177 lines
4.0 KiB
C++
177 lines
4.0 KiB
C++
/*
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* \brief Fiasco pager support
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* \author Christian Helmuth
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* \date 2006-06-14
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*/
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/*
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* Copyright (C) 2006-2013 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 _CORE__INCLUDE__IPC_PAGER_H_
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#define _CORE__INCLUDE__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 <util/touch.h>
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/* base-internal includes */
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#include <base/internal/fiasco_thread_helper.h>
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/types.h>
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}
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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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Fiasco::l4_fpage_t _fpage;
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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 src_addr,
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Cache_attribute cacheability, bool io_mem,
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unsigned l2size = L4_LOG2_PAGESIZE,
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bool rw = true, bool grant = false)
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:
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_dst_addr(dst_addr),
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_fpage(Fiasco::l4_fpage(src_addr, l2size, rw, grant))
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{
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if (cacheability == WRITE_COMBINED)
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_fpage.fp.cache = Fiasco::L4_FPAGE_BUFFERABLE;
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}
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/**
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* Construct invalid flexpage
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*/
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Mapping() : _dst_addr(0), _fpage(Fiasco::l4_fpage(0, 0, 0, 0)) { }
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Fiasco::l4_umword_t dst_addr() const { return _dst_addr; }
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Fiasco::l4_fpage_t fpage() const { return _fpage; }
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/**
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* Prepare map operation
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*
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* On Fiasco, we need to map a page locally to be able to map it to
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* another address space.
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*/
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void prepare_map_operation()
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{
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addr_t core_local_addr = _fpage.fp.page << 12;
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size_t mapping_size = 1 << _fpage.fp.size;
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for (addr_t i = 0; i < mapping_size; i += L4_PAGESIZE) {
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if (_fpage.fp.write)
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touch_read_write((unsigned char volatile *)(core_local_addr + i));
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else
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touch_read((unsigned char const volatile *)(core_local_addr + i));
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}
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}
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};
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/**
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* Special paging server class
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*/
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class Ipc_pager
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{
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private:
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Native_thread_id _last; /* origin of last fault message */
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addr_t _pf_addr; /* page-fault address */
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addr_t _pf_ip; /* instruction pointer of faulter */
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Mapping _reply_mapping; /* page-fault answer */
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public:
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/**
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* Wait for a new page fault received as short message IPC
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*/
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void wait_for_fault();
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/**
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* Reply current page-fault and wait for a new one
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*
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* Send short flex page and wait for next short-message (register)
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* IPC -- pagefault
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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 page fault
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*/
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addr_t fault_ip() { return _pf_ip; }
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/**
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* Request fault address of current page fault
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*/
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addr_t fault_addr() { return _pf_addr & ~3; }
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/**
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* Set parameters for next reply
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*/
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void set_reply_mapping(Mapping m) { _reply_mapping = m; }
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/**
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* Set destination for next reply
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*/
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void set_reply_dst(Native_capability pager_object) {
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_last.raw = pager_object.local_name(); }
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/**
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* Answer call without sending a flex-page mapping
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*
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* This function is used to acknowledge local calls from one of
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* core's region-manager sessions.
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*/
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void acknowledge_wakeup();
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/**
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* Returns true if the last request was send from a core thread
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*/
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bool request_from_core()
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{
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enum { CORE_TASK_ID = 4 };
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return _last.id.task == CORE_TASK_ID;
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}
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/**
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* Return badge for faulting thread
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*
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* As Fiasco has no server-defined badges for page-fault messages, we
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* interpret the sender ID as badge.
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*/
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unsigned long badge() const {
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return convert_native_thread_id_to_badge(_last); }
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bool is_write_fault() const { return (_pf_addr & 2); }
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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 /* _CORE__INCLUDE__IPC_PAGER_H_ */
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