ipc4_message_request Struct Reference

Standard 64-bit IPC4 message request envelope. More...

#include <src/include/ipc4/header.h>

Data Fields
union {
uint32_t   dat
	Raw 32-bit Primary register value. More...
struct {
uint32_t   rsvd0: 24
	Command-specific payload, pipeline ID, or module/instance identifier. More...
uint32_t   type: 5
	5-bit message opcode (enum ipc4_message_type or enum sof_ipc4_module_type). More...
uint32_t   rsp: 1
	Direction: 0 for request/notification (SOF_IPC4_MESSAGE_DIR_MSG_REQUEST). More...
uint32_t   msg_tgt: 1
	Target selector: 0 for global firmware, 1 for module instance. More...
uint32_t   _reserved_0: 1
	Hardware reserved control bit. More...
}   r
}	primary
union {
uint32_t   dat
	Raw 32-bit Extension register value. More...
struct {
uint32_t   ext_data: 30
	Command-specific extension payload, buffer offsets, or parameter flags. More...
uint32_t   _reserved_0: 2
	Hardware reserved control bits. More...
}   r
}	extension

Detailed Description

Standard 64-bit IPC4 message request envelope.

Used for all host-to-DSP command requests. When msg_tgt is SOF_IPC4_MESSAGE_TARGET_FW_GEN_MSG, the type field is one of ipc4_message_type. When msg_tgt is SOF_IPC4_MESSAGE_TARGET_MODULE_MSG, type is one of sof_ipc4_module_type.

Field Documentation

_reserved_0

uint32_t ipc4_message_request::_reserved_0

Hardware reserved control bit.

Hardware reserved control bits.

dat

uint32_t ipc4_message_request::dat

Raw 32-bit Primary register value.

Raw 32-bit Extension register value.

ext_data

uint32_t ipc4_message_request::ext_data

Command-specific extension payload, buffer offsets, or parameter flags.

[union]

union { ... } ipc4_message_request::extension

msg_tgt

uint32_t ipc4_message_request::msg_tgt

Target selector: 0 for global firmware, 1 for module instance.

[union]

union { ... } ipc4_message_request::primary

[struct] [1/2]

struct { ... } ipc4_message_request::r

[struct] [2/2]

struct { ... } ipc4_message_request::r

rsp

uint32_t ipc4_message_request::rsp

Direction: 0 for request/notification (SOF_IPC4_MESSAGE_DIR_MSG_REQUEST).

rsvd0

uint32_t ipc4_message_request::rsvd0

Command-specific payload, pipeline ID, or module/instance identifier.

type

uint32_t ipc4_message_request::type

5-bit message opcode (enum ipc4_message_type or enum sof_ipc4_module_type).

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The documentation for this struct was generated from the following file:

• src/include/ipc4/header.h