linux-kernel - [RFC PATCH 3/4] x86_64: mark ACPI NVS memory region

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Date:	Thu, 03 Jul 2008 10:24:36 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>
Subject: [RFC PATCH 3/4] x86_64: mark ACPI NVS memory region


x86_64: Mark ACPI NVS memory region.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
---
 arch/x86/kernel/e820_64.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Index: linux-2.6/arch/x86/kernel/e820_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820_64.c	2008-06-19 15:09:52.000000000 +0800
+++ linux-2.6/arch/x86/kernel/e820_64.c	2008-06-19 15:11:45.000000000 +0800
@@ -19,6 +19,8 @@
 #include <linux/mm.h>
 #include <linux/suspend.h>
 #include <linux/pfn.h>
+#include <linux/efi.h>
+#include <linux/acpi.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -377,6 +379,33 @@
 	}
 }
 
+#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 = round_up(ei->addr, PAGE_SIZE) >> PAGE_SHIFT;
+		end = round_down(ei->addr + ei->size, PAGE_SIZE) >> PAGE_SHIFT;
+		if (start >= end)
+			continue;
+
+		acpi_mark_nvs_region(start, end - 1);
+	}
+	return 0;
+}
+core_initcall(e820_mark_nvs_memory);
+#endif
+
 /*
  * Finds an active region in the address range from start_pfn to end_pfn and
  * returns its range in ei_startpfn and ei_endpfn for the e820 entry.


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