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powerpc/fsl-booke: Make CAM entries used for lowmem configurable

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On booke processors, the code that maps low memory only uses up to three
CAM entries, even though there are sixteen and nothing else uses them.

Make this number configurable in the advanced options menu along with max
low memory size.  If one wants 1 GB of lowmem, then it's typically
necessary to have four CAM entries.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Trent Piepho
2008-12-08 19:34:58 -08:00
committed by Kumar Gala
parent c8f3570b7e
commit 96051465fd
2 changed files with 21 additions and 1 deletions
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6
arch/powerpc/mm/fsl_booke_mmu.c
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@@ -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 {