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
182