73eb7a8d4b
Instead of mapping all physical memory 1:1 into core/kernel's address space, this commit limits the 1:1 mapping to the binary image, and I/O memory regions used by the kernel only. All subsequent memory accesses of core are done by mapping the corresponding memory on demand, and not necessarily 1:1. This commit has several side effects: The page table code had to be revisited completely. The kernel inserts no longer anything into the page tables, apart from the initial translations to have the core/kernel image available when enabling the MMU. The page tables and higher level translation tables are no longer named Tlb, but Translation_table instead. There is no indirection class required to define the translation tables of a concrete SoC, the appropriated ARM specifier is sufficient. The ability to map core's memory the same way like it's done for all other protection domains, makes a special treatment of core's threads (no context area) obsolete. Ref #567 (partly solves it) Fix #723 Fix #1068
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/*
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* \brief hw-specific implementation of core-local RM session
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* \author Norman Feske
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* \author Stefan Kalkowski
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* \date 2014-02-26
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*
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* Taken from OKL4-specific imlementation
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*/
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/*
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* Copyright (C) 2014 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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/* core includes */
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#include <platform.h>
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#include <core_rm_session.h>
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#include <map_local.h>
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#include <util.h>
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#include <base/heap.h>
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using namespace Genode;
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Rm_session::Local_addr
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Core_rm_session::attach(Dataspace_capability ds_cap, size_t size,
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off_t offset, bool use_local_addr,
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Rm_session::Local_addr, bool executable)
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{
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Object_pool<Dataspace_component>::Guard ds(_ds_ep->lookup_and_lock(ds_cap));
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if (!ds)
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throw Invalid_dataspace();
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if (size == 0)
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size = ds->size();
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size_t page_rounded_size = (size + get_page_size() - 1) & get_page_mask();
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if (use_local_addr) {
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PERR("Parameter 'use_local_addr' not supported within core");
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return 0;
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}
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if (offset) {
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PERR("Parameter 'offset' not supported within core");
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return 0;
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}
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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_aligned(page_rounded_size,
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&virt_addr,
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get_page_size_log2()).is_ok()) {
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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 false;
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}
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/* map the dataspace's physical pages to corresponding virtual addresses */
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unsigned 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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return 0;
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return virt_addr;
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}
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