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ns32000: prepare for mmu

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* centralized memory accessors
* added translation interface
* implemented some missing instructions
* add cascaded interrupt support
This commit is contained in:
Patrick Mackinlay 2021-06-04 16:46:56 +07:00
parent 242f986c1e
commit 87ca33171f
3 changed files with 609 additions and 323 deletions
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885
src/devices/cpu/ns32000/ns32000.cpp
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File diff suppressed because it is too large Load Diff

29
src/devices/cpu/ns32000/ns32000.h
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@ -13,6 +13,7 @@ class ns32000_device : public cpu_device
{
public:
template <typename T> void set_fpu(T &&tag) { m_fpu.set_tag(std::forward<T>(tag)); }
template <typename T> void set_mmu(T &&tag) { m_mmu.set_tag(std::forward<T>(tag)); }
// construction/destruction
ns32000_device(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock);
@ -44,12 +45,12 @@ protected:
enum addr_mode_type : unsigned
{
IMM,
REG,
MEM,
IND,
EXT,
TOS,
IMM, // immediate
REG, // register
MEM, // memory space
REL, // memory relative
EXT, // external
TOS, // top of stack
};
enum access_class : unsigned
{
@ -71,8 +72,7 @@ protected:
// time needed to read or write a memory operand
unsigned top(size_code const size, u32 const address = 0) const
{
// TODO: mmu cycles
static constexpr unsigned tmmu = 0;
unsigned const tmmu = m_mmu ? 1 : 0;
switch (size)
{
@ -118,7 +118,12 @@ protected:
unsigned tea;
};
// instruction decoding helpers
// memory accessors
template <typename T> T mem_read(unsigned st, u32 address, bool user = false);
template <typename T> void mem_write(unsigned st, u32 address, T data, bool user = false);
// instruction fetch/decode helpers
template <typename T> T fetch(unsigned &bytes);
s32 displacement(unsigned &bytes);
void decode(addr_mode *mode, unsigned &bytes);
@ -132,7 +137,7 @@ protected:
bool condition(unsigned const cc);
void flags(u32 const src1, u32 const src2, u32 const dest, unsigned const size, bool const subtraction);
void interrupt(unsigned const vector, u32 const return_address, bool const trap = true);
u16 slave(addr_mode op1, addr_mode op2);
u16 slave(ns32000_slave_interface *slave, addr_mode op1, addr_mode op2);
private:
// configuration
@ -140,12 +145,16 @@ private:
address_space_config m_interrupt_config;
optional_device<ns32000_slave_interface> m_fpu;
optional_device<ns32000_mmu_interface> m_mmu;
// emulation state
int m_icount;
typename memory_access<24, Width, 0, ENDIANNESS_LITTLE>::specific m_bus[16];
u32 m_ssp; // saved stack pointer
u16 m_sps; // saved program status
u32 m_pc; // program counter
u32 m_sb; // static base
u32 m_fp; // frame pointer

18
src/devices/cpu/ns32000/slave.h
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@ -33,6 +33,12 @@ public:
virtual u16 read_op() = 0;
protected:
ns32000_slave_interface(machine_config const &mconfig, device_t &device, char const *type)
: device_interface(device, type)
, m_out_scb(*this)
{
}
// device_interface overrides
virtual void interface_post_start() override
{
@ -42,4 +48,16 @@ protected:
devcb_write_line m_out_scb;
};
class ns32000_mmu_interface : public ns32000_slave_interface
{
public:
ns32000_mmu_interface(machine_config const &mconfig, device_t &device)
: ns32000_slave_interface(mconfig, device, "ns32000_mmu")
{
}
enum translate_result : unsigned { COMPLETE, CANCEL, ABORT };
virtual translate_result translate(address_space &space, unsigned st, u32 &address, bool user, bool write, bool debug = false) = 0;
};
#endif // MAME_CPU_NS32000_SLAVE_H