MdeModulePkg/RamDiskDxe: 4K align ram disk sizes

When a ram disk is passed to an OS through NFIT, page size is the smallest sensible granularity for a ram disk size. FreeBSD's nvdimm(4) driver will refuse to handle an SPA whose length is not zero module page size.
freebsd · Mar 28, 2019 · 976fc1f · 976fc1f
1 parent 64b23f4
commit 976fc1f
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskImpl.c b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskImpl.c
@@ -344,6 +344,8 @@ HiiCreateRamDisk (
   }
 
   if (Size > (UINTN) -1) {
+    // 4k align size for consumption by NFIT drivers
+    Size = (Size + 0xfff) & ~0xfffULL;
     do {
       CreatePopUp (
         EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE,