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Although Linux does not use format-0 channel command words (CCW0) these are a non-optional part of the platform spec, and for the sake of platform compliance, and possibly some non-Linux guests, we have to support CCW0. Making the kernel execute a format 0 channel program is too much hassle because we would need to allocate and use memory which can be addressed by 24 bit physical addresses (because of CCW0.cda). So we implement CCW0 support by translating the channel program into an equivalent CCW1 program instead. Based upon an orginal patch by Kai Yue Wang. Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Message-Id: <20170317031743.40128-16-bjsdjshi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.