BOOT_CS

From: H. Peter Anvin (hpa_at_zytor.com)
Date: 02/21/04

  • Next message: Andrew Morton: "Re: [Patch 2/6] dm: remove v1 ioctl interface" 
    To: linux-kernel@vger.kernel.org
Date:	Sat, 21 Feb 2004 05:47:29 +0000 (UTC)

    Anyone happen to know of any legitimate reason not to reload %cs in
    head.S? I think the following would be a lot cleaner, as well as a
    lot safer (the jump and indirect branch aren't guaranteed to have the
    proper effects, although technically neither should be required due to
    the %cr0 write):

    @@ -117,10 +147,7 @@
            movl %cr0,%eax
            orl $0x80000000,%eax
            movl %eax,%cr0 /* ..and set paging (PG) bit */
    - jmp 1f /* flush the prefetch-queue */
    -1:
    - movl $1f,%eax
    - jmp *%eax /* make sure eip is relocated */
    + ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip
    */
     1:
            /* Set up the stack pointer */
            lss stack_start,%esp

    I've been doing some cleanups in head.S after making the early page
    tables dynamic.

            -hpa
    -
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  • Next message: Andrew Morton: "Re: [Patch 2/6] dm: remove v1 ioctl interface"

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