786fe805da
On ARM it's relevant to not only distinguish between ordinary cached memory and write-combined one, but also having non-cached memory too. To insert the appropriated page table entries e.g.: in the base-hw kernel, we need to preserve the information about the kind of memory from allocation until the pager resolves a page fault. Therefore, this commit introduces a new Cache_attribute type, and replaces the write_combined boolean with the new type where necessary.
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
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* \brief Export RAM dataspace as shared memory object (dummy)
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-02-12
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*
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* TODO: this file is almost identical to
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* base-okl4/src/core/ram_session_support.cc, we should merge them
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*/
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/*
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* Copyright (C) 2012-2013 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/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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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");
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return;
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}
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/* clear dataspace */
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memset(virt_addr, 0, page_rounded_size);
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/* uncached dataspaces need to be flushed */
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if (ds->cacheability() != CACHED)
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Kernel::update_data_region((addr_t)virt_addr, page_rounded_size);
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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", virt_addr);
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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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