enable fpu

2021-01-10 12:06:11 +08:00 · 2021-01-10 12:06:11 +08:00 · 04fe5a7498
parent 862aa8c188
commit 04fe5a7498
1 changed files with 5 additions and 0 deletions
--- a/am/src/nemu/isa/riscv/boot/start.S
+++ b/am/src/nemu/isa/riscv/boot/start.S
@ -2,7 +2,12 @@
 .globl _start
 .type _start, @function

+#define MSTATUS_FS 0x00006000
+
 _start:
  mv s0, zero
  la sp, _stack_pointer
+  li a0, MSTATUS_FS & (MSTATUS_FS >> 1)
+  csrs mstatus, a0
+  csrwi fcsr, 0
  jal _trm_init