Hello, On Nov 18, 2007 11:12 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote: > Hi, > > On Sunday, 18 of November 2007, Francis Moreau wrote: > > Hello, > > > > I'm trying to get an idea on how suspend works on Linux. I already looked at > > Documentation/power, but I'm clueless about x86 architectures. They don't > > seem to define any suspend ops. > > Yes, they do, via ACPI. Please see drivers/acpi/sleep/main.c . > > > Can anyone give me some pointers or some hints, I'd like to look at the > > low level part of the suspend on these architectures also I'd like to know > > what kind of events wake up the system once it's suspended. I guess > > interrupts are used but which ones exactly. > > This also is controlled by ACPI. The ACPI platform firmware handles the > wake-up events and transfers control to the kernel by jumping to an address > specified before the suspend. > > > Also I'm wondering how jiffies or system clock are updated correctly after > > resuming. > > AFAICS, we use the pre-suspend value of jiffies. The generic clocksource > timekeeping is handled by timekeeping_resume() in kernel/time/timekeeping.c . > Thanks the hints, I'm going to take a look to ACPI then. -- Francis _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
