From 9d18451b26939473f1d8ef38b1a24dba14428fff Mon Sep 17 00:00:00 2001
From: Alex <shadow8t4@tamu.edu>
Date: Mon, 19 Jun 2017 08:47:16 -0500
Subject: [PATCH] Finished constructor (hopefully) and header.

---
 MP2/MP2_Sources/cont_frame_pool.C | 62 ++++++++++++++++++++++++++++++-
 MP2/MP2_Sources/cont_frame_pool.H | 10 +++++
 2 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/MP2/MP2_Sources/cont_frame_pool.C b/MP2/MP2_Sources/cont_frame_pool.C
index 6ded45a..aeb5ec4 100644
--- a/MP2/MP2_Sources/cont_frame_pool.C
+++ b/MP2/MP2_Sources/cont_frame_pool.C
@@ -132,8 +132,66 @@ ContFramePool::ContFramePool(unsigned long _base_frame_no,
                              unsigned long _info_frame_no,
                              unsigned long _n_info_frames)
 {
-    // TODO: IMPLEMENTATION NEEEDED!
-    assert(false);
+    // Bitmap must fit in a single frame!
+    // NOTE: In theory, we don't need to make the bitmap any larger,
+    // since as stated in the instructions it is already big enough to
+    // hold for 128MB of memory with one bit per frame, so should still
+    // be enough for 64MB of memory with 2 bits per frame.
+    assert(_n_frames <= FRAME_SIZE * 8);
+    
+    base_frame_no = _base_frame_no;
+    nframes = _n_frames;
+    nFreeFrames = _n_frames;
+    info_frame_no = _info_frame_no;
+    n_info_frames = _n_info_frames;
+    
+    // If _info_frame_no is zero then we keep management info in the first
+    // frame(s), else we use the provided frame(s) to keep management info
+    // NOTE: need a second check for the number of info frames specified, if any.
+    if(info_frame_no == 0)
+    {
+        if(n_info_frames == 0)
+        {
+          bitmap = (unsigned char *) (base_frame_no * FRAME_SIZE);
+        }
+        else
+        {
+          bitmap = (unsigned char *) (base_frame_no * FRAME_SIZE * n_info_frames);
+        }
+    }
+    else
+    {
+        if(n_info_frames == 0)
+        {
+          bitmap = (unsigned char *) (info_frame_no * FRAME_SIZE);
+        }
+        else
+        {
+          bitmap = (unsigned char *) (info_frame_no * FRAME_SIZE * n_info_frames);
+        }
+    }
+    
+    // Number of frames must "fill" the bitmap!
+    assert ((nframes % 8 ) == 0);
+    
+    
+    // Everything ok. Proceed to mark all bits in the bitmap
+    // NOTE: I don't think this needs to be changed...
+    for(int i=0; i*8 < _n_frames; i++)
+    {
+        bitmap[i] = 0xFF;
+    }
+    
+    // Mark the first frame as being used if it is being used
+    // NOTE: need to mark multiple frames if needed.
+    unsigned long i = info_frame_no;
+    while(i < (info_frame_no + n_info_frames))
+    {
+        bitmap[i*8] = 0x7F;
+        nFreeFrames--;
+    }
+    
+    Console::puts("Frame Pool initialized\n");
 }
 
 unsigned long ContFramePool::get_frames(unsigned int _n_frames)
diff --git a/MP2/MP2_Sources/cont_frame_pool.H b/MP2/MP2_Sources/cont_frame_pool.H
index 115964c..54d7128 100755
--- a/MP2/MP2_Sources/cont_frame_pool.H
+++ b/MP2/MP2_Sources/cont_frame_pool.H
@@ -42,7 +42,17 @@ class ContFramePool {
     
 private:
     /* -- DEFINE YOUR CONT FRAME POOL DATA STRUCTURE(s) HERE. */
+   
+    unsigned char * bitmap;        // Remember the bitmap here needs 2 bits per frame
+    unsigned int    nFreeFrames;   //
+    unsigned long   base_frame_no; // Where does the frame pool start in phys mem?
+    unsigned long   nframes;       // Size of the frame pool
+    unsigned long   info_frame_no; // Where do we store the management information?
+    unsigned long   n_info_frames; // Number of frames needed to store management info
     
+    void mark_inaccessible(unsigned long _frame_no); // Should be a frame marked as
+                                                     // a head, otherwise fails
+   
 public:
 
     // The frame size is the same as the page size, duh...