fix GPAW mask in the reset vector

GPAW is the [0:6] bit of ESP. the current mask 0x2f does not extract the 5th bit. 0x3f is the correct bitmask. this should close issue #734 Signed-off-by: Yu Ding <[email protected]>
confidential-containers · Sep 10, 2024 · 0877d44 · 0877d44
1 parent 66f0aaf
commit 0877d44
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/td-shim/ResetVector/Ia32/Flat32ToFlat64.asm b/td-shim/ResetVector/Ia32/Flat32ToFlat64.asm
@@ -22,7 +22,7 @@ Transition32FlatTo64Flat:
     ; LA57 and use 5-level paging
     ;
     mov     ecx, esp
-    and     ecx, 0x2f
+    and     ecx, 0x3f
     cmp     ecx, 52
     jl      .set_cr4
     bts     eax, 12