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authorKumar Gala <galak@kernel.crashing.org>2008-04-16 05:52:23 +1000
committerPaul Mackerras <paulus@samba.org>2008-04-17 07:46:13 +1000
commit0aef996b37d08757562ecf0bb0c1f6998e634c8b (patch)
treeaaf590eeabc3c6bf0bcfa4ea1402e9c27a164213
parentd7917ba7051e3fd12ebe2d5a09b29fb3a2b38190 (diff)
downloadop-kernel-dev-0aef996b37d08757562ecf0bb0c1f6998e634c8b.zip
op-kernel-dev-0aef996b37d08757562ecf0bb0c1f6998e634c8b.tar.gz
[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 <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/kernel/head_fsl_booke.S34
-rw-r--r--arch/powerpc/mm/fsl_booke_mmu.c37
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 <asm/mmu.h>
#include <asm/uaccess.h>
#include <asm/smp.h>
-#include <asm/bootx.h>
#include <asm/machdep.h>
#include <asm/setup.h>
@@ -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;
}
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