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Improve the prior shared memory setup requirements #222

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Merged
merged 1 commit into from
Oct 9, 2025
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Improve the prior shared memory setup requirements #222

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8 changes: 6 additions & 2 deletions src/ext-mpxy.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ that implements the message protocol. The remote entity can be implemented as a
system-level partition on the same hart or as firmware running on a platform
microcontroller or emulated by an SBI implementation. The supervisor software
MUST call the `sbi_mpxy_set_shmem` function to set up the shared memory before
calling any other function defined in the extension.
calling any other function which uses shared memory for any kind of data transfer.

=== SBI MPXY and Dedicated SBI extension rule
The implementation may only provide either an SBI MPXY or a dedicated SBI
Expand Down Expand Up @@ -296,6 +296,9 @@ following requirements:
This function always returns SBI_SUCCESS in `sbiret.error` and it will return
the shared memory size in `sbiret.uvalue`.

NOTE: This function does not require the prior setup of shared memory using the
`sbi_mpxy_set_shmem` function.

=== Function: Set shared memory (FID #1)

```c
Expand Down Expand Up @@ -392,7 +395,8 @@ parameters does not satisfy the requirements described in
|===

NOTE: The supervisor software MUST call this function to setup the shared
memory first before calling any other function in this extension.
memory first before calling any other function which uses shared memory for any
kind of data transfer.

=== Function: Get Channel IDs (FID #2)

Expand Down