2874c5fd28
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>
58 lines
1.3 KiB
ArmAsm
58 lines
1.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2015, Cyril Bur, IBM Corp.
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*/
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#include "basic_asm.h"
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#include "vsx_asm.h"
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#long check_vsx(vector int *r3);
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#This function wraps storeing VSX regs to the end of an array and a
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#call to a comparison function in C which boils down to a memcmp()
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FUNC_START(check_vsx)
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PUSH_BASIC_STACK(32)
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std r3,STACK_FRAME_PARAM(0)(sp)
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addi r3, r3, 16 * 12 #Second half of array
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bl store_vsx
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ld r3,STACK_FRAME_PARAM(0)(sp)
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bl vsx_memcmp
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POP_BASIC_STACK(32)
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blr
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FUNC_END(check_vsx)
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# int preempt_vmx(vector int *varray, int *threads_starting,
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# int *running);
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# On starting will (atomically) decrement threads_starting as a signal
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# that the VMX have been loaded with varray. Will proceed to check the
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# validity of the VMX registers while running is not zero.
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FUNC_START(preempt_vsx)
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PUSH_BASIC_STACK(512)
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std r3,STACK_FRAME_PARAM(0)(sp) # vector int *varray
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std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting
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std r5,STACK_FRAME_PARAM(2)(sp) # int *running
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bl load_vsx
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nop
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sync
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# Atomic DEC
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ld r3,STACK_FRAME_PARAM(1)(sp)
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1: lwarx r4,0,r3
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addi r4,r4,-1
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stwcx. r4,0,r3
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bne- 1b
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2: ld r3,STACK_FRAME_PARAM(0)(sp)
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bl check_vsx
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nop
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cmpdi r3,0
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bne 3f
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ld r4,STACK_FRAME_PARAM(2)(sp)
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ld r5,0(r4)
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cmpwi r5,0
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bne 2b
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3: POP_BASIC_STACK(512)
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blr
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FUNC_END(preempt_vsx)
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