diff options
| author | Li Jinpei <leekingp1994@163.com> | 2020-02-11 15:37:24 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-02-13 09:10:57 +0530 |
| commit | 897b8fbdd92fcfad194417d348b8dad16ab0e17a (patch) | |
| tree | cab2199681b64d28c865937d121cee8bef9efe99 /lib/sbi/riscv_asm.c | |
| parent | 179eddeb9ca5fc1869d40696e0d4cd9899b9d92d (diff) | |
lib: Use __builtin_ctzl() in pmp_get()
We should should __builtin_ctzl() in pmp_get() instead of
custom ctz() function.
Signed-off-by: Li Jinpei <leekingp1994@163.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib/sbi/riscv_asm.c')
| -rw-r--r-- | lib/sbi/riscv_asm.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/lib/sbi/riscv_asm.c b/lib/sbi/riscv_asm.c index 7b612d4..68f5f17 100644 --- a/lib/sbi/riscv_asm.c +++ b/lib/sbi/riscv_asm.c @@ -184,18 +184,6 @@ void csr_write_num(int csr_num, unsigned long val) }; } -static unsigned long ctz(unsigned long x) -{ - unsigned long ret = 0; - - while (!(x & 1UL)) { - ret++; - x = x >> 1; - } - - return ret; -} - int pmp_set(unsigned int n, unsigned long prot, unsigned long addr, unsigned long log2len) { @@ -287,7 +275,7 @@ int pmp_get(unsigned int n, unsigned long *prot_out, unsigned long *addr_out, addr = 0; log2len = __riscv_xlen; } else { - t1 = ctz(~addr); + t1 = __builtin_ctzl(~addr); addr = (addr & ~((1UL << t1) - 1)) << PMP_SHIFT; log2len = (t1 + PMP_SHIFT + 1); } |