Current File : //usr/include/linux/aspeed-p2a-ctrl.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* Copyright 2019 Google Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Provides a simple driver to control the ASPEED P2A interface which allows
* the host to read and write to various regions of the BMC's memory.
*/
#ifndef _LINUX_ASPEED_P2A_CTRL_H
#define _LINUX_ASPEED_P2A_CTRL_H
#include <linux/ioctl.h>
#include <linux/types.h>
#define ASPEED_P2A_CTRL_READ_ONLY 0
#define ASPEED_P2A_CTRL_READWRITE 1
/*
* This driver provides a mechanism for enabling or disabling the read-write
* property of specific windows into the ASPEED BMC's memory.
*
* A user can map a region of the BMC's memory as read-only or read-write, with
* the caveat that once any region is mapped, all regions are unlocked for
* reading.
*/
/*
* Unlock a region of BMC physical memory for access from the host.
*
* Also used to read back the optional memory-region configuration for the
* driver.
*/
struct aspeed_p2a_ctrl_mapping {
__u64 addr;
__u32 length;
__u32 flags;
};
#define __ASPEED_P2A_CTRL_IOCTL_MAGIC 0xb3
/*
* This IOCTL is meant to configure a region or regions of memory given a
* starting address and length to be readable by the host, or
* readable-writeable.
*/
#define ASPEED_P2A_CTRL_IOCTL_SET_WINDOW _IOW(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \
0x00, struct aspeed_p2a_ctrl_mapping)
/*
* This IOCTL is meant to read back to the user the base address and length of
* the memory-region specified to the driver for use with mmap.
*/
#define ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG \
_IOWR(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \
0x01, struct aspeed_p2a_ctrl_mapping)
#endif /* _LINUX_ASPEED_P2A_CTRL_H */
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