+++ /dev/null
-/* interrupt-pri.h - Definitions and macros related to interrupt prioritization */
-/*
- * Copyright (c) 2002-2004, 2006 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.
- */
-
-#if !defined(_ASMLANGUAGE) && !defined(__ASSEMBLER__)
-# error "The interrupt-pri.h header file is meant for inclusion by assembly source code only."
-#endif
-
-#include <xtensa/coreasm.h>
-#include <xtensa/config/specreg.h>
-#include "xtos-internal.h"
-
-/*
- * The following macros are used by int-lowpri-dispatcher.S to
- * implement prioritized interrupt dispatching and fairness.
- * The prioritization scheme is set by XTOS parameters in xtos-params.h .
- */
-
-
-#if XCHAL_HAVE_INTERRUPTS
-
- // msindex_int
- //
- // Return in register \aindex the index of the first (most significant) bit set
- // in register \amask.
- // Register \amask is clobbered (modified) by this macro.
- //
- // Note: this code is similar to the find_ms_setbit macro in <xtensa/coreasm.h>.
- //
- .macro msindex_int aindex, amask
-# if XCHAL_HAVE_NSA
- nsau \aindex, \amask // \aindex = interrupt index, from 0 to 31, from left to right
- //movi \amask, 31
- //sub \aindex, \amask, \aindex
-# else
- movi \aindex, 0 // start with result of 0 (point to lsbit of 32)
-# if XCHAL_NUM_INTERRUPTS > 16
- bltui \amask, 0x10000, 2f // is it one of the 16 lsbits? (if so, check lower 16 bits)
- addi \aindex, \aindex, 16 // no, increment result to upper 16 bits (of 32)
- extui \amask, \amask, 16, 16 // check upper half (shift right 16 bits)
-2:
-# endif
-# if XCHAL_NUM_INTERRUPTS > 8
- bltui \amask, 0x100, 2f // is it one of the 8 lsbits? (if so, check lower 8 bits)
- addi \aindex, \aindex, 8 // no, increment result to upper 8 bits (of 16)
- srli \amask, \amask, 8 // shift right to check upper 8 bits
-2:
-# endif
-# if XCHAL_NUM_INTERRUPTS > 4
- bltui \amask, 0x10, 2f // is it one of the 4 lsbits? (if so, check lower 4 bits)
- addi \aindex, \aindex, 4 // no, increment result to upper 4 bits (of 8)
- srli \amask, \amask, 4 // shift right 4 bits to check upper half
-2:
-# endif
- bltui \amask, 0x4, 2f // is it one of the 2 lsbits? (if so, check lower 2 bits)
- addi \aindex, \aindex, 2 // no, increment result to upper 2 bits (of 4)
- srli \amask, \amask, 2 // shift right 2 bits to check upper half
-2:
- bltui \amask, 0x2, 2f // is it the lsbit?
- addi \aindex, \aindex, 1 // no, increment result to upper bit (of 2)
-2: // done!
-# endif /*!NSA*/
- // HERE: \aindex = index of interrupt to handle
- // \amask is available
- .endm
-
-
- // msindex_int_nc
- //
- // Same as msindex_int, but does not clobber \amask.
- // Uses extra register \atmp (a temporary register) if needed.
- //
- .macro msindex_int_nc aindex, amask, atmp
-# if XCHAL_HAVE_NSA
- msindex_int \aindex, \amask // does not clobber \amask in this case
-# else
- mov \atmp, \amask
- msindex_int \aindex, \atmp
-# endif
- .endm
-
-
- // indexmask_int
- //
- // Compute index of highest priority interrupt in given mask,
- // and trim mask to single bit corresponding to that interrupt.
- // This is used for interrupt dispatching.
- //
- // Entry:
- // \index = (undefined)
- // \mask = non-zero mask of interrupt bits to consider handling
- // \intptr = &_xtos_intstruct if INTENABLE virtualized, else undefined
- // \tmp = (undefined)
- // Exit:
- // \index = index of interrupt (reversed if NSA present)
- // \mask = single bit corresponding to index
- // \intptr = (preserved)
- // \tmp = (clobbered)
- //
- .macro indexmask_int index, mask, intptr, tmp
-# if XTOS_SUBPRI_ORDER == XTOS_SPO_ZERO_LO
-
- msindex_int \index, \mask // \index = index of msbit set in \mask (\tmp is tmp, \mask clobbered)
- // \index now contains the index of the highest priority pending+enabled interrupt.
-# if XCHAL_HAVE_NSA
- movi \mask, 0x80000000
- ssr \index
- srl \mask, \mask // \mask = single bit set corresponding to interrupt to be processed...
-# else
- movi \mask, 1
- ssl \index
- sll \mask, \mask // \mask = single bit set corresponding to interrupt to be processed...
-# endif
-
-# elif XTOS_SUBPRI_ORDER == XTOS_SPO_ZERO_HI
-
- neg \index, \mask // find lsbit in \mask ...
- and \mask, \index, \mask // ...
- msindex_int_nc \index, \mask, \tmp // \index = index of msbit set in \mask (\tmp is tmp, \mask not clobbered)
-
-# else
-# error Unsupported priority ordering.
-# endif /*SUBPRI_ORDER*/
- .endm
-
-
- // index_int
- //
- // Compute index of highest priority interrupt in given mask.
- // This is used for fairness computations.
- //
- // Entry:
- // \index = (undefined)
- // \mask = non-zero mask of interrupt bits to consider handling
- // \intptr = &_xtos_intptr
- // \tmp = (undefined)
- // Exit:
- // \index = index of interrupt (reversed if NSA present)
- // \mask = (preserved)
- // \intptr = (preserved)
- // \tmp = (clobbered)
- //
- .macro index_int index, mask, intptr, tmp
-# if XTOS_SUBPRI_ORDER == XTOS_SPO_ZERO_LO
- msindex_int_nc \index, \mask, \tmp // \index = index of msbit set in \mask (\mask not clobbered)
-# elif XTOS_SUBPRI_ORDER == XTOS_SPO_ZERO_HI
- neg \tmp, \mask // find lsbit in \mask ...
- and \tmp, \tmp, \mask // ...
- msindex_int \index, \tmp // \index = index of msbit set in \tmp (\tmp is clobbered)
-# else
-# error oops
-# endif
- .endm // index_int
-
-
-#endif /* XCHAL_HAVE_INTERRUPTS */
-
-
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