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vm86.h
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/* 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 */