2011-12-22 16:19:25 +01:00
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/*
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* \brief Export RAM dataspace as shared memory object
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* \author Norman Feske
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* \date 2009-10-02
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*/
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/*
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2017-02-20 13:23:52 +01:00
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* Copyright (C) 2009-2017 Genode Labs GmbH
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2011-12-22 16:19:25 +01:00
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*
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* This file is part of the Genode OS framework, which is distributed
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2017-02-20 13:23:52 +01:00
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* under the terms of the GNU Affero General Public License version 3.
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2011-12-22 16:19:25 +01:00
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*/
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/* Genode includes */
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#include <base/thread.h>
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/* core includes */
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2017-05-11 15:03:03 +02:00
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#include <ram_dataspace_factory.h>
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2011-12-22 16:19:25 +01:00
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#include <platform.h>
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#include <util.h>
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#include <nova_util.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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using namespace Genode;
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2013-01-11 23:10:21 +01:00
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Follow practices suggested by "Effective C++"
The patch adjust the code of the base, base-<kernel>, and os repository.
To adapt existing components to fix violations of the best practices
suggested by "Effective C++" as reported by the -Weffc++ compiler
argument. The changes follow the patterns outlined below:
* A class with virtual functions can no longer publicly inherit base
classed without a vtable. The inherited object may either be moved
to a member variable, or inherited privately. The latter would be
used for classes that inherit 'List::Element' or 'Avl_node'. In order
to enable the 'List' and 'Avl_tree' to access the meta data, the
'List' must become a friend.
* Instead of adding a virtual destructor to abstract base classes,
we inherit the new 'Interface' class, which contains a virtual
destructor. This way, single-line abstract base classes can stay
as compact as they are now. The 'Interface' utility resides in
base/include/util/interface.h.
* With the new warnings enabled, all member variables must be explicitly
initialized. Basic types may be initialized with '='. All other types
are initialized with braces '{ ... }' or as class initializers. If
basic types and non-basic types appear in a row, it is nice to only
use the brace syntax (also for basic types) and align the braces.
* If a class contains pointers as members, it must now also provide a
copy constructor and assignment operator. In the most cases, one
would make them private, effectively disallowing the objects to be
copied. Unfortunately, this warning cannot be fixed be inheriting
our existing 'Noncopyable' class (the compiler fails to detect that
the inheriting class cannot be copied and still gives the error).
For now, we have to manually add declarations for both the copy
constructor and assignment operator as private class members. Those
declarations should be prepended with a comment like this:
/*
* Noncopyable
*/
Thread(Thread const &);
Thread &operator = (Thread const &);
In the future, we should revisit these places and try to replace
the pointers with references. In the presence of at least one
reference member, the compiler would no longer implicitly generate
a copy constructor. So we could remove the manual declaration.
Issue #465
2017-12-21 15:42:15 +01:00
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void Ram_dataspace_factory::_revoke_ram_ds(Dataspace_component *) { }
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2011-12-22 16:19:25 +01:00
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2013-01-11 23:10:21 +01:00
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2013-12-20 10:41:37 +01:00
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static inline void * alloc_region(Dataspace_component *ds, const size_t size)
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2011-12-22 16:19:25 +01:00
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{
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/*
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* Allocate range in core's virtual address space
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*
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* Start with trying to use natural alignment. If this does not work,
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* successively weaken the alignment constraint until we hit the page size.
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*/
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2013-12-20 10:41:37 +01:00
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void *virt_addr = 0;
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2011-12-22 16:19:25 +01:00
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size_t align_log2 = log2(ds->size());
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for (; align_log2 >= get_page_size_log2(); align_log2--) {
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2013-12-20 10:41:37 +01:00
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if (platform()->region_alloc()->alloc_aligned(size,
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2016-05-11 18:21:47 +02:00
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&virt_addr, align_log2).ok())
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2011-12-22 16:19:25 +01:00
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break;
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}
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2013-12-20 10:41:37 +01:00
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return virt_addr;
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}
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2017-05-11 15:03:03 +02:00
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void Ram_dataspace_factory::_clear_ds(Dataspace_component *ds)
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2013-12-20 10:41:37 +01:00
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{
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2015-09-29 22:03:03 +02:00
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size_t page_rounded_size = align_addr(ds->size(), get_page_size_log2());
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2015-10-14 11:05:03 +02:00
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size_t memset_count = page_rounded_size / 4;
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addr_t memset_ptr = ds->core_local_addr();
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if ((memset_count * 4 == page_rounded_size) && !(memset_ptr & 0x3))
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asm volatile ("rep stosl" : "+D" (memset_ptr), "+c" (memset_count)
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: "a" (0) : "memory");
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else
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memset(reinterpret_cast<void *>(memset_ptr), 0, page_rounded_size);
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2015-09-29 22:03:03 +02:00
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/* we don't keep any core-local mapping */
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2016-05-04 12:27:17 +02:00
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unmap_local(reinterpret_cast<Nova::Utcb *>(Thread::myself()->utcb()),
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2015-09-29 22:03:03 +02:00
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ds->core_local_addr(),
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page_rounded_size >> get_page_size_log2());
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platform()->region_alloc()->free((void*)ds->core_local_addr(),
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page_rounded_size);
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ds->assign_core_local_addr(nullptr);
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2013-12-20 10:41:37 +01:00
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}
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2017-05-11 15:03:03 +02:00
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void Ram_dataspace_factory::_export_ram_ds(Dataspace_component *ds) {
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2013-12-20 10:41:37 +01:00
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2015-09-29 22:03:03 +02:00
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size_t page_rounded_size = align_addr(ds->size(), get_page_size_log2());
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2013-12-20 10:41:37 +01:00
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/* allocate the virtual region contiguous for the dataspace */
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void * virt_ptr = alloc_region(ds, page_rounded_size);
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if (!virt_ptr)
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2017-05-08 19:55:54 +02:00
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throw Core_virtual_memory_exhausted();
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2013-12-20 10:41:37 +01:00
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2015-09-29 22:03:03 +02:00
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/* map it writeable for _clear_ds */
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2016-05-04 12:27:17 +02:00
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Nova::Utcb * const utcb = reinterpret_cast<Nova::Utcb *>(Thread::myself()->utcb());
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2015-09-29 22:03:03 +02:00
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const Nova::Rights rights_rw(true, true, false);
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2013-12-20 10:41:37 +01:00
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if (map_local(utcb, ds->phys_addr(), reinterpret_cast<addr_t>(virt_ptr),
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2015-09-29 22:03:03 +02:00
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page_rounded_size >> get_page_size_log2(), rights_rw, true)) {
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2013-12-20 10:41:37 +01:00
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platform()->region_alloc()->free(virt_ptr, page_rounded_size);
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2017-05-08 19:55:54 +02:00
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throw Core_virtual_memory_exhausted();
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2013-01-25 16:30:09 +01:00
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}
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2011-12-22 16:19:25 +01:00
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2015-09-29 22:03:03 +02:00
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/* assign virtual address to the dataspace to be used by clear_ds */
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2013-12-20 10:41:37 +01:00
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ds->assign_core_local_addr(virt_ptr);
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2011-12-22 16:19:25 +01:00
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}
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