[architecture]-ARMV8的RAS Extension(Reliability、Availability、Serviceability)介绍
1、RAS概念
RAS擴(kuò)展系統(tǒng)寄存器,在ARM 可靠性(Reliability)、可用性(Availability)、可服務(wù)性(Serviceability)定義ARMv8規(guī)范,用于ARMv8- a架構(gòu)配置文件。RAS擴(kuò)展是對(duì)ARMv8.2體系結(jié)構(gòu)的強(qiáng)制擴(kuò)展,也是對(duì)ARMv8.0和ARMv8.1體系結(jié)構(gòu)的可選擴(kuò)展。即:
- 可靠性描述系統(tǒng)是否能夠正確工作。
- 可使用性描述系統(tǒng)能夠正確工作的時(shí)間。
- 可服務(wù)性描述系統(tǒng)的容錯(cuò)性,即出現(xiàn)錯(cuò)誤之后恢復(fù)的難易程度。
2、RAS的相關(guān)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(yīng)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(tǒng)的各種組件可以使用一種異步異常向PEs發(fā)送錯(cuò)誤條件信號(hào)。這些錯(cuò)誤條件具有關(guān)鍵性質(zhì),必須盡早采取糾正或補(bǔ)救措施。因此,在響應(yīng)系統(tǒng)中的RAS事件時(shí),通常遵循Firmware-first處理方法。
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