c5a62dcc9c
Nios II has no special instructions for testing bits, ffs, etc. However, when poking memory-mapped peripherals, special *io variants of ld and st instructions must be used to avoid issues with the caches. find_msb_set / find_lsb_set are implemented using universal GCC compiler built-ins. It's not clear why this approach was not taken on other arches. The sys_in/sys_out/sys_io functions are completely removed as there is no concept of these on Nios II. sys_read/sys_write functions implemented using special GCC builtins for the Nios II so that we don't have to use inline assembly. Rest of the operations implemented in C, there is no requirement that they be atomic. Change-Id: Ic251fc7d7f342543dace4ccb3e429937b303215e Signed-off-by: Andrew Boie <andrew.p.boie@intel.com> |
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| arc | ||
| arm | ||
| nios2 | ||
| x86 | ||
| cpu.h | ||