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  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 libcppc32  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef LIBC_ppc32_THREAD_H_
  36. #define LIBC_ppc32_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.  */
  72.