genode/repos/base-fiasco/include/base/ipc_pager.h

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/*
* \brief Fiasco pager support
* \author Christian Helmuth
* \date 2006-06-14
*/
/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__BASE__IPC_PAGER_H_
#define _INCLUDE__BASE__IPC_PAGER_H_
/* Genode includes */
#include <base/ipc.h>
#include <base/stdint.h>
#include <base/native_types.h>
#include <fiasco/thread_helper.h>
#include <util/touch.h>
/* Fiasco includes */
namespace Fiasco {
#include <l4/sys/types.h>
}
namespace Genode {
class Mapping
{
private:
addr_t _dst_addr;
Fiasco::l4_fpage_t _fpage;
public:
/**
* Constructor
*/
Mapping(addr_t dst_addr, addr_t src_addr,
bool write_combined, bool io_mem,
unsigned l2size = L4_LOG2_PAGESIZE,
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bool rw = true, bool grant = false)
:
_dst_addr(dst_addr),
_fpage(Fiasco::l4_fpage(src_addr, l2size, rw, grant))
{
if (write_combined)
_fpage.fp.cache = Fiasco::L4_FPAGE_BUFFERABLE;
}
/**
* Construct invalid flexpage
*/
Mapping() : _dst_addr(0), _fpage(Fiasco::l4_fpage(0, 0, 0, 0)) { }
Fiasco::l4_umword_t dst_addr() const { return _dst_addr; }
Fiasco::l4_fpage_t fpage() const { return _fpage; }
/**
* Prepare map operation
*
* On Fiasco, we need to map a page locally to be able to map it to
* another address space.
*/
void prepare_map_operation()
{
addr_t core_local_addr = _fpage.fp.page << 12;
size_t mapping_size = 1 << _fpage.fp.size;
for (addr_t i = 0; i < mapping_size; i += L4_PAGESIZE) {
if (_fpage.fp.write)
touch_read_write((unsigned char volatile *)(core_local_addr + i));
else
touch_read((unsigned char const volatile *)(core_local_addr + i));
}
}
};
/**
* Special paging server class
*/
class Ipc_pager : public Native_capability
{
private:
Native_thread_id _last; /* origin of last fault message */
addr_t _pf_addr; /* page-fault address */
addr_t _pf_ip; /* instruction pointer of faulter */
Mapping _reply_mapping; /* page-fault answer */
public:
/**
* Constructor
*/
Ipc_pager();
/**
* Wait for a new page fault received as short message IPC
*/
void wait_for_fault();
/**
* Reply current page-fault and wait for a new one
*
* Send short flex page and wait for next short-message (register)
* IPC -- pagefault
*/
void reply_and_wait_for_fault();
/**
* Request instruction pointer of current page fault
*/
addr_t fault_ip() { return _pf_ip; }
/**
* Request fault address of current page fault
*/
addr_t fault_addr() { return _pf_addr & ~3; }
/**
* Set parameters for next reply
*/
void set_reply_mapping(Mapping m) { _reply_mapping = m; }
/**
* Set destination for next reply
*/
void set_reply_dst(Native_capability pager_object) {
_last.raw = pager_object.local_name(); }
/**
* Answer call without sending a flex-page mapping
*
* This function is used to acknowledge local calls from one of
* core's region-manager sessions.
*/
void acknowledge_wakeup();
/**
* Return thread ID of last faulter
*/
Native_thread_id last() const { return _last; }
/**
* Return badge for faulting thread
*
* As Fiasco has no server-defined badges for page-fault messages, we
* interpret the sender ID as badge.
*/
unsigned long badge() const {
return convert_native_thread_id_to_badge(_last); }
bool is_write_fault() const { return (_pf_addr & 2); }
/**
* Return true if last fault was an exception
*/
bool is_exception() const
{
/*
* Reflection of exceptions is not supported on this platform.
*/
return false;
}
};
}
#endif /* _INCLUDE__BASE__IPC_PAGER_H_ */