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xen-devel
[Xen-devel] Re: [RFC PATCH 16/33] Add support for Xen to entry.S.
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To: |
Chris Wright <chrisw@xxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC PATCH 16/33] Add support for Xen to entry.S. |
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From: |
Arjan van de Ven <arjan@xxxxxxxxxxxxx> |
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Date: |
Tue, 18 Jul 2006 12:11:56 +0200 |
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Cc: |
Andrew Morton <akpm@xxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Andi Kleen <ak@xxxxxxx>, virtualization@xxxxxxxxxxxxxx, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Thu, 20 Jul 2006 05:11:17 -0700 |
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On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote:
> +#ifndef CONFIG_XEN
> movl %cr0, %eax
> testl $0x4, %eax # EM (math emulation bit)
> - jne device_not_available_emulate
> - preempt_stop
> - call math_state_restore
> - jmp ret_from_exception
> -device_not_available_emulate:
> + je device_available_emulate
> pushl $0 # temporary storage for ORIG_EIP
> CFI_ADJUST_CFA_OFFSET 4
> call math_emulate
> addl $4, %esp
> CFI_ADJUST_CFA_OFFSET -4
> + jmp ret_from_exception
> +device_available_emulate:
> +#endif
Hi,
can you explain what this chunk is for? It appears to be for the non-xen
case due to the ifndef, yet it seems to visibly change the code for
that... that deserves an explanation for sure ...
Greetings,
Arjan van de Ven
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