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| -rw-r--r-- | sim/common/dv-glue.c | 380 |
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 }, +}; 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