genode/base-hw/include/base/ipc_pager.h
2013-09-26 15:58:03 +02:00

178 lines
3.7 KiB
C++

/*
* \brief IPC backend for a Genode pager
* \author Martin Stein
* \date 2012-03-28
*/
/*
* Copyright (C) 2012-2013 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/thread.h>
#include <base/ipc.h>
#include <base/native_types.h>
#include <kernel/log.h>
namespace Genode
{
class Pager_object;
/**
* Translation of a virtual page frame
*/
struct Mapping
{
addr_t virt_address;
addr_t phys_address;
bool write_combined;
bool io_mem;
unsigned size_log2;
bool writable;
/**
* Construct valid mapping
*/
Mapping(addr_t const va, addr_t const pa, bool const wc,
bool io, unsigned const sl2 = MIN_MAPPING_SIZE_LOG2,
bool const w = 1)
:
virt_address(va), phys_address(pa), write_combined(wc),
io_mem(io), size_log2(sl2), writable(w)
{ }
/**
* Construct invalid mapping
*/
Mapping() : size_log2(0) { }
/**
* Dummy, all data is available since construction
*/
void prepare_map_operation() { }
/**
* Validation
*/
bool valid() { return size_log2 > 0; }
};
/**
* Message format for the acknowledgment of a resolved pagefault
*/
struct Pagefault_resolved
{
Native_thread_id const reply_dst;
Pager_object * const pager_object;
};
/**
* Special paging server class
*/
class Ipc_pager : public Native_capability
{
enum { VERBOSE = 1 };
Pagefault _pagefault; /* data of lastly received pagefault */
Mapping _mapping; /* mapping to resolve last pagefault */
public:
/**
* Constructor
*/
Ipc_pager() :
Native_capability(Genode::thread_get_my_native_id(), 0)
{
/* check if we can distinguish all message types */
if (sizeof(Pagefault) == sizeof(Pagefault_resolved))
{
kernel_log() << __PRETTY_FUNCTION__
<< ": Message types indiscernible\n";
while (1) ;
}
}
/**
* Wait for the next pagefault request
*/
void wait_for_fault();
/**
* Resolve current pagefault and wait for a new one
*
* \retval 0 succeeded
* \retval !=0 failed
*/
int resolve_and_wait_for_fault();
/**
* Request instruction pointer of current page fault
*/
addr_t fault_ip() { return _pagefault.virt_ip; }
/**
* Request fault address of current page fault
*/
addr_t fault_addr() { return _pagefault.virt_address; }
/**
* Set parameters for next reply
*/
void set_reply_mapping(Mapping m) { _mapping = m; }
/**
* Set destination for next reply
*/
void set_reply_dst(Native_capability pager_object) {
kernel_log() << __PRETTY_FUNCTION__ << ": Not implemented\n";
while (1) ;
}
/**
* 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() {
kernel_log() << __PRETTY_FUNCTION__ << ": Not implemented\n";
while (1) ;
}
/**
* Return thread ID of last faulter
*/
Native_thread_id last() const { return _pagefault.thread_id; }
/**
* Return badge for faulting thread
*/
unsigned badge() const { return _pagefault.thread_id; }
/**
* Return true if last fault was a write fault
*/
bool is_write_fault() const { return _pagefault.write; }
/**
* Return true if last fault was an exception
*/
bool is_exception() const
{
kernel_log() << __PRETTY_FUNCTION__ << ": Not implemented\n";
while (1) ;
return false;
}
};
}
#endif /* _INCLUDE__BASE__IPC_PAGER_H_ */