arch/avr32/include/asm/setup.h

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * Based on linux/include/asm-arm/setup.h
   5  *   Copyright (C) 1997-1999 Russell King
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __ASM_AVR32_SETUP_H__
  12 #define __ASM_AVR32_SETUP_H__
  13
  14 #define COMMAND_LINE_SIZE 256
  15
  16 #ifdef __KERNEL__
  17
  18 /* Magic number indicating that a tag table is present */
  19 #define ATAG_MAGIC      0xa2a25441
  20
  21 #ifndef __ASSEMBLY__
  22
  23 /*
  24  * Generic memory range, used by several tags.
  25  *
  26  *   addr is always physical.
  27  *   size is measured in bytes.
  28  *   next is for use by the OS, e.g. for grouping regions into
  29  *        linked lists.
  30  */
  31 struct tag_mem_range {
  32         u32                     addr;
  33         u32                     size;
  34         struct tag_mem_range *  next;
  35 };
  36
  37 /* The list ends with an ATAG_NONE node. */
  38 #define ATAG_NONE       0x00000000
  39
  40 struct tag_header {
  41         u32 size;
  42         u32 tag;
  43 };
  44
  45 /* The list must start with an ATAG_CORE node */
  46 #define ATAG_CORE       0x54410001
  47
  48 struct tag_core {
  49         u32 flags;
  50         u32 pagesize;
  51         u32 rootdev;
  52 };
  53
  54 /* it is allowed to have multiple ATAG_MEM nodes */
  55 #define ATAG_MEM        0x54410002
  56 /* ATAG_MEM uses tag_mem_range */
  57
  58 /* command line: \0 terminated string */
  59 #define ATAG_CMDLINE    0x54410003
  60
  61 struct tag_cmdline {
  62         char    cmdline[1];     /* this is the minimum size */
  63 };
  64
  65 /* Ramdisk image (may be compressed) */
  66 #define ATAG_RDIMG      0x54410004
  67 /* ATAG_RDIMG uses tag_mem_range */
  68
  69 /* Information about various clocks present in the system */
  70 #define ATAG_CLOCK      0x54410005
  71
  72 struct tag_clock {
  73         u32     clock_id;       /* Which clock are we talking about? */
  74         u32     clock_flags;    /* Special features */
  75         u64     clock_hz;       /* Clock speed in Hz */
  76 };
  77
  78 /* The clock types we know about */
  79 #define CLOCK_BOOTCPU   0
  80
  81 /* Memory reserved for the system (e.g. the bootloader) */
  82 #define ATAG_RSVD_MEM   0x54410006
  83 /* ATAG_RSVD_MEM uses tag_mem_range */
  84
  85 /* Ethernet information */
  86
  87 #define ATAG_ETHERNET   0x54410007
  88
  89 struct tag_ethernet {
  90         u8      mac_index;
  91         u8      mii_phy_addr;
  92         u8      hw_address[6];
  93 };
  94
  95 #define ETH_INVALID_PHY 0xff
  96
  97 struct tag {
  98         struct tag_header hdr;
  99         union {
 100                 struct tag_core core;
 101                 struct tag_mem_range mem_range;
 102                 struct tag_cmdline cmdline;
 103                 struct tag_clock clock;
 104                 struct tag_ethernet ethernet;
 105         } u;
 106 };
 107
 108 struct tagtable {
 109         u32     tag;
 110         int     (*parse)(struct tag *);
 111 };
 112
 113 #define __tag __used __attribute__((__section__(".taglist.init")))
 114 #define __tagtable(tag, fn)                                             \
 115         static struct tagtable __tagtable_##fn __tag = { tag, fn }
 116
 117 #define tag_member_present(tag,member)                                  \
 118         ((unsigned long)(&((struct tag *)0L)->member + 1)               \
 119          <= (tag)->hdr.size * 4)
 120
 121 #define tag_next(t)     ((struct tag *)((u32 *)(t) + (t)->hdr.size))
 122 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
 123
 124 #define for_each_tag(t,base)                                            \
 125         for (t = base; t->hdr.size; t = tag_next(t))
 126
 127 extern struct tag *bootloader_tags;
 128
 129 extern resource_size_t fbmem_start;
 130 extern resource_size_t fbmem_size;
 131
 132 void setup_processor(void);
 133
 134 #endif /* !__ASSEMBLY__ */
 135
 136 #endif  /*  __KERNEL__  */
 137
 138 #endif /* __ASM_AVR32_SETUP_H__ */