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bhrb.S

bhrb.S 991 B
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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
    2. 

  2. /*
    3. 

  3.  * Basic assembly code to read BHRB entries
    4. 

  4.  *
    5. 

  5.  * Copyright 2013 Anshuman Khandual, IBM Corporation.
    6. 

  6.  */
    7. 

  7. #include <asm/ppc_asm.h>
    8. 

  8. #include <asm/ppc-opcode.h>
    9. 

  9. 

  10. 	.text
    11. 

  11. 

  12. .balign 8
    13. 

  13. 

  14. /* r3 = n  (where n = [0-31])
    15. 

  15.  * The maximum number of BHRB entries supported with PPC_MFBHRBE instruction
    16. 

  16.  * is 1024. We have limited number of table entries here as POWER8 implements
    17. 

  17.  * 32 BHRB entries.
    18. 

  18.  */
    19. 

  19. 

  20. /* .global read_bhrb */
    21. 

  21. _GLOBAL(read_bhrb)
    22. 

  22. 	cmpldi	r3,31
    23. 

  23. 	bgt	1f
    24. 

  24. 	LOAD_REG_ADDR(r4, bhrb_table)
    25. 

  25. 	sldi	r3,r3,3
    26. 

  26. 	add	r3,r4,r3
    27. 

  27. 	mtctr	r3
    28. 

  28. 	bctr
    29. 

  29. 1:	li	r3,0
    30. 

  30. 	blr
    31. 

  31. 

  32. #define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr
    33. 

  33. #define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1)
    34. 

  34. #define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2)
    35. 

  35. #define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4)
    36. 

  36. #define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8)
    37. 

  37. #define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16)
    38. 

  38. 

  39. bhrb_table:
    40. 

  40. 	MFBHRB_TABLE32(0)
    41.