LXR linux/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
  63struct 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
  93struct revectored_struct {
  94        unsigned long __map[8];                 /* 256 bits */
  95};
  96
  97struct 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
 111struct 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};
 119struct 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 */
 131