2eb1573f01
The non-reentrant versions of the hashtable functions operate on a single shared hashtable. So if two different people try using these funcs for two different purposes, they'll cause problems for the other. Avoid this by converting all existing hashtable consumers over to the reentrant versions and then punting the non-reentrant ones. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/*
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* LowLevel function for DataFlash environment support
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* Author : Gilles Gastaldi (Atmel)
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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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#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 <dataflash.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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env_t *env_ptr = NULL;
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char * env_name_spec = "dataflash";
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extern int read_dataflash(unsigned long addr, unsigned long size,
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char *result);
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extern int write_dataflash(unsigned long addr_dest,
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unsigned long addr_src, unsigned long size);
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extern int AT91F_DataflashInit(void);
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extern uchar default_environment[];
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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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read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t,data),
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1, (char *)&c);
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return (c);
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}
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void env_relocate_spec(void)
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{
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char buf[CONFIG_ENV_SIZE];
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read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
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env_import(buf, 1);
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}
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#ifdef CONFIG_ENV_OFFSET_REDUND
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#error No support for redundant environment on dataflash yet!
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#endif
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int saveenv(void)
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{
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env_t env_new;
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ssize_t len;
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char *res;
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res = (char *)&env_new.data;
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len = hexport_r(&env_htab, '\0', &res, ENV_SIZE);
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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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return write_dataflash(CONFIG_ENV_ADDR,
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(unsigned long)&env_new,
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CONFIG_ENV_SIZE);
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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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* Use a (moderately small) buffer on the stack
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*/
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int env_init(void)
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{
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ulong crc, len, new;
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unsigned off;
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uchar buf[64];
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if (gd->env_valid)
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return 0;
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AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
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/* read old CRC */
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read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
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sizeof(ulong), (char *)&crc);
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new = 0;
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len = ENV_SIZE;
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off = offsetof(env_t,data);
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while (len > 0) {
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int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
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new = crc32 (new, buf, n);
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len -= n;
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off += n;
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}
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if (crc == new) {
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gd->env_addr = offsetof(env_t,data);
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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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