LXR linux/drivers/xen/acpi.c

   1/******************************************************************************
   2 * acpi.c
   3 * acpi file for domain 0 kernel
   4 *
   5 * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
   6 * Copyright (c) 2011 Yu Ke ke.yu@intel.com
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License version 2
  10 * as published by the Free Software Foundation; or, when distributed
  11 * separately from the Linux kernel or incorporated into other
  12 * software packages, subject to the following license:
  13 *
  14 * Permission is hereby granted, free of charge, to any person obtaining a copy
  15 * of this source file (the "Software"), to deal in the Software without
  16 * restriction, including without limitation the rights to use, copy, modify,
  17 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  18 * and to permit persons to whom the Software is furnished to do so, subject to
  19 * the following conditions:
  20 *
  21 * The above copyright notice and this permission notice shall be included in
  22 * all copies or substantial portions of the Software.
  23 *
  24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  30 * IN THE SOFTWARE.
  31 */
  32
  33#include <xen/acpi.h>
  34#include <xen/interface/platform.h>
  35#include <asm/xen/hypercall.h>
  36#include <asm/xen/hypervisor.h>
  37
  38static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
  39                                            u32 val_a, u32 val_b,
  40                                            bool extended)
  41{
  42        unsigned int bits = extended ? 8 : 16;
  43
  44        struct xen_platform_op op = {
  45                .cmd = XENPF_enter_acpi_sleep,
  46                .interface_version = XENPF_INTERFACE_VERSION,
  47                .u.enter_acpi_sleep = {
  48                        .val_a = (u16)val_a,
  49                        .val_b = (u16)val_b,
  50                        .sleep_state = sleep_state,
  51                        .flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
  52                },
  53        };
  54
  55        if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
  56                 "Using more than %u bits of sleep control values %#x/%#x!"
  57                 "Email xen-devel@lists.xen.org - Thank you.\n", \
  58                 bits, val_a, val_b))
  59                return -1;
  60
  61        HYPERVISOR_platform_op(&op);
  62        return 1;
  63}
  64
  65int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
  66                                     u32 pm1a_cnt, u32 pm1b_cnt)
  67{
  68        return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
  69                                                pm1b_cnt, false);
  70}
  71
  72int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
  73                                     u32 val_a, u32 val_b)
  74{
  75        return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
  76                                                val_b, true);
  77}
  78