ptos/amd64+hal: Add virtual address space forking

Signed-off-by: Chloe M. <chloe@mensia.org>
2026-07-14 21:25:51 +00:00
parent 7fa508bdf3
commit 181b0fdf61
3 changed files with 55 additions and 1 deletions
@@ -260,3 +260,37 @@ HalMmuUnmapPage(MMU_VAS *Vas, UPTR VirtualBase, MMU_PAGESIZE PageSize)
    MdTlbFlushSingle(VirtualBase);
    return STATUS_SUCCESS;
 }
+
+PT_STATUS
+HalMmuForkVas(const MMU_VAS *Source, MMU_VAS *Result)
+{
+    const UPTR *Src;
+    UPTR *Dest;
+    UPTR DestPhysBase;
+    MM_PFN DestPfn;
+
+    if (Source == NULL || Result == NULL) {
+        return STATUS_INVALID_PARAM;
+    }
+
+    DestPfn = MmRequestFrame();
+    if (DestPfn == PFN_ERROR) {
+        return STATUS_NO_MEMORY;
+    }
+
+    DestPhysBase = PFN_TO_ADDRESS(DestPfn);
+    Src = PMA_TO_VMA((Source->Cr3 & PTE_ADDR_MASK));
+    Dest = PMA_TO_VMA(DestPhysBase);
+
+    /* Begin copy */
+    for (USIZE Idx = 0; Idx < 512; ++Idx) {
+        if (Idx < 256) {
+            Dest[Idx] = 0;
+        } else {
+            Dest[Idx] = Src[Idx];
+        }
+    }
+
+    Result->Cr3 = DestPhysBase;
+    return STATUS_SUCCESS;
+}