uspace/libc/arch/ppc64/include/thread.h

   1 /*
   2  * Copyright (c) 2006 Martin Decky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup libcppc64
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #ifndef LIBC_ppc64_THREAD_H_
  36 #define LIBC_ppc64_THREAD_H_
  37
  38 #define PPC_TP_OFFSET 0x7000
  39
  40 typedef struct {
  41         void *pst_data;
  42 } tcb_t;
  43
  44 static inline void __tcb_set(tcb_t *tcb)
  45 {
  46         void *tp = tcb;
  47         tp += PPC_TP_OFFSET + sizeof(tcb_t);
  48
  49         asm volatile (
  50                 "mr %%r2, %0\n"
  51                 :
  52                 : "r" (tp)
  53         );
  54 }
  55
  56 static inline tcb_t * __tcb_get(void)
  57 {
  58         void * retval;
  59
  60         asm volatile (
  61                 "mr %0, %%r2\n"
  62                 : "=r" (retval)
  63         );
  64
  65         return (tcb_t *)(retval - PPC_TP_OFFSET - sizeof(tcb_t));
  66 }
  67
  68 #endif
  69
  70 /** @}
  71  */