LXR linux-bk/include/asm-ppc64/bootinfo.h

   1/*
   2 * Non-machine dependent bootinfo structure.  Basic idea
   3 * borrowed from the m68k.
   4 *
   5 * Copyright (C) 1999 Cort Dougan <cort@ppc.kernel.org>
   6 * Copyright (c) 2001 PPC64 Team, IBM Corp 
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License
  10 * as published by the Free Software Foundation; either version
  11 * 2 of the License, or (at your option) any later version.
  12 */
  13
  14
  15#ifndef _PPC64_BOOTINFO_H
  16#define _PPC64_BOOTINFO_H
  17
  18#include <asm/types.h>
  19
  20/* We use a u32 for the type of the fields since they're written by
  21 * the bootloader which is a 32-bit process and read by the kernel
  22 * which is a 64-bit process.  This way they can both agree on the
  23 * size of the type.
  24 */
  25typedef u32 bi_rec_field;
  26
  27struct bi_record {
  28        bi_rec_field tag;       /* tag ID */
  29        bi_rec_field size;      /* size of record (in bytes) */
  30        bi_rec_field data[0];   /* data */
  31};
  32
  33#define BI_FIRST                0x1010  /* first record - marker */
  34#define BI_LAST                 0x1011  /* last record - marker */
  35#define BI_CMD_LINE             0x1012
  36#define BI_BOOTLOADER_ID        0x1013
  37#define BI_INITRD               0x1014
  38#define BI_SYSMAP               0x1015
  39#define BI_MACHTYPE             0x1016
  40
  41static __inline__ struct bi_record * bi_rec_init(unsigned long addr)
  42{
  43        struct bi_record *bi_recs;
  44        bi_recs = (struct bi_record *)_ALIGN(addr, PAGE_SIZE);
  45        bi_recs->size = 0;
  46        return bi_recs;
  47}
  48
  49static __inline__ struct bi_record * bi_rec_alloc(struct bi_record *rec,
  50                                                  unsigned long args)
  51{
  52        rec = (struct bi_record *)((unsigned long)rec + rec->size);
  53        rec->size = sizeof(struct bi_record) + args*sizeof(bi_rec_field);
  54        return rec;
  55}
  56
  57static __inline__ struct bi_record * bi_rec_alloc_bytes(struct bi_record *rec,
  58                                                        unsigned long bytes)
  59{
  60        rec = (struct bi_record *)((unsigned long)rec + rec->size);
  61        rec->size = sizeof(struct bi_record) + bytes;
  62        return rec;
  63}
  64
  65static __inline__ struct bi_record * bi_rec_next(struct bi_record *rec)
  66{
  67        return (struct bi_record *)((unsigned long)rec + rec->size);
  68}
  69
  70#endif /* _PPC64_BOOTINFO_H */
  71