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    Subject[ 21/72] parisc: document the shadow registers
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Helge Deller <deller@gmx.de>

    commit a83f58bcb24003b9de2364de7c829a263423ead7 upstream.

    Signed-off-by: Helge Deller <deller@gmx.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    Documentation/parisc/registers | 8 ++++++++
    1 file changed, 8 insertions(+)

    --- a/Documentation/parisc/registers
    +++ b/Documentation/parisc/registers
    @@ -78,6 +78,14 @@ Shadow Registers used by interruption h
    TOC enable bit 1

    =========================================================================
    +
    +The PA-RISC architecture defines 7 registers as "shadow registers".
    +Those are used in RETURN FROM INTERRUPTION AND RESTORE instruction to reduce
    +the state save and restore time by eliminating the need for general register
    +(GR) saves and restores in interruption handlers.
    +Shadow registers are the GRs 1, 8, 9, 16, 17, 24, and 25.
    +
    +=========================================================================
    Register usage notes, originally from John Marvin, with some additional
    notes from Randolph Chung.




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