libhd  5.0
vm86_struct.h
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1 #ifndef _LINUX_VM86_H
2 #define _LINUX_VM86_H
3 
4 /*
5  * I'm guessing at the VIF/VIP flag usage, but hope that this is how
6  * the Pentium uses them. Linux will return from vm86 mode when both
7  * VIF and VIP is set.
8  *
9  * On a Pentium, we could probably optimize the virtual flags directly
10  * in the eflags register instead of doing it "by hand" in vflags...
11  *
12  * Linus
13  */
14 
15 #define TF_MASK 0x00000100
16 #define IF_MASK 0x00000200
17 #define IOPL_MASK 0x00003000
18 #define NT_MASK 0x00004000
19 #define VM_MASK 0x00020000
20 #define AC_MASK 0x00040000
21 #define VIF_MASK 0x00080000 /* virtual interrupt flag */
22 #define VIP_MASK 0x00100000 /* virtual interrupt pending */
23 #define ID_MASK 0x00200000
24 
25 #define BIOSSEG 0x0f000
26 
27 #define CPU_086 0
28 #define CPU_186 1
29 #define CPU_286 2
30 #define CPU_386 3
31 #define CPU_486 4
32 #define CPU_586 5
33 
34 /*
35  * Return values for the 'vm86()' system call
36  */
37 #define VM86_TYPE(retval) ((retval) & 0xff)
38 #define VM86_ARG(retval) ((retval) >> 8)
39 
40 #define VM86_SIGNAL 0 /* return due to signal */
41 #define VM86_UNKNOWN 1 /* unhandled GP fault - IO-instruction or similar */
42 #define VM86_INTx 2 /* int3/int x instruction (ARG = x) */
43 #define VM86_STI 3 /* sti/popf/iret instruction enabled virtual interrupts */
44 
45 /*
46  * Additional return values when invoking new vm86()
47  */
48 #define VM86_PICRETURN 4 /* return due to pending PIC request */
49 #define VM86_TRAP 6 /* return due to DOS-debugger request */
50 
51 /*
52  * function codes when invoking new vm86()
53  */
54 #define VM86_PLUS_INSTALL_CHECK 0
55 #define VM86_ENTER 1
56 #define VM86_ENTER_NO_BYPASS 2
57 #define VM86_REQUEST_IRQ 3
58 #define VM86_FREE_IRQ 4
59 #define VM86_GET_IRQ_BITS 5
60 #define VM86_GET_AND_RESET_IRQ 6
61 
62 /*
63  * This is the stack-layout seen by the user space program when we have
64  * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
65  * is 'kernel_vm86_regs' (see below).
66  */
67 
68 struct vm86_regs {
69 /*
70  * normal regs, with special meaning for the segment descriptors..
71  */
72  long ebx;
73  long ecx;
74  long edx;
75  long esi;
76  long edi;
77  long ebp;
78  long eax;
79  long __null_ds;
80  long __null_es;
81  long __null_fs;
82  long __null_gs;
83  long orig_eax;
84  long eip;
85  unsigned short cs, __csh;
86  long eflags;
87  long esp;
88  unsigned short ss, __ssh;
89 /*
90  * these are specific to v86 mode:
91  */
92  unsigned short es, __esh;
93  unsigned short ds, __dsh;
94  unsigned short fs, __fsh;
95  unsigned short gs, __gsh;
96 };
97 
99  unsigned long __map[8]; /* 256 bits */
100 };
101 
102 struct vm86_struct {
103  struct vm86_regs regs;
104  unsigned long flags;
105  unsigned long screen_bitmap;
106  unsigned long cpu_type;
109 };
110 
111 /*
112  * flags masks
113  */
114 #define VM86_SCREEN_BITMAP 0x0001
115 
117  unsigned long force_return_for_pic:1;
118  unsigned long vm86dbg_active:1; /* for debugger */
119  unsigned long vm86dbg_TFpendig:1; /* for debugger */
120  unsigned long unused:28;
121  unsigned long is_vm86pus:1; /* for vm86 internal use */
122  unsigned char vm86dbg_intxxtab[32]; /* for debugger */
123 };
124 
126  struct vm86_regs regs;
127  unsigned long flags;
128  unsigned long screen_bitmap;
129  unsigned long cpu_type;
133 };
134 
135 #endif