X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Farch%2Fx86%2Fmm_virt.c;h=72c40c2a84b7be751ab2ddbfc1b5ef98307ed586;hb=046980a1afd982af07dc97aaadb186e31eebb340;hp=2b2f02c15979cccb92d1319b2b46958e56eeb551;hpb=8051546ad5894e093211d2ec69dde6b99cdaa71d;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/mm_virt.c b/Kernel/arch/x86/mm_virt.c
index 2b2f02c1..72c40c2a 100644
--- a/Kernel/arch/x86/mm_virt.c
+++ b/Kernel/arch/x86/mm_virt.c
@@ -56,7 +56,7 @@
 #define	PF_WRITE	0x2
 #define	PF_USER		0x4
 #define	PF_COW		0x200
-#define	PF_PAGED	0x400
+#define	PF_NOPAGE	0x400
 
 #define INVLPG(addr)	__asm__ __volatile__ ("invlpg (%0)"::"r"(addr))
 
@@ -78,6 +78,7 @@ void	MM_PreinitVirtual(void);
 void	MM_InstallVirtual(void);
 void	MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs);
 void	MM_DumpTables(tVAddr Start, tVAddr End);
+tVAddr	MM_ClearUser(void);
 tPAddr	MM_DuplicatePage(tVAddr VAddr);
 
 // === GLOBALS ===
@@ -217,6 +218,9 @@ void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs)
 			);
 		Warning("User Pagefault: Instruction at %04x:%08x accessed %p", Regs->cs, Regs->eip, Addr);
 		__asm__ __volatile__ ("sti");	// Restart IRQs
+		#if 1
+		Error_Backtrace(Regs->eip, Regs->ebp);
+		#endif
 		Threads_SegFault(Addr);
 		return ;
 	}
@@ -306,7 +310,7 @@ void MM_DumpTables(tVAddr Start, tVAddr End)
 					rangeStart, curPos - 1,
 					gaPageTable[rangeStart>>12] & ~0xFFF,
 					(expected & ~0xFFF) - 1,
-					(expected & PF_PAGED ? "p" : "-"),
+					(expected & PF_NOPAGE ? "P" : "-"),
 					(expected & PF_COW ? "C" : "-"),
 					(expected & PF_USER ? "U" : "-"),
 					(expected & PF_WRITE ? "W" : "-")
@@ -327,7 +331,7 @@ void MM_DumpTables(tVAddr Start, tVAddr End)
 			rangeStart, curPos - 1,
 			gaPageTable[rangeStart>>12] & ~0xFFF,
 			(expected & ~0xFFF) - 1,
-			(expected & PF_PAGED ? "p" : "-"),
+			(expected & PF_NOPAGE ? "p" : "-"),
 			(expected & PF_COW ? "C" : "-"),
 			(expected & PF_USER ? "U" : "-"),
 			(expected & PF_WRITE ? "W" : "-")
@@ -660,14 +664,28 @@ tVAddr MM_NewKStack(void)
 	Uint	i;
 	for(base = KERNEL_STACKS; base < KERNEL_STACKS_END; base += KERNEL_STACK_SIZE)
 	{
+		// Check if space is free
 		if(MM_GetPhysAddr(base) != 0)	continue;
-		for(i = 0; i < KERNEL_STACK_SIZE; i += 0x1000) {
-			MM_Allocate(base+i);
+		// Allocate
+		//for(i = KERNEL_STACK_SIZE; i -= 0x1000 ; )
+		for(i = 0; i < KERNEL_STACK_SIZE; i += 0x1000 )
+		{
+			if( MM_Allocate(base+i) == 0 )
+			{
+				// On error, print a warning and return error
+				Warning("MM_NewKStack - Out of memory");
+				// - Clean up
+				//for( i += 0x1000 ; i < KERNEL_STACK_SIZE; i += 0x1000 )
+				//	MM_Deallocate(base+i);
+				return 0;
+			}
 		}
+		// Success
 		Log("MM_NewKStack - Allocated %p", base + KERNEL_STACK_SIZE);
 		return base+KERNEL_STACK_SIZE;
 	}
-	Warning("MM_NewKStack - No address space left\n");
+	// No stacks left
+	Warning("MM_NewKStack - No address space left");
 	return 0;
 }