image.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#ifndef USE_HOSTCC
#include <common.h>
#include <watchdog.h>

#ifdef CONFIG_SHOW_BOOT_PROGRESS
#include <status_led.h>
#endif

#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>
#endif

#ifdef CONFIG_LOGBUFFER
#include <logbuff.h>
#endif

#if defined(CONFIG_TIMESTAMP) || defined(CONFIG_CMD_DATE)
#include <rtc.h>
#endif

#include <image.h>

#if defined(CONFIG_FIT) || defined (CONFIG_OF_LIBFDT)
#include <fdt.h>
#include <libfdt.h>
#include <fdt_support.h>
#endif

#if defined(CONFIG_FIT)
#include <u-boot/md5.h>
#include <sha1.h>

static int fit_check_ramdisk (const void *fit, int os_noffset,
		uint8_t arch, int verify);
#endif

#ifdef CONFIG_CMD_BDI
extern int do_bdinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
#endif

DECLARE_GLOBAL_DATA_PTR;

static image_header_t* image_get_ramdisk (ulong rd_addr, uint8_t arch,
						int verify);
#else
#include "mkimage.h"
#include <u-boot/md5.h>
#include <time.h>
#include <image.h>
#endif /* !USE_HOSTCC*/

typedef struct table_entry {
	int	id;		/* as defined in image.h	*/
	char	*sname;		/* short (input) name		*/
	char	*lname;		/* long (output) name		*/
} table_entry_t;

static table_entry_t uimage_arch[] = {
	{	IH_ARCH_INVALID,	NULL,		"Invalid ARCH",	},
	{	IH_ARCH_ALPHA,		"alpha",	"Alpha",	},
	{	IH_ARCH_ARM,		"arm",		"ARM",		},
	{	IH_ARCH_I386,		"x86",		"Intel x86",	},
	{	IH_ARCH_IA64,		"ia64",		"IA64",		},
	{	IH_ARCH_M68K,		"m68k",		"M68K",		},
	{	IH_ARCH_MICROBLAZE,	"microblaze",	"MicroBlaze",	},
	{	IH_ARCH_MIPS,		"mips",		"MIPS",		},
	{	IH_ARCH_MIPS64,		"mips64",	"MIPS 64 Bit",	},
	{	IH_ARCH_NIOS,		"nios",		"NIOS",		},
	{	IH_ARCH_NIOS2,		"nios2",	"NIOS II",	},
	{	IH_ARCH_PPC,		"powerpc",	"PowerPC",	},
	{	IH_ARCH_PPC,		"ppc",		"PowerPC",	},
	{	IH_ARCH_S390,		"s390",		"IBM S390",	},
	{	IH_ARCH_SH,		"sh",		"SuperH",	},
	{	IH_ARCH_SPARC,		"sparc",	"SPARC",	},
	{	IH_ARCH_SPARC64,	"sparc64",	"SPARC 64 Bit",	},
	{	IH_ARCH_BLACKFIN,	"blackfin",	"Blackfin",	},
	{	IH_ARCH_AVR32,		"avr32",	"AVR32",	},
	{	-1,			"",		"",		},
};

static table_entry_t uimage_os[] = {
	{	IH_OS_INVALID,	NULL,		"Invalid OS",		},
#if defined(CONFIG_ARTOS) || defined(USE_HOSTCC)
	{	IH_OS_ARTOS,	"artos",	"ARTOS",		},
#endif
	{	IH_OS_LINUX,	"linux",	"Linux",		},
#if defined(CONFIG_LYNXKDI) || defined(USE_HOSTCC)
	{	IH_OS_LYNXOS,	"lynxos",	"LynxOS",		},
#endif
	{	IH_OS_NETBSD,	"netbsd",	"NetBSD",		},
	{	IH_OS_RTEMS,	"rtems",	"RTEMS",		},
	{	IH_OS_U_BOOT,	"u-boot",	"U-Boot",		},
#if defined(CONFIG_CMD_ELF) || defined(USE_HOSTCC)
	{	IH_OS_QNX,	"qnx",		"QNX",			},
	{	IH_OS_VXWORKS,	"vxworks",	"VxWorks",		},
#endif
#ifdef USE_HOSTCC
	{	IH_OS_4_4BSD,	"4_4bsd",	"4_4BSD",		},
	{	IH_OS_DELL,	"dell",		"Dell",			},
	{	IH_OS_ESIX,	"esix",		"Esix",			},
	{	IH_OS_FREEBSD,	"freebsd",	"FreeBSD",		},
	{	IH_OS_IRIX,	"irix",		"Irix",			},
	{	IH_OS_NCR,	"ncr",		"NCR",			},
	{	IH_OS_OPENBSD,	"openbsd",	"OpenBSD",		},
	{	IH_OS_PSOS,	"psos",		"pSOS",			},
	{	IH_OS_SCO,	"sco",		"SCO",			},
	{	IH_OS_SOLARIS,	"solaris",	"Solaris",		},
	{	IH_OS_SVR4,	"svr4",		"SVR4",			},
#endif
	{	-1,		"",		"",			},
};

static table_entry_t uimage_type[] = {
	{	IH_TYPE_INVALID,    NULL,	  "Invalid Image",	},
	{	IH_TYPE_FILESYSTEM, "filesystem", "Filesystem Image",	},
	{	IH_TYPE_FIRMWARE,   "firmware",	  "Firmware",		},
	{	IH_TYPE_KERNEL,	    "kernel",	  "Kernel Image",	},
	{	IH_TYPE_MULTI,	    "multi",	  "Multi-File Image",	},
	{	IH_TYPE_RAMDISK,    "ramdisk",	  "RAMDisk Image",	},
	{	IH_TYPE_SCRIPT,     "script",	  "Script",		},
	{	IH_TYPE_STANDALONE, "standalone", "Standalone Program", },
	{	IH_TYPE_FLATDT,     "flat_dt",    "Flat Device Tree",	},
	{	-1,		    "",		  "",			},
};

static table_entry_t uimage_comp[] = {
	{	IH_COMP_NONE,	"none",		"uncompressed",		},
	{	IH_COMP_BZIP2,	"bzip2",	"bzip2 compressed",	},
	{	IH_COMP_GZIP,	"gzip",		"gzip compressed",	},
	{	-1,		"",		"",			},
};

uint32_t crc32 (uint32_t, const unsigned char *, uint);
uint32_t crc32_wd (uint32_t, const unsigned char *, uint, uint);
static void genimg_print_size (uint32_t size);
#if defined(CONFIG_TIMESTAMP) || defined(CONFIG_CMD_DATE) || defined(USE_HOSTCC)
static void genimg_print_time (time_t timestamp);
#endif

/*****************************************************************************/
/* Legacy format routines */
/*****************************************************************************/
int image_check_hcrc (image_header_t *hdr)
{
	ulong hcrc;
	ulong len = image_get_header_size ();
	image_header_t header;

	/* Copy header so we can blank CRC field for re-calculation */
	memmove (&header, (char *)hdr, image_get_header_size ());
	image_set_hcrc (&header, 0);

	hcrc = crc32 (0, (unsigned char *)&header, len);

	return (hcrc == image_get_hcrc (hdr));
}

int image_check_dcrc (image_header_t *hdr)
{
	ulong data = image_get_data (hdr);
	ulong len = image_get_data_size (hdr);
	ulong dcrc = crc32_wd (0, (unsigned char *)data, len, CHUNKSZ_CRC32);

	return (dcrc == image_get_dcrc (hdr));
}

/**
 * image_multi_count - get component (sub-image) count
 * @hdr: pointer to the header of the multi component image
 *
 * image_multi_count() returns number of components in a multi
 * component image.
 *
 * Note: no checking of the image type is done, caller must pass
 * a valid multi component image.
 *
 * returns:
 *     number of components
 */
ulong image_multi_count (image_header_t *hdr)
{
	ulong i, count = 0;
	uint32_t *size;

	/* get start of the image payload, which in case of multi
	 * component images that points to a table of component sizes */
	size = (uint32_t *)image_get_data (hdr);

	/* count non empty slots */
	for (i = 0; size[i]; ++i)
		count++;

	return count;
}

/**
 * image_multi_getimg - get component data address and size
 * @hdr: pointer to the header of the multi component image
 * @idx: index of the requested component
 * @data: pointer to a ulong variable, will hold component data address
 * @len: pointer to a ulong variable, will hold component size
 *
 * image_multi_getimg() returns size and data address for the requested
 * component in a multi component image.
 *
 * Note: no checking of the image type is done, caller must pass
 * a valid multi component image.
 *
 * returns:
 *     data address and size of the component, if idx is valid
 *     0 in data and len, if idx is out of range
 */
void image_multi_getimg (image_header_t *hdr, ulong idx,
			ulong *data, ulong *len)
{
	int i;
	uint32_t *size;
	ulong offset, count, img_data;

	/* get number of component */
	count = image_multi_count (hdr);

	/* get start of the image payload, which in case of multi
	 * component images that points to a table of component sizes */
	size = (uint32_t *)image_get_data (hdr);

	/* get address of the proper component data start, which means
	 * skipping sizes table (add 1 for last, null entry) */
	img_data = image_get_data (hdr) + (count + 1) * sizeof (uint32_t);

	if (idx < count) {
		*len = uimage_to_cpu (size[idx]);
		offset = 0;

		/* go over all indices preceding requested component idx */
		for (i = 0; i < idx; i++) {
			/* add up i-th component size, rounding up to 4 bytes */
			offset += (uimage_to_cpu (size[i]) + 3) & ~3 ;
		}

		/* calculate idx-th component data address */
		*data = img_data + offset;
	} else {
		*len = 0;
		*data = 0;
	}
}

static void image_print_type (image_header_t *hdr)
{
	const char *os, *arch, *type, *comp;

	os = genimg_get_os_name (image_get_os (hdr));
	arch = genimg_get_arch_name (image_get_arch (hdr));
	type = genimg_get_type_name (image_get_type (hdr));
	comp = genimg_get_comp_name (image_get_comp (hdr));

	printf ("%s %s %s (%s)\n", arch, os, type, comp);
}

/**
 * image_print_contents - prints out the contents of the legacy format image
 * @hdr: pointer to the legacy format image header
 * @p: pointer to prefix string
 *
 * image_print_contents() formats a multi line legacy image contents description.
 * The routine prints out all header fields followed by the size/offset data
 * for MULTI/SCRIPT images.
 *
 * returns:
 *     no returned results
 */
void image_print_contents (image_header_t *hdr)
{
	const char *p;

#ifdef USE_HOSTCC
	p = "";
#else
	p = "   ";
#endif

	printf ("%sImage Name:   %.*s\n", p, IH_NMLEN, image_get_name (hdr));
#if defined(CONFIG_TIMESTAMP) || defined(CONFIG_CMD_DATE) || defined(USE_HOSTCC)
	printf ("%sCreated:      ", p);
	genimg_print_time ((time_t)image_get_time (hdr));
#endif
	printf ("%sImage Type:   ", p);
	image_print_type (hdr);
	printf ("%sData Size:    ", p);
	genimg_print_size (image_get_data_size (hdr));
	printf ("%sLoad Address: %08x\n", p, image_get_load (hdr));
	printf ("%sEntry Point:  %08x\n", p, image_get_ep (hdr));

	if (image_check_type (hdr, IH_TYPE_MULTI) ||
			image_check_type (hdr, IH_TYPE_SCRIPT)) {
		int i;
		ulong data, len;
		ulong count = image_multi_count (hdr);

		printf ("%sContents:\n", p);
		for (i = 0; i < count; i++) {
			image_multi_getimg (hdr, i, &data, &len);

			printf ("%s   Image %d: ", p, i);
			genimg_print_size (len);

			if (image_check_type (hdr, IH_TYPE_SCRIPT) && i > 0) {
				/*
				 * the user may need to know offsets
				 * if planning to do something with
				 * multiple files
				 */
				printf ("%s    Offset = 0x%08lx\n", p, data);
			}
		}
	}
}


#ifndef USE_HOSTCC
/**
 * image_get_ramdisk - get and verify ramdisk image
 * @rd_addr: ramdisk image start address
 * @arch: expected ramdisk architecture
 * @verify: checksum verification flag
 *
 * image_get_ramdisk() returns a pointer to the verified ramdisk image
 * header. Routine receives image start address and expected architecture
 * flag. Verification done covers data and header integrity and os/type/arch
 * fields checking.
 *
 * If dataflash support is enabled routine checks for dataflash addresses
 * and handles required dataflash reads.
 *
 * returns:
 *     pointer to a ramdisk image header, if image was found and valid
 *     otherwise, return NULL
 */
static image_header_t* image_get_ramdisk (ulong rd_addr, uint8_t arch,
						int verify)
{
	image_header_t *rd_hdr = (image_header_t *)rd_addr;

	if (!image_check_magic (rd_hdr)) {
		puts ("Bad Magic Number\n");
		show_boot_progress (-10);
		return NULL;
	}

	if (!image_check_hcrc (rd_hdr)) {
		puts ("Bad Header Checksum\n");
		show_boot_progress (-11);
		return NULL;
	}

	show_boot_progress (10);
	image_print_contents (rd_hdr);

	if (verify) {
		puts("   Verifying Checksum ... ");
		if (!image_check_dcrc (rd_hdr)) {
			puts ("Bad Data CRC\n");
			show_boot_progress (-12);
			return NULL;
		}
		puts("OK\n");
	}

	show_boot_progress (11);

	if (!image_check_os (rd_hdr, IH_OS_LINUX) ||
	    !image_check_arch (rd_hdr, arch) ||
	    !image_check_type (rd_hdr, IH_TYPE_RAMDISK)) {
		printf ("No Linux %s Ramdisk Image\n",
				genimg_get_arch_name(arch));
		show_boot_progress (-13);
		return NULL;
	}

	return rd_hdr;
}
#endif /* !USE_HOSTCC */

/*****************************************************************************/
/* Shared dual-format routines */
/*****************************************************************************/
#ifndef USE_HOSTCC
int getenv_yesno (char *var)
{
	char *s = getenv (var);
	return (s && (*s == 'n')) ? 0 : 1;
}

ulong getenv_bootm_low(void)
{
	char *s = getenv ("bootm_low");
	if (s) {
		ulong tmp = simple_strtoul (s, NULL, 16);
		return tmp;
	}

#if defined(CFG_SDRAM_BASE)
	return CFG_SDRAM_BASE;
#elif defined(CONFIG_ARM)
	return gd->bd->bi_dram[0].start;
#else
	return 0;
#endif
}

phys_size_t getenv_bootm_size(void)
{
	char *s = getenv ("bootm_size");
	if (s) {
		phys_size_t tmp;
#ifdef CFG_64BIT_STRTOUL
		tmp = (phys_size_t)simple_strtoull (s, NULL, 16);
#else
		tmp = (phys_size_t)simple_strtoul (s, NULL, 16);
#endif
		return tmp;
	}

#if defined(CONFIG_ARM)
	return gd->bd->bi_dram[0].size;
#else
	return gd->bd->bi_memsize;
#endif
}

void memmove_wd (void *to, void *from, size_t len, ulong chunksz)
{
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
	while (len > 0) {
		size_t tail = (len > chunksz) ? chunksz : len;
		WATCHDOG_RESET ();
		memmove (to, from, tail);
		to += tail;
		from += tail;
		len -= tail;
	}
#else	/* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
	memmove (to, from, len);
#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
}
#endif /* !USE_HOSTCC */