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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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8
arch/sh/mm/init.c
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@@ -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