powerpc/perf/bhrb.S

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Basic assembly code to read BHRB entries
0004  *
0005  * Copyright 2013 Anshuman Khandual, IBM Corporation.
0006  */
0007 #include <asm/ppc_asm.h>
0008 #include <asm/ppc-opcode.h>
0009
0010     .text
0011
0012 .balign 8
0013
0014 /* r3 = n  (where n = [0-31])
0015  * The maximum number of BHRB entries supported with PPC_MFBHRBE instruction
0016  * is 1024. We have limited number of table entries here as POWER8 implements
0017  * 32 BHRB entries.
0018  */
0019
0020 /* .global read_bhrb */
0021 _GLOBAL(read_bhrb)
0022     cmpldi  r3,31
0023     bgt 1f
0024     ld  r4,bhrb_table@got(r2)
0025     sldi    r3,r3,3
0026     add r3,r4,r3
0027     mtctr   r3
0028     bctr
0029 1:  li  r3,0
0030     blr
0031
0032 #define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr
0033 #define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1)
0034 #define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2)
0035 #define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4)
0036 #define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8)
0037 #define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16)
0038
0039 bhrb_table:
0040     MFBHRB_TABLE32(0)