实验环境搭建

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> make qemu
***
*** Error: Couldn't find a riscv64 version of GCC/binutils.
*** To turn off this error, run 'gmake TOOLPREFIX= ...'.
***
gcc    -c -o kernel/entry.o kernel/entry.S
kernel/entry.S: Assembler messages:
kernel/entry.S:11: Error: no such instruction: `la sp,stack0'
kernel/entry.S:12: Error: no such instruction: `li a0,1024*4'
kernel/entry.S:13: Error: no such instruction: `csrr a1,mhartid'
kernel/entry.S:14: Error: no such instruction: `addi a1,a1,1'
kernel/entry.S:15: Error: too many memory references for `mul'
kernel/entry.S:16: Error: too many memory references for `add'
kernel/entry.S:20: Error: no such instruction: `j spin'
make: *** [<builtin>: kernel/entry.o] Error 1