dol/src/dol/visitor/cell/lib/spu/WindowedFifo.h

   1 #ifndef _WINDOWEDFIFO_H_
   2 #define _WINDOWEDFIFO_H_
   3
   4 #include <stdio.h>
   5 #include <string.h>
   6
   7 #include "../constant.h"
   8
   9 #include "../lib/malloc_align.h"
  10 #include "../lib/free_align.h"
  11
  12 class WindowedFifo {
  13     public:
  14         WindowedFifo(unsigned size);
  15         virtual ~WindowedFifo();
  16
  17         // Write
  18                 virtual unsigned reserve(char** destination, unsigned len);
  19         virtual void release();
  20
  21                 // Read
  22         virtual unsigned capture(char** destination, unsigned len);
  23         virtual void consume();
  24
  25                 // General functions
  26         virtual unsigned used() const;
  27         virtual unsigned unused() const;
  28         virtual unsigned size() const;
  29
  30                 // DMA functions
  31         virtual char *getQueuePointer();
  32         virtual void dmaRead(unsigned len);
  33         virtual unsigned dmaStart();
  34         virtual bool dmaAllowed();
  35                 virtual unsigned dmaWrite(const void *source, unsigned len);
  36
  37                 // Global variables
  38                 unsigned _inTail;
  39
  40     protected:
  41         char *_buffer;          // Pointer to the buffer
  42
  43                 unsigned _head;         // Current position of the head
  44         unsigned _tail;         // Current position of the tail
  45         unsigned _headRoom;     // HeadRoom pointer
  46         unsigned _tailRoom;     // Tailroom pointer
  47
  48                 unsigned _size;         // Total space of the buffer
  49         unsigned _use;          // How many data are used in the buffer
  50         unsigned _writeReserve; // Number of tokens one is writing
  51         unsigned _readReserve;  // Number of tokens one is reading
  52
  53                 bool _isHeadReserved;   // Head reserved?
  54         bool _isTailReserved;   // Tail reserved?
  55
  56                 unsigned _blocked;      // Blocked number the request has to wait
  57         bool _activeDMA;        // Is there an active DMA on this buffer
  58 };
  59
  60 #endif