mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-23 23:42:32 +00:00
174 lines
3.9 KiB
C++
174 lines
3.9 KiB
C++
/*
|
|
* \brief Fiasco pager support
|
|
* \author Christian Helmuth
|
|
* \date 2006-06-14
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2011 Genode Labs GmbH
|
|
*
|
|
* 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, unsigned l2size = L4_LOG2_PAGESIZE,
|
|
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_ */
|