diff options
| -rw-r--r-- | lib/sbi/sbi_hart.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index 30d8aefe..fc86e9f3 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -522,9 +522,11 @@ sbi_hart_switch_mode(unsigned long arg0, unsigned long arg1, csr_write(CSR_SIE, 0); csr_write(CSR_SATP, 0); } else if (next_mode == PRV_U) { - csr_write(CSR_UTVEC, next_addr); - csr_write(CSR_USCRATCH, 0); - csr_write(CSR_UIE, 0); + if (misa_extension('N')) { + csr_write(CSR_UTVEC, next_addr); + csr_write(CSR_USCRATCH, 0); + csr_write(CSR_UIE, 0); + } } register unsigned long a0 asm("a0") = arg0; |