2014-04-28 21:31:57 +02:00
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/*
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* \brief Short descriptor translation table definitions
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-02-22
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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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#ifndef _ARM__SHORT_TRANSLATION_TABLE_H_
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#define _ARM__SHORT_TRANSLATION_TABLE_H_
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/* Genode includes */
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#include <util/register.h>
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#include <base/printf.h>
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/* base-hw includes */
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#include <page_flags.h>
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#include <page_slab.h>
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namespace Arm
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{
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using namespace Genode;
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/**
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* Check if 'p' is aligned to 1 << 'alignm_log2'
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*/
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inline bool aligned(addr_t const a, size_t const alignm_log2) {
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return a == ((a >> alignm_log2) << alignm_log2); }
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/**
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* Return permission configuration according to given mapping flags
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*
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* \param T targeted translation-table-descriptor type
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* \param flags mapping flags
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*
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* \return descriptor value with AP and XN set and the rest left zero
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*/
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template <typename T>
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static typename T::access_t
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access_permission_bits(Page_flags const & flags)
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{
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typedef typename T::Xn Xn;
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typedef typename T::Ap Ap;
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typedef typename T::access_t access_t;
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bool const w = flags.writeable;
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bool const p = flags.privileged;
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access_t ap;
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if (w) { if (p) { ap = Ap::bits(0b001); }
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else { ap = Ap::bits(0b011); }
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} else { if (p) { ap = Ap::bits(0b101); }
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else { ap = Ap::bits(0b010); }
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}
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return Xn::bits(!flags.executable) | ap;
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}
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/**
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* Memory region attributes for the translation descriptor 'T'
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*/
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template <typename T>
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static typename T::access_t
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memory_region_attr(Page_flags const & flags);
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class Section_table;
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}
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/**
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* First level translation table
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*/
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class Arm::Section_table
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{
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public:
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/***************************
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** Exception definitions **
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***************************/
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class Double_insertion {};
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class Misaligned {};
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class Invalid_range {};
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private:
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/**
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* Second level translation table
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*/
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class Page_table
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{
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public:
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enum {
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SIZE_LOG2 = 10,
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SIZE = 1 << SIZE_LOG2,
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ALIGNM_LOG2 = SIZE_LOG2,
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};
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/**
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* Common descriptor structure
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*/
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struct Descriptor : Register<32>
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{
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/**
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* Descriptor types
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*/
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enum Type { FAULT, SMALL_PAGE };
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enum {
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VIRT_SIZE_LOG2 = 12,
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VIRT_SIZE = 1 << VIRT_SIZE_LOG2,
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VIRT_OFFSET_MASK = (1 << VIRT_SIZE_LOG2) - 1,
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VIRT_BASE_MASK = ~(VIRT_OFFSET_MASK),
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};
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struct Type_0 : Bitfield<0, 2> { };
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struct Type_1 : Bitfield<1, 1> { };
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/**
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* Get descriptor type of 'v'
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*/
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static Type type(access_t const v)
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{
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access_t const t0 = Type_0::get(v);
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if (t0 == 0) { return FAULT; }
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access_t const t1 = Type_1::get(v);
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if (t1 == 1) return SMALL_PAGE;
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return FAULT;
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}
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/**
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* Set descriptor type of 'v'
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*/
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static void type(access_t & v, Type const t)
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{
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switch (t) {
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case FAULT:
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Type_0::set(v, 0);
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return;
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case SMALL_PAGE:
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Type_1::set(v, 1);
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return;
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}
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}
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/**
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* Invalidate descriptor 'v'
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*/
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static void invalidate(access_t & v) { type(v, FAULT); }
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/**
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* Return if descriptor 'v' is valid
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*/
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static bool valid(access_t & v) {
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return type(v) != FAULT; }
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};
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/**
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* Small page descriptor structure
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*/
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struct Small_page : Descriptor
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{
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struct Xn : Bitfield<0, 1> { }; /* execute never */
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struct B : Bitfield<2, 1> { }; /* mem region attr. */
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struct C : Bitfield<3, 1> { }; /* mem region attr. */
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struct Ap_0 : Bitfield<4, 2> { }; /* access permission */
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struct Tex : Bitfield<6, 3> { }; /* mem region attr. */
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struct Ap_1 : Bitfield<9, 1> { }; /* access permission */
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struct S : Bitfield<10, 1> { }; /* shareable bit */
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struct Ng : Bitfield<11, 1> { }; /* not global bit */
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struct Pa : Bitfield<12, 20> { }; /* physical base */
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struct Ap : Bitset_2<Ap_0, Ap_1> { }; /* access permission */
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/**
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* Compose descriptor value
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*/
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static access_t create(Page_flags const & flags,
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addr_t const pa)
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{
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access_t v = access_permission_bits<Small_page>(flags);
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v |= memory_region_attr<Small_page>(flags);
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v |= Ng::bits(!flags.global);
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v |= S::bits(1);
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v |= Pa::masked(pa);
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Descriptor::type(v, Descriptor::SMALL_PAGE);
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return v;
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}
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};
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private:
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/*
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* Table payload
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*
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* Must be the only member of this class
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*/
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Descriptor::access_t _entries[SIZE/sizeof(Descriptor::access_t)];
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enum { MAX_INDEX = sizeof(_entries) / sizeof(_entries[0]) - 1 };
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/**
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* Get entry index by virtual offset
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*
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* \param i is overridden with the index if call returns 0
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* \param vo virtual offset relative to the virtual table base
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*
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* \retval 0 on success
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* \retval <0 translation failed
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*/
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bool _index_by_vo (unsigned & i, addr_t const vo) const
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{
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if (vo > max_virt_offset()) return false;
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i = vo >> Descriptor::VIRT_SIZE_LOG2;
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return true;
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}
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public:
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/**
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* Constructor
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*/
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Page_table()
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{
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if (!aligned((addr_t)this, ALIGNM_LOG2))
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throw Misaligned();
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/* start with an empty table */
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memset(&_entries, 0, sizeof(_entries));
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}
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/**
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* Maximum virtual offset that can be translated by this table
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*/
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static addr_t max_virt_offset()
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{
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return (MAX_INDEX << Descriptor::VIRT_SIZE_LOG2)
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+ (Descriptor::VIRT_SIZE - 1);
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}
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/**
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* Insert one atomic translation into this table
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*
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* \param vo offset of the virtual region represented
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* by the translation within the virtual
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* region represented by this table
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* \param pa base of the physical backing store
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* \param size size of the translated region
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* \param flags mapping flags
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*
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* This method overrides an existing translation in case
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* that it spans the the same virtual range otherwise it
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* throws a Double_insertion.
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*/
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void insert_translation(addr_t vo,
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addr_t pa,
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size_t size,
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Page_flags const & flags)
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{
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constexpr size_t sz = Descriptor::VIRT_SIZE;
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for (unsigned i; (size > 0) && _index_by_vo (i, vo);
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size = (size < sz) ? 0 : size - sz, vo += sz, pa += sz) {
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if (Descriptor::valid(_entries[i]) &&
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_entries[i] != Small_page::create(flags, pa))
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throw Double_insertion();
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/* compose new descriptor value */
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_entries[i] = Small_page::create(flags, pa);
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}
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}
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/**
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* Remove translations that overlap with a given virtual region
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*
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* \param vo region offset within the tables virtual region
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* \param size region size
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*/
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void remove_translation(addr_t vo, size_t size)
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{
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constexpr size_t sz = Descriptor::VIRT_SIZE;
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for (unsigned i; (size > 0) && _index_by_vo(i, vo);
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size = (size < sz) ? 0 : size - sz, vo += sz) {
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switch (Descriptor::type(_entries[i])) {
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case Descriptor::SMALL_PAGE:
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{
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Descriptor::invalidate(_entries[i]);
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}
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default: ;
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}
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}
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}
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/**
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* Does this table solely contain invalid entries
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*/
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bool empty()
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{
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for (unsigned i = 0; i <= MAX_INDEX; i++)
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if (Descriptor::valid(_entries[i])) return false;
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return true;
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}
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} __attribute__((aligned(1<<Page_table::ALIGNM_LOG2)));
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enum { DOMAIN = 0 };
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public:
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enum {
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SIZE_LOG2 = 14,
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SIZE = 1 << SIZE_LOG2,
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ALIGNM_LOG2 = SIZE_LOG2,
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MAX_COSTS_PER_TRANSLATION = sizeof(Page_table),
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MAX_PAGE_SIZE_LOG2 = 20,
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MIN_PAGE_SIZE_LOG2 = 12,
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};
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/**
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* A first level translation descriptor
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*/
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struct Descriptor : Register<32>
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{
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/**
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* Descriptor types
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*/
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enum Type { FAULT, PAGE_TABLE, SECTION };
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enum {
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VIRT_SIZE_LOG2 = 20,
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VIRT_SIZE = 1 << VIRT_SIZE_LOG2,
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VIRT_OFFSET_MASK = (1 << VIRT_SIZE_LOG2) - 1,
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VIRT_BASE_MASK = ~VIRT_OFFSET_MASK,
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};
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struct Type_0 : Bitfield<0, 2> { };
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struct Type_1_0 : Bitfield<1, 1> { };
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struct Type_1_1 : Bitfield<18, 1> { };
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struct Type_1 : Bitset_2<Type_1_0, Type_1_1> { };
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/**
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* Get descriptor type of 'v'
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*/
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static Type type(access_t const v)
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{
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switch (Type_0::get(v)) {
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case 0: return FAULT;
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case 1: return PAGE_TABLE;
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}
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switch (Type_1::get(v)) {
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case 1: return SECTION;
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}
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return FAULT;
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}
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/**
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* Set descriptor type of 'v'
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*/
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static void type(access_t & v, Type const t)
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{
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switch (t) {
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case FAULT:
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Type_0::set(v, 0);
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return;
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case PAGE_TABLE:
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Type_0::set(v, 1);
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return;
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case SECTION:
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Type_1::set(v, 1);
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return;
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}
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}
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/**
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* Invalidate descriptor 'v'
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*/
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static void invalidate(access_t & v) { type(v, FAULT); }
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/**
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* Return if descriptor 'v' is valid
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*/
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static bool valid(access_t & v) { return type(v) != FAULT; }
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2014-05-28 11:44:44 +02:00
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static inline Type align(addr_t vo, addr_t pa, size_t size)
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2014-04-28 21:31:57 +02:00
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{
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2014-05-28 11:44:44 +02:00
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return ((vo & VIRT_OFFSET_MASK) || (pa & VIRT_OFFSET_MASK) ||
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size < VIRT_SIZE) ? PAGE_TABLE : SECTION;
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2014-04-28 21:31:57 +02:00
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}
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};
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/**
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* Link to a second level translation table
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*/
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struct Page_table_descriptor : Descriptor
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{
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struct Domain : Bitfield<5, 4> { }; /* domain */
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struct Pa : Bitfield<10, 22> { }; /* physical base */
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/**
|
|
|
|
* Compose descriptor value
|
|
|
|
*/
|
|
|
|
static access_t create(Page_table * const pt)
|
|
|
|
{
|
|
|
|
access_t v = Domain::bits(DOMAIN) |
|
|
|
|
Pa::masked((addr_t)pt);
|
|
|
|
Descriptor::type(v, Descriptor::PAGE_TABLE);
|
|
|
|
return v;
|
|
|
|
}
|
|
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|
};
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|
|
|
/**
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|
|
|
* Section translation descriptor
|
|
|
|
*/
|
|
|
|
struct Section : Descriptor
|
|
|
|
{
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|
|
|
struct B : Bitfield<2, 1> { }; /* mem. region attr. */
|
|
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|
struct C : Bitfield<3, 1> { }; /* mem. region attr. */
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|
struct Xn : Bitfield<4, 1> { }; /* execute never bit */
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|
|
struct Domain : Bitfield<5, 4> { }; /* domain */
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|
struct Ap_0 : Bitfield<10, 2> { }; /* access permission */
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|
|
struct Tex : Bitfield<12, 3> { }; /* mem. region attr. */
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|
|
struct Ap_1 : Bitfield<15, 1> { }; /* access permission */
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|
|
struct S : Bitfield<16, 1> { }; /* shared */
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|
|
struct Ng : Bitfield<17, 1> { }; /* not global */
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|
|
struct Pa : Bitfield<20, 12> { }; /* physical base */
|
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|
|
struct Ap : Bitset_2<Ap_0, Ap_1> { }; /* access permission */
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|
|
|
|
|
|
/**
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|
|
* Compose descriptor value
|
|
|
|
*/
|
|
|
|
static access_t create(Page_flags const & flags,
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|
|
|
addr_t const pa)
|
|
|
|
{
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|
|
|
access_t v = access_permission_bits<Section>(flags);
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|
|
v |= memory_region_attr<Section>(flags);
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|
|
v |= Domain::bits(DOMAIN);
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|
|
v |= S::bits(1);
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|
|
v |= Ng::bits(!flags.global);
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|
|
v |= Pa::masked(pa);
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|
|
Descriptor::type(v, Descriptor::SECTION);
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|
return v;
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|
}
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|
|
};
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|
protected:
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|
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|
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|
|
/* table payload, must be the first member of this class */
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|
|
Descriptor::access_t _entries[SIZE/sizeof(Descriptor::access_t)];
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|
enum { MAX_INDEX = sizeof(_entries) / sizeof(_entries[0]) - 1 };
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|
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|
|
/**
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|
|
* Get entry index by virtual offset
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|
|
*
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|
|
* \param i is overridden with the resulting index
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|
|
* \param vo offset within the virtual region represented
|
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|
|
* by this table
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|
|
*
|
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|
|
* \retval 0 on success
|
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|
|
* \retval <0 if virtual offset couldn't be resolved,
|
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|
|
* in this case 'i' reside invalid
|
|
|
|
*/
|
|
|
|
bool _index_by_vo(unsigned & i, addr_t const vo) const
|
|
|
|
{
|
|
|
|
if (vo > max_virt_offset()) return false;
|
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|
|
i = vo >> Descriptor::VIRT_SIZE_LOG2;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Insert a second level translation at the given entry index
|
|
|
|
*
|
|
|
|
* \param i the related index
|
|
|
|
* \param vo virtual start address of range
|
|
|
|
* \param pa physical start address of range
|
|
|
|
* \param size size of range
|
|
|
|
* \param flags mapping flags
|
|
|
|
* \param slab second level page slab allocator
|
|
|
|
*/
|
|
|
|
void _insert_second_level(unsigned i,
|
|
|
|
addr_t const vo,
|
|
|
|
addr_t const pa,
|
|
|
|
size_t const size,
|
|
|
|
Page_flags const & flags,
|
|
|
|
Page_slab * slab)
|
|
|
|
{
|
|
|
|
Page_table * pt = 0;
|
|
|
|
switch (Descriptor::type(_entries[i])) {
|
|
|
|
|
|
|
|
case Descriptor::FAULT:
|
|
|
|
{
|
|
|
|
if (!slab) throw Allocator::Out_of_memory();
|
|
|
|
|
|
|
|
/* create and link page table */
|
|
|
|
pt = new (slab) Page_table();
|
|
|
|
Page_table * pt_phys = (Page_table*) slab->phys_addr(pt);
|
|
|
|
pt_phys = pt_phys ? pt_phys : pt; /* hack for core */
|
|
|
|
_entries[i] = Page_table_descriptor::create(pt_phys);
|
|
|
|
}
|
|
|
|
|
|
|
|
case Descriptor::PAGE_TABLE:
|
|
|
|
{
|
|
|
|
/* use allocator to retrieve virtual address of page table */
|
|
|
|
void * pt_phys = (void*)
|
|
|
|
Page_table_descriptor::Pa::masked(_entries[i]);
|
|
|
|
pt = (Page_table *) slab->virt_addr(pt_phys);
|
|
|
|
pt = pt ? pt : (Page_table *)pt_phys ; /* hack for core */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
default:
|
|
|
|
{
|
|
|
|
throw Double_insertion();
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* insert translation */
|
|
|
|
pt->insert_translation(vo - Section::Pa::masked(vo),
|
|
|
|
pa, size, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
public:
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Placement new
|
|
|
|
*/
|
|
|
|
void * operator new (size_t, void * p) { return p; }
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Constructor
|
|
|
|
*/
|
|
|
|
Section_table()
|
|
|
|
{
|
|
|
|
if (!aligned((addr_t)this, ALIGNM_LOG2))
|
|
|
|
throw Misaligned();
|
|
|
|
|
|
|
|
/* start with an empty table */
|
|
|
|
memset(&_entries, 0, sizeof(_entries));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Maximum virtual offset that can be translated by this table
|
|
|
|
*/
|
|
|
|
static addr_t max_virt_offset()
|
|
|
|
{
|
|
|
|
return (MAX_INDEX << Descriptor::VIRT_SIZE_LOG2)
|
|
|
|
+ (Descriptor::VIRT_SIZE - 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Insert translations into this table
|
|
|
|
*
|
|
|
|
* \param vo offset of the virtual region represented
|
|
|
|
* by the translation within the virtual
|
|
|
|
* region represented by this table
|
|
|
|
* \param pa base of the physical backing store
|
|
|
|
* \param size size of the translated region
|
|
|
|
* \param flags mapping flags
|
|
|
|
* \param slab second level page slab allocator
|
|
|
|
*/
|
|
|
|
void insert_translation(addr_t vo,
|
|
|
|
addr_t pa,
|
|
|
|
size_t size,
|
|
|
|
Page_flags const & flags,
|
|
|
|
Page_slab * slab)
|
|
|
|
{
|
|
|
|
/* sanity check */
|
|
|
|
if ((vo & Page_table::Descriptor::VIRT_OFFSET_MASK)
|
|
|
|
|| size < Page_table::Descriptor::VIRT_SIZE)
|
|
|
|
throw Invalid_range();
|
|
|
|
|
|
|
|
for (unsigned i; (size > 0) && _index_by_vo (i, vo);) {
|
|
|
|
|
|
|
|
addr_t end = (vo + Descriptor::VIRT_SIZE)
|
|
|
|
& Descriptor::VIRT_BASE_MASK;
|
|
|
|
|
|
|
|
/* decide granularity of entry that can be inserted */
|
2014-05-28 11:44:44 +02:00
|
|
|
switch (Descriptor::align(vo, pa, size)) {
|
2014-04-28 21:31:57 +02:00
|
|
|
|
|
|
|
case Descriptor::SECTION:
|
|
|
|
{
|
|
|
|
if (Descriptor::valid(_entries[i]) &&
|
|
|
|
_entries[i] != Section::create(flags, pa))
|
|
|
|
throw Double_insertion();
|
|
|
|
_entries[i] = Section::create(flags, pa);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
default:
|
|
|
|
{
|
|
|
|
_insert_second_level(i, vo, pa, min(size, end-vo), flags, slab);
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* check whether we wrap */
|
|
|
|
if (end < vo) return;
|
|
|
|
|
|
|
|
size_t sz = end - vo;
|
|
|
|
size = (size > sz) ? size - sz : 0;
|
|
|
|
vo += sz;
|
|
|
|
pa += sz;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Remove translations that overlap with a given virtual region
|
|
|
|
*
|
|
|
|
* \param vo region offset within the tables virtual region
|
|
|
|
* \param size region size
|
|
|
|
* \param slab second level page slab allocator
|
|
|
|
*/
|
|
|
|
void remove_translation(addr_t vo, size_t size, Page_slab * slab)
|
|
|
|
{
|
|
|
|
if (vo > (vo + size)) throw Invalid_range();
|
|
|
|
|
|
|
|
for (unsigned i; (size > 0) && _index_by_vo(i, vo);) {
|
|
|
|
|
|
|
|
addr_t end = (vo + Descriptor::VIRT_SIZE)
|
|
|
|
& Descriptor::VIRT_BASE_MASK;
|
|
|
|
|
|
|
|
switch (Descriptor::type(_entries[i])) {
|
|
|
|
|
|
|
|
case Descriptor::PAGE_TABLE:
|
|
|
|
{
|
|
|
|
typedef Page_table_descriptor Ptd;
|
|
|
|
typedef Page_table Pt;
|
|
|
|
|
|
|
|
Pt * pt_phys = (Pt *) Ptd::Pa::masked(_entries[i]);
|
|
|
|
Pt * pt = (Pt *) slab->virt_addr(pt_phys);
|
|
|
|
pt = pt ? pt : pt_phys; // TODO hack for core
|
|
|
|
|
|
|
|
addr_t const pt_vo = vo - Section::Pa::masked(vo);
|
|
|
|
pt->remove_translation(pt_vo, min(size, end-vo));
|
|
|
|
|
|
|
|
if (pt->empty()) {
|
|
|
|
Descriptor::invalidate(_entries[i]);
|
|
|
|
destroy(slab, pt);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
default:
|
|
|
|
{
|
|
|
|
Descriptor::invalidate(_entries[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* check whether we wrap */
|
|
|
|
if (end < vo) return;
|
|
|
|
|
|
|
|
size_t sz = end - vo;
|
|
|
|
size = (size > sz) ? size - sz : 0;
|
|
|
|
vo += sz;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} __attribute__((aligned(1<<Section_table::ALIGNM_LOG2)));
|
|
|
|
|
|
|
|
namespace Genode { using Translation_table = Arm::Section_table; }
|
|
|
|
|
|
|
|
#endif /* _ARM__SHORT_TRANSLATION_TABLE_H_ */
|
|
|
|
|