summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/cpu/i86/i86.c
diff options
context:
space:
mode:
author Dirk Best <mail@dirk-best.de>2015-06-09 16:57:51 +0200
committer Dirk Best <mail@dirk-best.de>2015-06-09 17:01:07 +0200
commitbb8ef78d03e10b0983dcca40fafa1b8607c5a61c (patch)
tree0f7d1eb6d6efd1e75829634904bad88d375b98d3 /src/emu/cpu/i86/i86.c
parent7ff62b4b455e08a797709abe9c9444bf9858c64b (diff)
i86: add very limited lock support (just enough for the apricot
actually)
Diffstat (limited to 'src/emu/cpu/i86/i86.c')
-rw-r--r--src/emu/cpu/i86/i86.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/emu/cpu/i86/i86.c b/src/emu/cpu/i86/i86.c
index 7a308da61a9..299d85b1f59 100644
--- a/src/emu/cpu/i86/i86.c
+++ b/src/emu/cpu/i86/i86.c
@@ -282,6 +282,8 @@ i8086_common_cpu_device::i8086_common_cpu_device(const machine_config &mconfig,
, m_irq_state(0)
, m_test_state(1)
, m_pc(0)
+ , m_lock(false)
+ , m_lock_handler(*this)
{
static const BREGS reg_name[8]={ AL, CL, DL, BL, AH, CH, DH, BH };
@@ -391,6 +393,8 @@ void i8086_common_cpu_device::device_start()
state_add(STATE_GENFLAGS, "GENFLAGS", m_TF).callimport().callexport().formatstr("%16s").noshow();
m_icountptr = &m_icount;
+
+ m_lock_handler.resolve_safe();
}
@@ -438,6 +442,7 @@ void i8086_common_cpu_device::device_reset()
m_dst = 0;
m_src = 0;
m_halt = false;
+ m_lock = false;
}
@@ -1910,7 +1915,9 @@ bool i8086_common_cpu_device::common_op(UINT8 op)
break;
case 0xe4: // i_inal
+ if (m_lock) m_lock_handler(1);
m_regs.b[AL] = read_port_byte( fetch() );
+ if (m_lock) { m_lock_handler(0); m_lock = false; }
CLK(IN_IMM8);
break;
@@ -2011,6 +2018,7 @@ bool i8086_common_cpu_device::common_op(UINT8 op)
case 0xf0: // i_lock
logerror("%s: %06x: Warning - BUSLOCK\n", tag(), pc());
+ m_lock = true;
m_no_interrupt = 1;
CLK(NOP);
break;