golden hour

/usr/include/asm

File/Folder	Size	Actions
a.out.h	756 B
amd_hsmp.h	11.28 KB
auxvec.h	546 B
bitsperlong.h	321 B
boot.h	323 B
bootparam.h	8.31 KB
bpf_perf_event.h	40 B
byteorder.h	200 B
debugreg.h	3.25 KB
e820.h	2.52 KB
errno.h	31 B
fcntl.h	31 B
hw_breakpoint.h	69 B
hwcap2.h	324 B
ioctl.h	31 B
ioctls.h	32 B
ipcbuf.h	32 B
ist.h	854 B
kvm.h	20.4 KB
kvm_para.h	4.22 KB
kvm_perf.h	388 B
ldt.h	1.28 KB
mce.h	1.69 KB
mman.h	413 B
msgbuf.h	1.05 KB
msr.h	346 B
mtrr.h	3.9 KB
param.h	31 B
perf_regs.h	1.37 KB
poll.h	30 B
posix_types.h	224 B
posix_types_32.h	765 B
posix_types_64.h	609 B
posix_types_x32.h	581 B
prctl.h	1.08 KB
processor-flags.h	6.97 KB
ptrace-abi.h	1.99 KB
ptrace.h	1.46 KB
resource.h	34 B
sembuf.h	1.04 KB
setup.h	6 B
sgx.h	8.15 KB
shmbuf.h	1.29 KB
sigcontext.h	9.5 KB
sigcontext32.h	271 B
siginfo.h	422 B
signal.h	2.02 KB
socket.h	32 B
sockios.h	33 B
stat.h	3.06 KB
statfs.h	416 B
svm.h	9.59 KB
swab.h	724 B
termbits.h	34 B
termios.h	33 B
types.h	31 B
ucontext.h	2.07 KB
unistd.h	623 B
unistd_32.h	11.8 KB
unistd_64.h	9.7 KB
unistd_x32.h	17.01 KB
vm86.h	3.11 KB
vmx.h	7.29 KB
vsyscall.h	263 B

Edit: 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;		/* unused, preserved by vm86() */
	unsigned long cpu_type;
	struct revectored_struct int_revectored;
	struct revectored_struct int21_revectored;
};

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

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 */