Messages in this thread | | | Date | Thu, 28 Mar 2019 15:52:26 +0200 | From | Andy Shevchenko <> | Subject | Re: [PATCH v2 2/7] x86/boot: Introduce helpers for serial I/O |
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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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