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There is a wraparound on CLINT_MTIMECMP (function timer_handler() inside 04-TimerInterrupt/timer.c).
If you set the interval to 1000000, the wraparound occurs just after a few minutes of Qemu running.
Once the wraparound has occurred, the timer starts firing at an extremely tiny delay (of course different than the one that was set).

我在遵循文件安裝相關套件並設定好環境變數後，進入 01-HelloOs 嘗試讓他開始執行。

1. 在 Git Bash 輸入如下指令:

make

2. 出現了以下錯誤訊息:

IAN@DESKTOP-9AEMEPL MINGW64 ~/Desktop/mini-riscv-os/01-HelloOs (master)
$ make
riscv64-unknown-elf-gcc -nostdlib -fno-builtin -mcmodel=medany -march=rv32ima -mabi=ilp32 -T os.ld -o os.elf start.s os.c
process_begin: CreateProcess(NULL, riscv64-unknown-elf-gcc -nostdlib -fno-builtin -mcmodel=medany -march=rv32ima -mabi=ilp32 -T os.ld -o os.elf start.s os.c, ...) failed.
make (e=2): ▒t▒Χ䤣▒▒▒▒w▒▒▒ɮסC
make: *** [os.elf] Error 2

想請問有可能是哪個環節出了錯誤，謝謝。

你好，
针对 05-Preemptive 这个例子，sys_timer 函数通过 mret 跳转到 sys_kernel 中去执行切换人物的工作，但我认为此时中断已经开了，我怀疑 万一在此期间发生timer interrupt 是不是会有问题？