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File vm86.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_X86_VM86_H
#define _ASM_X86_VM86_H

/*
 * I'm guessing at the VIF/VIP flag usage, but hope that this is how
 * the Pentium uses them. Linux will return from vm86 mode when both
 * VIF and VIP is set.
 *
 * On a Pentium, we could probably optimize the virtual flags directly
 * in the eflags register instead of doing it "by hand" in vflags...
 *
 * Linus
 */

#include <asm/processor-flags.h>

#define BIOSSEG		0x0f000

#define CPU_086		0
#define CPU_186		1
#define CPU_286		2
#define CPU_386		3
#define CPU_486		4
#define CPU_586		5

/*
 * Return values for the 'vm86()' system call
 */
#define VM86_TYPE(retval)	((retval) & 0xff)
#define VM86_ARG(retval)	((retval) >> 8)

#define VM86_SIGNAL	0	/* return due to signal */
#define VM86_UNKNOWN	1	/* unhandled GP fault
				   - IO-instruction or similar */
#define VM86_INTx	2	/* int3/int x instruction (ARG = x) */
#define VM86_STI	3	/* sti/popf/iret instruction enabled
				   virtual interrupts */

/*
 * Additional return values when invoking new vm86()
 */
#define VM86_PICRETURN	4	/* return due to pending PIC request */
#define VM86_TRAP	6	/* return due to DOS-debugger request */

/*
 * function codes when invoking new vm86()
 */
#define VM86_PLUS_INSTALL_CHECK	0
#define VM86_ENTER		1
#define VM86_ENTER_NO_BYPASS	2
#define	VM86_REQUEST_IRQ	3
#define VM86_FREE_IRQ		4
#define VM86_GET_IRQ_BITS	5
#define VM86_GET_AND_RESET_IRQ	6

/*
 * This is the stack-layout seen by the user space program when we have
 * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
 * is 'kernel_vm86_regs' (see below).
 */

struct vm86_regs {
/*
 * normal regs, with special meaning for the segment descriptors..
 */
	long ebx;
	long ecx;
	long edx;
	long esi;
	long edi;
	long ebp;
	long eax;
	long __null_ds;
	long __null_es;
	long __null_fs;
	long __null_gs;
	long orig_eax;
	long eip;
	unsigned short cs, __csh;
	long eflags;
	long esp;
	unsigned short ss, __ssh;
/*
 * these are specific to v86 mode:
 */
	unsigned short es, __esh;
	unsigned short ds, __dsh;
	unsigned short fs, __fsh;
	unsigned short gs, __gsh;
};

struct revectored_struct {
	unsigned long __map[8];			/* 256 bits */
};

struct vm86_struct {
	struct vm86_regs regs;
	unsigned long flags;
	unsigned long screen_bitmap;
	unsigned long cpu_type;
	struct revectored_struct int_revectored;
	struct revectored_struct int21_revectored;
};

/*
 * flags masks
 */
#define VM86_SCREEN_BITMAP	0x0001

struct vm86plus_info_struct {
	unsigned long force_return_for_pic:1;
	unsigned long vm86dbg_active:1;       /* for debugger */
	unsigned long vm86dbg_TFpendig:1;     /* for debugger */
	unsigned long unused:28;
	unsigned long is_vm86pus:1;	      /* for vm86 internal use */
	unsigned char vm86dbg_intxxtab[32];   /* for debugger */
};
struct vm86plus_struct {
	struct vm86_regs regs;
	unsigned long flags;
	unsigned long screen_bitmap;
	unsigned long cpu_type;
	struct revectored_struct int_revectored;
	struct revectored_struct int21_revectored;
	struct vm86plus_info_struct vm86plus;
};

#endif /* _ASM_X86_VM86_H */

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2026-02-11 09:31:31
..	DIR	-	drwxr-xr-x	2026-02-11 09:31:31
a.out.h	text/x-c	756 B	-rw-r--r--	2026-01-22 12:58:37
amd_hsmp.h	text/x-c	8.68 KB	-rw-r--r--	2026-01-22 12:58:37
auxvec.h	text/x-c	618 B	-rw-r--r--	2026-01-22 12:58:37
bitsperlong.h	text/x-c	321 B	-rw-r--r--	2026-01-22 12:58:37
boot.h	text/x-c	323 B	-rw-r--r--	2026-01-22 12:58:37
bootparam.h	text/x-c	7.58 KB	-rw-r--r--	2026-01-22 12:58:37
bpf_perf_event.h	text/x-c	40 B	-rw-r--r--	2026-01-22 12:58:37
byteorder.h	text/x-c	176 B	-rw-r--r--	2026-01-22 12:58:37
debugreg.h	text/x-c	3.25 KB	-rw-r--r--	2026-01-22 12:58:37
e820.h	text/x-c	2.52 KB	-rw-r--r--	2026-01-22 12:58:37
errno.h	text/x-c	31 B	-rw-r--r--	2026-01-22 12:58:37
fcntl.h	text/x-c	31 B	-rw-r--r--	2026-01-22 12:58:37
hw_breakpoint.h	text/plain	69 B	-rw-r--r--	2026-01-22 12:58:37
hwcap2.h	text/x-c	270 B	-rw-r--r--	2026-01-22 12:58:37
ioctl.h	text/x-c	31 B	-rw-r--r--	2026-01-22 12:58:37
ioctls.h	text/x-c	32 B	-rw-r--r--	2026-01-22 12:58:37
ipcbuf.h	text/x-c	32 B	-rw-r--r--	2026-01-22 12:58:37
ist.h	text/x-c	854 B	-rw-r--r--	2026-01-22 12:58:37
kvm.h	text/x-c	11.44 KB	-rw-r--r--	2026-01-22 12:58:37
kvm_para.h	text/x-c	4.24 KB	-rw-r--r--	2026-01-22 12:58:37
kvm_perf.h	text/x-c	388 B	-rw-r--r--	2026-01-22 12:58:37
ldt.h	text/x-c	1.28 KB	-rw-r--r--	2026-01-22 12:58:37
mce.h	text/x-c	1.65 KB	-rw-r--r--	2026-01-22 12:58:37
mman.h	text/x-c	1002 B	-rw-r--r--	2026-01-22 12:58:37
msgbuf.h	text/x-c	1.03 KB	-rw-r--r--	2026-01-22 12:58:37
msr.h	text/x-c	346 B	-rw-r--r--	2026-01-22 12:58:37
mtrr.h	text/x-c	4.13 KB	-rw-r--r--	2026-01-22 12:58:37
param.h	text/x-c	31 B	-rw-r--r--	2026-01-22 12:58:37
perf_regs.h	text/x-c	1.37 KB	-rw-r--r--	2026-01-22 12:58:37
poll.h	text/x-c	30 B	-rw-r--r--	2026-01-22 12:58:37
posix_types.h	text/x-c	224 B	-rw-r--r--	2026-01-22 12:58:37
posix_types_32.h	text/x-c	765 B	-rw-r--r--	2026-01-22 12:58:37
posix_types_64.h	text/x-c	609 B	-rw-r--r--	2026-01-22 12:58:37
posix_types_x32.h	text/x-c	581 B	-rw-r--r--	2026-01-22 12:58:37
prctl.h	text/x-c	618 B	-rw-r--r--	2026-01-22 12:58:37
processor-flags.h	text/x-c	6.47 KB	-rw-r--r--	2026-01-22 12:58:37
ptrace-abi.h	text/x-c	1.99 KB	-rw-r--r--	2026-01-22 12:58:37
ptrace.h	text/x-c	1.46 KB	-rw-r--r--	2026-01-22 12:58:37
resource.h	text/x-c	34 B	-rw-r--r--	2026-01-22 12:58:37
sembuf.h	text/x-c	1.02 KB	-rw-r--r--	2026-01-22 12:58:37
setup.h	text/plain	6 B	-rw-r--r--	2026-01-22 12:58:37
sgx.h	text/x-c	8.15 KB	-rw-r--r--	2026-01-22 12:58:37
shmbuf.h	text/x-c	1.23 KB	-rw-r--r--	2026-01-22 12:58:37
sigcontext.h	text/x-c	9.5 KB	-rw-r--r--	2026-01-22 12:58:37
sigcontext32.h	text/x-c	247 B	-rw-r--r--	2026-01-22 12:58:37
siginfo.h	text/x-c	422 B	-rw-r--r--	2026-01-22 12:58:37
signal.h	text/x-c	2.83 KB	-rw-r--r--	2026-01-22 12:58:37
socket.h	text/x-c	32 B	-rw-r--r--	2026-01-22 12:58:37
sockios.h	text/x-c	33 B	-rw-r--r--	2026-01-22 12:58:37
stat.h	text/x-c	3.06 KB	-rw-r--r--	2026-01-22 12:58:37
statfs.h	text/x-c	416 B	-rw-r--r--	2026-01-22 12:58:37
svm.h	text/x-c	9.54 KB	-rw-r--r--	2026-01-22 12:58:37
swab.h	text/x-c	724 B	-rw-r--r--	2026-01-22 12:58:37
termbits.h	text/x-c	34 B	-rw-r--r--	2026-01-22 12:58:37
termios.h	text/x-c	33 B	-rw-r--r--	2026-01-22 12:58:37
types.h	text/x-c	152 B	-rw-r--r--	2026-01-22 12:58:37
ucontext.h	text/x-c	2.07 KB	-rw-r--r--	2026-01-22 12:58:37
unistd.h	text/x-c	359 B	-rw-r--r--	2026-01-22 12:58:37
unistd_32.h	text/x-c	10.87 KB	-rw-r--r--	2026-01-22 12:58:37
unistd_64.h	text/x-c	9.1 KB	-rw-r--r--	2026-01-22 12:58:37
unistd_x32.h	text/x-c	16.03 KB	-rw-r--r--	2026-01-22 12:58:37
vm86.h	text/x-c	3.04 KB	-rw-r--r--	2026-01-22 12:58:37
vmx.h	text/x-c	7.2 KB	-rw-r--r--	2026-01-22 12:58:37
vsyscall.h	text/x-c	263 B	-rw-r--r--	2026-01-22 12:58:37

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