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
17int video_size_row;
18unsigned char bytes_per_char_h;
19extern unsigned long con_charconvtable[256];
20
21struct 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
39static 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 */
65extern __attribute__((pure)) struct param_struct *params(void);
66#define params (params())
67
68#ifndef STANDALONE_DEBUG
69unsigned long video_num_cols;
70unsigned long video_num_rows;
71unsigned long video_x;
72unsigned long video_y;
73unsigned char bytes_per_char_v;
74int white;
75
76/*
77 * This does not append a newline
78 */
79static 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
108static inline void flush(void)
109{
110}
111
112/*
113 * Setup for decompression
114 */
115static 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