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-rw-r--r--src/emu/emumem_heu.h90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/emu/emumem_heu.h b/src/emu/emumem_heu.h
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+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// handler_entry_read_units/handler_entry_write_units
+
+// merges/splits an access among multiple handlers (unitmask support)
+
+template<int Width, int AddrShift, int Endian> class handler_entry_read_units : public handler_entry_read<Width, AddrShift, Endian>
+{
+public:
+ using uX = typename handler_entry_size<Width>::uX;
+ using READ = typename handler_entry_size<Width>::READ;
+ using inh = handler_entry_read<Width, AddrShift, Endian>;
+
+ handler_entry_read_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, address_space *space);
+ handler_entry_read_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, const handler_entry_read_units *src);
+ ~handler_entry_read_units();
+
+ uX read(offs_t offset, uX mem_mask) override;
+
+ std::string name() const override;
+
+ void enumerate_references(handler_entry::reflist &refs) const override;
+
+private:
+ static constexpr u32 SUBUNIT_COUNT = 1 << Width;
+
+ struct subunit_info
+ {
+ handler_entry *m_handler; // the handler itself, the root to hide the templatization
+
+ uX m_amask; // access mask (for filtering access)
+ uX m_dmask; // data mask (for removal on collisions)
+ s8 m_ashift; // shift to apply to the address (positive = right)
+ u8 m_offset; // offset to add to the address post shift
+ u8 m_dshift; // data shift of the subunit
+
+ u8 m_width; // access width (0..3)
+ u8 m_endian; // endianness
+ };
+
+ subunit_info m_subunit_infos[SUBUNIT_COUNT]; // subunit information
+ uX m_unmap; // "unmapped" value to add to reads
+ u8 m_subunits; // number of subunits
+
+ void fill(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, const std::vector<typename memory_units_descriptor<Width, AddrShift, Endian>::entry> &entries);
+ static std::string m2r(uX mask);
+};
+
+template<int Width, int AddrShift, int Endian> class handler_entry_write_units : public handler_entry_write<Width, AddrShift, Endian>
+{
+public:
+ using uX = typename handler_entry_size<Width>::uX;
+ using WRITE = typename handler_entry_size<Width>::WRITE;
+ using inh = handler_entry_write<Width, AddrShift, Endian>;
+
+ handler_entry_write_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, address_space *space);
+ handler_entry_write_units(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, u8 ukey, const handler_entry_write_units<Width, AddrShift, Endian> *src);
+ ~handler_entry_write_units();
+
+ void write(offs_t offset, uX data, uX mem_mask) override;
+
+ std::string name() const override;
+
+ void enumerate_references(handler_entry::reflist &refs) const override;
+
+private:
+ static constexpr u32 SUBUNIT_COUNT = 1 << Width;
+
+ struct subunit_info
+ {
+ handler_entry *m_handler; // the handler itself, the root to hide the templatization
+
+ uX m_amask; // access mask (for filtering access)
+ uX m_dmask; // data mask (for removal on collisions)
+ s8 m_ashift; // shift to apply to the address (positive = right)
+ u8 m_offset; // offset to add to the address post shift
+ u8 m_dshift; // data shift of the subunit
+
+ u8 m_width; // access width (0..3)
+ u8 m_endian; // endianness
+ };
+
+ subunit_info m_subunit_infos[SUBUNIT_COUNT]; // subunit information
+ u8 m_subunits; // number of subunits
+
+ void fill(const memory_units_descriptor<Width, AddrShift, Endian> &descriptor, const std::vector<typename memory_units_descriptor<Width, AddrShift, Endian>::entry> &entries);
+ static std::string m2r(uX mask);
+};
+