cpu/NaxRiscv crt0.S now enable the FPU

2023-02-10 15:57:22 +01:00 · 2023-02-10 15:57:22 +01:00 · 34422d2d91
parent ed48fb4d5d
commit 34422d2d91
1 changed files with 9 additions and 0 deletions
--- a/litex/soc/cores/cpu/naxriscv/crt0.S
+++ b/litex/soc/cores/cpu/naxriscv/crt0.S
@ -2,6 +2,11 @@
 .global isr
 .global _start

+#define MSTATUS_FS_INITIAL (1 << 13)
+#define MSTATUS_FS_CLEAN (2 << 13)
+#define MSTATUS_FS_DIRTY (3 << 13)
+#define MSTATUS_FS_MASK (3 << 13)
+
 _start:
  j crt_init
  nop
@ -57,6 +62,10 @@ crt_init:
  la sp, _fstack
  la a0, trap_entry
  csrw mtvec, a0
+  
+enable_fpu:
+  li x1, MSTATUS_FS_INITIAL
+  csrs mstatus, x1

 data_init:
  la a0, _fdata