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1.1 root 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 when we have done a "SAVE_ALL" from vm86
64: * mode - the main change is that the old segment descriptors aren't
65: * useful any more and are forced to be zero by the kernel (and the
66: * hardware when a trap occurs), and the real segment descriptors are
67: * at the end of the structure. Look at ptrace.h to see the "normal"
68: * setup.
69: */
70:
71: struct vm86_regs {
72: /*
73: * normal regs, with special meaning for the segment descriptors..
74: */
75: long ebx;
76: long ecx;
77: long edx;
78: long esi;
79: long edi;
80: long ebp;
81: long eax;
82: long __null_ds;
83: long __null_es;
84: long __null_fs;
85: long __null_gs;
86: long orig_eax;
87: long eip;
88: unsigned short cs, __csh;
89: long eflags;
90: long esp;
91: unsigned short ss, __ssh;
92: /*
93: * these are specific to v86 mode:
94: */
95: unsigned short es, __esh;
96: unsigned short ds, __dsh;
97: unsigned short fs, __fsh;
98: unsigned short gs, __gsh;
99: };
100:
101: struct revectored_struct {
102: unsigned long __map[8]; /* 256 bits */
103: };
104:
105: struct vm86_struct {
106: struct vm86_regs regs;
107: unsigned long flags;
108: unsigned long screen_bitmap;
109: unsigned long cpu_type;
110: struct revectored_struct int_revectored;
111: struct revectored_struct int21_revectored;
112: };
113:
114: /*
115: * flags masks
116: */
117: #define VM86_SCREEN_BITMAP 0x0001
118:
119: struct vm86plus_info_struct {
120: unsigned long force_return_for_pic:1;
121: unsigned long vm86dbg_active:1; /* for debugger */
122: unsigned long vm86dbg_TFpendig:1; /* for debugger */
123: unsigned long unused:28;
124: unsigned long is_vm86pus:1; /* for vm86 internal use */
125: unsigned char vm86dbg_intxxtab[32]; /* for debugger */
126: };
127:
128: struct vm86plus_struct {
129: struct vm86_regs regs;
130: unsigned long flags;
131: unsigned long screen_bitmap;
132: unsigned long cpu_type;
133: struct revectored_struct int_revectored;
134: struct revectored_struct int21_revectored;
135: struct vm86plus_info_struct vm86plus;
136: };
137:
138: #ifdef __KERNEL__
139:
140: struct kernel_vm86_struct {
141: struct vm86_regs regs;
142: /*
143: * the below part remains on the kernel stack while we are in VM86 mode.
144: * 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we
145: * get forced back from VM86, the CPU and "SAVE_ALL" will restore the above
146: * 'struct kernel_vm86_regs' with the then actual values.
147: * Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct'
148: * in kernelspace, hence we need not reget the data from userspace.
149: */
150: #define VM86_TSS_ESP0 flags
151: unsigned long flags;
152: unsigned long screen_bitmap;
153: unsigned long cpu_type;
154: struct revectored_struct int_revectored;
155: struct revectored_struct int21_revectored;
156: struct vm86plus_info_struct vm86plus;
157: struct pt_regs *regs32; /* here we save the pointer to the old regs */
158: /*
159: * The below is not part of the structure, but the stack layout continues
160: * this way. In front of 'return-eip' may be some data, depending on
161: * compilation, so we don't rely on this and save the pointer to 'oldregs'
162: * in 'regs32' above.
163: * However, with GCC-2.7.2 and the current CFLAGS you see exactly this:
164:
165: long return-eip; from call to vm86()
166: struct pt_regs oldregs; user space registers as saved by syscall
167: */
168: };
169:
170: void handle_vm86_fault(struct vm86_regs *, long);
171: int handle_vm86_trap(struct vm86_regs *, long, int);
172:
173: #endif /* __KERNEL__ */
174:
175: #endif
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