95 lines
3.4 KiB
C
95 lines
3.4 KiB
C
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/*
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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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* wangwei <wangwei@allwinnertech.com>
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*/
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#include <common.h>
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#include <private_boot0.h>
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#include <private_toc.h>
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#include <commit_info.h>
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#ifdef CFG_ARCH_RISCV
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#define BROM_FILE_HEAD_SIZE (sizeof(sboot_file_head_t) & 0x00FFFFF)
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#define BROM_FILE_HEAD_BIT_10_1 ((BROM_FILE_HEAD_SIZE & 0x7FE) >> 1)
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#define BROM_FILE_HEAD_BIT_11 ((BROM_FILE_HEAD_SIZE & 0x800) >> 11)
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#define BROM_FILE_HEAD_BIT_19_12 ((BROM_FILE_HEAD_SIZE & 0xFF000) >> 12)
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#define BROM_FILE_HEAD_BIT_20 ((BROM_FILE_HEAD_SIZE & 0x100000) >> 20)
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#define BROM_FILE_HEAD_SIZE_OFFSET ((BROM_FILE_HEAD_BIT_20 << 31) | \
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(BROM_FILE_HEAD_BIT_10_1 << 21) | \
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(BROM_FILE_HEAD_BIT_11 << 20) | \
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(BROM_FILE_HEAD_BIT_19_12 << 12))
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#define JUMP_INSTRUCTION (BROM_FILE_HEAD_SIZE_OFFSET | 0x6f)
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#else
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#define BROM_FILE_HEAD_SIZE_OFFSET (((sizeof(sboot_file_head_t) + sizeof(int) - 1) / sizeof(int) - 2))
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#define JUMP_INSTRUCTION (BROM_FILE_HEAD_SIZE_OFFSET | 0xEA000000)
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#endif
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const sboot_file_head_t sboot_head = {
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/* head */
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{
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JUMP_INSTRUCTION,
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TOC0_MAGIC,
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STAMP_VALUE,
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ALIGN_SIZE,
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sizeof(sboot_file_head_t),
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{
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0, 0, 0, 0
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},
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0,
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CFG_SBOOT_RUN_ADDR,
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0,
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{
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0, 0, '2', '.', '0', '.', '0', 0
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},
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},
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/* hash */
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{CI_INFO},
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#ifdef CFG_SUNXI_SELECT_DRAM_PARA
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.extd_head.magic = DRAM_EXT_MAGIC,
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#endif
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};
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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 )
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* 求出文件头占用的“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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