155 lines
3.9 KiB
C++
155 lines
3.9 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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* \author Stefan Kalkowski
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* \date 2012-02-12
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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/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_pd.h>
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#include <platform_thread.h>
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#include <tlb.h>
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using namespace Genode;
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/**************************************
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** Helpers for processor broadcasts **
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**************************************/
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struct Update_pd_data { unsigned const pd_id; };
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void update_pd(void * const data)
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{
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auto const d = reinterpret_cast<Update_pd_data *>(data);
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Kernel::update_pd(d->pd_id);
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}
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/***************
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** Rm_client **
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***************/
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void Rm_client::unmap(addr_t, addr_t virt_base, size_t size)
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{
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/* remove mapping from the translation table of the thread that we serve */
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Platform_thread * const pt = (Platform_thread *)badge();
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if (!pt) {
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PWRN("failed to get platform thread of RM client");
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return;
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}
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Tlb * const tlb = pt->tlb();
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if (!tlb) {
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PWRN("failed to get page table of RM client");
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return;
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}
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tlb->remove_region(virt_base, size);
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/* update translation caches of all processors */
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Kernel::update_pd(pt->pd()->id());
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/* try to get back released memory from the translation table */
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regain_ram_from_tlb(tlb);
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}
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/***************************
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** Pager_activation_base **
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***************************/
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int Pager_activation_base::apply_mapping()
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{
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/* prepare mapping */
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Tlb * const tlb = (Tlb *)_fault.tlb;
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Page_flags const flags =
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Page_flags::apply_mapping(_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 RAM */
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void * ram;
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bool ram_ok = platform()->ram_alloc()->alloc_aligned(1<<sl2, &ram,
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sl2).is_ok();
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if (!ram_ok) {
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PWRN("failed to allocate additional RAM for TLB");
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return -1;
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}
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/* try to translate again with extra RAM */
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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, ram);
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if (sl2) {
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PWRN("TLB needs to much RAM");
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regain_ram_from_tlb(tlb);
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return -1;
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}
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}
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return 0;
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}
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void Pager_activation_base::entry()
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{
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/* get ready to receive faults */
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_cap = Native_capability(thread_get_my_native_id(), 0);
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_cap_valid.unlock();
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while (1)
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{
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/* await fault */
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Pager_object * o;
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while (1) {
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Signal s = Signal_receiver::wait_for_signal();
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o = dynamic_cast<Pager_object *>(s.context());
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if (o) {
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o->fault_occured(s);
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break;
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}
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PWRN("unknown pager object");
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}
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/* fetch fault data */
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Platform_thread * const pt = (Platform_thread *)o->badge();
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if (!pt) {
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PWRN("failed to get platform thread of faulter");
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continue;
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}
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unsigned const thread_id = pt->id();
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typedef Kernel::Thread_reg_id Reg_id;
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static addr_t const read_regs[] = {
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Reg_id::FAULT_TLB, Reg_id::IP, Reg_id::FAULT_ADDR,
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Reg_id::FAULT_WRITES, Reg_id::FAULT_SIGNAL };
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enum { READS = sizeof(read_regs)/sizeof(read_regs[0]) };
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void * const utcb = Thread_base::myself()->utcb()->base();
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memcpy(utcb, read_regs, sizeof(read_regs));
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addr_t * const values = (addr_t *)&_fault;
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if (Kernel::access_thread_regs(thread_id, READS, 0, values)) {
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PWRN("failed to read fault data");
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continue;
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}
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/* handle fault */
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if (o->pager(*this)) { continue; }
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if (apply_mapping()) {
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PWRN("failed to apply mapping");
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continue;
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}
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o->fault_resolved();
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}
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}
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