# Platform Lexicon

This lexicon defines standard platform property names and values that servers
MAY support in the `Platform` message to facilitate interoperability.

The following standard property `name`s are defined:

* `OSFamily`: This describes the operating system family. Multiple values
  are not allowed and an exact match is required.

  The following standard values are defined:

    - `aix`
    - `freebsd`
    - `linux`
    - `macos`
    - `sunos`
    - `windows`

  Additional values may be defined by the server. For other POSIX systems
  the recommendation is to use the output of `uname -s` in lower case.

* `ISA`: This describes the instruction set architecture including
  instruction set extensions and versions. Multiple values are allowed. If
  multiple values are specified, they are AND-ed together: the worker is
  required to support all of the listed values.

  The following standard instruction set architecture values are defined:

    - `arm-a32` (little endian)
    - `arm-a32-be` (big endian)
    - `arm-a64` (little endian)
    - `arm-a64-be` (big endian)
    - `arm-t32` (little endian)
    - `arm-t32-be` (big endian)
    - `power-isa-be` (big endian)
    - `power-isa-le` (little endian)
    - `sparc-v9` (big endian)
    - `x86-32`
    - `x86-64`

  The following standard instruction set extension and version values are
  defined:

    - `arm-neon`
    - `arm-sve`
    - `arm-vfpv3`
    - `arm-vfpv4`
    - `armv6`
    - `armv7`
    - `armv8`
    - `x86-avx`
    - `x86-avx2`
    - `x86-avx-512`
    - `x86-sse4.1`
    - `x86-sse4.2`

  Additional values may be defined by the server. Vendor-neutral names are
  recommended.

  Clients SHOULD NOT request instruction set extensions or versions without
  requesting an instruction set architecture.

  Examples with multiple values:

  ```json
  // (Platform proto)
  {
    "properties": [
      {
        "name": "ISA",
        "value": "x86-64"
      },
      {
        "name": "ISA",
        "value": "x86-avx2"
      }
    ]
  }
  ```

  ```json
  // (Platform proto)
  {
    "properties": [
      {
        "name": "ISA",
        "value": "arm-a64"
      },
      {
        "name": "ISA",
        "value": "armv8"
      },
      {
        "name": "ISA",
        "value": "arm-sve"
      }
    ]
  }
  ```

  ```json
  // (Platform proto)
  {
    "properties": [
      {
        "name": "ISA",
        "value": "arm-a32"
      },
      {
        "name": "ISA",
        "value": "armv7"
      },
      {
        "name": "ISA",
        "value": "arm-vfpv4"
      }
    ]
  }
  ```