diff options
Diffstat (limited to 'src/dev/alpha/tsunami_io.hh')
| -rw-r--r-- | src/dev/alpha/tsunami_io.hh | 228 |
1 files changed, 14 insertions, 214 deletions
diff --git a/src/dev/alpha/tsunami_io.hh b/src/dev/alpha/tsunami_io.hh index 05c4ee910..b6d63322b 100644 --- a/src/dev/alpha/tsunami_io.hh +++ b/src/dev/alpha/tsunami_io.hh @@ -39,6 +39,8 @@ #include "base/range.hh" #include "dev/alpha/tsunami.hh" +#include "dev/intel_8254_timer.hh" +#include "dev/mc146818.hh" #include "dev/io_device.hh" #include "params/TsunamiIO.hh" #include "sim/eventq.hh" @@ -53,223 +55,19 @@ class TsunamiIO : public BasicPioDevice struct tm tm; protected: - /** Real-Time Clock (MC146818) */ - class RTC - { - private: - /** Event for RTC periodic interrupt */ - struct RTCEvent : public Event - { - /** A pointer back to tsunami to create interrupt the processor. */ - Tsunami* tsunami; - Tick interval; - - RTCEvent(Tsunami* t, Tick i); - - /** Schedule the RTC periodic interrupt */ - void scheduleIntr(); - - /** Event process to occur at interrupt*/ - virtual void process(); - - /** Event description */ - virtual const char *description() const; - }; - - private: - std::string _name; - const std::string &name() const { return _name; } - /** RTC periodic interrupt event */ - RTCEvent event; - - /** Current RTC register address/index */ - int addr; - - /** Data for real-time clock function */ - union { - uint8_t clock_data[10]; - - struct { - uint8_t sec; - uint8_t sec_alrm; - uint8_t min; - uint8_t min_alrm; - uint8_t hour; - uint8_t hour_alrm; - uint8_t wday; - uint8_t mday; - uint8_t mon; - uint8_t year; - }; - }; - - /** RTC status register A */ - uint8_t stat_regA; - - /** RTC status register B */ - uint8_t stat_regB; - - public: - RTC(const std::string &name, Tsunami* tsunami, - const TsunamiIOParams *params); - - /** RTC address port: write address of RTC RAM data to access */ - void writeAddr(const uint8_t data); - - /** RTC write data */ - void writeData(const uint8_t data); - - /** RTC read data */ - uint8_t readData(); - - /** - * Serialize this object to the given output stream. - * @param base The base name of the counter object. - * @param os The stream to serialize to. - */ - void serialize(const std::string &base, std::ostream &os); - - /** - * Reconstruct the state of this object from a checkpoint. - * @param base The base name of the counter object. - * @param cp The checkpoint use. - * @param section The section name of this object - */ - void unserialize(const std::string &base, Checkpoint *cp, - const std::string §ion); - }; - - /** Programmable Interval Timer (Intel 8254) */ - class PITimer + class RTC : public MC146818 { - /** Counter element for PIT */ - class Counter - { - /** Event for counter interrupt */ - class CounterEvent : public Event - { - private: - /** Pointer back to Counter */ - Counter* counter; - Tick interval; - - public: - CounterEvent(Counter*); - - /** Event process */ - virtual void process(); - - /** Event description */ - virtual const char *description() const; - - friend class Counter; - }; - - private: - std::string _name; - const std::string &name() const { return _name; } - - CounterEvent event; - - /** Current count value */ - uint16_t count; - - /** Latched count */ - uint16_t latched_count; - - /** Interrupt period */ - uint16_t period; - - /** Current mode of operation */ - uint8_t mode; - - /** Output goes high when the counter reaches zero */ - bool output_high; - - /** State of the count latch */ - bool latch_on; - - /** Set of values for read_byte and write_byte */ - enum {LSB, MSB}; - - /** Determine which byte of a 16-bit count value to read/write */ - uint8_t read_byte, write_byte; - - public: - Counter(const std::string &name); - - /** Latch the current count (if one is not already latched) */ - void latchCount(); - - /** Set the read/write mode */ - void setRW(int rw_val); - - /** Set operational mode */ - void setMode(int mode_val); - - /** Set count encoding */ - void setBCD(int bcd_val); - - /** Read a count byte */ - uint8_t read(); - - /** Write a count byte */ - void write(const uint8_t data); - - /** Is the output high? */ - bool outputHigh(); - - /** - * Serialize this object to the given output stream. - * @param base The base name of the counter object. - * @param os The stream to serialize to. - */ - void serialize(const std::string &base, std::ostream &os); - - /** - * Reconstruct the state of this object from a checkpoint. - * @param base The base name of the counter object. - * @param cp The checkpoint use. - * @param section The section name of this object - */ - void unserialize(const std::string &base, Checkpoint *cp, - const std::string §ion); - }; - - private: - std::string _name; - const std::string &name() const { return _name; } - - /** PIT has three seperate counters */ - Counter *counter[3]; - public: - /** Public way to access individual counters (avoid array accesses) */ - Counter counter0; - Counter counter1; - Counter counter2; - - PITimer(const std::string &name); - - /** Write control word */ - void writeControl(const uint8_t data); + Tsunami *tsunami; + RTC(const std::string &n, const TsunamiIOParams *p); - /** - * Serialize this object to the given output stream. - * @param base The base name of the counter object. - * @param os The stream to serialize to. - */ - void serialize(const std::string &base, std::ostream &os); - - /** - * Reconstruct the state of this object from a checkpoint. - * @param base The base name of the counter object. - * @param cp The checkpoint use. - * @param section The section name of this object - */ - void unserialize(const std::string &base, Checkpoint *cp, - const std::string §ion); + protected: + void handleEvent() + { + //Actually interrupt the processor here + tsunami->cchip->postRTC(); + } }; /** Mask of the PIC1 */ @@ -294,10 +92,12 @@ class TsunamiIO : public BasicPioDevice Tsunami *tsunami; /** Intel 8253 Periodic Interval Timer */ - PITimer pitimer; + Intel8254Timer pitimer; RTC rtc; + uint8_t rtcAddr; + /** The interval is set via two writes to the PIT. * This variable contains a flag as to how many writes have happened, and * the time so far. |