82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/*
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* \brief Low-level page-fault handling
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* \author Norman Feske
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* \date 2010-01-25
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*/
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/*
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* Copyright (C) 2010-2017 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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/* Genode includes */
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#include <base/thread.h>
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/* Core includes */
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#include <ipc_pager.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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using namespace Genode;
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Ipc_pager::Ipc_pager(Nova::Utcb &utcb, addr_t pd_dst, addr_t pd_core)
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:
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_pd_dst(pd_dst),
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_pd_core(pd_core),
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_fault_ip(utcb.ip),
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_fault_addr(utcb.qual[1]),
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_sp(utcb.sp),
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_fault_type(utcb.qual[0]),
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_syscall_res(Nova::NOVA_OK),
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_normal_ipc((((addr_t)&utcb.qual[2] - (addr_t)utcb.msg()) / sizeof(addr_t))
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== utcb.msg_words())
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{
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/*
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* When this function is called from the page-fault handler EC, a page
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* fault already occurred. So we never wait but immediately read the
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* page-fault information from our UTCB.
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*/
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}
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void Ipc_pager::set_reply_mapping(Mapping m)
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{
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Nova::Utcb &utcb = *(Nova::Utcb *)Thread::myself()->utcb();
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utcb.set_msg_word(0);
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bool res = utcb.append_item(m.mem_crd(), 0, true, false,
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false, m.dma(), m.write_combined());
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/* one item ever fits on the UTCB */
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(void)res;
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/* receive window in destination pd */
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Nova::Mem_crd crd_mem(m.dst_addr() >> 12, m.mem_crd().order(),
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Nova::Rights(m.mem_crd().rights().readable(),
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m.mem_crd().rights().writeable(),
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m.mem_crd().rights().executable()));
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/* asynchronously map memory */
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_syscall_res = Nova::delegate(_pd_core, _pd_dst, crd_mem);
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}
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void Ipc_pager::reply_and_wait_for_fault(addr_t sm)
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{
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Thread &myself = *Thread::myself();
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Nova::Utcb &utcb = *reinterpret_cast<Nova::Utcb *>(myself.utcb());
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utcb.mtd = 0;
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/*
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* If it was a normal IPC and the mapping failed, caller may re-try.
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* Otherwise nothing left to be delegated - done asynchronously beforehand.
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*/
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utcb.set_msg_word((_normal_ipc && _syscall_res != Nova::NOVA_OK) ? 1 : 0);
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Nova::reply(myself.stack_top(), sm);
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}
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