linux-kernel - Mapping ram memory using ioremap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Wed, 11 May 2022 16:00:14 -0700
From:   noman pouigt <variksla@...il.com>
To:     linux-kernel@...r.kernel.org,
        kernelnewbies <kernelnewbies@...nelnewbies.org>
Subject: Mapping ram memory using ioremap

We are using part of DRAM as shared memory
between DSP and SoC. However, DSP
can only access higher 1GB of DRAM.

In order to map the aforementioned memory
I tried using ioremap and it blurted out the
warning as mentioned in this article.
https://lwn.net/Articles/409700/

What is the alternative to using ioremap to
map specific RAM memory region for use
in the driver as shared memory?

I tried memremap + reserved memory as well
and it failed.