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jack1/config/cpu/powerpc/cycles.h

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  1. /*

  2.     Copyright (C) 2001 Paul Davis

  3.     Code derived from various headers from the Linux kernel

  4. 

  5.     This program is free software; you can redistribute it and/or modify

  6.     it under the terms of the GNU General Public License as published by

  7.     the Free Software Foundation; either version 2 of the License, or

  8.     (at your option) any later version.

  9. 

  10.     This program 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

  13.     GNU General Public License for more details.

  14. 

  15.     You should have received a copy of the GNU General Public License

  16.     along with this program; if not, write to the Free Software

  17.     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  18. 

  19.  */

  20. 

  21. #ifndef __jack_cycles_h__

  22. #define __jack_cycles_h__

  23. 

  24. /* PowerPC */

  25. 

  26. #define CPU_FTR_601                     0x00000100

  27. #ifdef __powerpc64__

  28. #define CPU_FTR_CELL_TB_BUG             0x0000800000000000UL

  29. #endif /* __powerpc64__ */

  30. 

  31. typedef unsigned long cycles_t;

  32. 

  33. /* For the "cycle" counter we use the timebase lower half. */

  34. 

  35. extern cycles_t cacheflush_time;

  36. 

  37. static inline cycles_t get_cycles (void)

  38. {

  39. 	cycles_t ret = 0;

  40. 

  41. #ifdef __powerpc64__

  42. #ifdef ENABLE_CELLBE

  43. 	asm volatile (					 \

  44. 		"90:	mftb %0;\n"			\

  45. 		"97:	cmpwi %0,0;\n"			\

  46. 		"	beq- 90b;\n"			\

  47. 		"99:\n"					\

  48. 		".section __ftr_fixup,\"a\"\n"		\

  49. 		".align 3\n"				\

  50. 		"98:\n"					\

  51. 		"	.llong %1\n"			\

  52. 		"	.llong %1\n"			\

  53. 		"	.llong 97b-98b\n"		\

  54. 		"	.llong 99b-98b\n"		\

  55. 		".previous"				\

  56. 		: "=r" (ret) : "i" (CPU_FTR_CELL_TB_BUG));

  57. #else   /* !ENABLE_CELLBE */

  58. 	__asm__ __volatile__ ("mftb %0" : "=r" (ret));

  59. #endif /* !ENABLE_CELLBE */

  60. #else   /* !__powerpc64__ */

  61. 	__asm__ __volatile__ (

  62. 		"98:	mftb %0\n"

  63. 		"99:\n"

  64. 		".section __ftr_fixup,\"a\"\n"

  65. 		"	.long %1\n"

  66. 		"	.long 0\n"

  67. 		"	.long 98b\n"

  68. 		"	.long 99b\n"

  69. 		".previous"

  70. 		: "=r" (ret) : "i" (CPU_FTR_601));

  71. #endif  /* !__powerpc64__ */

  72. 	return ret;

  73. }

  74. 

  75. #endif /* __jack_cycles_h__ */