atag_tags.h

/*
    Taken from http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html
    This file is BSD Licensed.
*/
#ifndef ATAG_TAGS_H
#define ATAG_TAGS_H
/* structures for each atag */
struct atag_header {
        uint32_t size; /* length of tag in words including this header */
        uint32_t tag;  /* tag type */
};

struct atag_core {
        uint32_t flags;
        uint32_t pagesize;
        uint32_t rootdev;
};

struct atag_mem {
        uint32_t     size;
        uint32_t     start;
};

struct atag_videotext {
        uint8_t              x;
        uint8_t              y;
        uint16_t             video_page;
        uint8_t              video_mode;
        uint8_t              video_cols;
        uint16_t             video_ega_bx;
        uint8_t              video_lines;
        uint8_t              video_isvga;
        uint16_t             video_points;
};

struct atag_ramdisk {
        uint32_t flags;
        uint32_t size;
        uint32_t start;
};

struct atag_initrd2 {
        uint32_t start;
        uint32_t size;
};

struct atag_serialnr {
        uint32_t low;
        uint32_t high;
};

struct atag_revision {
        uint32_t rev;
};

struct atag_videolfb {
        uint16_t             lfb_width;
        uint16_t             lfb_height;
        uint16_t             lfb_depth;
        uint16_t             lfb_linelength;
        uint32_t             lfb_base;
        uint32_t             lfb_size;
        uint8_t              red_size;
        uint8_t              red_pos;
        uint8_t              green_size;
        uint8_t              green_pos;
        uint8_t              blue_size;
        uint8_t              blue_pos;
        uint8_t              rsvd_size;
        uint8_t              rsvd_pos;
};

struct atag_cmdline {
        char    cmdline[1];
};

struct atag {
        struct atag_header hdr;
        union {
                struct atag_core         core;
                struct atag_mem          mem;
                struct atag_videotext    videotext;
                struct atag_ramdisk      ramdisk;
                struct atag_initrd2      initrd2;
                struct atag_serialnr     serialnr;
                struct atag_revision     revision;
                struct atag_videolfb     videolfb;
                struct atag_cmdline      cmdline;
        } u;
};

#endif