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 extern char __sysmap_begin, __sysmap_end;
  19
  20 extern int strcmp(const char *s1, const char *s2);
  21 extern char *avail_ram, *avail_high;
  22 extern char *end_avail;
  23
  24 unsigned int heap_use, heap_max;
  25
  26 struct memchunk {
  27     unsigned int size;
  28     struct memchunk *next;
  29 };
  30
  31 static struct memchunk *freechunks;
  32
  33 static void *zalloc(unsigned size)
  34 {
  35     void *p;
  36     struct memchunk **mpp, *mp;
  37
  38     size = (size + 7) & -8;
  39     heap_use += size;
  40     if (heap_use > heap_max)
  41         heap_max = heap_use;
  42     for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
  43         if (mp->size == size) {
  44             *mpp = mp->next;
  45             return mp;
  46         }
  47     }
  48     p = avail_ram;
  49     avail_ram += size;
  50     if (avail_ram > avail_high)
  51         avail_high = avail_ram;
  52     if (avail_ram > end_avail) {
  53         printf("oops... out of memory\n\r");
  54         pause();
  55     }
  56     return p;
  57 }
  58
  59 #define HEAD_CRC        2
  60 #define EXTRA_FIELD     4
  61 #define ORIG_NAME       8
  62 #define COMMENT         0x10
  63 #define RESERVED        0xe0
  64
  65 void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
  66 {
  67         z_stream s;
  68         int r, i, flags;
  69
  70         /* skip header */
  71         i = 10;
  72         flags = src[3];
  73         if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
  74                 printf("bad gzipped data\n\r");
  75                 exit();
  76         }
  77         if ((flags & EXTRA_FIELD) != 0)
  78                 i = 12 + src[10] + (src[11] << 8);
  79         if ((flags & ORIG_NAME) != 0)
  80                 while (src[i++] != 0)
  81                         ;
  82         if ((flags & COMMENT) != 0)
  83                 while (src[i++] != 0)
  84                         ;
  85         if ((flags & HEAD_CRC) != 0)
  86                 i += 2;
  87         if (i >= *lenp) {
  88                 printf("gunzip: ran out of data in header\n\r");
  89                 exit();
  90         }
  91
  92         /* Initialize ourself. */
  93         s.workspace = zalloc(zlib_inflate_workspacesize());
  94         r = zlib_inflateInit2(&s, -MAX_WBITS);
  95         if (r != Z_OK) {
  96                 printf("zlib_inflateInit2 returned %d\n\r", r);
  97                 exit();
  98         }
  99         s.next_in = src + i;
 100         s.avail_in = *lenp - i;
 101         s.next_out = dst;
 102         s.avail_out = dstlen;
 103         r = zlib_inflate(&s, Z_FINISH);
 104         if (r != Z_OK && r != Z_STREAM_END) {
 105                 printf("inflate returned %d msg: %s\n\r", r, s.msg);
 106                 exit();
 107         }
 108         *lenp = s.next_out - (unsigned char *) dst;
 109         zlib_inflateEnd(&s);
 110 }
 111
 112 /* Make a bi_rec in OF.  We need to be passed a name for BI_BOOTLOADER_ID,
 113  * a machine type for BI_MACHTYPE, and the location where the end of the
 114  * bootloader is (PROG_START + PROG_SIZE)
 115  */
 116 void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
 117                 unsigned long progend)
 118 {
 119         unsigned long sysmap_size;
 120         struct bi_record *rec;
 121
 122         /* Figure out the size of a possible System.map we're going to
 123          * pass along.
 124          * */
 125         sysmap_size = (unsigned long)(&__sysmap_end) -
 126                 (unsigned long)(&__sysmap_begin);
 127
 128         /* leave a 1MB gap then align to the next 1MB boundary */
 129         addr = _ALIGN(addr+ (1<<20) - 1, (1<<20));
 130         /* oldworld machine seem very unhappy about this. -- Tom */
 131         if (addr >= progend)
 132                 claim(addr, 0x1000, 0);
 133
 134         rec = (struct bi_record *)addr;
 135         rec->tag = BI_FIRST;
 136         rec->size = sizeof(struct bi_record);
 137         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 138
 139         rec->tag = BI_BOOTLOADER_ID;
 140         sprintf( (char *)rec->data, name);
 141         rec->size = sizeof(struct bi_record) + strlen(name) + 1;
 142         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 143
 144         rec->tag = BI_MACHTYPE;
 145         rec->data[0] = mach;
 146         rec->data[1] = 1;
 147         rec->size = sizeof(struct bi_record) + 2 * sizeof(unsigned long);
 148         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 149
 150         if (sysmap_size) {
 151                 rec->tag = BI_SYSMAP;
 152                 rec->data[0] = (unsigned long)(&__sysmap_begin);
 153                 rec->data[1] = sysmap_size;
 154                 rec->size = sizeof(struct bi_record) + 2 *
 155                         sizeof(unsigned long);
 156                 rec = (struct bi_record *)((unsigned long)rec + rec->size);
 157         }
 158
 159         rec->tag = BI_LAST;
 160         rec->size = sizeof(struct bi_record);
 161         rec = (struct bi_record *)((unsigned long)rec + rec->size);
 162 }