| /* |
| * 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) |
