mirror of
https://github.com/holub/mame
synced 2025-06-03 19:36:26 +03:00
c4a9a22eb1
This makes it simpler to install read-write handlers, as you don't need to think about the "smo" suffixes.
100 lines
4.3 KiB
C++
100 lines
4.3 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Olivier Galibert
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#ifndef MAME_EMU_EMUMEM_HEU_H
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#define MAME_EMU_EMUMEM_HEU_H
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#pragma once
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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> class handler_entry_read_units : public handler_entry_read<Width, AddrShift>
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{
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public:
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using uX = emu::detail::handler_entry_size_t<Width>;
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handler_entry_read_units(const memory_units_descriptor<Width, AddrShift> &descriptor, u8 ukey, address_space *space);
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handler_entry_read_units(const memory_units_descriptor<Width, AddrShift> &descriptor, u8 ukey, const handler_entry_read_units *src);
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handler_entry_read_units(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) const override;
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uX read_interruptible(offs_t offset, uX mem_mask) const override;
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std::pair<uX, u16> read_flags(offs_t offset, uX mem_mask) const override;
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u16 lookup_flags(offs_t offset, uX mem_mask) const 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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handler_entry_read<Width, AddrShift> *dup() 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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};
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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> &descriptor, const std::vector<typename memory_units_descriptor<Width, AddrShift>::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> class handler_entry_write_units : public handler_entry_write<Width, AddrShift>
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{
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public:
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using uX = emu::detail::handler_entry_size_t<Width>;
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handler_entry_write_units(const memory_units_descriptor<Width, AddrShift> &descriptor, u8 ukey, address_space *space);
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handler_entry_write_units(const memory_units_descriptor<Width, AddrShift> &descriptor, u8 ukey, const handler_entry_write_units<Width, AddrShift> *src);
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handler_entry_write_units(const handler_entry_write_units *src);
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~handler_entry_write_units();
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void write(offs_t offset, uX data, uX mem_mask) const override;
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void write_interruptible(offs_t offset, uX data, uX mem_mask) const override;
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u16 write_flags(offs_t offset, uX data, uX mem_mask) const override;
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u16 lookup_flags(offs_t offset, uX mem_mask) const 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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handler_entry_write<Width, AddrShift> *dup() 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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};
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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> &descriptor, const std::vector<typename memory_units_descriptor<Width, AddrShift>::entry> &entries);
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static std::string m2r(uX mask);
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};
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#endif // MAME_EMU_EMUMEM_HEU_H
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