mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 14:16:17 +09:00
1f1d88dd40
It isn't generally save to execute applications outside of U-Boot with caches enabled due to the way the Blackfin processor handles caches (requires software assistance). This patch disables caches before booting an ELF or just booting raw code. The previous discussion on the patch was that we wanted to use weaks instead, but that proved to not be feasible when multiple symbols are involved, which puts us back at the ifdef solution. I've minimized the ugliness by moving the setup step outside of the main function. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Misc boot support
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*/
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#include <common.h>
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#include <command.h>
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#include <net.h>
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#if defined(CONFIG_I386)
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DECLARE_GLOBAL_DATA_PTR;
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#endif
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static inline void go_setup(int argc, char *argv[])
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{
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#if defined(CONFIG_I386)
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/*
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* x86 does not use a dedicated register to pass the pointer
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* to the global_data
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*/
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argv[0] = (char *)gd;
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#elif defined(CONFIG_BLACKFIN)
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if (dcache_status ())
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dcache_disable ();
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if (icache_status ())
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icache_disable ();
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#endif
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}
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int do_go (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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ulong addr, rc;
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int rcode = 0;
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if (argc < 2) {
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printf ("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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addr = simple_strtoul(argv[1], NULL, 16);
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printf ("## Starting application at 0x%08lX ...\n", addr);
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go_setup(argc, argv);
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#if defined(CONFIG_NIOS)
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/*
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* Nios function pointers are address >> 1
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*/
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addr >>= 1;
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#endif
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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) 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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U_BOOT_CMD(
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go, CFG_MAXARGS, 1, do_go,
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"go - start application at address 'addr'\n",
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"addr [arg ...]\n - start application at address 'addr'\n"
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" passing 'arg' as arguments\n"
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);
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extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
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U_BOOT_CMD(
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reset, 1, 0, do_reset,
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"reset - Perform RESET of the CPU\n",
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NULL
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);
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