| commit | 8e01602d43ea71b780bfe69297ea76225c3b1069 | [log] [tgz] |
|---|---|---|
| author | Rupert Swarbrick <rswarbrick@lowrisc.org> | Thu Nov 19 16:59:02 2020 +0000 |
| committer | Greg Chadwick <gac@lowrisc.org> | Mon Nov 30 12:45:20 2020 +0000 |
| tree | ced5184edb3aa502a52e516a4970fc81738c20aa | |
| parent | 28736fd45b3c2bd445ef2f0249ec39857bc98562 [diff] |
[otbn] Allow mulqacc to set flags The bn.mulqacc.wo and bn.mulqacc.so instructions now set M, L and Z flags in a specified flag group. We needed a little bit of shuffling in the encoding to make this fit. The changes are as follows: - There's now a flag group field at bit 31 (the same as other instructions that take a flag group) - The "wb" field, which chooses between the three writeback modes, has moved from bits 31-30 to bits 30-29 and has been split into two parts: "so" and "wb0". "so" is just set for bn.mulqacc.so (just like the top bit of "wb"). If "so" is not set, then "wb0" selects between bn.mulqacc and bn.mulqacc.wo. If "so" is set, "wb0" selects the destination halfword. This commit includes all ISS, RTL and specification changes required to implement the above. Fixes #2979 Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org> Signed-off-by: Greg Chadwick <gac@lowrisc.org>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
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