arch/arm26/boot/compressed/uncompress.h

   1 /*
   2  *
   3  *  Copyright (C) 1996 Russell King
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #define VIDMEM ((char *)0x02000000)
  10
  11 int video_num_columns, video_num_lines, video_size_row;
  12 int white, bytes_per_char_h;
  13 extern unsigned long con_charconvtable[256];
  14
  15 struct param_struct {
  16         unsigned long page_size;
  17         unsigned long nr_pages;
  18         unsigned long ramdisk_size;
  19         unsigned long mountrootrdonly;
  20         unsigned long rootdev;
  21         unsigned long video_num_cols;
  22         unsigned long video_num_rows;
  23         unsigned long video_x;
  24         unsigned long video_y;
  25         unsigned long memc_control_reg;
  26         unsigned char sounddefault;
  27         unsigned char adfsdrives;
  28         unsigned char bytes_per_char_h;
  29         unsigned char bytes_per_char_v;
  30         unsigned long unused[256/4-11];
  31 };
  32
  33 static struct param_struct *params = (struct param_struct *)0x0207c000;
  34
  35 /*
  36  * This does not append a newline
  37  */
  38 static void puts(const char *s)
  39 {
  40         extern void ll_write_char(char *, unsigned long);
  41         int x,y;
  42         unsigned char c;
  43         char *ptr;
  44
  45         x = params->video_x;
  46         y = params->video_y;
  47
  48         while ( ( c = *(unsigned char *)s++ ) != '\0' ) {
  49                 if ( c == '\n' ) {
  50                         x = 0;
  51                         if ( ++y >= video_num_lines ) {
  52                                 y--;
  53                         }
  54                 } else {
  55                         ptr = VIDMEM + ((y*video_num_columns*params->bytes_per_char_v+x)*bytes_per_char_h);
  56                         ll_write_char(ptr, c|(white<<16));
  57                         if ( ++x >= video_num_columns ) {
  58                                 x = 0;
  59                                 if ( ++y >= video_num_lines ) {
  60                                         y--;
  61                                 }
  62                         }
  63                 }
  64         }
  65
  66         params->video_x = x;
  67         params->video_y = y;
  68 }
  69
  70 static void error(char *x);
  71
  72 /*
  73  * Setup for decompression
  74  */
  75 static void arch_decomp_setup(void)
  76 {
  77         int i;
  78
  79         video_num_lines = params->video_num_rows;
  80         video_num_columns = params->video_num_cols;
  81         bytes_per_char_h = params->bytes_per_char_h;
  82         video_size_row = video_num_columns * bytes_per_char_h;
  83         if (bytes_per_char_h == 4)
  84                 for (i = 0; i < 256; i++)
  85                         con_charconvtable[i] =
  86                                 (i & 128 ? 1 << 0  : 0) |
  87                                 (i & 64  ? 1 << 4  : 0) |
  88                                 (i & 32  ? 1 << 8  : 0) |
  89                                 (i & 16  ? 1 << 12 : 0) |
  90                                 (i & 8   ? 1 << 16 : 0) |
  91                                 (i & 4   ? 1 << 20 : 0) |
  92                                 (i & 2   ? 1 << 24 : 0) |
  93                                 (i & 1   ? 1 << 28 : 0);
  94         else
  95                 for (i = 0; i < 16; i++)
  96                         con_charconvtable[i] =
  97                                 (i & 8   ? 1 << 0  : 0) |
  98                                 (i & 4   ? 1 << 8  : 0) |
  99                                 (i & 2   ? 1 << 16 : 0) |
 100                                 (i & 1   ? 1 << 24 : 0);
 101
 102         white = bytes_per_char_h == 8 ? 0xfc : 7;
 103
 104         if (params->nr_pages * params->page_size < 4096*1024) error("<4M of mem\n");
 105 }
 106
 107 /*
 108  * nothing to do
 109  */
 110 #define arch_decomp_wdog()