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authorSuzuki Poulose <suzuki@in.ibm.com>2011-12-14 22:57:15 +0000
committerJosh Boyer <jwboyer@gmail.com>2011-12-20 10:20:19 -0500
commit0f890c8d205e47f7cb0d381ffba582a170fd4f72 (patch)
tree66d8370622f15636134b83bd19145ce61d8d719c /arch/powerpc/kernel/head_44x.S
parent3f53638c805f75989f4b4be07efcfd173cdd5e2d (diff)
powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE
The current implementation of CONFIG_RELOCATABLE in BookE is based on mapping the page aligned kernel load address to KERNELBASE. This approach however is not enough for platforms, where the TLB page size is large (e.g, 256M on 44x). So we are renaming the RELOCATABLE used currently in BookE to DYNAMIC_MEMSTART to reflect the actual method. The CONFIG_RELOCATABLE for PPC32(BookE) based on processing of the dynamic relocations will be introduced in the later in the patch series. This change would allow the use of the old method of RELOCATABLE for platforms which can afford to enforce the page alignment (platforms with smaller TLB size). Changes since v3: * Introduced a new config, NONSTATIC_KERNEL, to denote a kernel which is either a RELOCATABLE or DYNAMIC_MEMSTART(Suggested by: Josh Boyer) Suggested-by: Scott Wood <scottwood@freescale.com> Tested-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> Cc: Scott Wood <scottwood@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Josh Boyer <jwboyer@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linux ppc dev <linuxppc-dev@lists.ozlabs.org> Signed-off-by: Josh Boyer <jwboyer@gmail.com>
Diffstat (limited to 'arch/powerpc/kernel/head_44x.S')
-rw-r--r--arch/powerpc/kernel/head_44x.S4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index bb7a9c7a4c0..d7a1debda10 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -86,8 +86,10 @@ _ENTRY(_start);
bl early_init
-#ifdef CONFIG_RELOCATABLE
+#ifdef CONFIG_DYNAMIC_MEMSTART
/*
+ * Mapping based, page aligned dynamic kernel loading.
+ *
* r25 will contain RPN/ERPN for the start address of memory
*
* Add the difference between KERNELBASE and PAGE_OFFSET to the