Added Amiga OS memory management

mem.c

@@ -0,0 +1,201 @@
+/*
+ * Copyright (c) 2015 Carsten Larsen
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <stddef.h>
+#include <exec/types.h>
+#include <exec/memory.h>
+#include <clib/exec_protos.h>
+
+#include "ntimed.h"
+#include "mem.h"
+
+struct MemoryBlock
+{
+    struct MemoryBlock *next;
+    size_t size;
+    void *address;
+};
+
+struct MemoryList
+{
+    struct MemoryBlock *first;
+    struct MemoryBlock *last;
+    long size;
+    long count;
+};
+
+struct MemoryList *list = NULL;
+
+void allocerror(char*, size_t);
+void deallocerror(char*, void*);
+
+void* allocmem(size_t size)
+{
+    struct MemoryBlock *newblock;
+    size_t allocsize;
+
+    if (list == NULL) {
+        list = (struct MemoryList*)AllocVec(sizeof(struct MemoryList), MEMF_ANY | MEMF_CLEAR);
+        if (!list) {
+            allocerror("list", sizeof(struct MemoryList));
+            return 0;
+        }
+
+        list->first = NULL;
+        list->last = NULL;
+        list->size = 0;
+        list->count = 0;
+    }
+
+    // Align to bytes of 4
+    allocsize = (size + 3) & ~0x03;
+
+    newblock = (struct MemoryBlock*)AllocVec(sizeof(struct MemoryBlock), MEMF_ANY | MEMF_CLEAR);
+    if (!newblock) {
+        allocerror("block", sizeof(struct MemoryBlock));
+        return 0;
+    }
+
+    newblock->address = (struct MemoryBlock*)AllocVec(allocsize, MEMF_ANY | MEMF_CLEAR);
+    if (!newblock->address) {
+        FreeVec(newblock);
+        allocerror("memory", allocsize);
+        return 0;
+    }
+
+    newblock->size = allocsize;
+    newblock->next = NULL;
+
+    if(list->first == NULL) {
+        list->first = newblock;
+        list->last = newblock;
+    } else {
+        list->last->next = newblock;
+        list->last = newblock;
+    }
+
+    list->size += allocsize;
+    list->count++;
+
+    // DEBUG code
+    // Debug(NULL, "Mememory allocated at address (%x)\n", newblock->address);
+
+    return newblock->address;
+}
+
+void freemem(void* block)
+{
+    struct MemoryBlock *current, *last;
+
+    if (list == NULL || block == NULL) {
+        deallocerror("list", 0);
+        return;
+    }
+
+    if (block == NULL) {
+        deallocerror("memory", 0);
+        return;
+    }
+
+    last = NULL;
+    current = list->first;
+    while (current != NULL && current->address != block) {
+        last = current;
+        current = current->next;
+    }
+
+    if (current == NULL) {
+        deallocerror("address not found", block);
+        return;
+    }
+
+    list->size -= current->size;
+    list->count--;
+
+    if (list->first == current) {
+        list->first = NULL;
+        list->last = NULL;
+    } else if (list->last == current) {
+        last->next = current->next;
+        list->last = last;
+    } else {
+        last->next = current->next;
+    }
+
+    FreeVec(current->address);
+    FreeVec(current);
+
+    // DEBUG code
+    // Debug(NULL, "Mememory deallocated at address (%x)\n", block);
+}
+
+void freeall()
+{
+    struct MemoryBlock *current, *next;
+
+    if (list == NULL) {
+        return;
+    }
+
+    current = list->first;
+    while (current != NULL) {
+        next = current->next;
+        FreeVec(current->address);
+        FreeVec(current);
+        current = next;
+    }
+
+    FreeVec(list);
+    list = NULL;
+}
+
+void allocerror(char *descr, size_t size)
+{
+    Debug(NULL, "Mememory allocation error (%s) with size (%d)\n", descr, size);
+}
+
+void deallocerror(char *descr, void *p)
+{
+    Debug(NULL, "Mememory deallocation error (%s) address (%x)\n", descr, p);
+}
+
+#ifdef __c_plus
+inline void* operator new (size_t size) {
+    return allocmem(size);
+}
+
+inline void* operator new[] (size_t size) {
+    return allocmem(size);
+}
+
+inline void  operator delete (void* ptr) {
+    freemem(ptr);
+}
+
+inline void  operator delete[] (void* ptr) {
+    freemem(ptr);
+}
+#endif