stos: pmm: Add physical frame allocation

Signed-off-by: Chloe M. <chloe@mensia.org>
2026-06-22 06:50:36 +00:00
parent ef0588512c
commit df1719fbd0
2 changed files with 28 additions and 0 deletions
@@ -13,6 +13,7 @@
 #include <hal/page.h>
 #include <units.h>
 #include <stdef.h>
+#include <string.h>

 #define LOAD_DELAY 128

@@ -159,6 +160,22 @@ MmLoadUpdate(VOID)
    LoadIdx %= LoadMax;
 }

+MM_PFN
+MmRequestFrame(VOID)
+{
+    MM_PFD *Pfd;
+    UPTR Pma;
+
+    Pfd = MmPfdPop(&PfdList);
+    if (Pfd == NULL) {
+        return 0;
+    }
+
+    RtlMemSet(Pfd, 0, PAGESIZE);
+    Pma = VMA_TO_PMA(Pfd);
+    return Pma >> LOG2_PAGESIZE;
+}
+
 static VOID
 MmProbeMemory(VOID)
 {