From mboxrd@z Thu Jan  1 00:00:00 1970
From: kipade@163.com (kipade)
Date: Thu, 7 Dec 2017 15:09:39 +0800 (CST)
Subject: What happened when the user space application accesss device
	registers via mapped memory on /dev/mem?
Message-ID: <3bdea75e.77f5.1602fceef72.Coremail.kipade@163.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi all,
I want to know the details of device(not physical ram device) registers via mapped memory on /dev/mem.
For example, a Soc CPU has some internal device register resources, the driver will map the memory

block to a virtual memory to kernel. But, the user application can use /dev/mem to access it(devmem2).
I want to know why? and what's happened on the backend?
Thanks.
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