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

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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>
This commit is contained in:
Lennert Buytenhek 2008-08-25 21:03:32 +01:00 committed by Russell King
parent 2d4b6c9aeb
commit 8d5796d2ec
4 changed files with 34 additions and 33 deletions
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24
arch/arm/Kconfig
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@ -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

30
arch/arm/include/asm/memory.h
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@ -13,43 +13,33 @@
#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.
*/
#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.

10
arch/arm/mach-footbridge/include/mach/memory.h
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@ -42,10 +42,6 @@ extern unsigned long __bus_to_virt(unsigned long);
#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 @@ extern unsigned long __bus_to_virt(unsigned long);
*/
#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

3
arch/arm/mach-iop13xx/include/mach/memory.h
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@ -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__