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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* arch/arm/mach-rpc/include/mach/uncompress.h
*
* Copyright (C) 1996 Russell King
*/
#define VIDMEM ((char *)SCREEN_START)
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/setup.h>
#include <asm/page.h>
int video_size_row;
unsigned char bytes_per_char_h;
extern unsigned long con_charconvtable[256];
struct param_struct {
unsigned long page_size;
unsigned long nr_pages;
unsigned long ramdisk_size;
unsigned long mountrootrdonly;
unsigned long rootdev;
unsigned long video_num_cols;
unsigned long video_num_rows;
unsigned long video_x;
unsigned long video_y;
unsigned long memc_control_reg;
unsigned char sounddefault;
unsigned char adfsdrives;
unsigned char bytes_per_char_h;
unsigned char bytes_per_char_v;
unsigned long unused[256/4-11];
};
static const unsigned long palette_4[16] = {
0x00000000,
0x000000cc,
0x0000cc00, /* Green */
0x0000cccc, /* Yellow */
0x00cc0000, /* Blue */
0x00cc00cc, /* Magenta */
0x00cccc00, /* Cyan */
0x00cccccc, /* White */
0x00000000,
0x000000ff,
0x0000ff00,
0x0000ffff,
0x00ff0000,
0x00ff00ff,
0x00ffff00,
0x00ffffff
};
#define palette_setpixel(p) *(unsigned long *)(IO_START+0x00400000) = 0x10000000|((p) & 255)
#define palette_write(v) *(unsigned long *)(IO_START+0x00400000) = 0x00000000|((v) & 0x00ffffff)
/*
* params_phys is a linker defined symbol - see
* arch/arm/boot/compressed/Makefile
*/
extern __attribute__((pure)) struct param_struct *params(void);
#define params (params())
#ifndef STANDALONE_DEBUG
unsigned long video_num_cols;
unsigned long video_num_rows;
unsigned long video_x;
unsigned long video_y;
unsigned char bytes_per_char_v;
int white;
/*
* This does not append a newline
*/
static inline void putc(int c)
{
extern void ll_write_char(char *, char c, char white);
int x,y;
char *ptr;
x = video_x;
y = video_y;
if (c == '\n') {
if (++y >= video_num_rows)
y--;
} else if (c == '\r') {
x = 0;
} else {
ptr = VIDMEM + ((y*video_num_cols*bytes_per_char_v+x)*bytes_per_char_h);
ll_write_char(ptr, c, white);
if (++x >= video_num_cols) {
x = 0;
if ( ++y >= video_num_rows ) {
y--;
}
}
}
video_x = x;
video_y = y;
}
static inline void flush(void)
{
}
/*
* Setup for decompression
*/
static void arch_decomp_setup(void)
{
int i;
struct tag *t = (struct tag *)params;
unsigned int nr_pages = 0, page_size = PAGE_SIZE;
if (t->hdr.tag == ATAG_CORE) {
for (; t->hdr.size; t = tag_next(t)) {
if (t->hdr.tag == ATAG_VIDEOTEXT) {
video_num_rows = t->u.videotext.video_lines;
video_num_cols = t->u.videotext.video_cols;
video_x = t->u.videotext.x;
video_y = t->u.videotext.y;
} else if (t->hdr.tag == ATAG_VIDEOLFB) {
bytes_per_char_h = t->u.videolfb.lfb_depth;
bytes_per_char_v = 8;
} else if (t->hdr.tag == ATAG_MEM) {
page_size = PAGE_SIZE;
nr_pages += (t->u.mem.size / PAGE_SIZE);
}
}
} else {
nr_pages = params->nr_pages;
page_size = params->page_size;
video_num_rows = params->video_num_rows;
video_num_cols = params->video_num_cols;
video_x = params->video_x;
video_y = params->video_y;
bytes_per_char_h = params->bytes_per_char_h;
bytes_per_char_v = params->bytes_per_char_v;
}
video_size_row = video_num_cols * bytes_per_char_h;
if (bytes_per_char_h == 4)
for (i = 0; i < 256; i++)
con_charconvtable[i] =
(i & 128 ? 1 << 0 : 0) |
(i & 64 ? 1 << 4 : 0) |
(i & 32 ? 1 << 8 : 0) |
(i & 16 ? 1 << 12 : 0) |
(i & 8 ? 1 << 16 : 0) |
(i & 4 ? 1 << 20 : 0) |
(i & 2 ? 1 << 24 : 0) |
(i & 1 ? 1 << 28 : 0);
else
for (i = 0; i < 16; i++)
con_charconvtable[i] =
(i & 8 ? 1 << 0 : 0) |
(i & 4 ? 1 << 8 : 0) |
(i & 2 ? 1 << 16 : 0) |
(i & 1 ? 1 << 24 : 0);
palette_setpixel(0);
if (bytes_per_char_h == 1) {
palette_write (0);
palette_write (0x00ffffff);
for (i = 2; i < 256; i++)
palette_write (0);
white = 1;
} else {
for (i = 0; i < 256; i++)
palette_write (i < 16 ? palette_4[i] : 0);
white = 7;
}
if (nr_pages * page_size < 4096*1024) error("<4M of mem\n");
}
#endif
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