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mem: Extend DRAM row bits from 16 to 32 for larger densities

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This patch extends the DRAM row bits to 32 to support larger density
memories. Additional checks are also added to ensure the row fits in
the 32 bits.
This commit is contained in:
Andreas Hansson 2014-06-30 13:56:01 -04:00
parent f34a8f0d61
commit d59bc8ee1f
2 changed files with 8 additions and 5 deletions
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7
src/mem/dram_ctrl.cc
View file

@ -215,7 +215,9 @@ DRAMCtrl::decodeAddr(PacketPtr pkt, Addr dramPktAddr, unsigned size,
// channel, respectively
uint8_t rank;
uint8_t bank;
uint16_t row;
// use a 64-bit unsigned during the computations as the row is
// always the top bits, and check before creating the DRAMPacket
uint64_t row;
// truncate the address to the access granularity
Addr addr = dramPktAddr / burstSize;
@ -294,6 +296,7 @@ DRAMCtrl::decodeAddr(PacketPtr pkt, Addr dramPktAddr, unsigned size,
assert(rank < ranksPerChannel);
assert(bank < banksPerRank);
assert(row < rowsPerBank);
assert(row < Bank::NO_ROW);
DPRINTF(DRAM, "Address: %lld Rank %d Bank %d Row %d\n",
dramPktAddr, rank, bank, row);
@ -750,7 +753,7 @@ DRAMCtrl::accessAndRespond(PacketPtr pkt, Tick static_latency)
void
DRAMCtrl::activateBank(Tick act_tick, uint8_t rank, uint8_t bank,
uint16_t row, Bank& bank_ref)
uint32_t row, Bank& bank_ref)
{
assert(0 <= rank && rank < ranksPerChannel);
assert(actTicks[rank].size() == activationLimit);

6
src/mem/dram_ctrl.hh
View file

@ -211,7 +211,7 @@ class DRAMCtrl : public AbstractMemory
/** Will be populated by address decoder */
const uint8_t rank;
const uint8_t bank;
const uint16_t row;
const uint32_t row;
/**
* Bank id is calculated considering banks in all the ranks
@ -242,7 +242,7 @@ class DRAMCtrl : public AbstractMemory
Bank& bankRef;
DRAMPacket(PacketPtr _pkt, bool is_read, uint8_t _rank, uint8_t _bank,
uint16_t _row, uint16_t bank_id, Addr _addr,
uint32_t _row, uint16_t bank_id, Addr _addr,
unsigned int _size, Bank& bank_ref)
: entryTime(curTick()), readyTime(curTick()),
pkt(_pkt), isRead(is_read), rank(_rank), bank(_bank), row(_row),
@ -394,7 +394,7 @@ class DRAMCtrl : public AbstractMemory
* @param bank_ref Reference to the bank
*/
void activateBank(Tick act_tick, uint8_t rank, uint8_t bank,
uint16_t row, Bank& bank_ref);
uint32_t row, Bank& bank_ref);
/**
* Precharge a given bank and also update when the precharge is