e44f65f3b2
This patch reworks the implementation of core's RAM service to make use of the 'Session_object' and to remove the distinction between the "metadata" quota and the managed RAM quota. With the new implementation, the session implicitly allocates its metadata from its own account. So there is not need to handle 'Out_of_metadata' and 'Quota_exceeded' via different exceptions. Instead, the new version solely uses the 'Out_of_ram' exception. Furthermore, the 'Allocator::Out_of_memory' exception has become an alias for 'Out_of_ram', which simplifies the error handling. Issue #2398
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
/*
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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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* 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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/* Genode includes */
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#include <base/thread.h>
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/* core includes */
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#include <ram_session_component.h>
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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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void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds) { }
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static inline void * alloc_region(Dataspace_component *ds, const size_t size)
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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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void *virt_addr = 0;
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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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if (platform()->region_alloc()->alloc_aligned(size,
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&virt_addr, align_log2).ok())
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break;
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}
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return virt_addr;
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}
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void Ram_session_component::_clear_ds(Dataspace_component *ds)
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{
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size_t page_rounded_size = align_addr(ds->size(), get_page_size_log2());
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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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/* we don't keep any core-local mapping */
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unmap_local(reinterpret_cast<Nova::Utcb *>(Thread::myself()->utcb()),
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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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}
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void Ram_session_component::_export_ram_ds(Dataspace_component *ds) {
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size_t page_rounded_size = align_addr(ds->size(), get_page_size_log2());
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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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throw Core_virtual_memory_exhausted();
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/* map it writeable for _clear_ds */
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Nova::Utcb * const utcb = reinterpret_cast<Nova::Utcb *>(Thread::myself()->utcb());
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const Nova::Rights rights_rw(true, true, false);
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if (map_local(utcb, ds->phys_addr(), reinterpret_cast<addr_t>(virt_ptr),
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page_rounded_size >> get_page_size_log2(), rights_rw, true)) {
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platform()->region_alloc()->free(virt_ptr, page_rounded_size);
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throw Core_virtual_memory_exhausted();
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}
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/* assign virtual address to the dataspace to be used by clear_ds */
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ds->assign_core_local_addr(virt_ptr);
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}
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