating null byte '\0'. * |
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147 | * @ s : pointer to the string whose length is to be computed. * |
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148 | * * |
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149 | * @ returns the number of bytes in the string. * |
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150 | ****************************************************************************/ |
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151 | unsigned int boot_strlen(char* s); |
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152 | |
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153 | /**************************************************************************** |
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154 | * This function compares the 2 strings pointed to by 's1' and 's2'. * |
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155 | * @ s1 : pointer to the first string to be compared. * |
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156 | * @ s2 : pointer to the second string to be compared. * |
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157 | * * |
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158 | * @ returns 0 if these 2 strings match, 1 otherwise. * |
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159 | ****************************************************************************/ |
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160 | int boot_strcmp(char* s1, char* s2); |
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161 | |
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162 | /**************************************************************************** |
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163 | * Display functions * |
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164 | ****************************************************************************/ |
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165 | |
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166 | /**************************************************************************** |
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167 | * This function writes the NUL terminated string pointed to by 'str' to * |
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168 | * the boot TTY terminal. * |
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169 | * @ str : pointer to the string to be printed on the boot TTY terminal. * |
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170 | ****************************************************************************/ |
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171 | void boot_puts(char* str); |
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172 | |
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173 | /**************************************************************************** |
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174 | * This function produces output, according to the 'format' format, to the * |
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175 | * boot TTY terminal. * |
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176 | * @ format : the string defining the format of the output. It is composed * |
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177 | * of 0 or more directives: * |
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178 | * - ordinary characters (not %), which are copied unchanged to * |
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179 | * the boot TTY terminal. * |
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180 | * - conversion specifications (introduced by the character %, * |
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181 | * ended by a conversion specifier), each of which results in * |
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182 | * fetching 0 or more subsequent arguments. The arguments must * |
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183 | * correspond properly (after type promotion) with the * |
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184 | * conversion specifier. * |
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185 | * * |
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186 | * Conversion specifiers: * |
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187 | * - %d : 32-bit signed decimal notation of an integer, * |
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188 | * - %u : 32-bit unsigned decimal notation of an integer, * |
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189 | * - %x : 32-bit unsigned hexadecimal notation of an integer, * |
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190 | * - %l : 64-bit unsigned hexadecimal notation of an integer, * |
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191 | * - %c : character, * |
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192 | * - %s : NUL terminated string. * |
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193 | ****************************************************************************/ |
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194 | void boot_printf(char* format, ...); |
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195 | |
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196 | /**************************************************************************** |
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197 | * Misc. functions. * |
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198 | ****************************************************************************/ |
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199 | |
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200 | /**************************************************************************** |
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201 | * This function causes a termination during the boot procedure once the * |
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202 | * boot code detects an error. * |
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203 | ****************************************************************************/ |
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204 | void boot_exit() __attribute__((noreturn)); |
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205 | |
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206 | /**************************************************************************** |
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207 | * This function returns the cycle count stored in the CP0_COUNT register * |
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208 | * of the currently running processor. * |
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209 | * * |
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210 | * @ returns the processor cycle count. * |
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211 | ****************************************************************************/ |
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212 | unsigned int boot_get_proctime(); |
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213 | |
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214 | /**************************************************************************** |
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215 | * This function returns the global hardware identifier gid stored in the * |
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216 | * CP0_PROCID register of the currently running processor. * |
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217 | * * |
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218 | * @ returns the processor gid. * |
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219 | ****************************************************************************/ |
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220 | unsigned int boot_get_procid(); |
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221 | |
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222 | /**************************************************************************** |
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223 | * This structure defines a toggling barrier, that can be used to * |
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224 | * synchronize a group of cores, whether or not they are in a same cluster, * |
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225 | * without any specific initialization. * |
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226 | ****************************************************************************/ |
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227 | typedef struct boot_barrier_s |
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228 | { |
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229 | uint32_t current; // Number of arrived cores |
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230 | uint32_t sense; // Toggle barrier state |
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231 | uint32_t pad[(CACHE_LINE_SIZE>>2)-2]; // Padding |
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232 | } |
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233 | boot_barrier_t; |
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234 | |
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235 | /**************************************************************************** |
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236 | * This function blocks all processors arriving at the barrier pointed to * |
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237 | * by the extend pointer 'xp_barrier' and only returns when all 'count' * |
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238 | * expected processors reach the barrier. * |
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239 | * @ xp_barrier : extended pointer to a toggling barrier. * |
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240 | * @ count : number of expected processors. * |
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241 | ****************************************************************************/ |
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242 | void boot_barrier( xptr_t xp_barrier, |
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243 | uint32_t count ); |
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244 | |
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245 | |
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246 | #endif // _BOOT_UTILS_H |
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