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150 lines
3.5 KiB
C++
150 lines
3.5 KiB
C++
/*
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* \brief Block-driver interface
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* \author Christian Helmuth
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* \author Sebastian Sumpf
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* \author Stefan kalkowski
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* \date 2011-05-23
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*/
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/*
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* Copyright (C) 2011-2013 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 General Public License version 2.
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*/
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#ifndef _INCLUDE__BLOCK__DRIVER_H_
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#define _INCLUDE__BLOCK__DRIVER_H_
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#include <base/exception.h>
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#include <base/stdint.h>
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#include <base/signal.h>
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#include <ram_session/ram_session.h>
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#include <block_session/block_session.h>
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namespace Block {
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class Session_component;
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struct Driver;
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struct Driver_factory;
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};
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/**
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* Interface to be implemented by the device-specific driver code
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*/
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struct Block::Driver
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{
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Session_component *session;
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/**
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* Exceptions
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*/
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class Io_error : public ::Genode::Exception { };
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/**
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* Request block size for driver and medium
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*/
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virtual Genode::size_t block_size() = 0;
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/**
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* Request capacity of medium in blocks
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*/
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virtual Genode::size_t block_count() = 0;
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/**
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* Request operations supported by the device
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*/
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virtual Session::Operations ops() = 0;
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/**
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* Read from medium
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*
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* \param block_number number of first block to read
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* \param block_count number of blocks to read
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* \param buffer output buffer for read request
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*/
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virtual void read(Genode::size_t block_number,
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Genode::size_t block_count,
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char * buffer,
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Packet_descriptor &packet) {
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throw Io_error(); }
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/**
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* Write to medium
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*
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* \param block_number number of first block to write
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* \param block_count number of blocks to write
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* \param buffer buffer for write request
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*/
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virtual void write(Genode::size_t block_number,
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Genode::size_t block_count,
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const char * buffer,
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Packet_descriptor &packet) {
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throw Io_error(); }
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/**
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* Read from medium using DMA
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*
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* \param block_number number of first block to read
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* \param block_count number of blocks to read
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* \param phys phyiscal address of read buffer
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*/
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virtual void read_dma(Genode::size_t block_number,
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Genode::size_t block_count,
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Genode::addr_t phys,
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Packet_descriptor &packet) {
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throw Io_error(); }
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/**
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* Write to medium using DMA
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*
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* \param block_number number of first block to write
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* \param block_count number of blocks to write
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* \param phys physical address of write buffer
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*/
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virtual void write_dma(Genode::size_t block_number,
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Genode::size_t block_count,
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Genode::addr_t phys,
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Packet_descriptor &packet) {
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throw Io_error(); }
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/**
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* Check if DMA is enabled for driver
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*
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* \return true if DMA is enabled, false otherwise
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*/
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virtual bool dma_enabled() { return false; }
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/**
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* Allocate buffer which is suitable for DMA.
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*/
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virtual Genode::Ram_dataspace_capability
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alloc_dma_buffer(Genode::size_t size) {
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return Genode::env()->ram_session()->alloc(size, false); }
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/**
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* Synchronize with with device.
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*/
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virtual void sync() {}
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};
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/**
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* Interface for constructing the driver object
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*/
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struct Block::Driver_factory
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{
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/**
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* Construct new driver
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*/
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virtual Driver *create() = 0;
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/**
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* Destroy driver
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*/
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virtual void destroy(Driver *driver) = 0;
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};
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#endif /* _BLOCK__DRIVER_H_ */
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