diff options
Diffstat (limited to 'arch/arc/mm/tlbex.S')
| -rw-r--r-- | arch/arc/mm/tlbex.S | 39 |
1 files changed, 14 insertions, 25 deletions
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S index 9df765dc7c3..5c5bb23001b 100644 --- a/arch/arc/mm/tlbex.S +++ b/arch/arc/mm/tlbex.S @@ -39,7 +39,7 @@ #include <linux/linkage.h> #include <asm/entry.h> -#include <asm/tlb.h> +#include <asm/mmu.h> #include <asm/pgtable.h> #include <asm/arcregs.h> #include <asm/cache.h> @@ -147,9 +147,9 @@ ex_saved_reg1: #ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT and.f 0, r0, _PAGE_PRESENT bz 1f - ld r2, [num_pte_not_present] - add r2, r2, 1 - st r2, [num_pte_not_present] + ld r3, [num_pte_not_present] + add r3, r3, 1 + st r3, [num_pte_not_present] 1: #endif @@ -271,22 +271,22 @@ ARC_ENTRY EV_TLBMissI #endif ;---------------------------------------------------------------- - ; Get the PTE corresponding to V-addr accessed + ; Get the PTE corresponding to V-addr accessed, r2 is setup with EFA LOAD_FAULT_PTE ;---------------------------------------------------------------- ; VERIFY_PTE: Check if PTE permissions approp for executing code cmp_s r2, VMALLOC_START - mov.lo r2, (_PAGE_PRESENT | _PAGE_READ | _PAGE_EXECUTE) - mov.hs r2, (_PAGE_PRESENT | _PAGE_K_READ | _PAGE_K_EXECUTE) + mov.lo r2, (_PAGE_PRESENT | _PAGE_U_EXECUTE) + mov.hs r2, (_PAGE_PRESENT | _PAGE_K_EXECUTE) and r3, r0, r2 ; Mask out NON Flag bits from PTE xor.f r3, r3, r2 ; check ( ( pte & flags_test ) == flags_test ) bnz do_slow_path_pf ; Let Linux VM know that the page was accessed - or r0, r0, (_PAGE_PRESENT | _PAGE_ACCESSED) ; set Accessed Bit - st_s r0, [r1] ; Write back PTE + or r0, r0, _PAGE_ACCESSED ; set Accessed Bit + st_s r0, [r1] ; Write back PTE CONV_PTE_TO_TLB COMMIT_ENTRY_TO_MMU @@ -311,7 +311,7 @@ ARC_ENTRY EV_TLBMissD ;---------------------------------------------------------------- ; Get the PTE corresponding to V-addr accessed - ; If PTE exists, it will setup, r0 = PTE, r1 = Ptr to PTE + ; If PTE exists, it will setup, r0 = PTE, r1 = Ptr to PTE, r2 = EFA LOAD_FAULT_PTE ;---------------------------------------------------------------- @@ -320,9 +320,9 @@ ARC_ENTRY EV_TLBMissD mov_s r2, 0 lr r3, [ecr] btst_s r3, ECR_C_BIT_DTLB_LD_MISS ; Read Access - or.nz r2, r2, _PAGE_READ ; chk for Read flag in PTE + or.nz r2, r2, _PAGE_U_READ ; chk for Read flag in PTE btst_s r3, ECR_C_BIT_DTLB_ST_MISS ; Write Access - or.nz r2, r2, _PAGE_WRITE ; chk for Write flag in PTE + or.nz r2, r2, _PAGE_U_WRITE ; chk for Write flag in PTE ; Above laddering takes care of XCHG access ; which is both Read and Write @@ -345,7 +345,7 @@ ARC_ENTRY EV_TLBMissD ;---------------------------------------------------------------- ; UPDATE_PTE: Let Linux VM know that page was accessed/dirty lr r3, [ecr] - or r0, r0, (_PAGE_PRESENT | _PAGE_ACCESSED) ; Accessed bit always + or r0, r0, _PAGE_ACCESSED ; Accessed bit always btst_s r3, ECR_C_BIT_DTLB_ST_MISS ; See if it was a Write Access ? or.nz r0, r0, _PAGE_MODIFIED ; if Write, set Dirty bit as well st_s r0, [r1] ; Write back PTE @@ -381,18 +381,7 @@ do_slow_path_pf: ; ------- setup args for Linux Page fault Hanlder --------- mov_s r0, sp - lr r2, [efa] - lr r3, [ecr] - - ; Both st and ex imply WRITE access of some sort, hence do_page_fault( ) - ; invoked with write=1 for DTLB-st/ex Miss and write=0 for ITLB miss or - ; DTLB-ld Miss - ; DTLB Miss Cause code is ld = 0x01 , st = 0x02, ex = 0x03 - ; Following code uses that fact that st/ex have one bit in common - - btst_s r3, ECR_C_BIT_DTLB_ST_MISS - mov.z r1, 0 - mov.nz r1, 1 + lr r1, [efa] ; We don't want exceptions to be disabled while the fault is handled. ; Now that we have saved the context we return from exception hence |