forked from Mirrors/opensbi

Implement the test which covers some of the functions from the `riscv_atomic.h` header file. The test contains 9 test cases: 1) atomic read/write test 2) add/return test 3) sub/return test 4) cmpxchg test 5) atomic_xchg test 6) atomic_raw_set_bit test 7) atomic_raw_clear_bit test 8) atomic_set_bit test 9) atomic_clear_bit test Some of the test cases operate on the `test_atomic` variable. It gets initialized in the suite init function. Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com> Reviewed-by: Anup Patel <anup@brainfault.org>