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-rw-r--r--sim/ppc/hw_glue.c371
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diff --git a/sim/ppc/hw_glue.c b/sim/ppc/hw_glue.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_GLUE_C_
-#define _HW_GLUE_C_
-
-#include "device_table.h"
-
-
-/* DEVICE
-
-
- glue - glue to interconnect and test interrupts
-
-
- DESCRIPTION
-
-
- The glue device provides two functions. Firstly, it provides a
- mechanism for inspecting and driving the interrupt net. Secondly,
- it provides a set of boolean primitives that can be used add
- combinatorial operations to the interrupt network.
-
- Glue devices have a variable number of big endian <<output>>
- registers. Each host-word size. The registers can be both read
- and written.
-
- Writing a value to an output register causes an interrupt (of the
- specified level) to be driven on the devices corresponding output
- interrupt 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 interrupt ariving (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.
-
-
- 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 dff, an inverter or a latch may be
- useful.
-
- */
-
-
-enum {
- max_nr_interrupts = 2048,
-};
-
-typedef enum _hw_glue_type {
- glue_undefined = 0,
- glue_io,
- glue_and,
- glue_nand,
- glue_or,
- glue_xor,
- glue_nor,
- glue_not,
-} hw_glue_type;
-
-typedef struct _hw_glue_device {
- 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;
-} hw_glue_device;
-
-
-static void
-hw_glue_init_address(device *me)
-{
- hw_glue_device *glue = (hw_glue_device*)device_data(me);
-
- /* attach to my parent */
- generic_device_init_address(me);
-
- /* establish the output registers */
- if (glue->output != NULL) {
- memset(glue->output, 0, glue->sizeof_output);
- }
- else {
- reg_property_spec unit;
- int reg_nr;
- /* find a relevant reg entry */
- reg_nr = 0;
- while (device_find_reg_array_property(me, "reg", reg_nr, &unit)
- && !device_size_to_attach_size(device_parent(me), &unit.size,
- &glue->sizeof_output, me))
- reg_nr++;
- /* check out the size */
- if (glue->sizeof_output == 0)
- device_error(me, "at least one reg property size must be nonzero");
- if (glue->sizeof_output % sizeof(unsigned_word) != 0)
- device_error(me, "reg property size must be %d aligned", sizeof(unsigned_word));
- /* and the address */
- device_address_to_attach_address(device_parent(me),
- &unit.address, &glue->space, &glue->address,
- me);
- if (glue->address % (sizeof(unsigned_word) * max_nr_interrupts) != 0)
- device_error(me, "reg property address must be %d aligned",
- sizeof(unsigned_word) * max_nr_interrupts);
- glue->nr_outputs = glue->sizeof_output / sizeof(unsigned_word);
- glue->output = zalloc(glue->sizeof_output);
- }
-
- /* establish the input interrupt ports */
- if (glue->input != NULL) {
- memset(glue->input, 0, glue->sizeof_input);
- }
- else {
- const device_property *ranges = device_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) {
- device_error(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 = zalloc(glue->sizeof_input);
- }
-
- /* determine our type */
- if (glue->type == glue_undefined) {
- const char *name = device_name(me);
- if (strcmp(name, "glue") == 0)
- glue->type = glue_io;
- else if (strcmp(name, "glue-and") == 0)
- glue->type = glue_and;
- else
- device_error(me, "unimplemented glue type");
- }
-
- DTRACE(glue, ("int-number %d, nr_inputs %d, nr_outputs %d\n",
- glue->int_number, glue->nr_inputs, glue->nr_outputs));
-}
-
-static unsigned
-hw_glue_io_read_buffer_callback(device *me,
- void *dest,
- int space,
- unsigned_word addr,
- unsigned nr_bytes,
- cpu *processor,
- unsigned_word cia)
-{
- hw_glue_device *glue = (hw_glue_device*)device_data(me);
- int reg = ((addr - glue->address) / sizeof(unsigned_word)) % glue->nr_outputs;
- if (nr_bytes != sizeof(unsigned_word)
- || (addr % sizeof(unsigned_word)) != 0)
- device_error(me, "missaligned read access (%d:0x%lx:%d) not supported",
- space, (unsigned long)addr, nr_bytes);
- *(unsigned_word*)dest = H2BE_4(glue->output[reg]);
- DTRACE(glue, ("read - interrupt %d (0x%lx), level %d\n",
- reg, (unsigned long) addr, glue->output[reg]));
- return nr_bytes;
-}
-
-
-static unsigned
-hw_glue_io_write_buffer_callback(device *me,
- const void *source,
- int space,
- unsigned_word addr,
- unsigned nr_bytes,
- cpu *processor,
- unsigned_word cia)
-{
- hw_glue_device *glue = (hw_glue_device*)device_data(me);
- int reg = ((addr - glue->address) / sizeof(unsigned_word)) % max_nr_interrupts;
- if (nr_bytes != sizeof(unsigned_word)
- || (addr % sizeof(unsigned_word)) != 0)
- device_error(me, "missaligned write access (%d:0x%lx:%d) not supported",
- space, (unsigned long)addr, nr_bytes);
- glue->output[reg] = H2BE_4(*(unsigned_word*)source);
- DTRACE(glue, ("write - interrupt %d (0x%lx), level %d\n",
- reg, (unsigned long) addr, glue->output[reg]));
- device_interrupt_event(me, reg, glue->output[reg], processor, cia);
- return nr_bytes;
-}
-
-static void
-hw_glue_interrupt_event(device *me,
- int my_port,
- device *source,
- int source_port,
- int level,
- cpu *processor,
- unsigned_word cia)
-{
- hw_glue_device *glue = (hw_glue_device*)device_data(me);
- int i;
- if (my_port < glue->int_number
- || my_port >= glue->int_number + glue->nr_inputs)
- device_error(me, "interrupt %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;
- DTRACE(glue, ("input - interrupt %d (0x%lx), level %d\n",
- 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];
- DTRACE(glue, ("and - interrupt %d, level %d arrived - output %d\n",
- my_port, level, glue->output[0]));
- device_interrupt_event(me, 0, glue->output[0], processor, cia);
- break;
- default:
- device_error(me, "operator not implemented");
- break;
- }
-}
-
-
-static const device_interrupt_port_descriptor hw_glue_interrupt_ports[] = {
- { "int", 0, max_nr_interrupts },
- { NULL }
-};
-
-
-static device_callbacks const hw_glue_callbacks = {
- { hw_glue_init_address, NULL },
- { NULL, }, /* address */
- { hw_glue_io_read_buffer_callback,
- hw_glue_io_write_buffer_callback, },
- { NULL, }, /* DMA */
- { hw_glue_interrupt_event, NULL, hw_glue_interrupt_ports }, /* interrupt */
- { NULL, }, /* unit */
- NULL, /* instance */
-};
-
-
-static void *
-hw_glue_create(const char *name,
- const device_unit *unit_address,
- const char *args)
-{
- /* create the descriptor */
- hw_glue_device *glue = ZALLOC(hw_glue_device);
- return glue;
-}
-
-
-const device_descriptor hw_glue_device_descriptor[] = {
- { "glue", hw_glue_create, &hw_glue_callbacks },
- { "glue-and", hw_glue_create, &hw_glue_callbacks },
- { "glue-nand", hw_glue_create, &hw_glue_callbacks },
- { "glue-or", hw_glue_create, &hw_glue_callbacks },
- { "glue-xor", hw_glue_create, &hw_glue_callbacks },
- { "glue-nor", hw_glue_create, &hw_glue_callbacks },
- { "glue-not", hw_glue_create, &hw_glue_callbacks },
- { NULL },
-};
-
-#endif /* _HW_GLUE_C_ */
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