393 lines
9.2 KiB
C
393 lines
9.2 KiB
C
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/* MN10300 Miscellaneous helper routines for kernel decompressor
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*
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* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Modified by David Howells (dhowells@redhat.com)
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* - Derived from arch/x86/boot/compressed/misc_32.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/compiler.h>
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#include <asm/serial-regs.h>
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#include "misc.h"
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#ifndef CONFIG_GDBSTUB_ON_TTYSx
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/* display 'Uncompressing Linux... ' messages on ttyS0 or ttyS1 */
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#if 1 /* ttyS0 */
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#define CYG_DEV_BASE 0xA6FB0000
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#else /* ttyS1 */
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#define CYG_DEV_BASE 0xA6FC0000
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#endif
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#define CYG_DEV_THR (*((volatile __u8*)(CYG_DEV_BASE + 0x00)))
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#define CYG_DEV_MCR (*((volatile __u8*)(CYG_DEV_BASE + 0x10)))
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#define SIO_MCR_DTR 0x01
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#define SIO_MCR_RTS 0x02
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#define CYG_DEV_LSR (*((volatile __u8*)(CYG_DEV_BASE + 0x14)))
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#define SIO_LSR_THRE 0x20 /* transmitter holding register empty */
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#define SIO_LSR_TEMT 0x40 /* transmitter register empty */
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#define CYG_DEV_MSR (*((volatile __u8*)(CYG_DEV_BASE + 0x18)))
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#define SIO_MSR_CTS 0x10 /* clear to send */
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#define SIO_MSR_DSR 0x20 /* data set ready */
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#define LSR_WAIT_FOR(STATE) \
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do { while (!(CYG_DEV_LSR & SIO_LSR_##STATE)) {} } while (0)
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#define FLOWCTL_QUERY(LINE) \
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({ CYG_DEV_MSR & SIO_MSR_##LINE; })
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#define FLOWCTL_WAIT_FOR(LINE) \
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do { while (!(CYG_DEV_MSR & SIO_MSR_##LINE)) {} } while (0)
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#define FLOWCTL_CLEAR(LINE) \
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do { CYG_DEV_MCR &= ~SIO_MCR_##LINE; } while (0)
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#define FLOWCTL_SET(LINE) \
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do { CYG_DEV_MCR |= SIO_MCR_##LINE; } while (0)
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#endif
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/*
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* gzip declarations
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*/
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#define OF(args) args
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#define STATIC static
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#undef memset
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#undef memcpy
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static inline void *memset(const void *s, int c, size_t n)
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{
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int i;
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char *ss = (char *) s;
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for (i = 0; i < n; i++)
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ss[i] = c;
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return (void *)s;
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}
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#define memzero(s, n) memset((s), 0, (n))
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static inline void *memcpy(void *__dest, const void *__src, size_t __n)
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{
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int i;
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const char *s = __src;
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char *d = __dest;
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for (i = 0; i < __n; i++)
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d[i] = s[i];
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return __dest;
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}
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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#define WSIZE 0x8000 /* Window size must be at least 32k, and a power of
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* two */
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static uch *inbuf; /* input buffer */
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static uch window[WSIZE]; /* sliding window buffer */
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static unsigned insize; /* valid bytes in inbuf */
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static unsigned inptr; /* index of next byte to be processed in inbuf */
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static unsigned outcnt; /* bytes in output buffer */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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/* Diagnostic functions */
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#ifdef DEBUG
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# define Assert(cond, msg) { if (!(cond)) error(msg); }
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# define Trace(x) fprintf x
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# define Tracev(x) { if (verbose) fprintf x ; }
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# define Tracevv(x) { if (verbose > 1) fprintf x ; }
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# define Tracec(c, x) { if (verbose && (c)) fprintf x ; }
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# define Tracecv(c, x) { if (verbose > 1 && (c)) fprintf x ; }
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#else
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# define Assert(cond, msg)
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# define Trace(x)
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# define Tracev(x)
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# define Tracevv(x)
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# define Tracec(c, x)
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# define Tracecv(c, x)
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#endif
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static int fill_inbuf(void);
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static void flush_window(void);
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static void error(const char *) __attribute__((noreturn));
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static void kputs(const char *);
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static inline unsigned char get_byte(void)
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{
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unsigned char ch = inptr < insize ? inbuf[inptr++] : fill_inbuf();
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#if 0
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char hex[3];
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hex[0] = ((ch & 0x0f) > 9) ?
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((ch & 0x0f) + 'A' - 0xa) : ((ch & 0x0f) + '0');
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hex[1] = ((ch >> 4) > 9) ?
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((ch >> 4) + 'A' - 0xa) : ((ch >> 4) + '0');
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hex[2] = 0;
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kputs(hex);
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#endif
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return ch;
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}
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/*
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* This is set up by the setup-routine at boot-time
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*/
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#define EXT_MEM_K (*(unsigned short *)0x90002)
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#ifndef STANDARD_MEMORY_BIOS_CALL
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#define ALT_MEM_K (*(unsigned long *) 0x901e0)
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#endif
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#define SCREEN_INFO (*(struct screen_info *)0x90000)
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static long bytes_out;
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static uch *output_data;
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static unsigned long output_ptr;
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static unsigned long free_mem_ptr = (unsigned long) &end;
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static unsigned long free_mem_end_ptr = (unsigned long) &end + 0x90000;
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#define INPLACE_MOVE_ROUTINE 0x1000
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#define LOW_BUFFER_START 0x2000
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#define LOW_BUFFER_END 0x90000
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#define LOW_BUFFER_SIZE (LOW_BUFFER_END - LOW_BUFFER_START)
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#define HEAP_SIZE 0x3000
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static int high_loaded;
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static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
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static char *vidmem = (char *)0xb8000;
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static int lines, cols;
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#include "../../../../lib/inflate.c"
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static inline void scroll(void)
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{
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int i;
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memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
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for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
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vidmem[i] = ' ';
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}
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static inline void kputchar(unsigned char ch)
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{
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#ifdef CONFIG_MN10300_UNIT_ASB2305
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while (SC0STR & SC01STR_TBF)
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continue;
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if (ch == 0x0a) {
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SC0TXB = 0x0d;
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while (SC0STR & SC01STR_TBF)
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continue;
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}
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SC0TXB = ch;
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#else
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while (SC1STR & SC01STR_TBF)
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continue;
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if (ch == 0x0a) {
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SC1TXB = 0x0d;
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while (SC1STR & SC01STR_TBF)
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continue;
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}
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SC1TXB = ch;
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#endif
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}
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static void kputs(const char *s)
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{
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#ifdef CONFIG_DEBUG_DECOMPRESS_KERNEL
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#ifndef CONFIG_GDBSTUB_ON_TTYSx
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char ch;
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FLOWCTL_SET(DTR);
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while (*s) {
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LSR_WAIT_FOR(THRE);
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ch = *s++;
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if (ch == 0x0a) {
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CYG_DEV_THR = 0x0d;
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LSR_WAIT_FOR(THRE);
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}
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CYG_DEV_THR = ch;
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}
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FLOWCTL_CLEAR(DTR);
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#else
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for (; *s; s++)
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kputchar(*s);
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#endif
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#endif /* CONFIG_DEBUG_DECOMPRESS_KERNEL */
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}
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/* ===========================================================================
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* Fill the input buffer. This is called only when the buffer is empty
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* and at least one byte is really needed.
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*/
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static int fill_inbuf()
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{
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if (insize != 0)
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error("ran out of input data\n");
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inbuf = input_data;
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insize = input_len;
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inptr = 1;
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return inbuf[0];
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}
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/* ===========================================================================
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* Write the output window window[0..outcnt-1] and update crc and bytes_out.
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* (Used for the decompressed data only.)
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*/
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static void flush_window_low(void)
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{
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ulg c = crc; /* temporary variable */
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unsigned n;
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uch *in, *out, ch;
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in = window;
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out = &output_data[output_ptr];
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for (n = 0; n < outcnt; n++) {
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ch = *out++ = *in++;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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output_ptr += (ulg)outcnt;
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outcnt = 0;
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}
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static void flush_window_high(void)
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{
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ulg c = crc; /* temporary variable */
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unsigned n;
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uch *in, ch;
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in = window;
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for (n = 0; n < outcnt; n++) {
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ch = *output_data++ = *in++;
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if ((ulg) output_data == LOW_BUFFER_END)
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output_data = high_buffer_start;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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outcnt = 0;
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}
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static void flush_window(void)
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{
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if (high_loaded)
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flush_window_high();
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else
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flush_window_low();
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}
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static void error(const char *x)
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{
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kputs("\n\n");
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kputs(x);
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kputs("\n\n -- System halted");
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while (1)
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/* Halt */;
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}
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#define STACK_SIZE (4096)
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long user_stack[STACK_SIZE];
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struct {
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long *a;
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short b;
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} stack_start = { &user_stack[STACK_SIZE], 0 };
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void setup_normal_output_buffer(void)
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{
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#ifdef STANDARD_MEMORY_BIOS_CALL
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if (EXT_MEM_K < 1024)
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error("Less than 2MB of memory.\n");
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#else
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if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024)
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error("Less than 2MB of memory.\n");
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#endif
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output_data = (char *) 0x100000; /* Points to 1M */
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}
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struct moveparams {
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uch *low_buffer_start;
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int lcount;
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uch *high_buffer_start;
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int hcount;
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};
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void setup_output_buffer_if_we_run_high(struct moveparams *mv)
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{
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high_buffer_start = (uch *)(((ulg) &end) + HEAP_SIZE);
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#ifdef STANDARD_MEMORY_BIOS_CALL
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if (EXT_MEM_K < (3 * 1024))
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error("Less than 4MB of memory.\n");
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#else
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if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3 * 1024))
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error("Less than 4MB of memory.\n");
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#endif
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mv->low_buffer_start = output_data = (char *) LOW_BUFFER_START;
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high_loaded = 1;
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free_mem_end_ptr = (long) high_buffer_start;
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if (0x100000 + LOW_BUFFER_SIZE > (ulg) high_buffer_start) {
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high_buffer_start = (uch *)(0x100000 + LOW_BUFFER_SIZE);
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mv->hcount = 0; /* say: we need not to move high_buffer */
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} else {
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mv->hcount = -1;
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}
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mv->high_buffer_start = high_buffer_start;
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}
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void close_output_buffer_if_we_run_high(struct moveparams *mv)
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{
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mv->lcount = bytes_out;
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if (bytes_out > LOW_BUFFER_SIZE) {
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mv->lcount = LOW_BUFFER_SIZE;
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if (mv->hcount)
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mv->hcount = bytes_out - LOW_BUFFER_SIZE;
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} else {
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mv->hcount = 0;
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}
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}
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#undef DEBUGFLAG
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||
|
|
#ifdef DEBUGFLAG
|
||
|
|
int debugflag;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int decompress_kernel(struct moveparams *mv)
|
||
|
|
{
|
||
|
|
#ifdef DEBUGFLAG
|
||
|
|
while (!debugflag)
|
||
|
|
barrier();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
output_data = (char *) CONFIG_KERNEL_TEXT_ADDRESS;
|
||
|
|
|
||
|
|
makecrc();
|
||
|
|
kputs("Uncompressing Linux... ");
|
||
|
|
gunzip();
|
||
|
|
kputs("Ok, booting the kernel.\n");
|
||
|
|
return 0;
|
||
|
|
}
|