arch/x86/include/uapi/asm/vm86.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _UAPI_ASM_X86_VM86_H
   3 #define _UAPI_ASM_X86_VM86_H
   4
   5 /*
   6  * I'm guessing at the VIF/VIP flag usage, but hope that this is how
   7  * the Pentium uses them. Linux will return from vm86 mode when both
   8  * VIF and VIP is set.
   9  *
  10  * On a Pentium, we could probably optimize the virtual flags directly
  11  * in the eflags register instead of doing it "by hand" in vflags...
  12  *
  13  * Linus
  14  */
  15
  16 #include <asm/processor-flags.h>
  17
  18 #define BIOSSEG         0x0f000
  19
  20 #define CPU_086         0
  21 #define CPU_186         1
  22 #define CPU_286         2
  23 #define CPU_386         3
  24 #define CPU_486         4
  25 #define CPU_586         5
  26
  27 /*
  28  * Return values for the 'vm86()' system call
  29  */
  30 #define VM86_TYPE(retval)       ((retval) & 0xff)
  31 #define VM86_ARG(retval)        ((retval) >> 8)
  32
  33 #define VM86_SIGNAL     0       /* return due to signal */
  34 #define VM86_UNKNOWN    1       /* unhandled GP fault
  35                                    - IO-instruction or similar */
  36 #define VM86_INTx       2       /* int3/int x instruction (ARG = x) */
  37 #define VM86_STI        3       /* sti/popf/iret instruction enabled
  38                                    virtual interrupts */
  39
  40 /*
  41  * Additional return values when invoking new vm86()
  42  */
  43 #define VM86_PICRETURN  4       /* return due to pending PIC request */
  44 #define VM86_TRAP       6       /* return due to DOS-debugger request */
  45
  46 /*
  47  * function codes when invoking new vm86()
  48  */
  49 #define VM86_PLUS_INSTALL_CHECK 0
  50 #define VM86_ENTER              1
  51 #define VM86_ENTER_NO_BYPASS    2
  52 #define VM86_REQUEST_IRQ        3
  53 #define VM86_FREE_IRQ           4
  54 #define VM86_GET_IRQ_BITS       5
  55 #define VM86_GET_AND_RESET_IRQ  6
  56
  57 /*
  58  * This is the stack-layout seen by the user space program when we have
  59  * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
  60  * is 'kernel_vm86_regs' (see below).
  61  */
  62
  63 struct vm86_regs {
  64 /*
  65  * normal regs, with special meaning for the segment descriptors..
  66  */
  67         long ebx;
  68         long ecx;
  69         long edx;
  70         long esi;
  71         long edi;
  72         long ebp;
  73         long eax;
  74         long __null_ds;
  75         long __null_es;
  76         long __null_fs;
  77         long __null_gs;
  78         long orig_eax;
  79         long eip;
  80         unsigned short cs, __csh;
  81         long eflags;
  82         long esp;
  83         unsigned short ss, __ssh;
  84 /*
  85  * these are specific to v86 mode:
  86  */
  87         unsigned short es, __esh;
  88         unsigned short ds, __dsh;
  89         unsigned short fs, __fsh;
  90         unsigned short gs, __gsh;
  91 };
  92
  93 struct revectored_struct {
  94         unsigned long __map[8];                 /* 256 bits */
  95 };
  96
  97 struct vm86_struct {
  98         struct vm86_regs regs;
  99         unsigned long flags;
 100         unsigned long screen_bitmap;            /* unused, preserved by vm86() */
 101         unsigned long cpu_type;
 102         struct revectored_struct int_revectored;
 103         struct revectored_struct int21_revectored;
 104 };
 105
 106 /*
 107  * flags masks
 108  */
 109 #define VM86_SCREEN_BITMAP      0x0001        /* no longer supported */
 110
 111 struct vm86plus_info_struct {
 112         unsigned long force_return_for_pic:1;
 113         unsigned long vm86dbg_active:1;       /* for debugger */
 114         unsigned long vm86dbg_TFpendig:1;     /* for debugger */
 115         unsigned long unused:28;
 116         unsigned long is_vm86pus:1;           /* for vm86 internal use */
 117         unsigned char vm86dbg_intxxtab[32];   /* for debugger */
 118 };
 119 struct vm86plus_struct {
 120         struct vm86_regs regs;
 121         unsigned long flags;
 122         unsigned long screen_bitmap;
 123         unsigned long cpu_type;
 124         struct revectored_struct int_revectored;
 125         struct revectored_struct int21_revectored;
 126         struct vm86plus_info_struct vm86plus;
 127 };
 128
 129
 130 #endif /* _UAPI_ASM_X86_VM86_H */