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

[Joseph Cihula <joseph.cihula@linux.intel.com>]

(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@intel.com>
Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Gang Wei <gang.wei@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-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