374 lines
10 KiB
C
374 lines
10 KiB
C
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/* This file is part of the program psim.
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Copyright (C) 1994-1996,1998 Andrew Cagney <cagney@highland.com.au>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "hw-main.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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/* DEVICE
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glue - glue to interconnect and test hardware ports
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DESCRIPTION
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The glue device provides two functions. Firstly, it provides a
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mechanism for inspecting and driving the port network. Secondly,
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it provides a set of boolean primitives that can be used to apply
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combinatorial operations to the port network.
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Glue devices have a variable number of big endian <<output>>
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registers. Each register is target-word sized. The registers can
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be read and written.
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Writing to an output register results in an event being driven
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(level determined by the value written) on the devices
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corresponding output port.
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Reading an <<output>> register returns either the last value
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written or the most recently computed value (for that register) as
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a result of an event ariving on that port (which ever was computed
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last).
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At present the following sub device types are available:
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<<glue>>: In addition to driving its output interrupt port with any
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value written to an interrupt input port is stored in the
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corresponding <<output>> register. Such input interrupts, however,
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are not propogated to an output interrupt port.
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<<glue-and>>: The bit-wise AND of the interrupt inputs is computed
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and then both stored in <<output>> register zero and propogated to
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output interrupt output port zero.
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PROPERTIES
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reg = <address> <size> (required)
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Specify the address (within the parent bus) that this device is to
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live. The address must be 2048 * sizeof (word) (8k in a 32bit
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simulation) aligned.
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interrupt-ranges = <int-number> <range> (optional)
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If present, this specifies the number of valid interrupt inputs (up
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to the maximum of 2048). By default, <<int-number>> is zero and
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range is determined by the <<reg>> size.
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PORTS
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int[0..] (input, output)
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Both an input and an output port.
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EXAMPLES
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Enable tracing of the device:
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| -t glue-device \
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Create source, bitwize-and, and sink glue devices. Since the
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device at address <<0x10000>> is of size <<8>> it will have two
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output interrupt ports.
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| -o '/iobus@0xf0000000/glue@0x10000/reg 0x10000 8' \
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| -o '/iobus@0xf0000000/glue-and@0x20000/reg 0x20000 4' \
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| -o '/iobus@0xf0000000/glue-and/interrupt-ranges 0 2' \
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| -o '/iobus@0xf0000000/glue@0x30000/reg 0x30000 4' \
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Wire the two source interrupts to the AND device:
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| -o '/iobus@0xf0000000/glue@0x10000 > 0 0 /iobus/glue-and' \
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| -o '/iobus@0xf0000000/glue@0x10000 > 1 1 /iobus/glue-and' \
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Wire the AND device up to the sink so that the and's output is not
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left open.
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| -o '/iobus@0xf0000000/glue-and > 0 0 /iobus/glue@0x30000' \
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With the above configuration. The client program is able to
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compute a two bit AND. For instance the <<C>> stub below prints 1
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AND 0.
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| unsigned *input = (void*)0xf0010000;
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| unsigned *output = (void*)0xf0030000;
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| unsigned ans;
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| input[0] = htonl(1);
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| input[1] = htonl(0);
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| ans = ntohl(*output);
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| write_string("AND is ");
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| write_int(ans);
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| write_line();
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BUGS
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A future implementation of this device may support multiple
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interrupt ranges.
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Some of the devices listed may not yet be fully implemented.
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Additional devices such as a D flip-flop (DFF), an inverter (INV)
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or a latch (LAT) may prove useful.
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*/
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enum {
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max_nr_ports = 2048,
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};
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enum hw_glue_type {
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glue_undefined = 0,
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glue_io,
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glue_and,
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glue_nand,
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glue_or,
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glue_xor,
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glue_nor,
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glue_not,
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};
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struct hw_glue {
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enum hw_glue_type type;
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int int_number;
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int *input;
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int nr_inputs;
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unsigned sizeof_input;
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/* our output registers */
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int space;
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unsigned_word address;
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unsigned sizeof_output;
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int *output;
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int nr_outputs;
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};
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static hw_io_read_buffer_method hw_glue_io_read_buffer;
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static hw_io_write_buffer_method hw_glue_io_write_buffer;
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static hw_port_event_method hw_glue_port_event;
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const static struct hw_port_descriptor hw_glue_ports[];
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static void
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hw_glue_finish (struct hw *me)
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{
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struct hw_glue *glue = HW_ZALLOC (me, struct hw_glue);
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/* establish our own methods */
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set_hw_data (me, glue);
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set_hw_io_read_buffer (me, hw_glue_io_read_buffer);
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set_hw_io_write_buffer (me, hw_glue_io_write_buffer);
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set_hw_ports (me, hw_glue_ports);
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set_hw_port_event (me, hw_glue_port_event);
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/* attach to our parent bus */
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do_hw_attach_regs (me);
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/* establish the output registers */
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{
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reg_property_spec unit;
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int reg_nr;
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/* find a relevant reg entry */
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reg_nr = 0;
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while (hw_find_reg_array_property (me, "reg", reg_nr, &unit)
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&& !hw_unit_size_to_attach_size (hw_parent (me),
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&unit.size,
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&glue->sizeof_output,
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me))
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reg_nr++;
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/* check out the size */
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if (glue->sizeof_output == 0)
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hw_abort (me, "at least one reg property size must be nonzero");
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if (glue->sizeof_output % sizeof (unsigned_word) != 0)
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hw_abort (me, "reg property size must be %d aligned",
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sizeof (unsigned_word));
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/* and the address */
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hw_unit_address_to_attach_address (hw_parent (me),
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&unit.address,
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&glue->space,
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&glue->address,
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me);
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if (glue->address % (sizeof (unsigned_word) * max_nr_ports) != 0)
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hw_abort (me, "reg property address must be %d aligned",
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sizeof (unsigned_word) * max_nr_ports);
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glue->nr_outputs = glue->sizeof_output / sizeof (unsigned_word);
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glue->output = hw_zalloc (me, glue->sizeof_output);
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}
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/* establish the input ports */
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{
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const struct hw_property *ranges;
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ranges = hw_find_property (me, "interrupt-ranges");
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if (ranges == NULL)
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{
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glue->int_number = 0;
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glue->nr_inputs = glue->nr_outputs;
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}
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else if (ranges->sizeof_array != sizeof (unsigned_cell) * 2)
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{
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hw_abort (me, "invalid interrupt-ranges property (incorrect size)");
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}
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else
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{
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const unsigned_cell *int_range = ranges->array;
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glue->int_number = BE2H_cell (int_range[0]);
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glue->nr_inputs = BE2H_cell (int_range[1]);
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}
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glue->sizeof_input = glue->nr_inputs * sizeof (unsigned);
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glue->input = hw_zalloc (me, glue->sizeof_input);
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}
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/* determine our type */
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{
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const char *name = hw_name(me);
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if (strcmp (name, "glue") == 0)
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glue->type = glue_io;
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else if (strcmp (name, "glue-and") == 0)
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glue->type = glue_and;
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else
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hw_abort (me, "unimplemented glue type");
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}
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HW_TRACE ((me, "int-number %d, nr_inputs %d, nr_outputs %d",
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glue->int_number, glue->nr_inputs, glue->nr_outputs));
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}
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static unsigned
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hw_glue_io_read_buffer (struct hw *me,
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void *dest,
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int space,
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unsigned_word addr,
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unsigned nr_bytes)
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{
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struct hw_glue *glue = (struct hw_glue *) hw_data (me);
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int reg = ((addr - glue->address) / sizeof (unsigned_word)) % glue->nr_outputs;
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if (nr_bytes != sizeof (unsigned_word)
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|| (addr % sizeof (unsigned_word)) != 0)
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hw_abort (me, "missaligned read access (%d:0x%lx:%d) not supported",
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space, (unsigned long)addr, nr_bytes);
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*(unsigned_word*)dest = H2BE_4(glue->output[reg]);
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HW_TRACE ((me, "read - port %d (0x%lx), level %d",
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reg, (unsigned long) addr, glue->output[reg]));
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return nr_bytes;
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}
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static unsigned
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hw_glue_io_write_buffer (struct hw *me,
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const void *source,
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int space,
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unsigned_word addr,
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unsigned nr_bytes)
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{
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struct hw_glue *glue = (struct hw_glue *) hw_data (me);
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int reg = ((addr - glue->address) / sizeof (unsigned_word)) % max_nr_ports;
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if (nr_bytes != sizeof (unsigned_word)
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hw_abort (me, "missaligned write access (%d:0x%lx:%d) not supported",
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space, (unsigned long) addr, nr_bytes);
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glue->output[reg] = H2BE_4 (*(unsigned_word*)source);
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HW_TRACE ((me, "write - port %d (0x%lx), level %d",
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reg, (unsigned long) addr, glue->output[reg]));
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hw_port_event (me, reg, glue->output[reg]);
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return nr_bytes;
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}
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static void
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hw_glue_port_event (struct hw *me,
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int my_port,
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struct hw *source,
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int source_port,
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int level)
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{
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struct hw_glue *glue = (struct hw_glue *) hw_data (me);
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int i;
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if (my_port < glue->int_number
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|| my_port >= glue->int_number + glue->nr_inputs)
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hw_abort (me, "port %d outside of valid range", my_port);
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glue->input[my_port - glue->int_number] = level;
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switch (glue->type)
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{
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case glue_io:
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{
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int port = my_port % glue->nr_outputs;
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glue->output[port] = level;
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HW_TRACE ((me, "input - port %d (0x%lx), level %d",
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my_port,
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(unsigned long) glue->address + port * sizeof (unsigned_word),
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level));
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break;
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}
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case glue_and:
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{
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glue->output[0] = glue->input[0];
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for (i = 1; i < glue->nr_inputs; i++)
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glue->output[0] &= glue->input[i];
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HW_TRACE ((me, "and - port %d, level %d arrived - output %d",
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my_port, level, glue->output[0]));
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hw_port_event (me, 0, glue->output[0]);
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break;
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}
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default:
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{
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hw_abort (me, "operator not implemented");
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break;
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}
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}
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}
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static const struct hw_port_descriptor hw_glue_ports[] = {
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{ "int", 0, max_nr_ports },
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{ NULL }
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};
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const struct hw_descriptor dv_glue_descriptor[] = {
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{ "glue", hw_glue_finish, },
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{ "glue-and", hw_glue_finish, },
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{ "glue-nand", hw_glue_finish, },
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{ "glue-or", hw_glue_finish, },
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{ "glue-xor", hw_glue_finish, },
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{ "glue-nor", hw_glue_finish, },
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{ "glue-not", hw_glue_finish, },
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{ NULL },
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};
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