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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mxm-wmi.c (1987B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * MXM WMI driver
      4 *
      5 * Copyright(C) 2010 Red Hat.
      6 */
      7#include <linux/kernel.h>
      8#include <linux/module.h>
      9#include <linux/init.h>
     10#include <linux/mxm-wmi.h>
     11#include <linux/acpi.h>
     12
     13MODULE_AUTHOR("Dave Airlie");
     14MODULE_DESCRIPTION("MXM WMI Driver");
     15MODULE_LICENSE("GPL");
     16
     17#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
     18
     19MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
     20
     21#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
     22#define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
     23
     24struct mxds_args {
     25	u32 func;
     26	u32 args;
     27	u32 xarg;
     28};
     29
     30int mxm_wmi_call_mxds(int adapter)
     31{
     32	struct mxds_args args = {
     33		.func = MXM_WMMX_FUNC_MXDS,
     34		.args = 0,
     35		.xarg = 1,
     36	};
     37	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
     38	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
     39	acpi_status status;
     40
     41	printk("calling mux switch %d\n", adapter);
     42
     43	status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
     44				     &output);
     45
     46	if (ACPI_FAILURE(status))
     47		return status;
     48
     49	printk("mux switched %d\n", status);
     50	return 0;
     51			    
     52}
     53EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
     54
     55int mxm_wmi_call_mxmx(int adapter)
     56{
     57	struct mxds_args args = {
     58		.func = MXM_WMMX_FUNC_MXMX,
     59		.args = 0,
     60		.xarg = 1,
     61	};
     62	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
     63	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
     64	acpi_status status;
     65
     66	printk("calling mux switch %d\n", adapter);
     67
     68	status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
     69				     &output);
     70
     71	if (ACPI_FAILURE(status))
     72		return status;
     73
     74	printk("mux mutex set switched %d\n", status);
     75	return 0;
     76			    
     77}
     78EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
     79
     80bool mxm_wmi_supported(void)
     81{
     82	bool guid_valid;
     83	guid_valid = wmi_has_guid(MXM_WMMX_GUID);
     84	return guid_valid;
     85}
     86EXPORT_SYMBOL_GPL(mxm_wmi_supported);
     87
     88static int __init mxm_wmi_init(void)
     89{
     90	return 0;
     91}
     92
     93static void __exit mxm_wmi_exit(void)
     94{
     95}
     96
     97module_init(mxm_wmi_init);
     98module_exit(mxm_wmi_exit);