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422 | giacomo | 1 | #ifndef _LINUX_VM86_H |
2 | #define _LINUX_VM86_H |
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3 | |||
4 | /* |
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5 | * I'm guessing at the VIF/VIP flag usage, but hope that this is how |
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6 | * the Pentium uses them. Linux will return from vm86 mode when both |
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7 | * VIF and VIP is set. |
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8 | * |
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9 | * On a Pentium, we could probably optimize the virtual flags directly |
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10 | * in the eflags register instead of doing it "by hand" in vflags... |
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11 | * |
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12 | * Linus |
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13 | */ |
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14 | |||
15 | #define TF_MASK 0x00000100 |
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16 | #define IF_MASK 0x00000200 |
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17 | #define IOPL_MASK 0x00003000 |
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18 | #define NT_MASK 0x00004000 |
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19 | #define VM_MASK 0x00020000 |
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20 | #define AC_MASK 0x00040000 |
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21 | #define VIF_MASK 0x00080000 /* virtual interrupt flag */ |
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22 | #define VIP_MASK 0x00100000 /* virtual interrupt pending */ |
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23 | #define ID_MASK 0x00200000 |
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24 | |||
25 | #define BIOSSEG 0x0f000 |
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26 | |||
27 | #define CPU_086 0 |
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28 | #define CPU_186 1 |
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29 | #define CPU_286 2 |
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30 | #define CPU_386 3 |
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31 | #define CPU_486 4 |
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32 | #define CPU_586 5 |
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33 | |||
34 | /* |
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35 | * Return values for the 'vm86()' system call |
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36 | */ |
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37 | #define VM86_TYPE(retval) ((retval) & 0xff) |
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38 | #define VM86_ARG(retval) ((retval) >> 8) |
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39 | |||
40 | #define VM86_SIGNAL 0 /* return due to signal */ |
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41 | #define VM86_UNKNOWN 1 /* unhandled GP fault - IO-instruction or similar */ |
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42 | #define VM86_INTx 2 /* int3/int x instruction (ARG = x) */ |
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43 | #define VM86_STI 3 /* sti/popf/iret instruction enabled virtual interrupts */ |
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44 | |||
45 | /* |
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46 | * Additional return values when invoking new vm86() |
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47 | */ |
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48 | #define VM86_PICRETURN 4 /* return due to pending PIC request */ |
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49 | #define VM86_TRAP 6 /* return due to DOS-debugger request */ |
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50 | |||
51 | /* |
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52 | * function codes when invoking new vm86() |
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53 | */ |
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54 | #define VM86_PLUS_INSTALL_CHECK 0 |
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55 | #define VM86_ENTER 1 |
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56 | #define VM86_ENTER_NO_BYPASS 2 |
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57 | #define VM86_REQUEST_IRQ 3 |
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58 | #define VM86_FREE_IRQ 4 |
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59 | #define VM86_GET_IRQ_BITS 5 |
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60 | #define VM86_GET_AND_RESET_IRQ 6 |
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61 | |||
62 | /* |
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63 | * This is the stack-layout seen by the user space program when we have |
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64 | * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout |
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65 | * is 'kernel_vm86_regs' (see below). |
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66 | */ |
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67 | |||
68 | struct vm86_regs { |
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69 | /* |
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70 | * normal regs, with special meaning for the segment descriptors.. |
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71 | */ |
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72 | long ebx; |
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73 | long ecx; |
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74 | long edx; |
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75 | long esi; |
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76 | long edi; |
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77 | long ebp; |
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78 | long eax; |
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79 | long __null_ds; |
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80 | long __null_es; |
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81 | long __null_fs; |
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82 | long __null_gs; |
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83 | long orig_eax; |
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84 | long eip; |
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85 | unsigned short cs, __csh; |
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86 | long eflags; |
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87 | long esp; |
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88 | unsigned short ss, __ssh; |
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89 | /* |
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90 | * these are specific to v86 mode: |
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91 | */ |
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92 | unsigned short es, __esh; |
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93 | unsigned short ds, __dsh; |
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94 | unsigned short fs, __fsh; |
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95 | unsigned short gs, __gsh; |
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96 | }; |
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97 | |||
98 | struct revectored_struct { |
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99 | unsigned long __map[8]; /* 256 bits */ |
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100 | }; |
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101 | |||
102 | struct vm86_struct { |
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103 | struct vm86_regs regs; |
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104 | unsigned long flags; |
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105 | unsigned long screen_bitmap; |
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106 | unsigned long cpu_type; |
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107 | struct revectored_struct int_revectored; |
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108 | struct revectored_struct int21_revectored; |
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109 | }; |
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110 | |||
111 | /* |
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112 | * flags masks |
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113 | */ |
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114 | #define VM86_SCREEN_BITMAP 0x0001 |
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115 | |||
116 | struct vm86plus_info_struct { |
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117 | unsigned long force_return_for_pic:1; |
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118 | unsigned long vm86dbg_active:1; /* for debugger */ |
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119 | unsigned long vm86dbg_TFpendig:1; /* for debugger */ |
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120 | unsigned long unused:28; |
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121 | unsigned long is_vm86pus:1; /* for vm86 internal use */ |
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122 | unsigned char vm86dbg_intxxtab[32]; /* for debugger */ |
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123 | }; |
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124 | |||
125 | struct vm86plus_struct { |
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126 | struct vm86_regs regs; |
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127 | unsigned long flags; |
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128 | unsigned long screen_bitmap; |
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129 | unsigned long cpu_type; |
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130 | struct revectored_struct int_revectored; |
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131 | struct revectored_struct int21_revectored; |
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132 | struct vm86plus_info_struct vm86plus; |
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133 | }; |
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134 | |||
135 | #ifdef __KERNEL__ |
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136 | /* |
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137 | * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86 |
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138 | * mode - the main change is that the old segment descriptors aren't |
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139 | * useful any more and are forced to be zero by the kernel (and the |
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140 | * hardware when a trap occurs), and the real segment descriptors are |
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141 | * at the end of the structure. Look at ptrace.h to see the "normal" |
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142 | * setup. For user space layout see 'struct vm86_regs' above. |
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143 | */ |
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144 | |||
145 | struct kernel_vm86_regs { |
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146 | /* |
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147 | * normal regs, with special meaning for the segment descriptors.. |
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148 | */ |
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149 | long ebx; |
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150 | long ecx; |
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151 | long edx; |
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152 | long esi; |
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153 | long edi; |
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154 | long ebp; |
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155 | long eax; |
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156 | long __null_ds; |
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157 | long __null_es; |
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158 | long orig_eax; |
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159 | long eip; |
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160 | unsigned short cs, __csh; |
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161 | long eflags; |
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162 | long esp; |
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163 | unsigned short ss, __ssh; |
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164 | /* |
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165 | * these are specific to v86 mode: |
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166 | */ |
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167 | unsigned short es, __esh; |
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168 | unsigned short ds, __dsh; |
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169 | unsigned short fs, __fsh; |
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170 | unsigned short gs, __gsh; |
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171 | }; |
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172 | |||
173 | struct kernel_vm86_struct { |
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174 | struct kernel_vm86_regs regs; |
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175 | /* |
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176 | * the below part remains on the kernel stack while we are in VM86 mode. |
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177 | * 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we |
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178 | * get forced back from VM86, the CPU and "SAVE_ALL" will restore the above |
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179 | * 'struct kernel_vm86_regs' with the then actual values. |
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180 | * Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct' |
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181 | * in kernelspace, hence we need not reget the data from userspace. |
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182 | */ |
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183 | #define VM86_TSS_ESP0 flags |
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184 | unsigned long flags; |
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185 | unsigned long screen_bitmap; |
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186 | unsigned long cpu_type; |
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187 | struct revectored_struct int_revectored; |
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188 | struct revectored_struct int21_revectored; |
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189 | struct vm86plus_info_struct vm86plus; |
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190 | struct pt_regs *regs32; /* here we save the pointer to the old regs */ |
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191 | /* |
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192 | * The below is not part of the structure, but the stack layout continues |
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193 | * this way. In front of 'return-eip' may be some data, depending on |
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194 | * compilation, so we don't rely on this and save the pointer to 'oldregs' |
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195 | * in 'regs32' above. |
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196 | * However, with GCC-2.7.2 and the current CFLAGS you see exactly this: |
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197 | |||
198 | long return-eip; from call to vm86() |
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199 | struct pt_regs oldregs; user space registers as saved by syscall |
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200 | */ |
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201 | }; |
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202 | |||
203 | void handle_vm86_fault(struct kernel_vm86_regs *, long); |
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204 | int handle_vm86_trap(struct kernel_vm86_regs *, long, int); |
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205 | |||
206 | #endif /* __KERNEL__ */ |
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207 | |||
208 | #endif |