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yaml --- r: 138407 b: refs/heads/master c: 9605146 h: refs/heads/master i: 138405: 22f107b 138403: 22cbd54 138399: 8fc2b7c v: v3
git-mirror · Jan 29, 2009 · 772bb13 · 772bb13
1 parent 13436e8
commit 772bb13
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Showing 3 changed files with 22 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c8f3570b7e2dd070ba6da41f3ed4ffb4e1d296af
+refs/heads/master: 96051465fdc29e00dd14b484a45daac089c657f8
diff --git a/trunk/arch/powerpc/Kconfig b/trunk/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/trunk/arch/powerpc/mm/fsl_booke_mmu.c b/trunk/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 {