[ARM] Make kernel link address depend on PAGE_OFFSET

We are coding the kernel link address into the makefiles, which is
invisibly dependent on PAGE_OFFSET.  If PAGE_OFFSET is changed, the
makefiles also need to be changed.

Make adjustments such that the makefiles encode just the offset from
PAGE_OFFSET for the kernel link address, and use PAGE_OFFSET in the
linker scripts directly.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 16 insertions, 17 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 81bd2193fe6d..afaf3a1e903c 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -8,7 +8,7 @@
 # Copyright (C) 1995-2001 by Russell King
 
 LDFLAGS_vmlinux :=-p --no-undefined -X
-CPPFLAGS_vmlinux.lds = -DKERNEL_RAM_ADDR=$(TEXTADDR)
+CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
 OBJCOPYFLAGS    :=-O binary -R .note -R .comment -S
 GZFLAGS         :=-9
 #CFLAGS         +=-pipe
@@ -65,7 +65,7 @@ CHECKFLAGS	+= -D__arm__
 
 #Default value
 head-y          := arch/arm/kernel/head.o arch/arm/kernel/init_task.o
-textaddr-y      := 0xC0008000
+textofs-y       := 0x00008000
 
  machine-$(CONFIG_ARCH_RPC)        := rpc
  machine-$(CONFIG_ARCH_EBSA110)    := ebsa110
@@ -73,22 +73,20 @@ textaddr-y	:= 0xC0008000
   incdir-$(CONFIG_ARCH_CLPS7500)   := cl7500
  machine-$(CONFIG_FOOTBRIDGE)      := footbridge
   incdir-$(CONFIG_FOOTBRIDGE)      := ebsa285
-textaddr-$(CONFIG_ARCH_CO285)      := 0x60008000
  machine-$(CONFIG_ARCH_CO285)      := footbridge
   incdir-$(CONFIG_ARCH_CO285)      := ebsa285
  machine-$(CONFIG_ARCH_SHARK)      := shark
  machine-$(CONFIG_ARCH_SA1100)     := sa1100
 ifeq ($(CONFIG_ARCH_SA1100),y)
 # SA1111 DMA bug: we don't want the kernel to live in precious DMA-able memory
-textaddr-$(CONFIG_SA1111)          := 0xc0208000
+ textofs-$(CONFIG_SA1111)          := 0x00208000
 endif
  machine-$(CONFIG_ARCH_PXA)        := pxa
  machine-$(CONFIG_ARCH_L7200)      := l7200
  machine-$(CONFIG_ARCH_INTEGRATOR) := integrator
  machine-$(CONFIG_ARCH_CAMELOT)    := epxa10db
-textaddr-$(CONFIG_ARCH_CLPS711X)   := 0xc0028000
+ textofs-$(CONFIG_ARCH_CLPS711X)   := 0x00028000
  machine-$(CONFIG_ARCH_CLPS711X)   := clps711x
-textaddr-$(CONFIG_ARCH_FORTUNET)   := 0xc0008000
  machine-$(CONFIG_ARCH_IOP3XX)     := iop3xx
  machine-$(CONFIG_ARCH_IXP4XX)     := ixp4xx
  machine-$(CONFIG_ARCH_IXP2000)    := ixp2000
@@ -110,7 +108,8 @@ CFLAGS_3c589_cs.o :=-DISA_SIXTEEN_BIT_PERIPHERAL
 export CFLAGS_3c589_cs.o
 endif
 
-TEXTADDR := $(textaddr-y)
+# The byte offset of the kernel image in RAM from the start of RAM.
+TEXT_OFFSET := $(textofs-y)
 
 ifeq ($(incdir-y),)
 incdir-y := $(machine-y)
@@ -123,7 +122,7 @@ else
 MACHINE  :=
 endif
   
-export  TEXTADDR GZFLAGS
+export  TEXT_OFFSET GZFLAGS
 
 # Do we have FASTFPE?
 FASTFPE         :=arch/arm/fastfpe
diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
index 937a353bc37c..a174d63395ea 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -15,7 +15,7 @@ include $(srctree)/$(MACHINE)/Makefile.boot
 endif
 
 # Note: the following conditions must always be true:
-#   ZRELADDR == virt_to_phys(TEXTADDR)
+#   ZRELADDR == virt_to_phys(PAGE_OFFSET + TEXT_OFFSET)
 #   PARAMS_PHYS must be within 4MB of ZRELADDR
 #   INITRD_PHYS must be in RAM
 ZRELADDR    := $(zreladdr-y)
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index c11169b5ed9a..25b14c3fdc4a 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-AFLAGS_head.o := -DKERNEL_RAM_ADDR=$(TEXTADDR)
+AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
 
 # Object file lists.
 
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index d7d69fd7039f..1e985f2cd70f 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -33,6 +33,8 @@
 #define MACHINFO_PGOFFIO        12
 #define MACHINFO_NAME           16
 
+#define KERNEL_RAM_ADDR (PAGE_OFFSET + TEXT_OFFSET)
+
 /*
  * swapper_pg_dir is the virtual address of the initial page table.
  * We place the page tables 16K below KERNEL_RAM_ADDR.  Therefore, we must
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 9a47770114d4..2b254e88595c 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -17,15 +17,13 @@ jiffies = jiffies_64;
 jiffies = jiffies_64 + 4;
 #endif
 
+SECTIONS
+{
 #ifdef CONFIG_XIP_KERNEL
-#define TEXTADDR  XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+        . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
 #else
-#define TEXTADDR  KERNEL_RAM_ADDR
+        . = PAGE_OFFSET + TEXT_OFFSET;
 #endif
-
-SECTIONS
-{
-        . = TEXTADDR;
         .init : {                       /* Init code and data           */
                 _stext = .;
                         _sinittext = .;
@@ -104,7 +102,7 @@ SECTIONS
 
 #ifdef CONFIG_XIP_KERNEL
         __data_loc = ALIGN(4);          /* location in binary */
-        . = KERNEL_RAM_ADDR;
+        . = PAGE_OFFSET + TEXT_OFFSET;
 #else
         . = ALIGN(THREAD_SIZE);
         __data_loc = .;