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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/include/uapi/asm/vm86.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _UAPI_ASM_X86_VM86_H

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#define _UAPI_ASM_X86_VM86_H

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/*

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 * I'm guessing at the VIF/VIP flag usage, but hope that this is how

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 * the Pentium uses them. Linux will return from vm86 mode when both

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 * VIF and VIP is set.

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 *

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 * On a Pentium, we could probably optimize the virtual flags directly

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 * in the eflags register instead of doing it "by hand" in vflags...

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 *

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 * Linus

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 */

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#include <asm/processor-flags.h>

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#define BIOSSEG		0x0f000

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#define CPU_086		0

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#define CPU_186		1

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#define CPU_286		2

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#define CPU_386		3

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#define CPU_486		4

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#define CPU_586		5

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/*

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 * Return values for the 'vm86()' system call

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 */

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#define VM86_TYPE(retval)	((retval) & 0xff)

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#define VM86_ARG(retval)	((retval) >> 8)

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#define VM86_SIGNAL	0	/* return due to signal */

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#define VM86_UNKNOWN	1	/* unhandled GP fault

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				   - IO-instruction or similar */

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#define VM86_INTx	2	/* int3/int x instruction (ARG = x) */

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#define VM86_STI	3	/* sti/popf/iret instruction enabled

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				   virtual interrupts */

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/*

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 * Additional return values when invoking new vm86()

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 */

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#define VM86_PICRETURN	4	/* return due to pending PIC request */

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#define VM86_TRAP	6	/* return due to DOS-debugger request */

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/*

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 * function codes when invoking new vm86()

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 */

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#define VM86_PLUS_INSTALL_CHECK	0

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#define VM86_ENTER		1

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#define VM86_ENTER_NO_BYPASS	2

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#define	VM86_REQUEST_IRQ	3

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#define VM86_FREE_IRQ		4

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#define VM86_GET_IRQ_BITS	5

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#define VM86_GET_AND_RESET_IRQ	6

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/*

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 * This is the stack-layout seen by the user space program when we have

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 * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout

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 * is 'kernel_vm86_regs' (see below).

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 */

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struct vm86_regs {

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/*

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 * normal regs, with special meaning for the segment descriptors..

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 */

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	long ebx;

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	long ecx;

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	long edx;

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	long esi;

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	long edi;

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	long ebp;

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	long eax;

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	long __null_ds;

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	long __null_es;

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	long __null_fs;

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	long __null_gs;

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	long orig_eax;

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	long eip;

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	unsigned short cs, __csh;

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	long eflags;

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	long esp;

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	unsigned short ss, __ssh;

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/*

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 * these are specific to v86 mode:

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 */

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	unsigned short es, __esh;

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	unsigned short ds, __dsh;

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	unsigned short fs, __fsh;

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	unsigned short gs, __gsh;

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};

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struct revectored_struct {

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	unsigned long __map[8];			/* 256 bits */

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};

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struct vm86_struct {

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	struct vm86_regs regs;

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	unsigned long flags;

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	unsigned long screen_bitmap;		/* unused, preserved by vm86() */

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	unsigned long cpu_type;

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	struct revectored_struct int_revectored;

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	struct revectored_struct int21_revectored;

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};

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/*

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 * flags masks

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 */

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#define VM86_SCREEN_BITMAP	0x0001        /* no longer supported */

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struct vm86plus_info_struct {

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	unsigned long force_return_for_pic:1;

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	unsigned long vm86dbg_active:1;       /* for debugger */

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	unsigned long vm86dbg_TFpendig:1;     /* for debugger */

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	unsigned long unused:28;

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	unsigned long is_vm86pus:1;	      /* for vm86 internal use */

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	unsigned char vm86dbg_intxxtab[32];   /* for debugger */

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};

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struct vm86plus_struct {

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	struct vm86_regs regs;

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	unsigned long flags;

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	unsigned long screen_bitmap;

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	unsigned long cpu_type;

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	struct revectored_struct int_revectored;

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	struct revectored_struct int21_revectored;

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	struct vm86plus_info_struct vm86plus;

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};

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#endif /* _UAPI_ASM_X86_VM86_H */

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