3 * - Physical memory manager
12 #define TRACE_ALLOCS 0 // Print trace messages on AllocPhys/DerefPhys
14 static const int addrClasses[] = {0,16,20,24,32,64};
15 static const int numAddrClasses = sizeof(addrClasses)/sizeof(addrClasses[0]);
18 extern void Proc_PrintBacktrace(void);
21 void MM_Install(int NPMemRanges, tPMemMapEnt *PMemRanges);
22 //tPAddr MM_AllocPhys(void);
23 //tPAddr MM_AllocPhysRange(int Pages, int MaxBits);
24 //void MM_RefPhys(tPAddr PAddr);
25 //void MM_DerefPhys(tPAddr PAddr);
26 // int MM_GetRefCount(tPAddr PAddr);
30 Uint64 giPhysAlloc = 0; // Number of allocated pages
31 Uint64 giPageCount = 0; // Total number of pages
32 Uint64 giLastPossibleFree = 0; // Last possible free page (before all pages are used)
33 Uint64 giTotalMemorySize = 0; // Total number of allocatable pages
35 Uint32 gaSuperBitmap[1024]; // Blocks of 1024 Pages
36 Uint32 gaPageBitmap[1024*1024/32]; // Individual pages
37 int *gaPageReferences;
38 void **gaPageNodes = (void*)MM_PAGENODE_BASE;
39 #define REFENT_PER_PAGE (0x1000/sizeof(gaPageReferences[0]))
42 void MM_Install(int NPMemRanges, tPMemMapEnt *PMemRanges)
47 // --- Find largest address
48 for( i = 0; i < NPMemRanges; i ++ )
50 tPMemMapEnt *ent = &PMemRanges[i];
51 // If entry is RAM and is above `maxAddr`, change `maxAddr`
52 if(ent->Type == PMEMTYPE_FREE || ent->Type == PMEMTYPE_USED)
54 if(ent->Start + ent->Length > maxAddr)
55 maxAddr = ent->Start + ent->Length;
56 giTotalMemorySize += ent->Length >> 12;
60 giPageCount = maxAddr >> 12;
61 giLastPossibleFree = giPageCount - 1;
63 memsetd(gaPageBitmap, 0xFFFFFFFF, giPageCount/32);
65 // Set up allocateable space
66 for( i = 0; i < NPMemRanges; i ++ )
68 tPMemMapEnt *ent = &PMemRanges[i];
69 if( ent->Type == PMEMTYPE_FREE )
71 Uint64 startpg = ent->Start / PAGE_SIZE;
72 Uint64 pgcount = ent->Length / PAGE_SIZE;
73 while( startpg % 32 && pgcount ) {
74 gaPageBitmap[startpg/32] &= ~(1U << (startpg%32));
78 memsetd( &gaPageBitmap[startpg/32], 0, pgcount/32 );
79 startpg += pgcount - pgcount%32;
80 pgcount -= pgcount - pgcount%32;
82 gaPageBitmap[startpg/32] &= ~(1U << (startpg%32));
87 else if( ent->Type == PMEMTYPE_USED )
89 giPhysAlloc += ent->Length / PAGE_SIZE;
93 // Fill Superpage bitmap
94 // - A set bit means that there are no free pages in this block of 32
95 for( i = 0; i < (giPageCount+31)/32; i ++ )
97 if( gaPageBitmap[i] + 1 == 0 ) {
98 gaSuperBitmap[i/32] |= (1 << i%32);
102 gaPageReferences = (void*)MM_REFCOUNT_BASE;
104 Log_Debug("PMem", "maxAddr = %P", maxAddr);
105 Log_Log("PMem", "Physical memory set up (%lli pages of ~%lli MiB used)",
106 giPhysAlloc, (giTotalMemorySize*PAGE_SIZE)/(1024*1024)
110 void MM_DumpStatistics(void)
113 for( i = 1; i < numAddrClasses; i ++ )
115 int first = (i == 1 ? 0 : (1UL << (addrClasses[i-1] - 12)));
116 int last = (1UL << (addrClasses[i] - 12)) - 1;
121 if( last > giPageCount )
124 int total = last - first + 1;
126 for( pg = first; pg < last; pg ++ )
128 if( !MM_GetPhysAddr(&gaPageReferences[pg]) || gaPageReferences[pg] == 0 ) {
132 totalRefs += gaPageReferences[pg];
133 if(gaPageReferences[pg] > 1)
137 int nUsed = (total - nFree);
138 Log_Log("MMPhys", "%ipbit - %i/%i used, %i reused, %i average reference count",
139 addrClasses[i], nUsed, total, nMultiRef,
140 nMultiRef ? (totalRefs-(nUsed - nMultiRef)) / nMultiRef : 0
143 if( last == giPageCount )
146 Log_Log("MMPhys", "%lli/%lli total pages used, 0 - %i possible free range",
147 giPhysAlloc, giTotalMemorySize, giLastPossibleFree);
151 * \fn tPAddr MM_AllocPhys(void)
152 * \brief Allocates a physical page from the general pool
154 tPAddr MM_AllocPhys(void)
161 Mutex_Acquire( &glPhysAlloc );
167 for( i = numAddrClasses; i -- > 1; )
169 first = 1UL << (addrClasses[i-1] - 12);
170 last = (1UL << (addrClasses[i] - 12)) - 1;
171 // Range is above the last free page
172 if( first > giLastPossibleFree )
174 // Last possible free page is in the range
175 if( last > giLastPossibleFree )
176 last = giLastPossibleFree;
179 for( indx = first; indx < last; )
181 if( gaSuperBitmap[indx>>10] == -1 ) {
186 if( gaPageBitmap[indx>>5] == -1 ) {
191 if( gaPageBitmap[indx>>5] & (1 << (indx&31)) ) {
197 if( indx < last ) break;
199 giLastPossibleFree = first; // Well, we couldn't find any in this range
202 if( i <= 1 ) indx = -1;
206 Mutex_Release( &glPhysAlloc );
207 Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p) - %lli/%lli used (indx = %x)",
208 __builtin_return_address(0), giPhysAlloc, giPageCount, indx);
209 Log_Debug("PMem", "giLastPossibleFree = %lli", giLastPossibleFree);
214 if( indx > 0xFFFFF ) {
215 Panic("The fuck? Too many pages! (indx = 0x%x)", indx);
218 if( indx >= giPageCount ) {
219 Mutex_Release( &glPhysAlloc );
220 Log_Error("PMem", "MM_AllocPhys - indx(%i) > giPageCount(%i)", indx, giPageCount);
226 if( MM_GetPhysAddr( &gaPageReferences[indx] ) )
227 gaPageReferences[indx] = 1;
228 gaPageBitmap[ indx>>5 ] |= 1 << (indx&31);
236 if(gaPageBitmap[ indx>>5 ] == -1) {
237 gaSuperBitmap[indx>>10] |= 1 << ((indx>>5)&31);
241 Mutex_Release( &glPhysAlloc );
246 Log_Debug("PMem", "MM_AllocPhys: RETURN %P (%i free)", ret, giPageCount-giPhysAlloc);
247 Proc_PrintBacktrace();
254 * \fn tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
255 * \brief Allocate a range of physical pages
256 * \param Pages Number of pages to allocate
257 * \param MaxBits Maximum number of address bits to use
259 tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
264 ENTER("iPages iMaxBits", Pages, MaxBits);
271 if(MaxBits > PHYS_BITS) MaxBits = PHYS_BITS;
274 Mutex_Acquire( &glPhysAlloc );
276 // Set up search state
277 if( giLastPossibleFree > ((tPAddr)1 << (MaxBits-12)) ) {
278 sidx = (tPAddr)1 << (MaxBits-12);
281 sidx = giLastPossibleFree;
286 // Check if the gap is large enough
293 if( gaPageBitmap[idx] == -1 ) {
299 if( gaPageBitmap[idx] & (1 << sidx) ) {
301 if(sidx < 0) { sidx = 31; idx --; }
309 // Check if it is a free range
310 for( i = 0; i < Pages; i++ )
313 if( gaPageBitmap[idx] & (1 << sidx) )
317 if(sidx < 0) { sidx = 31; idx --; }
325 // Check if an address was found
327 Mutex_Release( &glPhysAlloc );
328 Warning("MM_AllocPhysRange - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
334 for( i = 0; i < Pages; i++ )
336 if( MM_GetPhysAddr( &gaPageReferences[idx*32+sidx] ) )
337 gaPageReferences[idx*32+sidx] = 1;
338 gaPageBitmap[ idx ] |= 1 << sidx;
341 if(sidx == 32) { sidx = 0; idx ++; }
345 ret = (idx << 17) | (sidx << 12);
348 if(gaPageBitmap[ idx ] == -1) gaSuperBitmap[idx/32] |= 1 << (idx%32);
351 Mutex_Release( &glPhysAlloc );
355 Log_Debug("PMem", "MM_AllocPhysRange: RETURN 0x%llx-0x%llx (%i free)",
356 ret, ret + (1<<Pages)-1, giPageCount-giPhysAlloc);
362 * \fn void MM_RefPhys(tPAddr PAddr)
364 void MM_RefPhys(tPAddr PAddr)
369 // We don't care about non-ram pages
370 if(PAddr >= giPageCount) return;
373 Mutex_Acquire( &glPhysAlloc );
375 // Reference the page
376 if( gaPageReferences )
378 if( MM_GetPhysAddr( &gaPageReferences[PAddr] ) == 0 )
381 tVAddr addr = ((tVAddr)&gaPageReferences[PAddr]) & ~0xFFF;
382 // Log_Debug("PMem", "MM_RefPhys: Allocating info for %X", PAddr);
383 Mutex_Release( &glPhysAlloc );
384 if( MM_Allocate( addr ) == 0 ) {
385 Log_KernelPanic("PMem",
386 "MM_RefPhys: Out of physical memory allocating info for %X",
390 Mutex_Acquire( &glPhysAlloc );
392 base = PAddr & ~(1024-1);
393 for( i = 0; i < 1024; i ++ ) {
394 gaPageReferences[base + i] = (gaPageBitmap[(base+i)/32] & (1 << (base+i)%32)) ? 1 : 0;
397 gaPageReferences[ PAddr ] ++;
400 // If not already used
401 if( !(gaPageBitmap[ PAddr / 32 ] & 1 << (PAddr&31)) ) {
404 gaPageBitmap[ PAddr / 32 ] |= 1 << (PAddr&31);
408 if(gaPageBitmap[ PAddr / 32 ] == -1)
409 gaSuperBitmap[PAddr/1024] |= 1 << ((PAddr/32)&31);
412 Mutex_Release( &glPhysAlloc );
416 * \fn void MM_DerefPhys(tPAddr PAddr)
417 * \brief Dereferences a physical page
419 void MM_DerefPhys(tPAddr PAddr)
424 // We don't care about non-ram pages
425 if(PAddr >= giPageCount) return;
427 // Check if it is freed
428 if( !(gaPageBitmap[PAddr / 32] & (1 << PAddr%32)) ) {
429 Log_Warning("MMVirt", "MM_DerefPhys - Non-referenced memory dereferenced");
434 Mutex_Acquire( &glPhysAlloc );
436 if( giLastPossibleFree < PAddr )
437 giLastPossibleFree = PAddr;
440 if( !MM_GetPhysAddr( &gaPageReferences[PAddr] ) || (-- gaPageReferences[PAddr]) == 0 )
443 Log_Debug("PMem", "MM_DerefPhys: Free'd %P (%i free)", PAddr<<12, giPageCount-giPhysAlloc);
444 Proc_PrintBacktrace();
446 //LOG("Freed 0x%x by %p\n", PAddr<<12, __builtin_return_address(0));
448 gaPageBitmap[ PAddr / 32 ] &= ~(1 << (PAddr&31));
449 if(gaPageBitmap[ PAddr / 32 ] == 0)
450 gaSuperBitmap[ PAddr >> 10 ] &= ~(1 << ((PAddr >> 5)&31));
452 if( MM_GetPhysAddr( &gaPageNodes[PAddr] ) )
454 gaPageNodes[PAddr] = NULL;
455 // TODO: Free Node Page when fully unused
460 Mutex_Release( &glPhysAlloc );
464 * \fn int MM_GetRefCount(tPAddr Addr)
466 int MM_GetRefCount(tPAddr PAddr)
471 // We don't care about non-ram pages
472 if(PAddr >= giPageCount) return -1;
474 if( MM_GetPhysAddr( &gaPageReferences[PAddr] ) == 0 )
475 return (gaPageBitmap[PAddr / 32] & (1 << PAddr%32)) ? 1 : 0;
477 // Check if it is freed
478 return gaPageReferences[ PAddr ];
481 int MM_SetPageNode(tPAddr PAddr, void *Node)
485 if( MM_GetRefCount(PAddr) == 0 ) return 1;
489 block_addr = (tVAddr) &gaPageNodes[PAddr];
490 block_addr &= ~(PAGE_SIZE-1);
492 if( !MM_GetPhysAddr( (void*)block_addr ) )
494 if( !MM_Allocate( block_addr ) ) {
495 Log_Warning("PMem", "Unable to allocate Node page");
498 memset( (void*)block_addr, 0, PAGE_SIZE );
501 gaPageNodes[PAddr] = Node;
502 // Log("gaPageNodes[0x%x] = %p", PAddr, Node);
506 int MM_GetPageNode(tPAddr PAddr, void **Node)
508 if( MM_GetRefCount(PAddr) == 0 ) return 1;
511 if( !MM_GetPhysAddr( &gaPageNodes[PAddr] ) ) {
515 *Node = gaPageNodes[PAddr];