linux-kernel - Re: [PATCH 1/2] x86: Add Isolated Memory Regions for Quark X1000

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Message-ID: <54AE9E27.2050307@nexus-software.ie>
Date:	Thu, 08 Jan 2015 15:11:35 +0000
From:	Bryan O'Donoghue <pure.logic@...us-software.ie>
To:	"Ong, Boon Leong" <boon.leong.ong@...el.com>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"dvhart@...radead.org" <dvhart@...radead.org>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"andy.shevchenko@...il.com" <andy.shevchenko@...il.com>
Subject: Re: [PATCH 1/2] x86: Add Isolated Memory Regions for Quark X1000


> Suggest to split the imr_del() into 2 functions:-
> (1) by address + size
> (2) by IMR index
> At current implementation, it does not support (2) only because it fails at
> imr_check_range().

Hi Boon Leong.

I'll have a think about that :)

Just on imr_del() though, it does support removal by way of index.

+static void __init intel_galileo_imr_init(void)
+{
+	unsigned long base  = virt_to_phys(&_text);
+	unsigned long size = virt_to_phys(&_sinittext) - base - IMR_ALIGN;
+	int i, ret;
+
+	/* Tear down all existing unlocked IMRs */
+	for (i = 0; i <= QUARK_X1000_IMR_NUM; i++)
+		imr_del(i, 0, 0);

That's what the platform code has to do for every unlocked IMR, to make 
sure there are no stale IMRs left that could conflict with the EFI 
memory map !

--
BOD




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