mirror of
https://github.com/StrikerX3/StrikeBox.git
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88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
#pragma once
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#include <cstdint>
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#include <map>
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#include <set>
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namespace vixen {
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class IOMapper;
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/*!
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* Abstract base class that represents devices that respond to port-mapped
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* and/or memory-mapped I/O.
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*
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* I/O functions return true if the I/O operation was handled by the device.
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*
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* The default implementations read the value 0 and don't handle I/O.
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*/
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class IODevice {
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public:
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virtual bool MapIO(IOMapper *mapper) = 0;
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virtual bool IORead(uint32_t port, uint32_t *value, uint8_t size);
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virtual bool IOWrite(uint32_t port, uint32_t value, uint8_t size);
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virtual bool MMIORead(uint32_t addr, uint32_t *value, uint8_t size);
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virtual bool MMIOWrite(uint32_t addr, uint32_t value, uint8_t size);
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};
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/*!
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* A mapped I/O device with specified I/O or MMIO ranges.
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*/
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struct MappedDevice {
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// I/O or MMIO addresses
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uint32_t baseAddress;
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uint32_t lastAddress;
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// The device itself
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IODevice *device;
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};
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/*!
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* Maps I/O and MMIO reads and writes to the corresponding devices.
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*/
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class IOMapper {
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public:
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/*!
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* Maps a device to the specified range of ports.
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*/
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bool MapIODevice(uint32_t basePort, uint32_t numPorts, IODevice *device);
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/*!
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* Maps a device to the specified MMIO range.
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*/
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bool MapMMIODevice(uint32_t baseAddress, uint32_t numAddresses, IODevice *device);
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/*!
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* Adds a device with dynamic I/O address mapping.
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*/
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bool AddDevice(IODevice *device);
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bool IORead(uint32_t addr, uint32_t *value, uint8_t size);
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bool IOWrite(uint32_t addr, uint32_t value, uint8_t size);
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bool MMIORead(uint32_t addr, uint32_t *value, uint8_t size);
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bool MMIOWrite(uint32_t addr, uint32_t value, uint8_t size);
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private:
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/*!
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* Looks up the I/O device mapped to the specified I/O or MMIO address,
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* depending on the map used.
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*
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* Returns true if found.
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*/
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bool LookupDevice(std::map<uint32_t, MappedDevice>& iomap, uint32_t addr, IODevice **device);
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/*!
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* Maps a device to the specified address range.
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*/
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bool MapDevice(std::map<uint32_t, MappedDevice>& iomap, uint32_t base, uint32_t size, IODevice *device);
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std::map<uint32_t, MappedDevice> m_mappedIODevices;
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std::map<uint32_t, MappedDevice> m_mappedMMIODevices;
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std::set<IODevice *> m_dynamicDevices;
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};
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}
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