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  */
  25 typedef u32 bi_rec_field;
  26
  27 struct 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
  41 static __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
  49 static __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
  57 static __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
  65 static __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 */