pt-machine.h 2.1 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. ARM version.
  3. Copyright (C) 1997, 1998 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. Contributed by Philip Blundell <philb@gnu.org>.
  6. The GNU C Library is free software; you can redistribute it and/or
  7. modify it under the terms of the GNU Library General Public License as
  8. published by the Free Software Foundation; either version 2 of the
  9. License, or (at your option) any later version.
  10. The GNU C Library is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. Library General Public License for more details.
  14. You should have received a copy of the GNU Library General Public
  15. License along with the GNU C Library; see the file COPYING.LIB. If not,
  16. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17. Boston, MA 02111-1307, USA. */
  18. #ifndef _PT_MACHINE_H
  19. #define _PT_MACHINE_H 1
  20. #include <features.h>
  21. #ifndef PT_EI
  22. # define PT_EI __extern_always_inline
  23. #endif
  24. /* Spinlock implementation; required. */
  25. /* it is weird and dangerous to disable interrupt in userspace, but for nios
  26. what else we can do before we have a swap like instruction? This is better
  27. than nothing
  28. */
  29. PT_EI long int
  30. testandset (int *spinlock)
  31. {
  32. unsigned int ret;
  33. __asm__ __volatile__("pfx 8\n\t"
  34. "wrctl %1 ; disable interrupt\n\t"
  35. "nop\n\t"
  36. "nop\n\t"
  37. "ld %0, [%2]\n\t"
  38. "st [%2], %1\n\t"
  39. "pfx 9\n\t"
  40. "wrctl %1 ; enable interrupt\n\t"
  41. "nop\n\t"
  42. "nop\n\t"
  43. : "=&r"(ret)
  44. : "r"(1), "r"(spinlock)
  45. : "memory");
  46. return ret;
  47. }
  48. /* Get some notion of the current stack. Need not be exactly the top
  49. of the stack, just something somewhere in the current frame. */
  50. #define CURRENT_STACK_FRAME stack_pointer
  51. register char * stack_pointer __asm__ ("%sp");
  52. /* nios needs more because of reg windows */
  53. #define THREAD_MANAGER_STACK_SIZE (32*1024)
  54. #define STACK_SIZE (32*1024)
  55. #endif /* pt-machine.h */