106 lines
3.7 KiB
C++
106 lines
3.7 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-24 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef MEMORY_CONTROLLER_BASE_H
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#define MEMORY_CONTROLLER_BASE_H
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#include <cinttypes>
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#include <string>
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#include <vector>
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class MMIODevice;
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/* Common DRAM capacities. */
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enum {
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DRAM_CAP_1MB = (1 << 20),
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DRAM_CAP_2MB = (1 << 21),
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DRAM_CAP_4MB = (1 << 22),
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DRAM_CAP_8MB = (1 << 23),
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DRAM_CAP_16MB = (1 << 24),
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DRAM_CAP_32MB = (1 << 25),
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DRAM_CAP_64MB = (1 << 26),
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DRAM_CAP_128MB = (1 << 27),
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};
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enum RangeType {
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RT_ROM = 1, // read-only memory
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RT_RAM = 2, // random access memory
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RT_MMIO = 4, // memory mapped I/O
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RT_MIRROR = 8 // region mirror (content of another region acessible at some
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// other address)
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};
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/** Defines the format for the address map entry. */
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typedef struct AddressMapEntry {
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uint32_t start; // first address of the corresponding range
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uint32_t end; // last address of the corresponding range
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uint32_t mirror; // starting address of the origin for RT_MIRROR
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uint32_t type; // range type
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MMIODevice* devobj; // pointer to device object
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unsigned char* mem_ptr; // direct pointer to data for memory objects
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} AddressMapEntry;
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/** Base class for memory controllers. */
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class MemCtrlBase {
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public:
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MemCtrlBase() = default;
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virtual ~MemCtrlBase();
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virtual bool add_rom_region(uint32_t start_addr, uint32_t size);
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virtual bool add_ram_region(uint32_t start_addr, uint32_t size);
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virtual bool add_mem_mirror(uint32_t start_addr, uint32_t dest_addr);
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virtual bool add_mem_mirror_partial(uint32_t start_addr, uint32_t dest_addr,
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uint32_t offset, uint32_t size);
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virtual bool add_mmio_region(uint32_t start_addr, uint32_t size,
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MMIODevice* dev_instance);
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virtual bool remove_mmio_region(uint32_t start_addr, uint32_t size,
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MMIODevice* dev_instance);
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virtual bool set_data(uint32_t reg_addr, const uint8_t* data, uint32_t size);
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AddressMapEntry* find_range(uint32_t addr);
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AddressMapEntry* find_range_exact(uint32_t addr, uint32_t size,
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MMIODevice* dev_instance);
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AddressMapEntry* find_range_contains(uint32_t addr, uint32_t size);
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AddressMapEntry* find_range_overlaps(uint32_t addr, uint32_t size);
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bool is_range_free(uint32_t addr, uint32_t size);
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AddressMapEntry* find_rom_region();
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uint8_t *get_region_hostmem_ptr(const uint32_t addr);
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protected:
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bool add_mem_region(
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uint32_t start_addr, uint32_t size, uint32_t dest_addr, uint32_t type,
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uint8_t init_val
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);
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bool add_mem_mirror_common(uint32_t start_addr, uint32_t dest_addr,
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uint32_t offset=0, uint32_t size=0);
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private:
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std::vector<uint8_t*> mem_regions;
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std::vector<AddressMapEntry*> address_map;
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};
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#endif // MEMORY_CONTROLLER_BASE_H
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