diff options
| author | Scott Johnson <scottj@sifive.com> | 2016-12-07 18:01:26 -0800 |
|---|---|---|
| committer | Scott Johnson <scottj@sifive.com> | 2016-12-07 18:01:26 -0800 |
| commit | e0f235fc5344ccf79fa0e5bdd64591aef3814799 (patch) | |
| tree | 8dc928d83205920905f397e2fe34fae65a74246c | |
| parent | 697fadd2946dafaf84bc70413ba26116e872bc5f (diff) | |
Initialize FPU properly
* Only attempts if FPU actually implemented in design
* Also initializes rounding modes, which are undefined at reset
| -rw-r--r-- | bsp/env/freedom-e300-hifive1/init.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/bsp/env/freedom-e300-hifive1/init.c b/bsp/env/freedom-e300-hifive1/init.c index be76f90..343f071 100644 --- a/bsp/env/freedom-e300-hifive1/init.c +++ b/bsp/env/freedom-e300-hifive1/init.c @@ -182,7 +182,10 @@ void _init() printf("core freq at %d Hz\n", get_cpu_freq()); write_csr(mtvec, &handle_trap); - write_csr(mstatus, MSTATUS_FS); // enable FPU + if (read_csr(misa) & (1 << ('F' - 'A'))) { // if F extension is present + write_csr(mstatus, MSTATUS_FS); // allow FPU instructions without trapping + write_csr(fcsr, 0); // initialize rounding mode, undefined at reset + } _exit(main(0, NULL)); } |