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/* $NetBSD: linux_acpi.c,v 1.2 2022/02/28 17:15:30 riastradh Exp $ */
/*-
* Copyright (c) 2022 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_acpi.c,v 1.2 2022/02/28 17:15:30 riastradh Exp $");
#include <dev/acpi/acpireg.h>
#include <linux/acpi.h>
#define _COMPONENT ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("linux_acpi")
union acpi_object *
acpi_evaluate_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 func,
union acpi_object *argv4)
{
ACPI_OBJECT_LIST arg;
ACPI_OBJECT params[4];
ACPI_BUFFER buf;
ACPI_STATUS rv;
if (handle == NULL)
handle = ACPI_ROOT_OBJECT;
arg.Count = 4;
arg.Pointer = params;
params[0].Type = ACPI_TYPE_BUFFER;
params[0].Buffer.Length = 16;
params[0].Buffer.Pointer = (char *)__UNCONST(uuid);
params[1].Type = ACPI_TYPE_INTEGER;
params[1].Integer.Value = rev;
params[2].Type = ACPI_TYPE_INTEGER;
params[2].Integer.Value = func;
if (argv4 != NULL) {
params[3] = *argv4;
} else {
params[3].Type = ACPI_TYPE_PACKAGE;
params[3].Package.Count = 0;
params[3].Package.Elements = NULL;
}
buf.Pointer = NULL;
buf.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
rv = AcpiEvaluateObject(handle, "_DSM", &arg, &buf);
if (ACPI_SUCCESS(rv))
return (ACPI_OBJECT *)buf.Pointer;
return NULL;
}
union acpi_object *
acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *uuid, u64 rev,
u64 func, union acpi_object *argv4, acpi_object_type type)
{
union acpi_object *obj;
obj = acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
if (obj != NULL && obj->Type != type) {
ACPI_FREE(obj);
obj = NULL;
}
return obj;
}
#define ACPI_INIT_DSM_ARGV4(cnt, eles) \
{ \
.Package.Type = ACPI_TYPE_PACKAGE, \
.Package.Count = (cnt), \
.Package.Elements = (eles) \
}
bool
acpi_check_dsm(acpi_handle handle, const guid_t *uuid, u64 rev, u64 funcs)
{
ACPI_OBJECT *obj;
uint64_t mask = 0;
int i;
if (funcs == 0)
return false;
obj = acpi_evaluate_dsm(handle, uuid, rev, 0, NULL);
if (obj == NULL)
return false;
if (obj->Type == ACPI_TYPE_INTEGER)
mask = obj->Integer.Value;
else if (obj->Type == ACPI_TYPE_BUFFER)
for (i = 0; i < obj->Buffer.Length && i < 8; i++)
mask |= (uint64_t)obj->Buffer.Pointer[i] << (i * 8);
ACPI_FREE(obj);
if ((mask & 0x1) == 0x1 && (mask & funcs) == funcs)
return true;
return false;
}
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