ptos/amd64+hal: Add page unmap interface

Signed-off-by: Chloe M <chloe@mensia.org>
2026-07-11 05:18:36 -04:00
parent 770ffe39ac
commit e03a6d0e91
2 changed files with 39 additions and 0 deletions
@@ -231,3 +231,30 @@ HalMmuMapPage(
    MdTlbFlushSingle(VirtualBase);
    return STATUS_SUCCESS;
 }
+
+PT_STATUS
+HalMmuUnmapPage(MMU_VAS *Vas, UPTR VirtualBase, MMU_PAGESIZE PageSize)
+{
+    UPTR *PageTable;
+    USIZE PageTableIndex;
+
+    if (Vas == NULL) {
+        return STATUS_INVALID_PARAM;
+    }
+
+    if (!MmuPageSizeValid(PageSize)) {
+        return STATUS_INVALID_PARAM;
+    }
+
+    PageTable = MmuPageMapExtract(Vas, VirtualBase, PAGEMAP_PML1, false);
+    if (PageTable == NULL) {
+        return STATUS_NOT_FOUND;
+    }
+
+    PageTableIndex = MmuPageMapIndex(VirtualBase, PAGEMAP_PML1);
+
+    /* Unmap and flush the TLB */
+    PageTable[PageTableIndex] = 0;
+    MdTlbFlushSingle(VirtualBase);
+    return STATUS_SUCCESS;
+}