cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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acpi.c (2796B)

      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}