| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Basic assembly code to read BHRB entries |
| * |
| * Copyright 2013 Anshuman Khandual, IBM Corporation. |
| */ |
| #include <asm/ppc_asm.h> |
| #include <asm/ppc-opcode.h> |
| |
| .text |
| |
| .balign 8 |
| |
| /* r3 = n (where n = [0-31]) |
| * The maximum number of BHRB entries supported with PPC_MFBHRBE instruction |
| * is 1024. We have limited number of table entries here as POWER8 implements |
| * 32 BHRB entries. |
| */ |
| |
| /* .global read_bhrb */ |
| _GLOBAL(read_bhrb) |
| cmpldi r3,31 |
| bgt 1f |
| ld r4,bhrb_table@got(r2) |
| sldi r3,r3,3 |
| add r3,r4,r3 |
| mtctr r3 |
| bctr |
| 1: li r3,0 |
| blr |
| |
| #define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr |
| #define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1) |
| #define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2) |
| #define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4) |
| #define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8) |
| #define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16) |
| |
| bhrb_table: |
| MFBHRB_TABLE32(0) |
