67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/*
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* \brief Export RAM dataspace as shared memory object (dummy)
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* \author Norman Feske
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* \date 2006-07-03
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*
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* On L4, each dataspace _is_ a shared memory object.
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* Therefore, these functions are empty.
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*/
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/*
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* Copyright (C) 2006-2013 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/env.h>
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/* core includes */
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#include <platform.h>
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#include <map_local.h>
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#include <ram_session_component.h>
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/* OKL4 includes */
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namespace Okl4 { extern "C" {
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#include <l4/ipc.h> /* needed for 'L4_ErrorCode' */
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} }
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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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void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds) { }
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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 corresponding virtual addresses */
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size_t num_pages = page_rounded_size >> get_page_size_log2();
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if (!map_local(ds->phys_addr(), (addr_t)virt_addr, num_pages)) {
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PERR("core-local memory mapping failed, Error Code=%d\n", (int)Okl4::L4_ErrorCode());
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return;
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}
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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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if (!unmap_local((addr_t)virt_addr, num_pages))
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PERR("could not unmap core-local address range at %p (Error Code %ld)",
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virt_addr, Okl4::L4_ErrorCode());
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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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