libhd
5.0
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00001 #ifndef _LINUX_VM86_H 00002 #define _LINUX_VM86_H 00003 00004 /* 00005 * I'm guessing at the VIF/VIP flag usage, but hope that this is how 00006 * the Pentium uses them. Linux will return from vm86 mode when both 00007 * VIF and VIP is set. 00008 * 00009 * On a Pentium, we could probably optimize the virtual flags directly 00010 * in the eflags register instead of doing it "by hand" in vflags... 00011 * 00012 * Linus 00013 */ 00014 00015 #define TF_MASK 0x00000100 00016 #define IF_MASK 0x00000200 00017 #define IOPL_MASK 0x00003000 00018 #define NT_MASK 0x00004000 00019 #define VM_MASK 0x00020000 00020 #define AC_MASK 0x00040000 00021 #define VIF_MASK 0x00080000 /* virtual interrupt flag */ 00022 #define VIP_MASK 0x00100000 /* virtual interrupt pending */ 00023 #define ID_MASK 0x00200000 00024 00025 #define BIOSSEG 0x0f000 00026 00027 #define CPU_086 0 00028 #define CPU_186 1 00029 #define CPU_286 2 00030 #define CPU_386 3 00031 #define CPU_486 4 00032 #define CPU_586 5 00033 00034 /* 00035 * Return values for the 'vm86()' system call 00036 */ 00037 #define VM86_TYPE(retval) ((retval) & 0xff) 00038 #define VM86_ARG(retval) ((retval) >> 8) 00039 00040 #define VM86_SIGNAL 0 /* return due to signal */ 00041 #define VM86_UNKNOWN 1 /* unhandled GP fault - IO-instruction or similar */ 00042 #define VM86_INTx 2 /* int3/int x instruction (ARG = x) */ 00043 #define VM86_STI 3 /* sti/popf/iret instruction enabled virtual interrupts */ 00044 00045 /* 00046 * Additional return values when invoking new vm86() 00047 */ 00048 #define VM86_PICRETURN 4 /* return due to pending PIC request */ 00049 #define VM86_TRAP 6 /* return due to DOS-debugger request */ 00050 00051 /* 00052 * function codes when invoking new vm86() 00053 */ 00054 #define VM86_PLUS_INSTALL_CHECK 0 00055 #define VM86_ENTER 1 00056 #define VM86_ENTER_NO_BYPASS 2 00057 #define VM86_REQUEST_IRQ 3 00058 #define VM86_FREE_IRQ 4 00059 #define VM86_GET_IRQ_BITS 5 00060 #define VM86_GET_AND_RESET_IRQ 6 00061 00062 /* 00063 * This is the stack-layout seen by the user space program when we have 00064 * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout 00065 * is 'kernel_vm86_regs' (see below). 00066 */ 00067 00068 struct vm86_regs { 00069 /* 00070 * normal regs, with special meaning for the segment descriptors.. 00071 */ 00072 long ebx; 00073 long ecx; 00074 long edx; 00075 long esi; 00076 long edi; 00077 long ebp; 00078 long eax; 00079 long __null_ds; 00080 long __null_es; 00081 long __null_fs; 00082 long __null_gs; 00083 long orig_eax; 00084 long eip; 00085 unsigned short cs, __csh; 00086 long eflags; 00087 long esp; 00088 unsigned short ss, __ssh; 00089 /* 00090 * these are specific to v86 mode: 00091 */ 00092 unsigned short es, __esh; 00093 unsigned short ds, __dsh; 00094 unsigned short fs, __fsh; 00095 unsigned short gs, __gsh; 00096 }; 00097 00098 struct revectored_struct { 00099 unsigned long __map[8]; /* 256 bits */ 00100 }; 00101 00102 struct vm86_struct { 00103 struct vm86_regs regs; 00104 unsigned long flags; 00105 unsigned long screen_bitmap; 00106 unsigned long cpu_type; 00107 struct revectored_struct int_revectored; 00108 struct revectored_struct int21_revectored; 00109 }; 00110 00111 /* 00112 * flags masks 00113 */ 00114 #define VM86_SCREEN_BITMAP 0x0001 00115 00116 struct vm86plus_info_struct { 00117 unsigned long force_return_for_pic:1; 00118 unsigned long vm86dbg_active:1; /* for debugger */ 00119 unsigned long vm86dbg_TFpendig:1; /* for debugger */ 00120 unsigned long unused:28; 00121 unsigned long is_vm86pus:1; /* for vm86 internal use */ 00122 unsigned char vm86dbg_intxxtab[32]; /* for debugger */ 00123 }; 00124 00125 struct vm86plus_struct { 00126 struct vm86_regs regs; 00127 unsigned long flags; 00128 unsigned long screen_bitmap; 00129 unsigned long cpu_type; 00130 struct revectored_struct int_revectored; 00131 struct revectored_struct int21_revectored; 00132 struct vm86plus_info_struct vm86plus; 00133 }; 00134 00135 #endif