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Correct signs and explicitly clarify MTTL2 table sizes #53

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Jul 2, 2024
Merged

Correct signs and explicitly clarify MTTL2 table sizes #53

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Correct signs and eplicitly clarify MTTL2 table sizes
grg-haas Jun 19, 2024
5b8a018
Merge branch 'main' into bugfix/signs
rsahita Jul 2, 2024
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12 changes: 6 additions & 6 deletions chapter3.adoc
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Expand Up @@ -108,13 +108,13 @@ Implementations are not required to support all defined `MODE` settings when
`XLEN=64`. A write to `mttp` with an unsupported `MODE` value is not ignored.
Instead, the fields of `mttp` are `WARL` in the normal way, when so indicated.

The `PPN` refers to an `MTTL3` table or an `MTTL2` table based on physical
address width (`PAW`). For 56 \<= `PAW` < 46, `MTTL3` table must be of size
The `MTTPPN` refers to an `MTTL3` table or an `MTTL2` table based on physical
address width (`PAW`). For 56 >= `PAW` > 46, `MTTL3` table must be of size
`2^(PAW-43)` bytes and naturally aligned to that sized byte boundary. For 46
\<= `PAW` < 32 the `MTTL2` table must be of size 2^(`PAW`-23) or 2^(`PAW`-22)
bytes (depending on the Smmtt `MODE` selected) and must be naturally aligned to
that sized byte boundary. In these modes, the lowest two bits of the physical
page number (`PPN`) in `mttp` always read as zeros.
>= `PAW` > 32 the `MTTL2` table must be of size 2^(`PAW`-23) bytes for `Smmtt46`
and `Smmtt34`, 2^(`PAW`-22) bytes for `Smmtt46rw` and `Smmtt34rw`, and must be
naturally aligned to that sized byte boundary. In these modes, the lowest two
bits of the physical page number (`MTTPPN`) in `mttp` always read as zeros.

The number of `SDID` bits is `UNSPECIFIED` and may be zero. The number of
implemented `SDID` bits, termed `SDIDLEN`, may be determined by writing one to
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