diff options
| -rw-r--r-- | target/arm/ptw.c | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/target/arm/ptw.c b/target/arm/ptw.c index 5eb3577bcd..ba1a27ca2b 100644 --- a/target/arm/ptw.c +++ b/target/arm/ptw.c @@ -711,8 +711,68 @@ static uint64_t arm_casq_ptw(CPUARMState *env, uint64_t old_val, void *host = ptw->out_host; if (unlikely(!host)) { - fi->type = ARMFault_UnsuppAtomicUpdate; - return 0; + /* Page table in MMIO Memory Region */ + CPUState *cs = env_cpu(env); + MemTxAttrs attrs = { + .space = ptw->out_space, + .secure = arm_space_is_secure(ptw->out_space), + }; + AddressSpace *as = arm_addressspace(cs, attrs); + MemTxResult result = MEMTX_OK; + bool need_lock = !bql_locked(); + + if (need_lock) { + bql_lock(); + } + if (ptw->out_be) { + cur_val = address_space_ldq_be(as, ptw->out_phys, attrs, &result); + if (unlikely(result != MEMTX_OK)) { + fi->type = ARMFault_SyncExternalOnWalk; + fi->ea = arm_extabort_type(result); + if (need_lock) { + bql_unlock(); + } + return old_val; + } + if (cur_val == old_val) { + address_space_stq_be(as, ptw->out_phys, new_val, attrs, &result); + if (unlikely(result != MEMTX_OK)) { + fi->type = ARMFault_SyncExternalOnWalk; + fi->ea = arm_extabort_type(result); + if (need_lock) { + bql_unlock(); + } + return old_val; + } + cur_val = new_val; + } + } else { + cur_val = address_space_ldq_le(as, ptw->out_phys, attrs, &result); + if (unlikely(result != MEMTX_OK)) { + fi->type = ARMFault_SyncExternalOnWalk; + fi->ea = arm_extabort_type(result); + if (need_lock) { + bql_unlock(); + } + return old_val; + } + if (cur_val == old_val) { + address_space_stq_le(as, ptw->out_phys, new_val, attrs, &result); + if (unlikely(result != MEMTX_OK)) { + fi->type = ARMFault_SyncExternalOnWalk; + fi->ea = arm_extabort_type(result); + if (need_lock) { + bql_unlock(); + } + return old_val; + } + cur_val = new_val; + } + } + if (need_lock) { + bql_unlock(); + } + return cur_val; } /* |