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    SubjectRe: EFI runtime-services on x86_64
    Hi Bjorn,

    On Sat, 31 Jul 2010 04:58:48 +0800
    Bjorn Helgaas <> wrote:

    > Hello Feng,
    > Can you educate me about your commit 772be899bc, "86: Make EFI RTC
    > function depend on 32bit again"?
    > It adds "#ifdef CONFIG_X86_32" to avoid using efi_get_time() and
    > efi_set_rtc_mmss(), but there's no explanation of *why* those services
    > only work on 32-bit.
    > Is this an EFI spec limitation? Do the other EFI runtime services
    > work on 64-bit, since you didn't touch them? Or do we just not use
    > any of the others?

    Commit 772be899bc, "86: Make EFI RTC function depend on 32bit again" is
    a regression fix for 7bd867d "x86: Move get/set_wallclock to x86_platform_ops".
    These 2 commits just abstract the rtc service for legacy x86 PC/EFI/Virtualiation
    kernel, and has no functional change to existing code.

    I'm not familiar with EFI, but my understanding is current EFI code in
    kernel only provides the get/set_time service for x86_32 platform.

    Cc Ying who is more familiar with EFI than me.


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