packet.hh (9018:4fbbd05809d2) packet.hh (9030:047bd5f02c6e)
1/*
2 * Copyright (c) 2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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290 /// The address of the request. This address could be virtual or
291 /// physical, depending on the system configuration.
292 Addr addr;
293
294 /// The size of the request or transfer.
295 unsigned size;
296
297 /**
1/*
2 * Copyright (c) 2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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290 /// The address of the request. This address could be virtual or
291 /// physical, depending on the system configuration.
292 Addr addr;
293
294 /// The size of the request or transfer.
295 unsigned size;
296
297 /**
298 * Device address (e.g., bus ID) of the source of the
299 * transaction. The source is not responsible for setting this
300 * field; it is set implicitly by the interconnect when the packet
301 * is first sent.
298 * Source port identifier set on a request packet to enable
299 * appropriate routing of the responses. The source port
300 * identifier is set by any multiplexing component, e.g. a bus, as
301 * the timing responses need this information to be routed back to
302 * the appropriate port at a later point in time. The field can be
303 * updated (over-written) as the request packet passes through
304 * additional multiplexing components, and it is their
305 * responsibility to remember the original source port identifier,
306 * for example by using an appropriate sender state. The latter is
307 * done in the cache and bridge.
302 */
303 NodeID src;
304
305 /**
308 */
309 NodeID src;
310
311 /**
306 * Device address (e.g., bus ID) of the destination of the
307 * transaction. The special value Broadcast indicates that the
308 * packet should be routed based on its address. This field is
309 * initialized in the constructor and is thus always valid (unlike
310 * addr, size, and src).
312 * Destination port identifier that is present on all response
313 * packets that passed through a multiplexing component as a
314 * request packet. The source port identifier is turned into a
315 * destination port identifier when the packet is turned into a
316 * response, and the destination is used, e.g. by the bus, to
317 * select the appropriate path through the interconnect.
311 */
312 NodeID dest;
313
314 /**
315 * The original value of the command field. Only valid when the
316 * current command field is an error condition; in that case, the
317 * previous contents of the command field are copied here. This
318 * field is *not* set on non-error responses.

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522 assert(isLLSC());
523 assert(isRead());
524 cmd = MemCmd::ReadReq;
525 }
526
527 /**
528 * Constructor. Note that a Request object must be constructed
529 * first, but the Requests's physical address and size fields need
318 */
319 NodeID dest;
320
321 /**
322 * The original value of the command field. Only valid when the
323 * current command field is an error condition; in that case, the
324 * previous contents of the command field are copied here. This
325 * field is *not* set on non-error responses.

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529 assert(isLLSC());
530 assert(isRead());
531 cmd = MemCmd::ReadReq;
532 }
533
534 /**
535 * Constructor. Note that a Request object must be constructed
536 * first, but the Requests's physical address and size fields need
530 * not be valid. The command and destination addresses must be
531 * supplied.
537 * not be valid. The command must be supplied.
532 */
533 Packet(Request *_req, MemCmd _cmd)
534 : cmd(_cmd), req(_req), data(NULL),
535 bytesValidStart(0), bytesValidEnd(0),
536 time(curTick()), senderState(NULL)
537 {
538 if (req->hasPaddr()) {
539 addr = req->getPaddr();

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615 time = req->time();
616
617 flags.set(VALID_ADDR|VALID_SIZE);
618 deleteData();
619 }
620
621 /**
622 * Take a request packet and modify it in place to be suitable for
538 */
539 Packet(Request *_req, MemCmd _cmd)
540 : cmd(_cmd), req(_req), data(NULL),
541 bytesValidStart(0), bytesValidEnd(0),
542 time(curTick()), senderState(NULL)
543 {
544 if (req->hasPaddr()) {
545 addr = req->getPaddr();

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621 time = req->time();
622
623 flags.set(VALID_ADDR|VALID_SIZE);
624 deleteData();
625 }
626
627 /**
628 * Take a request packet and modify it in place to be suitable for
623 * returning as a response to that request. The source and
624 * destination fields are *not* modified, as is appropriate for
625 * atomic accesses.
629 * returning as a response to that request. The source field is
630 * turned into the destination, and subsequently cleared. Note
631 * that the latter is not necessary for atomic requests, but
632 * causes no harm as neither field is valid.
626 */
627 void
628 makeResponse()
629 {
630 assert(needsResponse());
631 assert(isRequest());
632 origCmd = cmd;
633 cmd = cmd.responseCommand();

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634 void
635 makeResponse()
636 {
637 assert(needsResponse());
638 assert(isRequest());
639 origCmd = cmd;
640 cmd = cmd.responseCommand();

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