332 lines
9.1 KiB
C
332 lines
9.1 KiB
C
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/*
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* Copyright (c) 2001 William L. Pitts
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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#include <common.h>
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#include <command.h>
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#include <linux/ctype.h>
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#include <net.h>
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#include <elf.h>
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#if (CONFIG_COMMANDS & CFG_CMD_ELF)
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#ifndef MAX
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#endif
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int valid_elf_image (unsigned long addr);
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unsigned long load_elf_image (unsigned long addr);
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/* ======================================================================
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* Interpreter command to boot an arbitrary ELF image from memory.
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* ====================================================================== */
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int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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unsigned long addr; /* Address of the ELF image */
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unsigned long rc; /* Return value from user code */
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/* -------------------------------------------------- */
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int rcode = 0;
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if (argc < 2)
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addr = load_addr;
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else
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addr = simple_strtoul (argv[1], NULL, 16);
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if (!valid_elf_image (addr))
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return 1;
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addr = load_elf_image (addr);
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printf ("## Starting application at 0x%08lx ...\n", addr);
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/*
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* QNX images require the data cache is disabled.
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* Data cache is already flushed, so just turn it off.
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*/
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if (dcache_status ())
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dcache_disable ();
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/*
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* pass address parameter as argv[0] (aka command name),
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* and all remaining args
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*/
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rc = ((ulong (*)(int, char *[])) addr) (--argc, &argv[1]);
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if (rc != 0)
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rcode = 1;
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printf ("## Application terminated, rc = 0x%lx\n", rc);
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return rcode;
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}
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/* ======================================================================
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* Interpreter command to boot VxWorks from a memory image. The image can
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* be either an ELF image or a raw binary. Will attempt to setup the
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* bootline and other parameters correctly.
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* ====================================================================== */
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int do_bootvx ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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#if defined(CONFIG_WALNUT) || \
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defined(CFG_VXWORKS_MAC_PTR)
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DECLARE_GLOBAL_DATA_PTR;
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#endif
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unsigned long addr; /* Address of image */
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unsigned long bootaddr; /* Address to put the bootline */
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char *bootline; /* Text of the bootline */
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char *tmp; /* Temporary char pointer */
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#if defined(CONFIG_4xx) || defined(CONFIG_IOP480)
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char build_buf[80]; /* Buffer for building the bootline */
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#endif
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/* -------------------------------------------------- */
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/*
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* Check the loadaddr variable.
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* If we don't know where the image is then we're done.
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*/
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if ((tmp = getenv ("loadaddr")) != NULL) {
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addr = simple_strtoul (tmp, NULL, 16);
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} else {
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puts ("No load address provided\n");
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return 1;
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}
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#if (CONFIG_COMMANDS & CFG_CMD_NET)
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/* Check to see if we need to tftp the image ourselves before starting */
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if ((argc == 2) && (strcmp (argv[1], "tftp") == 0)) {
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if (NetLoop (TFTP) <= 0)
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return 1;
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printf ("Automatic boot of VxWorks image at address 0x%08lx ... \n", addr);
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}
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#endif
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/* This should equate
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* to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
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* from the VxWorks BSP header files.
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* This will vary from board to board
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*/
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#if defined(CONFIG_WALNUT)
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tmp = (char *) CFG_NVRAM_BASE_ADDR + 0x500;
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memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[3], 3);
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#elif defined(CFG_VXWORKS_MAC_PTR)
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tmp = (char *) CFG_VXWORKS_MAC_PTR;
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memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6);
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#else
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puts ("## Ethernet MAC address not copied to NV RAM\n");
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#endif
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/*
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* Use bootaddr to find the location in memory that VxWorks
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* will look for the bootline string. The default value for
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* PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
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* defaults to 0x4200
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*/
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if ((tmp = getenv ("bootaddr")) == NULL)
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bootaddr = 0x4200;
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else
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bootaddr = simple_strtoul (tmp, NULL, 16);
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/*
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* Check to see if the bootline is defined in the 'bootargs'
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* parameter. If it is not defined, we may be able to
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* construct the info
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*/
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if ((bootline = getenv ("bootargs")) != NULL) {
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memcpy ((void *) bootaddr, bootline, MAX(strlen(bootline), 255));
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flush_cache (bootaddr, MAX(strlen(bootline), 255));
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} else {
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#if defined(CONFIG_4xx)
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sprintf (build_buf, "ibmEmac(0,0)");
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if ((tmp = getenv ("hostname")) != NULL) {
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sprintf (&build_buf[strlen (build_buf - 1)],
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"host:%s ", tmp);
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} else {
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sprintf (&build_buf[strlen (build_buf - 1)],
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": ");
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}
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if ((tmp = getenv ("ipaddr")) != NULL) {
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sprintf (&build_buf[strlen (build_buf - 1)],
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"e=%s ", tmp);
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}
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memcpy ((void *)bootaddr, build_buf, MAX(strlen(build_buf), 255));
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flush_cache (bootaddr, MAX(strlen(build_buf), 255));
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#elif defined(CONFIG_IOP480)
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sprintf (build_buf, "dc(0,0)");
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if ((tmp = getenv ("hostname")) != NULL) {
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sprintf (&build_buf[strlen (build_buf - 1)],
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"host:%s ", tmp);
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} else {
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sprintf (&build_buf[strlen (build_buf - 1)],
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": ");
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}
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if ((tmp = getenv ("ipaddr")) != NULL) {
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sprintf (&build_buf[strlen (build_buf - 1)],
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"e=%s ", tmp);
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}
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memcpy ((void *) bootaddr, build_buf, MAX(strlen(build_buf), 255));
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flush_cache (bootaddr, MAX(strlen(build_buf), 255));
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#else
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/*
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* I'm not sure what the device should be for other
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* PPC flavors, the hostname and ipaddr should be ok
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* to just copy
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*/
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puts ("No bootargs defined\n");
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return 1;
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#endif
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}
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/*
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* If the data at the load address is an elf image, then
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* treat it like an elf image. Otherwise, assume that it is a
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* binary image
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*/
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if (valid_elf_image (addr)) {
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addr = load_elf_image (addr);
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} else {
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puts ("## Not an ELF image, assuming binary\n");
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/* leave addr as load_addr */
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}
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printf ("## Using bootline (@ 0x%lx): %s\n", bootaddr,
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(char *) bootaddr);
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printf ("## Starting vxWorks at 0x%08lx ...\n", addr);
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((void (*)(void)) addr) ();
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puts ("## vxWorks terminated\n");
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return 1;
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}
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/* ======================================================================
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* Determine if a valid ELF image exists at the given memory location.
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* First looks at the ELF header magic field, the makes sure that it is
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* executable and makes sure that it is for a PowerPC.
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* ====================================================================== */
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int valid_elf_image (unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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/* -------------------------------------------------- */
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ehdr = (Elf32_Ehdr *) addr;
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if (!IS_ELF (*ehdr)) {
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printf ("## No elf image at address 0x%08lx\n", addr);
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return 0;
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}
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if (ehdr->e_type != ET_EXEC) {
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printf ("## Not a 32-bit elf image at address 0x%08lx\n",
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addr);
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return 0;
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}
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#if 0
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if (ehdr->e_machine != EM_PPC) {
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printf ("## Not a PowerPC elf image at address 0x%08lx\n",
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addr);
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return 0;
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}
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#endif
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return 1;
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}
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/* ======================================================================
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* A very simple elf loader, assumes the image is valid, returns the
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* entry point address.
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* ====================================================================== */
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unsigned long load_elf_image (unsigned long addr)
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{
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Elf32_Ehdr *ehdr; /* Elf header structure pointer */
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Elf32_Shdr *shdr; /* Section header structure pointer */
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unsigned char *strtab = 0; /* String table pointer */
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unsigned char *image; /* Binary image pointer */
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int i; /* Loop counter */
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/* -------------------------------------------------- */
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ehdr = (Elf32_Ehdr *) addr;
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/* Find the section header string table for output info */
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shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
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(ehdr->e_shstrndx * sizeof (Elf32_Shdr)));
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if (shdr->sh_type == SHT_STRTAB)
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strtab = (unsigned char *) (addr + shdr->sh_offset);
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/* Load each appropriate section */
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for (i = 0; i < ehdr->e_shnum; ++i) {
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shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
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(i * sizeof (Elf32_Shdr)));
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if (!(shdr->sh_flags & SHF_ALLOC)
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|| shdr->sh_addr == 0 || shdr->sh_size == 0) {
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continue;
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}
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if (strtab) {
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printf ("%sing %s @ 0x%08lx (%ld bytes)\n",
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(shdr->sh_type == SHT_NOBITS) ?
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"Clear" : "Load",
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&strtab[shdr->sh_name],
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(unsigned long) shdr->sh_addr,
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(long) shdr->sh_size);
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}
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if (shdr->sh_type == SHT_NOBITS) {
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memset ((void *)shdr->sh_addr, 0, shdr->sh_size);
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} else {
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image = (unsigned char *) addr + shdr->sh_offset;
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memcpy ((void *) shdr->sh_addr,
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(const void *) image,
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shdr->sh_size);
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}
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flush_cache (shdr->sh_addr, shdr->sh_size);
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}
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return ehdr->e_entry;
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}
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/* ====================================================================== */
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U_BOOT_CMD(
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bootelf, 2, 0, do_bootelf,
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"bootelf - Boot from an ELF image in memory\n",
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" [address] - load address of ELF image.\n"
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);
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U_BOOT_CMD(
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bootvx, 2, 0, do_bootvx,
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"bootvx - Boot vxWorks from an ELF image\n",
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" [address] - load address of vxWorks ELF image.\n"
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);
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#endif /* CFG_CMD_ELF */
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