linux-kernel - [PATCH 05/17] x86: ifdef 32-bit specific setup in init_memory

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Date:	Thu,  5 Mar 2009 14:54:56 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	mingo@...e.hu
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 05/17] x86: ifdef 32-bit specific setup in init_memory_mapping()

Impact: cleanup

Enabling NX, PSE, and PGE are only required on 32-bit so ifdef them in both
versions of the function.

Cc: Yinghai Lu <yinghai@...nel.org>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 arch/x86/mm/init_32.c |    2 ++
 arch/x86/mm/init_64.c |   18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index cfc68d6..eb98cb9 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -948,6 +948,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 	use_gbpages = direct_gbpages;
 #endif
 
+#ifdef CONFIG_X86_32
 #ifdef CONFIG_X86_PAE
 	set_nx();
 	if (nx_enabled)
@@ -963,6 +964,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 		set_in_cr4(X86_CR4_PGE);
 		__supported_pte_mask |= _PAGE_GLOBAL;
 	}
+#endif
 
 	if (use_gbpages)
 		page_size_mask |= 1 << PG_LEVEL_1G;
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 151e5ba..c3c0be5 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -712,6 +712,24 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 	use_gbpages = direct_gbpages;
 #endif
 
+#ifdef CONFIG_X86_32
+#ifdef CONFIG_X86_PAE
+	set_nx();
+	if (nx_enabled)
+		printk(KERN_INFO "NX (Execute Disable) protection: active\n");
+#endif
+
+	/* Enable PSE if available */
+	if (cpu_has_pse)
+		set_in_cr4(X86_CR4_PSE);
+
+	/* Enable PGE if available */
+	if (cpu_has_pge) {
+		set_in_cr4(X86_CR4_PGE);
+		__supported_pte_mask |= _PAGE_GLOBAL;
+	}
+#endif
+
 	if (use_gbpages)
 		page_size_mask |= 1 << PG_LEVEL_1G;
 	if (use_pse)
-- 
1.5.4.3

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