Institute of Computer Technology ya Chinese Academy of Sciences idapereka pulojekiti ya XiangShan, yomwe kuyambira 2020 yakhala ikupanga purosesa yotseguka yogwira ntchito kwambiri potengera kapangidwe ka RISC-V instruction set architecture (RV64GC). Zomwe polojekitiyi ikuchita zatsegulidwa pansi pa chilolezo cha MulanPSL 2.0.
Pulojekitiyi yasindikiza mafotokozedwe a midadada ya hardware m'chinenero cha Chisel, chomwe chimamasuliridwa ku Verilog, kukhazikitsidwa kwa maumboni ozikidwa pa FPGA, ndi zithunzi zofanizira ntchito ya chip mu Verilog simulator yotsegula Verilator. Zithunzi ndi mafotokozedwe a zomangamanga ziliponso (zonse zoposa 400 zolemba ndi 50 zikwi mizere ya code), koma zambiri zolembedwa ndi Chinese. Debian GNU/Linux imagwiritsidwa ntchito ngati njira yolumikizira yomwe imagwiritsidwa ntchito kuyesa kukhazikitsidwa kwa FPGA.
XiangShan amadzinenera kuti ndi chipangizo chapamwamba kwambiri cha RISC-V, kuposa SiFive P550. Mwezi uno akukonzekera kumaliza kuyesa pa FPGA ndikutulutsa chipangizo cha 8-core prototype chip chomwe chikugwira ntchito ku 1.3 GHz ndikupangidwa ndi TSMC pogwiritsa ntchito ukadaulo wa 28nm, wotchedwa "Yanqi Lake". Chipchi chimaphatikizapo cache ya 2MB, chowongolera kukumbukira chothandizira kukumbukira DDR4 (mpaka 32GB ya RAM) ndi mawonekedwe a PCIe-3.0-x4.
Kuchita kwa chip choyamba mu mayeso a SPEC2006 akuyerekezedwa pa 7/Ghz, yomwe imagwirizana ndi tchipisi ta ARM Cortex-A72 ndi Cortex-A73. Pofika kumapeto kwa chaka, kupanga kwachiwiri kwa "South Lake" prototype ndi zomangamanga bwino zakonzedwa, zomwe zidzasamutsidwira ku SMIC ndi teknoloji ya 14nm ndi kuwonjezeka kwafupipafupi kufika ku 2 GHz. Chitsanzo chachiwiri chikuyembekezeka kuchita pa 2006/Ghz pamayeso a SPEC10, omwe ali pafupi ndi mapurosesa a ARM Cortex-A76 ndi Intel Core i9-10900K, komanso apamwamba kuposa SiFive P550, RISC-V CPU yachangu kwambiri, yomwe ili ndi ntchito ya 8.65 / Ghz.
Kumbukirani kuti RISC-V imapereka makina otseguka komanso osinthika owongolera makina omwe amalola kuti ma microprocessors amangidwe kuti agwiritse ntchito mosasamala popanda kulipidwa kapena kuyika mikhalidwe yogwiritsidwa ntchito. RISC-V imakupatsani mwayi wopanga ma SoC ndi mapurosesa otseguka. Pakadali pano, kutengera tsatanetsatane wa RISC-V, makampani osiyanasiyana ndi madera omwe ali ndi zilolezo zosiyanasiyana zaulere (BSD, MIT, Apache 2.0) akupanga mitundu ingapo ya ma microprocessor cores, SoCs ndi tchipisi topangidwa kale. Makina ogwiritsira ntchito omwe ali ndi chithandizo chapamwamba kwambiri cha RISC-V akuphatikizapo Linux (yomwe ilipo kuyambira kutulutsidwa kwa Glibc 2.27, binutils 2.30, gcc 7 ndi Linux kernel 4.15) ndi FreeBSD.
Source: opennet.ru