66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/*
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* \brief Export and initialize RAM dataspace
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* \author Norman Feske
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* \date 2015-05-01
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*/
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/*
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* Copyright (C) 2015 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 General Public License version 2.
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*/
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/* Genode includes */
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#include <base/printf.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 <map_local.h>
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#include <untyped_memory.h>
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using namespace Genode;
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void Ram_session_component::_export_ram_ds(Dataspace_component *ds)
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{
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size_t const num_pages = ds->size() >> get_page_size_log2();
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Untyped_memory::convert_to_page_frames(ds->phys_addr(), num_pages);
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}
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void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds)
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{
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PDBG("not implemented");
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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 = (ds->size() + get_page_size() - 1) & get_page_mask();
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/* allocate range in core's virtual address space */
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void *virt_addr;
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if (!platform()->region_alloc()->alloc(page_rounded_size, &virt_addr)) {
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PERR("could not allocate virtual address range in core of size %zd\n",
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page_rounded_size);
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return;
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}
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/* map the dataspace's physical pages to core-local virtual addresses */
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size_t num_pages = page_rounded_size >> get_page_size_log2();
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map_local(ds->phys_addr(), (addr_t)virt_addr, num_pages);
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/* clear dataspace */
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size_t num_longwords = page_rounded_size/sizeof(long);
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for (long *dst = (long *)virt_addr; num_longwords--;)
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*dst++ = 0;
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/* unmap dataspace from core */
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unmap_local((addr_t)virt_addr, num_pages);
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/* free core's virtual address space */
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platform()->region_alloc()->free(virt_addr, page_rounded_size);
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}
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