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Re: i386 start routine

Le 21/09/2019 à 04:22, Emmanuel Dreyfus a écrit :
Emmanuel Dreyfus <manu%netbsd.org@localhost> wrote:

The CR0 change cause the memory pointed by the stack pointer to be
unmapped. As a result, the pushl $begin does not push begin adddress on
the stack, and ret launches us in the twilight zone.

Why enabling protected mode and paging makes a mapping disapear?

Further reading teaches me that setting CR0_PG enable the mapping given
in CR3, which was built earlier in the file. I understand the temporary
stack is not mapped. I wonder how this is supposed to work.

The temporary stack is part of .data, which is mapped.

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