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   1 /*
   2  *  linux/include/asm-arm/arch-rpc/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 <asm/hardware.h>
  13 #include <asm/io.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 static unsigned long video_num_cols;
  70 static unsigned long video_num_rows;
  71 static unsigned long video_x;
  72 static unsigned long video_y;
  73 static unsigned char bytes_per_char_v;
  74 static int white;
  75
  76 /*
  77  * This does not append a newline
  78  */
  79 static 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 static void error(char *x);
 113
 114 /*
 115  * Setup for decompression
 116  */
 117 static void arch_decomp_setup(void)
 118 {
 119         int i;
 120         struct tag *t = (struct tag *)params;
 121         unsigned int nr_pages = 0, page_size = PAGE_SIZE;
 122
 123         if (t->hdr.tag == ATAG_CORE)
 124         {
 125                 for (; t->hdr.size; t = tag_next(t))
 126                 {
 127                         if (t->hdr.tag == ATAG_VIDEOTEXT)
 128                         {
 129                                 video_num_rows = t->u.videotext.video_lines;
 130                                 video_num_cols = t->u.videotext.video_cols;
 131                                 bytes_per_char_h = t->u.videotext.video_points;
 132                                 bytes_per_char_v = t->u.videotext.video_points;
 133                                 video_x = t->u.videotext.x;
 134                                 video_y = t->u.videotext.y;
 135                         }
 136
 137                         if (t->hdr.tag == ATAG_MEM)
 138                         {
 139                                 page_size = PAGE_SIZE;
 140                                 nr_pages += (t->u.mem.size / PAGE_SIZE);
 141                         }
 142                 }
 143         }
 144         else
 145         {
 146                 nr_pages = params->nr_pages;
 147                 page_size = params->page_size;
 148                 video_num_rows = params->video_num_rows;
 149                 video_num_cols = params->video_num_cols;
 150                 video_x = params->video_x;
 151                 video_y = params->video_y;
 152                 bytes_per_char_h = params->bytes_per_char_h;
 153                 bytes_per_char_v = params->bytes_per_char_v;
 154         }
 155
 156         video_size_row = video_num_cols * bytes_per_char_h;
 157
 158         if (bytes_per_char_h == 4)
 159                 for (i = 0; i < 256; i++)
 160                         con_charconvtable[i] =
 161                                 (i & 128 ? 1 << 0  : 0) |
 162                                 (i & 64  ? 1 << 4  : 0) |
 163                                 (i & 32  ? 1 << 8  : 0) |
 164                                 (i & 16  ? 1 << 12 : 0) |
 165                                 (i & 8   ? 1 << 16 : 0) |
 166                                 (i & 4   ? 1 << 20 : 0) |
 167                                 (i & 2   ? 1 << 24 : 0) |
 168                                 (i & 1   ? 1 << 28 : 0);
 169         else
 170                 for (i = 0; i < 16; i++)
 171                         con_charconvtable[i] =
 172                                 (i & 8   ? 1 << 0  : 0) |
 173                                 (i & 4   ? 1 << 8  : 0) |
 174                                 (i & 2   ? 1 << 16 : 0) |
 175                                 (i & 1   ? 1 << 24 : 0);
 176
 177
 178         palette_setpixel(0);
 179         if (bytes_per_char_h == 1) {
 180                 palette_write (0);
 181                 palette_write (0x00ffffff);
 182                 for (i = 2; i < 256; i++)
 183                         palette_write (0);
 184                 white = 1;
 185         } else {
 186                 for (i = 0; i < 256; i++)
 187                         palette_write (i < 16 ? palette_4[i] : 0);
 188                 white = 7;
 189         }
 190
 191         if (nr_pages * page_size < 4096*1024) error("<4M of mem\n");
 192 }
 193 #endif
 194
 195 /*
 196  * nothing to do
 197  */
 198 #define arch_decomp_wdog()