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https://github.com/holub/mame
synced 2025-06-10 06:47:18 +03:00
i86: add very limited lock support (just enough for the apricot
actually)
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7ff62b4b45
commit
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@ -282,6 +282,8 @@ i8086_common_cpu_device::i8086_common_cpu_device(const machine_config &mconfig,
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, m_irq_state(0)
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, m_test_state(1)
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, m_pc(0)
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, m_lock(false)
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, m_lock_handler(*this)
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{
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static const BREGS reg_name[8]={ AL, CL, DL, BL, AH, CH, DH, BH };
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@ -391,6 +393,8 @@ void i8086_common_cpu_device::device_start()
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state_add(STATE_GENFLAGS, "GENFLAGS", m_TF).callimport().callexport().formatstr("%16s").noshow();
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m_icountptr = &m_icount;
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m_lock_handler.resolve_safe();
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}
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@ -438,6 +442,7 @@ void i8086_common_cpu_device::device_reset()
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m_dst = 0;
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m_src = 0;
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m_halt = false;
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m_lock = false;
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}
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@ -1910,7 +1915,9 @@ bool i8086_common_cpu_device::common_op(UINT8 op)
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break;
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case 0xe4: // i_inal
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if (m_lock) m_lock_handler(1);
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m_regs.b[AL] = read_port_byte( fetch() );
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if (m_lock) { m_lock_handler(0); m_lock = false; }
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CLK(IN_IMM8);
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break;
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@ -2011,6 +2018,7 @@ bool i8086_common_cpu_device::common_op(UINT8 op)
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case 0xf0: // i_lock
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logerror("%s: %06x: Warning - BUSLOCK\n", tag(), pc());
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m_lock = true;
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m_no_interrupt = 1;
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CLK(NOP);
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break;
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@ -14,6 +14,10 @@ extern const device_type I8088;
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#define INPUT_LINE_TEST 20
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#define MCFG_I8086_LOCK_HANDLER(_write) \
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devcb = &i8086_common_cpu_device::set_lock_handler(*device, DEVCB_##_write);
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enum
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{
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I8086_PC=0,
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@ -29,6 +33,9 @@ public:
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// construction/destruction
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i8086_common_cpu_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source);
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template<class _Object> static devcb_base &set_lock_handler(device_t &device, _Object object)
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{ return downcast<i8086_common_cpu_device &>(device).m_lock_handler.set_callback(object); }
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protected:
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enum
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{
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@ -325,6 +332,9 @@ protected:
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UINT8 m_timing[200];
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bool m_halt;
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bool m_lock;
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devcb_write_line m_lock_handler;
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};
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class i8086_cpu_device : public i8086_common_cpu_device
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