148 lines
6.0 KiB
C
148 lines
6.0 KiB
C
/*
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* Copyright (c) 2016 Cadence Design Systems, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*******************************************************************************
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Configuration-specific information for Xtensa build. This file must be
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included in FreeRTOSConfig.h to properly set up the config-dependent
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parameters correctly.
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NOTE: To enable thread-safe C library support, XT_USE_THREAD_SAFE_CLIB must
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be defined to be > 0 somewhere above or on the command line.
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*******************************************************************************/
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#ifndef XTENSA_CONFIG_H
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#define XTENSA_CONFIG_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <xtensa/hal.h>
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#include <xtensa/config/core.h>
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#include <xtensa/config/system.h> /* required for XSHAL_CLIB */
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#include "xtensa_context.h"
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/*-----------------------------------------------------------------------------
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* STACK REQUIREMENTS
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*
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* This section defines the minimum stack size, and the extra space required to
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* be allocated for saving coprocessor state and/or C library state information
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* (if thread safety is enabled for the C library). The sizes are in bytes.
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*
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* Stack sizes for individual tasks should be derived from these minima based on
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* the maximum call depth of the task and the maximum level of interrupt nesting.
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* A minimum stack size is defined by XT_STACK_MIN_SIZE. This minimum is based
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* on the requirement for a task that calls nothing else but can be interrupted.
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* This assumes that interrupt handlers do not call more than a few levels deep.
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* If this is not true, i.e. one or more interrupt handlers make deep calls then
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* the minimum must be increased.
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*
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* If the Xtensa processor configuration includes coprocessors, then space is
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* allocated to save the coprocessor state on the stack.
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*
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* If thread safety is enabled for the C runtime library, (XT_USE_THREAD_SAFE_CLIB
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* is defined) then space is allocated to save the C library context in the TCB.
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*
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* Allocating insufficient stack space is a common source of hard-to-find errors.
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* During development, it is best to enable the FreeRTOS stack checking features.
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*
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* Usage:
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*
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* XT_USE_THREAD_SAFE_CLIB -- Define this to a nonzero value to enable thread-safe
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* use of the C library. This will require extra stack
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* space to be allocated for tasks that use the C library
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* reentrant functions. See below for more information.
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*
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* NOTE: The Xtensa toolchain supports multiple C libraries and not all of them
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* support thread safety. Check your core configuration to see which C library
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* was chosen for your system.
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*
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* XT_STACK_MIN_SIZE -- The minimum stack size for any task. It is recommended
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* that you do not use a stack smaller than this for any
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* task. In case you want to use stacks smaller than this
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* size, you must verify that the smaller size(s) will work
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* under all operating conditions.
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*
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* XT_STACK_EXTRA -- The amount of extra stack space to allocate for a task
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* that does not make C library reentrant calls. Add this
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* to the amount of stack space required by the task itself.
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*
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* XT_STACK_EXTRA_CLIB -- The amount of space to allocate for C library state.
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*
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-----------------------------------------------------------------------------*/
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/* Extra space required for interrupt/exception hooks. */
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#ifdef XT_INTEXC_HOOKS
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#ifdef __XTENSA_CALL0_ABI__
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#define STK_INTEXC_EXTRA 0x200
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#else
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#define STK_INTEXC_EXTRA 0x180
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#endif
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#else
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#define STK_INTEXC_EXTRA 0
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#endif
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/* Check C library thread safety support and compute size of C library save area. */
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#if XT_USE_THREAD_SAFE_CLIB > 0u
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#if XSHAL_CLIB == XTHAL_CLIB_XCLIB
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#define XT_HAVE_THREAD_SAFE_CLIB 0
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#error Thread-safe operation is not yet supported for the XCLIB C library.
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#elif XSHAL_CLIB == XTHAL_CLIB_NEWLIB
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#define XT_HAVE_THREAD_SAFE_CLIB 1
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#if !defined __ASSEMBLER__
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#include <sys/reent.h>
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#define XT_CLIB_CONTEXT_AREA_SIZE ((sizeof(struct _reent) + 15) + (-16))
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#define XT_CLIB_GLOBAL_PTR _impure_ptr
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#endif
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#else
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#define XT_HAVE_THREAD_SAFE_CLIB 0
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#error The selected C runtime library is not thread safe.
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#endif
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#else
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#define XT_CLIB_CONTEXT_AREA_SIZE 0
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#endif
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/*------------------------------------------------------------------------------
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Extra size -- interrupt frame plus coprocessor save area plus hook space.
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NOTE: Make sure XT_INTEXC_HOOKS is undefined unless you really need the hooks.
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------------------------------------------------------------------------------*/
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#ifdef __XTENSA_CALL0_ABI__
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#define XT_XTRA_SIZE (XT_STK_FRMSZ + STK_INTEXC_EXTRA + 0x10 + XT_CP_SIZE)
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#else
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#define XT_XTRA_SIZE (XT_STK_FRMSZ + STK_INTEXC_EXTRA + 0x20 + XT_CP_SIZE)
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#endif
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/*------------------------------------------------------------------------------
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Space allocated for user code -- function calls and local variables.
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NOTE: This number can be adjusted to suit your needs. You must verify that the
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amount of space you reserve is adequate for the worst-case conditions in your
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application.
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NOTE: The windowed ABI requires more stack, since space has to be reserved
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for spilling register windows.
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------------------------------------------------------------------------------*/
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#ifdef __XTENSA_CALL0_ABI__
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#define XT_USER_SIZE 0x200
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#else
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#define XT_USER_SIZE 0x400
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#endif
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/* Minimum recommended stack size. */
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#define XT_STACK_MIN_SIZE ((XT_XTRA_SIZE + XT_USER_SIZE) / sizeof(unsigned char))
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/* OS overhead with and without C library thread context. */
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#define XT_STACK_EXTRA (XT_XTRA_SIZE)
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#define XT_STACK_EXTRA_CLIB (XT_XTRA_SIZE + XT_CLIB_CONTEXT_AREA_SIZE)
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#ifdef __cplusplus
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}
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#endif
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#endif /* XTENSA_CONFIG_H */
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