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    SubjectRe: [PATCH] i386-pda: Initialize the PDA early, before any C code runs.
    On Mon, 11 Sep 2006 15:52:49 -0700
    Jeremy Fitzhardinge <jeremy@goop.org> wrote:

    > Initialize the PDA early, before any C code runs.
    >
    > This patch makes sure the PDA is usable in head.S, before any C code
    > is run.
    >
    > On the boot CPU, this is done by using a temporary boot_pda which is
    > initialized appropriately. It is replaced with a proper PDA when the
    > proper GDT is installed.
    >
    > For secondary CPUs, the GDT and PDA are pre-allocated and initialized.
    > head.S just needs to set %gs and load the GDT.
    >
    > In the process, this removes the need for early_smp_processor_id() and
    > early_current().
    >
    > ...
    >
    > +/* Initial PDA used by boot CPU */
    > +struct i386_pda boot_pda = {
    > + ._pda = &boot_pda,
    > + .cpu_number = 0,
    > + .pcurrent = &init_task,
    > +};

    What is likely to happen if the boot CPU is not CPU #0? (iirc Voyager does
    that?)

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