arch/arm/mach-rpc/include/mach/uncompress.h

   1 /*
   2  *  arch/arm/mach-rpc/include/mach/uncompress.h
   3  *
   4  *  Copyright (C) 1996 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #define VIDMEM ((char *)SCREEN_START)
  11
  12 #include <linux/io.h>
  13 #include <mach/hardware.h>
  14 #include <asm/setup.h>
  15 #include <asm/page.h>
  16
  17 int video_size_row;
  18 unsigned char bytes_per_char_h;
  19 extern unsigned long con_charconvtable[256];
  20
  21 struct param_struct {
  22         unsigned long page_size;
  23         unsigned long nr_pages;
  24         unsigned long ramdisk_size;
  25         unsigned long mountrootrdonly;
  26         unsigned long rootdev;
  27         unsigned long video_num_cols;
  28         unsigned long video_num_rows;
  29         unsigned long video_x;
  30         unsigned long video_y;
  31         unsigned long memc_control_reg;
  32         unsigned char sounddefault;
  33         unsigned char adfsdrives;
  34         unsigned char bytes_per_char_h;
  35         unsigned char bytes_per_char_v;
  36         unsigned long unused[256/4-11];
  37 };
  38
  39 static const unsigned long palette_4[16] = {
  40         0x00000000,
  41         0x000000cc,
  42         0x0000cc00,             /* Green   */
  43         0x0000cccc,             /* Yellow  */
  44         0x00cc0000,             /* Blue    */
  45         0x00cc00cc,             /* Magenta */
  46         0x00cccc00,             /* Cyan    */
  47         0x00cccccc,             /* White   */
  48         0x00000000,
  49         0x000000ff,
  50         0x0000ff00,
  51         0x0000ffff,
  52         0x00ff0000,
  53         0x00ff00ff,
  54         0x00ffff00,
  55         0x00ffffff
  56 };
  57
  58 #define palette_setpixel(p)     *(unsigned long *)(IO_START+0x00400000) = 0x10000000|((p) & 255)
  59 #define palette_write(v)        *(unsigned long *)(IO_START+0x00400000) = 0x00000000|((v) & 0x00ffffff)
  60
  61 /*
  62  * params_phys is a linker defined symbol - see
  63  * arch/arm/boot/compressed/Makefile
  64  */
  65 extern __attribute__((pure)) struct param_struct *params(void);
  66 #define params (params())
  67
  68 #ifndef STANDALONE_DEBUG
  69 unsigned long video_num_cols;
  70 unsigned long video_num_rows;
  71 unsigned long video_x;
  72 unsigned long video_y;
  73 unsigned char bytes_per_char_v;
  74 int white;
  75
  76 /*
  77  * This does not append a newline
  78  */
  79 static inline void putc(int c)
  80 {
  81         extern void ll_write_char(char *, char c, char white);
  82         int x,y;
  83         char *ptr;
  84
  85         x = video_x;
  86         y = video_y;
  87
  88         if (c == '\n') {
  89                 if (++y >= video_num_rows)
  90                         y--;
  91         } else if (c == '\r') {
  92                 x = 0;
  93         } else {
  94                 ptr = VIDMEM + ((y*video_num_cols*bytes_per_char_v+x)*bytes_per_char_h);
  95                 ll_write_char(ptr, c, white);
  96                 if (++x >= video_num_cols) {
  97                         x = 0;
  98                         if ( ++y >= video_num_rows ) {
  99                                 y--;
 100                         }
 101                 }
 102         }
 103
 104         video_x = x;
 105         video_y = y;
 106 }
 107
 108 static inline void flush(void)
 109 {
 110 }
 111
 112 /*
 113  * Setup for decompression
 114  */
 115 static void arch_decomp_setup(void)
 116 {
 117         int i;
 118         struct tag *t = (struct tag *)params;
 119         unsigned int nr_pages = 0, page_size = PAGE_SIZE;
 120
 121         if (t->hdr.tag == ATAG_CORE)
 122         {
 123                 for (; t->hdr.size; t = tag_next(t))
 124                 {
 125                         if (t->hdr.tag == ATAG_VIDEOTEXT)
 126                         {
 127                                 video_num_rows = t->u.videotext.video_lines;
 128                                 video_num_cols = t->u.videotext.video_cols;
 129                                 bytes_per_char_h = t->u.videotext.video_points;
 130                                 bytes_per_char_v = t->u.videotext.video_points;
 131                                 video_x = t->u.videotext.x;
 132                                 video_y = t->u.videotext.y;
 133                         }
 134
 135                         if (t->hdr.tag == ATAG_MEM)
 136                         {
 137                                 page_size = PAGE_SIZE;
 138                                 nr_pages += (t->u.mem.size / PAGE_SIZE);
 139                         }
 140                 }
 141         }
 142         else
 143         {
 144                 nr_pages = params->nr_pages;
 145                 page_size = params->page_size;
 146                 video_num_rows = params->video_num_rows;
 147                 video_num_cols = params->video_num_cols;
 148                 video_x = params->video_x;
 149                 video_y = params->video_y;
 150                 bytes_per_char_h = params->bytes_per_char_h;
 151                 bytes_per_char_v = params->bytes_per_char_v;
 152         }
 153
 154         video_size_row = video_num_cols * bytes_per_char_h;
 155
 156         if (bytes_per_char_h == 4)
 157                 for (i = 0; i < 256; i++)
 158                         con_charconvtable[i] =
 159                                 (i & 128 ? 1 << 0  : 0) |
 160                                 (i & 64  ? 1 << 4  : 0) |
 161                                 (i & 32  ? 1 << 8  : 0) |
 162                                 (i & 16  ? 1 << 12 : 0) |
 163                                 (i & 8   ? 1 << 16 : 0) |
 164                                 (i & 4   ? 1 << 20 : 0) |
 165                                 (i & 2   ? 1 << 24 : 0) |
 166                                 (i & 1   ? 1 << 28 : 0);
 167         else
 168                 for (i = 0; i < 16; i++)
 169                         con_charconvtable[i] =
 170                                 (i & 8   ? 1 << 0  : 0) |
 171                                 (i & 4   ? 1 << 8  : 0) |
 172                                 (i & 2   ? 1 << 16 : 0) |
 173                                 (i & 1   ? 1 << 24 : 0);
 174
 175
 176         palette_setpixel(0);
 177         if (bytes_per_char_h == 1) {
 178                 palette_write (0);
 179                 palette_write (0x00ffffff);
 180                 for (i = 2; i < 256; i++)
 181                         palette_write (0);
 182                 white = 1;
 183         } else {
 184                 for (i = 0; i < 256; i++)
 185                         palette_write (i < 16 ? palette_4[i] : 0);
 186                 white = 7;
 187         }
 188
 189         if (nr_pages * page_size < 4096*1024) error("<4M of mem\n");
 190 }
 191 #endif