diff options
| author | Atish Patra <atish.patra@wdc.com> | 2020-05-09 16:47:25 -0700 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-05-10 09:59:24 +0530 |
| commit | 13ca20d8df3b402d12e5701c651a53409db167d8 (patch) | |
| tree | c7afbf73b0047ab7534379f64f465c86ea1fcea6 /lib/sbi/sbi_math.c | |
| parent | aef9a60d521a7810557d1caf826311bc349691ac (diff) | |
lib: Create a separate math helper function file
There may be few common mathematics helper functions which can be used
anywhere in OpenSBI project.
Add a separate math helper function file to add these functions.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Diffstat (limited to 'lib/sbi/sbi_math.c')
| -rw-r--r-- | lib/sbi/sbi_math.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/sbi/sbi_math.c b/lib/sbi/sbi_math.c new file mode 100644 index 0000000..8ba0831 --- /dev/null +++ b/lib/sbi/sbi_math.c @@ -0,0 +1,23 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2020 Western Digital Corporation or its affiliates. + * + * Common helper functions used across OpenSBI project. + * + * Authors: + * Atish Patra <atish.patra@wdc.com> + */ + +unsigned long log2roundup(unsigned long x) +{ + unsigned long ret = 0; + + while (ret < __riscv_xlen) { + if (x <= (1UL << ret)) + break; + ret++; + } + + return ret; +} |