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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. #ifndef __LIBC__ppc32__THREAD_H__
  30. #define __LIBC__ppc32__THREAD_H__
  31.  
  32. #define PPC_TP_OFFSET 0x7000
  33.  
  34. typedef struct {
  35.     void *pst_data;
  36. } tcb_t;
  37.  
  38. static inline void __tcb_set(tcb_t *tcb)
  39. {
  40.     void *tp = tcb;
  41.     tp += PPC_TP_OFFSET + sizeof(tcb_t);
  42.    
  43.     asm volatile (
  44.         "mr %%r2, %0\n"
  45.         :
  46.         : "r" (tp)
  47.     );
  48. }
  49.  
  50. static inline tcb_t * __tcb_get(void)
  51. {
  52.     void * retval;
  53.    
  54.     asm volatile (
  55.         "mr %0, %%r2\n"
  56.         : "=r" (retval)
  57.     );
  58.  
  59.     return (tcb_t *)(retval - PPC_TP_OFFSET - sizeof(tcb_t));
  60. }
  61.  
  62. #endif
  63.