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https://github.com/zephyrproject-rtos/zephyr
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02b20351cd
This adds the common struct fields and functions to support the implementation of thread local storage in individual architecture. This uses the thread stack to store TLS data. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/*
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* Copyright (c) 2020 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Kernel Thread Local Storage APIs.
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*
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* Kernel APIs related to thread local storage.
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*/
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#ifndef ZEPHYR_KERNEL_INCLUDE_KERNEL_TLS_H_
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#define ZEPHYR_KERNEL_INCLUDE_KERNEL_TLS_H_
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#include <linker/linker-defs.h>
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/**
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* @brief Return the total size of TLS data/bss areas
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*
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* This returns the total size of thread local storage (TLS)
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* data and bss areas as defined in the linker script.
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* Note that this does not include any architecture specific
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* bits required for proper functionality of TLS.
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*
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* @return Total size of TLS data/bss areas
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*/
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static inline size_t z_tls_data_size(void)
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{
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return (size_t)__tls_size;
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}
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/**
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* @brief Copy the TLS data/bss areas into destination
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*
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* This copies the TLS data into destination and clear the area
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* of TLS bss size after the data section.
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*
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* @param dest Pointer to destination
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*/
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static inline void z_tls_copy(char *dest)
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{
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size_t tdata_size = (size_t)__tdata_size;
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size_t tbss_size = (size_t)__tbss_size;
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/* Copy initialized data (tdata) */
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memcpy(dest, __tdata_start, tdata_size);
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/* Clear BSS data (tbss) */
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dest += tdata_size;
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memset(dest, 0, tbss_size);
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}
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#endif /* ZEPHYR_KERNEL_INCLUDE_KERNEL_TLS_H_ */
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