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135 lines
2.5 KiB
135 lines
2.5 KiB
/*
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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 "fpu_asm.h"
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FUNC_START(check_fpu)
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mr r4,r3
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li r3,1 # assume a bad result
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lfd f0,0(r4)
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fcmpu cr1,f0,f14
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bne cr1,1f
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lfd f0,8(r4)
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fcmpu cr1,f0,f15
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bne cr1,1f
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lfd f0,16(r4)
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fcmpu cr1,f0,f16
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bne cr1,1f
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lfd f0,24(r4)
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fcmpu cr1,f0,f17
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bne cr1,1f
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lfd f0,32(r4)
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fcmpu cr1,f0,f18
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bne cr1,1f
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lfd f0,40(r4)
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fcmpu cr1,f0,f19
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bne cr1,1f
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lfd f0,48(r4)
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fcmpu cr1,f0,f20
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bne cr1,1f
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lfd f0,56(r4)
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fcmpu cr1,f0,f21
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bne cr1,1f
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lfd f0,64(r4)
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fcmpu cr1,f0,f22
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bne cr1,1f
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lfd f0,72(r4)
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fcmpu cr1,f0,f23
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bne cr1,1f
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lfd f0,80(r4)
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fcmpu cr1,f0,f24
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bne cr1,1f
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lfd f0,88(r4)
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fcmpu cr1,f0,f25
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bne cr1,1f
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lfd f0,96(r4)
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fcmpu cr1,f0,f26
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bne cr1,1f
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lfd f0,104(r4)
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fcmpu cr1,f0,f27
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bne cr1,1f
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lfd f0,112(r4)
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fcmpu cr1,f0,f28
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bne cr1,1f
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lfd f0,120(r4)
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fcmpu cr1,f0,f29
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bne cr1,1f
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lfd f0,128(r4)
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fcmpu cr1,f0,f30
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bne cr1,1f
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lfd f0,136(r4)
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fcmpu cr1,f0,f31
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bne cr1,1f
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li r3,0 # Success!!!
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1: blr
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FUNC_START(test_fpu)
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# r3 holds pointer to where to put the result of fork
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# r4 holds pointer to the pid
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# f14-f31 are non volatiles
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PUSH_BASIC_STACK(256)
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PUSH_FPU(256)
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std r3,STACK_FRAME_PARAM(0)(sp) # Address of darray
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std r4,STACK_FRAME_PARAM(1)(sp) # Address of pid
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bl load_fpu
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nop
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li r0,__NR_fork
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sc
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# pass the result of the fork to the caller
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ld r9,STACK_FRAME_PARAM(1)(sp)
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std r3,0(r9)
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ld r3,STACK_FRAME_PARAM(0)(sp)
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bl check_fpu
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nop
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POP_FPU(256)
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POP_BASIC_STACK(256)
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blr
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FUNC_END(test_fpu)
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# int preempt_fpu(double *darray, int *threads_running, int *running)
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# On starting will (atomically) decrement not_ready as a signal that the FPU
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# has been loaded with darray. Will proceed to check the validity of the FPU
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# registers while running is not zero.
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FUNC_START(preempt_fpu)
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PUSH_BASIC_STACK(256)
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PUSH_FPU(256)
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std r3,STACK_FRAME_PARAM(0)(sp) # double *darray
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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_fpu
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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_fpu
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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_FPU(256)
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POP_BASIC_STACK(256)
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blr
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FUNC_END(preempt_fpu)
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