ARM進(jìn)入STR時，CP15有保存嗎？

coralonland

請問各位，在power management中的suspend to ram時，ARM的CP15需要保存嗎？我看__cpu_suspend()中好像沒有此內(nèi)容。如果不保存的話，豈不是在CPU掉電時都丟了？

Tinnal

suspend to ram本來的不應(yīng)該掉電呀，不是嗎？
又不是suspend to disk.

coralonland

STR時，CPU要掉電的吧。

Tinnal

回復(fù) 3# coralonland

看了一下X86是關(guān)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這塊不清楚。剛才看了下代碼，和具體的CPU強(qiáng)相關(guān)。