setup.h

Go to the documentation of this file.

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * Based on linux/include/asm-arm/setup.h
 *   Copyright (C) 1997-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_SETUP_H__
#define __ASM_AVR32_SETUP_H__

#include <uapi/asm/setup.h>


/* Magic number indicating that a tag table is present */
#define ATAG_MAGIC  0xa2a25441

#ifndef __ASSEMBLY__

/*
 * Generic memory range, used by several tags.
 *
 *   addr is always physical.
 *   size is measured in bytes.
 *   next is for use by the OS, e.g. for grouping regions into
 *        linked lists.
 */
struct tag_mem_range {
    u32         addr;
    u32         size;
    struct tag_mem_range *  next;
};

/* The list ends with an ATAG_NONE node. */
#define ATAG_NONE   0x00000000

struct tag_header {
    u32 size;
    u32 tag;
};

/* The list must start with an ATAG_CORE node */
#define ATAG_CORE   0x54410001

struct tag_core {
    u32 flags;
    u32 pagesize;
    u32 rootdev;
};

/* it is allowed to have multiple ATAG_MEM nodes */
#define ATAG_MEM    0x54410002
/* ATAG_MEM uses tag_mem_range */

/* command line: \0 terminated string */
#define ATAG_CMDLINE    0x54410003

struct tag_cmdline {
    char    cmdline[1]; /* this is the minimum size */
};

/* Ramdisk image (may be compressed) */
#define ATAG_RDIMG  0x54410004
/* ATAG_RDIMG uses tag_mem_range */

/* Information about various clocks present in the system */
#define ATAG_CLOCK  0x54410005

struct tag_clock {
    u32 clock_id;   /* Which clock are we talking about? */
    u32 clock_flags;    /* Special features */
    u64 clock_hz;   /* Clock speed in Hz */
};

/* The clock types we know about */
#define CLOCK_BOOTCPU   0

/* Memory reserved for the system (e.g. the bootloader) */
#define ATAG_RSVD_MEM   0x54410006
/* ATAG_RSVD_MEM uses tag_mem_range */

/* Ethernet information */

#define ATAG_ETHERNET   0x54410007

struct tag_ethernet {
    u8  mac_index;
    u8  mii_phy_addr;
    u8  hw_address[6];
};

#define ETH_INVALID_PHY 0xff

/* board information */
#define ATAG_BOARDINFO  0x54410008

struct tag_boardinfo {
    u32 board_number;
};

struct tag {
    struct tag_header hdr;
    union {
        struct tag_core core;
        struct tag_mem_range mem_range;
        struct tag_cmdline cmdline;
        struct tag_clock clock;
        struct tag_ethernet ethernet;
        struct tag_boardinfo boardinfo;
    } u;
};

struct tagtable {
    u32 tag;
    int (*parse)(struct tag *);
};

#define __tag __used __attribute__((__section__(".taglist.init")))
#define __tagtable(tag, fn)                     \
    static struct tagtable __tagtable_##fn __tag = { tag, fn }

#define tag_member_present(tag,member)                  \
    ((unsigned long)(&((struct tag *)0L)->member + 1)       \
     <= (tag)->hdr.size * 4)

#define tag_next(t) ((struct tag *)((u32 *)(t) + (t)->hdr.size))
#define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)

#define for_each_tag(t,base)                        \
    for (t = base; t->hdr.size; t = tag_next(t))

extern struct tag *bootloader_tags;

extern resource_size_t fbmem_start;
extern resource_size_t fbmem_size;
extern u32 board_number;

void setup_processor(void);

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_AVR32_SETUP_H__ */