x86: reserve low 64K on AMI and Phoenix BIOS boxen

commit 1e22436eba84edfec9c25e5a25d09062c4f91ca9 upstream

there's multiple reports about suspend/resume related low memory
corruption in this bugzilla:

  http://bugzilla.kernel.org/show_bug.cgi?id=11237

the common pattern is that the corruption is caused by the BIOS,
and that it affects some portion of the first 64K of physical RAM.

So add a DMI quirk

This will waste 64K RAM on 'good' systems too, but without knowing
the exact nature of this BIOS memory corruption this is the safest
approach.

This might as well solve a wide range of suspend/resume breakages
under Linux.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index e9fc6e9317537445a0028f95467cd17135e65f96..b925428e2d1ad413ccbca9be0f5bd429dd27110f 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -581,10 +581,10 @@ struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;
 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
 {
        printk(KERN_NOTICE
-               "%s detected: BIOS corrupts 0xc000, working it around.\n",
+               "%s detected: BIOS may corrupt low RAM, working it around.\n",
                d->ident);
 
-       reserve_early(0xc000, 0xc400, "BIOS quirk");
+       reserve_early(0x0, 0x10000, "BIOS quirk");
 
        return 0;
 }
@@ -598,6 +598,13 @@ static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
                        DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
                },
        },
+       {
+               .callback = dmi_low_memory_corruption,
+               .ident = "Phoenix BIOS",
+               .matches = {
+                       DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
+               },
+       },
        {}
 };