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