From mboxrd@z Thu Jan  1 00:00:00 1970
From: pshah.mumbai@gmail.com (Prashant Shah)
Date: Wed, 1 Jun 2011 23:08:37 +0530
Subject: Clarification on memory mapping
In-Reply-To: <BANLkTin0Ge_b7S8kedbMx4NVcwQdm92etQ@mail.gmail.com>
References: <BANLkTin0Ge_b7S8kedbMx4NVcwQdm92etQ@mail.gmail.com>
Message-ID: <BANLkTik8Zz8kxvLuAFST=8n2DtnHAh46tQ@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

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.