ARM System Control and Management Interface v1.0 - 下载与SCP代码对比指南
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"ARM System Control and Management Interface (SCP) v1.0是一个由ARMLimited及其关联公司于2017年发布的平台设计文档。该手册详细阐述了SCP的非保密系统控制和管理界面，旨在帮助用户理解和操作ARM平台的系统控制功能。SCP 1.0是首次对外公开的版本，标志着这一技术的里程碑。
版权信息表明，所有权利归ARMLimited及其关联公司所有，未经书面许可，任何形式的复制或实施文档中的信息都必须获得ARM的明确授权。这体现了对知识产权的保护，包括但不限于版权、专利申请以及可能存在的专利权。SCP的设计文档不仅包含了功能描述，还包含了变更历史表，便于跟踪文档的更新和变化，如2017年5月的Issue A，该版本由非保密状态升级，并且首次发布。
阅读SCP手册时，建议配合SCP的源代码，以便更深入地理解其实际应用和工作原理。这份文档对于系统管理员、开发人员以及对ARM平台有兴趣的读者来说，是一份重要的参考资源，提供了关于如何管理和控制平台的关键信息，以实现高效和安全的操作。"
在使用SCP 1.0时，用户需遵循文档中的保密协议，确保在合法范围内操作，避免侵犯ARM的知识产权。此外，开发者在开发与SCP接口相关的软件时，应了解文档中列出的规范和最佳实践，以确保兼容性和互操作性。通过学习和遵循SCP v1.0，用户可以充分利用ARM平台的潜力，提升系统的稳定性和性能。
System Control and Management Interface
Page 14 of 81 Copyright © 2017 ARM Limited or its affiliates. All rights reserved. ARM DEN 0056A
Non-Confidential
the associated asynchronous command. The payload that is associated with a delayed response
includes a status error code, but might include additional data.
Notifications
Notifications have a message type of 3.
Notifications provide a mechanism for the platform to inform agents about events taking place in the
platform. Optionally, the implementation can provide information about which agent caused an event.
To this end, a notification payload carries an agent identifier, agent_id, as its first parameter. The
agent_id is an integer identifier that can be used to codify the agent that generated an event. The
agent_id uses the following rules:
• A value of 0 identifies the platform itself.
• Where implemented, agent_ids are sequential and start from one.
• Agent identifiers and their mapping to other components are platform-specific. Where
necessary, this must be described to operating system through firmware table technologies such
as FDT or ACPI.
• If agent identification is not supported, the implementation must set the agent_id to zero in
notifications.
4.1.3 Protocol discovery
This specification encompasses various protocols. However, not every protocol has to be present in an
implementation, because not every protocol is relevant for every market segment. Furthermore, the
platform chooses which protocols it exposes to a given agent. The only protocol that must be
implemented is the base protocol, which is described in section 4.2. The base protocol is used by an
agent to discover which protocols are available to it.
All protocols, whether they are generic or vendor specific, must implement three messages with
message_ids of 0x0, 0x1, and 0x2 as described in Table 4.
Table 4 Required messages
Message_id
Message
Description
0x0
PROTOCOL_VERSION
Returns the version of protocol.
0x1
PROTOCOL_ATTRIBUTES
Returns properties that are
associated with the protocol
implementation.
0x2
PROTOCOL_MESSAGE_ATTRIBUTES
Takes a message_id as a
parameter and returns
implementation details specific to
that message.
Protocols might implement additional discovery messages.
Protocol versioning uses a 32-bit unsigned integer, where the upper 16 bits are the major revision, and
the lower 16 bits are the minor revision.
The following rules apply to the version numbering:
• Higher numbers denote newer versions.
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