[net-next-2.6.git] / arch / mips / boot / compressed / decompress.c

/*
 * Misc. bootloader code for many machines.
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: Matt Porter <mporter@mvista.com> Derived from
 * arch/ppc/boot/prep/misc.c
 *
 * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
 * Author: Wu Zhangjin <wuzj@lemote.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/types.h>
#include <linux/kernel.h>

#include <asm/addrspace.h>

/* These two variables specify the free mem region
 * that can be used for temporary malloc area
 */
unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;
char *zimage_start;

/* The linker tells us where the image is. */
extern unsigned char __image_begin, __image_end;

/* debug interfaces  */
extern void puts(const char *s);
extern void puthex(unsigned long long val);

void error(char *x)
{
	puts("\n\n");
	puts(x);
	puts("\n\n -- System halted");

	while (1)
		;	/* Halt */
}

/* activate the code for pre-boot environment */
#define STATIC static

#ifdef CONFIG_KERNEL_GZIP
void *memcpy(void *dest, const void *src, size_t n)
{
	int i;
	const char *s = src;
	char *d = dest;

	for (i = 0; i < n; i++)
		d[i] = s[i];
	return dest;
}
#include "../../../../lib/decompress_inflate.c"
#endif

#ifdef CONFIG_KERNEL_BZIP2
void *memset(void *s, int c, size_t n)
{
	int i;
	char *ss = s;

	for (i = 0; i < n; i++)
		ss[i] = c;
	return s;
}
#include "../../../../lib/decompress_bunzip2.c"
#endif

#ifdef CONFIG_KERNEL_LZMA
#include "../../../../lib/decompress_unlzma.c"
#endif

#ifdef CONFIG_KERNEL_LZO
#include "../../../../lib/decompress_unlzo.c"
#endif

void decompress_kernel(unsigned long boot_heap_start)
{
	int zimage_size;

	/*
	 * We link ourself to an arbitrary low address.  When we run, we
	 * relocate outself to that address.  __image_beign points to
	 * the part of the image where the zImage is. -- Tom
	 */
	zimage_start = (char *)(unsigned long)(&__image_begin);
	zimage_size = (unsigned long)(&__image_end) -
	    (unsigned long)(&__image_begin);

	/*
	 * The zImage and initrd will be between start and _end, so they've
	 * already been moved once.  We're good to go now. -- Tom
	 */
	puts("zimage at:     ");
	puthex((unsigned long)zimage_start);
	puts(" ");
	puthex((unsigned long)(zimage_size + zimage_start));
	puts("\n");

	/* this area are prepared for mallocing when decompressing */
	free_mem_ptr = boot_heap_start;
	free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;

	/* Display standard Linux/MIPS boot prompt for kernel args */
	puts("Uncompressing Linux at load address ");
	puthex(VMLINUX_LOAD_ADDRESS_ULL);
	puts("\n");
	/* Decompress the kernel with according algorithm */
	decompress(zimage_start, zimage_size, 0, 0,
		   (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
	/* FIXME: is there a need to flush cache here? */
	puts("Now, booting the kernel...\n");
}
Commit	Line	Data
1b93b3c3 WZ	1	/*
	2	* Misc. bootloader code for many machines.
	3	*
	4	* Copyright 2001 MontaVista Software Inc.
	5	* Author: Matt Porter <mporter@mvista.com> Derived from
	6	* arch/ppc/boot/prep/misc.c
	7	*
	8	* Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
	9	* Author: Wu Zhangjin <wuzj@lemote.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
	15	*/
	16
	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19
	20	#include <asm/addrspace.h>
	21
	22	/* These two variables specify the free mem region
	23	* that can be used for temporary malloc area
	24	*/
	25	unsigned long free_mem_ptr;
	26	unsigned long free_mem_end_ptr;
	27	char *zimage_start;
	28
	29	/* The linker tells us where the image is. */
	30	extern unsigned char __image_begin, __image_end;
1b93b3c3 WZ	31
	32	/* debug interfaces */
	33	extern void puts(const char *s);
	34	extern void puthex(unsigned long long val);
	35
	36	void error(char *x)
	37	{
	38	puts("\n\n");
	39	puts(x);
	40	puts("\n\n -- System halted");
	41
	42	while (1)
	43	; /* Halt */
	44	}
	45
	46	/* activate the code for pre-boot environment */
	47	#define STATIC static
	48
	49	#ifdef CONFIG_KERNEL_GZIP
	50	void memcpy(void dest, const void *src, size_t n)
	51	{
	52	int i;
	53	const char *s = src;
	54	char *d = dest;
	55
	56	for (i = 0; i < n; i++)
	57	d[i] = s[i];
	58	return dest;
	59	}
	60	#include "../../../../lib/decompress_inflate.c"
	61	#endif
	62
	63	#ifdef CONFIG_KERNEL_BZIP2
	64	void memset(void s, int c, size_t n)
	65	{
	66	int i;
	67	char *ss = s;
	68
	69	for (i = 0; i < n; i++)
	70	ss[i] = c;
	71	return s;
	72	}
	73	#include "../../../../lib/decompress_bunzip2.c"
	74	#endif
	75
	76	#ifdef CONFIG_KERNEL_LZMA
	77	#include "../../../../lib/decompress_unlzma.c"
	78	#endif
	79
fe1d45e0 WZ	80	#ifdef CONFIG_KERNEL_LZO
	81	#include "../../../../lib/decompress_unlzo.c"
	82	#endif
	83
1b93b3c3 WZ	84	void decompress_kernel(unsigned long boot_heap_start)
	85	{
	86	int zimage_size;
	87
	88	/*
	89	* We link ourself to an arbitrary low address. When we run, we
	90	* relocate outself to that address. __image_beign points to
	91	* the part of the image where the zImage is. -- Tom
	92	*/
	93	zimage_start = (char *)(unsigned long)(&__image_begin);
	94	zimage_size = (unsigned long)(&__image_end) -
	95	(unsigned long)(&__image_begin);
	96
	97	/*
	98	* The zImage and initrd will be between start and _end, so they've
	99	* already been moved once. We're good to go now. -- Tom
	100	*/
	101	puts("zimage at: ");
	102	puthex((unsigned long)zimage_start);
	103	puts(" ");
	104	puthex((unsigned long)(zimage_size + zimage_start));
	105	puts("\n");
	106
1b93b3c3 WZ	107	/* this area are prepared for mallocing when decompressing */
	108	free_mem_ptr = boot_heap_start;
	109	free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
	110
	111	/* Display standard Linux/MIPS boot prompt for kernel args */
	112	puts("Uncompressing Linux at load address ");
	113	puthex(VMLINUX_LOAD_ADDRESS_ULL);
	114	puts("\n");
	115	/* Decompress the kernel with according algorithm */
	116	decompress(zimage_start, zimage_size, 0, 0,
	117	(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
	118	/* FIXME: is there a need to flush cache here? */
	119	puts("Now, booting the kernel...\n");
	120	}