X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=ArmPkg%2FLibrary%2FArmLib%2FArm%2FArmLibSupport.asm;h=3eb52875971d76565867665c2cbe9fe5516904dd;hp=219140c22b131884ec1f339f90f28d4e58b7dfe3;hb=95d04ebca8be8f71a23e85a2f4822ba90a2e32cc;hpb=82379bf6603274e81604d5a6f6bb14bdde616286

diff --git a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
index 219140c22b..3eb5287597 100644
--- a/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
+++ b/ArmPkg/Library/ArmLib/Arm/ArmLibSupport.asm
@@ -169,4 +169,12 @@
   isb
   bx      lr
 
+ RVCT_ASM_EXPORT ArmGetPhysicalAddressBits
+  mrc     p15, 0, r0, c0, c1, 4   ; MMFR0
+  and     r0, r0, #0xf            ; VMSA [3:0]
+  cmp     r0, #5                  ; >= 5 implies LPAE support
+  movlt   r0, #32                 ; 32 bits if no LPAE
+  movge   r0, #40                 ; 40 bits if LPAE
+  bx      lr
+
   END