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pt-machine.h

pt-machine.h 2.1 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2016 Andes Technology, Inc.
    3. 

  3.  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
    4. 

  4.  */
    5. 

  5. 

  6. /* Machine-dependent pthreads configuration and inline functions.
    7. 

  7.    Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
    8. 

  8.    Contributed by Philip Blundell <philb@gnu.org>.
    9. 

  9. 

  10.    The GNU C Library is free software; you can redistribute it and/or
    11. 

  11.    modify it under the terms of the GNU Lesser General Public License as
    12. 

  12.    published by the Free Software Foundation; either version 2.1 of the
    13. 

  13.    License, or (at your option) any later version.
    14. 

  14. 

  15.    The GNU C Library is distributed in the hope that it will be useful,
    16. 

  16.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    17. 

  17.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    18. 

  18.    Lesser General Public License for more details.
    19. 

  19. 

  20.    You should have received a copy of the GNU Lesser General Public
    21. 

  21.    License along with the GNU C Library; see the file COPYING.LIB.  If not,
    22. 

  22.    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    23. 

  23.    Boston, MA 02111-1307, USA.  */
    24. 

  24. 

  25. #ifndef _PT_MACHINE_H
    26. 

  26. #define _PT_MACHINE_H   1
    27. 

  27. 

  28. #include <features.h>
    29. 

  29. 

  30. #ifndef PT_EI
    31. 

  31. # define PT_EI __extern_always_inline
    32. 

  32. #endif
    33. 

  33. 

  34. extern long int testandset (int *spinlock);
    35. 

  35. extern int __compare_and_swap (long int *p, long int oldval, long int newval);
    36. 

  36. 

  37. /* Spinlock implementation; required.  */
    38. 

  38. PT_EI long int
    39. 

  39. testandset (int *spinlock)
    40. 

  40. {
    41. 

  41. 	unsigned int		val;
    42. 

  42. 	unsigned int		temp;
    43. 

  43. 	unsigned int		offset = 0;
    44. 

  44. 

  45. 	__asm__ __volatile__ (
    46. 

  46. 		"1:\n\t"
    47. 

  47. 		"llw	%[val],	[%[spinlock] + %[offset] << 0]\n\t"
    48. 

  48. 		"move	%[temp], #0x1\n\t"
    49. 

  49. 		"beq	%[val], %[temp], 2f\n\t"
    50. 

  50. 		"scw	%[temp], [%[spinlock] + %[offset] << 0]\n\t"
    51. 

  51. 		"beqz   %[temp], 1b\n\t"
    52. 

  52. 		"2:\n\t"
    53. 

  53. 		: [val] "=&r" (val), [temp] "=&r" (temp)
    54. 

  54. 		: [spinlock] "r" (spinlock), [offset] "r" (offset)
    55. 

  55. 		: "memory" ) ;
    56. 

  56. 		
    57. 

  57. 	return val ;
    58. 

  58. }
    59. 

  59. 

  60. 

  61. /* Get some notion of the current stack.  Need not be exactly the top
    62. 

  62.    of the stack, just something somewhere in the current frame.  */
    63. 

  63. #define CURRENT_STACK_FRAME  stack_pointer
    64. 

  64. register char * stack_pointer __asm__ ("$sp");
    65. 

  65. 

  66. #endif /* pt-machine.h */
    67.