From 0aef996b37d08757562ecf0bb0c1f6998e634c8b Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Wed, 16 Apr 2008 05:52:23 +1000 Subject: [PATCH] [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/kernel/head_fsl_booke.S | 34 ++++++++++++++++++++++++++------- arch/powerpc/mm/fsl_booke_mmu.c | 37 ++++++++++++++++-------------------- 2 files changed, 43 insertions(+), 28 deletions(-) diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index d9cc2c2..9f40b3e 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -68,7 +68,9 @@ _ENTRY(_start); mr r29,r5 mr r28,r6 mr r27,r7 + li r25,0 /* phys kernel start (low) */ li r24,0 /* CPU number */ + li r23,0 /* phys kernel start (high) */ /* We try to not make any assumptions about how the boot loader * setup or used the TLBs. We invalidate all mappings from the @@ -167,7 +169,28 @@ skpinv: addi r6,r6,1 /* Increment */ mtspr SPRN_MAS0,r7 tlbre - /* Just modify the entry ID, EPN and RPN for the temp mapping */ + /* grab and fixup the RPN */ + mfspr r6,SPRN_MAS1 /* extract MAS1[SIZE] */ + rlwinm r6,r6,25,27,30 + li r8,-1 + addi r6,r6,10 + slw r6,r8,r6 /* convert to mask */ + + bl 1f /* Find our address */ +1: mflr r7 + + mfspr r8,SPRN_MAS3 +#ifdef CONFIG_PHYS_64BIT + mfspr r23,SPRN_MAS7 +#endif + and r8,r6,r8 + subfic r9,r6,-4096 + and r9,r9,r7 + + or r25,r8,r9 + ori r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR) + + /* Just modify the entry ID and EPN for the temp mapping */ lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ mtspr SPRN_MAS0,r7 @@ -177,12 +200,10 @@ skpinv: addi r6,r6,1 /* Increment */ ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_4K))@l mtspr SPRN_MAS1,r6 mfspr r6,SPRN_MAS2 - lis r7,PHYSICAL_START@h + li r7,0 /* temp EPN = 0 */ rlwimi r7,r6,0,20,31 mtspr SPRN_MAS2,r7 - mfspr r6,SPRN_MAS3 - rlwimi r7,r6,0,20,31 - mtspr SPRN_MAS3,r7 + mtspr SPRN_MAS3,r8 tlbwe xori r6,r4,1 @@ -232,8 +253,7 @@ skpinv: addi r6,r6,1 /* Increment */ ori r6,r6,PAGE_OFFSET@l rlwimi r6,r7,0,20,31 mtspr SPRN_MAS2,r6 - li r7,(MAS3_SX|MAS3_SW|MAS3_SR) - mtspr SPRN_MAS3,r7 + mtspr SPRN_MAS3,r8 tlbwe /* 7. Jump to KERNELBASE mapping */ diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c index 3dd0c818..59f6649 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; } -- 2.7.4