| # Copyright lowRISC contributors. |
| # Licensed under the Apache License, Version 2.0, see LICENSE for details. |
| # SPDX-License-Identifier: Apache-2.0 |
| |
| from .sim import OTBNSim |
| |
| _TEST_RND_DATA = \ |
| 0x99999999_99999999_99999999_99999999_99999999_99999999_99999999_99999999 |
| |
| |
| class StandaloneSim(OTBNSim): |
| def run(self, verbose: bool) -> int: |
| '''Run until ECALL. |
| |
| Return the number of cycles taken. |
| |
| ''' |
| insn_count = 0 |
| # ISS will stall at start until URND data is valid; immediately set it |
| # valid when in free running mode as nothing else will. |
| self.state.set_urnd_reseed_complete() |
| while self.state.running(): |
| self.step(verbose) |
| insn_count += 1 |
| |
| if self.state.wsrs.RND.pending_request: |
| # If an instruction requests RND data, make it available |
| # immediately. |
| self.state.wsrs.RND.set_unsigned(_TEST_RND_DATA) |
| |
| return insn_count |
