linux-kernel - Re: [PATCH] x86: x86_{phys,virt}

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Date:	Thu, 18 Sep 2008 00:52:39 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH] x86: x86_{phys,virt}_bits field also for i386 (v3)

On Thu, Sep 18, 2008 at 12:13 AM, Jan Beulich <jbeulich@...ell.com> wrote:
> Make the x86_{phys,virt}_bits common for 32- and 64-bits, and use the
> former in ioremap's phys_addr_valid() check also on 32bit/PAE.
>
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
>
> ---
>  arch/x86/kernel/cpu/common.c |   17 +++++++++++++++--
>  arch/x86/mm/ioremap.c        |   15 +++++++--------
>  include/asm-x86/processor.h  |    4 ++--
>  3 files changed, 24 insertions(+), 12 deletions(-)
>
> --- linux-tip.orig/arch/x86/kernel/cpu/common.c
> +++ linux-tip/arch/x86/kernel/cpu/common.c
> @@ -439,6 +439,11 @@ void __cpuinit cpu_detect(struct cpuinfo
>                        c->x86_cache_alignment = c->x86_clflush_size;
>                }
>        }
> +
> +#ifdef CONFIG_X86_32
> +       if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36))
> +               c->x86_phys_bits = 36;
> +#endif
>  }
>
>  static void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c)
> @@ -464,14 +469,18 @@ static void __cpuinit get_cpu_cap(struct
>                }
>        }
>
> -#ifdef CONFIG_X86_64
>        if (c->extended_cpuid_level >= 0x80000008) {
>                u32 eax = cpuid_eax(0x80000008);
>
>                c->x86_virt_bits = (eax >> 8) & 0xff;
>                c->x86_phys_bits = eax & 0xff;
> +               /* CPUID workaround for Intel 0F33/0F34 CPU */
> +               if (c->x86_vendor == X86_VENDOR_INTEL
> +                   && c->x86 == 0xF && c->x86_model == 0x3
> +                   && (c->x86_mask == 0x3
> +                       || c->x86_mask == 0x4))
> +                       c->x86_phys_bits = 36;

please move those lines to intel.c

YH
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