linux/arch/x86/include/asm/acpi.h

#ifndef _ASM_X86_ACPI_H
#define _ASM_X86_ACPI_H

/*
 *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <acpi/pdc_intel.h>

#include <asm/numa.h>
#include <asm/fixmap.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/mpspec.h>
#include <asm/realmode.h>

#ifdef CONFIG_ACPI_APEI
# include <asm/pgtable_types.h>
#endif

#ifdef CONFIG_ACPI
extern int acpi_lapic;
extern int acpi_ioapic;
extern int acpi_noirq;
extern int acpi_strict;
extern int acpi_disabled;
extern int acpi_pci_disabled;
extern int acpi_skip_timer_override;
extern int acpi_use_timer_override;
extern int acpi_fix_pin2_polarity;
extern int acpi_disable_cmcff;

extern u8 acpi_sci_flags;
extern int acpi_sci_override_gsi;
void acpi_pic_sci_set_trigger(unsigned int, u16);

extern int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
				  int trigger, int polarity);
extern void (*__acpi_unregister_gsi)(u32 gsi);

static inline void disable_acpi(void)
{
	acpi_disabled = 1;
	acpi_pci_disabled = 1;
	acpi_noirq = 1;
}

extern int acpi_gsi_to_irq(u32 gsi, unsigned int *irq);

static inline void acpi_noirq_set(void) { acpi_noirq = 1; }
static inline void acpi_disable_pci(void)
{
	acpi_pci_disabled = 1;
	acpi_noirq_set();
}

/* Low-level suspend routine. */
extern int (*acpi_suspend_lowlevel)(void);

/* Physical address to resume after wakeup */
#define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start))

/*
 * Check if the CPU can handle C2 and deeper
 */
static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
{
	/*
	 * Early models (<=5) of AMD Opterons are not supposed to go into
	 * C2 state.
	 *
	 * Steppings 0x0A and later are good
	 */
	if (boot_cpu_data.x86 == 0x0F &&
	    boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
	    boot_cpu_data.x86_model <= 0x05 &&
	    boot_cpu_data.x86_mask < 0x0A)
		return 1;
	else if (amd_e400_c1e_detected)
		return 1;
	else
		return max_cstate;
}

static inline bool arch_has_acpi_pdc(void)
{
	struct cpuinfo_x86 *c = &cpu_data(0);
	return (c->x86_vendor == X86_VENDOR_INTEL ||
		c->x86_vendor == X86_VENDOR_CENTAUR);
}

static inline void arch_acpi_set_pdc_bits(u32 *buf)
{
	struct cpuinfo_x86 *c = &cpu_data(0);

	buf[2] |= ACPI_PDC_C_CAPABILITY_SMP;

	if (cpu_has(c, X86_FEATURE_EST))
		buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;

	if (cpu_has(c, X86_FEATURE_ACPI))
		buf[2] |= ACPI_PDC_T_FFH;

	/*
	 * If mwait/monitor is unsupported, C2/C3_FFH will be disabled
	 */
	if (!cpu_has(c, X86_FEATURE_MWAIT))
		buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
}

static inline bool acpi_has_cpu_in_madt(void)
{
	return !!acpi_lapic;
}

#else /* !CONFIG_ACPI */

#define acpi_lapic 0
#define acpi_ioapic 0
#define acpi_disable_cmcff 0
static inline void acpi_noirq_set(void) { }
static inline void acpi_disable_pci(void) { }
static inline void disable_acpi(void) { }

#endif /* !CONFIG_ACPI */

#define ARCH_HAS_POWER_INIT	1

#ifdef CONFIG_ACPI_NUMA
extern int acpi_numa;
extern int x86_acpi_numa_init(void);
#endif /* CONFIG_ACPI_NUMA */

#define acpi_unlazy_tlb(x)	leave_mm(x)

#ifdef CONFIG_ACPI_APEI
static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
{
	/*
	 * We currently have no way to look up the EFI memory map
	 * attributes for a region in a consistent way, because the
	 * memmap is discarded after efi_free_boot_services(). So if
	 * you call efi_mem_attributes() during boot and at runtime,
	 * you could theoretically see different attributes.
	 *
	 * Since we are yet to see any x86 platforms that require
	 * anything other than PAGE_KERNEL (some arm64 platforms
	 * require the equivalent of PAGE_KERNEL_NOCACHE), return that
	 * until we know differently.
	 */
	 return PAGE_KERNEL;
}
#endif

#endif /* _ASM_X86_ACPI_H */