linux-kernel - [linux-next] [PATCH V2 3/4] ACPI: mark ACPI NVS memory region

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Date:	Fri, 11 Jul 2008 13:29:12 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@...e.cz>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>
Subject: [linux-next] [PATCH V2 3/4] ACPI: mark ACPI NVS memory region


Mark ACPI NVS memory region during startup.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
 arch/x86/kernel/e820.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Index: linux-next/arch/x86/kernel/e820.c
===================================================================
--- linux-next.orig/arch/x86/kernel/e820.c	2008-07-11 11:44:54.000000000 +0800
+++ linux-next/arch/x86/kernel/e820.c	2008-07-11 11:52:22.000000000 +0800
@@ -19,6 +19,8 @@
 #include <linux/mm.h>
 #include <linux/pfn.h>
 #include <linux/suspend.h>
+#include <linux/efi.h>
+#include <linux/acpi.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -623,6 +625,33 @@
 }
 #endif
 
+#ifdef CONFIG_HIBERNATION
+/* Mark ACPI NVS region, so that OS can save/restore it during hibernation */
+static int __init e820_mark_nvs_memory(void)
+{
+	int i;
+
+	if (efi_enabled)
+		return 0;
+
+	for (i = 0; i < e820.nr_map; i++) {
+		struct e820entry *ei = &e820.map[i];
+		unsigned long start, end;
+
+		if (ei->type != E820_NVS)
+			continue;
+		start = PFN_UP(ei->addr);
+		end = PFN_DOWN(ei->addr + ei->size);
+		if (start >= end)
+			continue;
+
+		acpi_mark_nvs_region(start, end - 1);
+	}
+	return 0;
+}
+core_initcall(e820_mark_nvs_memory);
+#endif
+
 /*
  * Early reserved memory areas.
  */


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