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#include "mem/ruby/system/DMASequencer.hh"
#include "mem/ruby/buffers/MessageBuffer.hh"
#include "mem/ruby/slicc_interface/AbstractController.hh"
/* SLICC generated types */
#include "mem/protocol/DMARequestMsg.hh"
#include "mem/protocol/DMARequestType.hh"
#include "mem/protocol/DMAResponseMsg.hh"
#include "mem/ruby/system/System.hh"
DMASequencer::DMASequencer(const string & name)
: RubyPort(name)
{
}
void DMASequencer::init(const vector<string> & argv)
{
m_version = -1;
m_controller = NULL;
for (size_t i=0;i<argv.size();i+=2) {
if (argv[i] == "controller")
m_controller = RubySystem::getController(argv[i+1]);
else if (argv[i] == "version")
m_version = atoi(argv[i+1].c_str());
}
assert(m_controller != NULL);
assert(m_version != -1);
m_mandatory_q_ptr = m_controller->getMandatoryQueue();
m_is_busy = false;
m_data_block_mask = ~ (~0 << RubySystem::getBlockSizeBits());
}
int64_t DMASequencer::makeRequest(const RubyRequest & request)
{
uint64_t paddr = request.paddr;
uint8_t* data = request.data;
int len = request.len;
bool write = false;
switch(request.type) {
case RubyRequestType_LD:
write = false;
break;
case RubyRequestType_ST:
write = true;
break;
case RubyRequestType_NULL:
case RubyRequestType_IFETCH:
case RubyRequestType_Locked_Read:
case RubyRequestType_Locked_Write:
case RubyRequestType_RMW_Read:
case RubyRequestType_RMW_Write:
case RubyRequestType_NUM:
assert(0);
}
assert(!m_is_busy); // only support one outstanding DMA request
m_is_busy = true;
active_request.start_paddr = paddr;
active_request.write = write;
active_request.data = data;
active_request.len = len;
active_request.bytes_completed = 0;
active_request.bytes_issued = 0;
active_request.id = makeUniqueRequestID();
DMARequestMsg msg;
msg.getPhysicalAddress() = Address(paddr);
msg.getLineAddress() = line_address(msg.getPhysicalAddress());
msg.getType() = write ? DMARequestType_WRITE : DMARequestType_READ;
msg.getOffset() = paddr & m_data_block_mask;
msg.getLen() = (msg.getOffset() + len) <= RubySystem::getBlockSizeBytes() ?
len :
RubySystem::getBlockSizeBytes() - msg.getOffset();
if (write) {
msg.getType() = DMARequestType_WRITE;
msg.getDataBlk().setData(data, msg.getOffset(), msg.getLen());
} else {
msg.getType() = DMARequestType_READ;
}
m_mandatory_q_ptr->enqueue(msg);
active_request.bytes_issued += msg.getLen();
return active_request.id;
}
void DMASequencer::issueNext()
{
assert(m_is_busy == true);
active_request.bytes_completed = active_request.bytes_issued;
if (active_request.len == active_request.bytes_completed) {
m_hit_callback(active_request.id);
m_is_busy = false;
return;
}
DMARequestMsg msg;
msg.getPhysicalAddress() = Address(active_request.start_paddr +
active_request.bytes_completed);
assert((msg.getPhysicalAddress().getAddress() & m_data_block_mask) == 0);
msg.getLineAddress() = line_address(msg.getPhysicalAddress());
msg.getOffset() = 0;
msg.getType() = (active_request.write ? DMARequestType_WRITE :
DMARequestType_READ);
msg.getLen() = (active_request.len -
active_request.bytes_completed < RubySystem::getBlockSizeBytes() ?
active_request.len - active_request.bytes_completed :
RubySystem::getBlockSizeBytes());
if (active_request.write) {
msg.getDataBlk().setData(&active_request.data[active_request.bytes_completed],
0, msg.getLen());
msg.getType() = DMARequestType_WRITE;
} else {
msg.getType() = DMARequestType_READ;
}
m_mandatory_q_ptr->enqueue(msg);
active_request.bytes_issued += msg.getLen();
}
void DMASequencer::dataCallback(const DataBlock & dblk)
{
assert(m_is_busy == true);
int len = active_request.bytes_issued - active_request.bytes_completed;
int offset = 0;
if (active_request.bytes_completed == 0)
offset = active_request.start_paddr & m_data_block_mask;
assert( active_request.write == false );
memcpy(&active_request.data[active_request.bytes_completed],
dblk.getData(offset, len), len);
issueNext();
}
void DMASequencer::ackCallback()
{
issueNext();
}
void DMASequencer::printConfig(ostream & out)
{
}
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