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    SubjectRe: [PATCH v2 2/7] x86/boot: Introduce helpers for serial I/O
    On Thu, Mar 28, 2019 at 02:28:55PM +0100, Borislav Petkov wrote:
    > On Thu, Mar 28, 2019 at 03:11:40PM +0200, Andy Shevchenko wrote:
    > > Any idea how it can be done?
    >
    > Like this?
    >
    > static u8 serial_inb(unsigned long addr, int offset)

    It's not a generic serial_in()...

    > {
    > if (early_serial_do_mmio) {
    > asm volatile("movb %1,%0" : "=q" (v) : "m" (*(volatile u8 __force *)addr));
    >
    > return v;
    > } else {
    > return inb(addr + offset);
    > }
    > }

    What about mmio32 as next step?

    Do we have to "fix" earlyprintk implementation in kernel to do the same?

    --
    With Best Regards,
    Andy Shevchenko


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