lib: pmp_set/pmp_get moved errors from runtime to compile time

pmp_set/pmp_get calculates the location of the CSR register separately
through conditional compilation. In the case of non-32-bit and 64-bit,
we can report an error directly through #error without putting it at
runtime

Signed-off-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

diff --git a/lib/sbi/riscv_asm.c b/lib/sbi/riscv_asm.c
index 847bdba..5eab1ed 100644 (file)
--- a/lib/sbi/riscv_asm.c
+++ b/lib/sbi/riscv_asm.c
@@ -261,7 +261,7 @@ int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
        pmpcfg_csr   = (CSR_PMPCFG0 + (n >> 2)) & ~1;
        pmpcfg_shift = (n & 7) << 3;
 #else
-       return SBI_ENOTSUPP;
+# error "Unexpected __riscv_xlen"
 #endif
        pmpaddr_csr = CSR_PMPADDR0 + n;
 
@@ -312,7 +312,7 @@ int pmp_get(unsigned int n, unsigned long *prot_out, unsigned long *addr_out,
        pmpcfg_csr   = (CSR_PMPCFG0 + (n >> 2)) & ~1;
        pmpcfg_shift = (n & 7) << 3;
 #else
-       return SBI_ENOTSUPP;
+# error "Unexpected __riscv_xlen"
 #endif
        pmpaddr_csr = CSR_PMPADDR0 + n;