summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorScott Johnson <scottj@sifive.com>2016-12-07 18:05:38 -0800
committerGitHub <noreply@github.com>2016-12-07 18:05:38 -0800
commit7011ca48a2ef9205184a03a854ba310ebcda0e40 (patch)
tree3264e0a12875a55a1d2458bb254faabbab2cc081
parent9ad15e8896557e9526a12e868801ed5e7d320298 (diff)
parente0f235fc5344ccf79fa0e5bdd64591aef3814799 (diff)
Merge pull request #17 from sifive/enable-fpu
Enable FPU in MSTATUS CSR during init
-rw-r--r--bsp/env/freedom-e300-hifive1/init.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/bsp/env/freedom-e300-hifive1/init.c b/bsp/env/freedom-e300-hifive1/init.c
index d085f6c..343f071 100644
--- a/bsp/env/freedom-e300-hifive1/init.c
+++ b/bsp/env/freedom-e300-hifive1/init.c
@@ -182,6 +182,10 @@ void _init()
printf("core freq at %d Hz\n", get_cpu_freq());
write_csr(mtvec, &handle_trap);
+ 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));
}