/* Copyright (C) 1999,2003,2007,2008,2009  Free Software Foundation, Inc.
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to
 *  deal in the Software without restriction, including without limitation the
 *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 *  sell copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL ANY
 *  DEVELOPER OR DISTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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/**
 * @defgroup    boards_x86-multiboot i586 multiboot common
 * @ingroup     boards
 * @brief       Common files for multiboot enabled kernels
 *
 * @ingroup x86-multiboot
 * @{
 * @file
 * @brief       Architecture specific definitions for multiboot enabled kernels
 */

#ifndef MULTIBOOT_H_
#define MULTIBOOT_H_

#ifdef __cplusplus
extern "C" {
#endif

/** How many bytes from the start of the file we search for the header. */
#define MULTIBOOT_SEARCH                        8192

/** The flags for the Multiboot header. */
#define MULTIBOOT_HEADER_FLAGS 0x00010003

/** The magic field should contain this. */
#define MULTIBOOT_HEADER_MAGIC                  0x1BADB002

/** This should be in %eax. */
#define MULTIBOOT_BOOTLOADER_MAGIC              0x2BADB002

/** The bits in the required part of flags field we don't support. */
#define MULTIBOOT_UNSUPPORTED                   0x0000fffc

/** Alignment of multiboot modules. */
#define MULTIBOOT_MOD_ALIGN                     0x00001000

/** Alignment of the multiboot info structure. */
#define MULTIBOOT_INFO_ALIGN                    0x00000004

/** Flags set in the 'flags' member of the multiboot header. */

/** Align all boot modules on i386 page (4KB) boundaries. */
#define MULTIBOOT_PAGE_ALIGN                    0x00000001

/** Must pass memory information to OS. */
#define MULTIBOOT_MEMORY_INFO                   0x00000002

/** Must pass video information to OS. */
#define MULTIBOOT_VIDEO_MODE                    0x00000004

/** This flag indicates the use of the address fields in the header. */
#define MULTIBOOT_AOUT_KLUDGE                   0x00010000

/** Flags to be set in the 'flags' member of the multiboot info structure. */

/** is there basic lower/upper memory information? */
#define MULTIBOOT_INFO_MEMORY                   0x00000001
/** is there a boot device set? */
#define MULTIBOOT_INFO_BOOTDEV                  0x00000002
/** is the command-line defined? */
#define MULTIBOOT_INFO_CMDLINE                  0x00000004
/** are there modules to do something with? */
#define MULTIBOOT_INFO_MODS                     0x00000008

/** These next two are mutually exclusive */

/** is there a symbol table loaded? */
#define MULTIBOOT_INFO_AOUT_SYMS                0x00000010
/** is there an ELF section header table? */
#define MULTIBOOT_INFO_ELF_SHDR                 0X00000020

/** is there a full memory map? */
#define MULTIBOOT_INFO_MEM_MAP                  0x00000040

/** Is there drive info? */
#define MULTIBOOT_INFO_DRIVE_INFO               0x00000080

/** Is there a config table? */
#define MULTIBOOT_INFO_CONFIG_TABLE             0x00000100

/** Is there a boot loader name? */
#define MULTIBOOT_INFO_BOOT_LOADER_NAME         0x00000200

/** Is there a APM table? */
#define MULTIBOOT_INFO_APM_TABLE                0x00000400

/** Is there video information? */
#define MULTIBOOT_INFO_VIDEO_INFO               0x00000800

#ifndef ASM_FILE

typedef unsigned short multiboot_uint16_t;
typedef unsigned int multiboot_uint32_t;
typedef unsigned long long multiboot_uint64_t;

typedef struct multiboot_header {
    /** Must be MULTIBOOT_MAGIC - see above. */
    multiboot_uint32_t magic;

    /** Feature flags. */
    multiboot_uint32_t flags;

    /** The above fields plus this one must equal 0 mod 2^32. */
    multiboot_uint32_t checksum;

    /** These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */
    multiboot_uint32_t header_addr;
    multiboot_uint32_t load_addr;
    multiboot_uint32_t load_end_addr;
    multiboot_uint32_t bss_end_addr;
    multiboot_uint32_t entry_addr;

    /** These are only valid if MULTIBOOT_VIDEO_MODE is set. */
    multiboot_uint32_t mode_type;
    multiboot_uint32_t width;
    multiboot_uint32_t height;
    multiboot_uint32_t depth;
} multiboot_header_t;

/** The symbol table for a.out. */
struct multiboot_aout_symbol_table {
    multiboot_uint32_t tabsize;
    multiboot_uint32_t strsize;
    multiboot_uint32_t addr;
    multiboot_uint32_t reserved;
};
typedef struct multiboot_aout_symbol_table multiboot_aout_symbol_table_t;

/** The section header table for ELF. */
struct multiboot_elf_section_header_table {
    multiboot_uint32_t num;
    multiboot_uint32_t size;
    multiboot_uint32_t addr;
    multiboot_uint32_t shndx;
};
typedef struct multiboot_elf_section_header_table multiboot_elf_section_header_table_t;

struct multiboot_info {
    /** Multiboot info version number */
    multiboot_uint32_t flags;

    /** Available memory from BIOS */
    multiboot_uint32_t mem_lower;
    multiboot_uint32_t mem_upper;

    /** "root" partition */
    multiboot_uint32_t boot_device;

    /** Kernel command line */
    multiboot_uint32_t cmdline;

    /** Boot-Module list */
    multiboot_uint32_t mods_count;
    multiboot_uint32_t mods_addr;

    union {
        multiboot_aout_symbol_table_t aout_sym;
        multiboot_elf_section_header_table_t elf_sec;
    } u;

    /** Memory Mapping buffer */
    multiboot_uint32_t mmap_length;
    multiboot_uint32_t mmap_addr;

    /** Drive Info buffer */
    multiboot_uint32_t drives_length;
    multiboot_uint32_t drives_addr;

    /** ROM configuration table */
    multiboot_uint32_t config_table;

    /** Boot Loader Name */
    multiboot_uint32_t boot_loader_name;

    /** APM table */
    multiboot_uint32_t apm_table;

    /** Video */
    multiboot_uint32_t vbe_control_info;
    multiboot_uint32_t vbe_mode_info;
    multiboot_uint16_t vbe_mode;
    multiboot_uint16_t vbe_interface_seg;
    multiboot_uint16_t vbe_interface_off;
    multiboot_uint16_t vbe_interface_len;
};
typedef struct multiboot_info multiboot_info_t;

struct multiboot_mmap_entry {
    multiboot_uint32_t size;
    multiboot_uint64_t addr;
    multiboot_uint64_t len;
#define MULTIBOOT_MEMORY_AVAILABLE              1
#define MULTIBOOT_MEMORY_RESERVED               2
    multiboot_uint32_t type;
} __attribute__((packed));
typedef struct multiboot_mmap_entry multiboot_memory_map_t;

struct multiboot_mod_list {
    /** the memory used goes from bytes 'mod_start' to 'mod_end-1' inclusive */
    multiboot_uint32_t mod_start;
    multiboot_uint32_t mod_end;

    /** Module command line */
    multiboot_uint32_t cmdline;

    /** padding to take it to 16 bytes (must be zero) */
    multiboot_uint32_t pad;
};
typedef struct multiboot_mod_list multiboot_module_t;

#endif  /** ! ASM_FILE */

#ifdef __cplusplus
}
#endif

#endif  /** ! MULTIBOOT_H_ */
/** @} */