From mboxrd@z Thu Jan  1 00:00:00 1970
From: jlight@srcit.stevens.edu (James Light)
Date: Sat, 2 Apr 2011 12:31:54 -0400
Subject: Regarding enable paging code and swapper_pg_dir.
In-Reply-To: <20110402162534.GB7686@stevens.edu>
References: <201104020137.12899.mindentropy@gmail.com>
	<20110401211921.GH23673@stevens.edu>
	<201104021333.21661.mindentropy@gmail.com>
	<20110402162534.GB7686@stevens.edu>
Message-ID: <20110402163154.GC7686@stevens.edu>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

If you look at the 2.6.38 code for head.S, you may find the newer way it is
written to be a bit easier to read.

------------------------------------------------------------------------------
25 /* Physical address */
26 #define pa(X) ((X) - __PAGE_OFFSET)

...

345 /*
346 * Enable paging
347 */
348        movl $pa(initial_page_table), %eax
349        movl %eax,%cr3          /* set the page table pointer.. */
350        movl %cr0,%eax
351        orl  $X86_CR0_PG,%eax
352        movl %eax,%cr0          /* ..and set paging (PG) bit */
353        ljmp $__BOOT_CS,$1f     /* Clear prefetch and normalize %eip */

------------------------------------------------------------------------------

     -James