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lib: sbi: Fix sbi_hart_switch_mode() for u-mode

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We should check and access N-extension CSRs in sbi_hart_switch_mode()
when next_mode is u-mode because N-extension is optional.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-11-21 11:28:39 +05:30
committed by Anup Patel
parent 2677324f90
commit 8d2edc4fc9
1 changed files with 5 additions and 3 deletions
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2
lib/sbi/sbi_hart.c
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@@ -522,10 +522,12 @@ sbi_hart_switch_mode(unsigned long arg0, unsigned long arg1,
csr_write(CSR_SIE, 0); csr_write(CSR_SIE, 0);
csr_write(CSR_SATP, 0); csr_write(CSR_SATP, 0);
} else if (next_mode == PRV_U) { } else if (next_mode == PRV_U) {
if (misa_extension('N')) {
csr_write(CSR_UTVEC, next_addr); csr_write(CSR_UTVEC, next_addr);
csr_write(CSR_USCRATCH, 0); csr_write(CSR_USCRATCH, 0);
csr_write(CSR_UIE, 0); csr_write(CSR_UIE, 0);
} }
}
register unsigned long a0 asm("a0") = arg0; register unsigned long a0 asm("a0") = arg0;
register unsigned long a1 asm("a1") = arg1; register unsigned long a1 asm("a1") = arg1;