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gdb-msvc/sim/cris/dv-rv.c

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/* The remote-virtual-component simulator framework
for GDB, the GNU Debugger.
Copyright 2006-2020 Free Software Foundation, Inc.
This file is part of GDB.
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "sim-main.h"
#include "hw-main.h"
#include "hw-tree.h"
#include <ctype.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#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
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
/* Not guarded in dv-sockser.c, so why here. */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
/* DEVICE
rv - Remote Virtual component
DESCRIPTION
Socket connection to a remote simulator component, for example one
for testing a verilog construction. Protocol defined below.
There is a set of 32-bit I/O ports, with a mapping from local to
remote addresses. There is a set of interrupts expressed as a
bit-mask, with a mapping from remote to local. There is a set of
memory ranges (actual memory defined elsewhere), also with a
mapping from remote to local addresses, that is expected to be
accessible to the remote simulator in 32-byte chunks (simulating
DMA). There is a mapping from remote cycles (or an appropriate
elsewhere defined time-slice) to local cycles.
PROPERTIES
reg = <address> <size>
The address (within the parent bus) that this device is to
be located.
remote-reg = <remote-address>
The address of reg on the remote side. Defaults to 0.
mem = <address> <size>
Specify an address-range (within the parent bus) that the remote
device can access. The memory is assumed to be already defined.
If there's no memory defined but the remote side asks for a memory
access, the simulation is aborted.
remote-mem = <remote-address>
The address of mem on the remote side. Defaults to 0.
mbox = <address>
Address of the mailbox interface. Writes to this address with the
local address of a mailbox command, a complete packet with length
and command; (4 or 6)) invokes the mailbox interface. Reads are
invalid. Replies are written to the same address. Address space
from <address> up-to-and-including <address>+3 is allocated.
max-poll-ticks = <local-count>
Sets the maximum interval between polling the external component,
expressed in internal cycles. Defaults to 10000.
watchdog-interval = <seconds>
Sets the wallclock seconds between watchdog packets sent to the
remote side (may be larger if there's no rv activity in that time).
Defaults to 30. If set to 0, no watchdog packets are sent.
intnum = <local-int-0> <local-int-1> ... <local-int-31>
Defines a map from remote bit numbers to local values to be emitted
on the "int" port, with the external bit number as the ordinal - 1
of the local translation. E.g. 43 121 would mean map external
(1<<0) to internal 43 and external (1<<1) to internal 121. The
default is unity; no translation. If more than one bit is set in
the remote interrupt word, the intmultiple property can be used to
control the translation.
intmultiple = <intvalue>
When more than one bit is set in the remote interrupt word, you may
want to map this situation to a separate interrupt value. If this
property is non-zero, it is used as that value. If it is zero, the
local value for the "int" port is the bitwise-or of the translated
local values.
host = <hostid>
The hostname or address where the simulator to be used listens.
Defaults to "127.0.0.1"
port = <portnumber>
The hostname or address where the simulator to be used listens.
Defaults to 10000.
dummy = <value>
or
dummy = <filename>
Don't connect to a remote side; use initial dummy contents from
<filename> (which has to be at least as big as the <size> argument
of reg above) or filled with byte-value <value>. Mailboxes are not
supported (can be defined but can not be used) and remote-memory
accesses don't apply. The main purpose for this property is to
simplify use of configuration and simulated hardware that is
e.g. only trivially initialized but not actually used.
PORTS
int (output)
Driven as a result of a remote interrupt request. The value is a
32-bit bitset of active interrupts.
BUGS
All and none.
PROTOCOL
This is version 1.0 of this protocol, defining packet format and
actions in a supposedly upward-compatible manner where client and
servers of different versions are expected to interoperate; the
format and the definitions below are hopefully generic enough to
allow this.
Each connection has a server and a client (this code); the roles
are known beforehand. The client usually corresponds to a CPU and
memory system and the server corresponds to a memory-mapped
register hardware interface and/or a DMA controller. They
communicate using packets with specific commands, of which some
require replies from the other side; most are intiated by the
client with one exception. A reply uses the same format as the
command.
Packets are at least three bytes long, where the first two bytes
form a header, a 16-bit little-endian number that is the total
length of the packet including the header. There is also a
one-byte command. The payload is optional, depending on the
command.
[[16-bit-low-byte-of-length] [16-bit-high-byte-of-length]
[command/reply] [payload byte 0] [payload byte 1]
... [payload byte (length-of-packet - 3)]]
Commands:
A client or server that reads an undocumented command may exit with
a hard error. Payload not defined or disallowed below is ignored.
It is expected that future client versions find out the version of
the server side by polling with base commands, assuming earlier
versions if a certain reply isn't seen, with newly defined payload
parts where earlier versions left it undefined. New commands and
formats are sent only to the other side after the client and server
has found out each others version. Not all servers support all
commands; the type of server and supported set of commands is
expected to be known beforehand.
RV_READ_CMD = 0
Initiated by the client, requires a reply from the server. The
payload from the client is at least 4 bytes, forming a 4-byte
little-endian address, the rest being undefined. The reply from
the server is at least 8 bytes, forming the same address data as in
the request and the second 4-byte data being the little-endian
contents.
RV_WRITE_CMD = 1
Initiated by the client, requires a reply from the server. Payload
from the client is at least 8 bytes, forming a 4-byte little-endian
word being the address, the rest being the little-endian contents
to write. The reply from the server is 8 bytes unless elsewhere
agreed otherwise, forming the same address and data as in the
request. The data sent back may have been altered to correspond to
defined parts but can safely be discarded.
RV_IRQ_CMD = 2
Initiated by the server, no reply. The payload is 4 bytes, forming
a little-endian word with bits numbers corresponding to currently
active interrupt sources; value (1<<N) indicating interrupt source
N being active.
RV_MEM_RD_CMD = 3
Initiated by the server, requires a reply. A client must know
beforehand when (in command sequence or constant) the server can
send this command and if so must then not send any commands of its
own (including watchdog commands); the server is allowed to assume
that incoming data is only replies to this command. The format is
8 bytes of data; 4 bytes of little-endian address followed by a
32-bit little endian word with the number of bytes to read. The
reply is the same address and number of bytes, followed by the data
that had been read.
RV_MEM_WR_CMD = 4
Initiated by the server, no reply. The format is the same as a
reply to RV_MEM_RD_CMD; a 32-bit little-endian address, followed by
the 32-bit little-endian number of bytes to write (redundant
information but must be consistent with the packet header).
RV_MBOX_HANDLE_CMD = 5
Initiated by the client, requires a reply. The payload is 4
undefined bytes followed by an binary blob, the size of the
blob given by the packet header. The reply is a 32-bit little
endian number at the same index as the undefined bytes. Actual
semantics are application-specific.
RV_MBOX_PUT_CMD = 6
Initiated by the client, requires a reply, with the reply using the
RV_MBOX_HANDLE_CMD reply format (i.e. *both* that command and
32-bit little-endian number). The payload is a 32-bit little
endian number followed by an undefined payload, at most 20 bytes
long. The reply is a 32-bit little endian number. Actual
semantics are application-specific.
RV_WATCHDOG_CMD = 7
Initiated by the client, no reply. A version 1.0 client sends no
payload; a version 1.0 server should ignore any such payload. A
version 1.0 server must not send a reply.
Possible future enhancements:
Synchronization; server and client reports the number of elapsed
cycles (unit to-be-defined) at each request or notification.
Pretty much the top-of-the-todo-list item.
Large addresses; 1.0 being restricted to 32-bit addresses.
Variable-size data; currently restricted to 32-bit register
accesses.
Specified data endianness (not the packet header) perhaps as part
of an initial format request; currently little-endian only.
Usage notes:
When used with servers sending RV_MEM_RD_CMD but being
narrow-minded about indata, set watchdog-interval to 0. Use
multiple rv instances when there are e.g. separate register and
memory servers. Alway log, setting "/rv/trace? true", at the
development phase. Borrow from the test-suite.
*/
#define RV_FAMILY_NAME "rv"
enum rv_command {
RV_READ_CMD = 0,
RV_WRITE_CMD = 1,
RV_IRQ_CMD = 2,
RV_MEM_RD_CMD = 3,
RV_MEM_WR_CMD = 4,
RV_MBOX_HANDLE_CMD = 5,
RV_MBOX_PUT_CMD = 6,
RV_WATCHDOG_CMD = 7
};
typedef struct _hw_rv_device
{
/* Mapping of remote interrupt bit-numbers to local ones. */
unsigned32 remote_to_local_int[32];
/* When multiple bits are set, a non-zero value here indicates that
this value should be used instead. */
unsigned32 intmultiple;
/* Local address of registers. */
unsigned32 reg_address;
/* Size of register bank in bytes. */
unsigned32 reg_size;
/* Remote address of registers. */
unsigned32 remote_reg_address;
/* Local address of DMA:able memory. */
unsigned32 mem_address;
/* Size of DMA:able memory in bytes. */
unsigned32 mem_size;
/* Bitmask for valid DMA request size. */
unsigned32 mem_burst_mask;
/* Remote address of DMA:able memory. */
unsigned32 remote_mem_address;
/* (Local) address of mbox; where to put a pointer to the mbox to be
sent. */
unsigned32 mbox_address;
/* Probably not 127.0.0.1:10000. */
const char *host;
int port;
/* If non-NULL, points to memory to use instead of connection. */
unsigned8 *dummy;
/* File descriptor for the socket. Set to -1 when error. Only one
of dummy and this is active. */
int fd;
/* Stashed errno, as we don't emit an error right away. */
int saved_errno;
/* This, plus latency because the CPU might not be checking until a
CTI insn (usually a branch or a jump) is the interval in cycles
between the rv is polled for e.g. DMA requests. */
unsigned32 max_tick_poll_interval;
/* Running counter for exponential backoff up to
max_tick_poll_interval to avoid polling the connection
unnecessarily often. Set to 1 when rv activity (read/write
register, DMA request) is detected. */
unsigned32 next_period;
/* This is the interval in wall-clock seconds between watchdog
packets are sent to the remote side. Zero means no watchdog
packets. */
unsigned32 watchdog_interval;
/* Last time we sent a watchdog packet. */
struct timeval last_wdog_time;
/* Mostly used as a kludge for knowing which rv:s have poll events
active. */
struct hw_event *poll_callback;
} hw_rv_device;
/* We might add ports in the future, so keep this an enumeration. */
enum
{
INT_PORT
};
/* Our ports. */
static const struct hw_port_descriptor hw_rv_ports[] = {
{ "int", INT_PORT, 0, output_port },
{ NULL }
};
/* Send LEN bytes of data from BUF to the socket. Abort on
errors. */
static void
hw_rv_write (struct hw *me,
void *buf,
unsigned int len)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned8 *bufp = buf;
/* If we don't have a valid fd here, it's because we got an error
initially, and we suppressed that error. */
if (rv->fd == -1)
hw_abort (me, "couldn't open a connection to %s:%d because: %s",
rv->host, rv->port, strerror (rv->saved_errno));
while (len > 0)
{
ssize_t ret = write (rv->fd, bufp, len);
if (ret < 0)
/* FIXME: More graceful exit. */
hw_abort (me, "write to %s:%d failed: %s\n", rv->host, rv->port,
strerror (errno));
len -= ret;
bufp += ret;
}
}
/* Read LEN bytes of data into BUF from the socket. Set the file
descriptor to -1 if there's an error. */
static void
hw_rv_read (struct hw *me,
void *buf,
unsigned int len)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned8 *bufp = buf;
while (len > 0)
{
ssize_t ret = read (rv->fd, bufp, len);
/* We get all zero if the remote end quits, but no error
indication; even select says there's data active. */
if (ret <= 0)
{
if (close (rv->fd) != 0)
/* FIXME: More graceful exit. */
hw_abort (me, "read from %s:%d failed: %d\n", rv->host, rv->port, errno);
rv->fd = -1;
return;
}
len -= ret;
bufp += ret;
}
}
/* Construct and send a packet of data of type CMD and len
LEN_NOHEADER (not counting the header...). */
static void
hw_rv_send (struct hw *me,
unsigned int cmd,
void *msg,
unsigned int len_noheader)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned8 buf[32+3];
unsigned8 *bufp;
unsigned int len = len_noheader + 3;
int ret;
buf[0] = len & 255;
buf[1] = (len >> 8) & 255;
buf[2] = cmd;
if (len > sizeof (buf))
{
hw_rv_write (me, buf, 3);
len = len_noheader;
bufp = msg;
}
else
{
memcpy (buf + 3, msg, len_noheader);
bufp = buf;
}
hw_rv_write (me, bufp, len);
}
/* Handle incoming DMA requests as per the RV_MEM_RD_CMD packet.
Abort on errors. */
static void
hw_rv_read_mem (struct hw *me, unsigned int len)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
/* If you change this size, please adjust the mem2 testcase. */
unsigned8 buf[32+8];
unsigned8 *bufp = buf;
unsigned32 leaddr;
unsigned32 addr;
unsigned32 lelen;
unsigned32 i;
if (len != 8)
hw_abort (me, "expected DMA read request len 8+3, got %d+3", len);
hw_rv_read (me, &leaddr, 4);
hw_rv_read (me, &lelen, 4);
len = LE2H_4 (lelen);
addr = LE2H_4 (leaddr);
if (addr < rv->remote_mem_address
|| addr >= rv->remote_mem_address + rv->mem_size)
hw_abort (me, "DMA read at remote 0x%x; outside [0x%x..0x%x-1]",
(unsigned) addr, (unsigned) rv->remote_mem_address,
(unsigned) (rv->remote_mem_address + rv->mem_size));
addr = addr - rv->remote_mem_address + rv->mem_address;
if (len == 0)
hw_abort (me, "DMA read request for 0 bytes isn't supported");
if (len & ~rv->mem_burst_mask)
hw_abort (me, "DMA trying to read %d bytes; not matching mask of 0x%x",
len, rv->mem_burst_mask);
if (len + 8 > sizeof (buf))
bufp = hw_malloc (me, len + 8);
HW_TRACE ((me, "DMA R 0x%x..0x%x", addr, addr + len -1));
hw_dma_read_buffer (me, bufp + 8, 0, addr, len);
if (hw_trace_p (me))
for (i = 0; i < len; i += 4)
HW_TRACE ((me, "0x%x: %02x %02x %02x %02x",
addr + i,
bufp[i+8], bufp[i+9], bufp[i+10], bufp[i+11]));
memcpy (bufp, &leaddr, 4);
memcpy (bufp + 4, &lelen, 4);
hw_rv_send (me, RV_MEM_RD_CMD, bufp, len + 8);
if (bufp != buf)
hw_free (me, bufp);
}
/* Handle incoming DMA requests as per the RV_MEM_WR_CMD packet.
Abort on errors. */
static void
hw_rv_write_mem (struct hw *me, unsigned int plen)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
/* If you change this size, please adjust the mem2 testcase. */
unsigned8 buf[32+8];
unsigned8 *bufp = buf;
unsigned32 leaddr;
unsigned32 addr;
unsigned32 lelen;
unsigned32 len;
unsigned32 i;
hw_rv_read (me, &leaddr, 4);
hw_rv_read (me, &lelen, 4);
len = LE2H_4 (lelen);
addr = LE2H_4 (leaddr);
if (len != plen - 8)
hw_abort (me,
"inconsistency in DMA write request packet: "
"envelope %d+3, inner %d bytes", plen, len);
if (addr < rv->remote_mem_address
|| addr >= rv->remote_mem_address + rv->mem_size)
hw_abort (me, "DMA write at remote 0x%x; outside [0x%x..0x%x-1]",
(unsigned) addr, (unsigned) rv->remote_mem_address,
(unsigned) (rv->remote_mem_address + rv->mem_size));
addr = addr - rv->remote_mem_address + rv->mem_address;
if (len == 0)
hw_abort (me, "DMA write request for 0 bytes isn't supported");
if (len & ~rv->mem_burst_mask)
hw_abort (me, "DMA trying to write %d bytes; not matching mask of 0x%x",
len, rv->mem_burst_mask);
if (len + 8 > sizeof (buf))
bufp = hw_malloc (me, len + 8);
hw_rv_read (me, bufp + 8, len);
HW_TRACE ((me, "DMA W 0x%x..0x%x", addr, addr + len - 1));
hw_dma_write_buffer (me, bufp + 8, 0, addr, len, 0);
if (hw_trace_p (me))
for (i = 0; i < len; i += 4)
HW_TRACE ((me, "0x%x: %02x %02x %02x %02x",
addr + i,
bufp[i+8], bufp[i+9], bufp[i+10], bufp[i+11]));
if (bufp != buf)
hw_free (me, bufp);
}
static void
hw_rv_irq (struct hw *me, unsigned int len)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned32 intbitsle;
unsigned32 intbits_ext;
unsigned32 intval = 0;
int i;
if (len != 4)
hw_abort (me, "IRQ with %d data not supported", len);
hw_rv_read (me, &intbitsle, 4);
intbits_ext = LE2H_4 (intbitsle);
for (i = 0; i < 32; i++)
if ((intbits_ext & (1 << i)) != 0)
intval |= rv->remote_to_local_int[i];
if ((intbits_ext & ~(intbits_ext - 1)) != intbits_ext
&& rv->intmultiple != 0)
intval = rv->intmultiple;
HW_TRACE ((me, "IRQ 0x%x", intval));
hw_port_event (me, INT_PORT, intval);
}
/* Handle incoming interrupt notifications as per the RV_IRQ_CMD
packet. Abort on errors. */
static void
hw_rv_handle_incoming (struct hw *me,
int expected_type,
unsigned8 *buf,
unsigned int *return_len)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned8 cbuf[32];
unsigned int len;
unsigned int cmd;
while (1)
{
hw_rv_read (me, cbuf, 3);
if (rv->fd == -1)
return;
len = cbuf[0] + cbuf[1] * 256 - 3;
cmd = cbuf[2];
/* These come in "asynchronously"; not as a reply. */
switch (cmd)
{
case RV_IRQ_CMD:
hw_rv_irq (me, len);
break;
case RV_MEM_RD_CMD:
hw_rv_read_mem (me, len);
break;
case RV_MEM_WR_CMD:
hw_rv_write_mem (me, len);
break;
}
/* Something is incoming from the other side, so tighten up all
slack at the next wait. */
rv->next_period = 1;
switch (cmd)
{
case RV_MEM_RD_CMD:
case RV_MEM_WR_CMD:
case RV_IRQ_CMD:
/* Don't try to handle more than one of these if we were'nt
expecting a reply. */
if (expected_type == -1)
return;
continue;
}
/* Require a match between this supposed-reply and the command
for the rest. */
if (cmd != expected_type)
hw_abort (me, "unexpected reply, expected command %d, got %d",
expected_type, cmd);
switch (cmd)
{
case RV_MBOX_PUT_CMD:
case RV_MBOX_HANDLE_CMD:
case RV_WRITE_CMD:
case RV_READ_CMD:
hw_rv_read (me, buf, len <= *return_len ? len : *return_len);
*return_len = len;
break;
}
break;
}
}
/* Send a watchdog packet. Make a note of wallclock time. */
static void
hw_rv_send_wdog (struct hw *me)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
HW_TRACE ((me, "WD"));
gettimeofday (&rv->last_wdog_time, NULL);
hw_rv_send (me, RV_WATCHDOG_CMD, "", 0);
}
/* Poll the remote side: see if there's any incoming traffic; handle a
packet if so. Send a watchdog packet if it's time to do so.
Beware that the Linux select call indicates traffic for a socket
that the remote side has closed (which may be because it was
finished; don't hork until we need to write something just because
we're polling). */
static void
hw_rv_poll_once (struct hw *me)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
fd_set rfds;
fd_set efds;
struct timeval now;
int ret;
struct timeval tv;
if (rv->fd == -1)
/* Connection has died or was never initiated. */
return;
FD_ZERO (&rfds);
FD_SET (rv->fd, &rfds);
FD_ZERO (&efds);
FD_SET (rv->fd, &efds);
tv.tv_sec = 0;
tv.tv_usec = 0;
ret = select (rv->fd + 1, &rfds, NULL, &efds, &tv);
gettimeofday (&now, NULL);
if (ret < 0)
hw_abort (me, "select failed: %d\n", errno);
if (rv->watchdog_interval != 0
&& now.tv_sec - rv->last_wdog_time.tv_sec >= rv->watchdog_interval)
hw_rv_send_wdog (me);
if (FD_ISSET (rv->fd, &rfds))
hw_rv_handle_incoming (me, -1, NULL, NULL);
}
/* Initialize mapping of remote-to-local interrupt data. */
static void
hw_rv_map_ints (struct hw *me)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
int i;
for (i = 0; i < 32; i++)
rv->remote_to_local_int[i] = 1 << i;
if (hw_find_property (me, "intnum") != NULL)
for (i = 0; i < 32; i++)
{
signed_cell val = -1;
if (hw_find_integer_array_property (me, "intnum", i, &val) > 0)
{
if (val > 0)
rv->remote_to_local_int[i] = val;
else
hw_abort (me, "property \"intnum@%d\" must be > 0; is %d",
i, (int) val);
}
}
}
/* Handle the after-N-ticks "poll event", calling the poll-the-fd
method. Update the period. */
static void
do_poll_event (struct hw *me, void *data)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned32 new_period;
if (rv->dummy != NULL)
return;
hw_rv_poll_once (me);
if (rv->fd >= 0)
rv->poll_callback
= hw_event_queue_schedule (me, rv->next_period, do_poll_event, NULL);
new_period = rv->next_period * 2;
if (new_period <= rv->max_tick_poll_interval)
rv->next_period = new_period;
}
/* HW tree traverse function for hw_rv_add_init. */
static void
hw_rv_add_poller (struct hw *me, void *data)
{
hw_rv_device *rv;
if (hw_family (me) == NULL
|| strcmp (hw_family (me), RV_FAMILY_NAME) != 0)
return;
rv = (hw_rv_device *) hw_data (me);
if (rv->poll_callback != NULL)
return;
rv->poll_callback
= hw_event_queue_schedule (me, 1, do_poll_event, NULL);
}
/* Simulator module init function for hw_rv_add_init. */
/* FIXME: For the call so hw_tree_traverse, we need to know that the
first member of struct sim_hw is the struct hw *root, but there's
no accessor method and struct sim_hw is defined in sim-hw.c only.
Hence this hack, until an accessor is added, or there's a traverse
function that takes a SIM_DESC argument. */
struct sim_hw { struct hw *tree; };
static SIM_RC
hw_rv_add_rv_pollers (SIM_DESC sd)
{
hw_tree_traverse (STATE_HW (sd)->tree, hw_rv_add_poller, NULL, NULL);
return SIM_RC_OK;
}
/* We need to add events for polling, but we can't add one from the
finish-function, and there are no other call points, at least for
instances without "reg" (when there are just DMA requests from the
remote end; no locally initiated activity). Therefore we add a
simulator module init function, but those don't have private
payload arguments; just a SD argument. We cope by parsing the HW
root and making sure *all* "rv":s have poll callbacks installed.
Luckily, this is just an initialization step, and not many
simultaneous instances of rv are expected: we get a N**2 complexity
for visits to each rv node by this method. */
static void
hw_rv_add_init (struct hw *me)
{
sim_module_add_init_fn (hw_system (me), hw_rv_add_rv_pollers);
}
/* Open up a connection to the other side. Abort on errors. */
static void
hw_rv_init_socket (struct hw *me)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
int sock;
struct sockaddr_in server;
rv->fd = -1;
if (rv->dummy != NULL)
return;
memset (&server, 0, sizeof (server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr (rv->host);
/* Solaris 2.7 lacks this macro. */
#ifndef INADDR_NONE
#define INADDR_NONE -1
#endif
if (server.sin_addr.s_addr == INADDR_NONE)
{
struct hostent *h;
h = gethostbyname (rv->host);
if (h != NULL)
{
memcpy (&server.sin_addr, h->h_addr, h->h_length);
server.sin_family = h->h_addrtype;
}
else
hw_abort (me, "can't resolve host %s", rv->host);
}
server.sin_port = htons (rv->port);
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock == -1)
hw_abort (me, "can't get a socket for %s:%d connection",
rv->host, rv->port);
if (connect (sock, (struct sockaddr *) &server, sizeof server) >= 0)
{
rv->fd = sock;
/* FIXME: init packet here. Maybe start packet too. */
if (rv->watchdog_interval != 0)
hw_rv_send_wdog (me);
}
else
/* Stash the errno for later display, if some connection activity
is requested. Don't emit an error here; we might have been
called just for test purposes. */
rv->saved_errno = errno;
}
/* Local rv register reads end up here. */
static unsigned int
hw_rv_reg_read (struct hw *me,
void *dest,
int space,
unsigned_word addr,
unsigned int nr_bytes)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned8 addr_data[8] = "";
unsigned32 a_l = H2LE_4 (addr - rv->reg_address + rv->remote_reg_address);
unsigned int len = 8;
if (nr_bytes != 4)
hw_abort (me, "must be four byte read");
if (addr == rv->mbox_address)
hw_abort (me, "invalid read of mbox address 0x%x",
(unsigned) rv->mbox_address);
memcpy (addr_data, &a_l, 4);
HW_TRACE ((me, "REG R 0x%x", addr));
if (rv->dummy != NULL)
{
len = 8;
memcpy (addr_data + 4, rv->dummy + addr - rv->reg_address, 4);
}
else
{
hw_rv_send (me, RV_READ_CMD, addr_data, len);
hw_rv_handle_incoming (me, RV_READ_CMD, addr_data, &len);
}
if (len != 8)
hw_abort (me, "read %d != 8 bytes returned", len);
HW_TRACE ((me, ":= 0x%02x%02x%02x%02x",
addr_data[7], addr_data[6], addr_data[5], addr_data[4]));
memcpy (dest, addr_data + 4, 4);
return nr_bytes;
}
/* Local rv mbox requests (handle or put) end up here. */
static void
hw_rv_mbox (struct hw *me, unsigned_word address)
{
unsigned8 buf[256+3];
unsigned int cmd;
unsigned int rlen;
unsigned32 i;
unsigned int len
= hw_dma_read_buffer (me, buf, 0, address, 3);
if (len != 3)
hw_abort (me, "mbox read %d != 3 bytes returned", len);
cmd = buf[2];
if (cmd != RV_MBOX_HANDLE_CMD && cmd != RV_MBOX_PUT_CMD)
hw_abort (me, "unsupported mbox command %d", cmd);
len = buf[0] + buf[1]*256;
if (len > sizeof (buf))
hw_abort (me, "mbox cmd %d send size %d unsupported", cmd, len);
rlen = hw_dma_read_buffer (me, buf + 3, 0, address + 3, len - 3);
if (rlen != len - 3)
hw_abort (me, "mbox read %d != %d bytes returned", rlen, len - 3);
HW_TRACE ((me, "MBOX %s 0x%x..0x%x",
cmd == RV_MBOX_HANDLE_CMD ? "H" : "P",
address, address + len - 1));
for (i = 0; i < rlen; i += 8)
HW_TRACE ((me, "0x%x: %02x %02x %02x %02x %02x %02x %02x %02x",
address + 3 + i,
buf[3+i], buf[4+i], buf[5+i], buf[6+i], buf[7+i], buf[8+i],
buf[9+i], buf[10+i]));
len -= 3;
hw_rv_send (me, cmd, buf + 3, len);
/* Note: both ..._PUT and ..._HANDLE get the ..._HANDLE reply. */
hw_rv_handle_incoming (me, RV_MBOX_HANDLE_CMD, buf + 3, &len);
if (len > sizeof (buf))
hw_abort (me, "mbox cmd %d receive size %d unsupported", cmd, len);
HW_TRACE ((me, "-> 0x%x..0x%x", address, address + len + 3 - 1));
for (i = 0; i < len; i += 8)
HW_TRACE ((me, "0x%x: %02x %02x %02x %02x %02x %02x %02x %02x",
address + 3 + i,
buf[3+i], buf[4+i], buf[5+i], buf[6+i], buf[7+i], buf[8+i],
buf[9+i], buf[10+i]));
len += 3;
buf[0] = len & 255;
buf[1] = len / 256;
rlen = hw_dma_write_buffer (me, buf, 0, address, len, 0);
if (rlen != len)
hw_abort (me, "mbox write %d != %d bytes", rlen, len);
}
/* Local rv register writes end up here. */
static unsigned int
hw_rv_reg_write (struct hw *me,
const void *source,
int space,
unsigned_word addr,
unsigned int nr_bytes)
{
hw_rv_device *rv = (hw_rv_device *) hw_data (me);
unsigned8 addr_data[8] = "";
unsigned32 a_l = H2LE_4 (addr - rv->reg_address + rv->remote_reg_address);
unsigned int len = 8;
if (nr_bytes != 4)
hw_abort (me, "must be four byte write");
memcpy (addr_data, &a_l, 4);
memcpy (addr_data + 4, source, 4);
if (addr == rv->mbox_address)
{
unsigned32 mbox_addr_le;
if (rv->dummy != NULL)
hw_abort (me, "mbox not supported for a dummy instance");
memcpy (&mbox_addr_le, source, 4);
hw_rv_mbox (me, LE2H_4 (mbox_addr_le));
return nr_bytes;
}
HW_TRACE ((me, "REG W 0x%x := 0x%02x%02x%02x%02x", addr,
addr_data[7], addr_data[6], addr_data[5], addr_data[4]));
if (rv->dummy != NULL)
{
len = 8;
memcpy (rv->dummy + addr - rv->reg_address, addr_data + 4, 4);
}
else
{
hw_rv_send (me, RV_WRITE_CMD, addr_data, len);
hw_rv_handle_incoming (me, RV_WRITE_CMD, addr_data, &len);
}
if (len != 8)
hw_abort (me, "read %d != 8 bytes returned", len);
/* We had an access: tighten up all slack. */
rv->next_period = 1;
return nr_bytes;
}
/* Instance initializer function. */
static void
hw_rv_finish (struct hw *me)
{
hw_rv_device *rv = HW_ZALLOC (me, hw_rv_device);
int i;
const struct hw_property *mem_prop;
const struct hw_property *dummy_prop;
const struct hw_property *mbox_prop;
set_hw_data (me, rv);
#undef RV_GET_IPROP
#undef RV_GET_PROP
#define RV_GET_PROP(T, N, M, D) \
do \
{ \
if (hw_find_property (me, N) != NULL) \
rv->M = hw_find_ ## T ## _property (me, N); \
else \
rv->M = (D); \
} \
while (0)
#define RV_GET_IPROP(N, M, D) RV_GET_PROP (integer, N, M, D)
RV_GET_PROP (string, "host", host, "127.0.0.1");
RV_GET_IPROP ("port", port, 10000);
RV_GET_IPROP ("remote-reg", remote_reg_address, 0);
RV_GET_IPROP ("max-poll-ticks", max_tick_poll_interval, 10000);
RV_GET_IPROP ("watchdog-interval", watchdog_interval, 30);
RV_GET_IPROP ("remote-mem", remote_mem_address, 0);
RV_GET_IPROP ("mem-burst-mask", mem_burst_mask, 0xffff);
RV_GET_IPROP ("intmultiple", intmultiple, 0);
set_hw_io_read_buffer (me, hw_rv_reg_read);
set_hw_io_write_buffer (me, hw_rv_reg_write);
set_hw_ports (me, hw_rv_ports);
rv->next_period = 1;
/* FIXME: We only support zero or one reg and zero or one mem area. */
if (hw_find_property (me, "reg") != NULL)
{
reg_property_spec reg;
if (hw_find_reg_array_property (me, "reg", 0, &reg))
{
unsigned_word attach_address;
int attach_space;
unsigned int attach_size;
hw_unit_address_to_attach_address (hw_parent (me),
&reg.address,
&attach_space,
&attach_address,
me);
rv->reg_address = attach_address;
hw_unit_size_to_attach_size (hw_parent (me),
&reg.size,
&attach_size, me);
rv->reg_size = attach_size;
if ((attach_address & 3) != 0)
hw_abort (me, "register block must be 4 byte aligned");
hw_attach_address (hw_parent (me),
0,
attach_space, attach_address, attach_size,
me);
}
else
hw_abort (me, "property \"reg\" has the wrong type");
}
dummy_prop = hw_find_property (me, "dummy");
if (dummy_prop != NULL)
{
if (rv->reg_size == 0)
hw_abort (me, "dummy argument requires a \"reg\" property");
if (hw_property_type (dummy_prop) == integer_property)
{
unsigned32 dummyfill = hw_find_integer_property (me, "dummy");
unsigned8 *dummymem = hw_malloc (me, rv->reg_size);
memset (dummymem, dummyfill, rv->reg_size);
rv->dummy = dummymem;
}
else
{
const char *dummyarg = hw_find_string_property (me, "dummy");
unsigned8 *dummymem = hw_malloc (me, rv->reg_size);
FILE *f = fopen (dummyarg, "rb");
if (f == NULL)
hw_abort (me, "opening dummy-file \"%s\": %s",
dummyarg, strerror (errno));
if (fread (dummymem, 1, rv->reg_size, f) != rv->reg_size)
hw_abort (me, "reading dummy-file \"%s\": %s",
dummyarg, strerror (errno));
fclose (f);
rv->dummy = dummymem;
}
}
mbox_prop = hw_find_property (me, "mbox");
if (mbox_prop != NULL)
{
if (hw_property_type (mbox_prop) == integer_property)
{
signed_cell attach_address_sc
= hw_find_integer_property (me, "mbox");
rv->mbox_address = (unsigned32) attach_address_sc;
hw_attach_address (hw_parent (me),
0,
0, (unsigned32) attach_address_sc, 4, me);
}
else
hw_abort (me, "property \"mbox\" has the wrong type");
}
mem_prop = hw_find_property (me, "mem");
if (mem_prop != NULL)
{
signed_cell attach_address_sc;
signed_cell attach_size_sc;
/* Only specific names are reg_array_properties, the rest are
array_properties. */
if (hw_property_type (mem_prop) == array_property
&& hw_property_sizeof_array (mem_prop) == 2 * sizeof (attach_address_sc)
&& hw_find_integer_array_property (me, "mem", 0, &attach_address_sc)
&& hw_find_integer_array_property (me, "mem", 1, &attach_size_sc))
{
/* Unfortunate choice of types forces us to dance around a bit. */
rv->mem_address = (unsigned32) attach_address_sc;
rv->mem_size = (unsigned32) attach_size_sc;
if ((attach_address_sc & 3) != 0)
hw_abort (me, "memory block must be 4 byte aligned");
}
else
hw_abort (me, "property \"mem\" has the wrong type");
}
hw_rv_map_ints (me);
hw_rv_init_socket (me);
/* We need an extra initialization pass, after all others currently
scheduled (mostly, after the simulation events machinery has been
initialized so the events we want don't get thrown out). */
hw_rv_add_init (me);
}
/* Our root structure; see dv-* build machinery for usage. */
const struct hw_descriptor dv_rv_descriptor[] = {
{ RV_FAMILY_NAME, hw_rv_finish },
{ NULL }
};
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