Merge branch 'x86-bios-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-bios-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, bios: Make the x86 early memory reservation a kernel option
  x86, bios: By default, reserve the low 64K for all BIOSes

1 files changed, 28 insertions, 19 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a1bd569f6c5a..b8676498d8df 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1341,25 +1341,34 @@ config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
           Set whether the default state of memory_corruption_check is
           on or off.
 
-config X86_RESERVE_LOW_64K
-        bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
-        default y
-        ---help---
-          Reserve the first 64K of physical RAM on BIOSes that are known
-          to potentially corrupt that memory range. A numbers of BIOSes are
-          known to utilize this area during suspend/resume, so it must not
-          be used by the kernel.
-
-          Set this to N if you are absolutely sure that you trust the BIOS
-          to get all its memory reservations and usages right.
-
-          If you have doubts about the BIOS (e.g. suspend/resume does not
-          work or there's kernel crashes after certain hardware hotplug
-          events) and it's not AMI or Phoenix, then you might want to enable
-          X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
-          corruption patterns.
-
-          Say Y if unsure.
+config X86_RESERVE_LOW
+        int "Amount of low memory, in kilobytes, to reserve for the BIOS"
+        default 64
+        range 4 640
+        ---help---
+          Specify the amount of low memory to reserve for the BIOS.
+
+          The first page contains BIOS data structures that the kernel
+          must not use, so that page must always be reserved.
+
+          By default we reserve the first 64K of physical RAM, as a
+          number of BIOSes are known to corrupt that memory range
+          during events such as suspend/resume or monitor cable
+          insertion, so it must not be used by the kernel.
+
+          You can set this to 4 if you are absolutely sure that you
+          trust the BIOS to get all its memory reservations and usages
+          right.  If you know your BIOS have problems beyond the
+          default 64K area, you can set this to 640 to avoid using the
+          entire low memory range.
+
+          If you have doubts about the BIOS (e.g. suspend/resume does
+          not work or there's kernel crashes after certain hardware
+          hotplug events) then you might want to enable
+          X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
+          typical corruption patterns.
+
+          Leave this to the default value of 64 if you are unsure.
 
 config MATH_EMULATION
         bool