62 lines
1.5 KiB
ArmAsm
62 lines
1.5 KiB
ArmAsm
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/*
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* Copyright 2015, Cyril Bur, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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