uncompress.h

  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
 14int video_size_row;
 15unsigned char bytes_per_char_h;
 16extern unsigned long con_charconvtable[256];
 17
 18struct 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
 36static 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 */
 62extern __attribute__((pure)) struct param_struct *params(void);
 63#define params (params())
 64
 65#ifndef STANDALONE_DEBUG 
 66unsigned long video_num_cols;
 67unsigned long video_num_rows;
 68unsigned long video_x;
 69unsigned long video_y;
 70unsigned char bytes_per_char_v;
 71int white;
 72
 73/*
 74 * This does not append a newline
 75 */
 76static 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
105static inline void flush(void)
106{
107}
108
109/*
110 * Setup for decompression
111 */
112static 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