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https://github.com/brain-hackers/u-boot-brain
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60d7d5a631
Most of the various environment functions create CONFIG_ENV_SIZE buffers on the stack. At least on ARM and PPC which have 4KB stacks, this can overflow the stack if we have large environment sizes. So move all the buffers off the stack to static buffers. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/*
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* (C) Copyright 2000-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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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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* 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
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*
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* It might not be possible in all cases to use 'memcpy()' to copy
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* the environment to NVRAM, as the NVRAM might not be mapped into
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* the memory space. (I.e. this is the case for the BAB750). In those
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* cases it might be possible to access the NVRAM using a different
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* method. For example, the RTC on the BAB750 is accessible in IO
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* space using its address and data registers. To enable usage of
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* NVRAM in those cases I invented the functions 'nvram_read()' and
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* 'nvram_write()', which will be activated upon the configuration
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* #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
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* strongly dependent on the used HW, and must be redefined for each
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* board that wants to use them.
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.h>
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#include <search.h>
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#include <errno.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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extern void *nvram_read(void *dest, const long src, size_t count);
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extern void nvram_write(long dest, const void *src, size_t count);
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env_t *env_ptr;
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#else
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env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
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#endif
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char *env_name_spec = "NVRAM";
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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static char env_buf[CONFIG_ENV_SIZE];
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#endif
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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uchar env_get_char_spec(int index)
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{
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uchar c;
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nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
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return c;
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}
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#endif
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void env_relocate_spec(void)
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{
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char *buf;
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#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
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buf = env_buf;
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nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
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#else
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buf = (void *)CONFIG_ENV_ADDR;
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#endif
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env_import(buf, 1);
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}
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int saveenv(void)
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{
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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env_t *env_new = (env_t *)env_buf;
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#else
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env_t *env_new = (env_t *)CONFIG_ENV_ADDR;
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#endif
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ssize_t len;
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char *res;
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int rcode = 0;
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res = (char *)env_new->data;
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len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
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if (len < 0) {
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error("Cannot export environment: errno = %d\n", errno);
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return 1;
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}
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env_new->crc = crc32(0, env_new->data, ENV_SIZE);
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#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
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nvram_write(CONFIG_ENV_ADDR, env_new, CONFIG_ENV_SIZE);
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#endif
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return rcode;
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}
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/*
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* Initialize Environment use
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*
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* We are still running from ROM, so data use is limited
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*/
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int env_init(void)
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{
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#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
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ulong crc;
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uchar *data = env_buf;
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nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
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nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
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if (crc32(0, data, ENV_SIZE) == crc) {
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gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
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#else
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if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
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gd->env_addr = (ulong)&env_ptr->data;
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#endif
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gd->env_valid = 1;
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} else {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 0;
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}
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return 0;
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}
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