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/*
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 * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
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 * All rights reserved.
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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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 * - 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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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup libcarm32
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 * @{
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 */
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/** @file
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 *  @brief Uspace threads and TLS.
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 */
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#ifndef LIBC_arm32_THREAD_H_
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#define LIBC_arm32_THREAD_H_
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#include <unistd.h>
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/** Stack initial size. */
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#define THREAD_INITIAL_STACK_PAGES_NO 1
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/** Offsets for accessing __thread variables are shifted 8 bytes higher. */
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#define ARM_TP_OFFSET   (-8)
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/** TCB (Thread Control Block) struct.
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 *
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 *  TLS starts just after this struct.
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 */
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typedef struct {
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    /** Fibril data. */
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    void *fibril_data;
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} tcb_t;
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/** Sets TLS address to the r9 register.
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 *
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 *  @param tcb TCB (TLS starts behind)
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 */
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static inline void __tcb_set(tcb_t *tcb)
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{
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    void *tls = (void *) tcb;
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    tls += sizeof(tcb_t) + ARM_TP_OFFSET;
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    asm volatile (
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        "mov r9, %0"
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        :
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        : "r"(tls)
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    );
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}
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/** Returns TCB address.
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 *
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 * @return TCB address (starts before TLS which address is stored in r9 register).
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 */
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static inline tcb_t *__tcb_get(void)
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{
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    void *ret;
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    asm volatile (
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        "mov %0, r9"
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        : "=r"(ret)
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    );
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    return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t));
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}
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/** Returns TLS address stored.
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 *
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 *  Implemented in assembly.
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 *
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 *  @return TLS address stored in r9 register
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 */
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extern uintptr_t __aeabi_read_tp(void);
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#endif
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/** @}
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 */