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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/mach-rpc/include/mach/uncompress.h
   4  *
   5  *  Copyright (C) 1996 Russell King
   6  */
   7 #define VIDMEM ((char *)SCREEN_START)
   8
   9 #include <linux/io.h>
  10 #include <mach/hardware.h>
  11 #include <asm/setup.h>
  12 #include <asm/page.h>
  13
  14 int video_size_row;
  15 unsigned char bytes_per_char_h;
  16 extern unsigned long con_charconvtable[256];
  17
  18 struct param_struct {
  19         unsigned long page_size;
  20         unsigned long nr_pages;
  21         unsigned long ramdisk_size;
  22         unsigned long mountrootrdonly;
  23         unsigned long rootdev;
  24         unsigned long video_num_cols;
  25         unsigned long video_num_rows;
  26         unsigned long video_x;
  27         unsigned long video_y;
  28         unsigned long memc_control_reg;
  29         unsigned char sounddefault;
  30         unsigned char adfsdrives;
  31         unsigned char bytes_per_char_h;
  32         unsigned char bytes_per_char_v;
  33         unsigned long unused[256/4-11];
  34 };
  35
  36 static const unsigned long palette_4[16] = {
  37         0x00000000,
  38         0x000000cc,
  39         0x0000cc00,             /* Green   */
  40         0x0000cccc,             /* Yellow  */
  41         0x00cc0000,             /* Blue    */
  42         0x00cc00cc,             /* Magenta */
  43         0x00cccc00,             /* Cyan    */
  44         0x00cccccc,             /* White   */
  45         0x00000000,
  46         0x000000ff,
  47         0x0000ff00,
  48         0x0000ffff,
  49         0x00ff0000,
  50         0x00ff00ff,
  51         0x00ffff00,
  52         0x00ffffff
  53 };
  54
  55 #define palette_setpixel(p)     *(unsigned long *)(IO_START+0x00400000) = 0x10000000|((p) & 255)
  56 #define palette_write(v)        *(unsigned long *)(IO_START+0x00400000) = 0x00000000|((v) & 0x00ffffff)
  57
  58 /*
  59  * params_phys is a linker defined symbol - see
  60  * arch/arm/boot/compressed/Makefile
  61  */
  62 extern __attribute__((pure)) struct param_struct *params(void);
  63 #define params (params())
  64
  65 #ifndef STANDALONE_DEBUG
  66 unsigned long video_num_cols;
  67 unsigned long video_num_rows;
  68 unsigned long video_x;
  69 unsigned long video_y;
  70 unsigned char bytes_per_char_v;
  71 int white;
  72
  73 /*
  74  * This does not append a newline
  75  */
  76 static inline void putc(int c)
  77 {
  78         extern void ll_write_char(char *, char c, char white);
  79         int x,y;
  80         char *ptr;
  81
  82         x = video_x;
  83         y = video_y;
  84
  85         if (c == '\n') {
  86                 if (++y >= video_num_rows)
  87                         y--;
  88         } else if (c == '\r') {
  89                 x = 0;
  90         } else {
  91                 ptr = VIDMEM + ((y*video_num_cols*bytes_per_char_v+x)*bytes_per_char_h);
  92                 ll_write_char(ptr, c, white);
  93                 if (++x >= video_num_cols) {
  94                         x = 0;
  95                         if ( ++y >= video_num_rows ) {
  96                                 y--;
  97                         }
  98                 }
  99         }
 100
 101         video_x = x;
 102         video_y = y;
 103 }
 104
 105 static inline void flush(void)
 106 {
 107 }
 108
 109 /*
 110  * Setup for decompression
 111  */
 112 static void arch_decomp_setup(void)
 113 {
 114         int i;
 115         struct tag *t = (struct tag *)params;
 116         unsigned int nr_pages = 0, page_size = PAGE_SIZE;
 117
 118         if (t->hdr.tag == ATAG_CORE) {
 119                 for (; t->hdr.size; t = tag_next(t)) {
 120                         if (t->hdr.tag == ATAG_VIDEOTEXT) {
 121                                 video_num_rows = t->u.videotext.video_lines;
 122                                 video_num_cols = t->u.videotext.video_cols;
 123                                 video_x = t->u.videotext.x;
 124                                 video_y = t->u.videotext.y;
 125                         } else if (t->hdr.tag == ATAG_VIDEOLFB) {
 126                                 bytes_per_char_h = t->u.videolfb.lfb_depth;
 127                                 bytes_per_char_v = 8;
 128                         } else if (t->hdr.tag == ATAG_MEM) {
 129                                 page_size = PAGE_SIZE;
 130                                 nr_pages += (t->u.mem.size / PAGE_SIZE);
 131                         }
 132                 }
 133         } else {
 134                 nr_pages = params->nr_pages;
 135                 page_size = params->page_size;
 136                 video_num_rows = params->video_num_rows;
 137                 video_num_cols = params->video_num_cols;
 138                 video_x = params->video_x;
 139                 video_y = params->video_y;
 140                 bytes_per_char_h = params->bytes_per_char_h;
 141                 bytes_per_char_v = params->bytes_per_char_v;
 142         }
 143
 144         video_size_row = video_num_cols * bytes_per_char_h;
 145
 146         if (bytes_per_char_h == 4)
 147                 for (i = 0; i < 256; i++)
 148                         con_charconvtable[i] =
 149                                 (i & 128 ? 1 << 0  : 0) |
 150                                 (i & 64  ? 1 << 4  : 0) |
 151                                 (i & 32  ? 1 << 8  : 0) |
 152                                 (i & 16  ? 1 << 12 : 0) |
 153                                 (i & 8   ? 1 << 16 : 0) |
 154                                 (i & 4   ? 1 << 20 : 0) |
 155                                 (i & 2   ? 1 << 24 : 0) |
 156                                 (i & 1   ? 1 << 28 : 0);
 157         else
 158                 for (i = 0; i < 16; i++)
 159                         con_charconvtable[i] =
 160                                 (i & 8   ? 1 << 0  : 0) |
 161                                 (i & 4   ? 1 << 8  : 0) |
 162                                 (i & 2   ? 1 << 16 : 0) |
 163                                 (i & 1   ? 1 << 24 : 0);
 164
 165
 166         palette_setpixel(0);
 167         if (bytes_per_char_h == 1) {
 168                 palette_write (0);
 169                 palette_write (0x00ffffff);
 170                 for (i = 2; i < 256; i++)
 171                         palette_write (0);
 172                 white = 1;
 173         } else {
 174                 for (i = 0; i < 256; i++)
 175                         palette_write (i < 16 ? palette_4[i] : 0);
 176                 white = 7;
 177         }
 178
 179         if (nr_pages * page_size < 4096*1024) error("<4M of mem\n");
 180 }
 181 #endif