375 lines
10 KiB
C
375 lines
10 KiB
C
/* The common simulator framework for GDB, the GNU Debugger.
|
|
|
|
Copyright 2002, 2007, 2008 Free Software Foundation, Inc.
|
|
|
|
Contributed by Andrew Cagney and Red Hat.
|
|
|
|
This file is part of GDB.
|
|
|
|
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 "hw-main.h"
|
|
|
|
#ifdef HAVE_STRING_H
|
|
#include <string.h>
|
|
#else
|
|
#ifdef HAVE_STRINGS_H
|
|
#include <strings.h>
|
|
#endif
|
|
#endif
|
|
|
|
/* DEVICE
|
|
|
|
|
|
glue - glue to interconnect and test hardware ports
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
|
|
The glue device provides two functions. Firstly, it provides a
|
|
mechanism for inspecting and driving the port network. Secondly,
|
|
it provides a set of boolean primitives that can be used to apply
|
|
combinatorial operations to the port network.
|
|
|
|
Glue devices have a variable number of big endian <<output>>
|
|
registers. Each register is target-word sized. The registers can
|
|
be read and written.
|
|
|
|
Writing to an output register results in an event being driven
|
|
(level determined by the value written) on the devices
|
|
corresponding output port.
|
|
|
|
Reading an <<output>> register returns either the last value
|
|
written or the most recently computed value (for that register) as
|
|
a result of an event ariving on that port (which ever was computed
|
|
last).
|
|
|
|
At present the following sub device types are available:
|
|
|
|
<<glue>>: In addition to driving its output interrupt port with any
|
|
value written to an interrupt input port is stored in the
|
|
corresponding <<output>> register. Such input interrupts, however,
|
|
are not propogated to an output interrupt port.
|
|
|
|
<<glue-and>>: The bit-wise AND of the interrupt inputs is computed
|
|
and then both stored in <<output>> register zero and propogated to
|
|
output interrupt output port zero.
|
|
|
|
|
|
PROPERTIES
|
|
|
|
|
|
reg = <address> <size> (required)
|
|
|
|
Specify the address (within the parent bus) that this device is to
|
|
live. The address must be 2048 * sizeof (word) (8k in a 32bit
|
|
simulation) aligned.
|
|
|
|
|
|
interrupt-ranges = <int-number> <range> (optional)
|
|
|
|
If present, this specifies the number of valid interrupt inputs (up
|
|
to the maximum of 2048). By default, <<int-number>> is zero and
|
|
range is determined by the <<reg>> size.
|
|
|
|
|
|
PORTS
|
|
|
|
|
|
int[0..] (input, output)
|
|
|
|
Both an input and an output port.
|
|
|
|
|
|
EXAMPLES
|
|
|
|
|
|
Enable tracing of the device:
|
|
|
|
| -t glue-device \
|
|
|
|
|
|
Create source, bitwize-and, and sink glue devices. Since the
|
|
device at address <<0x10000>> is of size <<8>> it will have two
|
|
output interrupt ports.
|
|
|
|
| -o '/iobus@0xf0000000/glue@0x10000/reg 0x10000 8' \
|
|
| -o '/iobus@0xf0000000/glue-and@0x20000/reg 0x20000 4' \
|
|
| -o '/iobus@0xf0000000/glue-and/interrupt-ranges 0 2' \
|
|
| -o '/iobus@0xf0000000/glue@0x30000/reg 0x30000 4' \
|
|
|
|
|
|
Wire the two source interrupts to the AND device:
|
|
|
|
| -o '/iobus@0xf0000000/glue@0x10000 > 0 0 /iobus/glue-and' \
|
|
| -o '/iobus@0xf0000000/glue@0x10000 > 1 1 /iobus/glue-and' \
|
|
|
|
|
|
Wire the AND device up to the sink so that the and's output is not
|
|
left open.
|
|
|
|
| -o '/iobus@0xf0000000/glue-and > 0 0 /iobus/glue@0x30000' \
|
|
|
|
|
|
With the above configuration. The client program is able to
|
|
compute a two bit AND. For instance the <<C>> stub below prints 1
|
|
AND 0.
|
|
|
|
| unsigned *input = (void*)0xf0010000;
|
|
| unsigned *output = (void*)0xf0030000;
|
|
| unsigned ans;
|
|
| input[0] = htonl(1);
|
|
| input[1] = htonl(0);
|
|
| ans = ntohl(*output);
|
|
| write_string("AND is ");
|
|
| write_int(ans);
|
|
| write_line();
|
|
|
|
|
|
BUGS
|
|
|
|
|
|
A future implementation of this device may support multiple
|
|
interrupt ranges.
|
|
|
|
Some of the devices listed may not yet be fully implemented.
|
|
|
|
Additional devices such as a D flip-flop (DFF), an inverter (INV)
|
|
or a latch (LAT) may prove useful.
|
|
|
|
*/
|
|
|
|
|
|
enum {
|
|
max_nr_ports = 2048,
|
|
};
|
|
|
|
enum hw_glue_type {
|
|
glue_undefined = 0,
|
|
glue_io,
|
|
glue_and,
|
|
glue_nand,
|
|
glue_or,
|
|
glue_xor,
|
|
glue_nor,
|
|
glue_not,
|
|
};
|
|
|
|
struct hw_glue {
|
|
enum hw_glue_type type;
|
|
int int_number;
|
|
int *input;
|
|
int nr_inputs;
|
|
unsigned sizeof_input;
|
|
/* our output registers */
|
|
int space;
|
|
unsigned_word address;
|
|
unsigned sizeof_output;
|
|
int *output;
|
|
int nr_outputs;
|
|
};
|
|
|
|
|
|
static hw_io_read_buffer_method hw_glue_io_read_buffer;
|
|
static hw_io_write_buffer_method hw_glue_io_write_buffer;
|
|
static hw_port_event_method hw_glue_port_event;
|
|
const static struct hw_port_descriptor hw_glue_ports[];
|
|
|
|
static void
|
|
hw_glue_finish (struct hw *me)
|
|
{
|
|
struct hw_glue *glue = HW_ZALLOC (me, struct hw_glue);
|
|
|
|
/* establish our own methods */
|
|
set_hw_data (me, glue);
|
|
set_hw_io_read_buffer (me, hw_glue_io_read_buffer);
|
|
set_hw_io_write_buffer (me, hw_glue_io_write_buffer);
|
|
set_hw_ports (me, hw_glue_ports);
|
|
set_hw_port_event (me, hw_glue_port_event);
|
|
|
|
/* attach to our parent bus */
|
|
do_hw_attach_regs (me);
|
|
|
|
/* establish the output registers */
|
|
{
|
|
reg_property_spec unit;
|
|
int reg_nr;
|
|
/* find a relevant reg entry */
|
|
reg_nr = 0;
|
|
while (hw_find_reg_array_property (me, "reg", reg_nr, &unit)
|
|
&& !hw_unit_size_to_attach_size (hw_parent (me),
|
|
&unit.size,
|
|
&glue->sizeof_output,
|
|
me))
|
|
reg_nr++;
|
|
/* check out the size */
|
|
if (glue->sizeof_output == 0)
|
|
hw_abort (me, "at least one reg property size must be nonzero");
|
|
if (glue->sizeof_output % sizeof (unsigned_word) != 0)
|
|
hw_abort (me, "reg property size must be %ld aligned",
|
|
(long) sizeof (unsigned_word));
|
|
/* and the address */
|
|
hw_unit_address_to_attach_address (hw_parent (me),
|
|
&unit.address,
|
|
&glue->space,
|
|
&glue->address,
|
|
me);
|
|
if (glue->address % (sizeof (unsigned_word) * max_nr_ports) != 0)
|
|
hw_abort (me, "reg property address must be %ld aligned",
|
|
(long) (sizeof (unsigned_word) * max_nr_ports));
|
|
glue->nr_outputs = glue->sizeof_output / sizeof (unsigned_word);
|
|
glue->output = hw_zalloc (me, glue->sizeof_output);
|
|
}
|
|
|
|
/* establish the input ports */
|
|
{
|
|
const struct hw_property *ranges;
|
|
ranges = hw_find_property (me, "interrupt-ranges");
|
|
if (ranges == NULL)
|
|
{
|
|
glue->int_number = 0;
|
|
glue->nr_inputs = glue->nr_outputs;
|
|
}
|
|
else if (ranges->sizeof_array != sizeof (unsigned_cell) * 2)
|
|
{
|
|
hw_abort (me, "invalid interrupt-ranges property (incorrect size)");
|
|
}
|
|
else
|
|
{
|
|
const unsigned_cell *int_range = ranges->array;
|
|
glue->int_number = BE2H_cell (int_range[0]);
|
|
glue->nr_inputs = BE2H_cell (int_range[1]);
|
|
}
|
|
glue->sizeof_input = glue->nr_inputs * sizeof (unsigned);
|
|
glue->input = hw_zalloc (me, glue->sizeof_input);
|
|
}
|
|
|
|
/* determine our type */
|
|
{
|
|
const char *name = hw_name(me);
|
|
if (strcmp (name, "glue") == 0)
|
|
glue->type = glue_io;
|
|
else if (strcmp (name, "glue-and") == 0)
|
|
glue->type = glue_and;
|
|
else
|
|
hw_abort (me, "unimplemented glue type");
|
|
}
|
|
|
|
HW_TRACE ((me, "int-number %d, nr_inputs %d, nr_outputs %d",
|
|
glue->int_number, glue->nr_inputs, glue->nr_outputs));
|
|
}
|
|
|
|
static unsigned
|
|
hw_glue_io_read_buffer (struct hw *me,
|
|
void *dest,
|
|
int space,
|
|
unsigned_word addr,
|
|
unsigned nr_bytes)
|
|
{
|
|
struct hw_glue *glue = (struct hw_glue *) hw_data (me);
|
|
int reg = ((addr - glue->address) / sizeof (unsigned_word)) % glue->nr_outputs;
|
|
if (nr_bytes != sizeof (unsigned_word)
|
|
|| (addr % sizeof (unsigned_word)) != 0)
|
|
hw_abort (me, "missaligned read access (%d:0x%lx:%d) not supported",
|
|
space, (unsigned long)addr, nr_bytes);
|
|
*(unsigned_word*)dest = H2BE_4(glue->output[reg]);
|
|
HW_TRACE ((me, "read - port %d (0x%lx), level %d",
|
|
reg, (unsigned long) addr, glue->output[reg]));
|
|
return nr_bytes;
|
|
}
|
|
|
|
|
|
static unsigned
|
|
hw_glue_io_write_buffer (struct hw *me,
|
|
const void *source,
|
|
int space,
|
|
unsigned_word addr,
|
|
unsigned nr_bytes)
|
|
{
|
|
struct hw_glue *glue = (struct hw_glue *) hw_data (me);
|
|
int reg = ((addr - glue->address) / sizeof (unsigned_word)) % max_nr_ports;
|
|
if (nr_bytes != sizeof (unsigned_word)
|
|
|| (addr % sizeof (unsigned_word)) != 0)
|
|
hw_abort (me, "missaligned write access (%d:0x%lx:%d) not supported",
|
|
space, (unsigned long) addr, nr_bytes);
|
|
glue->output[reg] = H2BE_4 (*(unsigned_word*)source);
|
|
HW_TRACE ((me, "write - port %d (0x%lx), level %d",
|
|
reg, (unsigned long) addr, glue->output[reg]));
|
|
hw_port_event (me, reg, glue->output[reg]);
|
|
return nr_bytes;
|
|
}
|
|
|
|
static void
|
|
hw_glue_port_event (struct hw *me,
|
|
int my_port,
|
|
struct hw *source,
|
|
int source_port,
|
|
int level)
|
|
{
|
|
struct hw_glue *glue = (struct hw_glue *) hw_data (me);
|
|
int i;
|
|
if (my_port < glue->int_number
|
|
|| my_port >= glue->int_number + glue->nr_inputs)
|
|
hw_abort (me, "port %d outside of valid range", my_port);
|
|
glue->input[my_port - glue->int_number] = level;
|
|
switch (glue->type)
|
|
{
|
|
case glue_io:
|
|
{
|
|
int port = my_port % glue->nr_outputs;
|
|
glue->output[port] = level;
|
|
HW_TRACE ((me, "input - port %d (0x%lx), level %d",
|
|
my_port,
|
|
(unsigned long) glue->address + port * sizeof (unsigned_word),
|
|
level));
|
|
break;
|
|
}
|
|
case glue_and:
|
|
{
|
|
glue->output[0] = glue->input[0];
|
|
for (i = 1; i < glue->nr_inputs; i++)
|
|
glue->output[0] &= glue->input[i];
|
|
HW_TRACE ((me, "and - port %d, level %d arrived - output %d",
|
|
my_port, level, glue->output[0]));
|
|
hw_port_event (me, 0, glue->output[0]);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
hw_abort (me, "operator not implemented");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static const struct hw_port_descriptor hw_glue_ports[] = {
|
|
{ "int", 0, max_nr_ports },
|
|
{ NULL }
|
|
};
|
|
|
|
|
|
const struct hw_descriptor dv_glue_descriptor[] = {
|
|
{ "glue", hw_glue_finish, },
|
|
{ "glue-and", hw_glue_finish, },
|
|
{ "glue-nand", hw_glue_finish, },
|
|
{ "glue-or", hw_glue_finish, },
|
|
{ "glue-xor", hw_glue_finish, },
|
|
{ "glue-nor", hw_glue_finish, },
|
|
{ "glue-not", hw_glue_finish, },
|
|
{ NULL },
|
|
};
|