如何使用具有8个以上内核的fs.py运行gem5 arm aarch64完整系统仿真? [英] How to run a gem5 arm aarch64 full system simulation with fs.py with more than 8 cores?
问题描述
如果我尝试使用多个--num-cpus=8个内核，例如16、32或64，则终端保持空白.
If I try to use more than --num-cpus=8 cores, e.g. 16, 32 or 64, the terminal just stays blank.
使用gem5在提交2a9573f5942b5416fb0570cf5cb6cdecba733392和Linux内核4.16上进行了测试.
Tested with gem5 at commit 2a9573f5942b5416fb0570cf5cb6cdecba733392 and Linux kernel 4.16.
相关主题: https://www.mail- archive.com/gem5-users@gem5.org/msg15469.html
推荐答案
If I add more to Ciro's answer, the current GICv2 model in gem5 supports single core by default because of this line of code. Without enabling gem5ExtensionsEnabled, it won't update the highest_int with the receiving interrupt number, and as a result the received interrupt won't get posted to a specified cpu to invoke a handler. That is, there is no jump to interrupt handler. In addition, even when we turn on gem5ExtensionsEnabled, I think that it will support up to 4 cores because the default values of INT_BITS_MAX and itLines are 32 and 128, respectively (see this); it checks 32 interrupt lines per core across 4 cores. For example, imagine that a system features 16 cores and cpu 5 executes the loop. Also, suppose that the other core (say core 11) already has an interrupt with higher priority than this. Then, the loop will ignore the other interrupt from core 11 because the loop index x can grow at most to 3.
要打开gem5ExtensionsEnabled，您可以按照Ciro的说明将选项--param='system.realview.gic.gem5_extensions=True'传递给命令.但是，请注意，该参数用于在gem5ExtensionsEnabled，仅当固件代码以GICD_TYPER偏移量将一些数据(0x200)写入GIC分配器寄存器时启用(请参见
To turn on gem5ExtensionsEnabled, you can pass an option --param='system.realview.gic.gem5_extensions=True' to your command as Ciro stated. However, note that the parameter is used to set haveGem5Extensions variable at here, not setting gem5ExtensionsEnabled, which is enabled only when a firmware code writes some data (0x200) to GIC distributor register at GICD_TYPER offset (see this).
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