diff options
Diffstat (limited to 'arch/powerpc/mm/copro_fault.c')
| -rw-r--r-- | arch/powerpc/mm/copro_fault.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c index ba7df14c6b82..a15a23efc0e2 100644 --- a/arch/powerpc/mm/copro_fault.c +++ b/arch/powerpc/mm/copro_fault.c @@ -24,6 +24,7 @@ #include <linux/mm.h> #include <linux/export.h> #include <asm/reg.h> +#include <asm/copro.h> /* * This ought to be kept in sync with the powerpc specific do_page_fault @@ -90,3 +91,48 @@ out_unlock: return ret; } EXPORT_SYMBOL_GPL(copro_handle_mm_fault); + +int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb) +{ + u64 vsid; + int psize, ssize; + + slb->esid = (ea & ESID_MASK) | SLB_ESID_V; + + switch (REGION_ID(ea)) { + case USER_REGION_ID: + pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea); + psize = get_slice_psize(mm, ea); + ssize = user_segment_size(ea); + vsid = get_vsid(mm->context.id, ea, ssize); + break; + case VMALLOC_REGION_ID: + pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea); + if (ea < VMALLOC_END) + psize = mmu_vmalloc_psize; + else + psize = mmu_io_psize; + ssize = mmu_kernel_ssize; + vsid = get_kernel_vsid(ea, mmu_kernel_ssize); + break; + case KERNEL_REGION_ID: + pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea); + psize = mmu_linear_psize; + ssize = mmu_kernel_ssize; + vsid = get_kernel_vsid(ea, mmu_kernel_ssize); + break; + default: + pr_debug("%s: invalid region access at %016llx\n", __func__, ea); + return 1; + } + + vsid = (vsid << slb_vsid_shift(ssize)) | SLB_VSID_USER; + + vsid |= mmu_psize_defs[psize].sllp | + ((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0); + + slb->vsid = vsid; + + return 0; +} +EXPORT_SYMBOL_GPL(copro_calculate_slb); |