linux kernel struct 之 vm86

linux-4.9.37/arch/x86/include/asm/vm86.h

用于实现VM86模式，这是一种在保护模式下执行16位代码的模式。VM86模式允许在32位保护模式下运行16位代码，通常用于执行VBIOS（视频BIOS）代码。‌

struct vm86 {
    struct vm86plus_struct __user *user_vm86;
    struct pt_regs regs32;
    unsigned long veflags;
    unsigned long veflags_mask;
    unsigned long saved_sp0;

    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;
};