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annotate cos/kernel/kernel.h @ 240:6259856841a0

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author Windel Bouwman
date Mon, 22 Jul 2013 22:37:33 +0200
parents 35cc54e078dd
children
rev   line source
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1 #ifndef KERNEL_H
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2 #define KERNEL_H
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3
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4 // Include common functions, available to all!
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5 #define NULL ((void*)0)
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6
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7 /* Types */
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8
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9 // Type defs:
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10 typedef unsigned char uint8_t;
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11 typedef unsigned short uint16_t;
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12 typedef unsigned int uint32_t;
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13 typedef unsigned long int uint64_t;
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14 typedef long int int64_t;
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15
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16 _Static_assert(sizeof(uint8_t) == 1, "sizeof(uint8_t) != 1");
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17 _Static_assert(sizeof(uint16_t) == 2, "sizeof(uint16_t) != 2");
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18 _Static_assert(sizeof(uint32_t) == 4, "sizeof(uint32_t) != 4");
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19 _Static_assert(sizeof(uint64_t) == 8, "sizeof(uint64_t) != 8");
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20 _Static_assert(sizeof(int64_t) == 8, "sizeof(int64_t) != 8");
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21
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22 // IDT related structures:
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23 typedef struct {
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24 uint16_t baseLow;
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25 uint16_t selector;
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26 uint8_t reserved1;
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27 uint8_t flags;
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28 uint16_t baseMid;
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29 uint32_t baseHigh;
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30 uint32_t reserved2;
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31 } __attribute__((packed)) IDT_entry;
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32
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33 typedef struct {
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34 uint16_t limit;
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35 uint64_t base;
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36 } __attribute__((packed)) idtPointer;
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37
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38 // Multiboot structs:
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39 struct multiboot_aout_symbol_table {
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40 uint32_t tabsize;
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41 uint32_t strsize, addr, reserved;
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42 };
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43
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44 typedef struct multiboot_info_tag
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45 {
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46 uint32_t flags; // Multiboot flags / version
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47 uint32_t mem_lower; // available memory from BIOS
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48 uint32_t mem_upper;
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49 uint32_t boot_device;
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50 uint32_t cmdline; // COmmand line
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51 uint32_t mods_count;
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52 uint32_t mods_addr;
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53 union {
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54 struct multiboot_aout_symbol_table aout_sym;
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55 } u;
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56
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57 uint32_t mmap_length;
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58 uint32_t mmap_addr;
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59 } multiboot_info_t;
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60
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61 typedef struct memory_map_tag
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62 {
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63 uint32_t size;
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64 uint64_t base;
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65 uint64_t length;
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66 uint32_t type;
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67 } __attribute__((packed)) multiboot_memory_map_t;
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68
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69 typedef struct
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70 {
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71 uint32_t mod_start;
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72 uint32_t mod_end;
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73 uint32_t cmdline;
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74 uint32_t pad;
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75 } multiboot_module_t;
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76
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77 // Memory manager structures:
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78 typedef struct
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79 {
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80 uint64_t present : 1;
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81 uint64_t rw : 1;
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82 uint64_t us : 1; // user or supervisor
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83 uint64_t pwt : 1; // page level write-through
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84 uint64_t pcd : 1; // page cache disable
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85 uint64_t accessed : 1;
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86 uint64_t ignored : 1;
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87 uint64_t ps : 1; // must be 0.
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88 uint64_t ignored2 : 4;
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89 // 12 bits so far
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90 uint64_t address : 40; // address of page directory pointer table.
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91 uint64_t ignored3 : 11;
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92 uint64_t xd : 1; // execute disable
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93 } PML4E_t; // 64 bits wide, PML4 table must be 4096 byte aligned.
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94
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95 typedef struct
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96 {
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97 // Must be 12 bits aligned!
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98 PML4E_t table[512];
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99 uint64_t physicalAddress; // Physical address of the table above
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100 } PML4_t;
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101
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102 typedef struct
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103 {
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104 uint64_t present : 1;
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105 uint64_t rw : 1;
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106 uint64_t us : 1; // user or supervisor
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107 uint64_t pwt : 1; // page level write-through
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108 uint64_t pcd : 1; // page cache disable
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109 uint64_t accessed : 1;
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110 uint64_t ignored : 1;
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111 uint64_t ps : 1; // page size, must be 0, otherwise maps a 1 GB page.
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112 uint64_t ignored2 : 4;
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113 // 12 bits so far
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114 uint64_t address : 40; // address of page directory table.
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115 uint64_t ignored3 : 11;
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116 uint64_t xd : 1; // execute disable
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117 } PDPTE_t; // Page directory pointer table entry, 64 bits wide. 4-kB aligned.
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118
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119 // Page directory pointer table:
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120 typedef struct
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121 {
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122 PDPTE_t table[512];
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123 uint64_t physicalAddress;
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124 } PDPT_t;
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125
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126 typedef struct
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127 {
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128 uint64_t present : 1;
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129 uint64_t rw : 1;
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130 uint64_t us : 1; // user or supervisor
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131 uint64_t pwt : 1;
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132 uint64_t pcd : 1; // page cache disable
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133 uint64_t accessed : 1;
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134 uint64_t ignored : 1;
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135 uint64_t ps : 1; // page size, must be 0, otherwise maps a 2-MB page.
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136 uint64_t ignored2 : 4;
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137 // 12 bits so far
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138 uint64_t address : 40; // address of page table.
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139 uint64_t ignored3 : 11;
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140 uint64_t xd : 1; // execute disable
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141 } PDE_t;
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142
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143 // Page directory:
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144 typedef struct
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145 {
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146 PDE_t table[512];
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147 uint64_t physicalAddress;
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148 } PD_t;
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149
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150 typedef struct
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151 {
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152 unsigned present : 1;
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153 uint64_t rw : 1;
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154 uint64_t us : 1; // user or supervisor
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155 uint64_t pwt : 1;
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156 uint64_t pcd : 1; // page cache disable
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157 uint64_t accessed : 1;
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158 uint64_t dirty : 1;
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159 uint64_t pat : 1; // memory type?
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160 uint64_t g : 1; // Global?
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161 uint64_t ignored : 3;
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162
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163 uint64_t address : 40;
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164 uint64_t ignored2 : 11;
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165 uint64_t xd : 1;
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166 } page_t;
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167
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168 _Static_assert(sizeof(page_t) == 8, "sizeof(page_t) != 8");
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169 _Static_assert(sizeof(PDE_t) == 8, "sizeof(PDE_t) != 8");
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170 _Static_assert(sizeof(PDPTE_t) == 8, "sizeof(PDPTE_t) != 8");
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171 _Static_assert(sizeof(PML4E_t) == 8, "sizeof(PML4E_t) != 8");
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172
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173 // Page table:
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174 typedef struct
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175 {
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176 page_t table[512];
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177 uint64_t physicalAddress;
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178 } PT_t;
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179
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180 // Make memmap a PML4 type:
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181 typedef PML4_t memmap_t;
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182
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183 // Malloc related functions
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184 typedef struct {
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185 uint64_t magic;
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186 uint64_t state;
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187 uint64_t size;
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188 } heap_header_t;
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189
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190 typedef struct
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191 {
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192 heap_header_t *first_block;
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193 uint64_t start_address;
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194 uint64_t end_address;
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195 } heap_t;
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196
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197 // Task related types:
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198 typedef struct
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199 {
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200 char name[32]; // Name of the console
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201 unsigned char screendata[80*25]; // All chars in the console!
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202 } console_t;
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203
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204 typedef struct task_t {
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205 struct task_t* next;
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206 uint32_t kstack;
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207 uint32_t ustack;
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208
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209 // For task switching:
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210 uint64_t cr3;
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211 uint64_t rip;
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212 uint64_t rsp;
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213 uint64_t rbp;
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214
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215 uint32_t pid;
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216 uint32_t parent;
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217 uint32_t owner;
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218 uint32_t groups;
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219 uint32_t timetorun;
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220 uint32_t sleep;
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221 uint32_t priority;
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222 uint32_t filehandle;
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223 char naam[32];
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224
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225 console_t *console;
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226 } task_t;
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227
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228 /* Filesystem related types: */
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229 struct fs_node_tag;
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230 struct fs_dirent_tag;
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231
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232 typedef uint64_t (*read_type_t)(struct fs_node_tag*, uint64_t, uint64_t, uint8_t*);
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233 typedef uint64_t (*write_type_t)(struct fs_node_tag*, uint64_t, uint64_t, uint8_t*);
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234 typedef void (*open_type_t)(struct fs_node_tag*);
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235 typedef void (*close_type_t)(struct fs_node_tag*);
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236 typedef struct fs_dirent_tag* (*readdir_type_t)(struct fs_node_tag*, int);
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237
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238 typedef struct fs_node_tag
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239 {
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240 char name[129];
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241 uint64_t flags;
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242 uint64_t length;
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243 uint64_t inode;
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244 // Accessor functions:
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245 read_type_t read;
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246 write_type_t write;
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247 open_type_t open;
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248 close_type_t close;
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249 readdir_type_t readdir;
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250 } fs_node_t;
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251
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252 typedef struct fs_dirent_tag
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253 {
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254 char name[65];
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255 uint64_t inode;
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256 } fs_dirent_t;
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257
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258 #define FS_FILE 0x1
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259 #define FS_DIRECTORY 0x2
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260
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261 uint64_t read_fs(fs_node_t *node, uint64_t offset, uint64_t size, uint8_t *buffer);
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262 uint64_t write_fs(fs_node_t *node, uint64_t offset, uint64_t size, uint8_t *buffer);
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263 void open_fs(fs_node_t *node);
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264 void close_fs(fs_node_t *node);
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265 fs_dirent_t* readdir_fs(fs_node_t *node, int i);
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266
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267 // Initial ramdisk functions:
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268 fs_node_t* initialize_initrd(uint64_t location);
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269
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270 void load_ramdisk(void);
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271
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272 // Variable argument list things:
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273 #define va_start(v,l) __builtin_va_start(v,l)
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274 #define va_end(v) __builtin_va_end(v)
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275 #define va_arg(v,l) __builtin_va_arg(v,l)
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276 typedef __builtin_va_list va_list;
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277
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278 /* Global variables */
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279 extern uint64_t kernel_end;
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280 extern uint64_t placement_address;
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281 extern memmap_t* kernel_map;
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282
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283 /* Procedures */
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284
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285 // memory functions:
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286 // TODO: remove some redundant API functions:
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287 void init_memory(uint64_t total_mem_size);
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288 page_t* get_page(uint64_t address, memmap_t*);
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289 void alloc_frame(page_t *page);
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290 void loadPageTable(void* tableAddress);
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291 void switch_mapping(memmap_t* mapping);
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292 void enablePaging();
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293
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294 // Malloc related:
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295 void* kmalloc(uint64_t size);
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296 void* kmalloc_a(uint64_t size); // Aligned on a 4 KiB page.
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297 void kfree(void* ptr);
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298 heap_t* create_heap(uint64_t location, uint64_t size);
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299
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300 // task related functions:
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301 void initialize_tasking();
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302 void new_task();
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303 void task_scheduler();
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304
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305 // STDout funcs:
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306 void printf(const char* fmt, ... );
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307 void memset(void* ptr, uint8_t value, uint64_t num);
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308 void memcpy(void* dst, void* src, uint64_t num);
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309 int strncmp(const char* s1, const char* s2, int size);
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310
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311 // Screen related:
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312 void clear_screen();
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313 void init_screen();
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314 void print_string(const char *);
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315 void set_cursor(int newrow, int newcol);
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316 void get_cursor(int *therow, int *thecol);
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317 void set_color(int forecolor, int backcolor);
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318
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319 // For IO ports:
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320 uint8_t inb(uint16_t);
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321 uint16_t inw(uint16_t);
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322 void outb(uint16_t, uint8_t);
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323
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324 // Interrupt functions:
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325 void setupIDT(void);
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326 void PICremap(void);
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327 void loadIDT(void);
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328
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329 // ASM helper:
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330 uint64_t read_rip();
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331
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332 // Helpers:
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333 void halt(void);
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334 void panic(char *msg);
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335 void reboot(void);
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336 void magicBochsBreak();
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337 void doCPUID(int eax, int *ebx, int *ecx, int *edx);
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338
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339 // Keyboard driver:
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340 void keyboardDriverUpdate(void);
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341 void getline(char *buffer, int len);
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342 void keyboard_init(void);
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343
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344 // Timer:
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345 void timerDriverUpdate(void);
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346 uint64_t getTimeMS();
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347 void timer_init(void);
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348
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349 // Multiboot:
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350 extern uint64_t available_memory;
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351 extern uint64_t ramdisk_location;
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352 void read_multiboot_info(void);
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353
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354 // Shell
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355 void shell(void);
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356
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357 #endif
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358