From: mdaljeet@in.ibm.com
To: mingo@elte.hu
Cc: linux-kernel@vger.kernel.org, Pete Wyckoff <pw@osc.edu>
Subject: Re: pte_page
Date: Thu, 31 May 2001 15:27:38 +0530 [thread overview]
Message-ID: <CA256A5D.0036C6B6.00@d73mta01.au.ibm.com> (raw)
I am doing a DMA from a card to system memory. The system memory "physical
address" is '0x104000'. I am doing this on x86 with kernel version 2.4.2.
Can this address be the address of a user space buffer?
Regards,
Daljeet.
|--------+----------------------->
| | Ingo Molnar |
| | <mingo@elte.h|
| | u> |
| | |
| | 05/30/01 |
| | 11:09 PM |
| | Please |
| | respond to |
| | mingo |
| | |
|--------+----------------------->
>--------------------------------------------------------|
| |
| To: Pete Wyckoff <pw@osc.edu> |
| cc: Daljeet Maini/India/IBM@IBMIN, |
| linux-kernel@vger.kernel.org |
| Subject: Re: pte_page |
>--------------------------------------------------------|
On Wed, 30 May 2001, Pete Wyckoff wrote:
> > __pa(page_address(pte_page(pte))) is the address you want. [or
> > pte_val(*pte) & (PAGE_SIZE-1) on x86 but this is platform-dependent.]
>
> Does this work on x86 non-kmapped highmem user pages too? (i.e. is
> page->virtual valid for every potential user page.)
you are right, the highmem-compatible solution is to use page-mem_map as
the physical page index.
Ingo
next reply other threads:[~2001-05-31 10:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-31 9:57 mdaljeet [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-05-30 8:01 pte_page mdaljeet
2001-05-30 12:26 ` pte_page Brian Gerst
2001-05-30 12:38 ` pte_page Brian Gerst
2001-05-30 14:09 ` pte_page Ingo Molnar
2001-05-30 17:08 ` pte_page Pete Wyckoff
2001-05-30 17:39 ` pte_page Ingo Molnar
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