74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
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/* SPDX-License-Identifier: MIT */
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/* Copyright (C) 2006-2017 Oracle Corporation */
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#ifndef __HGSMI_DEFS_H__
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#define __HGSMI_DEFS_H__
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/* Buffer sequence type mask. */
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#define HGSMI_BUFFER_HEADER_F_SEQ_MASK 0x03
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/* Single buffer, not a part of a sequence. */
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#define HGSMI_BUFFER_HEADER_F_SEQ_SINGLE 0x00
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/* The first buffer in a sequence. */
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#define HGSMI_BUFFER_HEADER_F_SEQ_START 0x01
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/* A middle buffer in a sequence. */
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#define HGSMI_BUFFER_HEADER_F_SEQ_CONTINUE 0x02
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/* The last buffer in a sequence. */
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#define HGSMI_BUFFER_HEADER_F_SEQ_END 0x03
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/* 16 bytes buffer header. */
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struct hgsmi_buffer_header {
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u32 data_size; /* Size of data that follows the header. */
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u8 flags; /* HGSMI_BUFFER_HEADER_F_* */
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u8 channel; /* The channel the data must be routed to. */
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u16 channel_info; /* Opaque to the HGSMI, used by the channel. */
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union {
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/* Opaque placeholder to make the union 8 bytes. */
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u8 header_data[8];
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/* HGSMI_BUFFER_HEADER_F_SEQ_SINGLE */
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struct {
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u32 reserved1; /* A reserved field, initialize to 0. */
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u32 reserved2; /* A reserved field, initialize to 0. */
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} buffer;
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/* HGSMI_BUFFER_HEADER_F_SEQ_START */
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struct {
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/* Must be the same for all buffers in the sequence. */
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u32 sequence_number;
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/* The total size of the sequence. */
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u32 sequence_size;
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} sequence_start;
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/*
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* HGSMI_BUFFER_HEADER_F_SEQ_CONTINUE and
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* HGSMI_BUFFER_HEADER_F_SEQ_END
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*/
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struct {
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/* Must be the same for all buffers in the sequence. */
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u32 sequence_number;
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/* Data offset in the entire sequence. */
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u32 sequence_offset;
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} sequence_continue;
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} u;
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} __packed;
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/* 8 bytes buffer tail. */
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struct hgsmi_buffer_tail {
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/* Reserved, must be initialized to 0. */
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u32 reserved;
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/*
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* One-at-a-Time Hash: https://www.burtleburtle.net/bob/hash/doobs.html
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* Over the header, offset and for first 4 bytes of the tail.
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*/
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u32 checksum;
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} __packed;
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/*
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* The size of the array of channels. Array indexes are u8.
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* Note: the value must not be changed.
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*/
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#define HGSMI_NUMBER_OF_CHANNELS 0x100
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#endif
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