77 lines
2.2 KiB
C++
77 lines
2.2 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) 2015-2017 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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/* core includes */
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#include <ram_dataspace_factory.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_dataspace_factory::_export_ram_ds(Dataspace_component &ds)
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{
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size_t const page_rounded_size = (ds.size() + get_page_size() - 1) & get_page_mask();
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size_t const num_pages = page_rounded_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_dataspace_factory::_revoke_ram_ds(Dataspace_component &ds)
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{
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size_t const page_rounded_size = (ds.size() + get_page_size() - 1) & get_page_mask();
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Untyped_memory::convert_to_untyped_frames(ds.phys_addr(), page_rounded_size);
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}
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void Ram_dataspace_factory::_clear_ds (Dataspace_component &ds)
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{
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size_t const page_rounded_size = (ds.size() + get_page_size() - 1) & get_page_mask();
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/* allocate one page in core's virtual address space */
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void *virt_addr_ptr = nullptr;
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if (!platform().region_alloc().alloc(get_page_size(), &virt_addr_ptr))
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ASSERT_NEVER_CALLED;
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if (!virt_addr_ptr)
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ASSERT_NEVER_CALLED;
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addr_t const virt_addr = reinterpret_cast<addr_t>(virt_addr_ptr);
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/* map each page of dataspace one at a time and clear it */
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for (addr_t offset = 0; offset < page_rounded_size; offset += get_page_size())
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{
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addr_t const phys_addr = ds.phys_addr() + offset;
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enum { ONE_PAGE = 1 };
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/* map one physical page to the core-local address */
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if (!map_local(phys_addr, virt_addr, ONE_PAGE)) {
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ASSERT(!"could not map 4k inside core");
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}
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/* clear one page */
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size_t num_longwords = get_page_size()/sizeof(long);
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for (long *dst = reinterpret_cast<long *>(virt_addr); num_longwords--;)
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*dst++ = 0;
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/* unmap cleared page from core */
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unmap_local(virt_addr, ONE_PAGE, nullptr, ds.cacheability() != CACHED);
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}
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/* free core's virtual address space */
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platform().region_alloc().free(virt_addr_ptr, get_page_size());
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}
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