/*
- AcessOS Microkernel Version
- mm_phys.c
-*/
-#include <common.h>
+ * Acess2
+ * - Physical memory manager
+ */
+#define DEBUG 0
+#include <acess.h>
#include <mboot.h>
#include <mm_virt.h>
-#define REFERENCE_BASE 0xE0400000
+//#define USE_STACK 1
+#define TRACE_ALLOCS 0 // Print trace messages on AllocPhys/DerefPhys
+
// === IMPORTS ===
extern void gKernelEnd;
// === PROTOTYPES ===
-Uint32 MM_AllocPhys();
-void MM_RefPhys(Uint32 Addr);
-void MM_DerefPhys(Uint32 Addr);
+void MM_Install(tMBoot_Info *MBoot);
+//tPAddr MM_AllocPhys(void);
+//tPAddr MM_AllocPhysRange(int Pages, int MaxBits);
+//void MM_RefPhys(tPAddr PAddr);
+//void MM_DerefPhys(tPAddr PAddr);
+// int MM_GetRefCount(tPAddr PAddr);
// === GLOBALS ===
- int giPhysAlloc = 0;
-Uint giPageCount = 0;
+tMutex glPhysAlloc;
+Uint64 giPhysAlloc = 0; // Number of allocated pages
+Uint64 giPageCount = 0; // Total number of pages
+Uint64 giLastPossibleFree = 0; // Last possible free page (before all pages are used)
+
Uint32 gaSuperBitmap[1024]; // Blocks of 1024 Pages
Uint32 gaPageBitmap[1024*1024/32]; // Individual pages
-Uint32 *gaPageReferences;
+ int *gaPageReferences;
+void **gaPageNodes = (void*)MM_PAGENODE_BASE;
+#define REFENT_PER_PAGE (0x1000/sizeof(gaPageReferences[0]))
// === CODE ===
void MM_Install(tMBoot_Info *MBoot)
{
Uint kernelPages, num;
Uint i;
+ Uint64 maxAddr = 0;
tMBoot_Module *mods;
+ tMBoot_MMapEnt *ent;
+
+ // --- Find largest address
+ MBoot->MMapAddr |= KERNEL_BASE;
+ ent = (void *)( MBoot->MMapAddr );
+ while( (Uint)ent < MBoot->MMapAddr + MBoot->MMapLength )
+ {
+ // Adjust for size
+ ent->Size += 4;
+
+ // If entry is RAM and is above `maxAddr`, change `maxAddr`
+ if(ent->Type == 1 && ent->Base + ent->Length > maxAddr)
+ maxAddr = ent->Base + ent->Length;
+ // Go to next entry
+ ent = (tMBoot_MMapEnt *)( (Uint)ent + ent->Size );
+ }
- // Initialise globals
- giPageCount = (MBoot->HighMem >> 2) + 256; // HighMem is a kByte value
- Log("giPageCount = %i", giPageCount);
+ if(maxAddr == 0) {
+ giPageCount = (MBoot->HighMem >> 2) + 256; // HighMem is a kByte value
+ }
+ else {
+ giPageCount = maxAddr >> 12;
+ }
+ giLastPossibleFree = giPageCount - 1;
+
+ memsetd(gaPageBitmap, 0xFFFFFFFF, giPageCount/32);
- // Get used page count
- kernelPages = (Uint)&gKernelEnd - KERNEL_BASE;
+ // Set up allocateable space
+ ent = (void *)( MBoot->MMapAddr );
+ while( (Uint)ent < MBoot->MMapAddr + MBoot->MMapLength )
+ {
+ memsetd( &gaPageBitmap[ent->Base/(4096*32)], 0, ent->Length/(4096*32) );
+ ent = (tMBoot_MMapEnt *)( (Uint)ent + ent->Size );
+ }
+
+ // Get used page count (Kernel)
+ kernelPages = (Uint)&gKernelEnd - KERNEL_BASE - 0x100000;
kernelPages += 0xFFF; // Page Align
kernelPages >>= 12;
// Fill page bitmap
num = kernelPages/32;
- memsetd(gaPageBitmap, -1, num);
- gaPageBitmap[ num ] = (1 << (kernelPages & 31)) - 1;
+ memsetd( &gaPageBitmap[0x100000/(4096*32)], -1, num );
+ gaPageBitmap[ 0x100000/(4096*32) + num ] = (1 << (kernelPages & 31)) - 1;
// Fill Superpage bitmap
num = kernelPages/(32*32);
- memsetd(gaSuperBitmap, -1, num);
- gaSuperBitmap[ num ] = (1 << ((kernelPages / 32) & 31)) - 1;
+ memsetd( &gaSuperBitmap[0x100000/(4096*32*32)], -1, num );
+ gaSuperBitmap[ 0x100000/(4096*32*32) + num ] = (1 << ((kernelPages / 32) & 31)) - 1;
// Mark Multiboot's pages as taken
// - Structure
while(num--)
MM_RefPhys( (mods[i].Start & ~0xFFF) + (num<<12) );
}
+
+ gaPageReferences = (void*)MM_REFCOUNT_BASE;
+
+ Log_Log("PMem", "Physical memory set up");
+}
+
+/**
+ * \fn tPAddr MM_AllocPhys(void)
+ * \brief Allocates a physical page from the general pool
+ */
+tPAddr MM_AllocPhys(void)
+{
+ // int a, b, c;
+ int indx = -1;
+ tPAddr ret;
- // Allocate References
- Log("Reference Pages %i", (giPageCount*4+0xFFF)>>12);
- for(num = 0; num < (giPageCount*4+0xFFF)>>12; num++)
+ ENTER("");
+
+ Mutex_Acquire( &glPhysAlloc );
+
+ // Classful scan
+ #if 1
+ {
+ const int addrClasses[] = {0,16,20,24,32,64};
+ const int numAddrClasses = sizeof(addrClasses)/sizeof(addrClasses[0]);
+ int i;
+ int first, last;
+ for( i = numAddrClasses; i -- > 1; )
{
- MM_Allocate( REFERENCE_BASE + (num<<12) );
+ first = 1 << (addrClasses[i-1] - 12);
+ last = (1 << (addrClasses[i] - 12)) - 1;
+ // Range is above the last free page
+ if( first > giLastPossibleFree )
+ continue;
+ // Last possible free page is in the range
+ if( last > giLastPossibleFree )
+ last = giLastPossibleFree;
+
+ // Scan the range
+ for( indx = first; indx < last; )
+ {
+ if( gaSuperBitmap[indx>>10] == -1 ) {
+ indx += 1024;
+ continue;
+ }
+
+ if( gaPageBitmap[indx>>5] == -1 ) {
+ indx += 32;
+ continue;
+ }
+
+ if( gaPageBitmap[indx>>5] & (1 << (indx&31)) ) {
+ indx ++;
+ continue;
+ }
+ break;
+ }
+ if( indx < last ) break;
+
+ giLastPossibleFree = first; // Well, we couldn't find any in this range
}
-
- // Fill references
- gaPageReferences = (void*)REFERENCE_BASE;
- memsetd(gaPageReferences, 1, kernelPages);
- for( num = kernelPages; num < giPageCount; num++ )
+ // Out of memory?
+ if( i <= 1 ) indx = -1;
+ }
+ #elif 0
+ // Find free page
+ // Scan downwards
+ LOG("giLastPossibleFree = %i", giLastPossibleFree);
+ for( indx = giLastPossibleFree; indx >= 0; )
{
- gaPageReferences[num] = (gaPageBitmap[ num / 32 ] >> (num&31)) & 1;
+ if( gaSuperBitmap[indx>>10] == -1 ) {
+ indx -= 1024;
+ continue;
+ }
+
+ if( gaPageBitmap[indx>>5] == -1 ) {
+ indx -= 32;
+ continue;
+ }
+
+ if( gaPageBitmap[indx>>5] & (1 << (indx&31)) ) {
+ indx --;
+ continue;
+ }
+ break;
}
+ if( indx >= 0 )
+ giLastPossibleFree = indx;
+ LOG("indx = %i", indx);
+ #else
+ c = giLastPossibleFree % 32;
+ b = (giLastPossibleFree / 32) % 32;
+ a = giLastPossibleFree / 1024;
+
+ LOG("a=%i,b=%i,c=%i", a, b, c);
+ for( ; gaSuperBitmap[a] == -1 && a >= 0; a-- );
+ if(a < 0) {
+ Mutex_Release( &glPhysAlloc );
+ Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p) - %lli/%lli used",
+ __builtin_return_address(0), giPhysAlloc, giPageCount);
+ LEAVE('i', 0);
+ return 0;
+ }
+ for( ; gaSuperBitmap[a] & (1<<b); b-- );
+ for( ; gaPageBitmap[a*32+b] & (1<<c); c-- );
+ LOG("a=%i,b=%i,c=%i", a, b, c);
+ indx = (a << 10) | (b << 5) | c;
+ if( indx >= 0 )
+ giLastPossibleFree = indx;
+ #endif
+
+ if( indx < 0 ) {
+ Mutex_Release( &glPhysAlloc );
+ Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p) - %lli/%lli used (indx = %x)",
+ __builtin_return_address(0), giPhysAlloc, giPageCount, indx);
+ Log_Debug("PMem", "giLastPossibleFree = %lli", giLastPossibleFree);
+ LEAVE('i', 0);
+ return 0;
+ }
+
+ if( indx > 0xFFFFF ) {
+ Panic("The fuck? Too many pages! (indx = 0x%x)", indx);
+ }
+
+ if( indx >= giPageCount ) {
+ Mutex_Release( &glPhysAlloc );
+ Log_Error("PMem", "MM_AllocPhys - indx(%i) > giPageCount(%i)", indx, giPageCount);
+ LEAVE('i', 0);
+ return 0;
+ }
+
+ // Mark page used
+ if( MM_GetPhysAddr( (tVAddr)&gaPageReferences[indx] ) )
+ gaPageReferences[indx] = 1;
+ gaPageBitmap[ indx>>5 ] |= 1 << (indx&31);
+
+ giPhysAlloc ++;
+
+ // Get address
+ ret = indx << 12;
+
+ // Mark used block
+ if(gaPageBitmap[ indx>>5 ] == -1) {
+ gaSuperBitmap[indx>>10] |= 1 << ((indx>>5)&31);
+ }
+
+ // Release Spinlock
+ Mutex_Release( &glPhysAlloc );
+
+ LEAVE('X', ret);
+ #if TRACE_ALLOCS
+ Log_Debug("PMem", "MM_AllocPhys: RETURN 0x%llx (%i free)", ret, giPageCount-giPhysAlloc);
+ #endif
+ return ret;
}
/**
- * \fn tPAddr MM_AllocPhys()
- * \brief Allocates a physical page
+ * \fn tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
+ * \brief Allocate a range of physical pages
+ * \param Pages Number of pages to allocate
+ * \param MaxBits Maximum number of address bits to use
*/
-tPAddr MM_AllocPhys()
+tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
{
- int num = giPageCount / 32 / 32;
- int a, b, c;
- Uint32 ret;
+ int a, b;
+ int i, idx, sidx;
+ tPAddr ret;
- LOCK( &giPhysAlloc );
+ ENTER("iPages iMaxBits", Pages, MaxBits);
+
+ // Sanity Checks
+ if(MaxBits < 0) {
+ LEAVE('i', 0);
+ return 0;
+ }
+ if(MaxBits > PHYS_BITS) MaxBits = PHYS_BITS;
+
+ // Lock
+ Mutex_Acquire( &glPhysAlloc );
+
+ // Set up search state
+ if( giLastPossibleFree > ((tPAddr)1 << (MaxBits-12)) ) {
+ sidx = (tPAddr)1 << (MaxBits-12);
+ }
+ else {
+ sidx = giLastPossibleFree;
+ }
+ idx = sidx / 32;
+ sidx %= 32;
+ b = idx % 32;
+ a = idx / 32;
+
+ #if 0
+ LOG("a=%i, b=%i, idx=%i, sidx=%i", a, b, idx, sidx);
// Find free page
- for(a=0;gaSuperBitmap[a]==-1&&a<num;a++);
- if(a == num) {
- RELEASE( &giPhysAlloc );
- Warning("MM_AllocPhys - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
+ for( ; gaSuperBitmap[a] == -1 && a --; ) b = 31;
+ if(a < 0) {
+ Mutex_Release( &glPhysAlloc );
+ Warning("MM_AllocPhysRange - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
+ LEAVE('i', 0);
return 0;
}
- for(b=0;gaSuperBitmap[a]&(1<<b);b++);
- for(c=0;gaPageBitmap[a*32+b]&(1<<c);c++);
- //for(c=0;gaPageReferences[a*32*32+b*32+c]>0;c++);
+ LOG("a = %i", a);
+ for( ; gaSuperBitmap[a] & (1 << b); b-- ) sidx = 31;
+ LOG("b = %i", b);
+ idx = a * 32 + b;
+ for( ; gaPageBitmap[idx] & (1 << sidx); sidx-- )
+ LOG("gaPageBitmap[%i] = 0x%08x", idx, gaPageBitmap[idx]);
- // Mark page used
- if(gaPageReferences)
- gaPageReferences[a*32*32+b*32+c] = 1;
- gaPageBitmap[ a*32+b ] |= 1 << c;
+ LOG("idx = %i, sidx = %i", idx, sidx);
+ #else
+
+ #endif
+
+ // Check if the gap is large enough
+ while( idx >= 0 )
+ {
+ // Find a free page
+ for( ; ; )
+ {
+ // Bulk Skip
+ if( gaPageBitmap[idx] == -1 ) {
+ idx --;
+ sidx = 31;
+ continue;
+ }
+
+ if( gaPageBitmap[idx] & (1 << sidx) ) {
+ sidx --;
+ if(sidx < 0) { sidx = 31; idx --; }
+ if(idx < 0) break;
+ continue;
+ }
+ break;
+ }
+ if( idx < 0 ) break;
+
+ // Check if it is a free range
+ for( i = 0; i < Pages; i++ )
+ {
+ // Used page? break
+ if( gaPageBitmap[idx] & (1 << sidx) )
+ break;
+
+ sidx --;
+ if(sidx < 0) { sidx = 31; idx --; }
+ if(idx < 0) break;
+ }
+
+ if( i == Pages )
+ break;
+ }
+
+ // Check if an address was found
+ if( idx < 0 ) {
+ Mutex_Release( &glPhysAlloc );
+ Warning("MM_AllocPhysRange - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
+ LEAVE('i', 0);
+ return 0;
+ }
+
+ // Mark pages used
+ for( i = 0; i < Pages; i++ )
+ {
+ if( MM_GetPhysAddr( (tVAddr)&gaPageReferences[idx*32+sidx] ) )
+ gaPageReferences[idx*32+sidx] = 1;
+ gaPageBitmap[ idx ] |= 1 << sidx;
+ sidx ++;
+ giPhysAlloc ++;
+ if(sidx == 32) { sidx = 0; idx ++; }
+ }
// Get address
- ret = (a << 22) + (b << 17) + (c << 12);
+ ret = (idx << 17) | (sidx << 12);
// Mark used block
- if(gaPageBitmap[ a*32+b ] == -1) gaSuperBitmap[a] |= 1 << b;
+ if(gaPageBitmap[ idx ] == -1) gaSuperBitmap[idx/32] |= 1 << (idx%32);
// Release Spinlock
- RELEASE( &giPhysAlloc );
- //LOG("ret = %x", ret);
+ Mutex_Release( &glPhysAlloc );
+
+ LEAVE('X', ret);
+ #if TRACE_ALLOCS
+ Log_Debug("PMem", "MM_AllocPhysRange: RETURN 0x%llx-0x%llx (%i free)",
+ ret, ret + (1<<Pages)-1, giPageCount-giPhysAlloc);
+ #endif
return ret;
}
/**
- * \fn void MM_RefPhys(tPAddr Addr)
+ * \fn void MM_RefPhys(tPAddr PAddr)
*/
-void MM_RefPhys(tPAddr Addr)
+void MM_RefPhys(tPAddr PAddr)
{
// Get page number
- Addr >>= 12;
-
+ PAddr >>= 12;
+
// We don't care about non-ram pages
- if(Addr >= giPageCount) return;
+ if(PAddr >= giPageCount) return;
// Lock Structures
- LOCK( &giPhysAlloc );
+ Mutex_Acquire( &glPhysAlloc );
// Reference the page
- if(gaPageReferences)
- gaPageReferences[ Addr ] ++;
+ if( gaPageReferences )
+ {
+ if( MM_GetPhysAddr( (tVAddr)&gaPageReferences[PAddr] ) == 0 ) {
+ tVAddr addr = ((tVAddr)&gaPageReferences[PAddr]) & ~0xFFF;
+ Log_Debug("PMem", "MM_RefPhys: Allocating info for %X", PAddr);
+ Mutex_Release( &glPhysAlloc );
+ if( MM_Allocate( addr ) == 0 ) {
+ Log_KernelPanic("PMem", "MM_RefPhys: Out of physical memory");
+ }
+ Mutex_Acquire( &glPhysAlloc );
+ memset( (void*)addr, 0, 0x1000 );
+ }
+ gaPageReferences[ PAddr ] ++;
+ }
// Mark as used
- gaPageBitmap[ Addr / 32 ] |= 1 << (Addr&31);
+ gaPageBitmap[ PAddr / 32 ] |= 1 << (PAddr&31);
// Mark used block
- if(gaPageBitmap[ Addr / 32 ] == -1) gaSuperBitmap[Addr/1024] |= 1 << ((Addr/32)&31);
+ if(gaPageBitmap[ PAddr / 32 ] == -1)
+ gaSuperBitmap[PAddr/1024] |= 1 << ((PAddr/32)&31);
// Release Spinlock
- RELEASE( &giPhysAlloc );
+ Mutex_Release( &glPhysAlloc );
}
/**
- * \fn void MM_DerefPhys(Uint32 Addr)
+ * \fn void MM_DerefPhys(tPAddr PAddr)
+ * \brief Dereferences a physical page
*/
-void MM_DerefPhys(tPAddr Addr)
+void MM_DerefPhys(tPAddr PAddr)
{
// Get page number
- Addr >>= 12;
-
+ PAddr >>= 12;
+
// We don't care about non-ram pages
- if(Addr >= giPageCount) return;
+ if(PAddr >= giPageCount) return;
// Check if it is freed
- if(gaPageReferences[ Addr ] == 0) {
- Warning("MM_DerefPhys - Non-referenced memory dereferenced");
+ if( !(gaPageBitmap[PAddr / 32] & (1 << PAddr%32)) ) {
+ Log_Warning("MMVirt", "MM_DerefPhys - Non-referenced memory dereferenced");
return;
}
// Lock Structures
- LOCK( &giPhysAlloc );
+ Mutex_Acquire( &glPhysAlloc );
+ if( giLastPossibleFree < PAddr )
+ giLastPossibleFree = PAddr;
+
// Dereference
- gaPageReferences[ Addr ] --;
-
- // Mark as free in bitmaps
- if( gaPageReferences[ Addr ] == 0 )
+ if( !MM_GetPhysAddr( (tVAddr)&gaPageReferences[PAddr] ) || (-- gaPageReferences[PAddr]) == 0 )
+ {
+ #if TRACE_ALLOCS
+ Log_Debug("PMem", "MM_DerefPhys: Free'd 0x%x (%i free)", PAddr, giPageCount-giPhysAlloc);
+ #endif
+ //LOG("Freed 0x%x by %p\n", PAddr<<12, __builtin_return_address(0));
+ giPhysAlloc --;
+ gaPageBitmap[ PAddr / 32 ] &= ~(1 << (PAddr&31));
+ if(gaPageBitmap[ PAddr / 32 ] == 0)
+ gaSuperBitmap[ PAddr >> 10 ] &= ~(1 << ((PAddr >> 5)&31));
+ }
+
+ if( MM_GetPhysAddr( (tVAddr) &gaPageNodes[PAddr] ) )
{
- gaPageBitmap[ Addr / 32 ] &= ~(1 << (Addr&31));
- if(gaPageReferences[ Addr ] == 0)
- gaSuperBitmap[ Addr >> 10 ] &= ~(1 << ((Addr >> 5)&31));
+ gaPageNodes[PAddr] = NULL;
+ // TODO: Free Node Page when fully unused
}
// Release spinlock
- RELEASE( &giPhysAlloc );
+ Mutex_Release( &glPhysAlloc );
}
/**
* \fn int MM_GetRefCount(tPAddr Addr)
*/
-int MM_GetRefCount(tPAddr Addr)
+int MM_GetRefCount(tPAddr PAddr)
{
// Get page number
- Addr >>= 12;
+ PAddr >>= 12;
// We don't care about non-ram pages
- if(Addr >= giPageCount) return -1;
+ if(PAddr >= giPageCount) return -1;
+
+ if( MM_GetPhysAddr( (tVAddr)&gaPageReferences[PAddr] ) == 0 )
+ return (gaPageBitmap[PAddr / 32] & (1 << PAddr%32)) ? 1 : 0;
// Check if it is freed
- return gaPageReferences[ Addr ];
+ return gaPageReferences[ PAddr ];
}
+
+int MM_SetPageNode(tPAddr PAddr, void *Node)
+{
+ tVAddr block_addr;
+
+ if( MM_GetRefCount(PAddr) == 0 ) return 1;
+
+ PAddr /= PAGE_SIZE;
+
+ block_addr = (tVAddr) &gaPageNodes[PAddr];
+ block_addr &= ~(PAGE_SIZE-1);
+
+ if( !MM_GetPhysAddr( block_addr ) )
+ {
+ if( !MM_Allocate( block_addr ) ) {
+ Log_Warning("PMem", "Unable to allocate Node page");
+ return -1;
+ }
+ memset( (void*)block_addr, 0, PAGE_SIZE );
+ }
+
+ gaPageNodes[PAddr] = Node;
+ return 0;
+}
+
+int MM_GetPageNode(tPAddr PAddr, void **Node)
+{
+ if( MM_GetRefCount(PAddr) == 0 ) {
+ return 1;
+ }
+ if( !MM_GetPhysAddr( (tVAddr) &gaPageNodes[PAddr] ) ) {
+ *Node = NULL;
+ return 0;
+ }
+ *Node = gaPageNodes[PAddr];
+ return 0;
+}
+
git.ucc.asn.au / tpg / acess2.git / blobdiff
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