/* $NetBSD: acpi_pdc.c,v 1.2 2011/06/20 15:39:54 jruoho Exp $ */
/*-
* Copyright (c) 2010, 2011 Jukka Ruohonen <
[email protected]>
* 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 AUTHOR 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 AUTHOR 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: acpi_pdc.c,v 1.2 2011/06/20 15:39:54 jruoho Exp $");
#include <sys/param.h>
#include <x86/cpu.h>
#include <x86/cputypes.h>
#include <x86/cpuvar.h>
#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpi_cpu.h>
#include <machine/acpi_machdep.h>
#define _COMPONENT ACPI_BUS_COMPONENT
ACPI_MODULE_NAME ("acpi_pdc")
static uint32_t flags = 0;
static ACPI_STATUS acpi_md_pdc_walk(ACPI_HANDLE, uint32_t,void *,void **);
static void acpi_md_pdc_set(ACPI_HANDLE, uint32_t);
uint32_t
acpi_md_pdc(void)
{
struct cpu_info *ci = curcpu();
uint32_t regs[4];
if (flags != 0)
return flags;
if (cpu_vendor != CPUVENDOR_IDT &&
cpu_vendor != CPUVENDOR_INTEL)
return 0;
/*
* Basic SMP C-states (required for e.g. _CST).
*/
flags |= ACPICPU_PDC_C_C1PT | ACPICPU_PDC_C_C2C3;
/*
* Claim to support dependency coordination.
*/
flags |= ACPICPU_PDC_P_SW | ACPICPU_PDC_C_SW | ACPICPU_PDC_T_SW;
/*
* If MONITOR/MWAIT is available, announce
* support for native instructions in all C-states.
*/
if ((ci->ci_feat_val[1] & CPUID2_MONITOR) != 0)
flags |= ACPICPU_PDC_C_C1_FFH | ACPICPU_PDC_C_C2C3_FFH;
/*
* Set native P- and T-states, if available.
*/
if ((ci->ci_feat_val[1] & CPUID2_EST) != 0)
flags |= ACPICPU_PDC_P_FFH;
if ((ci->ci_feat_val[0] & CPUID_ACPI) != 0)
flags |= ACPICPU_PDC_T_FFH;
/*
* Declare support for APERF and MPERF.
*/
if (cpuid_level >= 0x06) {
x86_cpuid(0x00000006, regs);
if ((regs[2] & CPUID_DSPM_HWF) != 0)
flags |= ACPICPU_PDC_P_HWF;
}
/*
* As the _PDC must be evaluated before the internal namespace
* is built, we have no option but to walk with the interpreter.
*/
(void)AcpiWalkNamespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
UINT32_MAX, acpi_md_pdc_walk, NULL, NULL, NULL);
return flags;
}
static ACPI_STATUS
acpi_md_pdc_walk(ACPI_HANDLE hdl, uint32_t level, void *aux, void **sta)
{
struct cpu_info *ci;
ci = acpi_match_cpu_handle(hdl);
if (ci != NULL)
acpi_md_pdc_set(hdl, flags);
return AE_OK;
}
static void
acpi_md_pdc_set(ACPI_HANDLE hdl, uint32_t val)
{
ACPI_OBJECT_LIST arg;
ACPI_OBJECT obj;
uint32_t cap[3];
arg.Count = 1;
arg.Pointer = &obj;
cap[0] = ACPICPU_PDC_REVID;
cap[1] = 1;
cap[2] = val;
obj.Type = ACPI_TYPE_BUFFER;
obj.Buffer.Length = sizeof(cap);
obj.Buffer.Pointer = (void *)cap;
(void)AcpiEvaluateObject(hdl, "_PDC", &arg, NULL);
}
