Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-12-28 18:15:11 +00:00
Code Issues Projects Releases Packages Wiki Activity

Check the length of the gap if this starts at the begin or end of the area in MmFindGap.

Browse source 
svn path=/trunk/; revision=4099
This commit is contained in:
Hartmut Birr 2003-02-02 08:55:51 +00:00
parent f0fd058aef
commit f979d1b237
1 changed files with 23 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
reactos/ntoskrnl/mm/marea.c
View file

@ -212,6 +212,7 @@ PVOID MmFindGap(PMADDRESS_SPACE AddressSpace, ULONG Length)
MEMORY_AREA* current; MEMORY_AREA* current;
MEMORY_AREA* next; MEMORY_AREA* next;
ULONG Gap; ULONG Gap;
PVOID Address;
DPRINT("MmFindGap(Length %x)\n",Length); DPRINT("MmFindGap(Length %x)\n",Length);
@ -232,11 +233,29 @@ PVOID MmFindGap(PMADDRESS_SPACE AddressSpace, ULONG Length)
if (current_entry == ListHead) if (current_entry == ListHead)
{ {
return((PVOID)AddressSpace->LowestAddress); Address = (PVOID)AddressSpace->LowestAddress;
} }
else
{
current = CONTAINING_RECORD(current_entry,MEMORY_AREA,Entry); current = CONTAINING_RECORD(current_entry,MEMORY_AREA,Entry);
return(current->BaseAddress + PAGE_ROUND_UP(current->Length)); Address = current->BaseAddress + PAGE_ROUND_UP(current->Length);
}
/* Check if enough space for the block */
if (AddressSpace->LowestAddress < KERNEL_BASE)
{
if ((ULONG)Address >= KERNEL_BASE || Length > KERNEL_BASE - (ULONG)Address)
{
return NULL;
}
}
else
{
if (Length >= 0xFFFFFFFF - (ULONG)Address)
{
return NULL;
}
}
return Address;
} }
NTSTATUS MmInitMemoryAreas(VOID) NTSTATUS MmInitMemoryAreas(VOID)