116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/****************************************************************************
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* include/nuttx/tls.h
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_TLS_H
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#define __INCLUDE_NUTTX_TLS_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#ifdef CONFIG_TLS
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifndef CONFIG_TLS_LOG2_MAXSTACK
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# error CONFIG_TLS_LOG2_MAXSTACK is not defined
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#endif
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/* TLS Definitions **********************************************************/
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#define TLS_STACK_ALIGN (1L << CONFIG_TLS_LOG2_MAXSTACK)
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#define TLS_STACK_MASK (TLS_STACK_ALIGN - 1)
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#define TLS_MAXSTACK (TLS_STACK_ALIGN)
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#define TLS_INFO(sp) ((FAR struct tls_info_s *)((sp) & ~TLS_STACK_MASK))
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* When TLS is enabled, up_createstack() will align allocated stacks to the
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* TLS_STACK_ALIGN value. An instance of the following structure will be
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* implicitly positioned at the "lower" end of the stack. Assuming a
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* "push down" stack, this is at the "far" end of the stack (and can be
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* clobbered if the stack overflows).
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*
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* If an MCU has a "push up" then that TLS structure will lie at the top
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* of the stack and stack allocation and initialization logic must take
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* care to preserve this structure content.
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*
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* The stack memory is fully accessible to user mode threads but will
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* contain references to OS internal, private data structures (such as the
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* TCB)
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*/
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struct tcb_s; /* Forward reference */
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struct tls_info_s
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{
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FAR struct tcb_s *tl_tcb; /* The TCB of the current task */
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: tls_cpu_index
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*
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* Description:
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* Return an index in the range of 0 through (CONFIG_SMP_NCPUS-1) that
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* corresponds to the currently executing CPU. This is index is retained
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* in the task TCB which is accessible via the tls_info_s structure.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* An integer index in the range of 0 through (CONFIG_SMP_NCPUS-1) that
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* corresponds to the currently executing CPU.
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*
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****************************************************************************/
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#ifdef CONFIG_SMP
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int tls_cpu_index(void);
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#endif
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#endif /* CONFIG_TLS */
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#endif /* __INCLUDE_NUTTX_TLS_H */
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