Files

257 lines
6.5 KiB
C
Executable File

/*
**********************************************************************************************************************
*
* the Embedded Secure Bootloader System
*
*
* Copyright(C), 2006-2014, Allwinnertech Co., Ltd.
* All Rights Reserved
*
* File :
*
* By :
*
* Version : V2.00
*
* Date :
*
* Descript:
**********************************************************************************************************************
*/
#include "common.h"
/*
************************************************************************************************************
*
* function
*
* name :
*
* parmeters :
*
* return :
*
* note :
*
*
************************************************************************************************************
*/
__s32 check_magic( void *mem_base, const char *magic )
{
standard_boot_file_head_t *bfh = (standard_boot_file_head_t *)mem_base;
if(!memcmp(magic, (const char *)bfh->magic, strlen(magic)))
{
return 0;
}
return -1;
}
/*
************************************************************************************************************
*
* function
*
* name :
*
* parmeters :
*
* return :
*
* note :
*
*
************************************************************************************************************
*/
__s32 check_sum( void *mem_base, __u32 size )
{
__u32 *buf;
__u32 count;
__u32 src_sum;
__u32 sum;
standard_boot_file_head_t *bfh;
bfh = (standard_boot_file_head_t *)mem_base;
/* 生成校验和 */
src_sum = bfh->check_sum; // 从Boot_file_head中的“check_sum”字段取出校验和
bfh->check_sum = STAMP_VALUE; // 将STAMP_VALUE写入Boot_file_head中的“check_sum”字段
count = size >> 2; // 以 字(4bytes)为单位计数
sum = 0;
buf = (__u32 *)mem_base;
do
{
sum += *buf++; // 依次累加,求得校验和
sum += *buf++; // 依次累加,求得校验和
sum += *buf++; // 依次累加,求得校验和
sum += *buf++; // 依次累加,求得校验和
}while( ( count -= 4 ) > (4-1) );
while( count-- > 0 )
sum += *buf++;
bfh->check_sum = src_sum; // 恢复Boot_file_head中的“check_sum”字段的值
if( sum == src_sum )
return 0; // 校验成功
else
{
return -1; // 校验失败
}
}
/*
************************************************************************************************************
*
* function
*
* name :
*
* parmeters :
*
* return :
*
* note :
*
*
************************************************************************************************************
*/
__s32 gen_check_sum( void *boot_buf )
{
standard_boot_file_head_t *head_p;
__u32 length;
__u32 *buf;
__u32 loop;
__u32 i;
__u32 sum;
head_p = (standard_boot_file_head_t *)boot_buf;
length = head_p->length;
if( ( length & 0x3 ) != 0 ) // must 4-byte-aligned
return -1;
buf = (__u32 *)boot_buf;
head_p->check_sum = STAMP_VALUE; // fill stamp
loop = length >> 2;
/* 计算当前文件内容的“校验和”*/
for( i = 0, sum = 0; i < loop; i++ )
sum += buf[i];
/* write back check sum */
head_p->check_sum = sum;
return 0;
}
/*
************************************************************************************************************
*
* function
*
* name :
*
* parmeters :
*
* return :
*
* note :
*
*
************************************************************************************************************
*/
__s32 gen_check_sum_toc0( void *boot_buf )
{
sbrom_toc0_head_info_t *head_p;
__u32 length;
__u32 *buf;
__u32 loop;
__u32 i;
__u32 sum;
head_p = (sbrom_toc0_head_info_t *)boot_buf;
length = head_p->valid_len;
if( ( length & 0x3 ) != 0 ) // must 4-byte-aligned
return -1;
buf = (__u32 *)boot_buf;
head_p->add_sum = STAMP_VALUE; // fill stamp
loop = length >> 2;
/* 计算当前文件内容的“校验和”*/
for( i = 0, sum = 0; i < loop; i++ )
sum += buf[i];
/* write back check sum */
head_p->add_sum = sum;
return 0;
}
/*
************************************************************************************************************
*
* function
*
* name :
*
* parmeters :
*
* return :
*
* note :
*
*
************************************************************************************************************
*/
uint gen_general_checksum(void *buff, uint length)
{
uint *buf;
uint loop;
uint i;
uint sum = 0;
buf = (__u32 *)buff;
loop = length >> 2;
/* 计算当前文件内容的“校验和”*/
for( i = 0, sum = 0; i < loop; i++ )
sum += buf[i];
return sum;
}
/*
************************************************************************************************************
*
* function
*
* name :
*
* parmeters :
*
* return :
*
* note :
*
*
************************************************************************************************************
*/
uint sunxi_sprite_generate_checksum(void *buffer, uint length, uint src_sum)
{
#ifndef CONFIG_USE_NEON_SIMD
uint *buf;
uint count;
uint sum;
/* 生成校验和 */
count = length >> 2; // 以 字(4bytes)为单位计数
sum = 0;
buf = (__u32 *)buffer;
do
{
sum += *buf++; // 依次累加,求得校验和
sum += *buf++; // 依次累加,求得校验和
sum += *buf++; // 依次累加,求得校验和
sum += *buf++; // 依次累加,求得校验和
}while( ( count -= 4 ) > (4-1) );
while( count-- > 0 )
sum += *buf++;
#else
uint sum;
sum = add_sum_neon(buffer, length);
#endif
sum = sum - src_sum + STAMP_VALUE;
return sum;
}