+++ /dev/null
-/*
- * xtos-params.h -- user-settable parameters for XTOS single-threaded run-time
- *
- * Copyright (c) 2002, 2004, 2006-2007 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.
- */
-
-#ifndef XTOS_PARAMS_H
-#define XTOS_PARAMS_H
-
-/*
- * IMPORTANT NOTE.
- * This file contains XTOS parameters that may be modified
- * according to needs. HOWEVER, any modifications are NOT
- * supported. Handling of parameters other than the defaults
- * provided in the original version of this file are for
- * illustrative and educational purposes only. If you do
- * change the parameters here-in (which requires rebuilding
- * XTOS), please verify the resulting code extensively
- * before even considering its use in production code.
- *
- * To rebuild XTOS, see instructions in the Xtensa System Software
- * Reference Manual. The following sequence is no longer supported.
- *
- * cd <config_dir>/xtensa-elf/src/handlers
- * xt-make clean
- * xt-make
- * xt-make install
- *
- * (Note: the last step installs the modified XTOS in *ALL*
- * LSPs that normally include XTOS. You may prefer copying
- * the generated files to your own custom LSP instead. Or
- * better yet, also make a copy of all source files and maintain
- * them somewhere completely separate -- which may require
- * minor adjustments to the makefile.)
- *
- * PERFORMANCE TUNING:
- * To slightly improve performance of interrupt dispatching,
- * you can do some combination of the following:
- * - change XTOS_SUBPRI to zero
- * - change XTOS_SUBPRI_GROUPS to zero
- * - change XTOS_SUBPRI_ORDER to XTOS_SPO_ZERO_HI
- * - change XTOS_DEBUG_PC to zero
- * - change XTOS_INT_FAIRNESS to zero
- * - change XTOS_CNEST to zero
- * There are non-trivial trade-offs in making such changes however,
- * such as loss of support (see important note above), loss of
- * interrupt scheduling fairness, loss of ability to traceback
- * interrupt handlers across interrupted code when debugging them,
- * loss of supported for nested C functions, etc.
- */
-
-
-/*
- * Lower LOCKLEVEL to XCHAL_EXCM_LEVEL for improved interrupt latency
- * if you don't register C handlers for high-priority interrupts and your
- * high-priority handlers don't touch INTENABLE nor virtual priorities.
- *
- * XTOS_LOCKLEVEL is less meaningful but still relevant if XEA2 and SUBPRI is zero,
- * ie. if INTENABLE doesn't get virtualized (XTOS_VIRTUAL_INTENABLE not set);
- * in this case, it is the interrupt level at which INTENABLE accesses are guarded,
- * so that interrupt handlers up to this level can safely manipulate INTENABLE.
- */
-#define XTOS_LOCKLEVEL XCHAL_NUM_INTLEVELS /* intlevel of INTENABLE register virtualization
- (minimum is EXCM_LEVEL) */
-
-/*
- * NOTE: the following four parameters (SUBPRI, SUBPRI_GROUPS, SUBPRI_ORDER, INT_FAIRNESS)
- * are irrelevant and ignored for interrupt vectors to which only one interrupt is mapped.
- */
-
-#define XTOS_SUBPRI 1 /* set to 0 if you don't need sub-prioritization
- within level-one interrupts via software;
- for XEA2 configs, this might improve performance of
- certain sections of code, because INTENABLE register
- virtualization becomes unnecessary in this case */
-
-/* Ignored unless SUBPRI set: */
-#define XTOS_SUBPRI_GROUPS 1 /* support selective grouping of interrupts at the same priority */
-
-#define XTOS_SUBPRI_ORDER XTOS_SPO_ZERO_LO /* one of XTOS_SPO_ZERO_LO, XTOS_SPO_ZERO_HI */
-
-/* Ignored if SUBPRI set but SUBPRI_GROUPS is not (single interrupt per subpri),
- * or if single interrupt configured at level/vector: */
-#define XTOS_INT_FAIRNESS 1 /* disable round-robin/fifo scheduling of interrupt
- handlers of a given level or sub-priority */
-
-
-#define XTOS_DEBUG_PC 1 /* enable nice stack traceback showing interrupted code
- when debugging interrupt or exception handler;
- not implemented for high-priority handlers, or
- for call0 ABI */
-
-#define XTOS_CNEST 1 /* enable support for nested C functions
- (save/restore nested C function call-chain pointer) */
-
-/* Current compilers only use ACC (not MRn) when MAC16 is enabled, so you can leave this 0 for performance: */
-#define XTOS_SAVE_ALL_MAC16 0 /* set to save/restore MAC16 MRn registers */
-
-/* Setting this might be useful to clear X's in hardware simulation a bit earlier, but
- * should not be needed in production code: */
-#define XTOS_RESET_UNNEEDED 0 /* set to reset more registers than are really needed */
-
-#endif /* XTOS_PARAMS_H */
-
projects / open-ath9k-htc-firmware.git / blobdiff