sh: Make PAGE_OFFSET configurable.
nommu needs to be able to shift PAGE_OFFSET, so we switch it to a
non-user-visible CONFIG_PAGE_OFFSET and use that in the few places
where it matters.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 07d6d69..035df7f 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -238,32 +238,6 @@
source "arch/sh/mm/Kconfig"
-config MEMORY_START
- hex "Physical memory start address"
- default "0x08000000"
- ---help---
- Computers built with Hitachi SuperH processors always
- map the ROM starting at address zero. But the processor
- does not specify the range that RAM takes.
-
- The physical memory (RAM) start address will be automatically
- set to 08000000. Other platforms, such as the Solution Engine
- boards typically map RAM at 0C000000.
-
- Tweak this only when porting to a new machine which does not
- already have a defconfig. Changing it from the known correct
- value on any of the known systems will only lead to disaster.
-
-config MEMORY_SIZE
- hex "Physical memory size"
- default "0x00400000"
- help
- This sets the default memory size assumed by your SH kernel. It can
- be overridden as normal by the 'mem=' argument on the kernel command
- line. If unsure, consult your board specifications or just leave it
- as 0x00400000 which was the default value before this became
- configurable.
-
config CF_ENABLER
bool "Compact Flash Enabler support"
depends on SH_ADX || SH_SOLUTION_ENGINE || SH_UNKNOWN || SH_CAT68701 || SH_SH03
diff --git a/arch/sh/boot/compressed/Makefile b/arch/sh/boot/compressed/Makefile
index 75a6876..7074267 100644
--- a/arch/sh/boot/compressed/Makefile
+++ b/arch/sh/boot/compressed/Makefile
@@ -18,9 +18,10 @@
# Assign dummy values if these 2 variables are not defined,
# in order to suppress error message.
#
+CONFIG_PAGE_OFFSET ?= 0x80000000
CONFIG_MEMORY_START ?= 0x0c000000
CONFIG_BOOT_LINK_OFFSET ?= 0x00800000
-IMAGE_OFFSET := $(shell printf "0x%8x" $$[0x80000000+$(CONFIG_MEMORY_START)+$(CONFIG_BOOT_LINK_OFFSET)])
+IMAGE_OFFSET := $(shell printf "0x%8x" $$[$(CONFIG_PAGE_OFFSET)+$(CONFIG_MEMORY_START)+$(CONFIG_BOOT_LINK_OFFSET)])
LDFLAGS_vmlinux := -Ttext $(IMAGE_OFFSET) -e startup -T $(obj)/../../kernel/vmlinux.lds
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index 3f3e1e0..eb860c5 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -13,7 +13,7 @@
ENTRY(_start)
SECTIONS
{
- . = 0x80000000 + CONFIG_MEMORY_START + CONFIG_ZERO_PAGE_OFFSET;
+ . = CONFIG_PAGE_OFFSET + CONFIG_MEMORY_START + CONFIG_ZERO_PAGE_OFFSET;
_text = .; /* Text and read-only data */
text = .; /* Text and read-only data */
.empty_zero_page : {
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 9064dfc..f25903a 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -161,6 +161,37 @@
turning this off will boot the kernel on these machines with the
MMU implicitly switched off.
+config PAGE_OFFSET
+ hex
+ default "0x80000000" if MMU
+ default "0x00000000"
+
+config MEMORY_START
+ hex "Physical memory start address"
+ default "0x08000000"
+ ---help---
+ Computers built with Hitachi SuperH processors always
+ map the ROM starting at address zero. But the processor
+ does not specify the range that RAM takes.
+
+ The physical memory (RAM) start address will be automatically
+ set to 08000000. Other platforms, such as the Solution Engine
+ boards typically map RAM at 0C000000.
+
+ Tweak this only when porting to a new machine which does not
+ already have a defconfig. Changing it from the known correct
+ value on any of the known systems will only lead to disaster.
+
+config MEMORY_SIZE
+ hex "Physical memory size"
+ default "0x00400000"
+ help
+ This sets the default memory size assumed by your SH kernel. It can
+ be overridden as normal by the 'mem=' argument on the kernel command
+ line. If unsure, consult your board specifications or just leave it
+ as 0x00400000 which was the default value before this became
+ configurable.
+
config 32BIT
bool "Support 32-bit physical addressing through PMB"
depends on CPU_SH4A
diff --git a/include/asm-sh/page.h b/include/asm-sh/page.h
index 51d7281..1b3cfd1 100644
--- a/include/asm-sh/page.h
+++ b/include/asm-sh/page.h
@@ -84,7 +84,7 @@
#define __MEMORY_START CONFIG_MEMORY_START
#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
-#define PAGE_OFFSET (0x80000000UL)
+#define PAGE_OFFSET CONFIG_PAGE_OFFSET
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
