ARM进入STR时，CP15有保存吗？

coralonland

请问各位，在power management中的suspend to ram时，ARM的CP15需要保存吗？我看__cpu_suspend()中好像没有此内容。如果不保存的话，岂不是在CPU掉电时都丢了？

Tinnal

suspend to ram本来的不应该掉电呀，不是吗？
又不是suspend to disk.

coralonland

STR时，CPU要掉电的吧。

Tinnal

回复 3# coralonland

看了一下X86是关CPU的。

The ACPI specifications defines the following so-called "global states" -- from Wikipedia ACPI
G1 Sleeping subdivides into the four states S1 through S4.
S1: The CPU(s) stop(s) executing instructions.
S2: The CPU is powered off.
S3: Suspend to RAM.
S4: Suspend to disk or hibernate.
G2 (S5) Soft off Almost the same as G3 but computer can "wake" from input from the keyboard, clock, modem, LAN, or USB device.
G3 Mechanical off


ARM这块不清楚。刚才看了下代码，和具体的CPU强相关。