109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
/*
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* \brief Kernel backend for protection domains
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-11-30
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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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/* core includes */
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#include <kernel/pd.h>
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#include <util.h>
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/* Genode includes */
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#include <assert.h>
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#include <page_flags.h>
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/* base-internal includes */
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#include <base/internal/unmanaged_singleton.h>
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using namespace Kernel;
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/* structure of the mode transition */
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extern int _mt_begin;
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extern int _mt_end;
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extern int _mt_user_entry_pic;
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extern Genode::addr_t _mt_client_context_ptr;
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extern Genode::addr_t _mt_master_context_begin;
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extern Genode::addr_t _mt_master_context_end;
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size_t Mode_transition_control::_size() {
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return (addr_t)&_mt_end - (addr_t)&_mt_begin; }
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size_t Mode_transition_control::_master_context_size()
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{
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addr_t const begin = (addr_t)&_mt_master_context_begin;
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addr_t const end = (addr_t)&_mt_master_context_end;
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return end - begin;
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}
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addr_t Mode_transition_control::_virt_user_entry()
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{
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addr_t const phys = (addr_t)&_mt_user_entry_pic;
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addr_t const phys_base = (addr_t)&_mt_begin;
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return VIRT_BASE + (phys - phys_base);
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}
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void Mode_transition_control::map(Genode::Translation_table * tt,
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Genode::Translation_table_allocator * alloc)
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{
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try {
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addr_t const phys_base = (addr_t)&_mt_begin;
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tt->insert_translation(Genode::trunc_page(VIRT_BASE), phys_base, SIZE,
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Genode::Page_flags::mode_transition(), alloc);
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} catch(...) {
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PERR("Inserting exception vector in page table failed!"); }
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}
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void Mode_transition_control::switch_to(Cpu::Context * const context,
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unsigned const cpu,
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addr_t const entry_raw,
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addr_t const context_ptr_base)
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{
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/* override client-context pointer of the executing CPU */
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size_t const context_ptr_offset = cpu * sizeof(context);
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addr_t const context_ptr = context_ptr_base + context_ptr_offset;
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*(void * *)context_ptr = context;
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/* call assembly code that applies the virtual-machine context */
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typedef void (* Entry)();
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Entry __attribute__((noreturn)) const entry = (Entry)entry_raw;
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entry();
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}
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void Mode_transition_control::switch_to_user(Cpu::Context * const context,
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unsigned const cpu)
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{
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switch_to(context, cpu, _virt_user_entry(),
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(addr_t)&_mt_client_context_ptr);
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}
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Mode_transition_control::Mode_transition_control() : _master(&_table)
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{
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assert(Genode::aligned(this, ALIGN_LOG2));
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assert(sizeof(_master) <= _master_context_size());
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assert(_size() <= SIZE);
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map(&_table, _alloc.alloc());
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Genode::memcpy(&_mt_master_context_begin, &_master, sizeof(_master));
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}
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Mode_transition_control * Kernel::mtc()
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{
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typedef Mode_transition_control Control;
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return unmanaged_singleton<Control, Control::ALIGN>();
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}
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