109 lines
4.2 KiB
C
Executable File
109 lines
4.2 KiB
C
Executable File
/*
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* (C) Copyright 2007-2013
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Jerry Wang <wangflord@allwinnertech.com>
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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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#include <common.h>
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#include <private_uboot.h>
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extern char uboot_hash_value[64];
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#pragma pack(1)
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struct spare_boot_head_t uboot_spare_head =
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{
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{
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/* jump_instruction */
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( 0xEA000000 | ( ( ( sizeof( struct spare_boot_head_t ) + sizeof(uboot_hash_value) + sizeof( int ) - 1 ) / sizeof( int ) - 2 ) & 0x00FFFFFF ) ),
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UBOOT_MAGIC,
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STAMP_VALUE,
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ALIGN_SIZE,
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0,
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0,
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UBOOT_VERSION,
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UBOOT_PLATFORM,
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{CONFIG_SYS_TEXT_BASE}
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},
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{
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{ 0 }, //dram para
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1008, //run core clock
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1200, //run core vol
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0, //uart port
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{ //uart gpio
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{0}, {0}
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},
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0, //twi port
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{ //twi gpio
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{0}, {0}
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},
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0, //work mode
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0, //storage mode
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{ {0} }, //nand gpio
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{ 0 }, //nand spare data
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{ {0} }, //sdcard gpio
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{ 0 }, //sdcard spare data
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0, //secure os
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0, //monitor
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{0}, // res
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UBOOT_START_SECTOR_IN_SDMMC, //OTA flag
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0, //dtb offset
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0, //boot_package_size
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0, //dram_scan_size
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{ 0 } //reserved data
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}
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};
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#pragma pack()
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/*******************************************************************************
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*
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* 关于Boot_file_head中的jump_instruction字段
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*
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* jump_instruction字段存放的是一条跳转指令：( B BACK_OF_Boot_file_head )，此跳
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*转指令被执行后，程序将跳转到Boot_file_head后面第一条指令。
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*
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* ARM指令中的B指令编码如下：
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* +--------+---------+------------------------------+
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* | 31--28 | 27--24 | 23--0 |
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* +--------+---------+------------------------------+
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* | cond | 1 0 1 0 | signed_immed_24 |
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* +--------+---------+------------------------------+
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* 《ARM Architecture Reference Manual》对于此指令有如下解释：
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* Syntax :
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* B{<cond>} <target_address>
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* <cond> Is the condition under which the instruction is executed. If the
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* <cond> is ommitted, the AL(always,its code is 0b1110 )is used.
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* <target_address>
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* Specified the address to branch to. The branch target address is
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* calculated by:
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* 1. Sign-extending the 24-bit signed(wro's complement)immediate
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* to 32 bits.
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* 2. Shifting the result left two bits.
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* 3. Adding to the contents of the PC, which contains the address
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* of the branch instruction plus 8.
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*
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* 由此可知，此指令编码的最高8位为：0b11101010，低24位根据Boot_file_head的大小动
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*态生成，所以指令的组装过程如下：
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* ( sizeof( boot_file_head_t ) + sizeof( int ) - 1 ) / sizeof( int ) 求出文件头
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* 占用的“字”的个数
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* - 2 减去PC预取的指令条数
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* & 0x00FFFFFF 求出signed-immed-24
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* | 0xEA000000 组装成B指令
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*
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*******************************************************************************/
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