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103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
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/*
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* \brief C-API Genode block backend
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* \author Stefan Kalkowski
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* \date 2021-07-05
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*/
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/*
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* Copyright (C) 2006-2021 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _GENODE_C_API__BLOCK_H_
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#define _GENODE_C_API__BLOCK_H_
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#include <genode_c_api/base.h>
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struct genode_block_session; /* definition is private to the implementation */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/********************
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** Initialization **
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********************/
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/**
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* Callback called during peer session request to allocate dma-capable shared buffer
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*/
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typedef struct genode_attached_dataspace * (*genode_block_alloc_peer_buffer_t)
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(unsigned long size);
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/**
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* Callback called when closing peer session to free shared buffer
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*/
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typedef void (*genode_block_free_peer_buffer_t)
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(struct genode_attached_dataspace * ds);
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/**
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* Initialize block root component
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*
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* \param handler signal handler to be installed at each block session
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*/
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void genode_block_init(struct genode_env *env,
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struct genode_allocator *alloc,
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struct genode_signal_handler *handler,
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genode_block_alloc_peer_buffer_t,
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genode_block_free_peer_buffer_t);
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/**************************************
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** Block device lifetime management **
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**************************************/
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typedef unsigned long long genode_block_sector_t;
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void genode_block_announce_device(const char * name,
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genode_block_sector_t sectors,
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int writeable);
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void genode_block_discontinue_device(const char * name);
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/************************************
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** Block session request handling **
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************************************/
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enum Operation {
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GENODE_BLOCK_READ,
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GENODE_BLOCK_WRITE,
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GENODE_BLOCK_SYNC,
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GENODE_BLOCK_UNAVAIL,
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};
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struct genode_block_request {
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int op;
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genode_block_sector_t blk_nr;
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genode_block_sector_t blk_cnt;
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void * addr;
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};
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struct genode_block_session * genode_block_session_by_name(const char * name);
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struct genode_block_request *
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genode_block_request_by_session(struct genode_block_session * const session);
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void genode_block_ack_request(struct genode_block_session * const session,
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struct genode_block_request * const request,
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int success);
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void genode_block_notify_peers(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _GENODE_C_API__BLOCK_H_ */
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