| // |
| // miscellaneous.S - miscellaneous assembly language routines |
| // |
| // $Id: //depot/rel/Foxhill/dot.8/Xtensa/OS/hal/miscellaneous.S#1 $ |
| |
| // Copyright (c) 2011 Tensilica Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining |
| // a copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to |
| // permit persons to whom the Software is furnished to do so, subject to |
| // the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| #include <xtensa/cacheasm.h> |
| #include <xtensa/cacheattrasm.h> |
| #include <xtensa/xtensa-versions.h> |
| |
| |
| .text |
| |
| //---------------------------------------------------------------------- |
| // Clear any remnant register state pointing to (or containing) code. |
| // Specifically, clear loop registers (LCOUNT) to avoid hardware loopback |
| // from LEND to LBEGIN when new code is loaded where code containing a |
| // zero-overhead loop was located. See the HAL chapter of the Tensilica |
| // System Software Reference Manual for details on the use of this function. |
| //---------------------------------------------------------------------- |
| |
| #if defined(__SPLIT__clear_regcached_code) || \ |
| defined(__SPLIT__clear_regcached_code_nw) |
| |
| DECLFUNC(xthal_clear_regcached_code) |
| abi_entry |
| # if XCHAL_HAVE_LOOPS |
| movi a2, 0 |
| wsr.lcount a2 |
| # endif |
| isync_retw_nop |
| abi_return |
| endfunc |
| |
| #endif |
| |
