linux-kernel - [RFC][PATCH 1/3] TXT: ACPI AddressRangeUnusuable support

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Date:	Tue, 7 Oct 2008 13:34:47 -0700
From:	"Cihula, Joseph" <joseph.cihula@...el.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	"Wang, Shane" <shane.wang@...el.com>,
	"Wei, Gang" <gang.wei@...el.com>,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	"Chris Wright" <chrisw@...hat.com>,
	"Jan Beulich" <jbeulich@...ell.com>, <mingo@...e.hu>,
	<tytso@....edu>
Subject: [RFC][PATCH 1/3] TXT: ACPI AddressRangeUnusuable support

See attached commit message (w/ patch), copied below:

Add support for the E820_UNUSABLE memory type, which is defined in
Revision 3.0b (Oct.  10, 2006) of the ACPI Specification on p.  394
Table
14-1:

  AddressRangeUnusuable This range of address contains memory in which
  errors have been detected.  This range must not be used by the OSPM.

Signed-off-by: Joseph Cihula <joseph.cihula@...el.com>
Signed-off-by: Shane Wang <shane.wang@...el.com>
Signed-off-by: Gang Wei <gang.wei@...el.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 arch/x86/kernel/e820.c |    4 ++++
 include/asm-x86/e820.h |    1 +
 2 files changed, 5 insertions(+)

diff -puN
arch/x86/kernel/e820.c~acpi-add-support-for-addressrangeunusuable-acpi-m
emory-type arch/x86/kernel/e820.c
---
a/arch/x86/kernel/e820.c~acpi-add-support-for-addressrangeunusuable-acpi
-memory-type
+++ a/arch/x86/kernel/e820.c
@@ -148,6 +148,9 @@ void __init e820_print_map(char *who)
 		case E820_NVS:
 			printk(KERN_CONT "(ACPI NVS)\n");
 			break;
+		case E820_UNUSABLE:
+			printk("(unusable)\n");
+			break;
 		default:
 			printk(KERN_CONT "type %u\n", e820.map[i].type);
 			break;
@@ -1260,6 +1263,7 @@ static inline const char *e820_type_to_s
 	case E820_RAM:	return "System RAM";
 	case E820_ACPI:	return "ACPI Tables";
 	case E820_NVS:	return "ACPI Non-volatile Storage";
+	case E820_UNUSABLE:	return "Unusable memory";
 	default:	return "reserved";
 	}
 }
diff -puN
include/asm-x86/e820.h~acpi-add-support-for-addressrangeunusuable-acpi-m
emory-type include/asm-x86/e820.h
---
a/include/asm-x86/e820.h~acpi-add-support-for-addressrangeunusuable-acpi
-memory-type
+++ a/include/asm-x86/e820.h
@@ -43,6 +43,7 @@
 #define E820_RESERVED	2
 #define E820_ACPI	3
 #define E820_NVS	4
+#define E820_UNUSABLE	5
 
 /* reserved RAM used by kernel itself */
 #define E820_RESERVED_KERN        128


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