From: pshah.mumbai@gmail.com (Prashant Shah)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Clarification on memory mapping
Date: Wed, 1 Jun 2011 23:08:37 +0530 [thread overview]
Message-ID: <BANLkTik8Zz8kxvLuAFST=8n2DtnHAh46tQ@mail.gmail.com> (raw)
In-Reply-To: <BANLkTin0Ge_b7S8kedbMx4NVcwQdm92etQ@mail.gmail.com>
Hi,
On Wed, Jun 1, 2011 at 12:04 PM, sandeep kumar
<coolsandyforyou@gmail.com> wrote:
> Hi,
>
> ioremap() :
> 2) ioremap does mapping of a particular i/o device to kernel logical memory
> address.
Please correct me if I am wrong.
I think this function will remap the I/O registers location to a
memory location, so instead of using inb/outb you can use the memory
based functions like readb/writeb.
eg : lets say I want to read from I/O port 0x80. I will have to use
the inb() function. Now if I ioremap() it to a memory location it I
can use the readb() instead.
next prev parent reply other threads:[~2011-06-01 17:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-01 6:34 Clarification on memory mapping sandeep kumar
2011-06-01 16:00 ` Mulyadi Santosa
2011-06-01 17:38 ` Prashant Shah [this message]
2011-06-01 23:47 ` Dave Hylands
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