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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2019 Joyent, Inc.
*/
#include <sys/asm_linkage.h>
#include <sys/asm_misc.h>
/*
* Implementation as specific by ACPI 3.0 specification
* section 5.2.10.1
*
* Global Lock Structure within the FACS
*
* |-----------------------------------------------------------------------|
* | Field | Bit Length | Bit Offset | Description |
* |---------|------------|------------|-----------------------------------|
* | Pending | 1 | 0 | Non-zero indicates that a request |
* | | | | for ownership of the global lock |
* | | | | is pending. |
* |---------|------------|------------|-----------------------------------|
* | Owned | 1 | 1 | Non-zero indicates that the Global|
* | | | | lock is owned. |
* |---------|------------|------------|-----------------------------------|
* | Reserved| 30 | 2 | Reserved for future use |
* |---------|------------|------------|-----------------------------------|
*/
/* Offset of GlobalLock element in FACS structure */
#define GlobalLock 0x10
ENTRY(__acpi_acquire_global_lock)
movq $0xff, %rax / error return if FACS is null
orq %rdi, %rdi / %rdi contains pointer to FACS
jz 1f
leaq GlobalLock(%rdi), %rdi / make %rdi point at the lock
0:
movl (%rdi), %eax / get current value of Global Lock
movl %eax, %edx
andl $0xFFFFFFFE, %edx / Clear pending bit
btsl $1, %edx / Check and set owner bit
adcl $0, %edx / If owned, set pending bit
lock
cmpxchgl %edx, (%rdi) / Attempt to set new value
jnz 0b / If not set, try again
cmpb $3, %dl / Was it acquired or marked pending?
sbbq %rax, %rax / acquired = -1, pending = 0
1:
ret
SET_SIZE(__acpi_acquire_global_lock)
ENTRY(__acpi_release_global_lock)
xorq %rax, %rax / error return if FACS is null
orq %rdi, %rdi / %rdi contains pointer to FACS
jz 1f
leaq GlobalLock(%rdi), %rdi / make %rdi point at the lock
0:
movl (%rdi), %eax
movl %eax, %edx
andl $0xFFFFFFFC, %edx
lock
cmpxchgl %edx, (%rdi)
jnz 0b
andq $1, %rax
1:
ret
SET_SIZE(__acpi_release_global_lock)
/*
* execute WBINVD instruction
*/
ENTRY(__acpi_wbinvd)
wbinvd
ret
SET_SIZE(__acpi_wbinvd)
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