genode/repos/base-foc/include/base/ipc_pager.h
Stefan Kalkowski 786fe805da base: introduce caching attributes (fix #1184)
On ARM it's relevant to not only distinguish between ordinary cached memory
and write-combined one, but also having non-cached memory too. To insert the
appropriated page table entries e.g.: in the base-hw kernel, we need to preserve
the information about the kind of memory from allocation until the pager
resolves a page fault. Therefore, this commit introduces a new Cache_attribute
type, and replaces the write_combined boolean with the new type where necessary.
2014-06-26 10:57:26 +02:00

202 lines
4.7 KiB
C++

/*
* \brief Fiasco.OC pager support
* \author Christian Helmuth
* \author Stefan Kalkowski
* \date 2006-06-14
*/
/*
* Copyright (C) 2006-2013 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/cache.h>
#include <base/ipc.h>
#include <base/stdint.h>
#include <base/native_types.h>
#include <base/thread_state.h>
#include <util/touch.h>
/* Fiasco includes */
namespace Fiasco {
#include <l4/sys/types.h>
}
namespace Genode {
class Mapping
{
private:
addr_t _dst_addr;
addr_t _src_addr;
Cache_attribute _cacheability;
bool _iomem;
unsigned _log2size;
bool _rw;
bool _grant;
public:
/**
* Constructor
*/
Mapping(addr_t dst_addr, addr_t src_addr,
Cache_attribute c, bool io_mem,
unsigned l2size = L4_LOG2_PAGESIZE,
bool rw = true, bool grant = false)
: _dst_addr(dst_addr), _src_addr(src_addr),
_cacheability(c), _iomem(io_mem), _log2size(l2size),
_rw(rw), _grant(grant) { }
/**
* Construct invalid flexpage
*/
Mapping() : _dst_addr(0), _src_addr(0), _cacheability(UNCACHED),
_iomem(false), _log2size(0), _rw(false), _grant(false) { }
Fiasco::l4_umword_t dst_addr() const { return _dst_addr; }
bool grant() const { return _grant; }
Fiasco::l4_fpage_t fpage() const
{
unsigned char rights = _rw ? Fiasco::L4_FPAGE_RWX : Fiasco::L4_FPAGE_RX;
return Fiasco::l4_fpage(_src_addr, _log2size, rights);
}
Cache_attribute cacheability() const { return _cacheability; }
bool iomem() { return _iomem; }
/**
* Prepare map operation is not needed on Fiasco.OC, since we clear the
* dataspace before this function is called.
*/
void prepare_map_operation() { }
};
/**
* Special paging server class
*/
class Ipc_pager : public Native_capability
{
public:
enum Msg_type { PAGEFAULT, WAKE_UP, PAUSE, EXCEPTION };
private:
Native_thread _last; /* origin of last fault */
addr_t _pf_addr; /* page-fault address */
addr_t _pf_ip; /* ip of faulter */
Mapping _reply_mapping; /* page-fault answer */
unsigned long _badge; /* badge of faulting thread */
Fiasco::l4_msgtag_t _tag; /* receive message tag */
Fiasco::l4_exc_regs_t _regs; /* exception registers */
Msg_type _type;
void _parse_msg_type(void);
void _parse_exception(void);
void _parse_pagefault(void);
void _parse(unsigned long label);
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_thread t) {
_last = t; }
/**
* 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();
/**
* Reply to an exception IPC
*/
void acknowledge_exception();
/**
* Return thread ID of last faulter
*/
Native_thread last() const { return _last; }
/**
* Return badge for faulting thread
*/
unsigned long badge() { return _badge; }
bool is_write_fault() const { return (_pf_addr & 2); }
/**
* Return true if last fault was an exception
*/
bool is_exception() const
{
return _type == Ipc_pager::EXCEPTION;
}
/**
* Return the type of ipc we received at last.
*/
Msg_type msg_type() { return _type; };
/**
* Copy the exception registers from the last exception
* to the given Thread_state object.
*/
void get_regs(Thread_state *state);
/*
* Copy the exception reply registers from the given
* Thread_state object
*/
void set_regs(Thread_state state);
};
}
#endif /* _INCLUDE__BASE__IPC_PAGER_H_ */