mirror of
https://github.com/holub/mame
synced 2025-05-19 12:18:56 +03:00
639c9b85fc
A standard memory handler has as a prototype (where uX = u8, u16, u32 or u64): uX device::read(address_space &space, offs_t offset, uX mem_mask); void device::write(address_space &space, offs_t offset, uX data, uX mem_mask); We now allow simplified versions which are: uX device::read(offs_t offset, uX mem_mask); void device::write(offs_t offset, uX data, uX mem_mask); uX device::read(offs_t offset); void device::write(offs_t offset, uX data); uX device::read(); void device::write(uX data); Use them at will. Also consider (DECLARE_)(READ|WRITE)(8|16|32|64)_MEMBER on the way out, use the explicit prototypes. Same for lambdas in the memory map, the parameters are now optional following the same combinations.
89 lines
3.9 KiB
C++
89 lines
3.9 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Olivier Galibert
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// handler_entry_read_units/handler_entry_write_units
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// merges/splits an access among multiple handlers (unitmask support)
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template<int Width, int AddrShift, int Endian> class handler_entry_read_units : public handler_entry_read<Width, AddrShift, Endian>
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{
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public:
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using uX = typename emu::detail::handler_entry_size<Width>::uX;
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using inh = handler_entry_read<Width, AddrShift, Endian>;
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handler_entry_read_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, address_space *space);
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handler_entry_read_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, const handler_entry_read_units *src);
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~handler_entry_read_units();
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uX read(offs_t offset, uX mem_mask) override;
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std::string name() const override;
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void enumerate_references(handler_entry::reflist &refs) const override;
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private:
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static constexpr u32 SUBUNIT_COUNT = 1 << Width;
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struct subunit_info
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{
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handler_entry *m_handler; // the handler itself, the root to hide the templatization
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uX m_amask; // access mask (for filtering access)
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uX m_dmask; // data mask (for removal on collisions)
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s8 m_ashift; // shift to apply to the address (positive = right)
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u8 m_offset; // offset to add to the address post shift
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u8 m_dshift; // data shift of the subunit
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u8 m_width; // access width (0..3)
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u8 m_endian; // endianness
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};
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subunit_info m_subunit_infos[SUBUNIT_COUNT]; // subunit information
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uX m_unmap; // "unmapped" value to add to reads
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u8 m_subunits; // number of subunits
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void fill(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, const std::vector<typename memory_units_descriptor<Width, AddrShift, Endian>::entry> &entries);
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static std::string m2r(uX mask);
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};
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template<int Width, int AddrShift, int Endian> class handler_entry_write_units : public handler_entry_write<Width, AddrShift, Endian>
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{
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public:
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using uX = typename emu::detail::handler_entry_size<Width>::uX;
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using inh = handler_entry_write<Width, AddrShift, Endian>;
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handler_entry_write_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, address_space *space);
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handler_entry_write_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, const handler_entry_write_units<Width, AddrShift, Endian> *src);
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~handler_entry_write_units();
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void write(offs_t offset, uX data, uX mem_mask) override;
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std::string name() const override;
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void enumerate_references(handler_entry::reflist &refs) const override;
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private:
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static constexpr u32 SUBUNIT_COUNT = 1 << Width;
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struct subunit_info
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{
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handler_entry *m_handler; // the handler itself, the root to hide the templatization
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uX m_amask; // access mask (for filtering access)
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uX m_dmask; // data mask (for removal on collisions)
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s8 m_ashift; // shift to apply to the address (positive = right)
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u8 m_offset; // offset to add to the address post shift
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u8 m_dshift; // data shift of the subunit
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u8 m_width; // access width (0..3)
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u8 m_endian; // endianness
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};
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subunit_info m_subunit_infos[SUBUNIT_COUNT]; // subunit information
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u8 m_subunits; // number of subunits
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void fill(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, const std::vector<typename memory_units_descriptor<Width, AddrShift, Endian>::entry> &entries);
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static std::string m2r(uX mask);
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};
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