184 lines
4.3 KiB
C++
184 lines
4.3 KiB
C++
/*
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* \brief OKL4 pager support for Genode
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* \author Norman Feske
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* \date 2009-03-31
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*/
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/*
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* Copyright (C) 2009-2017 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 Affero General Public License version 3.
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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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#include <base/cache.h>
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#include <base/ipc.h>
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#include <base/stdint.h>
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/* base-internal includes */
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#include <base/internal/okl4.h>
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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 _phys_addr { 0 };
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Okl4::L4_Fpage_t _fpage { };
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Okl4::L4_PhysDesc_t _phys_desc { };
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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, bool rw, bool executable);
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/**
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* Construct invalid mapping
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*/
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Mapping();
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/**
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* Return flexpage describing the virtual destination address
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*/
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Okl4::L4_Fpage_t fpage() const { return _fpage; }
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/**
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* Return physical-memory descriptor describing the source location
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*/
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Okl4::L4_PhysDesc_t phys_desc() const { return _phys_desc; }
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/**
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* Prepare map operation
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*
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* On OKL4, we do not need to map a page core-locally to be able to
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* map it into another address space. Therefore, we can leave this
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* function blank.
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*/
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void prepare_map_operation() { }
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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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Okl4::L4_MsgTag_t _faulter_tag { 0 }; /* fault flags */
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Okl4::L4_ThreadId_t _last { 0 }; /* faulted thread */
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Okl4::L4_Word_t _last_space { 0 }; /* space of faulted thread */
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Okl4::L4_Word_t _fault_addr { 0 }; /* page-fault address */
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Okl4::L4_Word_t _fault_ip { 0 }; /* instruction pointer of faulter */
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Mapping _reply_mapping { }; /* page-fault answer */
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protected:
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/**
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* Wait for short-message (register) IPC -- fault
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*/
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void _wait();
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/**
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* Send short flex page and
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* wait for next short-message (register) IPC -- fault
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*/
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void _reply_and_wait();
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public:
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/**
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* Wait for a new 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 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 fault
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*/
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addr_t fault_ip() { return _fault_ip; }
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/**
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* Request fault address of current fault
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*/
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addr_t fault_addr() { return _fault_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() const
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{
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enum { CORE_SPACE = 0 };
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return _last_space == CORE_SPACE;
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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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* Because OKL4 has no server-defined badges for 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 { return _last.raw; }
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/**
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* Return true if last fault was a write fault
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*/
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bool write_fault() const { return L4_Label(_faulter_tag) & 2; }
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/**
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* Return true if last fault was a executable fault
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*/
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bool exec_fault() const { return false; }
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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 exception() const
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{
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/*
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* A page-fault message has one of the op bits (lower 3 bits of the
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* label) set. If those bits are zero, we got an exception message.
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* If the label is zero, we got an IPC wakeup message from within
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* core.
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*/
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return L4_Label(_faulter_tag) && (L4_Label(_faulter_tag) & 0xf) == 0;
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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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