1. 根目录:
2. drivers
3. xen
4. acpi.c

/******************************************************************************
 * acpi.c
 * acpi file for domain 0 kernel
 *
 * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
 * Copyright (c) 2011 Yu Ke ke.yu@intel.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <xen/acpi.h>
#include <xen/interface/platform.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>

static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
					    u32 val_a, u32 val_b,
					    bool extended)
{
	unsigned int bits = extended ? 8 : 16;

	struct xen_platform_op op = {
		.cmd = XENPF_enter_acpi_sleep,
		.interface_version = XENPF_INTERFACE_VERSION,
		.u.enter_acpi_sleep = {
			.val_a = (u16)val_a,
			.val_b = (u16)val_b,
			.sleep_state = sleep_state,
			.flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
		},
	};

	if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
		 "Using more than %u bits of sleep control values %#x/%#x!"
		 "Email xen-devel@lists.xen.org - Thank you.\n", \
		 bits, val_a, val_b))
		return -1;

	HYPERVISOR_dom0_op(&op);
	return 1;
}

int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
				     u32 pm1a_cnt, u32 pm1b_cnt)
{
	return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
						pm1b_cnt, false);
}

int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
				     u32 val_a, u32 val_b)
{
	return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
						val_b, true);
}