# Platform Surface Area ("Plasa")

Fuchsia Platform Surface Area (hereafter: "Plasa" for short) is an explicit
declarative record of the [Fuchsia System Interface](https://fuchsia.dev/docs/concepts/kernel/system). It is intended to
capture the pertinent state at the time the [Fuchsia Integrator Development Kit
(IDK)](https://fuchsia.dev/docs/development/idk/README) has been built.

This subsection of [`fuchsia.dev`](https://fuchsia.dev) describes Plasa for users and
implementors alike.

## Documentation

- [Platform Surface Area Manifest](https://fuchsia.dev/fuchsia-src/development/testing/ctf/plasa_manifest) design document

## Uses

Plasa provides input to the following efforts:

- Platform versioning per [RFC-0002](https://fuchsia.dev/docs/contribute/governance/rfcs/0002_platform_versioning)
- [Compatibility Tests for Fuchsia (CTF)](https://fuchsia.dev/docs/development/testing/ctf/overview) per [RFC0015](https://fuchsia.dev/docs/contribute/governance/rfcs/0015_cts)

## Limitations

Currently, Plasa provides the following platform surface fragments:

- The [FIDL](https://fuchsia.dev/docs/concepts/fidl/overview) API fragments for all public FIDL APIs in the [Fuchsia SDK](https://fuchsia.dev/docs/contribute/governance/rfcs/0106_manifest_includes_in_sdk)
- The C and C++ API fragments for all public C++ APIs in the Fuchsia SDK.

While this falls short of fully describing the entire Fuchsia System Interface,
work is underway to backfill the missing platform surface fragments.
[](https://issues.fuchsia.dev/issues/new?component=1439230&template=1881640&description=Issue+on:+https://fuchsia.dev/docs/development/testing/ctf/plasa_overview.md "Report a bug or suggest improvements on this page") [](https://cs.opensource.google/fuchsia/fuchsia/+/main:docs/development/testing/ctf/plasa_overview.md "View the source code of this page") [](https://ci.android.com/edit?repo=fuchsia/fuchsia/main&file=docs/development/testing/ctf/plasa_overview.md&cloneRepo=fuchsia/fuchsia:refs/heads/main&fullPath=fuchsia/docs/development/testing/ctf/plasa_overview.md "Edit the source code of this page")