On Thu, Aug 24, 2006 at 09:37:39AM +0000, moreau francis wrote:
> Russell King wrote:
> > On Thu, Aug 24, 2006 at 08:44:25AM +0000, moreau francis wrote:
> >> Mips one seems to be a copy and paste of arm one and both of them
> >> have removed all APM bios stuff orginally part of i386 implementation.
> >
> > The BIOS stuff makes no sense on ARM - there isn't a BIOS to do anything
> > with.
>
> I haven't said that it has been widely/wrongly removed...
ROTFL! No, you were stating that the APM bios stuff was removed, and
I gave the reason for it. Why are you now objecting to my explaination?
> >> It doesn't seem that APM is something really stable and finished.
> >
> > It's complete. It's purpose is to provide the interface to userland so
> > that programs know about suspend/resume events, and can initiate suspends.
> > Eg, the X server.
> >
>
> Is there something specific to ARM in this implementation ? I don't think
> so and it's surely the reason why MIPS did copy it with almost no changes.
MIPS copied it because presumably it was useful for them.
> I understand that ARM implementation has been the first one but maybe now
> why not making it the common power management for embedded system that
> could be used by all arches which need it ?
It could well become a common interface. But it is NOT power management
infrastructure. It is merely a _userland_ interface. Nothing more. It
does not do anything other than that.
> BTW, why has apm_cpu_idle() logic been removed from ARM implementation ?
This APM is just a userland interface. It has nothing to do with actual
power management. CPU idling is handled entirely differently on ARM.
> > The power management really comes from the Linux drivers themselves,
> > which are written to peripherals off when they're not in use. The other
> > power saving comes from things like cpufreq - again, nothing to do with
> > the magical "APM" or "ACPI" terms.
>
> BTW why is it still called "APM" on ARM ?
That's what the userland interface is called on x86. We could've called it
apm_userland_interface_emulation_and_not_a_power_management_infrastructure.c
but although that clearly states what it is, it would've been far too long
a name. 8)
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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