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Anshuman Khandual73760932013-04-22 19:42:41 +00001/*
2 * Basic assembly code to read BHRB entries
3 *
4 * Copyright 2013 Anshuman Khandual, IBM Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11#include <asm/ppc_asm.h>
12#include <asm/ppc-opcode.h>
13
14 .text
15
16.balign 8
17
18/* r3 = n (where n = [0-31])
19 * The maximum number of BHRB entries supported with PPC_MFBHRBE instruction
20 * is 1024. We have limited number of table entries here as POWER8 implements
21 * 32 BHRB entries.
22 */
23
24/* .global read_bhrb */
25_GLOBAL(read_bhrb)
26 cmpldi r3,31
27 bgt 1f
28 ld r4,bhrb_table@got(r2)
29 sldi r3,r3,3
30 add r3,r4,r3
31 mtctr r3
32 bctr
331: li r3,0
34 blr
35
36#define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr
37#define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1)
38#define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2)
39#define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4)
40#define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8)
41#define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16)
42
43bhrb_table:
44 MFBHRB_TABLE32(0)