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-rw-r--r--arch/powerpc/Kconfig16
-rw-r--r--arch/powerpc/mm/fsl_booke_mmu.c6
2 files changed, 21 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b408e352198c..8782b4b689a7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -730,6 +730,22 @@ config LOWMEM_SIZE
hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
default "0x30000000"
+config LOWMEM_CAM_NUM_BOOL
+ bool "Set number of CAMs to use to map low memory"
+ depends on ADVANCED_OPTIONS && FSL_BOOKE
+ help
+ This option allows you to set the maximum number of CAM slots that
+ will be used to map low memory. There are a limited number of slots
+ available and even more limited number that will fit in the L1 MMU.
+ However, using more entries will allow mapping more low memory. This
+ can be useful in optimizing the layout of kernel virtual memory.
+
+ Say N here unless you know what you are doing.
+
+config LOWMEM_CAM_NUM
+ int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
+ default 3
+
config RELOCATABLE
bool "Build a relocatable kernel (EXPERIMENTAL)"
depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c
index dfd292748e6e..0b9ba6be49d9 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -56,10 +56,14 @@
extern void loadcam_entry(unsigned int index);
unsigned int tlbcam_index;
-static unsigned long cam[3];
+static unsigned long cam[CONFIG_LOWMEM_CAM_NUM];
#define NUM_TLBCAMS (16)
+#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
+#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
+#endif
+
struct tlbcam TLBCAM[NUM_TLBCAMS];
struct tlbcamrange {