| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * Basic assembly code to read BHRB entries |
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| 4 | * |
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| 5 | * Copyright 2013 Anshuman Khandual, IBM Corporation. |
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| 6 | */ |
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| 7 | #include <asm/ppc_asm.h> |
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| 8 | #include <asm/ppc-opcode.h> |
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| 9 | |
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| 10 | .text |
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| 11 | |
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| 12 | .balign 8 |
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| 13 | |
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| 14 | /* r3 = n (where n = [0-31]) |
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| 15 | * The maximum number of BHRB entries supported with PPC_MFBHRBE instruction |
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| 16 | * is 1024. We have limited number of table entries here as POWER8 implements |
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| 17 | * 32 BHRB entries. |
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| 18 | */ |
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| 19 | |
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| 20 | /* .global read_bhrb */ |
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| 21 | _GLOBAL(read_bhrb) |
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| 22 | cmpldi r3,31 |
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| 23 | bgt 1f |
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| 24 | LOAD_REG_ADDR(r4, bhrb_table) |
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| 25 | sldi r3,r3,3 |
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| 26 | add r3,r4,r3 |
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| 27 | mtctr r3 |
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| 28 | bctr |
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| 29 | 1: li r3,0 |
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| 30 | blr |
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| 31 | |
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| 32 | #define MFBHRB_TABLE1(n) PPC_MFBHRBE(R3,n); blr |
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| 33 | #define MFBHRB_TABLE2(n) MFBHRB_TABLE1(n); MFBHRB_TABLE1(n+1) |
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| 34 | #define MFBHRB_TABLE4(n) MFBHRB_TABLE2(n); MFBHRB_TABLE2(n+2) |
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| 35 | #define MFBHRB_TABLE8(n) MFBHRB_TABLE4(n); MFBHRB_TABLE4(n+4) |
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| 36 | #define MFBHRB_TABLE16(n) MFBHRB_TABLE8(n); MFBHRB_TABLE8(n+8) |
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| 37 | #define MFBHRB_TABLE32(n) MFBHRB_TABLE16(n); MFBHRB_TABLE16(n+16) |
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| 38 | |
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| 39 | bhrb_table: |
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| 40 | MFBHRB_TABLE32(0) |
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| 41 | |
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