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

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Message-ID: <48EBF352.6080601@linux.intel.com>
Date:	Tue, 07 Oct 2008 16:40:02 -0700
From:	Joseph Cihula <joseph.cihula@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
CC:	shane.wang@...el.com, gang.wei@...el.com, arjan@...ux.intel.com,
	asit.k.mallick@...el.com, jun.nakajima@...el.com,
	chrisw@...s-sol.org, jbeulich@...ell.com, mingo@...e.hu,
	tytso@....edu, joseph.cihula@...el.com
Subject: Re: [RFC][PATCH 1/3] TXT: ACPI AddressRangeUnusuable support

(still managed to lose the tabs--let's try one more time ;-( )

(re-posted with apologies for formatting and email addresses)

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-memory-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-memory-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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