Re: [PATCH v2 2/7] x86/boot: Introduce helpers for serial I/O

[Borislav Petkov]

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)
{
	if (early_serial_do_mmio) {
		asm volatile("movb %1,%0" : "=q" (v) : "m" (*(volatile u8 __force *)addr));

		return v;
	} else {
		 return inb(addr + offset);
	}
}

-- 
Regards/Gruss,
    Boris.

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