1 #include <exec/types.h>
2 #include <exec/execbase.h>
3 #include <exec/memory.h>
4 #include <proto/exec.h>
5 #include <proto/graphics.h>
8 #include "fix_mem_region.h"
13 struct MemChunk *first;
14 struct MemChunk *last;
18 void add_chunk(struct MemChunkList *l, struct MemChunk *mc)
23 l->last->mc_Next = mc;
25 l->free += mc->mc_Bytes;
28 struct MemHeader *split_region(struct MemHeader *lower, ULONG split_at)
30 struct MemHeader *upper = (struct MemHeader *)AllocMem(sizeof(struct MemHeader), MEMF_PUBLIC | MEMF_CLEAR);
32 struct MemChunkList ll = {NULL, NULL, 0};
33 struct MemChunkList ul = {NULL, NULL, 0};
35 struct MemChunk *mc = lower->mh_First;
39 struct MemChunk *next_chunk = mc->mc_Next;
42 ULONG start = (ULONG)mc;
43 ULONG end = start + mc->mc_Bytes;
47 else if (split_at <= start)
51 mc->mc_Bytes = split_at - start;
54 struct MemChunk *new_chunk = (struct MemChunk *)split_at;
55 new_chunk->mc_Next = NULL;
56 new_chunk->mc_Bytes = end - split_at;
57 add_chunk(&ul, new_chunk);
62 upper->mh_Node.ln_Type = NT_MEMORY;
63 upper->mh_Node.ln_Pri = lower->mh_Node.ln_Pri;
64 upper->mh_Node.ln_Name = lower->mh_Node.ln_Name; // Use a custom name?
65 upper->mh_Attributes = lower->mh_Attributes;
67 lower->mh_First = ll.first;
68 upper->mh_First = ul.first;
70 upper->mh_Lower = (APTR)split_at;
71 upper->mh_Upper = lower->mh_Upper;
72 lower->mh_Upper = (APTR)split_at;
74 lower->mh_Free = ll.free;
75 upper->mh_Free = ul.free;
80 BOOL overlap(struct MemHeader *mh, ULONG lower, ULONG upper)
82 return lower < (ULONG)(mh->mh_Upper) && (ULONG)(mh->mh_Lower) < upper;
85 void mark_region_a314(ULONG address, ULONG size)
87 struct List *memlist = &(SysBase->MemList);
89 for (struct Node *node = memlist->lh_Head; node->ln_Succ != NULL; node = node->ln_Succ)
91 struct MemHeader *mh = (struct MemHeader *)node;
92 if (overlap(mh, address, address + size))
94 if ((ULONG)mh->mh_Lower < address)
96 mh->mh_Attributes &= ~MEMF_A314;
97 mh = split_region(mh, address);
100 Remove((struct Node *)mh);
102 if (address + size < (ULONG)mh->mh_Upper)
104 struct MemHeader *new_mh = split_region(mh, address + size);
105 new_mh->mh_Attributes &= ~MEMF_A314;
106 Enqueue(memlist, (struct Node *)new_mh);
109 mh->mh_Attributes |= MEMF_A314;
110 Enqueue(memlist, (struct Node *)mh);
119 mark_region_a314(ca->mem_base, ca->mem_size);
124 ULONG translate_address_a314(__reg("a0") void *address)
126 ULONG offset = (ULONG)address - ca->mem_base;
127 if (offset < ca->mem_size)