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sh: kexec: Add PHYSICAL_START

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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>
This commit is contained in:
Simon Horman
2011-09-15 20:13:00 +09:00
committed by Paul Mundt
parent d11584a044
commit e66ac3f26a
5 changed files with 31 additions and 8 deletions
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10
arch/sh/include/asm/page.h
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@ -112,6 +112,16 @@ typedef struct page *pgtable_t;
#define __MEMORY_START CONFIG_MEMORY_START
#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.