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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simatic-ipc.h (1948B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Siemens SIMATIC IPC drivers
      4 *
      5 * Copyright (c) Siemens AG, 2018-2021
      6 *
      7 * Authors:
      8 *  Henning Schild <henning.schild@siemens.com>
      9 *  Gerd Haeussler <gerd.haeussler.ext@siemens.com>
     10 */
     11
     12#ifndef __PLATFORM_DATA_X86_SIMATIC_IPC_H
     13#define __PLATFORM_DATA_X86_SIMATIC_IPC_H
     14
     15#include <linux/dmi.h>
     16#include <linux/platform_data/x86/simatic-ipc-base.h>
     17
     18#define SIMATIC_IPC_DMI_ENTRY_OEM	129
     19/* binary type */
     20#define SIMATIC_IPC_DMI_TYPE		0xff
     21#define SIMATIC_IPC_DMI_GROUP		0x05
     22#define SIMATIC_IPC_DMI_ENTRY		0x02
     23#define SIMATIC_IPC_DMI_TID		0x02
     24
     25enum simatic_ipc_station_ids {
     26	SIMATIC_IPC_INVALID_STATION_ID = 0,
     27	SIMATIC_IPC_IPC227D = 0x00000501,
     28	SIMATIC_IPC_IPC427D = 0x00000701,
     29	SIMATIC_IPC_IPC227E = 0x00000901,
     30	SIMATIC_IPC_IPC277E = 0x00000902,
     31	SIMATIC_IPC_IPC427E = 0x00000A01,
     32	SIMATIC_IPC_IPC477E = 0x00000A02,
     33	SIMATIC_IPC_IPC127E = 0x00000D01,
     34};
     35
     36static inline u32 simatic_ipc_get_station_id(u8 *data, int max_len)
     37{
     38	struct {
     39		u8	type;		/* type (0xff = binary) */
     40		u8	len;		/* len of data entry */
     41		u8	group;
     42		u8	entry;
     43		u8	tid;
     44		__le32	station_id;	/* station id (LE) */
     45	} __packed * data_entry = (void *)data + sizeof(struct dmi_header);
     46
     47	while ((u8 *)data_entry < data + max_len) {
     48		if (data_entry->type == SIMATIC_IPC_DMI_TYPE &&
     49		    data_entry->len == sizeof(*data_entry) &&
     50		    data_entry->group == SIMATIC_IPC_DMI_GROUP &&
     51		    data_entry->entry == SIMATIC_IPC_DMI_ENTRY &&
     52		    data_entry->tid == SIMATIC_IPC_DMI_TID) {
     53			return le32_to_cpu(data_entry->station_id);
     54		}
     55		data_entry = (void *)((u8 *)(data_entry) + data_entry->len);
     56	}
     57
     58	return SIMATIC_IPC_INVALID_STATION_ID;
     59}
     60
     61static inline void
     62simatic_ipc_find_dmi_entry_helper(const struct dmi_header *dh, void *_data)
     63{
     64	u32 *id = _data;
     65
     66	if (dh->type != SIMATIC_IPC_DMI_ENTRY_OEM)
     67		return;
     68
     69	*id = simatic_ipc_get_station_id((u8 *)dh, dh->length);
     70}
     71
     72#endif /* __PLATFORM_DATA_X86_SIMATIC_IPC_H */