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