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authorAlbert Herranz <albert_herranz@yahoo.es>2009-12-12 06:31:50 +0000
committerGrant Likely <grant.likely@secretlab.ca>2009-12-12 22:24:30 -0700
commitb8e8efaa86399c4424becd96402993cf230dab57 (patch)
tree5fc7a8e27357569c8e54e62a715e2ff68c3fa0f6 /arch
parent08b95a7adba71a342aa152a695e75607102f484f (diff)
downloadop-kernel-dev-b8e8efaa86399c4424becd96402993cf230dab57.zip
op-kernel-dev-b8e8efaa86399c4424becd96402993cf230dab57.tar.gz
powerpc: reserve fixmap entries for early debug
Add a set of entries to the fixmap table to allow usage of known reserved virtual address space by early debug code. The address space reserved is the top 128K of the 32-bit address space. This allows, if required, the use of a BAT to do the mappings. Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/fixmap.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/fixmap.h b/arch/powerpc/include/asm/fixmap.h
index f1f4e23..5c2c023 100644
--- a/arch/powerpc/include/asm/fixmap.h
+++ b/arch/powerpc/include/asm/fixmap.h
@@ -44,6 +44,9 @@
*/
enum fixed_addresses {
FIX_HOLE,
+ /* reserve the top 128K for early debugging purposes */
+ FIX_EARLY_DEBUG_TOP = FIX_HOLE,
+ FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+((128*1024)/PAGE_SIZE)-1,
#ifdef CONFIG_HIGHMEM
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
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