258 lines
7.4 KiB
C
258 lines
7.4 KiB
C
#ifndef _IPXE_INTERFACE_H
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#define _IPXE_INTERFACE_H
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/** @file
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*
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* Object interfaces
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stddef.h>
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#include <ipxe/refcnt.h>
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/** An object interface operation */
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struct interface_operation {
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/** Operation type */
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void *type;
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/** Implementing method */
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void *func;
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};
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/**
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* Define an object interface operation
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*
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* @v op_type Operation type
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* @v object_type Implementing method's expected object type
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* @v op_func Implementing method
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* @ret op Object interface operation
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*/
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#define INTF_OP( op_type, object_type, op_func ) { \
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.type = op_type, \
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.func = ( ( ( ( typeof ( op_func ) * ) NULL ) == \
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( ( op_type ## _TYPE ( object_type ) * ) NULL ) ) \
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? op_func : op_func ), \
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}
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/** An object interface descriptor */
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struct interface_descriptor {
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/** Offset of interface within containing object */
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size_t offset;
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/** Number of interface operations */
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unsigned int num_op;
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/** Object interface operations */
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struct interface_operation *op;
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/** Offset to pass-through interface, if present */
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ssize_t passthru_offset;
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};
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#define intf_offset( object_type, intf ) \
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( ( ( ( typeof ( ( ( object_type * ) NULL )->intf ) * ) NULL ) \
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== ( ( struct interface * ) NULL ) ) \
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? offsetof ( object_type, intf ) \
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: offsetof ( object_type, intf ) )
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/**
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* Define an object interface descriptor
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*
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* @v object_type Containing object data type
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* @v intf Interface name (i.e. field within object data type)
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* @v operations Object interface operations array
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* @ret desc Object interface descriptor
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*/
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#define INTF_DESC( object_type, intf, operations ) { \
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.offset = intf_offset ( object_type, intf ), \
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.op = operations, \
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.num_op = ( sizeof ( operations ) / \
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sizeof ( operations[0] ) ), \
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.passthru_offset = 0, \
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}
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/**
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* Define an object interface descriptor with pass-through interface
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*
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* @v object_type Containing object data type
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* @v intf Interface name (i.e. field within object data type)
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* @v operations Object interface operations array
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* @v passthru Pass-through interface name
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* @ret desc Object interface descriptor
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*/
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#define INTF_DESC_PASSTHRU( object_type, intf, operations, passthru ) { \
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.offset = offsetof ( object_type, intf ), \
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.op = operations, \
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.num_op = ( sizeof ( operations ) / \
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sizeof ( operations[0] ) ), \
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.passthru_offset = ( intf_offset ( object_type, passthru ) - \
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intf_offset ( object_type, intf ) ), \
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}
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/**
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* Define an object interface descriptor for a pure-interface object
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*
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* @v operations Object interface operations array
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* @ret desc Object interface descriptor
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*
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* A pure-interface object is an object that consists solely of a
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* single interface.
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*/
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#define INTF_DESC_PURE( operations ) { \
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.offset = 0, \
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.op = operations, \
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.num_op = ( sizeof ( operations ) / \
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sizeof ( operations[0] ) ), \
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.passthru_offset = 0, \
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}
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/** An object interface */
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struct interface {
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/** Destination object interface
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*
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* When the containing object invokes an operation on this
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* interface, it will be executed by the destination object.
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*
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* This pointer may never be NULL. When the interface is
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* unplugged, it should point to the null interface.
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*/
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struct interface *dest;
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/** Reference counter
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*
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* If this interface is not part of a reference-counted
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* object, this field may be NULL.
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*/
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struct refcnt *refcnt;
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/** Interface descriptor */
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struct interface_descriptor *desc;
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/** Original interface descriptor
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*
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* Used by intf_reinit().
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*/
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struct interface_descriptor *original;
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};
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extern void intf_plug ( struct interface *intf, struct interface *dest );
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extern void intf_plug_plug ( struct interface *a, struct interface *b );
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extern void intf_unplug ( struct interface *intf );
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extern void intf_nullify ( struct interface *intf );
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extern struct interface * intf_get ( struct interface *intf );
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extern void intf_put ( struct interface *intf );
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extern void * __attribute__ (( pure )) intf_object ( struct interface *intf );
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extern void * intf_get_dest_op_no_passthru_untyped ( struct interface *intf,
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void *type,
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struct interface **dest );
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extern void * intf_get_dest_op_untyped ( struct interface *intf, void *type,
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struct interface **dest );
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extern void intf_close ( struct interface *intf, int rc );
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#define intf_close_TYPE( object_type ) \
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typeof ( void ( object_type, int rc ) )
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extern void intf_shutdown ( struct interface *intf, int rc );
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extern void intf_restart ( struct interface *intf, int rc );
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extern void intf_poke ( struct interface *intf,
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void ( type ) ( struct interface *intf ) );
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#define intf_poke_TYPE( object_type ) \
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typeof ( void ( object_type ) )
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extern struct interface_descriptor null_intf_desc;
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extern struct interface null_intf;
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/**
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* Initialise an object interface
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*
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* @v intf Object interface
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* @v desc Object interface descriptor
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* @v refcnt Containing object reference counter, or NULL
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*/
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static inline void intf_init ( struct interface *intf,
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struct interface_descriptor *desc,
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struct refcnt *refcnt ) {
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intf->dest = &null_intf;
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intf->refcnt = refcnt;
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intf->desc = desc;
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intf->original = desc;
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}
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/**
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* Initialise a static object interface
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*
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* @v descriptor Object interface descriptor
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*/
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#define INTF_INIT( descriptor ) { \
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.dest = &null_intf, \
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.refcnt = NULL, \
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.desc = &(descriptor), \
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.original = &(descriptor), \
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}
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/**
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* Get object interface destination and operation method (without pass-through)
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*
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* @v intf Object interface
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* @v type Operation type
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* @ret dest Destination interface
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* @ret func Implementing method, or NULL
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*/
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#define intf_get_dest_op_no_passthru( intf, type, dest ) \
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( ( type ## _TYPE ( void * ) * ) \
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intf_get_dest_op_no_passthru_untyped ( intf, type, dest ) )
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/**
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* Get object interface destination and operation method
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*
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* @v intf Object interface
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* @v type Operation type
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* @ret dest Destination interface
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* @ret func Implementing method, or NULL
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*/
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#define intf_get_dest_op( intf, type, dest ) \
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( ( type ## _TYPE ( void * ) * ) \
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intf_get_dest_op_untyped ( intf, type, dest ) )
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/**
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* Find debugging colourisation for an object interface
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*
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* @v intf Object interface
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* @ret col Debugging colourisation
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*
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* Use as the first argument to DBGC() or equivalent macro.
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*/
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#define INTF_COL( intf ) intf_object ( intf )
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/** printf() format string for INTF_DBG() */
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#define INTF_FMT "%p+%zx"
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/**
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* printf() arguments for representing an object interface
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*
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* @v intf Object interface
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* @ret args printf() argument list corresponding to INTF_FMT
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*/
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#define INTF_DBG( intf ) intf_object ( intf ), (intf)->desc->offset
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/** printf() format string for INTF_INTF_DBG() */
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#define INTF_INTF_FMT INTF_FMT "->" INTF_FMT
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/**
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* printf() arguments for representing an object interface pair
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*
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* @v intf Object interface
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* @v dest Destination object interface
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* @ret args printf() argument list corresponding to INTF_INTF_FMT
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*/
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#define INTF_INTF_DBG( intf, dest ) INTF_DBG ( intf ), INTF_DBG ( dest )
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/**
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* Reinitialise an object interface
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*
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* @v intf Object interface
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*/
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static inline void intf_reinit ( struct interface *intf ) {
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/* Restore original interface descriptor */
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intf->desc = intf->original;
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}
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#endif /* _IPXE_INTERFACE_H */
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