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m6502: mcu capabilities [O. Galibert]

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This commit is contained in:
Olivier Galibert 2018-08-21 13:15:33 +02:00
parent dc59de3351
commit afdcf4dcec
2 changed files with 73 additions and 1 deletions
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61
src/devices/cpu/m6502/m6502.cpp
View File

@ -107,6 +107,7 @@ void m6502_device::init()
inst_state_base = 0;
sync = false;
inhibit_interrupts = false;
count_before_instruction_step = 0;
}
void m6502_device::device_reset()
@ -554,5 +555,65 @@ uint8_t m6502_device::mi_default_nd::read_arg(uint16_t adr)
return program->read_byte(adr);
}
m6502_mcu_device::m6502_mcu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
m6502_device(mconfig, type, tag, owner, clock)
{
}
void m6502_mcu_device::recompute_bcount(uint64_t event_time)
{
if(!event_time || event_time >= total_cycles() + icount) {
bcount = 0;
return;
}
bcount = total_cycles() + icount - event_time;
}
void m6502_mcu_device::execute_run()
{
internal_update(total_cycles());
icount -= count_before_instruction_step;
if(icount < 0) {
count_before_instruction_step = -icount;
icount = 0;
} else
count_before_instruction_step = 0;
while(bcount && icount <= bcount)
internal_update(total_cycles() + icount - bcount);
if(icount > 0 && inst_substate)
do_exec_partial();
while(icount > 0) {
while(icount > bcount) {
if(inst_state < 0x10000) {
PPC = NPC;
debugger_instruction_hook(NPC);
}
do_exec_full();
}
if(icount > 0)
while(bcount && icount <= bcount)
internal_update(total_cycles() + icount - bcount);
if(icount > 0 && inst_substate)
do_exec_partial();
}
if(icount < 0) {
count_before_instruction_step = -icount;
icount = 0;
}
}
void m6502_mcu_device::add_event(uint64_t &event_time, uint64_t new_event)
{
if(!new_event)
return;
if(!event_time || event_time > new_event)
event_time = new_event;
}
#include "cpu/m6502/m6502.hxx"

13
src/devices/cpu/m6502/m6502.h
View File

@ -126,7 +126,7 @@ protected:
std::unique_ptr<memory_interface> mintf;
int inst_state, inst_substate;
int icount;
int icount, bcount, count_before_instruction_step;
bool nmi_state, irq_state, apu_irq_state, v_state;
bool irq_taken, sync, cache_disabled, inhibit_interrupts;
@ -271,6 +271,17 @@ protected:
#undef O
};
class m6502_mcu_device : public m6502_device {
protected:
m6502_mcu_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
virtual void internal_update(uint64_t current_time) = 0;
void recompute_bcount(uint64_t event_time);
static void add_event(uint64_t &event_time, uint64_t new_event);
virtual void execute_run() override;
};
enum {
M6502_PC = 1,
M6502_A,