[ARM] 5222/1: Allow configuring user:kernel split via Kconfig

This patch adds a config option (CONFIG_VMSPLIT_*) to allow choosing
between 3:1, 2:2 and 1:3 user:kernel memory splits.

Tested-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c6b248d19c79..4eb816c4df7d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -311,6 +311,7 @@ config ARCH_IOP13XX
         select PLAT_IOP
         select PCI
         select ARCH_SUPPORTS_MSI
+        select VMSPLIT_1G
         help
           Support for Intel's IOP13XX (XScale) family of processors.
 
@@ -739,6 +740,29 @@ config SMP
 
           If you don't know what to do here, say N.
 
+choice
+        prompt "Memory split"
+        default VMSPLIT_3G
+        help
+          Select the desired split between kernel and user memory.
+
+          If you are not absolutely sure what you are doing, leave this
+          option alone!
+
+        config VMSPLIT_3G
+                bool "3G/1G user/kernel split"
+        config VMSPLIT_2G
+                bool "2G/2G user/kernel split"
+        config VMSPLIT_1G
+                bool "1G/3G user/kernel split"
+endchoice
+
+config PAGE_OFFSET
+        hex
+        default 0x40000000 if VMSPLIT_1G
+        default 0x80000000 if VMSPLIT_2G
+        default 0xC0000000
+
 config NR_CPUS
         int "Maximum number of CPUs (2-32)"
         range 2 32