| // interrupt-table.S - Interrupt handler table and default handler |
| |
| // Copyright (c) 2004-2010 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. |
| |
| #include <xtensa/coreasm.h> |
| #include <xtensa/config/specreg.h> |
| #include "xtos-internal.h" |
| #ifdef SIMULATOR |
| #include <xtensa/simcall.h> |
| #endif |
| |
| |
| #if XCHAL_HAVE_INTERRUPTS |
| |
| .data |
| |
| .global _xtos_intstruct |
| .align 8 |
| _xtos_intstruct: |
| # if XTOS_VIRTUAL_INTENABLE |
| .global _xtos_enabled |
| .type _xtos_enabled,@object |
| .size _xtos_enabled,4 |
| .global _xtos_vpri_enabled |
| .type _xtos_vpri_enabled,@object |
| .size _xtos_vpri_enabled,4 |
| _xtos_enabled: .word 0 |
| _xtos_vpri_enabled: .word 0xFFFFFFFF |
| # endif |
| # if XTOS_VIRTUAL_INTERRUPT |
| # error Virtualized INTERRUPT register not yet supported. |
| .global _xtos_pending |
| .type _xtos_pending,@object |
| .size _xtos_pending,4 |
| _xtos_pending: .word 0 |
| # endif |
| |
| /* |
| * Table of C-level interrupt handlers (and args, etc) for each interrupt. |
| * NOTE: if the NSA/NSAU instructions are configured, then to save a few |
| * cycles in the interrupt dispatcher code, this table is filled in reverse. |
| * C code uses the MAPINT() macro defined in xtos-internal.h to index entries. |
| * NOTE: Under some conditions (turned off by default in xtos-params.h), |
| * this table gets properly initialized by the _xtos_init() function in |
| * init.c . NOTA: A future enhancement may be to always configure |
| * and build this table at build-time rather than ever doing it at run-time. |
| */ |
| #define i .Li /* workaround a silly GDB testsuite regression */ |
| .data |
| .global _xtos_interrupt_table |
| .align 8 |
| _xtos_interrupt_table: |
| .set i, XCHAL_HAVE_NSA*(XCHAL_NUM_INTERRUPTS-1) |
| .rept XCHAL_NUM_INTERRUPTS |
| .word _xtos_unhandled_interrupt |
| .word i // parameter: interrupt number |
| .set i, i+1-(XCHAL_HAVE_NSA*2) |
| .endr |
| |
| # if XIE_EXTEND |
| /* MUST *IMMEDIATELY* follow _xtos_interrupt_table: */ |
| .global _xtos_interrupt_mask_table |
| _xtos_interrupt_mask_table: |
| .set i, XCHAL_HAVE_NSA*(XCHAL_NUM_INTERRUPTS-1) |
| .rept XCHAL_NUM_INTERRUPTS |
| /* Default to all low-priority (level-one) interrupts at their own virtual priority: */ |
| # if XTOS_SUBPRI_ORDER == XTOS_SPO_ZERO_HI |
| .word ((1<<i)-1) | ~XCHAL_LOWPRI_MASK // vpri_mask default - lower-numbered ints (and high/medium-pri ints) pre-empt other low-pri ints |
| # else |
| .word (-2*(1<<i)) | ~XCHAL_LOWPRI_MASK // vpri_mask default - higher-numbered ints (and high/medium-pri ints) pre-empt other low-pri ints |
| # endif |
| .word (1<<i) // level_mask default - each low-pri (level-one) interrupt at its own subpriority |
| .set i, i+1-(XCHAL_HAVE_NSA*2) |
| .endr |
| # endif /*XIE_EXTEND*/ |
| |
| #endif /* XCHAL_HAVE_INTERRUPTS */ |
| |
| .text |
| |
| |
| |
| #if XCHAL_HAVE_INTERRUPTS |
| |
| // |
| // void _xtos_unhandled_interrupt( int n ); |
| // |
| // Default/empty interrupt handler. |
| // This is used for interrupts with no registered handler. |
| // Parameter n is the interrupt number (0 thru 31). |
| // |
| .text |
| .align 4 |
| .global _xtos_unhandled_interrupt |
| .type _xtos_unhandled_interrupt,@function |
| _xtos_unhandled_interrupt: |
| abi_entry |
| # if XCHAL_HAVE_DEBUG |
| // Break into the debugger if one is present and active: |
| # if XCHAL_NUM_INTLEVELS > XCHAL_DEBUGLEVEL |
| rsil a3, XCHAL_DEBUGLEVEL-1 // ensure break takes effect |
| # endif |
| break 1, 15 // unhandled (unregistered) interrupt $a2 |
| //# elif defined(SIMULATOR) |
| // addmi a2, a2, SYS_unhandled_interrupt ... |
| // simcall // unhandled interrupt |
| # else |
| 1: j 1b // unhandled interrupt - loop forever |
| # endif |
| abi_return |
| |
| .size _xtos_unhandled_interrupt, . - _xtos_unhandled_interrupt |
| |
| #endif /* XCHAL_HAVE_INTERRUPTS */ |
| |