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powerpc/fsl-booke: Fix CONFIG_RELOCATABLE support on FSL Book-E ppc32

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The following commit broke CONFIG_RELOCATABLE support on FSL Book-E
parts:

commit 549e8152de
Author: Paul Mackerras <paulus@samba.org>
Date:   Sat Aug 30 11:43:47 2008 +1000

    powerpc: Make the 64-bit kernel as a position-independent executable

The change to __va and __pa to use PAGE_OFFSET & MEMORY_START causes
problems on the Book-E parts because we don't know MEMORY_START until
after we parse the device tree.  We need __va to work properly to even
parse the device tree so we have a chicken an egg.  So go back to using
he other definition of __va/__pa on CONFIG_BOOKE and use the
PAGE_OFFSET/MEMORY_START version on "Classic" PPC64.

Also updated casts to handle phys_addr_t being a different size from
unsigned long (ie 36-bit physical on PPC32).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2010-04-21 02:12:58 -05:00
parent b4d0a038e0
commit dbc9632a8c
1 changed files with 14 additions and 1 deletions
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15
arch/powerpc/include/asm/page.h
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@ -108,8 +108,21 @@ extern phys_addr_t kernstart_addr;
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START))
/*
* On Book-E parts we need __va to parse the device tree and we can't
* determine MEMORY_START until then. However we can determine PHYSICAL_START
* from information at hand (program counter, TLB lookup).
*
* On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
* the other definitions for __va & __pa.
*/
#ifdef CONFIG_BOOKE
#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) - PHYSICAL_START + KERNELBASE))
#define __pa(x) ((unsigned long)(x) + PHYSICAL_START - KERNELBASE)
#else
#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + PAGE_OFFSET - MEMORY_START))
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
#endif
/*
* Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,