| Anshuman Khandual | 7376093 | 2013-04-22 19:42:41 +0000 | [diff] [blame^] | 1 | /* |
| 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 |
| 33 | 1: 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 | |
| 43 | bhrb_table: |
| 44 | MFBHRB_TABLE32(0) |