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_Log("PMem", "Physical memory set up (%lli pages of ~%lli MiB used)",
105 giPhysAlloc, (giTotalMemorySize*PAGE_SIZE)/(1024*1024)
109 void MM_DumpStatistics(void)
112 for( i = 1; i < numAddrClasses; i ++ )
114 int first = (i == 1 ? 0 : (1UL << (addrClasses[i-1] - 12)));
115 int last = (1UL << (addrClasses[i] - 12)) - 1;
120 if( last > giPageCount )
123 int total = last - first + 1;
125 for( pg = first; pg < last; pg ++ )
127 if( !MM_GetPhysAddr(&gaPageReferences[pg]) || gaPageReferences[pg] == 0 ) {
131 totalRefs += gaPageReferences[pg];
132 if(gaPageReferences[pg] > 1)
136 int nUsed = (total - nFree);
137 Log_Log("MMPhys", "%ipbit - %i/%i used, %i reused, %i average reference count",
138 addrClasses[i], nUsed, total, nMultiRef,
139 nMultiRef ? (totalRefs-(nUsed - nMultiRef)) / nMultiRef : 0
142 if( last == giPageCount )
145 Log_Log("MMPhys", "%lli/%lli total pages used, 0 - %i possible free range",
146 giPhysAlloc, giTotalMemorySize, giLastPossibleFree);
150 * \fn tPAddr MM_AllocPhys(void)
151 * \brief Allocates a physical page from the general pool
153 tPAddr MM_AllocPhys(void)
160 Mutex_Acquire( &glPhysAlloc );
166 for( i = numAddrClasses; i -- > 1; )
168 first = 1UL << (addrClasses[i-1] - 12);
169 last = (1UL << (addrClasses[i] - 12)) - 1;
170 // Range is above the last free page
171 if( first > giLastPossibleFree )
173 // Last possible free page is in the range
174 if( last > giLastPossibleFree )
175 last = giLastPossibleFree;
178 for( indx = first; indx < last; )
180 if( gaSuperBitmap[indx>>10] == -1 ) {
185 if( gaPageBitmap[indx>>5] == -1 ) {
190 if( gaPageBitmap[indx>>5] & (1 << (indx&31)) ) {
196 if( indx < last ) break;
198 giLastPossibleFree = first; // Well, we couldn't find any in this range
201 if( i <= 1 ) indx = -1;
205 Mutex_Release( &glPhysAlloc );
206 Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p) - %lli/%lli used (indx = %x)",
207 __builtin_return_address(0), giPhysAlloc, giPageCount, indx);
208 Log_Debug("PMem", "giLastPossibleFree = %lli", giLastPossibleFree);
213 if( indx > 0xFFFFF ) {
214 Panic("The fuck? Too many pages! (indx = 0x%x)", indx);
217 if( indx >= giPageCount ) {
218 Mutex_Release( &glPhysAlloc );
219 Log_Error("PMem", "MM_AllocPhys - indx(%i) > giPageCount(%i)", indx, giPageCount);
225 if( MM_GetPhysAddr( &gaPageReferences[indx] ) )
226 gaPageReferences[indx] = 1;
227 gaPageBitmap[ indx>>5 ] |= 1 << (indx&31);
235 if(gaPageBitmap[ indx>>5 ] == -1) {
236 gaSuperBitmap[indx>>10] |= 1 << ((indx>>5)&31);
240 Mutex_Release( &glPhysAlloc );
245 Log_Debug("PMem", "MM_AllocPhys: RETURN %P (%i free)", ret, giPageCount-giPhysAlloc);
246 Proc_PrintBacktrace();
253 * \fn tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
254 * \brief Allocate a range of physical pages
255 * \param Pages Number of pages to allocate
256 * \param MaxBits Maximum number of address bits to use
258 tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
263 ENTER("iPages iMaxBits", Pages, MaxBits);
270 if(MaxBits > PHYS_BITS) MaxBits = PHYS_BITS;
273 Mutex_Acquire( &glPhysAlloc );
275 // Set up search state
276 if( giLastPossibleFree > ((tPAddr)1 << (MaxBits-12)) ) {
277 sidx = (tPAddr)1 << (MaxBits-12);
280 sidx = giLastPossibleFree;
285 // Check if the gap is large enough
292 if( gaPageBitmap[idx] == -1 ) {
298 if( gaPageBitmap[idx] & (1 << sidx) ) {
300 if(sidx < 0) { sidx = 31; idx --; }
308 // Check if it is a free range
309 for( i = 0; i < Pages; i++ )
312 if( gaPageBitmap[idx] & (1 << sidx) )
316 if(sidx < 0) { sidx = 31; idx --; }
324 // Check if an address was found
326 Mutex_Release( &glPhysAlloc );
327 Warning("MM_AllocPhysRange - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
333 for( i = 0; i < Pages; i++ )
335 if( MM_GetPhysAddr( &gaPageReferences[idx*32+sidx] ) )
336 gaPageReferences[idx*32+sidx] = 1;
337 gaPageBitmap[ idx ] |= 1 << sidx;
340 if(sidx == 32) { sidx = 0; idx ++; }
344 ret = (idx << 17) | (sidx << 12);
347 if(gaPageBitmap[ idx ] == -1) gaSuperBitmap[idx/32] |= 1 << (idx%32);
350 Mutex_Release( &glPhysAlloc );
354 Log_Debug("PMem", "MM_AllocPhysRange: RETURN 0x%llx-0x%llx (%i free)",
355 ret, ret + (1<<Pages)-1, giPageCount-giPhysAlloc);
361 * \fn void MM_RefPhys(tPAddr PAddr)
363 void MM_RefPhys(tPAddr PAddr)
368 // We don't care about non-ram pages
369 if(PAddr >= giPageCount) return;
372 Mutex_Acquire( &glPhysAlloc );
374 // Reference the page
375 if( gaPageReferences )
377 if( MM_GetPhysAddr( &gaPageReferences[PAddr] ) == 0 )
380 tVAddr addr = ((tVAddr)&gaPageReferences[PAddr]) & ~0xFFF;
381 // Log_Debug("PMem", "MM_RefPhys: Allocating info for %X", PAddr);
382 Mutex_Release( &glPhysAlloc );
383 if( MM_Allocate( addr ) == 0 ) {
384 Log_KernelPanic("PMem",
385 "MM_RefPhys: Out of physical memory allocating info for %X",
389 Mutex_Acquire( &glPhysAlloc );
391 base = PAddr & ~(1024-1);
392 for( i = 0; i < 1024; i ++ ) {
393 gaPageReferences[base + i] = (gaPageBitmap[(base+i)/32] & (1 << (base+i)%32)) ? 1 : 0;
396 gaPageReferences[ PAddr ] ++;
399 // If not already used
400 if( !(gaPageBitmap[ PAddr / 32 ] & 1 << (PAddr&31)) ) {
403 gaPageBitmap[ PAddr / 32 ] |= 1 << (PAddr&31);
407 if(gaPageBitmap[ PAddr / 32 ] == -1)
408 gaSuperBitmap[PAddr/1024] |= 1 << ((PAddr/32)&31);
411 Mutex_Release( &glPhysAlloc );
415 * \fn void MM_DerefPhys(tPAddr PAddr)
416 * \brief Dereferences a physical page
418 void MM_DerefPhys(tPAddr PAddr)
423 // We don't care about non-ram pages
424 if(PAddr >= giPageCount) return;
426 // Check if it is freed
427 if( !(gaPageBitmap[PAddr / 32] & (1 << PAddr%32)) ) {
428 Log_Warning("MMVirt", "MM_DerefPhys - Non-referenced memory dereferenced");
433 Mutex_Acquire( &glPhysAlloc );
435 if( giLastPossibleFree < PAddr )
436 giLastPossibleFree = PAddr;
439 if( !MM_GetPhysAddr( &gaPageReferences[PAddr] ) || (-- gaPageReferences[PAddr]) == 0 )
442 Log_Debug("PMem", "MM_DerefPhys: Free'd %P (%i free)", PAddr<<12, giPageCount-giPhysAlloc);
443 Proc_PrintBacktrace();
445 //LOG("Freed 0x%x by %p\n", PAddr<<12, __builtin_return_address(0));
447 gaPageBitmap[ PAddr / 32 ] &= ~(1 << (PAddr&31));
448 if(gaPageBitmap[ PAddr / 32 ] == 0)
449 gaSuperBitmap[ PAddr >> 10 ] &= ~(1 << ((PAddr >> 5)&31));
451 if( MM_GetPhysAddr( &gaPageNodes[PAddr] ) )
453 gaPageNodes[PAddr] = NULL;
454 // TODO: Free Node Page when fully unused
459 Mutex_Release( &glPhysAlloc );
463 * \fn int MM_GetRefCount(tPAddr Addr)
465 int MM_GetRefCount(tPAddr PAddr)
470 // We don't care about non-ram pages
471 if(PAddr >= giPageCount) return -1;
473 if( MM_GetPhysAddr( &gaPageReferences[PAddr] ) == 0 )
474 return (gaPageBitmap[PAddr / 32] & (1 << PAddr%32)) ? 1 : 0;
476 // Check if it is freed
477 return gaPageReferences[ PAddr ];
480 int MM_SetPageNode(tPAddr PAddr, void *Node)
484 if( MM_GetRefCount(PAddr) == 0 ) return 1;
488 block_addr = (tVAddr) &gaPageNodes[PAddr];
489 block_addr &= ~(PAGE_SIZE-1);
491 if( !MM_GetPhysAddr( (void*)block_addr ) )
493 if( !MM_Allocate( block_addr ) ) {
494 Log_Warning("PMem", "Unable to allocate Node page");
497 memset( (void*)block_addr, 0, PAGE_SIZE );
500 gaPageNodes[PAddr] = Node;
501 // Log("gaPageNodes[0x%x] = %p", PAddr, Node);
505 int MM_GetPageNode(tPAddr PAddr, void **Node)
507 if( MM_GetRefCount(PAddr) == 0 ) return 1;
510 if( !MM_GetPhysAddr( &gaPageNodes[PAddr] ) ) {
514 *Node = gaPageNodes[PAddr];