diff options
Diffstat (limited to 'target-s390x/helper.c')
| -rw-r--r-- | target-s390x/helper.c | 70 |
1 files changed, 52 insertions, 18 deletions
diff --git a/target-s390x/helper.c b/target-s390x/helper.c index ddf268e838..7c76fc149b 100644 --- a/target-s390x/helper.c +++ b/target-s390x/helper.c @@ -184,6 +184,50 @@ static target_ulong mmu_real2abs(CPUS390XState *env, target_ulong raddr) return raddr; } +/* Decode page table entry (normal 4KB page) */ +static int mmu_translate_pte(CPUS390XState *env, target_ulong vaddr, + uint64_t asc, uint64_t asce, + target_ulong *raddr, int *flags, int rw) +{ + if (asce & _PAGE_INVALID) { + DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, asce); + trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw); + return -1; + } + + if (asce & _PAGE_RO) { + *flags &= ~PAGE_WRITE; + } + + *raddr = asce & _ASCE_ORIGIN; + + PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, asce); + + return 0; +} + +/* Decode EDAT1 segment frame absolute address (1MB page) */ +static int mmu_translate_sfaa(CPUS390XState *env, target_ulong vaddr, + uint64_t asc, uint64_t asce, target_ulong *raddr, + int *flags, int rw) +{ + if (asce & _SEGMENT_ENTRY_INV) { + DPRINTF("%s: SEG=0x%" PRIx64 " invalid\n", __func__, asce); + trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw); + return -1; + } + + if (asce & _SEGMENT_ENTRY_RO) { + *flags &= ~PAGE_WRITE; + } + + *raddr = (asce & 0xfffffffffff00000ULL) | (vaddr & 0xfffff); + + PTE_DPRINTF("%s: SEG=0x%" PRIx64 "\n", __func__, asce); + + return 0; +} + static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, uint64_t asc, uint64_t asce, int level, target_ulong *raddr, int *flags, int rw) @@ -243,28 +287,18 @@ static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr, PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n", __func__, origin, offs, new_asce); - if (level != _ASCE_TYPE_SEGMENT) { + if (level == _ASCE_TYPE_SEGMENT) { + /* 4KB page */ + return mmu_translate_pte(env, vaddr, asc, new_asce, raddr, flags, rw); + } else if (level - 4 == _ASCE_TYPE_SEGMENT && + (new_asce & _SEGMENT_ENTRY_FC) && (env->cregs[0] & CR0_EDAT)) { + /* 1MB page */ + return mmu_translate_sfaa(env, vaddr, asc, new_asce, raddr, flags, rw); + } else { /* yet another region */ return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr, flags, rw); } - - /* PTE */ - if (new_asce & _PAGE_INVALID) { - DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, new_asce); - trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw); - return -1; - } - - if (new_asce & _PAGE_RO) { - *flags &= ~PAGE_WRITE; - } - - *raddr = new_asce & _ASCE_ORIGIN; - - PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, new_asce); - - return 0; } static int mmu_translate_asc(CPUS390XState *env, target_ulong vaddr, |