[architecture]-ARMV8的RAS Extension(Reliability、Availability、Serviceability)介绍
1、RAS概念
RAS擴展系統寄存器,在ARM 可靠性(Reliability)、可用性(Availability)、可服務性(Serviceability)定義ARMv8規范,用于ARMv8- a架構配置文件。RAS擴展是對ARMv8.2體系結構的強制擴展,也是對ARMv8.0和ARMv8.1體系結構的可選擴展。即:
- 可靠性描述系統是否能夠正確工作。
- 可使用性描述系統能夠正確工作的時間。
- 可服務性描述系統的容錯性,即出現錯誤之后恢復的難易程度。
2、RAS的相關寄存器
注意:ID_AA64PFR0_EL1.RAS in AArch64 state, and ID_PFR0.RAS in AArch32 state, indicate whether the RAS Extension is implemented
3、RAS在ATF中應用
Starting with ARMv8.2 architecture extension, many RAS features have been introduced to the Arm architecture. With RAS features implemented, various components of the system may use one of the asynchronous exceptions to signal error conditions to PEs. These error conditions are of critical nature, and it’s imperative that corrective or remedial actions are taken at the earliest opportunity. Therefore, a Firmware-first Handling approach is generally followed in response to RAS events in the system
隨著RAS的啟用,系統的各種組件可以使用一種異步異常向PEs發送錯誤條件信號。這些錯誤條件具有關鍵性質,必須盡早采取糾正或補救措施。因此,在響應系統中的RAS事件時,通常遵循Firmware-first處理方法。
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