[thirdparty/binutils-gdb.git] / sim / mn10300 / dv-mn103cpu.c

/*  This file is part of the program GDB, the GNU debugger.
    
    Copyright (C) 1998-2013 Free Software Foundation, Inc.
    Contributed by Cygnus Solutions.
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    */


#include "sim-main.h"
#include "hw-main.h"

/* DEVICE

   
   mn103cpu - mn10300 cpu virtual device

   
   DESCRIPTION

   
   Implements the external mn10300 functionality.  This includes the
   delivery of interrupts generated from other devices and the
   handling of device specific registers.


   PROPERTIES
   

   reg = <address> <size>

   Specify the address of the mn10300's control register block.  This
   block contains the Interrupt Vector Registers.

   The reg property value `0x20000000 0x42' locates the register block
   at the address specified in the mn10300 user guide.


   PORTS


   reset (input)

   Currently ignored.


   nmi (input)

   Deliver a non-maskable interrupt to the processor.


   level (input)

   Maskable interrupt level port port.  The interrupt controller
   notifies the processor of any change in the level of pending
   requested interrupts via this port.


   ack (output)

   Output signal indicating that the processor is delivering a level
   interrupt.  The value passed with the event specifies the level of
   the interrupt being delivered.


   BUGS


   When delivering an interrupt, this code assumes that there is only
   one processor (number 0).

   This code does not attempt to be efficient at handling pending
   interrupts.  It simply schedules the interrupt delivery handler
   every instruction cycle until all pending interrupts go away.  An
   alternative implementation might modify instructions that change
   the PSW and have them check to see if the change makes an interrupt
   delivery possible.

   */


/* The interrupt vectors */

enum { NR_VECTORS = 7, };


/* The interrupt controller register address blocks */

struct mn103cpu_block {
  unsigned_word base;
  unsigned_word bound;
};


struct mn103cpu {
  struct mn103cpu_block block;
  struct hw_event *pending_handler;
  int pending_level;
  int pending_nmi;
  int pending_reset;
  /* the visible registers */
  unsigned16 interrupt_vector[NR_VECTORS];
  unsigned16 internal_memory_control;
  unsigned16 cpu_mode;
};


/* input port ID's */ 

enum {
  RESET_PORT,
  NMI_PORT,
  LEVEL_PORT,
};


/* output port ID's */

enum {
  ACK_PORT,
};

static const struct hw_port_descriptor mn103cpu_ports[] = {

  /* interrupt inputs */
  { "reset", RESET_PORT, 0, input_port, },
  { "nmi", NMI_PORT, 0, input_port, },
  { "level", LEVEL_PORT, 0, input_port, },

  /* interrupt ack (latch) output from cpu */
  { "ack", ACK_PORT, 0, output_port, },

  { NULL, },
};


/* Finish off the partially created hw device.  Attach our local
   callbacks.  Wire up our port names etc */

static hw_io_read_buffer_method mn103cpu_io_read_buffer;
static hw_io_write_buffer_method mn103cpu_io_write_buffer;
static hw_port_event_method mn103cpu_port_event;

static void
attach_mn103cpu_regs (struct hw *me,
		      struct mn103cpu *controller)
{
  unsigned_word attach_address;
  int attach_space;
  unsigned attach_size;
  reg_property_spec reg;
  if (hw_find_property (me, "reg") == NULL)
    hw_abort (me, "Missing \"reg\" property");
  if (!hw_find_reg_array_property (me, "reg", 0, &reg))
    hw_abort (me, "\"reg\" property must contain three addr/size entries");
  hw_unit_address_to_attach_address (hw_parent (me),
				     &reg.address,
				     &attach_space,
				     &attach_address,
				     me);
  controller->block.base = attach_address;
  hw_unit_size_to_attach_size (hw_parent (me),
			       &reg.size,
			       &attach_size, me);
  controller->block.bound = attach_address + (attach_size - 1);
  if ((controller->block.base & 3) != 0)
    hw_abort (me, "cpu register block must be 4 byte aligned");
  hw_attach_address (hw_parent (me),
		     0,
		     attach_space, attach_address, attach_size,
		     me);
}


static void
mn103cpu_finish (struct hw *me)
{
  struct mn103cpu *controller;

  controller = HW_ZALLOC (me, struct mn103cpu);
  set_hw_data (me, controller);
  set_hw_io_read_buffer (me, mn103cpu_io_read_buffer);
  set_hw_io_write_buffer (me, mn103cpu_io_write_buffer);
  set_hw_ports (me, mn103cpu_ports);
  set_hw_port_event (me, mn103cpu_port_event);

  /* Attach ourself to our parent bus */
  attach_mn103cpu_regs (me, controller);

  /* Initialize the read-only registers */
  controller->pending_level = 7; /* FIXME */
  /* ... */
}


/* An event arrives on an interrupt port */

static void
deliver_mn103cpu_interrupt (struct hw *me,
			    void *data)
{
  struct mn103cpu *controller = hw_data (me);
  SIM_DESC simulator = hw_system (me);
  sim_cpu *cpu = STATE_CPU (simulator, 0);

  if (controller->pending_reset)
    {
      controller->pending_reset = 0;
      /* need to clear all registers et.al! */
      HW_TRACE ((me, "Reset!"));
      hw_abort (me, "Reset!");
    }
  else if (controller->pending_nmi)
    {
      controller->pending_nmi = 0;
      store_word (SP - 4, CIA_GET (cpu));
      store_half (SP - 8, PSW);
      PSW &= ~PSW_IE;
      SP = SP - 8;
      CIA_SET (cpu, 0x40000008);
      HW_TRACE ((me, "nmi pc=0x%08lx psw=0x%04x sp=0x%08lx",
		 (long) CIA_GET (cpu), (unsigned) PSW, (long) SP));
    }
  else if ((controller->pending_level < EXTRACT_PSW_LM)
	   && (PSW & PSW_IE))
    {
      /* Don't clear pending level.  Request continues to be pending
         until the interrupt controller clears/changes it */
      store_word (SP - 4, CIA_GET (cpu));
      store_half (SP - 8, PSW);
      PSW &= ~PSW_IE;
      PSW &= ~PSW_LM;
      PSW |= INSERT_PSW_LM (controller->pending_level);
      SP = SP - 8;
      CIA_SET (cpu, 0x40000000 + controller->interrupt_vector[controller->pending_level]);
      HW_TRACE ((me, "port-out ack %d", controller->pending_level));
      hw_port_event (me, ACK_PORT, controller->pending_level);
      HW_TRACE ((me, "int level=%d pc=0x%08lx psw=0x%04x sp=0x%08lx",
		 controller->pending_level,
		 (long) CIA_GET (cpu), (unsigned) PSW, (long) SP));
    }

  if (controller->pending_level < 7) /* FIXME */
    {
      /* As long as there is the potential need to deliver an
	 interrupt we keep rescheduling this routine. */
      if (controller->pending_handler != NULL)
	controller->pending_handler =
	  hw_event_queue_schedule (me, 1, deliver_mn103cpu_interrupt, NULL);
    }
  else
    {
      /* Don't bother re-scheduling the interrupt handler as there is
         nothing to deliver */
      controller->pending_handler = NULL;
    }

}


static void
mn103cpu_port_event (struct hw *me,
		     int my_port,
		     struct hw *source,
		     int source_port,
		     int level)
{
  struct mn103cpu *controller = hw_data (me);

  /* Schedule our event handler *now* */
  if (controller->pending_handler == NULL)
    controller->pending_handler =
      hw_event_queue_schedule (me, 0, deliver_mn103cpu_interrupt, NULL);

  switch (my_port)
    {
      
    case RESET_PORT:
      controller->pending_reset = 1;
      HW_TRACE ((me, "port-in reset"));
      break;
      
    case NMI_PORT:
      controller->pending_nmi = 1;
      HW_TRACE ((me, "port-in nmi"));
      break;
      
    case LEVEL_PORT:
      controller->pending_level = level;
      HW_TRACE ((me, "port-in level=%d", level));
      break;
      
    default:
      hw_abort (me, "bad switch");
      break;

    }
}


/* Read/write to a CPU register */

enum mn103cpu_regs {
  INVALID_REG,
  IVR0_REG,
  IVR1_REG,
  IVR2_REG,
  IVR3_REG,
  IVR4_REG,
  IVR5_REG,
  IVR6_REG,
  IMCR_REG,
  CPUM_REG,
};

static enum mn103cpu_regs
decode_mn103cpu_addr (struct hw *me,
		      struct mn103cpu *controller,
		      unsigned_word base)
{
  switch (base - controller->block.base)
    {
    case 0x000: return IVR0_REG;
    case 0x004: return IVR1_REG;
    case 0x008: return IVR2_REG;
    case 0x00c: return IVR3_REG;
    case 0x010: return IVR4_REG;
    case 0x014: return IVR5_REG;
    case 0x018: return IVR6_REG;
    case 0x020: return IMCR_REG;
    case 0x040: return CPUM_REG;
    default: return INVALID_REG;
    }
}

static unsigned
mn103cpu_io_read_buffer (struct hw *me,
			 void *dest,
			 int space,
			 unsigned_word base,
			 unsigned nr_bytes)
{
  struct mn103cpu *controller = hw_data (me);
  unsigned16 val = 0;
  enum mn103cpu_regs reg = decode_mn103cpu_addr (me, controller, base);

  switch (reg)
    {
    case IVR0_REG:
    case IVR1_REG:
    case IVR2_REG:
    case IVR3_REG:
    case IVR4_REG:
    case IVR5_REG:
    case IVR6_REG:
      val = controller->interrupt_vector[reg - IVR0_REG];
      break;
    case IMCR_REG:
      val = controller->internal_memory_control;
      break;
    case CPUM_REG:
      val = controller->cpu_mode;
      break;
    default:
      /* just ignore the read */
      break;
    }

  if (nr_bytes == 2)
    *(unsigned16*) dest = H2LE_2 (val);

  return nr_bytes;
}     

static unsigned
mn103cpu_io_write_buffer (struct hw *me,
			  const void *source,
			  int space,
			  unsigned_word base,
			  unsigned nr_bytes)
{
  struct mn103cpu *controller = hw_data (me);
  unsigned16 val;
  enum mn103cpu_regs reg;

  if (nr_bytes != 2)
    hw_abort (me, "must be two byte write");

  reg = decode_mn103cpu_addr (me, controller, base);
  val = LE2H_2 (* (unsigned16 *) source);

  switch (reg)
    {
    case IVR0_REG:
    case IVR1_REG:
    case IVR2_REG:
    case IVR3_REG:
    case IVR4_REG:
    case IVR5_REG:
    case IVR6_REG:
      controller->interrupt_vector[reg - IVR0_REG] = val;
      HW_TRACE ((me, "ivr%d = 0x%04lx", reg - IVR0_REG, (long) val));
      break;
    default:
      /* just ignore the write */
      break;
    }

  return nr_bytes;
}     


const struct hw_descriptor dv_mn103cpu_descriptor[] = {
  { "mn103cpu", mn103cpu_finish, },
  { NULL },
};
Commit	Line	Data
c906108c SS	1	/* This file is part of the program GDB, the GNU debugger.
c906108c SS	2
8acc9f48	3	Copyright (C) 1998-2013 Free Software Foundation, Inc.
c906108c SS	4	Contributed by Cygnus Solutions.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
4744ac1b	8	the Free Software Foundation; either version 3 of the License, or
c906108c	9	(at your option) any later version.
4744ac1b	10
c906108c SS	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
4744ac1b	15
c906108c	16	You should have received a copy of the GNU General Public License
4744ac1b	17	along with this program. If not, see <http://www.gnu.org/licenses/>.
c906108c SS	18
	19	*/
	20
	21
	22	#include "sim-main.h"
	23	#include "hw-main.h"
	24
	25	/* DEVICE
	26
	27
	28	mn103cpu - mn10300 cpu virtual device
	29
	30
	31	DESCRIPTION
	32
	33
	34	Implements the external mn10300 functionality. This includes the
	35	delivery of interrupts generated from other devices and the
	36	handling of device specific registers.
	37
	38
	39	PROPERTIES
	40
	41
	42	reg = <address> <size>
	43
	44	Specify the address of the mn10300's control register block. This
	45	block contains the Interrupt Vector Registers.
	46
	47	The reg property value `0x20000000 0x42' locates the register block
	48	at the address specified in the mn10300 user guide.
	49
	50
	51	PORTS
	52
	53
	54	reset (input)
	55
	56	Currently ignored.
	57
	58
	59	nmi (input)
	60
	61	Deliver a non-maskable interrupt to the processor.
	62
	63
	64	level (input)
	65
	66	Maskable interrupt level port port. The interrupt controller
	67	notifies the processor of any change in the level of pending
	68	requested interrupts via this port.
	69
	70
	71	ack (output)
	72
	73	Output signal indicating that the processor is delivering a level
	74	interrupt. The value passed with the event specifies the level of
	75	the interrupt being delivered.
	76
	77
	78	BUGS
	79
	80
	81	When delivering an interrupt, this code assumes that there is only
82	one processor (number 0).
83
84	This code does not attempt to be efficient at handling pending
85	interrupts. It simply schedules the interrupt delivery handler
86	every instruction cycle until all pending interrupts go away. An
87	alternative implementation might modify instructions that change
88	the PSW and have them check to see if the change makes an interrupt
89	delivery possible.
90
91	*/
92
93
94	/* The interrupt vectors */
95
96	enum { NR_VECTORS = 7, };
97
98
99	/* The interrupt controller register address blocks */
100
101	struct mn103cpu_block {
102	unsigned_word base;
103	unsigned_word bound;
104	};
105
106
107	struct mn103cpu {
108	struct mn103cpu_block block;
109	struct hw_event *pending_handler;
110	int pending_level;
111	int pending_nmi;
112	int pending_reset;
113	/* the visible registers */
114	unsigned16 interrupt_vector[NR_VECTORS];
115	unsigned16 internal_memory_control;
116	unsigned16 cpu_mode;
117	};
118
119
120
121	/* input port ID's */
122
123	enum {
124	RESET_PORT,
125	NMI_PORT,
126	LEVEL_PORT,
127	};
128
129
130	/* output port ID's */
131
132	enum {
133	ACK_PORT,
134	};
135
136	static const struct hw_port_descriptor mn103cpu_ports[] = {
137
138	/* interrupt inputs */
139	{ "reset", RESET_PORT, 0, input_port, },
140	{ "nmi", NMI_PORT, 0, input_port, },
141	{ "level", LEVEL_PORT, 0, input_port, },
142
143	/* interrupt ack (latch) output from cpu */
144	{ "ack", ACK_PORT, 0, output_port, },
145
146	{ NULL, },
147	};
148
149
150	/* Finish off the partially created hw device. Attach our local
151	callbacks. Wire up our port names etc */
152
153	static hw_io_read_buffer_method mn103cpu_io_read_buffer;
154	static hw_io_write_buffer_method mn103cpu_io_write_buffer;
155	static hw_port_event_method mn103cpu_port_event;
156
157	static void
158	attach_mn103cpu_regs (struct hw *me,
159	struct mn103cpu *controller)
160	{
161	unsigned_word attach_address;
162	int attach_space;
163	unsigned attach_size;
164	reg_property_spec reg;
165	if (hw_find_property (me, "reg") == NULL)
166	hw_abort (me, "Missing \"reg\" property");
167	if (!hw_find_reg_array_property (me, "reg", 0, &reg))
168	hw_abort (me, "\"reg\" property must contain three addr/size entries");
169	hw_unit_address_to_attach_address (hw_parent (me),
170	&reg.address,
171	&attach_space,
172	&attach_address,
173	me);
174	controller->block.base = attach_address;
175	hw_unit_size_to_attach_size (hw_parent (me),
176	&reg.size,
177	&attach_size, me);
178	controller->block.bound = attach_address + (attach_size - 1);
179	if ((controller->block.base & 3) != 0)
180	hw_abort (me, "cpu register block must be 4 byte aligned");
181	hw_attach_address (hw_parent (me),
182	0,
183	attach_space, attach_address, attach_size,
184	me);
185	}
186
187
188	static void
189	mn103cpu_finish (struct hw *me)
190	{
191	struct mn103cpu *controller;
192
193	controller = HW_ZALLOC (me, struct mn103cpu);
194	set_hw_data (me, controller);
195	set_hw_io_read_buffer (me, mn103cpu_io_read_buffer);
196	set_hw_io_write_buffer (me, mn103cpu_io_write_buffer);
197	set_hw_ports (me, mn103cpu_ports);
198	set_hw_port_event (me, mn103cpu_port_event);
199
200	/* Attach ourself to our parent bus */
201	attach_mn103cpu_regs (me, controller);
202
203	/* Initialize the read-only registers */
204	controller->pending_level = 7; /* FIXME */
205	/* ... */
206	}
207
208
209
210	/* An event arrives on an interrupt port */
211
212	static void
213	deliver_mn103cpu_interrupt (struct hw *me,
214	void *data)
215	{
216	struct mn103cpu *controller = hw_data (me);
217	SIM_DESC simulator = hw_system (me);
218	sim_cpu *cpu = STATE_CPU (simulator, 0);
219
220	if (controller->pending_reset)
221	{
222	controller->pending_reset = 0;
223	/* need to clear all registers et.al! */
224	HW_TRACE ((me, "Reset!"));
225	hw_abort (me, "Reset!");
226	}
227	else if (controller->pending_nmi)
228	{
229	controller->pending_nmi = 0;
230	store_word (SP - 4, CIA_GET (cpu));
231	store_half (SP - 8, PSW);
232	PSW &= ~PSW_IE;
233	SP = SP - 8;
234	CIA_SET (cpu, 0x40000008);
235	HW_TRACE ((me, "nmi pc=0x%08lx psw=0x%04x sp=0x%08lx",
236	(long) CIA_GET (cpu), (unsigned) PSW, (long) SP));
237	}
238	else if ((controller->pending_level < EXTRACT_PSW_LM)
239	&& (PSW & PSW_IE))
240	{
241	/* Don't clear pending level. Request continues to be pending
242	until the interrupt controller clears/changes it */
243	store_word (SP - 4, CIA_GET (cpu));
244	store_half (SP - 8, PSW);
245	PSW &= ~PSW_IE;
246	PSW &= ~PSW_LM;
247	PSW \|= INSERT_PSW_LM (controller->pending_level);
248	SP = SP - 8;
249	CIA_SET (cpu, 0x40000000 + controller->interrupt_vector[controller->pending_level]);
250	HW_TRACE ((me, "port-out ack %d", controller->pending_level));
251	hw_port_event (me, ACK_PORT, controller->pending_level);
252	HW_TRACE ((me, "int level=%d pc=0x%08lx psw=0x%04x sp=0x%08lx",
253	controller->pending_level,
254	(long) CIA_GET (cpu), (unsigned) PSW, (long) SP));
255	}
256
257	if (controller->pending_level < 7) /* FIXME */
258	{
259	/* As long as there is the potential need to deliver an
260	interrupt we keep rescheduling this routine. */
261	if (controller->pending_handler != NULL)
262	controller->pending_handler =
263	hw_event_queue_schedule (me, 1, deliver_mn103cpu_interrupt, NULL);
264	}
265	else
266	{
267	/* Don't bother re-scheduling the interrupt handler as there is
268	nothing to deliver */
269	controller->pending_handler = NULL;
270	}
271
272	}
273
274
275	static void
276	mn103cpu_port_event (struct hw *me,
277	int my_port,
278	struct hw *source,
279	int source_port,
280	int level)
281	{
282	struct mn103cpu *controller = hw_data (me);
283
284	/* Schedule our event handler now */
285	if (controller->pending_handler == NULL)
286	controller->pending_handler =
287	hw_event_queue_schedule (me, 0, deliver_mn103cpu_interrupt, NULL);
288
289	switch (my_port)
290	{
291
292	case RESET_PORT:
293	controller->pending_reset = 1;
294	HW_TRACE ((me, "port-in reset"));
295	break;
296
297	case NMI_PORT:
298	controller->pending_nmi = 1;
299	HW_TRACE ((me, "port-in nmi"));
300	break;
301
302	case LEVEL_PORT:
303	controller->pending_level = level;
304	HW_TRACE ((me, "port-in level=%d", level));
305	break;
306
307	default:
308	hw_abort (me, "bad switch");
309	break;
310
311	}
312	}
313
314
315	/* Read/write to a CPU register */
316
317	enum mn103cpu_regs {
318	INVALID_REG,
319	IVR0_REG,
320	IVR1_REG,
321	IVR2_REG,
322	IVR3_REG,
323	IVR4_REG,
324	IVR5_REG,
325	IVR6_REG,
326	IMCR_REG,
327	CPUM_REG,
328	};
329
330	static enum mn103cpu_regs
331	decode_mn103cpu_addr (struct hw *me,
332	struct mn103cpu *controller,
333	unsigned_word base)
334	{
335	switch (base - controller->block.base)
336	{
337	case 0x000: return IVR0_REG;
338	case 0x004: return IVR1_REG;
339	case 0x008: return IVR2_REG;
340	case 0x00c: return IVR3_REG;
341	case 0x010: return IVR4_REG;
342	case 0x014: return IVR5_REG;
343	case 0x018: return IVR6_REG;
344	case 0x020: return IMCR_REG;
345	case 0x040: return CPUM_REG;
346	default: return INVALID_REG;
347	}
348	}
349
350	static unsigned
351	mn103cpu_io_read_buffer (struct hw *me,
352	void *dest,
353	int space,
354	unsigned_word base,
355	unsigned nr_bytes)
356	{
357	struct mn103cpu *controller = hw_data (me);
358	unsigned16 val = 0;
359	enum mn103cpu_regs reg = decode_mn103cpu_addr (me, controller, base);
360
361	switch (reg)
362	{
363	case IVR0_REG:
364	case IVR1_REG:
365	case IVR2_REG:
366	case IVR3_REG:
367	case IVR4_REG:
368	case IVR5_REG:
369	case IVR6_REG:
370	val = controller->interrupt_vector[reg - IVR0_REG];
371	break;
372	case IMCR_REG:
373	val = controller->internal_memory_control;
374	break;
375	case CPUM_REG:
376	val = controller->cpu_mode;
377	break;
378	default:
379	/* just ignore the read */
380	break;
381	}
382
383	if (nr_bytes == 2)
384	(unsigned16) dest = H2LE_2 (val);
385
386	return nr_bytes;
387	}
388
389	static unsigned
390	mn103cpu_io_write_buffer (struct hw *me,
391	const void *source,
392	int space,
393	unsigned_word base,
394	unsigned nr_bytes)
395	{
396	struct mn103cpu *controller = hw_data (me);
397	unsigned16 val;
398	enum mn103cpu_regs reg;
399
400	if (nr_bytes != 2)
401	hw_abort (me, "must be two byte write");
402
403	reg = decode_mn103cpu_addr (me, controller, base);
404	val = LE2H_2 (* (unsigned16 *) source);
405
406	switch (reg)
407	{
408	case IVR0_REG:
409	case IVR1_REG:
410	case IVR2_REG:
411	case IVR3_REG:
412	case IVR4_REG:
413	case IVR5_REG:
414	case IVR6_REG:
415	controller->interrupt_vector[reg - IVR0_REG] = val;
416	HW_TRACE ((me, "ivr%d = 0x%04lx", reg - IVR0_REG, (long) val));
417	break;
418	default:
419	/* just ignore the write */
420	break;
421	}
422
423	return nr_bytes;
424	}
425
426
427	const struct hw_descriptor dv_mn103cpu_descriptor[] = {
428	{ "mn103cpu", mn103cpu_finish, },
429	{ NULL },
430	};