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    SubjectRe: [PATCH 12/20] x86_64: wakeup.S Misc cleanup

    > o Various cleanups. One of the main purpose of cleanups is that make
    > wakeup.S as close as possible to trampoline.S.
    > o Following are the changes
    > - Indentations for comments.
    > - Changed the gdt table to compact form and to resemble the
    > one in trampoline.S
    > - Take the jump to 32bit from real mode using ljmpl. Makes code
    > more readable.
    > - After enabling long mode, directly take a long jump for 64bit
    > mode. No need to take an extra jump to "reach_comaptibility_mode"
    > - Stack is not used after real mode. So don't load stack in
    > 32 bit mode.
    > - No need to enable PGE here.
    > - No need to do extra EFER read, anyway we trash the read contents.
    > - No need to enable system call (EFER_SCE). Anyway it will be
    > enabled when original EFER is restored.
    > - No need to set MP, ET, NE, WP, AM bits in cr0. Very soon we will
    > reload the original cr0 while restroing the processor state.
    > Signed-off-by: Eric W. Biederman <>
    > Signed-off-by: Vivek Goyal <>

    ACK, minor nitpicks:

    > + /* ??? Why I need the accessed bit set in order for this to work? */

    Yes, I'd like to know :-).

    > + .quad 0x00cf9b000000ffff # __KERNEL32_CS
    > + .quad 0x00af9b000000ffff # __KERNEL_CS
    > + .quad 0x00cf93000000ffff # __KERNEL_DS

    Can we get a comment telling us what to keep it in sync with?

    (cesky, pictures)
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