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Diffstat (limited to 'qtmips_machine/physaddrspace.cpp')
-rw-r--r-- | qtmips_machine/physaddrspace.cpp | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/qtmips_machine/physaddrspace.cpp b/qtmips_machine/physaddrspace.cpp new file mode 100644 index 0000000..1c96d55 --- /dev/null +++ b/qtmips_machine/physaddrspace.cpp @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0+ +/******************************************************************************* + * QtMips - MIPS 32-bit Architecture Subset Simulator + * + * Implemented to support following courses: + * + * B35APO - Computer Architectures + * https://cw.fel.cvut.cz/wiki/courses/b35apo + * + * B4M35PAP - Advanced Computer Architectures + * https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start + * + * Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz> + * Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz> + * + * Faculty of Electrical Engineering (http://www.fel.cvut.cz) + * Czech Technical University (http://www.cvut.cz/) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + ******************************************************************************/ + +#include "physaddrspace.h" + +using namespace machine; + +PhysAddrSpace::PhysAddrSpace() { + +} + +PhysAddrSpace::~PhysAddrSpace() { + while (!ranges_by_access.isEmpty()) { + RangeDesc *p_range = ranges_by_access.first(); + ranges_by_addr.remove(p_range->last_addr); + ranges_by_access.remove(p_range->mem_acces); + if (p_range->owned) + delete p_range->mem_acces; + delete p_range; + } +} + +bool PhysAddrSpace::wword(std::uint32_t address, std::uint32_t value) { + RangeDesc *p_range = find_range(address); + if (p_range == nullptr) + return false; + return p_range->mem_acces->write_word(address - p_range->start_addr, value); +} + +std::uint32_t PhysAddrSpace::rword(std::uint32_t address) const { + const RangeDesc *p_range = find_range(address); + if (p_range == nullptr) + return 0x00000000; + return p_range->mem_acces->read_word(address - p_range->start_addr); +} + +PhysAddrSpace::RangeDesc *PhysAddrSpace::find_range(std::uint32_t address) const { + PhysAddrSpace::RangeDesc *p_range; + auto i = ranges_by_addr.lowerBound(address); + if (i == ranges_by_addr.end()) + return nullptr; + p_range = i.value(); + if (address >= p_range->start_addr && address <= p_range->last_addr) + return p_range; + return nullptr; +} + +bool PhysAddrSpace::insert_range(MemoryAccess *mem_acces, std::uint32_t start_addr, std::uint32_t last_addr, bool move_ownership) { + RangeDesc *p_range = new RangeDesc(mem_acces, start_addr, last_addr, move_ownership); + auto i = ranges_by_addr.lowerBound(start_addr); + if (i != ranges_by_addr.end()) { + if (i.value()->start_addr <= last_addr && i.value()->last_addr >= start_addr) + return false; + } + ranges_by_addr.insert(last_addr, p_range); + ranges_by_access.insert(mem_acces, p_range); + return true; +} + +bool PhysAddrSpace::remove_range(MemoryAccess *mem_acces) { + RangeDesc *p_range = ranges_by_access.take(mem_acces); + if (p_range == nullptr) + return false; + ranges_by_addr.remove(p_range->last_addr); + if (p_range->owned) + delete p_range->mem_acces; + delete p_range; + return true; +} + +void PhysAddrSpace::clean_range(std::uint32_t start_addr, std::uint32_t last_addr) { + auto i = ranges_by_addr.lowerBound(start_addr); + while (i != ranges_by_addr.end()) { + RangeDesc *p_range = i.value(); + i++; + if (p_range->start_addr <= last_addr) + remove_range(p_range->mem_acces); + else + break; + } +} + +PhysAddrSpace::RangeDesc::RangeDesc(MemoryAccess *mem_acces, std::uint32_t start_addr, std::uint32_t last_addr, bool owned) { + this->mem_acces = mem_acces; + this->start_addr = start_addr; + this->last_addr = last_addr; + this->owned = owned; +} + |