cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vm86.h (3201B)

      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
     63struct 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
     93struct revectored_struct {
     94	unsigned long __map[8];			/* 256 bits */
     95};
     96
     97struct vm86_struct {
     98	struct vm86_regs regs;
     99	unsigned long flags;
    100	unsigned long screen_bitmap;		/* unused, preserved by vm86() */
    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        /* no longer supported */
    110
    111struct 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};
    119struct 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 */