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
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