diff options
Diffstat (limited to 'target-s390x/helper.c')
| -rw-r--r-- | target-s390x/helper.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/target-s390x/helper.c b/target-s390x/helper.c index aa628b8fe2..ddf268e838 100644 --- a/target-s390x/helper.c +++ b/target-s390x/helper.c @@ -170,6 +170,20 @@ static void trigger_page_fault(CPUS390XState *env, target_ulong vaddr, trigger_pgm_exception(env, type, ilen); } +/** + * Translate real address to absolute (= physical) + * address by taking care of the prefix mapping. + */ +static target_ulong mmu_real2abs(CPUS390XState *env, target_ulong raddr) +{ + if (raddr < 0x2000) { + return raddr + env->psa; /* Map the lowcore. */ + } else if (raddr >= env->psa && raddr < env->psa + 0x2000) { + return raddr - env->psa; /* Map the 0 page. */ + } + return raddr; +} + 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) @@ -363,9 +377,7 @@ int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc, out: /* Convert real address -> absolute address */ - if (*raddr < 0x2000) { - *raddr = *raddr + env->psa; - } + *raddr = mmu_real2abs(env, *raddr); if (*raddr <= ram_size) { sk = &env->storage_keys[*raddr / TARGET_PAGE_SIZE]; |