diff options
Diffstat (limited to 'arch/sparc64/kernel/dtlb_prot.S')
| -rw-r--r-- | arch/sparc64/kernel/dtlb_prot.S | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/dtlb_prot.S b/arch/sparc64/kernel/dtlb_prot.S new file mode 100644 index 000000000..8eec19260 --- /dev/null +++ b/arch/sparc64/kernel/dtlb_prot.S @@ -0,0 +1,56 @@ +/* $Id: dtlb_prot.S,v 1.10 1997/03/25 09:47:13 davem Exp $ + * dtlb_prot.S: Data TLB protection code, this is included directly + * into the trap table. + * + * Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + + /* We know kernel never takes protection trap, + * this makes this routine a lot easier than it + * would be otherwise. + */ + +#define MODIFIED_BITS (_PAGE_WRITE | _PAGE_W | _PAGE_MODIFIED | _PAGE_ACCESSED) + + /* ICACHE line 1 */ + /*0x00*/ ldxa [%g0] ASI_DMMU, %g1 ! Get TAG_TARGET + /*0x04*/ srlx %g1, 8, %g3 ! Position PGD offset + /*0x08*/ sllx %g1, 2, %g4 ! Position PMD offset + /*0x0c*/ and %g3, %g2, %g3 ! Mask PGD offset + /*0x10*/ and %g4, %g2, %g3 ! Mask PMD offset + /*0x14*/ ldxa [%g7 + %g3] ASI_PHYS_USE_EC, %g5 ! Load PGD + /*0x18*/ ldxa [%g5 + %g3] ASI_PHYS_USE_EC, %g4 ! Load PMD + /*0x1c*/ ldxa [%g0] ASI_DMMU_TSB_8KB_PTR, %g1 ! For PTE offset + + /* ICACHE line 2 */ + /*0x20*/ srlx %g1, 1, %g1 ! PTE offset + /*0x24*/ ldxa [%g4 + %g1] ASI_PHYS_USE_EC, %g3 ! Load PTE + /*0x28*/ andcc %g3, _PAGE_WRITE, %g0 ! Writable? + /*0x2c*/ be,pt %xcc, sparc64_dtlb_fault ! Nope... + /*0x30*/ or %g3, (MODIFIED_BITS), %g3 ! Yes it is + /*0x34*/ mov TLB_TAG_ACCESS, %g5 ! Get the page + /*0x38*/ ldxa [%g5] ASI_DMMU, %g1 ! From MMU + /*0x3c*/ add %g2, 7, %g5 ! Compute mask + + /* ICACHE line 3 */ + /*0x40*/ andn %g1, %g5, %g1 ! Mask page + /*0x44*/ or %g1, 0x10, %g1 ! 2ndary Context + /*0x48*/ stxa %g0, [%g1] ASI_DMMU_DEMAP ! TLB flush page + /*0x4c*/ membar #Sync ! Synchronize + /*0x50*/ stxa %g3, [%g4 + %g1] ASI_PHYS_USE_EC ! Update sw PTE + /*0x54*/ stxa %g3, [%g0] ASI_DTLB_DATA_IN ! TLB load + /*0x58*/ retry ! Trap return + /*0x5c*/ nop + + /* ICACHE line 4 */ + /*0x60*/ nop + /*0x64*/ nop + /*0x68*/ nop + /*0x6c*/ nop + /*0x70*/ nop + /*0x74*/ nop + /*0x78*/ nop + /*0x7c*/ nop + +#undef MODIFIED_BITS |