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
rrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvv
rr vvvvvvvvvvvvvvvvvvvvvv
rr vvvvvvvvvvvvvvvvvvvvvvvv rr
rrrr vvvvvvvvvvvvvvvvvvvvvvvvvv rrrr
rrrrrr vvvvvvvvvvvvvvvvvvvvvv rrrrrr
rrrrrrrr vvvvvvvvvvvvvvvvvv rrrrrrrr
rrrrrrrrrr vvvvvvvvvvvvvv rrrrrrrrrr
rrrrrrrrrrrr vvvvvvvvvv rrrrrrrrrrrr
rrrrrrrrrrrrrr vvvvvv rrrrrrrrrrrrrr
rrrrrrrrrrrrrrrr vv rrrrrrrrrrrrrrrr
rrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrr
rrrrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrr
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
