From: "ron minnich" <rminnich@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] double-mapping KZERO in l.s
Date: Wed, 22 Aug 2007 19:02:08 -0400 [thread overview]
Message-ID: <13426df10708221602l51238c48x2e4d6999891fc158@mail.gmail.com> (raw)
In-Reply-To: <0e977e85c6ff64d54bac0b0301754f40@coraid.com>
On 8/22/07, erik quanstrom <quanstro@coraid.com> wrote:
> perhaps this is completely obvious, but why are the first
> 4 mb double-mapped in l.s at virtual address 0 and KZERO?
>
you start out executing with real memory addresses, i.e. you are
executing code at 0x100000 not at KZERO+0x100000. There is a period of
time where you are executing at those low addresses, then you pop up
to KZERO space and you blow away the low mappings by clearing
PDO(KZERO).
ron
next prev parent reply other threads:[~2007-08-22 23:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-22 21:51 erik quanstrom
2007-08-22 23:02 ` ron minnich [this message]
2007-08-22 23:44 ` erik quanstrom
2007-08-23 1:42 ` ron minnich
2007-08-23 1:54 ` erik quanstrom
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