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; /* 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 */ 110 111 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