tree 8a8a950aec792b3b22133e9f34281fc24746cd25
parent 8330c4c823a021cf4af5eed4cdf8e14bf479ff9a
author Alphan Ulusoy <alphan@google.com> 1579636981 -0500
committer Philipp Wagner <mail@philipp-wagner.com> 1580405867 +0000

Fix busy_sleep_micros and ibex_busy_loop

- Implement `ibex_mcycle_read()` that reads the 64-bit cycle counter
value stored across `mcycleh` and `mcycle`.
- `busy_sleep_micros(size_t)`:
  - Rename to `usleep(uint32_t)`.
  - Fix divisor (should be `1000000`, had an extra `0`).
  - Use a `uint64_t` to store the number of cycles instead of `uint32_t`.
  - Replace the call to `ibex_busy_loop(size_t)` with a loop +
`ibex_mcycle_read()`.
- Remove `ibex_busy_loop(size_t)`.

See also: #1227, #1207.

Signed-off-by: Alphan Ulusoy <alphan@google.com>