X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Farch%2Fx86%2Fmm_phys.c;h=3c7dcddc4f2bea4907c9dc3e98e8c624acb6a710;hb=3998cfbbadb005bf3ad52ea2538dc21f82864ddc;hp=bd8d60e49388236ebca7473cd9bbab5b80eac5cb;hpb=d52a53f035af92941c0cafe5f81888fed16d2462;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/mm_phys.c b/Kernel/arch/x86/mm_phys.c
index bd8d60e4..3c7dcddc 100644
--- a/Kernel/arch/x86/mm_phys.c
+++ b/Kernel/arch/x86/mm_phys.c
@@ -15,10 +15,10 @@
 extern void	gKernelEnd;
 
 // === PROTOTYPES ===
-tPAddr	MM_AllocPhys();
+tPAddr	MM_AllocPhys(void);
 tPAddr	MM_AllocPhysRange(int Pages, int MaxBits);
-void	MM_RefPhys(tPAddr Addr);
-void	MM_DerefPhys(tPAddr Addr);
+void	MM_RefPhys(tPAddr PAddr);
+void	MM_DerefPhys(tPAddr PAddr);
 
 // === GLOBALS ===
 Uint64	giPhysAlloc = 0;	// Number of allocated pages
@@ -71,7 +71,7 @@ void MM_Install(tMBoot_Info *MBoot)
 		ent = (tMBoot_MMapEnt *)( (Uint)ent + ent->Size );
 	}
 	
-	// Get used page count
+	// Get used page count (Kernel)
 	kernelPages = (Uint)&gKernelEnd - KERNEL_BASE - 0x100000;
 	kernelPages += 0xFFF;	// Page Align
 	kernelPages >>= 12;
@@ -119,10 +119,10 @@ void MM_Install(tMBoot_Info *MBoot)
 }
 
 /**
- * \fn tPAddr MM_AllocPhys()
+ * \fn tPAddr MM_AllocPhys(void)
  * \brief Allocates a physical page from the general pool
  */
-tPAddr MM_AllocPhys()
+tPAddr MM_AllocPhys(void)
 {
 	// int	a, b, c;
 	 int	indx;
@@ -207,8 +207,13 @@ tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
 	 int	i, idx, sidx;
 	tPAddr	ret;
 	
+	ENTER("iPages iMaxBits", Pages, MaxBits);
+	
 	// Sanity Checks
-	if(MaxBits < 0)	return 0;
+	if(MaxBits < 0) {
+		LEAVE('i', 0);
+		return 0;
+	}
 	if(MaxBits > PHYS_BITS)	MaxBits = PHYS_BITS;
 	
 	// Lock
@@ -226,16 +231,28 @@ tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
 	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( ; gaSuperBitmap[a] == -1 && a --; );
+	for( ; gaSuperBitmap[a] == -1 && a --; )	b = 31;
 	if(a < 0) {
 		RELEASE( &giPhysAlloc );
 		Warning("MM_AllocPhysRange - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
+		LEAVE('i', 0);
 		return 0;
 	}
-	for( ; gaSuperBitmap[a] & (1 << b); b-- );
+	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-- );
+	for( ; gaPageBitmap[idx] & (1 << sidx); sidx-- )
+		LOG("gaPageBitmap[%i] = 0x%08x", idx, gaPageBitmap[idx]);
+	
+	LOG("idx = %i, sidx = %i", idx, sidx);
+	#else
+	
+	#endif
 	
 	// Check if the gap is large enough
 	while( idx >= 0 )
@@ -280,6 +297,8 @@ tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
 	if( idx < 0 ) {
 		RELEASE( &giPhysAlloc );
 		Warning("MM_AllocPhysRange - OUT OF MEMORY (Called by %p)", __builtin_return_address(0));
+		LEAVE('i', 0);
+		return 0;
 	}
 	
 	// Mark pages used
@@ -289,7 +308,7 @@ tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
 			gaPageReferences[idx*32+sidx] = 1;
 		gaPageBitmap[ idx ] |= 1 << sidx;
 		sidx ++;
-		if(sidx == 32) {	sidx = 0;	idx ++;	}
+		if(sidx == 32) { sidx = 0;	idx ++;	}
 	}
 	
 	// Get address
@@ -301,50 +320,53 @@ tPAddr MM_AllocPhysRange(int Pages, int MaxBits)
 	// Release Spinlock
 	RELEASE( &giPhysAlloc );
 	
+	LEAVE('X', ret);
 	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 );
 	
 	// Reference the page
 	if(gaPageReferences)
-		gaPageReferences[ Addr ] ++;
+		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 );
 }
 
 /**
- * \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) {
+	if(gaPageReferences[ PAddr ] == 0) {
 		Warning("MM_DerefPhys - Non-referenced memory dereferenced");
 		return;
 	}
@@ -352,16 +374,19 @@ void MM_DerefPhys(tPAddr Addr)
 	// Lock Structures
 	LOCK( &giPhysAlloc );
 	
+	if( giLastPossibleFree < PAddr )
+		giLastPossibleFree = PAddr;
+
 	// Dereference
-	gaPageReferences[ Addr ] --;
+	gaPageReferences[ PAddr ] --;
 	
 	// Mark as free in bitmaps
-	if( gaPageReferences[ Addr ] == 0 )
+	if( gaPageReferences[ PAddr ] == 0 )
 	{
-		//LOG("Freed 0x%x by %p\n", Addr<<12, __builtin_return_address(0));
-		gaPageBitmap[ Addr / 32 ] &= ~(1 << (Addr&31));
-		if(gaPageReferences[ Addr ] == 0)
-			gaSuperBitmap[ Addr >> 10 ] &= ~(1 << ((Addr >> 5)&31));
+		//LOG("Freed 0x%x by %p\n", PAddr<<12, __builtin_return_address(0));
+		gaPageBitmap[ PAddr / 32 ] &= ~(1 << (PAddr&31));
+		if(gaPageReferences[ PAddr ] == 0)
+			gaSuperBitmap[ PAddr >> 10 ] &= ~(1 << ((PAddr >> 5)&31));
 	}
 	
 	// Release spinlock