除了与核连接,硬件加速器还能通过mem通道向L1 D-Cache发送请求;通过ptw通道访问page-table walker;通过fpu_req/fpu_resp访问FPU。 RoCC接口对自定义指令的编码有一些约束:指令编码格式为R-type;opcode只能使用custom0/1/2/3;funct3域段被占用,用于指示是否使用rs1、rs2、rd。留给用户使用的只有funct7域段,每个o...
从2017年开始关注并研究RISC-V开源指令集的32位MCU架构,针对快速中断响应、高带宽数据DMA进行优化,自定义压缩指令,研发设计硬件压栈(HPE,Hardware Prologue/Epilogue),并创新性提出免表中断(VTF,Vector Table Free)技术,即免查表方式中断寻址技术,同时引入两线仿真调试接口。 目前已形成了侧重于低功耗或高性能等,多个...
https://github.com/isrc-cas/bishengjdk-11-mirror/blob/risc-v/src/hotspot/cpu/riscv/templateTable_riscv.cpp 这里所使用的就是RISC-V的汇编语言。按照Java SE 11的虚拟机规范(https://docs.oracle.com/javase/specs/jvms/se11/html/jvms-6.html#jvms-6.5),lastore是要把long数据存储到long数组里: ...
在TemplateInterpreterGenerator::set_short_entry_points()函数后，__pop(ltos)操作触发generate_and_dispatch()函数，调用模板表中的生成函数，即TemplateTable::lastore()函数。至此，解决模板表中opcode参数弹出问题，实现完整指令执行流程。
Ah ha, this opcode is translated one-to-one to the VADD instruction! No surprises at all. 可以想象,在 RISC-V 上,这种方法确实会比简单地回退到解释器有更好的性能,但与手头有 Neon 指令的 AArch64 相比,它就差远了。 RISC-V 指令集以多样性而闻名(如果你讨厌 RISC-V,你也可以说是碎片化)。这...
About the new MAC instruction, it is implemented in a very preliminary way with the opcode 7'b0001011 (custom-0 opcode). I am checking about the possibility to use the p.mac instruction, but at this time the instruction is hand encoded in the mac() function available in the stdio.c ...
The compressed instruction encodings are mostly common across RV32C, RV64C, and RV128C, but as shown in Table [rvcopcodemap], a few opcodes are used for different purposes depending on base ISA. For example, the wider address-space RV64C and RV128C variants require additional opcodes to...
Extended Data Fig. 6 OEP assembly. The cross-section of the OEP assembly process of assembling Flex-RV as a FlexIC onto a FlexPCB is shown. Extended Data Table 1 C-SPI commands Full size table Extended Data Table 2 Test benchmarks used to test Flex-RV Full size table ...
Data address breakpoints (watchpoints), Instruction address breakpoints, and environment break exceptions (EBREAK) all have the same Exception code (3), but different priority, as shown in the table above. 数据地址断点(监视点)、指令地址断点以及环境中断异常(EBREAK)都具有相同的异常代码(3),但优先...
instr-table.tex : the latex table of instructions used in the riscv-unpriv spec priv-instr-table.tex : the latex table of instruction used in the riscv-priv spec inst.chisel : chisel code to decode instructions inst.sverilog : system verilog code to decode instructions inst.rs : rust co...