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 */