1 files changed, 366 insertions, 0 deletions

diff --git a/sim/ppc/hw_pal.c b/sim/ppc/hw_pal.c
new file mode 100644
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+++ b/sim/ppc/hw_pal.c
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+/*  This file is part of the program psim.
+    
+    Copyright (C) 1994-1996, 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.
+    
+    */
+
+
+#ifndef _HW_PAL_C_
+#define _HW_PAL_C_
+
+#ifndef STATIC_INLINE_HW_PAL
+#define STATIC_INLINE_HW_PAL STATIC_INLINE
+#endif
+
+#include "device_table.h"
+
+#include "cpu.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#else
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+
+/* DEVICE
+
+   
+   pal - glue logic device containing assorted junk
+
+   
+   DESCRIPTION
+
+   
+   Typical hardware dependant hack.  This device allows the firmware
+   to gain access to all the things the firmware needs (but the OS
+   doesn't).
+
+   The pal contains the following registers.  Except for the interrupt
+   level register, each of the below is 8 bytes in size and must be
+   accessed using correct alignment.  For 16 and 32 bit accesses the
+   bytes not directed to the register are ignored:
+   
+   |0	reset register (write)
+   |4	processor id register (read)
+   |8	interrupt port (write)
+   |9	interrupt level (write)
+   |12	processor count register (read)
+   |16	tty input fifo register (read)
+   |20	tty input status register (read)
+   |24	tty output fifo register (write)
+   |28	tty output status register (read)
+
+   Reset register (write) halts the simulator exiting with the
+   value written.
+   
+   Processor id register (read) returns the processor number (0
+   .. N-1) of the processor performing the read.
+   
+   The interrupt registers should be accessed as a pair (using a 16 or
+   32 bit store).  The low byte specifies the interrupt port while the
+   high byte specifies the level to drive that port at.  By
+   convention, the pal's interrupt ports (int0, int1, ...) are wired
+   up to the corresponding processor's level sensative external
+   interrupt pin.  Eg: A two byte write to address 8 of 0x0102
+   (big-endian) will result in processor 2's external interrupt pin to
+   be asserted.
+
+   Processor count register (read) returns the total number of
+   processors active in the current simulation.
+
+   TTY input fifo register (read), if the TTY input status register
+   indicates a character is available by being nonzero, returns the
+   next available character from the pal's tty input port.
+
+   Similarly, the TTY output fifo register (write), if the TTY output
+   status register indicates the output fifo is not full by being
+   nonzero, outputs the character written to the tty's output port.
+
+
+   PROPERTIES
+   
+
+   reg = <address> <size> (required)
+
+   Specify the address (within the parent bus) that this device is to
+   live.
+
+
+   */
+
+
+enum {
+  hw_pal_reset_register = 0x0,
+  hw_pal_cpu_nr_register = 0x4,
+  hw_pal_int_register = 0x8,
+  hw_pal_nr_cpu_register = 0xa,
+  hw_pal_read_fifo = 0x10,
+  hw_pal_read_status = 0x14,
+  hw_pal_write_fifo = 0x18,
+  hw_pal_write_status = 0x1a,
+  hw_pal_address_mask = 0x1f,
+};
+
+
+typedef struct _hw_pal_console_buffer {
+  char buffer;
+  int status;
+} hw_pal_console_buffer;
+
+typedef struct _hw_pal_device {
+  hw_pal_console_buffer input;
+  hw_pal_console_buffer output;
+  device *disk;
+} hw_pal_device;
+
+
+/* check the console for an available character */
+static void
+scan_hw_pal(hw_pal_device *hw_pal)
+{
+  char c;
+  int count;
+  count = sim_io_read_stdin(&c, sizeof(c));
+  switch (count) {
+  case sim_io_not_ready:
+  case sim_io_eof:
+    hw_pal->input.buffer = 0;
+    hw_pal->input.status = 0;
+    break;
+  default:
+    hw_pal->input.buffer = c;
+    hw_pal->input.status = 1;
+  }
+}
+
+/* write the character to the hw_pal */
+static void
+write_hw_pal(hw_pal_device *hw_pal,
+	     char val)
+{
+  sim_io_write_stdout(&val, 1);
+  hw_pal->output.buffer = val;
+  hw_pal->output.status = 1;
+}
+
+
+static unsigned
+hw_pal_io_read_buffer_callback(device *me,
+			       void *dest,
+			       int space,
+			       unsigned_word addr,
+			       unsigned nr_bytes,
+			       cpu *processor,
+			       unsigned_word cia)
+{
+  hw_pal_device *hw_pal = (hw_pal_device*)device_data(me);
+  unsigned_1 val;
+  switch (addr & hw_pal_address_mask) {
+  case hw_pal_cpu_nr_register:
+    val = cpu_nr(processor);
+    DTRACE(pal, ("read - cpu-nr %d\n", val));
+    break;
+  case hw_pal_nr_cpu_register:
+    val = tree_find_integer_property(me, "/openprom/options/smp");
+    DTRACE(pal, ("read - nr-cpu %d\n", val));
+    break;
+  case hw_pal_read_fifo:
+    val = hw_pal->input.buffer;
+    DTRACE(pal, ("read - input-fifo %d\n", val));
+    break;
+  case hw_pal_read_status:
+    scan_hw_pal(hw_pal);
+    val = hw_pal->input.status;
+    DTRACE(pal, ("read - input-status %d\n", val));
+    break;
+  case hw_pal_write_fifo:
+    val = hw_pal->output.buffer;
+    DTRACE(pal, ("read - output-fifo %d\n", val));
+    break;
+  case hw_pal_write_status:
+    val = hw_pal->output.status;
+    DTRACE(pal, ("read - output-status %d\n", val));
+    break;
+  default:
+    val = 0;
+    DTRACE(pal, ("read - ???\n"));
+  }
+  memset(dest, 0, nr_bytes);
+  *(unsigned_1*)dest = val;
+  return nr_bytes;
+}
+
+
+static unsigned
+hw_pal_io_write_buffer_callback(device *me,
+				const void *source,
+				int space,
+				unsigned_word addr,
+				unsigned nr_bytes,
+				cpu *processor,
+				unsigned_word cia)
+{
+  hw_pal_device *hw_pal = (hw_pal_device*)device_data(me);
+  unsigned_1 *byte = (unsigned_1*)source;
+  
+  switch (addr & hw_pal_address_mask) {
+  case hw_pal_reset_register:
+    cpu_halt(processor, cia, was_exited, byte[0]);
+    break;
+  case hw_pal_int_register:
+    device_interrupt_event(me,
+			   byte[0], /*port*/
+			   (nr_bytes > 1 ? byte[1] : 0), /* val */
+			   processor, cia);
+    break;
+  case hw_pal_read_fifo:
+    hw_pal->input.buffer = byte[0];
+    DTRACE(pal, ("write - input-fifo %d\n", byte[0]));
+    break;
+  case hw_pal_read_status:
+    hw_pal->input.status = byte[0];
+    DTRACE(pal, ("write - input-status %d\n", byte[0]));
+    break;
+  case hw_pal_write_fifo:
+    write_hw_pal(hw_pal, byte[0]);
+    DTRACE(pal, ("write - output-fifo %d\n", byte[0]));
+    break;
+  case hw_pal_write_status:
+    hw_pal->output.status = byte[0];
+    DTRACE(pal, ("write - output-status %d\n", byte[0]));
+    break;
+  }
+  return nr_bytes;
+}
+
+
+/* instances of the hw_pal device */
+
+static void
+hw_pal_instance_delete_callback(device_instance *instance)
+{
+  /* nothing to delete, the hw_pal is attached to the device */
+  return;
+}
+
+static int
+hw_pal_instance_read_callback(device_instance *instance,
+			      void *buf,
+			      unsigned_word len)
+{
+  DITRACE(pal, ("read - %s (%ld)", (const char*)buf, (long int)len));
+  return sim_io_read_stdin(buf, len);
+}
+
+static int
+hw_pal_instance_write_callback(device_instance *instance,
+			       const void *buf,
+			       unsigned_word len)
+{
+  int i;
+  const char *chp = buf;
+  hw_pal_device *hw_pal = device_instance_data(instance);
+  DITRACE(pal, ("write - %s (%ld)", (const char*)buf, (long int)len));
+  for (i = 0; i < len; i++)
+    write_hw_pal(hw_pal, chp[i]);
+  sim_io_flush_stdoutput();
+  return i;
+}
+
+static const device_instance_callbacks hw_pal_instance_callbacks = {
+  hw_pal_instance_delete_callback,
+  hw_pal_instance_read_callback,
+  hw_pal_instance_write_callback,
+};
+
+static device_instance *
+hw_pal_create_instance(device *me,
+		       const char *path,
+		       const char *args)
+{
+  return device_create_instance_from(me, NULL,
+				     device_data(me),
+				     path, args,
+				     &hw_pal_instance_callbacks);
+}
+
+static const device_interrupt_port_descriptor hw_pal_interrupt_ports[] = {
+  { "int", 0, MAX_NR_PROCESSORS },
+  { NULL }
+};
+
+
+static void
+hw_pal_attach_address(device *me,
+		      attach_type attach,
+		      int space,
+		      unsigned_word addr,
+		      unsigned nr_bytes,
+		      access_type access,
+		      device *client)
+{
+  hw_pal_device *pal = (hw_pal_device*)device_data(me);
+  pal->disk = client;
+}
+
+
+static device_callbacks const hw_pal_callbacks = {
+  { generic_device_init_address, },
+  { hw_pal_attach_address, }, /* address */
+  { hw_pal_io_read_buffer_callback,
+      hw_pal_io_write_buffer_callback, },
+  { NULL, }, /* DMA */
+  { NULL, NULL, hw_pal_interrupt_ports }, /* interrupt */
+  { generic_device_unit_decode,
+    generic_device_unit_encode,
+    generic_device_address_to_attach_address,
+    generic_device_size_to_attach_size },
+  hw_pal_create_instance,
+};
+
+
+static void *
+hw_pal_create(const char *name,
+	      const device_unit *unit_address,
+	      const char *args)
+{
+  /* create the descriptor */
+  hw_pal_device *hw_pal = ZALLOC(hw_pal_device);
+  hw_pal->output.status = 1;
+  hw_pal->output.buffer = '\0';
+  hw_pal->input.status = 0;
+  hw_pal->input.buffer = '\0';
+  return hw_pal;
+}
+
+
+const device_descriptor hw_pal_device_descriptor[] = {
+  { "pal", hw_pal_create, &hw_pal_callbacks },
+  { NULL },
+};
+
+#endif /* _HW_PAL_C_ */