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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 "fpu_asm.h"
- FUNC_START(check_fpu)
- mr r4,r3
- li r3,1 # assume a bad result
- lfd f0,0(r4)
- fcmpu cr1,f0,f14
- bne cr1,1f
- lfd f0,8(r4)
- fcmpu cr1,f0,f15
- bne cr1,1f
- lfd f0,16(r4)
- fcmpu cr1,f0,f16
- bne cr1,1f
- lfd f0,24(r4)
- fcmpu cr1,f0,f17
- bne cr1,1f
- lfd f0,32(r4)
- fcmpu cr1,f0,f18
- bne cr1,1f
- lfd f0,40(r4)
- fcmpu cr1,f0,f19
- bne cr1,1f
- lfd f0,48(r4)
- fcmpu cr1,f0,f20
- bne cr1,1f
- lfd f0,56(r4)
- fcmpu cr1,f0,f21
- bne cr1,1f
- lfd f0,64(r4)
- fcmpu cr1,f0,f22
- bne cr1,1f
- lfd f0,72(r4)
- fcmpu cr1,f0,f23
- bne cr1,1f
- lfd f0,80(r4)
- fcmpu cr1,f0,f24
- bne cr1,1f
- lfd f0,88(r4)
- fcmpu cr1,f0,f25
- bne cr1,1f
- lfd f0,96(r4)
- fcmpu cr1,f0,f26
- bne cr1,1f
- lfd f0,104(r4)
- fcmpu cr1,f0,f27
- bne cr1,1f
- lfd f0,112(r4)
- fcmpu cr1,f0,f28
- bne cr1,1f
- lfd f0,120(r4)
- fcmpu cr1,f0,f29
- bne cr1,1f
- lfd f0,128(r4)
- fcmpu cr1,f0,f30
- bne cr1,1f
- lfd f0,136(r4)
- fcmpu cr1,f0,f31
- bne cr1,1f
- li r3,0 # Success!!!
- 1: blr
- FUNC_START(test_fpu)
- # r3 holds pointer to where to put the result of fork
- # r4 holds pointer to the pid
- # f14-f31 are non volatiles
- PUSH_BASIC_STACK(256)
- PUSH_FPU(256)
- std r3,STACK_FRAME_PARAM(0)(sp) # Address of darray
- std r4,STACK_FRAME_PARAM(1)(sp) # Address of pid
- bl load_fpu
- nop
- li r0,__NR_fork
- sc
- # pass the result of the fork to the caller
- ld r9,STACK_FRAME_PARAM(1)(sp)
- std r3,0(r9)
- ld r3,STACK_FRAME_PARAM(0)(sp)
- bl check_fpu
- nop
- POP_FPU(256)
- POP_BASIC_STACK(256)
- blr
- FUNC_END(test_fpu)
- # int preempt_fpu(double *darray, int *threads_running, int *running)
- # On starting will (atomically) decrement not_ready as a signal that the FPU
- # has been loaded with darray. Will proceed to check the validity of the FPU
- # registers while running is not zero.
- FUNC_START(preempt_fpu)
- PUSH_BASIC_STACK(256)
- PUSH_FPU(256)
- std r3,STACK_FRAME_PARAM(0)(sp) # double *darray
- std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting
- std r5,STACK_FRAME_PARAM(2)(sp) # int *running
- bl load_fpu
- 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_fpu
- nop
- cmpdi r3,0
- bne 3f
- ld r4,STACK_FRAME_PARAM(2)(sp)
- ld r5,0(r4)
- cmpwi r5,0
- bne 2b
- 3: POP_FPU(256)
- POP_BASIC_STACK(256)
- blr
- FUNC_END(preempt_fpu)
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