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