| Line 29... |
Line 29... |
#include <iostream>
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#include <iostream>
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#include <iomanip>
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#include <iomanip>
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#include "JtagDriverSC.h"
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#include "JtagDriverSC.h"
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SC_HAS_PROCESS (JtagDriverSC);
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SC_HAS_PROCESS (JtagDriverSC);
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//! Constructor for the JTAG driver.
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//! Constructor for the JTAG driver.
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//! We create a SC_THREAD in which we can spit out some actions. Must be a
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//! We create a SC_THREAD in which we can spit out some actions. Must be a
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| Line 41... |
Line 40... |
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//! @param[in] name Name of this module, passed to the parent
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//! @param[in] name Name of this module, passed to the parent
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//! constructor.
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//! constructor.
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//! @param[in] _tapActionQueue Pointer to fifo of actions to perform
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//! @param[in] _tapActionQueue Pointer to fifo of actions to perform
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JtagDriverSC::JtagDriverSC (sc_core::sc_module_name name,
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JtagDriverSC::JtagDriverSC(sc_core::sc_module_name name, sc_core::sc_fifo < TapAction * >*_tapActionQueue):
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sc_core::sc_fifo<TapAction *> *_tapActionQueue) :
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sc_module (name),
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sc_module (name),
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tapActionQueue (_tapActionQueue),
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tapActionQueue(_tapActionQueue), currentScanChain(OR1K_SC_UNDEF)
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currentScanChain (OR1K_SC_UNDEF)
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{
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{
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SC_THREAD (queueActions);
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SC_THREAD (queueActions);
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} // JtagDriverSC ()
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} // JtagDriverSC ()
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//! SystemC thread to queue some actions
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//! SystemC thread to queue some actions
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//! Have to use a thread, since we will end up waiting for actions to
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//! Have to use a thread, since we will end up waiting for actions to
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//! complete.
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//! complete.
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void
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void JtagDriverSC::queueActions()
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JtagDriverSC::queueActions ()
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{
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{
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uint32_t res; // General result variable
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uint32_t res; // General result variable
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// Reset the JTAG
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// Reset the JTAG
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reset ();
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reset ();
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| Line 70... |
Line 65... |
// Select the register scan chain to stall the processor, stall the
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// Select the register scan chain to stall the processor, stall the
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// processor and check it has stalled
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// processor and check it has stalled
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selectChain (OR1K_SC_REGISTER);
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selectChain (OR1K_SC_REGISTER);
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writeReg (OR1K_RSC_RISCOP, RISCOP_STALL);
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writeReg (OR1K_RSC_RISCOP, RISCOP_STALL);
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do
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do {
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{
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res = readReg (OR1K_RSC_RISCOP);
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res = readReg (OR1K_RSC_RISCOP);
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std::cout << sc_core::sc_time_stamp ().to_seconds () * 1000000
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std::cout << sc_core::sc_time_stamp ().to_seconds () * 1000000
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<< "us: RISCOP = " << std::hex << res << std::endl;
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<< "us: RISCOP = " << std::hex << res << std::endl;
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}
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}
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while ((res & RISCOP_STALL) != RISCOP_STALL);
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while ((res & RISCOP_STALL) != RISCOP_STALL);
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| Line 96... |
Line 90... |
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// Unstall and check it has unstalled
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// Unstall and check it has unstalled
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selectChain (OR1K_SC_REGISTER);
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selectChain (OR1K_SC_REGISTER);
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writeReg (OR1K_RSC_RISCOP, 0);
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writeReg (OR1K_RSC_RISCOP, 0);
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do
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do {
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{
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res = readReg (OR1K_RSC_RISCOP);
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res = readReg (OR1K_RSC_RISCOP);
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std::cout << sc_core::sc_time_stamp ().to_seconds () * 1000000
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std::cout << sc_core::sc_time_stamp ().to_seconds () * 1000000
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<< "us: RISCOP = " << std::hex << res << std::endl;
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<< "us: RISCOP = " << std::hex << res << std::endl;
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}
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}
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while ((res & RISCOP_STALL) == RISCOP_STALL);
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while ((res & RISCOP_STALL) == RISCOP_STALL);
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} // queueActions ()
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} // queueActions ()
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//! Reset the JTAG
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//! Reset the JTAG
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//! @note Must be called from a SystemC thread, because of the use of wait()
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//! @note Must be called from a SystemC thread, because of the use of wait()
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void
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void JtagDriverSC::reset()
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JtagDriverSC::reset ()
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{
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{
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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TapActionReset *resetAction;
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TapActionReset *resetAction;
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// Create and queue the reset action and wait for it to complete
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// Create and queue the reset action and wait for it to complete
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| Line 127... |
Line 118... |
delete resetAction;
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delete resetAction;
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delete actionDone;
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delete actionDone;
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} // reset ()
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} // reset ()
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//! Select an OpenRISC 1000 scan chain
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//! Select an OpenRISC 1000 scan chain
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//! Built on top of the JTAG commands to shift registers
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//! Built on top of the JTAG commands to shift registers
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//! We only do something if the scan chain needs to be changed.
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//! We only do something if the scan chain needs to be changed.
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//! - Shift-IR the CHAIN_SELECT instruction
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//! - Shift-IR the CHAIN_SELECT instruction
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| Line 140... |
Line 130... |
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//! @note Must be called from a SystemC thread, because of the use of wait()
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//! @note Must be called from a SystemC thread, because of the use of wait()
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//! @param[in] chain The desired scan chain
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//! @param[in] chain The desired scan chain
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void JtagDriverSC::selectChain(int chain)
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void
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JtagDriverSC::selectChain (int chain)
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{
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if (chain == currentScanChain)
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{
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{
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if (chain == currentScanChain) {
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return;
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return;
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}
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} else {
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else
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{
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currentScanChain = chain;
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currentScanChain = chain;
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}
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}
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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TapActionIRScan *iRScan;
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TapActionIRScan *iRScan;
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| Line 167... |
Line 152... |
delete iRScan;
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delete iRScan;
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// Create and queue the DR-Scan action for the specified chain (which we
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// Create and queue the DR-Scan action for the specified chain (which we
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// know will fit into 64 bits)
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// know will fit into 64 bits)
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uint64_t chainReg = crc8 (chain, CHAIN_DR_LEN) << (CHAIN_DR_LEN) | chain;
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uint64_t chainReg = crc8 (chain, CHAIN_DR_LEN) << (CHAIN_DR_LEN) | chain;
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dRScan = new TapActionDRScan (actionDone, chainReg, CHAIN_DR_LEN + CRC_LEN);
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dRScan =
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new TapActionDRScan(actionDone, chainReg, CHAIN_DR_LEN + CRC_LEN);
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tapActionQueue->write (dRScan);
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tapActionQueue->write (dRScan);
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wait (*actionDone);
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wait (*actionDone);
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delete dRScan;
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delete dRScan;
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| Line 183... |
Line 169... |
delete iRScan;
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delete iRScan;
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delete actionDone;
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delete actionDone;
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} // selectChain()
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} // selectChain()
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//! Read an OpenRISC 1000 JTAG register
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//! Read an OpenRISC 1000 JTAG register
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//! Built on top of the JTAG commands to shift registers
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//! Built on top of the JTAG commands to shift registers
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//! - Shift-DR the specified address with R/W field unset
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//! - Shift-DR the specified address with R/W field unset
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//! - read out the data shifted out.
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//! - read out the data shifted out.
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| Line 217... |
Line 202... |
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//! @param[in] addr The address of the register
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//! @param[in] addr The address of the register
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//! @return The register value read
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//! @return The register value read
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uint32_t
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uint32_t JtagDriverSC::readReg(uint32_t addr)
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JtagDriverSC::readReg (uint32_t addr)
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{
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{
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bool firstTime = true;
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bool firstTime = true;
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int bitSizeNoCrc; // Size of reg w/o its CRC field
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int bitSizeNoCrc; // Size of reg w/o its CRC field
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// Determine the size of register to read.
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// Determine the size of register to read.
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switch (currentScanChain)
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switch (currentScanChain) {
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{
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case OR1K_SC_RISC_DEBUG:
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case OR1K_SC_RISC_DEBUG:
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bitSizeNoCrc = RISC_DEBUG_DR_LEN;
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bitSizeNoCrc = RISC_DEBUG_DR_LEN;
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break;
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break;
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case OR1K_SC_REGISTER:
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case OR1K_SC_REGISTER:
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| Line 241... |
Line 224... |
break;
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break;
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}
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}
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// Read the register twice. Use an optimized version if the register is
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// Read the register twice. Use an optimized version if the register is
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// "small".
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// "small".
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if ((bitSizeNoCrc + CRC_LEN) < 64)
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if ((bitSizeNoCrc + CRC_LEN) < 64) {
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{
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(void)readReg1 (addr, bitSizeNoCrc);
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(void)readReg1 (addr, bitSizeNoCrc);
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return readReg1 (addr, bitSizeNoCrc);
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return readReg1 (addr, bitSizeNoCrc);
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}
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} else {
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else
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uint64_t *dReg =
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{
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new uint64_t[(bitSizeNoCrc + CRC_LEN + 63) / 64];
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uint64_t *dReg = new uint64_t [(bitSizeNoCrc + CRC_LEN + 63) / 64];
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(void)readReg1 (dReg, addr, bitSizeNoCrc);
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(void)readReg1 (dReg, addr, bitSizeNoCrc);
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uint32_t res = readReg1 (dReg, addr, bitSizeNoCrc);
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uint32_t res = readReg1 (dReg, addr, bitSizeNoCrc);
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delete [] dReg;
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delete [] dReg;
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return res;
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return res;
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}
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}
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} // readReg ()
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} // readReg ()
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//! Single read of an OpenRISC 1000 JTAG register
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//! Single read of an OpenRISC 1000 JTAG register
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//! Built on top of the JTAG commands to shift registers
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//! Built on top of the JTAG commands to shift registers
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//! - Shift-DR the specified address with R/W field unset
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//! - Shift-DR the specified address with R/W field unset
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//! - read out the data shifted out.
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//! - read out the data shifted out.
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| Line 273... |
Line 253... |
//! @param[in] addr The address to read
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//! @param[in] addr The address to read
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//! @param[in] bitSizeNoCrc Size of the register excluding its CRC field
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//! @param[in] bitSizeNoCrc Size of the register excluding its CRC field
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//! @return The register value read
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//! @return The register value read
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uint32_t
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uint32_t JtagDriverSC::readReg1(uint32_t addr, int bitSizeNoCrc)
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JtagDriverSC::readReg1 (uint32_t addr,
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int bitSizeNoCrc)
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{
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{
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// Useful fields and sizes and the register itself
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// Useful fields and sizes and the register itself
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int fullBitSize = bitSizeNoCrc + CRC_LEN;
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int fullBitSize = bitSizeNoCrc + CRC_LEN;
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int dataOffset = bitSizeNoCrc - DR_DATA_LEN;
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int dataOffset = bitSizeNoCrc - DR_DATA_LEN;
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uint64_t dReg;
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uint64_t dReg;
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// Allocate space for the shifted reg and a SystemC completion event
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// Allocate space for the shifted reg and a SystemC completion event
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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// Loop until CRCs match
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// Loop until CRCs match
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while (true)
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while (true) {
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{
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// Create the data to shift in
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// Create the data to shift in
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dReg = 0ULL;
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dReg = 0ULL;
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dReg |= addr;
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dReg |= addr;
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uint8_t crc_in = crc8 (dReg, bitSizeNoCrc);
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uint8_t crc_in = crc8 (dReg, bitSizeNoCrc);
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dReg |= (uint64_t)crc_in << bitSizeNoCrc;
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dReg |= (uint64_t)crc_in << bitSizeNoCrc;
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| Line 307... |
Line 284... |
// Check CRCs
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// Check CRCs
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uint8_t crc_out = dReg >> bitSizeNoCrc;
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uint8_t crc_out = dReg >> bitSizeNoCrc;
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uint8_t crc_calc = crc8 (dReg, bitSizeNoCrc);
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uint8_t crc_calc = crc8 (dReg, bitSizeNoCrc);
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// All done if CRC matches
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// All done if CRC matches
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if (crc_out == crc_calc)
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if (crc_out == crc_calc) {
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{
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delete actionDone;
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delete actionDone;
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return (dReg >> dataOffset) & ((1ULL << DR_DATA_LEN) - 1);
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return (dReg >> dataOffset) & ((1ULL << DR_DATA_LEN) -
|
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1);
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}
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}
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}
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}
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} // readReg1 ()
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} // readReg1 ()
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|
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//! Single read of an OpenRISC 1000 JTAG register
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//! Single read of an OpenRISC 1000 JTAG register
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|
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//! Built on top of the JTAG commands to shift registers
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//! Built on top of the JTAG commands to shift registers
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//! - Shift-DR the specified address with R/W field unset
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//! - Shift-DR the specified address with R/W field unset
|
//! - read out the data shifted out.
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//! - read out the data shifted out.
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| Line 334... |
Line 310... |
|
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//! @return The register value read
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//! @return The register value read
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|
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uint32_t
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uint32_t
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JtagDriverSC::readReg1 (uint64_t *dRegArray,
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JtagDriverSC::readReg1 (uint64_t *dRegArray,
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uint32_t addr,
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uint32_t addr, int bitSizeNoCrc)
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int bitSizeNoCrc)
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{
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{
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// Useful fields and sizes
|
// Useful fields and sizes
|
int fullBitSize = bitSizeNoCrc + CRC_LEN;
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int fullBitSize = bitSizeNoCrc + CRC_LEN;
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int dataOffset = bitSizeNoCrc - DR_DATA_LEN;
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int dataOffset = bitSizeNoCrc - DR_DATA_LEN;
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// Allocate a SystemC completion event
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// Allocate a SystemC completion event
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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sc_core::sc_event *actionDone = new sc_core::sc_event();
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// Loop until CRCs match
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// Loop until CRCs match
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while (true)
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while (true) {
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{
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// Create the data to shift in
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// Create the data to shift in
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memset (dRegArray, 0, fullBitSize / 8);
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memset (dRegArray, 0, fullBitSize / 8);
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dRegArray[0] |= addr;
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dRegArray[0] |= addr;
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uint8_t crc_in = crc8 (dRegArray, bitSizeNoCrc);
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uint8_t crc_in = crc8 (dRegArray, bitSizeNoCrc);
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insertBits (crc_in, CRC_LEN, dRegArray, bitSizeNoCrc);
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insertBits (crc_in, CRC_LEN, dRegArray, bitSizeNoCrc);
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// Prepare the action, queue it and wait for it to complete
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// Prepare the action, queue it and wait for it to complete
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TapActionDRScan *dRScan = new TapActionDRScan (actionDone, dRegArray,
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TapActionDRScan *dRScan =
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new TapActionDRScan(actionDone, dRegArray,
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fullBitSize);
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fullBitSize);
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tapActionQueue->write (dRScan);
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tapActionQueue->write (dRScan);
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wait (*actionDone);
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wait (*actionDone);
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dRScan->getDRegOut (dRegArray);
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dRScan->getDRegOut (dRegArray);
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delete dRScan;
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delete dRScan;
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| Line 366... |
Line 341... |
// Check CRCs
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// Check CRCs
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uint8_t crc_out = extractBits (dRegArray, bitSizeNoCrc, CRC_LEN);
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uint8_t crc_out = extractBits (dRegArray, bitSizeNoCrc, CRC_LEN);
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uint8_t crc_calc = crc8 (dRegArray, bitSizeNoCrc);
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uint8_t crc_calc = crc8 (dRegArray, bitSizeNoCrc);
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|
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// All done if CRC matches
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// All done if CRC matches
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if (crc_out == crc_calc)
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if (crc_out == crc_calc) {
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{
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delete actionDone;
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delete actionDone;
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return extractBits (dRegArray, dataOffset, DR_DATA_LEN);
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return extractBits (dRegArray, dataOffset, DR_DATA_LEN);
|
}
|
}
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}
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}
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} // readReg1 ()
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} // readReg1 ()
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//! Write an OpenRISC 1000 JTAG register
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//! Write an OpenRISC 1000 JTAG register
|
|
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//! Built on top of the JTAG commands to shift registers
|
//! Built on top of the JTAG commands to shift registers
|
//! - Shift-DR the specified address with R/W field set and data to write
|
//! - Shift-DR the specified address with R/W field set and data to write
|
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| Line 398... |
Line 371... |
|
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//! @param[in] addr The address of the register
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//! @param[in] addr The address of the register
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//! @param[in] data The register data to write
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//! @param[in] data The register data to write
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|
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void
|
void
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JtagDriverSC::writeReg (uint32_t addr,
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JtagDriverSC::writeReg(uint32_t addr, uint32_t data)
|
uint32_t data)
|
|
{
|
{
|
int bitSizeNoCrc; // Size of reg w/o its CRC field
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int bitSizeNoCrc; // Size of reg w/o its CRC field
|
uint64_t writeBit; // Mask for the write enable bit
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uint64_t writeBit; // Mask for the write enable bit
|
|
|
// Determine the size of register to write.
|
// Determine the size of register to write.
|
switch (currentScanChain)
|
switch (currentScanChain) {
|
{
|
|
case OR1K_SC_RISC_DEBUG:
|
case OR1K_SC_RISC_DEBUG:
|
bitSizeNoCrc = RISC_DEBUG_DR_LEN;
|
bitSizeNoCrc = RISC_DEBUG_DR_LEN;
|
writeBit = RISC_DEBUG_RW;
|
writeBit = RISC_DEBUG_RW;
|
break;
|
break;
|
|
|
| Line 447... |
Line 418... |
delete dRScan;
|
delete dRScan;
|
delete actionDone;
|
delete actionDone;
|
|
|
} // writeReg ()
|
} // writeReg ()
|
|
|
|
|
//! Compute CRC-8-ATM
|
//! Compute CRC-8-ATM
|
|
|
//! The data is in a uint64_t, for which we use the first size bits to compute
|
//! The data is in a uint64_t, for which we use the first size bits to compute
|
//! the CRC.
|
//! the CRC.
|
|
|
| Line 463... |
Line 433... |
//! is correct!
|
//! is correct!
|
|
|
//! @param data The data whose CRC is desired
|
//! @param data The data whose CRC is desired
|
//! @param size The number of bits in the data
|
//! @param size The number of bits in the data
|
|
|
uint8_t
|
uint8_t JtagDriverSC::crc8(uint64_t data, int size)
|
JtagDriverSC::crc8 (uint64_t data,
|
|
int size)
|
|
{
|
{
|
uint8_t crc = 0;
|
uint8_t crc = 0;
|
|
|
for (int i = 0; i < size; i++)
|
for (int i = 0; i < size; i++) {
|
{
|
|
uint8_t d = data & 1; // Latest data bit
|
uint8_t d = data & 1; // Latest data bit
|
data >>= 1;
|
data >>= 1;
|
|
|
uint8_t oldCrc7 = (crc >> 7) & 1;
|
uint8_t oldCrc7 = (crc >> 7) & 1;
|
uint8_t oldCrc1 = (crc >> 1) & 1;
|
uint8_t oldCrc1 = (crc >> 1) & 1;
|
uint8_t oldCrc0 = (crc >> 0) & 1;
|
uint8_t oldCrc0 = (crc >> 0) & 1;
|
uint8_t newCrc2 = d ^ oldCrc1 ^ oldCrc7; // Why d?
|
uint8_t newCrc2 = d ^ oldCrc1 ^ oldCrc7; // Why d?
|
uint8_t newCrc1 = d ^ oldCrc0 ^ oldCrc7; // Why d?
|
uint8_t newCrc1 = d ^ oldCrc0 ^ oldCrc7; // Why d?
|
uint8_t newCrc0 = d ^ oldCrc7;
|
uint8_t newCrc0 = d ^ oldCrc7;
|
|
|
crc = ((crc << 1) & 0xf8) | (newCrc2 << 2) | (newCrc1 << 1) | newCrc0;
|
crc =
|
|
((crc << 1) & 0xf8) | (newCrc2 << 2) | (newCrc1 << 1) |
|
|
newCrc0;
|
}
|
}
|
|
|
return crc;
|
return crc;
|
|
|
} // crc8 ()
|
} // crc8 ()
|
|
|
|
|
//! Compute CRC-8-ATM
|
//! Compute CRC-8-ATM
|
|
|
//! The data is in an array of uint64_t, for which we use the first size bits
|
//! The data is in an array of uint64_t, for which we use the first size bits
|
//! to compute the CRC.
|
//! to compute the CRC.
|
|
|
| Line 504... |
Line 472... |
//! is correct!
|
//! is correct!
|
|
|
//! @param dataArray The array of data whose CRC is desired
|
//! @param dataArray The array of data whose CRC is desired
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//! @param size The number of bits in the data
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//! @param size The number of bits in the data
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uint8_t
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uint8_t JtagDriverSC::crc8(uint64_t dataArray[], int size)
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JtagDriverSC::crc8 (uint64_t dataArray[],
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int size)
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{
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{
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uint8_t crc = 0;
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uint8_t crc = 0;
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for (int i = 0; i < size; i++)
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for (int i = 0; i < size; i++) {
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{
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uint8_t d = (dataArray[i / 64] >> (i % 64)) & 1;
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uint8_t d = (dataArray[i / 64] >> (i % 64)) & 1;
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uint8_t oldCrc7 = (crc >> 7) & 1;
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uint8_t oldCrc7 = (crc >> 7) & 1;
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uint8_t oldCrc1 = (crc >> 1) & 1;
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uint8_t oldCrc1 = (crc >> 1) & 1;
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uint8_t oldCrc0 = (crc >> 0) & 1;
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uint8_t oldCrc0 = (crc >> 0) & 1;
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uint8_t newCrc2 = d ^ oldCrc1 ^ oldCrc7; // Why d?
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uint8_t newCrc2 = d ^ oldCrc1 ^ oldCrc7; // Why d?
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uint8_t newCrc1 = d ^ oldCrc0 ^ oldCrc7; // Why d?
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uint8_t newCrc1 = d ^ oldCrc0 ^ oldCrc7; // Why d?
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uint8_t newCrc0 = d ^ oldCrc7;
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uint8_t newCrc0 = d ^ oldCrc7;
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crc = ((crc << 1) & 0xf8) | (newCrc2 << 2) | (newCrc1 << 1) | newCrc0;
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crc =
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((crc << 1) & 0xf8) | (newCrc2 << 2) | (newCrc1 << 1) |
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newCrc0;
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}
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}
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return crc;
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return crc;
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} // crc8 ()
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} // crc8 ()
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//! Utility to insert a string of bits into array
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//! Utility to insert a string of bits into array
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//! This is a simple overwriting
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//! This is a simple overwriting
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//! @param str Bits to insert
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//! @param str Bits to insert
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//! @param strLen Number of bits to insert
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//! @param strLen Number of bits to insert
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//! @param array Array into which to insert
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//! @param array Array into which to insert
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//! @param startBit Offset at which to insert bits
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//! @param startBit Offset at which to insert bits
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void
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void JtagDriverSC::insertBits(uint64_t str,
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JtagDriverSC::insertBits (uint64_t str,
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int strLen, uint64_t * array, int startBit)
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int strLen,
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uint64_t *array,
|
|
int startBit)
|
|
{
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{
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int startWord = startBit / 64;
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int startWord = startBit / 64;
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int endWord = (startBit + strLen - 1) / 64;
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int endWord = (startBit + strLen - 1) / 64;
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startBit = startBit % 64;
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startBit = startBit % 64;
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| Line 556... |
Line 519... |
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array[startWord] &= ~startMask;
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array[startWord] &= ~startMask;
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array[startWord] |= str << startBit;
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array[startWord] |= str << startBit;
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// If we were all in one word, we can give up now.
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// If we were all in one word, we can give up now.
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if (startWord == endWord)
|
if (startWord == endWord) {
|
{
|
|
return;
|
return;
|
}
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}
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// Deal with the endWord. Get enough bits for the mask. No need to shift
|
// Deal with the endWord. Get enough bits for the mask. No need to shift
|
// these up - they're always at the bottom of the word
|
// these up - they're always at the bottom of the word
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int bitsToDo = (startBit + strLen) % 64;
|
int bitsToDo = (startBit + strLen) % 64;
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|
|
uint64_t endMask = (1ULL << bitsToDo) - 1ULL;
|
uint64_t endMask = (1ULL << bitsToDo) - 1ULL;
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| Line 572... |
Line 533... |
array[endWord] &= ~endMask;
|
array[endWord] &= ~endMask;
|
array[endWord] |= str >> (strLen - bitsToDo);
|
array[endWord] |= str >> (strLen - bitsToDo);
|
|
|
} // insertBits()
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} // insertBits()
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|
|
|
|
//! Utility to extract a string of bits from an array
|
//! Utility to extract a string of bits from an array
|
|
|
//! @param array Array from which to extract
|
//! @param array Array from which to extract
|
//! @param startBit Offset at which to extract bits
|
//! @param startBit Offset at which to extract bits
|
//! @param strLen Number of bits to extract
|
//! @param strLen Number of bits to extract
|
|
|
//! @return Extracted bits
|
//! @return Extracted bits
|
|
|
uint64_t
|
uint64_t JtagDriverSC::extractBits(uint64_t * array, int startBit, int strLen)
|
JtagDriverSC::extractBits (uint64_t *array,
|
|
int startBit,
|
|
int strLen)
|
|
{
|
{
|
int startWord = startBit / 64;
|
int startWord = startBit / 64;
|
int endWord = (startBit + strLen - 1) / 64;
|
int endWord = (startBit + strLen - 1) / 64;
|
|
|
startBit = startBit % 64;
|
startBit = startBit % 64;
|
| Line 597... |
Line 554... |
// right place
|
// right place
|
uint64_t startMask = ((1ULL << strLen) - 1ULL) << startBit;
|
uint64_t startMask = ((1ULL << strLen) - 1ULL) << startBit;
|
uint64_t res = (array[startWord] & startMask) >> startBit;
|
uint64_t res = (array[startWord] & startMask) >> startBit;
|
|
|
// If we were all in one word, we can give up now.
|
// If we were all in one word, we can give up now.
|
if (startWord == endWord)
|
if (startWord == endWord) {
|
{
|
|
return res;
|
return res;
|
}
|
}
|
|
|
// Deal with the endWord. Get enough bits for the mask. No need to shift
|
// Deal with the endWord. Get enough bits for the mask. No need to shift
|
// these up - they're always at the bottom of the word
|
// these up - they're always at the bottom of the word
|
int bitsToDo = (startBit + strLen) % 64;
|
int bitsToDo = (startBit + strLen) % 64;
|
uint64_t endMask = (1ULL << bitsToDo) - 1ULL;
|
uint64_t endMask = (1ULL << bitsToDo) - 1ULL;
|
|
|
