From: Timur Tabi <ttabi@interactivesi.com>
To: linux-kernel@vger.kernel.org
Subject: Re: pte_val(*pte) as lvalue
Date: Tue, 03 Jul 2001 13:50:05 -0500 [thread overview]
Message-ID: <3B4213DD.50005@interactivesi.com> (raw)
In-Reply-To: <9LUWoC.A.W3G.sIQQ7@dinero.interactivesi.com.suse.lists.linux.kernel> <oupelryykh5.fsf@pigdrop.muc.suse.de> <LScPx.A.XAF.H_gQ7@dinero.interactivesi.com> <20010703194300.A31954@flint.arm.linux.org.uk>
Russell King wrote:
>Can I ask what the nature of the PTE modification is, and where you
>are making this modification?
>
I've written a hack which enables PAT (Page Address Translation) for a
particular page:
void set_pte_pat(pte_t *pte, unsigned long pat_index)
{
unsigned long p = pte_val(*pte);
p &= ~(_PAGE_PROTNONE | _PAGE_PCD | _PAGE_PWT); // zero-out the
relevant bits
if (pat_index & 4)
p |= _PAGE_PROTNONE;
if (pat_index & 2)
p |= _PAGE_PCD;
if (pat_index & 1)
p |= _PAGE_PWT;
#if CONFIG_X86_PAE
pte->pte_high = 0;
pte->pte_low = p;
#else
pte_val(*pte) = p;
#endif
--
Timur Tabi
Interactive Silicon
next prev parent reply other threads:[~2001-07-03 18:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <9LUWoC.A.W3G.sIQQ7@dinero.interactivesi.com.suse.lists.linux.kernel>
2001-07-02 23:33 ` pte_val(*pte) as lvalue Andi Kleen
2001-07-03 19:55 ` eCos Matthew M. DeLoera
2001-07-03 18:32 ` pte_val(*pte) as lvalue Timur Tabi
2001-07-03 18:43 ` Russell King
2001-07-03 18:50 ` Timur Tabi [this message]
2001-07-03 19:11 ` Russell King
2001-07-02 23:22 Timur Tabi
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