diff options
Diffstat (limited to 'src/arch/riscv')
| -rw-r--r-- | src/arch/riscv/virtual_memory.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/src/arch/riscv/virtual_memory.c b/src/arch/riscv/virtual_memory.c index aceb72eebd..2c440d24aa 100644 --- a/src/arch/riscv/virtual_memory.c +++ b/src/arch/riscv/virtual_memory.c @@ -310,14 +310,12 @@ void mstatus_init(void) set_csr(medeleg, delegate); - /* Enable all user/supervisor-mode counters */ - /* We'll turn these on once lowrisc gets their bitstream up to - * 1.9. Right now there's no agreement on the values for these - * architectural registers. - */ - // write_csr(mscounteren, 0b111); - // write_csr(mucounteren, 0b111); - - // for SPIKE: - // write_csr(/*mscounteren*/0x321, 0b111); + // Enable all user/supervisor-mode counters using + // v1.9.1 register addresses. + // They moved from the earlier spec. + // Until we trust our toolchain use the hardcoded constants. + // These were in flux and people who get the older toolchain + // will have difficult-to-debug failures. + write_csr(/*mucounteren*/0x320, 7); + write_csr(/*mscounteren*/0x321, 7); } |