Date: Sun, 8 Nov 2015 12:13:37 +0700 From: Рысь <lynx@...xlynx.tk> To: musl@...ts.openwall.com Subject: Re: sys/io.h lacks inb_p and outb_p on x86 On Sat, 7 Nov 2015 23:50:45 -0500 Rich Felker <dalias@...c.org> wrote: > On Sun, Nov 08, 2015 at 11:26:55AM +0700, Рысь wrote: > > x86 arch lacks inb_p and outb_p inline functions. This is required > > for memtest86+. > > > > I don't know how properly make an assembly here, so when making > > memtest I copied sys/io.h into local directory, and copied these > > functions from uClibc. > > > > I attach modified header for reference (they should go into > > bits/io.h). > > Any idea what these are intended to do? Are they documented anywhere? > > Rich I can't say much, but looking into memtest code I see they're used only for beeping a PC speaker. Comment in io.h include file of memtest says: * This file contains the definitions for the x86 IO instructions * inb/inw/inl/outb/outw/outl and the "string versions" of the same * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" * versions of the single-IO instructions (inb_p/inw_p/..). However memtest builds with assumption they're present in sys/io.h from host and io.h included with memtest does not define inb_p/outb_p in any way. I probably will go with uClibc defines, or just nop memtest beeper. -- http://lynxlynx.tk/ Power electronics made simple Unix and simple KISS C code
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