本文主要是介绍体验开源香山高性能开源 RISC-V 处理器，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
整体架构设计
香山处理器是乱序六发射结构设计，目前支持 RV64GCBK 扩展。香山处理器前端流水线包括分支预测单元、取指单元、指令缓冲等单元，顺序取指。后端包括译码、重命名、重定序缓冲、保留站、整型/浮点寄存器堆、整型/浮点运算单元。
doc
https://xiangshan-doc.readthedocs.io/zh-cn/latest/
香山的官方文档仓库，包括香山项目的整体介绍、代码仓库概览、集成指南、上手教程、处理器核介绍、开发工具链介绍等内容
demo
仿真程序运行日志
Using simulated 32768B flash
isWriteICacheTable0 = 0
isWriteFetchToIBufferTable0 = 0
isWriteIfuWbToFtqTable0 = 0
isWritePrefetchPtrTable0 = 0
isWriteFTQTable0 = 0
isWriteBankConflictTable0 = 0
depth0 = 32
enableDynamicPrefetcher0 = 1
StoreWaitThreshold_0 = 0
nMaxPrefetchEntry0 = 14
isWriteL1MissQMissTable0 = 0
isWriteLoadMissTable0 = 0
isFirstHitWrite0 = 0
isWriteLoadAccessTable0 = 0
isWriteL2TlbPrefetchTable0 = 0
isWriteL1TlbTable0 = 0
isWritePageCacheTable0 = 0
isWritePTWTable0 = 0
isWriteL2TlbMissQueueTable0 = 0
ColdDownThreshold_0 = 12
ForceWriteUpper_0 = 60
ForceWriteLower_0 = 55
StoreBufferThreshold_0 = 7
StoreBufferBase_0 = 4
CorrectMissTrain0 = 0
isWriteInstInfoTable0 = 0
Using simulated 8192MB RAM
The image is /opt/sdb/xiangshan/xs-env/XiangShan/ready-to-run/linux.bin
The reference model is /opt/sdb/xiangshan/xs-env/NEMU/build/riscv64-nemu-interpreter-so
The first instruction of core 0 has commited. Difftest enabled.
bbl loader
freq-mhz = 500
CLINT: set frequency to 500 MHzvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
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rrrrrrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrrrrINSTRUCTION SETS WANT TO BE FREE
[ 0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
[ 0.000000] Linux version 4.18.0-00046-g2ba394515c09-dirty (wkf@xiangshan-05) (gcc version 9.2.0 (GCC)) #113 Thu Feb 4 21:45:54 CST 2021
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] Initial ramdisk at: 0x(____ptrval____) (23552 bytes)
[ 0.000000] Zone ranges:
[ 0.000000] DMA32 empty
[ 0.000000] Normal [mem 0x0000000080200000-0x0000000081ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080200000-0x0000000081ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x0000000081ffffff]
[ 0.000000] Cannot allocate SWIOTLB buffer
[ 0.000000] elf_hwcap is 0x112d
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 7575
[ 0.000000] Kernel command line: root=/dev/mmcblk0 rootfstype=ext4 ro rootwait earlycon
[ 0.000000] Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.000000] Sorting __ex_table...
[ 0.000000] Memory: 29140K/30720K available (666K kernel code, 80K rwdata, 102K rodata, 88K init, 98K bss, 1580K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0
[ 0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 3526361616960 ns
[ 0.000000] console [hvc0] enabled
[ 0.000000] console [hvc0] enabled
[ 0.000000] bootconsole [early0] disabled
[ 0.000000] bootconsole [early0] disabled
[ 0.000000] Calibrating delay loop (skipped), value calculated using timer frequency.. 2.00 BogoMIPS (lpj=10000)
[ 0.000000] pid_max: default: 4096 minimum: 301
[ 0.000000] Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
[ 0.000000] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes)
[ 0.000000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.010000] clocksource: Switched to clocksource riscv_clocksource
[ 0.010000] Unpacking initramfs...
[ 0.020000] workingset: timestamp_bits=62 max_order=13 bucket_order=0
[ 0.020000] random: get_random_bytes called from 0xffffffff8001998a with crng_init=0
[ 0.020000] Freeing unused kernel memory: 88K
[ 0.020000] This architecture does not have kernel memory protection.
now = 2244s
Hello, RISC-V World!
Core 0: HIT GOOD TRAP at pc = 0x100cc
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