patches.sh7757lcr/021-sh-kexec-add-physical_start.patch

From ltsi-dev-bounces@lists.linuxfoundation.org Mon May 28 02:48:07 2012
From: "Shimoda, Yoshihiro" <yoshihiro.shimoda.uh@renesas.com>
Date: Mon, 28 May 2012 18:48:04 +0900
Subject: [LTSI-dev] [PATCH 21/21] sh: kexec: Add PHYSICAL_START
To: ltsi-dev@lists.linuxfoundation.org
Message-ID: <4FC349D4.5090003@renesas.com>


>From e5e6ee27709b81739b5c22123e5b4c2f81303570 Mon Sep 17 00:00:00 2001
From: Simon Horman <horms@verge.net.au>
Date: Thu, 15 Sep 2011 20:13:00 +0900
Subject: sh: kexec: Add PHYSICAL_START

Add PHYSICAL_START kernel configuration parameter to set the address at
which the kernel should be loaded.

It has been observed on an sh7757lcr that simply modifying MEMORY_START
does not achieve this goal for 32bit sh. This is due to MEMORY_OFFSET in
arch/sh/kernel/vmlinux.lds.S bot being based on MEMORY_START on such
systems.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
(cherry picked from commit e66ac3f26aef131f5ca60350d25fba95f43acd0d)

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 arch/sh/Kconfig              |   13 ++++++++++++-
 arch/sh/boot/Makefile        |    6 ++++--
 arch/sh/include/asm/page.h   |   10 ++++++++++
 arch/sh/kernel/vmlinux.lds.S |    2 +-
 arch/sh/mm/init.c            |    8 ++++----
 5 files changed, 31 insertions(+), 8 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index bbdeb48..0d07d40 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -648,7 +648,7 @@ config CRASH_DUMP
 	  a specially reserved region and then later executed after
 	  a crash by kdump/kexec. The crash dump kernel must be compiled
 	  to a memory address not used by the main kernel using
-	  MEMORY_START.
+	  PHYSICAL_START.

 	  For more details see Documentation/kdump/kdump.txt

@@ -659,6 +659,17 @@ config KEXEC_JUMP
 	  Jump between original kernel and kexeced kernel and invoke
 	  code via KEXEC

+config PHYSICAL_START
+	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
+	default MEMORY_START
+	---help---
+	  This gives the physical address where the kernel is loaded
+	  and is ordinarily the same as MEMORY_START.
+
+	  Different values are primarily used in the case of kexec on panic
+	  where the fail safe kernel needs to run at a different address
+	  than the panic-ed kernel.
+
 config SECCOMP
 	bool "Enable seccomp to safely compute untrusted bytecode"
 	depends on PROC_FS
diff --git a/arch/sh/boot/Makefile b/arch/sh/boot/Makefile
index ba515d8..e4ea31a 100644
--- a/arch/sh/boot/Makefile
+++ b/arch/sh/boot/Makefile
@@ -19,6 +19,7 @@ CONFIG_MEMORY_START	?= 0x0c000000
 CONFIG_BOOT_LINK_OFFSET	?= 0x00800000
 CONFIG_ZERO_PAGE_OFFSET	?= 0x00001000
 CONFIG_ENTRY_OFFSET	?= 0x00001000
+CONFIG_PHYSICAL_START	?= $(CONFIG_MEMORY_START)

 suffix-y := bin
 suffix-$(CONFIG_KERNEL_GZIP)	:= gz
@@ -48,7 +49,7 @@ $(obj)/romimage/vmlinux: $(obj)/zImage FORCE
 	$(Q)$(MAKE) $(build)=$(obj)/romimage $@

 KERNEL_MEMORY	:= $(shell /bin/bash -c 'printf "0x%08x" \
-		     $$[$(CONFIG_MEMORY_START) & 0x1fffffff]')
+		     $$[$(CONFIG_PHYSICAL_START) & 0x1fffffff]')

 KERNEL_LOAD	:= $(shell /bin/bash -c 'printf "0x%08x" \
 		     $$[$(CONFIG_PAGE_OFFSET)  + \
@@ -114,4 +115,5 @@ $(obj)/uImage: $(obj)/uImage.$(suffix-y)
 	@echo '  Image $@ is ready'

 export CONFIG_PAGE_OFFSET CONFIG_MEMORY_START CONFIG_BOOT_LINK_OFFSET \
-       CONFIG_ZERO_PAGE_OFFSET CONFIG_ENTRY_OFFSET KERNEL_MEMORY suffix-y
+       CONFIG_PHYSICAL_START CONFIG_ZERO_PAGE_OFFSET CONFIG_ENTRY_OFFSET \
+       KERNEL_MEMORY suffix-y
diff --git a/arch/sh/include/asm/page.h b/arch/sh/include/asm/page.h
index abcc4dc..15d9703 100644
--- a/arch/sh/include/asm/page.h
+++ b/arch/sh/include/asm/page.h
@@ -113,6 +113,16 @@ typedef struct page *pgtable_t;
 #define __MEMORY_SIZE		CONFIG_MEMORY_SIZE

 /*
+ * PHYSICAL_OFFSET is the offset in physical memory where the base
+ * of the kernel is loaded.
+ */
+#ifdef CONFIG_PHYSICAL_START
+#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
+#else
+#define PHYSICAL_OFFSET 0
+#endif
+
+/*
  * PAGE_OFFSET is the virtual address of the start of kernel address
  * space.
  */
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index 731c10c..c98905f 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -23,7 +23,7 @@ OUTPUT_ARCH(sh)
 ENTRY(_start)
 SECTIONS
 {
-	. = PAGE_OFFSET + MEMORY_OFFSET + CONFIG_ZERO_PAGE_OFFSET;
+	. = PAGE_OFFSET + MEMORY_OFFSET + PHYSICAL_OFFSET + CONFIG_ZERO_PAGE_OFFSET;

 	_text = .;		/* Text and read-only data */

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 58a93fb..c9dbace 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -287,6 +287,8 @@ static void __init do_init_bootmem(void)
 static void __init early_reserve_mem(void)
 {
 	unsigned long start_pfn;
+	u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
+	u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;

 	/*
 	 * Partially used pages are not usable - thus
@@ -300,15 +302,13 @@ static void __init early_reserve_mem(void)
 	 * this catches the (definitely buggy) case of us accidentally
 	 * initializing the bootmem allocator with an invalid RAM area.
 	 */
-	memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
-		    (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
-		    (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
+	memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);

 	/*
 	 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 	 */
 	if (CONFIG_ZERO_PAGE_OFFSET != 0)
-		memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
+		memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);

 	/*
 	 * Handle additional early reservations
-- 
1.7.1
_______________________________________________
LTSI-dev mailing list
LTSI-dev@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/ltsi-dev