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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp.h>
/*
* If the BSP variant does not have UBoot, then disable all contents
* of this file.
*/
#if defined(HAS_UBOOT)
#include <stdint.h>
#include <string.h>
/* Assumed to be provided by BSP */
extern const uint8_t *uboot_environment;
extern const size_t uboot_environment_size;
/*
* The U-Boot source code appears to use the CRC32 code from zlib.
* But I cannot find a way to get the crc32() in zlib code to
* generate the CRC found in the Flash on the Icecube board.
* So for now, always return TRUE.
*/
static int bsp_uboot_environ_check_crc(void)
{
#if 0
unsigned long crc;
unsigned long max;
for (max=0 ; max <= 0x20000 ; max+=4 ) {
crc = crc32( 0, NULL, 0 );
crc = crc32( crc, &uboot_environment[4], max);
printk( "crc=0x%08lx need %0x max=%d\n", crc,
*(int *)uboot_environment, max );
}
#endif
return 1;
}
const char *bsp_uboot_getenv(
const char *name
)
{
char lhs[64];
size_t i, j;
if ( !bsp_uboot_environ_check_crc() )
return NULL;
for ( i=4 ; i<uboot_environment_size ; i++ ) {
memset( lhs, '\0', sizeof(lhs) );
for( j=0 ; uboot_environment[i] != '=' && j<sizeof(lhs) ; i++, j++ ) {
lhs[j] = uboot_environment[i];
}
if ( !strncmp( name, lhs, sizeof(lhs) ) ) {
return (const char *)&uboot_environment[i+1];
}
for ( i++ ; uboot_environment[i] && i<uboot_environment_size ; i++ )
;
if ( !uboot_environment[i+1] )
return NULL;
}
return NULL;
}
#endif /* defined(HAS_UBOOT) */
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