diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/Kconfig | 16 | ||||
| -rw-r--r-- | arch/powerpc/mm/fsl_booke_mmu.c | 6 |
2 files changed, 21 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index b408e352198..8782b4b689a 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 dfd292748e6..0b9ba6be49d 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 { |