New function hw_strdup() - use memory tied to hw device.

Tidy up hw-properties error messages.
New device dv-glue.c (copied from ../ppc/hw_glue.)
Only attach a port after a devices initialization has finished.

1 files changed, 380 insertions, 0 deletions

diff --git a/sim/common/dv-glue.c b/sim/common/dv-glue.c
new file mode 100644
index 0000000..070b638
--- /dev/null
+++ b/sim/common/dv-glue.c
@@ -0,0 +1,380 @@
+/*  This file is part of the program psim.
+    
+    Copyright (C) 1994-1996,1998 Andrew Cagney <cagney@highland.com.au>
+    
+    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 2 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, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+    
+    */
+
+
+#include "sim-main.h"
+#include "hw-base.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_callback hw_glue_io_read_buffer;
+static hw_io_write_buffer_callback hw_glue_io_write_buffer;
+static hw_port_event_callback 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 %d aligned",
+		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 %d aligned",
+		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,
+			sim_cpu *cpu,
+			sim_cia cia)
+{
+  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,
+			 sim_cpu *cpu,
+			 sim_cia cia)
+{
+  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], cpu, cia);
+  return nr_bytes;
+}
+
+static void
+hw_glue_port_event (struct hw *me,
+		    int my_port,
+		    struct hw *source,
+		    int source_port,
+		    int level,
+		    sim_cpu *cpu,
+		    sim_cia cia)
+{
+  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], cpu, cia);
+	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_device_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 },
+};