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
192