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 Russel King
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9 #ifndef __ASM_AVR32_SETUP_H__
  10 #define __ASM_AVR32_SETUP_H__
  11
  12 #define COMMAND_LINE_SIZE 256
  13
  14 /* Magic number indicating that a tag table is present */
  15 #define ATAG_MAGIC      0xa2a25441
  16
  17 #ifndef __ASSEMBLY__
  18
  19 /*
  20  * Generic memory range, used by several tags.
  21  *
  22  *   addr is always physical.
  23  *   size is measured in bytes.
  24  *   next is for use by the OS, e.g. for grouping regions into
  25  *        linked lists.
  26  */
  27 struct tag_mem_range {
  28         u32                     addr;
  29         u32                     size;
  30         struct tag_mem_range *  next;
  31 };
  32
  33 /* The list ends with an ATAG_NONE node. */
  34 #define ATAG_NONE       0x00000000
  35
  36 struct tag_header {
  37         u32 size;
  38         u32 tag;
  39 };
  40
  41 /* The list must start with an ATAG_CORE node */
  42 #define ATAG_CORE       0x54410001
  43
  44 struct tag_core {
  45         u32 flags;
  46         u32 pagesize;
  47         u32 rootdev;
  48 };
  49
  50 /* it is allowed to have multiple ATAG_MEM nodes */
  51 #define ATAG_MEM        0x54410002
  52 /* ATAG_MEM uses tag_mem_range */
  53
  54 /* command line: \0 terminated string */
  55 #define ATAG_CMDLINE    0x54410003
  56
  57 struct tag_cmdline {
  58         char    cmdline[1];     /* this is the minimum size */
  59 };
  60
  61 /* Ramdisk image (may be compressed) */
  62 #define ATAG_RDIMG      0x54410004
  63 /* ATAG_RDIMG uses tag_mem_range */
  64
  65 /* Information about various clocks present in the system */
  66 #define ATAG_CLOCK      0x54410005
  67
  68 struct tag_clock {
  69         u32     clock_id;       /* Which clock are we talking about? */
  70         u32     clock_flags;    /* Special features */
  71         u64     clock_hz;       /* Clock speed in Hz */
  72 };
  73
  74 /* The clock types we know about */
  75 #define ACLOCK_BOOTCPU  0       /* The CPU we're booting from */
  76 #define ACLOCK_HSB      1       /* Deprecated */
  77
  78 /* Memory reserved for the system (e.g. the bootloader) */
  79 #define ATAG_RSVD_MEM   0x54410006
  80 /* ATAG_RSVD_MEM uses tag_mem_range */
  81
  82 /* Ethernet information */
  83
  84 #define ATAG_ETHERNET   0x54410007
  85
  86 struct tag_ethernet {
  87         u8      mac_index;
  88         u8      mii_phy_addr;
  89         u8      hw_address[6];
  90 };
  91
  92 #define AETH_INVALID_PHY        0xff
  93
  94 /* board information information */
  95 #define ATAG_BOARDINFO  0x54410008
  96
  97 struct tag_boardinfo {
  98         u32     board_number;
  99 };
 100
 101 struct tag {
 102         struct tag_header hdr;
 103         union {
 104                 struct tag_core core;
 105                 struct tag_mem_range mem_range;
 106                 struct tag_cmdline cmdline;
 107                 struct tag_clock clock;
 108                 struct tag_ethernet ethernet;
 109                 struct tag_boardinfo boardinfo;
 110         } u;
 111 };
 112
 113 struct tagtable {
 114         u32     tag;
 115         int     (*parse)(struct tag *);
 116 };
 117
 118 #define __tag __attribute_used__ __attribute__((__section__(".taglist")))
 119 #define __tagtable(tag, fn)                                             \
 120         static struct tagtable __tagtable_##fn __tag = { tag, fn }
 121
 122 #define tag_member_present(tag,member)                                  \
 123         ((unsigned long)(&((struct tag *)0L)->member + 1)               \
 124          <= (tag)->hdr.size * 4)
 125
 126 #define tag_next(t)     ((struct tag *)((u32 *)(t) + (t)->hdr.size))
 127 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
 128
 129 #define for_each_tag(t,base)                                            \
 130         for (t = base; t->hdr.size; t = tag_next(t))
 131
 132 #endif /* !__ASSEMBLY__ */
 133
 134 #endif /* __ASM_AVR32_SETUP_H__ */