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131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
3 years ago
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _ASM_X86_VM86_H
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#define _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 /* _ASM_X86_VM86_H */
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