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1 24 jeremybenn
/*  This file is part of the program psim.
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    Copyright (C) 1994-1996, 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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#ifndef _HW_GLUE_C_
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#define _HW_GLUE_C_
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#include "device_table.h"
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/* DEVICE
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   glue - glue to interconnect and test interrupts
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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 interrupt net.  Secondly,
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   it provides a set of boolean primitives that can be used add
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   combinatorial operations to the interrupt network.
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   Glue devices have a variable number of big endian <<output>>
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   registers.  Each host-word size.  The registers can be both read
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   and written.
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   Writing a value to an output register causes an interrupt (of the
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   specified level) to be driven on the devices corresponding output
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   interrupt 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 interrupt ariving (which ever was computed 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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   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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113
   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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127
 
128
   BUGS
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131
   A future implementation of this device may support multiple
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   interrupt ranges.
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134
   Some of the devices listed may not yet be fully implemented.
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136
   Additional devices such as a dff, an inverter or a latch may be
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   useful.
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139
   */
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enum {
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  max_nr_interrupts = 2048,
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};
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146
typedef 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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} hw_glue_type;
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157
typedef struct _hw_glue_device {
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  hw_glue_type type;
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  int int_number;
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  int *input;
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  int nr_inputs;
162
  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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} hw_glue_device;
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171
 
172
static void
173
hw_glue_init_address(device *me)
174
{
175
  hw_glue_device *glue = (hw_glue_device*)device_data(me);
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177
  /* attach to my parent */
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  generic_device_init_address(me);
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180
  /* establish the output registers */
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  if (glue->output != NULL) {
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    memset(glue->output, 0, glue->sizeof_output);
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  }
184
  else {
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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 (device_find_reg_array_property(me, "reg", reg_nr, &unit)
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           && !device_size_to_attach_size(device_parent(me), &unit.size,
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                                          &glue->sizeof_output, 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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      device_error(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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      device_error(me, "reg property size must be %d aligned", sizeof(unsigned_word));
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    /* and the address */
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    device_address_to_attach_address(device_parent(me),
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                                     &unit.address, &glue->space, &glue->address,
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                                     me);
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    if (glue->address % (sizeof(unsigned_word) * max_nr_interrupts) != 0)
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      device_error(me, "reg property address must be %d aligned",
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                   sizeof(unsigned_word) * max_nr_interrupts);
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    glue->nr_outputs = glue->sizeof_output / sizeof(unsigned_word);
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    glue->output = zalloc(glue->sizeof_output);
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  }
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209
  /* establish the input interrupt ports */
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  if (glue->input != NULL) {
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    memset(glue->input, 0, glue->sizeof_input);
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  }
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  else {
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    const device_property *ranges = device_find_property(me, "interrupt-ranges");
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    if (ranges == NULL) {
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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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      device_error(me, "invalid interrupt-ranges property (incorrect size)");
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    }
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    else {
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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 = zalloc(glue->sizeof_input);
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  }
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  /* determine our type */
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  if (glue->type == glue_undefined) {
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    const char *name = device_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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      device_error(me, "unimplemented glue type");
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  }
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  DTRACE(glue, ("int-number %d, nr_inputs %d, nr_outputs %d\n",
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                glue->int_number, glue->nr_inputs, glue->nr_outputs));
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}
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static unsigned
247
hw_glue_io_read_buffer_callback(device *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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                                cpu *processor,
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                                unsigned_word cia)
254
{
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  hw_glue_device *glue = (hw_glue_device*)device_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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     device_error(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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  DTRACE(glue, ("read - interrupt %d (0x%lx), level %d\n",
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                reg, (unsigned long) addr, glue->output[reg]));
264
  return nr_bytes;
265
}
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static unsigned
269
hw_glue_io_write_buffer_callback(device *me,
270
                                 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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                                 cpu *processor,
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                                 unsigned_word cia)
276
{
277
  hw_glue_device *glue = (hw_glue_device*)device_data(me);
278
  int reg = ((addr - glue->address) / sizeof(unsigned_word)) % max_nr_interrupts;
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  if (nr_bytes != sizeof(unsigned_word)
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      || (addr % sizeof(unsigned_word)) != 0)
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    device_error(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);
284
  DTRACE(glue, ("write - interrupt %d (0x%lx), level %d\n",
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                reg, (unsigned long) addr, glue->output[reg]));
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  device_interrupt_event(me, reg, glue->output[reg], processor, cia);
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  return nr_bytes;
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}
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static void
291
hw_glue_interrupt_event(device *me,
292
                        int my_port,
293
                        device *source,
294
                        int source_port,
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                        int level,
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                        cpu *processor,
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                        unsigned_word cia)
298
{
299
  hw_glue_device *glue = (hw_glue_device*)device_data(me);
300
  int i;
301
  if (my_port < glue->int_number
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      || my_port >= glue->int_number + glue->nr_inputs)
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    device_error(me, "interrupt %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) {
306
  case glue_io:
307
    {
308
      int port = my_port % glue->nr_outputs;
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      glue->output[port] = level;
310
      DTRACE(glue, ("input - interrupt %d (0x%lx), level %d\n",
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                    my_port,
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                    (unsigned long)glue->address + port * sizeof(unsigned_word),
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                    level));
314
      break;
315
    }
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  case glue_and:
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    glue->output[0] = glue->input[0];
318
    for (i = 1; i < glue->nr_inputs; i++)
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      glue->output[0] &= glue->input[i];
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    DTRACE(glue, ("and - interrupt %d, level %d arrived - output %d\n",
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                  my_port, level, glue->output[0]));
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    device_interrupt_event(me, 0, glue->output[0], processor, cia);
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    break;
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  default:
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    device_error(me, "operator not implemented");
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    break;
327
  }
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}
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static const device_interrupt_port_descriptor hw_glue_interrupt_ports[] = {
332
  { "int", 0, max_nr_interrupts },
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  { NULL }
334
};
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static device_callbacks const hw_glue_callbacks = {
338
  { hw_glue_init_address, NULL },
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  { NULL, }, /* address */
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  { hw_glue_io_read_buffer_callback,
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      hw_glue_io_write_buffer_callback, },
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  { NULL, }, /* DMA */
343
  { hw_glue_interrupt_event, NULL, hw_glue_interrupt_ports }, /* interrupt */
344
  { NULL, }, /* unit */
345
  NULL, /* instance */
346
};
347
 
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349
static void *
350
hw_glue_create(const char *name,
351
              const device_unit *unit_address,
352
              const char *args)
353
{
354
  /* create the descriptor */
355
  hw_glue_device *glue = ZALLOC(hw_glue_device);
356
  return glue;
357
}
358
 
359
 
360
const device_descriptor hw_glue_device_descriptor[] = {
361
  { "glue", hw_glue_create, &hw_glue_callbacks },
362
  { "glue-and", hw_glue_create, &hw_glue_callbacks },
363
  { "glue-nand", hw_glue_create, &hw_glue_callbacks },
364
  { "glue-or", hw_glue_create, &hw_glue_callbacks },
365
  { "glue-xor", hw_glue_create, &hw_glue_callbacks },
366
  { "glue-nor", hw_glue_create, &hw_glue_callbacks },
367
  { "glue-not", hw_glue_create, &hw_glue_callbacks },
368
  { NULL },
369
};
370
 
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#endif /* _HW_GLUE_C_ */

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