159 lines
3.6 KiB
C++
159 lines
3.6 KiB
C++
/**
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* \brief Block driver session creation
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* \author Sebastian Sumpf
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* \date 2015-09-29
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*/
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/*
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* Copyright (C) 2015 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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#include <block/component.h>
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#include <os/config.h>
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#include <os/server.h>
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#include <util/xml_node.h>
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#include "ahci.h"
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namespace Block {
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class Factory;
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class Root_multiple_clients;
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}
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struct Block::Factory : Driver_factory
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{
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long device_num;
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Block::Driver *create()
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{
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return Ahci_driver::claim_port(device_num);
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}
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void destroy(Block::Driver *driver)
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{
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Ahci_driver::free_port(device_num);
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}
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Factory(long device_num) : device_num(device_num) { }
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};
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class Session_component : public Block::Session_component
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{
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public:
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Session_component(Block::Driver_factory &driver_factory,
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Server::Entrypoint &ep, Genode::size_t buf_size)
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: Block::Session_component(driver_factory, ep, buf_size) { }
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Block::Driver_factory &factory() { return _driver_factory; }
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};
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class Block::Root_multiple_clients : public Root_component< ::Session_component>,
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public Ahci_root
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{
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private:
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Server::Entrypoint &_ep;
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long _device_num(const char *session_label)
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{
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long num = -1;
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try {
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using namespace Genode;
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Xml_node policy = Genode::config()->xml_node().sub_node("policy");
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for (;; policy = policy.next("policy")) {
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char label_buf[64];
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policy.attribute("label").value(label_buf, sizeof(label_buf));
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if (Genode::strcmp(session_label, label_buf))
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continue;
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/* read device attribute */
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policy.attribute("device").value(&num);
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break;
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}
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} catch (...) {}
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return num;
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}
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protected:
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::Session_component *_create_session(const char *args)
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{
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size_t tx_buf_size =
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Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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/* TODO: build quota check */
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/* Search for configured device */
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char label_buf[64];
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Genode::Arg_string::find_arg(args,
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"label").string(label_buf,
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sizeof(label_buf),
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"<unlabeled>");
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long num = _device_num(label_buf);
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if (num < 0) {
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PERR("No confguration found for client: %s", label_buf);
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throw Root::Invalid_args();
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}
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if (!Ahci_driver::is_avail(num)) {
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PERR("Device %ld not avaiable", num);
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throw Root::Unavailable();
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}
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Factory *factory = new (Genode::env()->heap()) Factory(num);
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return new (md_alloc()) ::Session_component(*factory,
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_ep, tx_buf_size);
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}
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void _destroy_session(::Session_component *session)
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{
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Driver_factory &factory = session->factory();
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destroy(env()->heap(), session);
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destroy(env()->heap(), &factory);
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}
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public:
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Root_multiple_clients(Server::Entrypoint &ep, Allocator *md_alloc)
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: Root_component(&ep.rpc_ep(), md_alloc), _ep(ep) { }
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Server::Entrypoint &entrypoint() override { return _ep; }
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void announce() override
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{
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Genode::env()->parent()->announce(_ep.manage(*this));
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}
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};
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struct Main
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{
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Block::Root_multiple_clients root;
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Main(Server::Entrypoint &ep)
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: root(ep, Genode::env()->heap())
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{
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PINF("--- Starting AHCI driver -> done right .-) --\n");
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Ahci_driver::init(root);
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}
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};
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namespace Server {
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char const *name() { return "ahci_ep"; }
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size_t stack_size() { return 2 * 1024 * sizeof(long); }
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void construct(Entrypoint &ep) { static Main server(ep); }
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}
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