linux-kernel - [PATCH] Always use 64 bit addresses for the firmware memory map

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Date:	Wed, 12 Nov 2008 20:44:49 +0100
From:	Bernhard Walle <bwalle@...e.de>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	Bernhard Walle <bwalle@...e.de>
Subject: [PATCH] Always use 64 bit addresses for the firmware memory map

I had a problem that on i386 without PAE enabled the firmware memory map was
wrong because a 64 bit address has been truncated:

        0000000000000000-000000000009f400 (System RAM)
        000000000009f400-00000000000a0000 (reserved)
        00000000fec10000-00000000fec11000 (reserved)
        00000000fec20000-00000000fec21000 (reserved)
        00000000fee00000-00000000fee10000 (reserved)
        00000000ff800000-0000000100000000 (reserved)
 --->   0000000000000000-00000000fffff000 (System RAM)  <---
        00000000000f0000-0000000000100000 (reserved)
        0000000000100000-00000000f57fa000 (System RAM)
        00000000f57fa000-00000000f5800000 (ACPI Tables)
        00000000fdc00000-00000000fdc01000 (reserved)
        00000000fdc10000-00000000fdc11000 (reserved)
        00000000fdc20000-00000000fdc21000 (reserved)
        00000000fdc30000-00000000fdc31000 (reserved)
        00000000fec00000-00000000fec01000 (reserved)

Just always using 64 bit is the most sane approach in my opinion.


Signed-off-by: Bernhard Walle <bwalle@...e.de>
---
 drivers/firmware/memmap.c    |   17 +++++++----------
 include/linux/firmware-map.h |   12 +++++-------
 2 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/drivers/firmware/memmap.c b/drivers/firmware/memmap.c
index 3bf8ee1..010afde 100644
--- a/drivers/firmware/memmap.c
+++ b/drivers/firmware/memmap.c
@@ -31,8 +31,8 @@
  * information is necessary as for the resource tree.
  */
 struct firmware_map_entry {
-	resource_size_t		start;	/* start of the memory range */
-	resource_size_t		end;	/* end of the memory range (incl.) */
+	uint64_t		start;	/* start of the memory range */
+	uint64_t		end;	/* end of the memory range (incl.) */
 	const char		*type;	/* type of the memory range */
 	struct list_head	list;	/* entry for the linked list */
 	struct kobject		kobj;   /* kobject for each entry */
@@ -101,7 +101,7 @@ static LIST_HEAD(map_entries);
  * Common implementation of firmware_map_add() and firmware_map_add_early()
  * which expects a pre-allocated struct firmware_map_entry.
  **/
-static int firmware_map_add_entry(resource_size_t start, resource_size_t end,
+static int firmware_map_add_entry(uint64_t start, uint64_t end,
 				  const char *type,
 				  struct firmware_map_entry *entry)
 {
@@ -132,8 +132,7 @@ static int firmware_map_add_entry(resource_size_t start, resource_size_t end,
  *
  * Returns 0 on success, or -ENOMEM if no memory could be allocated.
  **/
-int firmware_map_add(resource_size_t start, resource_size_t end,
-		     const char *type)
+int firmware_map_add(uint64_t start, uint64_t end, const char *type)
 {
 	struct firmware_map_entry *entry;
 
@@ -157,7 +156,7 @@ int firmware_map_add(resource_size_t start, resource_size_t end,
  *
  * Returns 0 on success, or -ENOMEM if no memory could be allocated.
  **/
-int __init firmware_map_add_early(resource_size_t start, resource_size_t end,
+int __init firmware_map_add_early(uint64_t start, uint64_t end,
 				  const char *type)
 {
 	struct firmware_map_entry *entry;
@@ -175,14 +174,12 @@ int __init firmware_map_add_early(resource_size_t start, resource_size_t end,
 
 static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "0x%llx\n",
-		(unsigned long long)entry->start);
+	return snprintf(buf, PAGE_SIZE, "0x%llx\n", entry->start);
 }
 
 static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "0x%llx\n",
-		(unsigned long long)entry->end);
+	return snprintf(buf, PAGE_SIZE, "0x%llx\n", entry->end);
 }
 
 static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
diff --git a/include/linux/firmware-map.h b/include/linux/firmware-map.h
index 6e199c8..209a27a 100644
--- a/include/linux/firmware-map.h
+++ b/include/linux/firmware-map.h
@@ -24,21 +24,19 @@
  */
 #ifdef CONFIG_FIRMWARE_MEMMAP
 
-int firmware_map_add(resource_size_t start, resource_size_t end,
-		     const char *type);
-int firmware_map_add_early(resource_size_t start, resource_size_t end,
-			   const char *type);
+int firmware_map_add(uint64_t start, uint64_t end, const char *type);
+int firmware_map_add_early(uint64_t start, uint64_t end, const char *type);
 
 #else /* CONFIG_FIRMWARE_MEMMAP */
 
-static inline int firmware_map_add(resource_size_t start, resource_size_t end,
+static inline int firmware_map_add(uint64_t start, uint64_t end,
 				   const char *type)
 {
 	return 0;
 }
 
-static inline int firmware_map_add_early(resource_size_t start,
-					 resource_size_t end, const char *type)
+static inline int firmware_map_add_early(uint64_t start, uint64_t end,
+					 const char *type)
 {
 	return 0;
 }
-- 
1.6.0.2

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