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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aspeed-p2a-ctrl.h (1921B)

      1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
      2/*
      3 * Copyright 2019 Google Inc
      4 *
      5 * This program is free software; you can redistribute it and/or
      6 * modify it under the terms of the GNU General Public License
      7 * as published by the Free Software Foundation; either version
      8 * 2 of the License, or (at your option) any later version.
      9 *
     10 * Provides a simple driver to control the ASPEED P2A interface which allows
     11 * the host to read and write to various regions of the BMC's memory.
     12 */
     13
     14#ifndef _UAPI_LINUX_ASPEED_P2A_CTRL_H
     15#define _UAPI_LINUX_ASPEED_P2A_CTRL_H
     16
     17#include <linux/ioctl.h>
     18#include <linux/types.h>
     19
     20#define ASPEED_P2A_CTRL_READ_ONLY 0
     21#define ASPEED_P2A_CTRL_READWRITE 1
     22
     23/*
     24 * This driver provides a mechanism for enabling or disabling the read-write
     25 * property of specific windows into the ASPEED BMC's memory.
     26 *
     27 * A user can map a region of the BMC's memory as read-only or read-write, with
     28 * the caveat that once any region is mapped, all regions are unlocked for
     29 * reading.
     30 */
     31
     32/*
     33 * Unlock a region of BMC physical memory for access from the host.
     34 *
     35 * Also used to read back the optional memory-region configuration for the
     36 * driver.
     37 */
     38struct aspeed_p2a_ctrl_mapping {
     39	__u64 addr;
     40	__u32 length;
     41	__u32 flags;
     42};
     43
     44#define __ASPEED_P2A_CTRL_IOCTL_MAGIC 0xb3
     45
     46/*
     47 * This IOCTL is meant to configure a region or regions of memory given a
     48 * starting address and length to be readable by the host, or
     49 * readable-writeable.
     50 */
     51#define ASPEED_P2A_CTRL_IOCTL_SET_WINDOW _IOW(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \
     52		0x00, struct aspeed_p2a_ctrl_mapping)
     53
     54/*
     55 * This IOCTL is meant to read back to the user the base address and length of
     56 * the memory-region specified to the driver for use with mmap.
     57 */
     58#define ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG \
     59	_IOWR(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \
     60		0x01, struct aspeed_p2a_ctrl_mapping)
     61
     62#endif /* _UAPI_LINUX_ASPEED_P2A_CTRL_H */