root / prex-0.9.0 / bsp / hal / x86 / include / cpu.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #ifndef _X86_CPU_H
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31 | #define _X86_CPU_H
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32 | |||
33 | #include <sys/cdefs.h> /* for __packed */ |
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34 | |||
35 | /*
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36 | * GDTs
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37 | */
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38 | #define KERNEL_CS 0x10 |
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39 | #define KERNEL_DS 0x18 |
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40 | #define USER_CS 0x20 |
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41 | #define USER_DS 0x28 |
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42 | #define KERNEL_TSS 0x38 |
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43 | |||
44 | #define NGDTS 8 |
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45 | |||
46 | /*
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47 | * IDTs
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48 | */
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49 | #define NIDTS 0x41 |
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50 | #define SYSCALL_INT 0x40 |
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51 | #define INVALID_INT 0xFF |
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52 | |||
53 | /*
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54 | * x86 flags register
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55 | */
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56 | #define EFL_CF 0x00000001 /* Carry */ |
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57 | #define EFL_PF 0x00000004 /* Parity */ |
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58 | #define EFL_AF 0x00000010 /* Carry */ |
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59 | #define EFL_ZF 0x00000040 /* Zero */ |
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60 | #define EFL_SF 0x00000080 /* Sign */ |
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61 | #define EFL_TF 0x00000100 /* Trap */ |
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62 | #define EFL_IF 0x00000200 /* Interrupt enable */ |
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63 | #define EFL_DF 0x00000400 /* Direction */ |
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64 | #define EFL_OF 0x00000800 /* Overflow */ |
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65 | #define EFL_IOPL 0x00003000 /* IO privilege level: */ |
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66 | #define EFL_IOPL_KERN 0x00000000 /* Kernel */ |
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67 | #define EFL_IOPL_USER 0x00003000 /* User */ |
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68 | #define EFL_NT 0x00004000 /* Nested task */ |
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69 | #define EFL_RF 0x00010000 /* Resume without tracing */ |
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70 | #define EFL_VM 0x00020000 /* Virtual 8086 mode */ |
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71 | #define EFL_AC 0x00040000 /* Alignment Check */ |
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72 | |||
73 | /*
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74 | * CR0 register
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75 | */
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76 | #define CR0_PG 0x80000000 /* enable paging */ |
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77 | #define CR0_CD 0x40000000 /* cache disable */ |
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78 | #define CR0_NW 0x20000000 /* no write-through */ |
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79 | #define CR0_AM 0x00040000 /* alignment check mask */ |
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80 | #define CR0_WP 0x00010000 /* write-protect kernel access */ |
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81 | #define CR0_NE 0x00000020 /* handle numeric exceptions */ |
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82 | #define CR0_ET 0x00000010 /* extension type is 80387 coprocessor */ |
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83 | #define CR0_TS 0x00000008 /* task switch */ |
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84 | #define CR0_EM 0x00000004 /* emulate coprocessor */ |
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85 | #define CR0_MP 0x00000002 /* monitor coprocessor */ |
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86 | #define CR0_PE 0x00000001 /* enable protected mode */ |
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87 | |||
88 | #ifndef __ASSEMBLY__
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89 | |||
90 | #include <sys/types.h> |
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91 | #include <context.h> |
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92 | |||
93 | #if defined(__SUNPRO_C)
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94 | #pragma pack(1) |
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95 | #endif
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96 | |||
97 | /*
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98 | * Segment Descriptor
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99 | */
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100 | struct seg_desc {
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101 | u_int limit_lo:16; /* segment limit (lsb) */ |
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102 | u_int base_lo:16; /* segment base address (lsb) */ |
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103 | u_int base_mid:8; /* segment base address (middle) */ |
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104 | u_int type:8; /* type */ |
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105 | u_int limit_hi:4; /* segment limit (msb) */ |
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106 | u_int size:4; /* size */ |
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107 | u_int base_hi:8; /* segment base address (msb) */ |
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108 | } __packed; |
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109 | |||
110 | /*
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111 | * Gate Descriptor
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112 | */
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113 | struct gate_desc {
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114 | u_int offset_lo:16; /* gate offset (lsb) */ |
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115 | u_int selector:16; /* gate segment selector */ |
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116 | u_int nr_copy:8; /* stack copy count */ |
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117 | u_int type:8; /* type */ |
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118 | u_int offset_hi:16; /* gate offset (msb) */ |
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119 | } __packed; |
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120 | |||
121 | /*
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122 | * Linear memory description for lgdt and lidt instructions.
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123 | */
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124 | struct desc_p {
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125 | uint16_t limit; |
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126 | uint32_t base; |
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127 | } __packed; |
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128 | |||
129 | /*
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130 | * Segment size
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131 | */
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132 | #define SIZE_32 0x4 /* 32-bit segment */ |
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133 | #define SIZE_16 0x0 /* 16-bit segment */ |
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134 | #define SIZE_4K 0x8 /* 4K limit field */ |
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135 | |||
136 | /*
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137 | * Segment type
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138 | */
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139 | #define ST_ACC 0x01 /* accessed */ |
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140 | #define ST_LDT 0x02 /* LDT */ |
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141 | #define ST_CALL_GATE_16 0x04 /* 16-bit call gate */ |
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142 | #define ST_TASK_GATE 0x05 /* task gate */ |
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143 | #define ST_TSS 0x09 /* task segment */ |
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144 | #define ST_CALL_GATE 0x0c /* call gate */ |
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145 | #define ST_INTR_GATE 0x0e /* interrupt gate */ |
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146 | #define ST_TRAP_GATE 0x0f /* trap gate */ |
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147 | |||
148 | #define ST_TSS_BUSY 0x02 /* task busy */ |
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149 | |||
150 | #define ST_DATA 0x10 /* data */ |
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151 | #define ST_DATA_W 0x12 /* data, writable */ |
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152 | #define ST_DATA_E 0x14 /* data, expand-down */ |
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153 | #define ST_DATA_EW 0x16 /* data, expand-down, writable */ |
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154 | |||
155 | #define ST_CODE 0x18 /* code */ |
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156 | #define ST_CODE_R 0x1a /* code, readable */ |
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157 | #define ST_CODE_C 0x1c /* code, conforming */ |
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158 | #define ST_CODE_CR 0x1e /* code, conforming, readable */ |
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159 | |||
160 | #define ST_KERN 0x00 /* kernel access only */ |
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161 | #define ST_USER 0x60 /* user access */ |
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162 | |||
163 | #define ST_PRESENT 0x80 /* segment present */ |
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164 | |||
165 | /*
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166 | * Task State Segment (TSS)
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167 | */
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168 | |||
169 | #define IO_BITMAP_SIZE (65536/8 + 1) |
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170 | #define INVALID_IO_BITMAP 0x8000 |
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171 | |||
172 | struct tss {
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173 | uint32_t back_link; |
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174 | uint32_t esp0, ss0; |
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175 | uint32_t esp1, ss1; |
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176 | uint32_t esp2, ss2; |
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177 | uint32_t cr3; |
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178 | uint32_t eip; |
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179 | uint32_t eflags; |
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180 | uint32_t eax, ecx, edx, ebx; |
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181 | uint32_t esp, ebp, esi, edi; |
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182 | uint32_t es, cs, ss, ds, fs, gs; |
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183 | uint32_t ldt; |
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184 | uint16_t dbg_trace; |
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185 | uint16_t io_bitmap_offset; |
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186 | #if 0
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187 | uint32_t io_bitmap[IO_BITMAP_SIZE/4+1];
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188 | uint32_t pad[5];
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189 | #endif
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190 | } __packed; |
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191 | |||
192 | |||
193 | #if defined(__SUNPRO_C)
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194 | #pragma pack()
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195 | #endif
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196 | |||
197 | __BEGIN_DECLS |
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198 | void tss_set(uint32_t);
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199 | uint32_t tss_get(void);
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200 | void cpu_init(void); |
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201 | __END_DECLS |
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202 | |||
203 | #endif /* !__ASSEMBLY__ */ |
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204 | #endif /* !_X86_CPU_H */ |