📄 skyeye硬件模拟平台，第三部分 硬件仿真实现之三.htm
字号:
*data = mem_read_word(state, pa);
else {
printf("SKYEYE:2 sa_mmu_read error: unknown
data type %d\n", datatype);
exit(-1);
}
return 0;
}
/*根据读类型和Endian模式整理结果*/
datatrans:
if (datatype==ARM_HALFWORD_TYPE){
temp = *data;
offset = (((ARMword) state->bigendSig * 2) ^ (real_va & 2)) <<
3; /* bit offset into the word */
*data= (temp>> offset) & 0xffff;
} else if (datatype==ARM_BYTE_TYPE) {
temp = *data;
offset = (((ARMword) state->bigendSig * 3) ^ (real_va & 3)) <<
3; /* bit offset into the word */
*data=(temp >> offset & 0xffL);
}
end:
return 0;
}
</CODE></PRE></TD></TR></TBODY></TABLE>
<P>SA MMU的mcr操作</P><A name=IDAX0PTB><B></B></A><BR>
<TABLE cellSpacing=0 cellPadding=5 width="100%" bgColor=#cccccc
border=1><TBODY>
<TR>
<TD><PRE><CODE>
static void
sa_mmu_mcr(ARMul_State *state, ARMword instr, ARMword value)
{
mmu_regnum_t creg = BITS(16, 19) & 15;
if (!strncmp(skyeye_config.cpu->cpu_arch_name, "armv4", 5) )
{
switch (creg) {
………………….
case MMU_CACHE_OPS:
sa_mmu_cache_ops(state, instr, value);
break;
case MMU_TLB_OPS:
sa_mmu_tlb_ops(state, instr, value);
break;
case MMU_SA_RB_OPS:
sa_mmu_rb_ops(state, instr, value);
break;
case MMU_SA_DEBUG:
break;
case MMU_SA_CP15_R15:
break;
case MMU_PID:
state->mmu.process_id = value & 0x8e000000;
break;
default:
printf("mmu_mcr wrote UNKNOWN - reg %d\n", creg);
break;
}
}
}
</CODE></PRE></TD></TR></TBODY></TABLE>
<P>sa_mmu_mcr实现SA MMU特定的cache, tlb, read buffer, write buffer等操作。</P>
<P><A name=IDA50PTB><SPAN class=atitle3>8.
Memory系统的实现</SPAN></A><BR>SkyEye memory系统的模拟实现的基本思想是：</P>
<P>1． 地址划分，每个划分区域都提供对应的读写函数</P>
<P>2． 通过skyeye.conf配置文件配置memory地址区域</P>
<P>数据结构</P><A name=IDAI1PTB><B></B></A><BR>
<TABLE cellSpacing=0 cellPadding=5 width="100%" bgColor=#cccccc
border=1><TBODY>
<TR>
<TD><PRE><CODE>
typedef struct mem_bank_t {
ARMword (*read_byte)(ARMul_State *state, ARMword addr);
void (*write_byte)(ARMul_State *state, ARMword addr, ARMword data);
ARMword (*read_halfword)(ARMul_State *state, ARMword addr);
void (*write_halfword)(ARMul_State *state, ARMword addr, ARMword data);
ARMword (*read_word)(ARMul_State *state, ARMword addr);
void (*write_word)(ARMul_State *state, ARMword addr, ARMword data);
unsigned long addr, len;
char filename[MAX_STR];
} mem_bank_t;
typedef struct {
int bank_num;
int current_num; /*current num of bank*/
mem_bank_t mem_banks[MAX_BANK];
} mem_config_t;
</CODE></PRE></TD></TR></TBODY></TABLE>
<P>配置函数</P>
<P>int do_mem_bank_option(skyeye_option_t *this_option, int num_params,
const char *params[])； /*完成memory bank的配置*/</P>
<P>读写接口函数</P><A name=IDAS1PTB><B></B></A><BR>
<TABLE cellSpacing=0 cellPadding=5 width="100%" bgColor=#cccccc
border=1><TBODY>
<TR>
<TD><PRE><CODE>
ARMword mem_read_byte(ARMul_State *state, ARMword addr);
ARMword mem_read_halfword(ARMul_State *state, ARMword addr);
ARMword mem_read_word(ARMul_State *state, ARMword addr);
void mem_write_byte(ARMul_State *state, ARMword addr, ARMword data);
void mem_write_halfword(ARMul_State *state, ARMword addr, ARMword data);
void mem_write_word(ARMul_State *state, ARMword addr, ARMword data);
</CODE></PRE></TD></TR></TBODY></TABLE>
<P>实现方式都是先根据地址在mem_config_t中找到对应的mem_bank,再调用mem_bank对应的读写函数。</P>
<P>内存区域的读写函数</P><A name=IDA11PTB><B></B></A><BR>
<TABLE cellSpacing=0 cellPadding=5 width="100%" bgColor=#cccccc
border=1><TBODY>
<TR>
<TD><PRE><CODE>
ARMword real_read_byte(ARMul_State *state, ARMword addr);
void real_write_byte(ARMul_State *state, ARMword addr, ARMword data);
ARMword real_read_halfword(ARMul_State *state, ARMword addr);
void real_write_halfword(ARMul_State *state, ARMword addr, ARMword data);
ARMword real_read_word(ARMul_State *state, ARMword addr);
void real_write_word(ARMul_State *state, ARMword addr, ARMword data);
</CODE></PRE></TD></TR></TBODY></TABLE>
<P>IO区域的读写函数</P><A name=IDAD2PTB><B></B></A><BR>
<TABLE cellSpacing=0 cellPadding=5 width="100%" bgColor=#cccccc
border=1><TBODY>
<TR>
<TD><PRE><CODE>
ARMword io_read_byte(ARMul_State *state, ARMword addr);
void io_write_byte(ARMul_State *state, ARMword addr, ARMword data);
ARMword io_read_halfword(ARMul_State *state, ARMword addr);
void io_write_halfword(ARMul_State *state, ARMword addr, ARMword data);
ARMword io_read_word(ARMul_State *state, ARMword addr);
void io_write_word(ARMul_State *state, ARMword addr, ARMword data);
</CODE></PRE></TD></TR></TBODY></TABLE>
<P>这些函数将IO的读写转换成模拟的CPU的IO读写</P>
<P><A name=resources><SPAN class=atitle2>参考资料 </SPAN></A>
<UL>
<LI>本文节自<A
href="http://www.china-pub.com/computers/common/info.asp?id=21879"
target=_blank
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">《源码开放的嵌入式系统软件分析与实践--基于SkyEye和ARM开发平台》</A>一书的第三章，对
SkyEye 开源项目感兴趣的可以阅读本书。<BR><BR>
<LI><A
href="http://www-900.ibm.com/developerworks/cn/linux/l-skyeye/part1/index.shtml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">SkyEye硬件模拟平台,
第一部分: SkyEye 介绍</A><BR><BR>
<LI><A
href="http://www-900.ibm.com/developerworks/cn/linux/l-skyeye/part2/index.shtml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">SkyEye硬件模拟平台，第二部分:
安装与使用</A><BR><BR>
<LI><A
href="http://www-900.ibm.com/developerworks/cn/linux/l-skyeye/part3/s1/index.shtml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">SkyEye硬件模拟平台，第三部分:
硬件仿真实现之一</A><BR><BR>
<LI><A
href="http://www-900.ibm.com/developerworks/cn/linux/l-skyeye/part3/s2/index.shtml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">SkyEye硬件模拟平台，第三部分:
硬件仿真实现之二</A><BR><BR>
<LI>在 <A href="http://www-900.ibm.com/developerworks/cn/linux/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">developerWorks
Linux 专区</A> 可以找到更多为 Linux 开发者准备的参考资料。<BR></LI></UL>
<P></P>
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<TD><A name=author1></A><SPAN class=atitle2>关于作者</SPAN><BR>
<P>陈渝, 清华大学，通过 <A href="mailto:yuchen@tsinghua.edu.cn"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">yuchen@tsinghua.edu.cn</A>
可以和他联系。</P></TD></TR></TBODY></TABLE><BR clear=all><IMG height=10 alt=""
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