4723b08322
'Page_flags' maps application-specific memory attributes to the TLB-specific memory attributes. Thereby it avoids functions with lots of parameters, by declaring appropriate bitfields on a single POD value.
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
/*
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* \brief RM- and pager implementations specific for base-hw and core
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* \author Martin Stein
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012 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/ipc_pager.h>
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/* core includes */
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#include <rm_session_component.h>
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#include <platform.h>
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#include <platform_thread.h>
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#include <assert.h>
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#include <tlb.h>
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using namespace Genode;
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/***************
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** Rm_client **
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***************/
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void Rm_client::unmap(addr_t core_local_base, addr_t virt_base, size_t size)
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{
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/* get software TLB of the thread that we serve */
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Platform_thread * const pt = Kernel::get_thread(badge());
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assert(pt);
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Tlb * const tlb = pt->tlb();
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assert(tlb);
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/* update all translation caches */
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tlb->remove_region(virt_base, size);
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Kernel::update_pd(pt->pd_id());
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/* try to regain administrative memory that has been freed by unmap */
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size_t s;
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void * base;
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while (tlb->regain_memory(base, s)) platform()->ram_alloc()->free(base, s);
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}
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/***************
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** Ipc_pager **
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***************/
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void Ipc_pager::resolve_and_wait_for_fault()
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{
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/* valid mapping? */
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assert(_mapping.valid());
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/* prepare mapping */
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Tlb * const tlb = _pagefault.tlb;
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page_flags_t const flags =
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Page_flags::resolve_and_wait_for_fault(_mapping.writable,
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_mapping.write_combined,
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_mapping.io_mem);
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/* insert mapping into TLB */
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unsigned sl2;
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sl2 = tlb->insert_translation(_mapping.virt_address, _mapping.phys_address,
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_mapping.size_log2, flags);
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if (sl2)
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{
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/* try to get some natural aligned space */
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void * space;
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assert(platform()->ram_alloc()->alloc_aligned(1<<sl2, &space, sl2));
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/* try to translate again with extra space */
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sl2 = tlb->insert_translation(_mapping.virt_address,
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_mapping.phys_address,
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_mapping.size_log2, flags, space);
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assert(!sl2);
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}
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/* try to wake up faulter */
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assert(!Kernel::resume_thread(_pagefault.thread_id));
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/* wait for next page fault */
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wait_for_fault();
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}
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