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Re: [Qemu-devel] [PATCH 2/4] TCG x86: add lock mov cr0 = cr8
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH 2/4] TCG x86: add lock mov cr0 = cr8 |
Date: |
Sun, 4 Oct 2009 14:06:59 +0200 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Sat, Sep 19, 2009 at 12:30:47AM +0200, Andre Przywara wrote:
> AMD CPUs featuring a shortcut to access CR8 even from 32-bit mode.
> If you use the LOCK prefix with "mov CR0", it accesses CR8 instead.
> This behavior is guarded by the CR8_LEGACY CPUID bit
> (Fn8000_0001:ECX[1]).
Thanks, applied.
> Signed-off-by: Andre Przywara <address@hidden>
> ---
> target-i386/translate.c | 4 ++++
> 1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/target-i386/translate.c b/target-i386/translate.c
> index aaa4492..134c870 100644
> --- a/target-i386/translate.c
> +++ b/target-i386/translate.c
> @@ -7362,6 +7362,10 @@ static target_ulong disas_insn(DisasContext *s,
> target_ulong pc_start)
> ot = OT_QUAD;
> else
> ot = OT_LONG;
> + if ((prefixes & PREFIX_LOCK) && (reg == 0) &&
> + (s->cpuid_ext3_features & CPUID_EXT3_CR8LEG)) {
> + reg = 8;
> + }
> switch(reg) {
> case 0:
> case 2:
> --
> 1.6.1.3
>
>
>
>
>
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
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