From 0aef996b37d08757562ecf0bb0c1f6998e634c8b Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Wed, 16 Apr 2008 05:52:23 +1000 Subject: [POWERPC] 85xx: Cleanup TLB initialization * Determine the RPN we are running the kernel at runtime rather than using compile time constant for initial TLB * Cleanup adjust_total_lowmem() to respect memstart_addr and be a bit more clear on variables that are sizes vs addresses. Signed-off-by: Kumar Gala Signed-off-by: Paul Mackerras --- arch/powerpc/mm/fsl_booke_mmu.c | 37 ++++++++++++++++--------------------- 1 file changed, 16 insertions(+), 21 deletions(-) (limited to 'arch/powerpc/mm') diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c index 3dd0c8189ba..59f6649ae42 100644 --- a/arch/powerpc/mm/fsl_booke_mmu.c +++ b/arch/powerpc/mm/fsl_booke_mmu.c @@ -49,7 +49,6 @@ #include #include #include -#include #include #include @@ -59,7 +58,6 @@ extern void loadcam_entry(unsigned int index); unsigned int tlbcam_index; unsigned int num_tlbcam_entries; static unsigned long __cam0, __cam1, __cam2; -#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE #define NUM_TLBCAMS (16) @@ -195,35 +193,32 @@ unsigned long __init mmu_mapin_ram(void) void __init adjust_total_lowmem(void) { - unsigned long max_low_mem = MAX_LOW_MEM; - unsigned long cam_max = 0x10000000; - unsigned long ram; + phys_addr_t max_lowmem_size = __max_low_memory; + phys_addr_t cam_max_size = 0x10000000; + phys_addr_t ram; - /* adjust CAM size to max_low_mem */ - if (max_low_mem < cam_max) - cam_max = max_low_mem; + /* adjust CAM size to max_lowmem_size */ + if (max_lowmem_size < cam_max_size) + cam_max_size = max_lowmem_size; - /* adjust lowmem size to max_low_mem */ - if (max_low_mem < total_lowmem) - ram = max_low_mem; - else - ram = total_lowmem; + /* adjust lowmem size to max_lowmem_size */ + ram = min(max_lowmem_size, total_lowmem); /* Calculate CAM values */ __cam0 = 1UL << 2 * (__ilog2(ram) / 2); - if (__cam0 > cam_max) - __cam0 = cam_max; + if (__cam0 > cam_max_size) + __cam0 = cam_max_size; ram -= __cam0; if (ram) { __cam1 = 1UL << 2 * (__ilog2(ram) / 2); - if (__cam1 > cam_max) - __cam1 = cam_max; + if (__cam1 > cam_max_size) + __cam1 = cam_max_size; ram -= __cam1; } if (ram) { __cam2 = 1UL << 2 * (__ilog2(ram) / 2); - if (__cam2 > cam_max) - __cam2 = cam_max; + if (__cam2 > cam_max_size) + __cam2 = cam_max_size; ram -= __cam2; } @@ -231,6 +226,6 @@ adjust_total_lowmem(void) " CAM2=%ldMb residual: %ldMb\n", __cam0 >> 20, __cam1 >> 20, __cam2 >> 20, (total_lowmem - __cam0 - __cam1 - __cam2) >> 20); - __max_low_memory = max_low_mem = __cam0 + __cam1 + __cam2; - __initial_memory_limit = __max_low_memory; + __max_low_memory = __cam0 + __cam1 + __cam2; + __initial_memory_limit = memstart_addr + __max_low_memory; } -- cgit v1.2.3