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 Corporation. 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 supported with PPC_MFBHRBE instruction 16 * is 1024. We have limited number of table entries here as POWER8 implements 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 291: li r3,0 30 blr 31 32#define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr 33#define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1) 34#define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2) 35#define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4) 36#define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8) 37#define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16) 38 39bhrb_table: 40 MFBHRB_TABLE32(0) 41