153 lines
2.9 KiB
ArmAsm
153 lines
2.9 KiB
ArmAsm
/*
|
|
* 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 "../vmx_asm.h"
|
|
|
|
# Should be safe from C, only touches r4, r5 and v0,v1,v2
|
|
FUNC_START(check_vmx)
|
|
PUSH_BASIC_STACK(32)
|
|
mr r4,r3
|
|
li r3,1 # assume a bad result
|
|
li r5,0
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v20
|
|
vmr v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v21
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v22
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v23
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v24
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v25
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v26
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v27
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v28
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v29
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v30
|
|
vand v2,v2,v1
|
|
|
|
addi r5,r5,16
|
|
lvx v0,r5,r4
|
|
vcmpequd. v1,v0,v31
|
|
vand v2,v2,v1
|
|
|
|
li r5,STACK_FRAME_LOCAL(0,0)
|
|
stvx v2,r5,sp
|
|
ldx r0,r5,sp
|
|
cmpdi r0,0xffffffffffffffff
|
|
bne 1f
|
|
li r3,0
|
|
1: POP_BASIC_STACK(32)
|
|
blr
|
|
FUNC_END(check_vmx)
|
|
|
|
# Safe from C
|
|
FUNC_START(test_vmx)
|
|
# r3 holds pointer to where to put the result of fork
|
|
# r4 holds pointer to the pid
|
|
# v20-v31 are non-volatile
|
|
PUSH_BASIC_STACK(512)
|
|
std r3,STACK_FRAME_PARAM(0)(sp) # Address of varray
|
|
std r4,STACK_FRAME_PARAM(1)(sp) # address of pid
|
|
PUSH_VMX(STACK_FRAME_LOCAL(2,0),r4)
|
|
|
|
bl load_vmx
|
|
nop
|
|
|
|
li r0,__NR_fork
|
|
sc
|
|
# Pass the result of fork back to the caller
|
|
ld r9,STACK_FRAME_PARAM(1)(sp)
|
|
std r3,0(r9)
|
|
|
|
ld r3,STACK_FRAME_PARAM(0)(sp)
|
|
bl check_vmx
|
|
nop
|
|
|
|
POP_VMX(STACK_FRAME_LOCAL(2,0),r4)
|
|
POP_BASIC_STACK(512)
|
|
blr
|
|
FUNC_END(test_vmx)
|
|
|
|
# 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_vmx)
|
|
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
|
|
# VMX need to write to 16 byte aligned addresses, skip STACK_FRAME_LOCAL(3,0)
|
|
PUSH_VMX(STACK_FRAME_LOCAL(4,0),r4)
|
|
|
|
bl load_vmx
|
|
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_vmx
|
|
nop
|
|
cmpdi r3,0
|
|
bne 3f
|
|
ld r4,STACK_FRAME_PARAM(2)(sp)
|
|
ld r5,0(r4)
|
|
cmpwi r5,0
|
|
bne 2b
|
|
|
|
3: POP_VMX(STACK_FRAME_LOCAL(4,0),r4)
|
|
POP_BASIC_STACK(512)
|
|
blr
|
|
FUNC_END(preempt_vmx)
|