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Stash to store some first ideas about user and kernel mode
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#define LIBCALL(x, y) RSUB x, y
#define SYSCALL(x) INT x
User mode:
INT SYSMULU or shorter SYSCALL(SYSMUL)
...
SYSMULU RSUB MULU
RTI
Kernel mode:
RSUB MULU
...
MULU DO_SOMETHING_COOL
...
RET
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