// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
// Ported from Linux kernel include/uapi/linux/screen_info.h

const std = @import("std");

pub const ScreenInfo = extern struct{
    orig_x: u8 align(1),             // 0x00
    orig_y: u8 align(1),             // 0x01
    ext_mem_k: u16 align(1),         // 0x02
    orig_video_page: u16 align(1),   // 0x04
    orig_video_mode: u8 align(1),    // 0x06
    orig_video_cols: u8 align(1),    // 0x07
    flags: u8 align(1),              // 0x08
    unused2: u8 align(1),            // 0x09
    orig_video_ega_bx: u16 align(1), // 0x0a
    unused3: u16 align(1),           // 0x0c
    orig_video_lines: u8 align(1),   // 0x0e
    orig_video_isVGA: u8 align(1),   // 0x0f
    orig_video_points: u16 align(1), // 0x10

    // VESA graphic mode -- linear frame buffer
    lfb_width: u16 align(1),         // 0x12
    lfb_height: u16 align(1),        // 0x14
    lfb_depth: u16 align(1),         // 0x16
    lfb_base: u32 align(1),          // 0x18
    lfb_size: u32 align(1),          // 0x1c
    cl_magic: u16 align(1),          // 0x20
    cl_offset: u16 align(1),         // 0x22
    lfb_linelength: u16 align(1),    // 0x24
    red_size: u8 align(1),           // 0x26
    red_pos: u8 align(1),            // 0x27
    green_size: u8 align(1),         // 0x28
    green_pos: u8 align(1),          // 0x29
    blue_size: u8 align(1),          // 0x2a
    blue_pos: u8 align(1),           // 0x2b
    rsvd_size: u8 align(1),          // 0x2c
    rsvd_pos: u8 align(1),           // 0x2d
    vesapm_seg: u16 align(1),        // 0x2e
    vesapm_off: u16 align(1),        // 0x30
    pages: u16 align(1),             // 0x32
    vesa_attributes: u16 align(1),   // 0x34
    capabilities: u32 align(1),      // 0x36
    ext_lfb_base: u32 align(1),      // 0x3a
    _reserved: [2]u8 align(1),       // 0x3e
};

// Common video types
pub const VideoType = enum(u8) {
    MDA = 0x10,     // Monochrome Text Display
    CGA = 0x11,     // CGA Display
    EGAM = 0x20,    // EGA/VGA in Monochrome Mode
    EGAC = 0x21,    // EGA in Color Mode
    VGAC = 0x22,    // VGA+ in Color Mode
    VLFB = 0x23,    // VESA VGA in graphic mode
    EFI = 0x70,     // EFI graphic mode
};

// Video flags
pub const VIDEO_FLAGS_NOCURSOR: u8 = 1 << 0; // The video mode has no cursor set

// Video capabilities
pub const VIDEO_CAPABILITY_SKIP_QUIRKS: u32 = 1 << 0;
pub const VIDEO_CAPABILITY_64BIT_BASE: u32 = 1 << 1; // Frame buffer base is 64-bit

comptime {
    std.debug.assert(@sizeOf(ScreenInfo) == 0x40);
}