From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Sylvestre Gallon <syl@pmbsd.org>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: How works Xen mmu ?
Date: Wed, 2 Jun 2010 21:07:18 +0100 [thread overview]
Message-ID: <C82C7886.16838%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <AANLkTin-_SRSmKm6Y_Tb25ueouqzb3sPrQtnuA_seqOT@mail.gmail.com>
On 18/05/2010 09:01, "Sylvestre Gallon" <syl@pmbsd.org> wrote:
> My need is to simply perform an identity mapping at 0xb8000 to allow
> my operating system to access the vga frammebuffer. So my first idea
> was to use HYPERVISOR_mmu_update like this :
>
> mmu_update_t mmu;
> uint8_t *buf = (uint8_t *) 0xb8000;
>
> mmu.ptr = 0xb8000 | MMU_MACHPHYS_UPDATE
> mmu.val = 0xb8000
> HYPERVISOR_mmu_update(&mmu, 1, NULL, DOMID_SELF);
You need to use MMU_NORMAL_PT_UPDATE command, passing a pointer to a pte
(pagetable entry) in mmu.ptr and the value to write to that pte in mmu.val.
-- Keir
next prev parent reply other threads:[~2010-06-02 20:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-18 8:01 How works Xen mmu ? Sylvestre Gallon
2010-06-02 20:07 ` Keir Fraser [this message]
2010-06-03 13:16 ` Sylvestre Gallon
2010-06-03 13:29 ` Keir Fraser
2010-06-03 15:23 ` Sylvestre Gallon
2010-06-03 15:54 ` Keir Fraser
-- strict thread matches above, loose matches on Subject: below --
2010-05-25 13:07 Sylvestre Gallon
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