From: erik quanstrom <quanstro@coraid.com>
To: 9fans@cse.psu.edu
Subject: [9fans] double-mapping KZERO in l.s
Date: Wed, 22 Aug 2007 17:51:23 -0400 [thread overview]
Message-ID: <0e977e85c6ff64d54bac0b0301754f40@coraid.com> (raw)
perhaps this is completely obvious, but why are the first
4 mb double-mapped in l.s at virtual address 0 and KZERO?
also, am i mixed up or should the comment about the double
mapping be on the following line?
- erik
/*
* Now ready to use the new map. Make sure the processor options are what is wanted.
* It is necessary on some processors to immediately follow mode switching with a JMP instruction
* to clear the prefetch queues.
*/
MOVL $PADDR(CPU0PDB), CX /* load address of page directory */
MOVL (PDO(KZERO))(CX), DX /* double-map KZERO at 0 */
MOVL DX, (PDO(0))(CX)
MOVL CX, CR3
next reply other threads:[~2007-08-22 21:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-22 21:51 erik quanstrom [this message]
2007-08-22 23:02 ` ron minnich
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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