[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>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c6b248d..4eb816c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -311,6 +311,7 @@
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 @@
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
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index bf7c737..7e8d22f 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -13,30 +13,27 @@
#ifndef __ASM_ARM_MEMORY_H
#define __ASM_ARM_MEMORY_H
+#include <linux/compiler.h>
+#include <linux/const.h>
+#include <mach/memory.h>
+#include <asm/sizes.h>
+
/*
* Allow for constants defined here to be used from assembly code
* by prepending the UL suffix only with actual C code compilation.
*/
-#ifndef __ASSEMBLY__
-#define UL(x) (x##UL)
-#else
-#define UL(x) (x)
-#endif
-
-#include <linux/compiler.h>
-#include <mach/memory.h>
-#include <asm/sizes.h>
+#define UL(x) _AC(x, UL)
#ifdef CONFIG_MMU
-#ifndef TASK_SIZE
/*
+ * PAGE_OFFSET - the virtual address of the start of the kernel image
* TASK_SIZE - the maximum size of a user space task.
* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
*/
-#define TASK_SIZE UL(0xbf000000)
-#define TASK_UNMAPPED_BASE UL(0x40000000)
-#endif
+#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
+#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
+#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
/*
* The maximum size of a 26-bit user space task.
@@ -44,13 +41,6 @@
#define TASK_SIZE_26 UL(0x04000000)
/*
- * Page offset: 3GB
- */
-#ifndef PAGE_OFFSET
-#define PAGE_OFFSET UL(0xc0000000)
-#endif
-
-/*
* The module space lives between the addresses given by TASK_SIZE
* and PAGE_OFFSET - it must be within 32MB of the kernel text.
*/
diff --git a/arch/arm/mach-footbridge/include/mach/memory.h b/arch/arm/mach-footbridge/include/mach/memory.h
index e9cae99..6ae2f1a 100644
--- a/arch/arm/mach-footbridge/include/mach/memory.h
+++ b/arch/arm/mach-footbridge/include/mach/memory.h
@@ -42,10 +42,6 @@
#endif
-/* Task size and page offset at 3GB */
-#define TASK_SIZE UL(0xbf000000)
-#define PAGE_OFFSET UL(0xc0000000)
-
/*
* Cache flushing area.
*/
@@ -56,12 +52,6 @@
*/
#define PHYS_OFFSET UL(0x00000000)
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's.
- */
-#define TASK_UNMAPPED_BASE ((TASK_SIZE + 0x01000000) / 3)
-
#define FLUSH_BASE_PHYS 0x50000000
#endif
diff --git a/arch/arm/mach-iop13xx/include/mach/memory.h b/arch/arm/mach-iop13xx/include/mach/memory.h
index e8b59d8..a74b027 100644
--- a/arch/arm/mach-iop13xx/include/mach/memory.h
+++ b/arch/arm/mach-iop13xx/include/mach/memory.h
@@ -7,9 +7,6 @@
* Physical DRAM offset.
*/
#define PHYS_OFFSET UL(0x00000000)
-#define TASK_SIZE UL(0x3f000000)
-#define PAGE_OFFSET UL(0x40000000)
-#define TASK_UNMAPPED_BASE ((TASK_SIZE + 0x01000000) / 3)
#ifndef __ASSEMBLY__