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ns32000: bug fix

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* fixed ins instruction
* added address calculation and operand fetch cycles
This commit is contained in:
Patrick Mackinlay 2021-05-07 16:52:29 +07:00
parent d4c5b61d35
commit be318e0491
2 changed files with 289 additions and 203 deletions
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470
src/devices/cpu/ns32000/ns32000.cpp
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22
src/devices/cpu/ns32000/ns32000.h
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@ -42,7 +42,6 @@ protected:
// device_disasm_interface overrides
virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
private:
enum addr_mode_type : unsigned
{
IMM,
@ -69,6 +68,24 @@ private:
SIZE_Q = 7,
};
// 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;
switch (size)
{
case SIZE_B: return 3 + tmmu;
case SIZE_W: return (address & 1) ? 7 + 2 * tmmu : 3 + tmmu;
case SIZE_D: return (address & 1) ? 11 + 3 * tmmu : 7 + 2 * tmmu;
case SIZE_Q: return (address & 1) ? 19 + 5 * tmmu : 15 + 4 * tmmu;
}
// can't happen
return 0;
}
struct addr_mode
{
addr_mode(unsigned gen)
@ -78,6 +95,7 @@ private:
, base(0)
, disp(0)
, imm(0)
, tea(0)
{};
void read_i(size_code code) { access = READ; size = code; }
@ -97,6 +115,7 @@ private:
u32 base;
u32 disp;
u64 imm;
unsigned tea;
};
// instruction decoding helpers
@ -115,6 +134,7 @@ private:
void interrupt(unsigned const vector, u32 const return_address, bool const trap = true);
u16 slave(addr_mode op1, addr_mode op2);
private:
// configuration
address_space_config m_program_config;
address_space_config m_interrupt_config;