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      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 
     63 struct 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 
     93 struct revectored_struct {
     94 	unsigned long __map[8];			/* 256 bits */
     95 };
     96 
     97 struct vm86_struct {
     98 	struct vm86_regs regs;
     99 	unsigned long flags;
    100 	unsigned long screen_bitmap;
    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
    110 
    111 struct 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 };
    119 struct 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 */
    131