From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Sun, 21 Jun 2015 23:32:53 +0200
From: David du Colombier <0intro@gmail.com>
To: 9fans@9fans.net
Message-ID: <20150621233253.1d74c860@zinc.9fans.fr>
In-Reply-To: <b776c0ace02decdc6375db208bf2cacb@9netics.com>
References: <b776c0ace02decdc6375db208bf2cacb@9netics.com>
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Subject: Re: [9fans] compiling xen3 with more recent pc kernel
Topicbox-Message-UUID: 5a11bf34-ead9-11e9-9d60-3106f5b1d025

> i had to make the following changes to the kernel for xen3 to match up
> to recent labs pc kernel and to compile successfully.  can anyone
> verify the changes are correct?  (i could to a smoke test on EC2, but
> don't feel adventurous at the moment)

The evenaddr function in trap.c should be replaced by validalign:

void
validalign(uintptr addr, unsigned align)
{
	/*
	 * Plan 9 is a 32-bit O/S, and the hardware it runs on
	 * does not usually have instructions which move 64-bit
	 * quantities directly, synthesizing the operations
	 * with 32-bit move instructions. Therefore, the compiler
	 * (and hardware) usually only enforce 32-bit alignment,
	 * if at all.
	 *
	 * Take this out if the architecture warrants it.
	 */
	if(align == sizeof(vlong))
		align = sizeof(long);

	/*
	 * Check align is a power of 2, then addr alignment.
	 */
	if((align != 0 && !(align & (align-1))) && !(addr & (align-1)))
		return;
	postnote(up, 1, "sys: odd address", NDebug);
	error(Ebadarg);
	/*NOTREACHED*/
}

This is a change done by Jim McKie on 2014-05-15.

--
David du Colombier