Hi Linus,
Please pull:
git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup.git for-linus
H. Peter Anvin (1):
[x86 setup] Handle case of improperly terminated E820 chain
arch/i386/boot/memory.c | 30 +++++++++++++++++++++++-------
1 files changed, 23 insertions(+), 7 deletions(-)
[Log messages and full diffs follow]
commit 2efa33f81ef56e7700c09a3d8a881c96692149e5
Author: H. Peter Anvin <[email protected]>
Date: Wed Sep 26 14:11:43 2007 -0700
[x86 setup] Handle case of improperly terminated E820 chain
At least one system (a Geode system with a Digital Logic BIOS) has
been found which suddenly stops reporting the SMAP signature when
reading the E820 memory chain. We can't know what, exactly, broke in
the BIOS, so if we detect this situation, declare the E820 data
unusable and fall back to E801.
Also, revert to original behavior of always probing all memory
methods; that way all the memory information is available to the
kernel.
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: Jordan Crouse <[email protected]>
Cc: Joerg Pommnitz <[email protected]>
diff --git a/arch/i386/boot/memory.c b/arch/i386/boot/memory.c
index 1a2e62d..bccaa1c 100644
--- a/arch/i386/boot/memory.c
+++ b/arch/i386/boot/memory.c
@@ -20,6 +20,7 @@
static int detect_memory_e820(void)
{
+ int count = 0;
u32 next = 0;
u32 size, id;
u8 err;
@@ -33,14 +34,24 @@ static int detect_memory_e820(void)
"=m" (*desc)
: "D" (desc), "a" (0xe820));
- if (err || id != SMAP)
+ /* Some BIOSes stop returning SMAP in the middle of
+ the search loop. We don't know exactly how the BIOS
+ screwed up the map at that point, we might have a
+ partial map, the full map, or complete garbage, so
+ just return failure. */
+ if (id != SMAP) {
+ count = 0;
break;
+ }
- boot_params.e820_entries++;
+ if (err)
+ break;
+
+ count++;
desc++;
- } while (next && boot_params.e820_entries < E820MAX);
+ } while (next && count < E820MAX);
- return boot_params.e820_entries;
+ return boot_params.e820_entries = count;
}
static int detect_memory_e801(void)
@@ -89,11 +100,16 @@ static int detect_memory_88(void)
int detect_memory(void)
{
+ int err = -1;
+
if (detect_memory_e820() > 0)
- return 0;
+ err = 0;
if (!detect_memory_e801())
- return 0;
+ err = 0;
+
+ if (!detect_memory_88())
+ err = 0;
- return detect_memory_88();
+ return err;
}
I just tried 2.6.23-rc8 with the patch applied. Works fine here, so my very first
Acked-by: Joerg Pommnitz <[email protected]>
for whatever it's worth, since it is already in Linus' tree.
Thanks to Peter and Jordan for taking the interest and time to track
this one down and fix it.
--
Regards
Joerg
----- Urspr?ngliche Mail ----
Von: H. Peter Anvin <[email protected]>
An: Linus Torvalds <[email protected]>
CC: Linux Kernel Mailing List <[email protected]>; Jordan Crouse <[email protected]>; Joerg Pommnitz <[email protected]>
Gesendet: Donnerstag, den 27. September 2007, 00:27:20 Uhr
Betreff: [GIT PULL] Workaround for broken Geode E820 BIOS
Hi Linus,
Please pull:
git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup.git for-linus
H. Peter Anvin (1):
[x86 setup] Handle case of improperly terminated E820 chain
arch/i386/boot/memory.c | 30 +++++++++++++++++++++++-------
1 files changed, 23 insertions(+), 7 deletions(-)
[Log messages and full diffs follow]
commit 2efa33f81ef56e7700c09a3d8a881c96692149e5
Author: H. Peter Anvin <[email protected]>
Date: Wed Sep 26 14:11:43 2007 -0700
[x86 setup] Handle case of improperly terminated E820 chain
At least one system (a Geode system with a Digital Logic BIOS) has
been found which suddenly stops reporting the SMAP signature when
reading the E820 memory chain. We can't know what, exactly, broke in
the BIOS, so if we detect this situation, declare the E820 data
unusable and fall back to E801.
Also, revert to original behavior of always probing all memory
methods; that way all the memory information is available to the
kernel.
Signed-off-by: H. Peter Anvin <[email protected]>
Cc: Jordan Crouse <[email protected]>
Cc: Joerg Pommnitz <[email protected]>
diff --git a/arch/i386/boot/memory.c b/arch/i386/boot/memory.c
index 1a2e62d..bccaa1c 100644
--- a/arch/i386/boot/memory.c
+++ b/arch/i386/boot/memory.c
@@ -20,6 +20,7 @@
static int detect_memory_e820(void)
{
+ int count = 0;
u32 next = 0;
u32 size, id;
u8 err;
@@ -33,14 +34,24 @@ static int detect_memory_e820(void)
"=m" (*desc)
: "D" (desc), "a" (0xe820));
- if (err || id != SMAP)
+ /* Some BIOSes stop returning SMAP in the middle of
+ the search loop. We don't know exactly how the BIOS
+ screwed up the map at that point, we might have a
+ partial map, the full map, or complete garbage, so
+ just return failure. */
+ if (id != SMAP) {
+ count = 0;
break;
+ }
- boot_params.e820_entries++;
+ if (err)
+ break;
+
+ count++;
desc++;
- } while (next && boot_params.e820_entries < E820MAX);
+ } while (next && count < E820MAX);
- return boot_params.e820_entries;
+ return boot_params.e820_entries = count;
}
static int detect_memory_e801(void)
@@ -89,11 +100,16 @@ static int detect_memory_88(void)
int detect_memory(void)
{
+ int err = -1;
+
if (detect_memory_e820() > 0)
- return 0;
+ err = 0;
if (!detect_memory_e801())
- return 0;
+ err = 0;
+
+ if (!detect_memory_88())
+ err = 0;
- return detect_memory_88();
+ return err;
}
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