bhrb.S 991 B

12345678910111213141516171819202122232425262728293031323334353637383940
  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
  2. /*
  3. * Basic assembly code to read BHRB entries
  4. *
  5. * Copyright 2013 Anshuman Khandual, IBM Corporation.
  6. */
  7. #include <asm/ppc_asm.h>
  8. #include <asm/ppc-opcode.h>
  9. .text
  10. .balign 8
  11. /* r3 = n (where n = [0-31])
  12. * The maximum number of BHRB entries supported with PPC_MFBHRBE instruction
  13. * is 1024. We have limited number of table entries here as POWER8 implements
  14. * 32 BHRB entries.
  15. */
  16. /* .global read_bhrb */
  17. _GLOBAL(read_bhrb)
  18. cmpldi r3,31
  19. bgt 1f
  20. LOAD_REG_ADDR(r4, bhrb_table)
  21. sldi r3,r3,3
  22. add r3,r4,r3
  23. mtctr r3
  24. bctr
  25. 1: li r3,0
  26. blr
  27. #define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr
  28. #define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1)
  29. #define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2)
  30. #define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4)
  31. #define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8)
  32. #define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16)
  33. bhrb_table:
  34. MFBHRB_TABLE32(0)