[reactos] 06/09: [NTOS:MM:X64] Implement MmCreatePageFileMapping and MmDeletePageFileMapping

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=9095dbf5a5e877fae5a62…

commit 9095dbf5a5e877fae5a62554d6a774adf35cb672
Author:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
AuthorDate: Sat Feb 10 22:45:45 2018 +0100
Commit:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
CommitDate: Sun Nov 1 09:32:27 2020 +0100

    [NTOS:MM:X64] Implement MmCreatePageFileMapping and MmDeletePageFileMapping
---
 ntoskrnl/mm/amd64/page.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/ntoskrnl/mm/amd64/page.c b/ntoskrnl/mm/amd64/page.c
index 0559de76b88..6b311fb34da 100644
--- a/ntoskrnl/mm/amd64/page.c
+++ b/ntoskrnl/mm/amd64/page.c
@@ -462,7 +462,23 @@ NTAPI
 MmDeletePageFileMapping(PEPROCESS Process, PVOID Address,
                         SWAPENTRY* SwapEntry)
 {
-    UNIMPLEMENTED;
+    PMMPTE Pte;
+
+    Pte = MiGetPteForProcess(Process, Address, FALSE);
+    if (Pte == NULL)
+    {
+        *SwapEntry = 0;
+        return;
+    }
+
+    if (Pte->u.Trans.Valid || !Pte->u.Trans.Transition)
+    {
+        DPRINT1("Pte %x (want not 1 and 0x800)\n", Pte);
+        KeBugCheck(MEMORY_MANAGEMENT);
+    }
+
+    *SwapEntry = Pte->u.Long >> 1;
+    MI_ERASE_PTE(Pte);
 }
 
 NTSTATUS
@@ -471,7 +487,36 @@ MmCreatePageFileMapping(PEPROCESS Process,
                         PVOID Address,
                         SWAPENTRY SwapEntry)
 {
-    UNIMPLEMENTED;
+    PMMPTE Pte;
+    MMPTE PteValue;
+
+    if (Process == NULL && Address < MmSystemRangeStart)
+    {
+        DPRINT1("No process\n");
+        KeBugCheck(MEMORY_MANAGEMENT);
+    }
+    if (Process != NULL && Address >= MmSystemRangeStart)
+    {
+        DPRINT1("Setting kernel address with process context\n");
+        KeBugCheck(MEMORY_MANAGEMENT);
+    }
+
+    if (SwapEntry & (1ull << 63))
+    {
+        KeBugCheck(MEMORY_MANAGEMENT);
+    }
+
+    /* Allocate a PTE */
+    Pte = MiGetPteForProcess(Process, Address, TRUE);
+    if (Pte == NULL)
+    {
+        return STATUS_UNSUCCESSFUL;
+    }
+
+    NT_ASSERT(Pte->u.Long == 0);
+    PteValue.u.Long = SwapEntry << 1;
+    MI_WRITE_INVALID_PTE(Pte, PteValue);
+
     return STATUS_UNSUCCESSFUL;
 }