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62 lines
1.9 KiB
62 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
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/* |
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* Copyright 2019 Google Inc |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version |
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* 2 of the License, or (at your option) any later version. |
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* |
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* Provides a simple driver to control the ASPEED P2A interface which allows |
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* the host to read and write to various regions of the BMC's memory. |
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*/ |
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#ifndef _UAPI_LINUX_ASPEED_P2A_CTRL_H |
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#define _UAPI_LINUX_ASPEED_P2A_CTRL_H |
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#include <linux/ioctl.h> |
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#include <linux/types.h> |
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#define ASPEED_P2A_CTRL_READ_ONLY 0 |
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#define ASPEED_P2A_CTRL_READWRITE 1 |
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/* |
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* This driver provides a mechanism for enabling or disabling the read-write |
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* property of specific windows into the ASPEED BMC's memory. |
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* |
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* A user can map a region of the BMC's memory as read-only or read-write, with |
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* the caveat that once any region is mapped, all regions are unlocked for |
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* reading. |
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*/ |
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/* |
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* Unlock a region of BMC physical memory for access from the host. |
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* |
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* Also used to read back the optional memory-region configuration for the |
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* driver. |
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*/ |
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struct aspeed_p2a_ctrl_mapping { |
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__u64 addr; |
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__u32 length; |
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__u32 flags; |
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}; |
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#define __ASPEED_P2A_CTRL_IOCTL_MAGIC 0xb3 |
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/* |
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* This IOCTL is meant to configure a region or regions of memory given a |
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* starting address and length to be readable by the host, or |
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* readable-writeable. |
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*/ |
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#define ASPEED_P2A_CTRL_IOCTL_SET_WINDOW _IOW(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \ |
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0x00, struct aspeed_p2a_ctrl_mapping) |
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/* |
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* This IOCTL is meant to read back to the user the base address and length of |
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* the memory-region specified to the driver for use with mmap. |
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*/ |
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#define ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG \ |
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_IOWR(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \ |
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0x01, struct aspeed_p2a_ctrl_mapping) |
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#endif /* _UAPI_LINUX_ASPEED_P2A_CTRL_H */
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