arch/ppc/boot/openfirmware/common.c

   1 /*
   2  * Copyright (C) Paul Mackerras 1997.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include "nonstdio.h"
  11 #include "of1275.h"
  12 #include <linux/string.h>
  13 #include <linux/zlib.h>
  14 #include <asm/bootinfo.h>
  15 #include <asm/page.h>
  16
  17 /* Information from the linker */
  18
  19 extern int strcmp(const char *s1, const char *s2);
  20 extern char *avail_ram, *avail_high;
  21 extern char *end_avail;
  22
  23 unsigned int heap_use, heap_max;
  24
  25 struct memchunk {
  26     unsigned int size;
  27     struct memchunk *next;
  28 };
  29
  30 static struct memchunk *freechunks;
  31
  32 static void *zalloc(unsigned size)
  33 {
  34     void *p;
  35     struct memchunk **mpp, *mp;
  36
  37     size = (size + 7) & -8;
  38     heap_use += size;
  39     if (heap_use > heap_max)
  40         heap_max = heap_use;
  41     for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
  42         if (mp->size == size) {
  43             *mpp = mp->next;
  44             return mp;
  45         }
  46     }
  47     p = avail_ram;
  48     avail_ram += size;
  49     if (avail_ram > avail_high)
  50         avail_high = avail_ram;
  51     if (avail_ram > end_avail) {
  52         printf("oops... out of memory\n\r");
  53         pause();
  54     }
  55     return p;
  56 }
  57
  58 #define HEAD_CRC        2
  59 #define EXTRA_FIELD     4
  60 #define ORIG_NAME       8
  61 #define COMMENT         0x10
  62 #define RESERVED        0xe0
  63
  64 void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
  65 {
  66         z_stream s;
  67         int r, i, flags;
  68
  69         /* skip header */
  70         i = 10;
  71         flags = src[3];
  72         if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
  73                 printf("bad gzipped data\n\r");
  74                 exit();
  75         }
  76         if ((flags & EXTRA_FIELD) != 0)
  77                 i = 12 + src[10] + (src[11] << 8);
  78         if ((flags & ORIG_NAME) != 0)
  79                 while (src[i++] != 0)
  80                         ;
  81         if ((flags & COMMENT) != 0)
  82                 while (src[i++] != 0)
  83                         ;
  84         if ((flags & HEAD_CRC) != 0)
  85                 i += 2;
  86         if (i >= *lenp) {
  87                 printf("gunzip: ran out of data in header\n\r");
  88                 exit();
  89         }
  90
  91         /* Initialize ourself. */
  92         s.workspace = zalloc(zlib_inflate_workspacesize());
  93         r = zlib_inflateInit2(&s, -MAX_WBITS);
  94         if (r != Z_OK) {
  95                 printf("zlib_inflateInit2 returned %d\n\r", r);
  96                 exit();
  97         }
  98         s.next_in = src + i;
  99         s.avail_in = *lenp - i;
 100         s.next_out = dst;
 101         s.avail_out = dstlen;
 102         r = zlib_inflate(&s, Z_FINISH);
 103         if (r != Z_OK && r != Z_STREAM_END) {
 104                 printf("inflate returned %d msg: %s\n\r", r, s.msg);
 105                 exit();
 106         }
 107         *lenp = s.next_out - (unsigned char *) dst;
 108         zlib_inflateEnd(&s);
 109 }
 110
 111 /* Make a bi_rec in OF.  We need to be passed a name for BI_BOOTLOADER_ID,
 112  * a machine type for BI_MACHTYPE, and the location where the end of the
 113  * bootloader is (PROG_START + PROG_SIZE)
 114  */
 115 void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
 116                 unsigned long progend)
 117 {
 118         struct bi_record *rec;
 119
 120
 121         /* leave a 1MB gap then align to the next 1MB boundary */
 122         addr = _ALIGN(addr+ (1<<20) - 1, (1<<20));
 123         /* oldworld machine seem very unhappy about this. -- Tom */
 124         if (addr >= progend)
 125                 claim(addr, 0x1000, 0);
 126
 127         rec = (struct bi_record *)addr;
 128         rec->tag = BI_FIRST;
 129         rec->size = sizeof(struct bi_record);
 130         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 131
 132         rec->tag = BI_BOOTLOADER_ID;
 133         sprintf( (char *)rec->data, name);
 134         rec->size = sizeof(struct bi_record) + strlen(name) + 1;
 135         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 136
 137         rec->tag = BI_MACHTYPE;
 138         rec->data[0] = mach;
 139         rec->data[1] = 1;
 140         rec->size = sizeof(struct bi_record) + 2 * sizeof(unsigned long);
 141         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 142
 143         rec->tag = BI_LAST;
 144         rec->size = sizeof(struct bi_record);
 145         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 146 }