From 9fe3d3cbcc1969619b5fcd5bd8fb55bedcbdcd43 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Tue, 10 Feb 2015 23:37:52 +0000
Subject: [PATCH] lowlevel-z80-banked: remove the NULL checker if low memory is
 not userspace

---
 Kernel/lowlevel-z80-banked.s | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Kernel/lowlevel-z80-banked.s b/Kernel/lowlevel-z80-banked.s
index 8789c993..c040a693 100644
--- a/Kernel/lowlevel-z80-banked.s
+++ b/Kernel/lowlevel-z80-banked.s
@@ -328,8 +328,8 @@ interrupt_handler:
 	    ld a, (_kernel_flag)
 	    or a
 	    push af
+.ifeq PROGBASE
 	    jr nz, in_kernel
-
             ; we're not in kernel mode, check for signals and fault
 	    ld a, #0xC3
 	    cp b		; should be a jump
@@ -343,6 +343,7 @@ interrupt_handler:
 
 nofault:
 in_kernel:
+.endif
             ; set inint to true
             ld a, #1
             ld (_inint), a
-- 
2.34.1