| commit | 2398dc103487685656478f20d5d734e72f502df2 | [log] [tgz] |
|---|---|---|
| author | Rupert Swarbrick <rswarbrick@lowrisc.org> | Wed Sep 23 10:06:45 2020 +0100 |
| committer | Rupert Swarbrick <rswarbrick@gmail.com> | Thu Sep 24 12:31:30 2020 +0100 |
| tree | b2f779df8caaed003e9d775c5ff0a6157f61593f | |
| parent | 2bb13de5a4b971e4516e2877fa8feb2c375e3bc9 [diff] |
[otbn] Specify flag group to update in bignum logical insns Before this patch, the bignum logical instructions updated flag group 0. This patch finds some encoding space to specify the flag group for each instruction. To do so, we switch logical operations to use the normal "funct3" function encoding (rather than their previous special "funct31" single-bit encoding) and rejig some other funct3 values to make space. The re-encoding was done by Stefan Wallentowitz; the simulator work by me. Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org> Co-authored-by: Stefan Wallentowitz <stefan.wallentowitz@gi-de.com>
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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