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 Corpo
6 */
7 #include <asm/ppc_asm.h>
8 #include <asm/ppc-opcode.h>
9
10 .text
11
12 .balign 8
13
14 /* r3 = n (where n = [0-31])
15 * The maximum number of BHRB entries supporte
16 * is 1024. We have limited number of table en
17 * 32 BHRB entries.
18 */
19
20 /* .global read_bhrb */
21 _GLOBAL(read_bhrb)
22 cmpldi r3,31
23 bgt 1f
24 LOAD_REG_ADDR(r4, bhrb_table)
25 sldi r3,r3,3
26 add r3,r4,r3
27 mtctr r3
28 bctr
29 1: li r3,0
30 blr
31
32 #define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); bl
33 #define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFB
34 #define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFB
35 #define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFB
36 #define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MF
37 #define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); M
38
39 bhrb_table:
40 MFBHRB_TABLE32(0)
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