| // nmi-vector.S -- Standalone NMI Interrupt Vector/Handler |
| // $Id: //depot/rel/Foxhill/dot.8/Xtensa/OS/xtos/nmi-vector.S#1 $ |
| |
| // Copyright (c) 2003, 2006, 2010 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. |
| |
| // The NMI exception vector handles non-maskable interrupts. |
| |
| #include <xtensa/coreasm.h> |
| #include <xtensa/config/system.h> |
| |
| #if XCHAL_HAVE_NMI |
| |
| .begin literal_prefix .NMIExceptionVector |
| .section .NMIExceptionVector.text, "ax" |
| |
| .align 4 |
| .global _NMIExceptionVector |
| _NMIExceptionVector: |
| |
| // Insert any custom NMI handling code here. |
| // For example: |
| // writesr excsave XCHAL_NMILEVEL a0 |
| // movi a0, ...address of some save area specific to this code... |
| // s32i a1, a0, 0 // save whatever registers are needed |
| // : |
| // do something useful ... |
| // : |
| // l32i a1, a0, 0 // restore whatever registers were saved |
| // readsr excsave XCHAL_NMILEVEL a0 |
| // |
| // This default NMI handler does not do anything. It just returns |
| // immediately upon any occurrence of a non-maskable interrupt. |
| |
| rfi XCHAL_NMILEVEL |
| |
| .size _NMIExceptionVector, . - _NMIExceptionVector |
| .text |
| .end literal_prefix |
| |
| #endif /* XCHAL_HAVE_NMI */ |
| |
