142 lines
2.7 KiB
C++
142 lines
2.7 KiB
C++
/*
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* \brief Low-level page-fault handling
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* \author Norman Feske
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* \date 2009-10-02
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*/
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/*
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* Copyright (C) 2009-2013 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__BASE__IPC_PAGER_H_
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#define _INCLUDE__BASE__IPC_PAGER_H_
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/* Genode includes */
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#include <base/cache.h>
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#include <base/ipc.h>
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#include <base/stdint.h>
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#include <base/native_types.h>
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#include <base/printf.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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namespace Genode {
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class Mapping
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{
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private:
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addr_t _dst_addr;
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addr_t _core_local_addr;
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bool _write_combined;
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size_t _size_log2;
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bool _rw;
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enum { PAGE_SIZE_LOG2 = 12 };
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public:
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/**
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* Constructor
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*/
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Mapping(addr_t dst_addr, addr_t map_addr,
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Cache_attribute c, bool io_mem,
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unsigned size_log2 = PAGE_SIZE_LOG2,
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bool rw = true)
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:
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_dst_addr(dst_addr), _core_local_addr(map_addr),
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_write_combined(c != CACHED), _size_log2(size_log2),
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_rw(rw)
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{ }
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/**
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* Construct invalid mapping
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*/
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Mapping() : _size_log2(0) { }
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void prepare_map_operation() { }
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Nova::Mem_crd mem_crd()
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{
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return Nova::Mem_crd(_core_local_addr >> PAGE_SIZE_LOG2,
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_size_log2 - PAGE_SIZE_LOG2,
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Nova::Rights(true, _rw, true));
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}
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bool write_combined() { return _write_combined; };
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addr_t dst_addr() { return _dst_addr; }
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};
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class Ipc_pager
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{
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private:
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/**
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* Page-fault type
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*/
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enum Pf_type {
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TYPE_READ = 0x4,
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TYPE_WRITE = 0x2,
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TYPE_EXEC = 0x1,
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};
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addr_t _fault_ip;
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addr_t _fault_addr;
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Pf_type _fault_type;
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public:
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/**
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* Wait for page-fault info
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*
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* After returning from this call, 'fault_ip' and 'fault_addr'
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* have a defined state.
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*/
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void wait_for_fault();
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/**
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* Answer current page fault
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*/
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void reply_and_wait_for_fault();
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/**
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* Request instruction pointer of current fault
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*/
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addr_t fault_ip() { return _fault_ip; }
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/**
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* Request page-fault address of current fault
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*/
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addr_t fault_addr() { return _fault_addr; }
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/**
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* Set page-fault reply parameters
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*/
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void set_reply_mapping(Mapping m);
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/**
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* Return true if fault was a write fault
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*/
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bool is_write_fault() const { return _fault_type == TYPE_WRITE; }
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/**
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* Return true if last fault was an exception
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*/
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bool is_exception() const
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{
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/*
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* Reflection of exceptions is not supported on this platform.
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*/
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return false;
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}
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};
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}
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#endif /* _INCLUDE__BASE__IPC_PAGER_H_ */
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