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authorAndreas Hansson <andreas.hansson@arm.com>2013-01-07 13:05:39 -0500
committerAndreas Hansson <andreas.hansson@arm.com>2013-01-07 13:05:39 -0500
commit490dc30d9620891c54ddcd57c56adf092a71d79b (patch)
tree19d948e6fae6f9640569f12910be1050aff51339 /src
parent4c06be60fce383be08aaaf21fc4059dcc0f8a23a (diff)
downloadgem5-490dc30d9620891c54ddcd57c56adf092a71d79b.tar.xz
dev: Make the ethernet devices use a non-zero clock
This patch changes the NS gige controller to have a non-clock, and sets the default to 500 MHz. The blocks that could prevoiusly be by-passed with a zero clock are now always present, and the user is left with the option of setting a very high clock frequency to achieve a similar performance.
Diffstat (limited to 'src')
-rw-r--r--src/dev/Ethernet.py2
-rw-r--r--src/dev/ns_gige.cc38
-rw-r--r--src/dev/sinic.cc2
3 files changed, 19 insertions, 23 deletions
diff --git a/src/dev/Ethernet.py b/src/dev/Ethernet.py
index a8b5555d9..191aad3a1 100644
--- a/src/dev/Ethernet.py
+++ b/src/dev/Ethernet.py
@@ -138,7 +138,7 @@ class EtherDevBase(EtherDevice):
"Ethernet Hardware Address")
# Override the default clock
- clock = '0ns'
+ clock = '500MHz'
dma_read_delay = Param.Latency('0us', "fixed delay for dma reads")
dma_read_factor = Param.Latency('0us', "multiplier for dma reads")
diff --git a/src/dev/ns_gige.cc b/src/dev/ns_gige.cc
index 90eb14acd..9269f7935 100644
--- a/src/dev/ns_gige.cc
+++ b/src/dev/ns_gige.cc
@@ -1138,18 +1138,16 @@ NSGigE::rxKick()
uint32_t &extsts = is64bit ? rxDesc64.extsts : rxDesc32.extsts;
next:
- if (clock) {
- if (rxKickTick > curTick()) {
- DPRINTF(EthernetSM, "receive kick exiting, can't run till %d\n",
- rxKickTick);
+ if (rxKickTick > curTick()) {
+ DPRINTF(EthernetSM, "receive kick exiting, can't run till %d\n",
+ rxKickTick);
- goto exit;
- }
-
- // Go to the next state machine clock tick.
- rxKickTick = curTick() + clockPeriod();
+ goto exit;
}
+ // Go to the next state machine clock tick.
+ rxKickTick = clockEdge(Cycles(1));
+
switch(rxDmaState) {
case dmaReadWaiting:
if (doRxDmaRead())
@@ -1457,7 +1455,7 @@ NSGigE::rxKick()
DPRINTF(EthernetSM, "rx state machine exited rxState=%s\n",
NsRxStateStrings[rxState]);
- if (clock && !rxKickEvent.scheduled())
+ if (!rxKickEvent.scheduled())
schedule(rxKickEvent, rxKickTick);
}
@@ -1586,17 +1584,15 @@ NSGigE::txKick()
uint32_t &extsts = is64bit ? txDesc64.extsts : txDesc32.extsts;
next:
- if (clock) {
- if (txKickTick > curTick()) {
- DPRINTF(EthernetSM, "transmit kick exiting, can't run till %d\n",
- txKickTick);
- goto exit;
- }
-
- // Go to the next state machine clock tick.
- txKickTick = curTick() + clockPeriod();
+ if (txKickTick > curTick()) {
+ DPRINTF(EthernetSM, "transmit kick exiting, can't run till %d\n",
+ txKickTick);
+ goto exit;
}
+ // Go to the next state machine clock tick.
+ txKickTick = clockEdge(Cycles(1));
+
switch(txDmaState) {
case dmaReadWaiting:
if (doTxDmaRead())
@@ -1900,7 +1896,7 @@ NSGigE::txKick()
DPRINTF(EthernetSM, "tx state machine exited txState=%s\n",
NsTxStateStrings[txState]);
- if (clock && !txKickEvent.scheduled())
+ if (!txKickEvent.scheduled())
schedule(txKickEvent, txKickTick);
}
@@ -2015,7 +2011,7 @@ NSGigE::transferDone()
DPRINTF(Ethernet, "transfer complete: data in txFifo...schedule xmit\n");
- reschedule(txEvent, curTick() + clockPeriod(), true);
+ reschedule(txEvent, clockEdge(Cycles(1)), true);
}
bool
diff --git a/src/dev/sinic.cc b/src/dev/sinic.cc
index cfb7548eb..8cb7aada7 100644
--- a/src/dev/sinic.cc
+++ b/src/dev/sinic.cc
@@ -1159,7 +1159,7 @@ Device::transferDone()
DPRINTF(Ethernet, "transfer complete: data in txFifo...schedule xmit\n");
- reschedule(txEvent, curTick() + clockPeriod(), true);
+ reschedule(txEvent, clockEdge(Cycles(1)), true);
}
bool