linux/arch/powerpc/perf/bhrb.S
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

41 lines
986 B
ArmAsm

/* 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)