malloc.c

The main purpose of this project is to add a new scheduling algorithm to GeekOS and to implement a s

/*
 * GeekOS memory allocation API
 * Copyright (c) 2001, David H. Hovemeyer <[e-mail]>
 * $Revision: 1.12 $
 * 
 * This is free software.  You are permitted to use,
 * redistribute, and modify it as specified in the file "COPYING".
 */

#include <geekos/screen.h>
#include <geekos/int.h>
#include <geekos/bget.h>
#include <geekos/kassert.h>
#include <geekos/malloc.h>

/*
 * Initialize the heap starting at given address and occupying
 * specified number of bytes.
 */
void Init_Heap(ulong_t start, ulong_t size)
{
    /*Print("Creating kernel heap: start=%lx, size=%ld\n", start, size);*/
    bpool((void*) start, size);
}

/*
 * Dynamically allocate a buffer of given size.
 * Returns null if there is not enough memory to satisfy the
 * allocation.
 */
void* Malloc(ulong_t size)
{
    void *result;
    bool iflag;

    KASSERT(size > 0);

    iflag = Begin_Int_Atomic();
    result = bget(size);
    End_Int_Atomic(iflag);

    return result;
}

/*
 * Free a buffer allocated with Malloc() or Malloc().
 */
void Free(void* buf)
{
    bool iflag;

    iflag = Begin_Int_Atomic();
    brel(buf);
    End_Int_Atomic(iflag);
}