From ae261868658773538ddda829c50224e5851c2342 Mon Sep 17 00:00:00 2001
From: Jack Steiner <steiner@sgi.com>
Date: Fri, 28 Mar 2008 14:12:06 -0500
Subject: [PATCH] x86: add functions to determine if platform is a UV platform

Add functions that can be used to determine if an x86_64
system is a SGI "UV" system. UV systems come in 3 types and
are identified by the OEM ID in the MADT.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/kernel/acpi/boot.c  |  4 +---
 arch/x86/kernel/genapic_64.c | 25 +++++++++++++++++++++++++
 include/asm-x86/genapic_32.h |  5 +++++
 include/asm-x86/genapic_64.h |  5 +++++
 4 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index e277c370246d..05878ac934db 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -56,9 +56,7 @@ EXPORT_SYMBOL(acpi_disabled);
 #ifdef	CONFIG_X86_64
 
 #include <asm/proto.h>
-
-static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
-
+#include <asm/genapic.h>
 
 #else				/* X86 */
 
diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c
index 4ae7b6440260..c873f60c74a6 100644
--- a/arch/x86/kernel/genapic_64.c
+++ b/arch/x86/kernel/genapic_64.c
@@ -33,6 +33,8 @@ EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
 
 struct genapic __read_mostly *genapic = &apic_flat;
 
+static enum uv_system_type uv_system_type;
+
 /*
  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  */
@@ -64,3 +66,26 @@ void send_IPI_self(int vector)
 {
 	__send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
 }
+
+int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+	if (!strcmp(oem_id, "SGI")) {
+		if (!strcmp(oem_table_id, "UVL"))
+			uv_system_type = UV_LEGACY_APIC;
+		else if (!strcmp(oem_table_id, "UVX"))
+			uv_system_type = UV_X2APIC;
+		else if (!strcmp(oem_table_id, "UVH"))
+			uv_system_type = UV_NON_UNIQUE_APIC;
+	}
+	return 0;
+}
+
+enum uv_system_type get_uv_system_type(void)
+{
+	return uv_system_type;
+}
+
+int is_uv_system(void)
+{
+	return uv_system_type != UV_NONE;
+}
diff --git a/include/asm-x86/genapic_32.h b/include/asm-x86/genapic_32.h
index 5fa893dce729..f1b96932746b 100644
--- a/include/asm-x86/genapic_32.h
+++ b/include/asm-x86/genapic_32.h
@@ -114,4 +114,9 @@ struct genapic {
 
 extern struct genapic *genapic;
 
+enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
+#define get_uv_system_type()		UV_NONE
+#define is_uv_system()			0
+
+
 #endif
diff --git a/include/asm-x86/genapic_64.h b/include/asm-x86/genapic_64.h
index d7e516ccbaa4..914815c28ae5 100644
--- a/include/asm-x86/genapic_64.h
+++ b/include/asm-x86/genapic_64.h
@@ -33,5 +33,10 @@ extern struct genapic *genapic;
 
 extern struct genapic apic_flat;
 extern struct genapic apic_physflat;
+extern int acpi_madt_oem_check(char *, char *);
+
+enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
+extern enum uv_system_type get_uv_system_type(void);
+extern int is_uv_system(void);
 
 #endif