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author | Mark Brown <broonie@linaro.org> | 2013-07-22 11:16:51 +0100 |
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committer | Mark Brown <broonie@linaro.org> | 2013-07-22 11:16:51 +0100 |
commit | 9f6772da061814c2962aeb7d79231f7510dba313 (patch) | |
tree | e0c4a856204af6adff125ee61fe1f3059cada71b /Documentation | |
parent | d998ec4860d366424a55059093bb022beb38a61d (diff) | |
parent | 0f4a56e16d5fc9028b62ba529177a3109513e111 (diff) |
Merge tag 'v3.10.2' into linux-linaro-lsk-androidlsk-android
This is the 3.10.2 stable release
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/parisc/registers | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/parisc/registers b/Documentation/parisc/registers index dd3caddd1ad..10c7d1730f5 100644 --- a/Documentation/parisc/registers +++ b/Documentation/parisc/registers @@ -78,6 +78,14 @@ Shadow Registers used by interruption handler code 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. |