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 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 192