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According to the hardware manual, when the Poll command is issued, the byte returned by the I/O read is 1 in Bit 7 when there is an interrupt, and the highest priority binary code in Bits 2:0. The current pic simulation code is not implemented strictly according to the above expression. Fix the implementation of pic_poll_read(), set Bit 7 when there is an interrupt. Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com> Link: https://lore.kernel.org/r/20230419021924.1342184-1-alexjlzheng@tencent.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.