drivers/gpu/drm/vboxvideo/hgsmi_defs.h

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/vboxvideo/hgsmi_defs.h

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/vboxvideo/hgsmi_defs.h
Extension
.h
Size
2079 bytes
Lines
74
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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

Annotation

Implementation Notes