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42 | pj | 1 | /* Project: OSLib |
2 | * Description: The OS Construction Kit |
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3 | * Date: 1.6.2000 |
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4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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5 | * |
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6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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7 | * low-level infrastructure for developing OS kernels and Embedded |
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8 | * Applications; it partially derives from the HARTIK project but it |
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9 | * currently is independently developed. |
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10 | * |
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11 | * OSLib is distributed under GPL License, and some of its code has |
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12 | * been derived from the Linux kernel source; also some important |
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13 | * ideas come from studying the DJGPP go32 extender. |
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14 | * |
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15 | * We acknowledge the Linux Community, Free Software Foundation, |
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16 | * D.J. Delorie and all the other developers who believe in the |
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17 | * freedom of software and ideas. |
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18 | * |
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19 | * For legalese, check out the included GPL license. |
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20 | */ |
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21 | |||
22 | /* As the name says... All the hardware-dependent data structures... */ |
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23 | |||
24 | #ifndef __LL_I386_HW_DATA_H__ |
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25 | #define __LL_I386_HW_DATA_H__ |
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26 | |||
27 | #include <ll/i386/defs.h> |
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28 | BEGIN_DEF |
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29 | |||
30 | /* DO WE NEED A SEPARATE INCL FILE FOR THIS? */ |
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31 | #if defined(__GNU__) |
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32 | #define __LL_ARCH__ "32/DJGPP C/COFF" |
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33 | #elif defined(__LINUX__) |
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34 | #define __LL_ARCH__ "32/LINUX CrossCompiled/ELF" |
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35 | #else |
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36 | #error Architecture Undefined! |
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37 | #endif |
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38 | |||
39 | #include <ll/i386/sel.h> |
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40 | |||
41 | /* Useful basic types */ |
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42 | |||
43 | #ifndef __BASIC_DATA__ |
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44 | #define __BASIC_DATA__ |
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45 | typedef void *LIN_ADDR; |
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46 | typedef unsigned long long QWORD; |
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47 | typedef unsigned long DWORD; |
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48 | typedef unsigned short WORD; |
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49 | typedef unsigned char BYTE; |
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50 | typedef unsigned long TIME; |
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51 | typedef unsigned long SYS_FLAGS; |
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52 | #define TRUE 1 |
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53 | #define FALSE 0 |
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54 | #define MAX_DWORD 0xFFFFFFFF |
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55 | #define MAX_WORD 0xFFFF |
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56 | #define MAX_BYTE 0xFF |
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57 | #define MAX_TIME MAX_DWORD |
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58 | #endif |
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59 | |||
60 | typedef short CONTEXT; |
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61 | |||
62 | /* Hardware based types (Self explanatory) */ |
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63 | |||
64 | typedef struct gate { |
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65 | WORD offset_lo __attribute__ ((packed)); |
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66 | WORD sel __attribute__ ((packed)); |
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67 | BYTE dword_cnt __attribute__ ((packed)); |
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68 | BYTE access __attribute__ ((packed)); |
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69 | WORD offset_hi __attribute__ ((packed)); |
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70 | } GATE; |
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71 | |||
72 | typedef struct descriptor { |
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73 | WORD lim_lo __attribute__ ((packed)); |
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74 | WORD base_lo __attribute__ ((packed)); |
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75 | BYTE base_med __attribute__ ((packed)); |
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76 | BYTE access __attribute__ ((packed)); |
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77 | BYTE gran __attribute__ ((packed)); |
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78 | BYTE base_hi __attribute__ ((packed)); |
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79 | } DESCRIPTOR; |
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80 | |||
81 | /* A LDT/GDT entry could be a gate or a selector */ |
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82 | /* An IDT entry could be a gate only */ |
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83 | |||
84 | union gdt_entry { |
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85 | DESCRIPTOR d __attribute__ ((packed)); |
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86 | GATE g __attribute__ ((packed)); |
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87 | }; |
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88 | |||
89 | struct registers { |
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90 | DWORD dummy1; |
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91 | DWORD dummy2; |
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92 | DWORD egs; |
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93 | DWORD efs; |
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94 | DWORD ees; |
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95 | DWORD ess; |
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96 | DWORD eds; |
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97 | DWORD edi; |
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98 | DWORD esi; |
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99 | DWORD ebp; |
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100 | DWORD esp; |
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101 | DWORD ebx; |
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102 | DWORD edx; |
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103 | DWORD ecx; |
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104 | DWORD eax; |
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105 | DWORD eip; |
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106 | DWORD ecs; |
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107 | DWORD flags; |
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108 | }; |
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109 | |||
110 | #define STACK_ACCESS 0x92 /* Basic Access bytes */ |
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111 | #define DATA_ACCESS 0x92 |
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112 | #define CODE_ACCESS 0x9A |
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113 | |||
114 | /* At this level we just need to set up 2 gates to enter/exit PM */ |
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115 | /* The entry gate is a 386 32 bit call gate */ |
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116 | /* The exit (Back To Real Mode) gate is a 286 16 bit gate */ |
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117 | |||
118 | #define CALL_GATE286 0x84 /* Call & Int Gate Access bytes */ |
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119 | #define CALL_GATE386 0x8C |
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120 | #define TASK_GATE 0x85 |
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121 | #define INT_GATE286 0x86 |
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122 | #define INT_GATE386 0x8E |
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123 | #define TRAP_GATE286 0x87 |
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124 | #define TRAP_GATE386 0x8F |
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125 | |||
126 | /* TSS selectors */ |
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127 | |||
128 | #define FREE_TSS386 0x89 |
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129 | #define BUSY_TSS386 0x8B |
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130 | #define FREE_TSS286 0x81 |
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131 | #define BUSY_TSS286 0x83 |
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132 | |||
133 | #define GRAN_32B 0xC0 /* Granularity settings */ |
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134 | #define GRAN_32 0x40 |
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135 | #define GRAN_16 0x00 |
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136 | |||
137 | /* This is the TSS image for a 386 hardware task */ |
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138 | /* I added two other fields to the basic structure: */ |
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139 | /* 1) The CONTROL field which is used by system software to detect */ |
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140 | /* particular conditions; in this the first phase it is mainly used */ |
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141 | /* to mark the unused TSS & TSS which use math, altough thanks to */ |
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142 | /* the automatic FPU preemption supported in 386 this would be not */ |
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143 | /* necessary. */ |
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144 | /* 2) The ctx_FPU field used to store the FPU context if necessaary */ |
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145 | |||
146 | #define TSS_USED 0x8000 |
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147 | #define FPU_USED 0x4000 |
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148 | |||
149 | #define FPU_CONTEXT_SIZE 108 |
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150 | |||
151 | /* CPU flags definitions */ |
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152 | #define CPU_FLAG_TF 0x00000100 |
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153 | #define CPU_FLAG_IF 0x00000200 |
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154 | #define CPU_FLAG_IOPL 0x00003000 |
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155 | #define CPU_FLAG_NT 0x00004000 |
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156 | #define CPU_FLAG_VM 0x00020000 |
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157 | #define CPU_FLAG_AC 0x00040000 |
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158 | #define CPU_FLAG_VIF 0x00080000 |
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159 | #define CPU_FLAG_VIP 0x00100000 |
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160 | #define CPU_FLAG_ID 0x00200000 |
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161 | |||
162 | |||
163 | typedef struct tss { |
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164 | WORD back_link __attribute__ ((packed)); |
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165 | WORD _fill0 __attribute__ ((packed)); |
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166 | DWORD esp0 __attribute__ ((packed)); |
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167 | WORD ss0 __attribute__ ((packed)); |
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168 | WORD _fill1 __attribute__ ((packed)); |
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169 | DWORD esp1 __attribute__ ((packed)); |
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170 | WORD ss1 __attribute__ ((packed)); |
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171 | WORD _fill2 __attribute__ ((packed)); |
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172 | DWORD esp2 __attribute__ ((packed)); |
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173 | WORD ss2 __attribute__ ((packed)); |
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174 | WORD _fill3 __attribute__ ((packed)); |
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175 | DWORD cr3 __attribute__ ((packed)); |
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176 | DWORD eip __attribute__ ((packed)); |
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177 | DWORD eflags __attribute__ ((packed)); |
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178 | DWORD eax __attribute__ ((packed)); |
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179 | DWORD ecx __attribute__ ((packed)); |
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180 | DWORD edx __attribute__ ((packed)); |
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181 | DWORD ebx __attribute__ ((packed)); |
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182 | DWORD esp __attribute__ ((packed)); |
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183 | DWORD ebp __attribute__ ((packed)); |
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184 | DWORD esi __attribute__ ((packed)); |
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185 | DWORD edi __attribute__ ((packed)); |
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186 | WORD es __attribute__ ((packed)); |
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187 | WORD _fill5 __attribute__ ((packed)); |
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188 | WORD cs __attribute__ ((packed)); |
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189 | WORD _fill6 __attribute__ ((packed)); |
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190 | WORD ss __attribute__ ((packed)); |
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191 | WORD _fill7 __attribute__ ((packed)); |
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192 | WORD ds __attribute__ ((packed)); |
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193 | WORD _fill8 __attribute__ ((packed)); |
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194 | WORD fs __attribute__ ((packed)); |
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195 | WORD _fill9 __attribute__ ((packed)); |
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196 | WORD gs __attribute__ ((packed)); |
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197 | WORD _fill10 __attribute__ ((packed)); |
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198 | WORD ldt __attribute__ ((packed)); |
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199 | WORD _fill11 __attribute__ ((packed)); |
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200 | WORD trap __attribute__ ((packed)); |
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201 | WORD io_base __attribute__ ((packed)); |
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202 | DWORD control __attribute__ ((packed)); |
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203 | BYTE ctx_FPU[FPU_CONTEXT_SIZE] __attribute__ ((packed)); |
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204 | } TSS; |
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205 | |||
206 | /* Irq services specifications */ |
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207 | |||
208 | #define TIMER_IRQ 0 |
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209 | #define KEYB_IRQ 1 |
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210 | #define COM2_IRQ 3 |
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211 | #define COM1_IRQ 4 |
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212 | #define COM4_IRQ 3 |
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213 | #define COM3_IRQ 4 |
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214 | #define SB_IRQ 5 |
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215 | #define FDC_IRQ 6 |
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216 | #define SB2_IRQ 7 |
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217 | #define RTC_IRQ 8 |
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218 | #define PS2MOUSE_IRQ 12 |
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219 | #define COPROC_IRQ 13 |
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220 | #define IDE0_IRQ 14 |
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221 | #define IDE1_IRQ 15 |
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222 | |||
223 | typedef void (*INTERRUPT)(void); |
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224 | |||
225 | /* Any Kernel primitive is declared with the SYSCALL() modifier */ |
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226 | /* This is useful to add special purposes meaning to the function */ |
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227 | /* defclaration */ |
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228 | |||
229 | #define SYSCALL(x) x |
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230 | |||
231 | END_DEF |
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232 | |||
233 | #endif |