From 7254fe003b62e0db4828960d4399a0c5941b103d Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Tue, 10 Apr 2018 13:29:11 +0100
Subject: [PATCH] pcw8256: add now required copy_common method

Lots more needed to make this platform work
---
 Kernel/platform-pcw8256/pcw8256.s | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Kernel/platform-pcw8256/pcw8256.s b/Kernel/platform-pcw8256/pcw8256.s
index 3e1807ed..ce876259 100644
--- a/Kernel/platform-pcw8256/pcw8256.s
+++ b/Kernel/platform-pcw8256/pcw8256.s
@@ -15,6 +15,7 @@
 	    .globl map_save
 	    .globl map_restore
 	    .globl platform_interrupt_all
+	    .globl _copy_common
 
             ; exported debugging tools
             .globl _platform_monitor
@@ -236,6 +237,23 @@ map_restore:push hl
             pop hl
             ret
 
+;
+;	Make a copy of common into a new page in order to use it for a
+;	process.
+;
+_copy_common:
+	    pop hl
+	    pop de
+	    push de
+	    push hl
+	    ld a,e
+	    out (0xf1),a	; 4000-7FFF
+	    ld hl,#0xF000
+	    ld de,#0x7000
+	    ld bc,#0x1000
+	    ldir
+	    jr map_kernel
+
 
 _bugout:    pop hl
 	    pop bc
-- 
2.34.1