From d1ffd141dbfcde8b1e15712d2fd9fcbfac441858 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Sat, 19 Jan 2019 16:25:49 +0000
Subject: [PATCH] cpu: add a barrier() macro

---
 Kernel/cpu-6502/cpu.h    | 1 +
 Kernel/cpu-65c816/cpu.h  | 1 +
 Kernel/cpu-68000/cpu.h   | 1 +
 Kernel/cpu-6809/cpu.h    | 1 +
 Kernel/cpu-68hc11/cpu.h  | 1 +
 Kernel/cpu-8086/cpu.h    | 1 +
 Kernel/cpu-msp430x/cpu.h | 1 +
 Kernel/cpu-pdp11/cpu.h   | 2 ++
 Kernel/cpu-z80/cpu.h     | 1 +
 9 files changed, 10 insertions(+)

diff --git a/Kernel/cpu-6502/cpu.h b/Kernel/cpu-6502/cpu.h
index 5aa5f383..9796f8cc 100644
--- a/Kernel/cpu-6502/cpu.h
+++ b/Kernel/cpu-6502/cpu.h
@@ -71,3 +71,4 @@ typedef union {            /* this structure is endian dependent */
 #define HIBYTE32(x)	(((uint8_t *)&(x))[3])
 
 #define __packed
+#define barrier()
diff --git a/Kernel/cpu-65c816/cpu.h b/Kernel/cpu-65c816/cpu.h
index 2a3c4a30..1016e3a0 100644
--- a/Kernel/cpu-65c816/cpu.h
+++ b/Kernel/cpu-65c816/cpu.h
@@ -78,3 +78,4 @@ typedef union {            /* this structure is endian dependent */
 #define regptr	register
 
 #define __packed
+#define barrier()
diff --git a/Kernel/cpu-68000/cpu.h b/Kernel/cpu-68000/cpu.h
index 35561efe..9e4cbac4 100644
--- a/Kernel/cpu-68000/cpu.h
+++ b/Kernel/cpu-68000/cpu.h
@@ -79,3 +79,4 @@ register struct u_data *udata_ptr asm ("a5");
 #define CPUTYPE	CPUTYPE_68000
 
 #define __packed		__attribute__((packed))
+#define barrier()		asm volatile("":::"memory")
diff --git a/Kernel/cpu-6809/cpu.h b/Kernel/cpu-6809/cpu.h
index 0ba8e112..8d0322a2 100644
--- a/Kernel/cpu-6809/cpu.h
+++ b/Kernel/cpu-6809/cpu.h
@@ -72,3 +72,4 @@ typedef union {            /* this structure is endian dependent */
 
 #define CPUTYPE	CPUTYPE_6809
 #define __packed		__attribute__((packed))
+#define barrier()		asm volatile("":::"memory")
diff --git a/Kernel/cpu-68hc11/cpu.h b/Kernel/cpu-68hc11/cpu.h
index 6faac2b5..167f461b 100644
--- a/Kernel/cpu-68hc11/cpu.h
+++ b/Kernel/cpu-68hc11/cpu.h
@@ -70,3 +70,4 @@ typedef union {            /* this structure is endian dependent */
 #define CPUTYPE	CPUTYPE_68HC11
 
 #define __packed		__attribute__((packed))
+#define barrier()		asm volatile("":::"memory")
diff --git a/Kernel/cpu-8086/cpu.h b/Kernel/cpu-8086/cpu.h
index ce2ae6c1..6c70834a 100644
--- a/Kernel/cpu-8086/cpu.h
+++ b/Kernel/cpu-8086/cpu.h
@@ -95,3 +95,4 @@ static inline uint8_t inb(uint16_t port)
 
 #define CPUTYPE	CPUTYPE_8086
 #define __packed		__attribute__((packed))
+#define barrier()		asm volatile("":::"memory")
diff --git a/Kernel/cpu-msp430x/cpu.h b/Kernel/cpu-msp430x/cpu.h
index 03037c32..8b3b6092 100644
--- a/Kernel/cpu-msp430x/cpu.h
+++ b/Kernel/cpu-msp430x/cpu.h
@@ -120,3 +120,4 @@ typedef union {            /* this structure is endian dependent */
 
 #define CPUTYPE	CPUTYPE_MSP340X
 #define __packed		__attribute__((packed))
+#define barrier()		asm volatile("":::"memory")
diff --git a/Kernel/cpu-pdp11/cpu.h b/Kernel/cpu-pdp11/cpu.h
index 961f92cf..de638e4f 100644
--- a/Kernel/cpu-pdp11/cpu.h
+++ b/Kernel/cpu-pdp11/cpu.h
@@ -78,3 +78,5 @@ typedef union {            /* this structure is endian dependent */
 #define PDP_ENDIAN
 
 #define CPUTYPE	CPUTYPE_PDP11
+
+#define barrier()		asm volatile("":::"memory")
diff --git a/Kernel/cpu-z80/cpu.h b/Kernel/cpu-z80/cpu.h
index 172d681e..add210b1 100644
--- a/Kernel/cpu-z80/cpu.h
+++ b/Kernel/cpu-z80/cpu.h
@@ -94,3 +94,4 @@ typedef union {            /* this structure is endian dependent */
    padding either */
 
 #define __packed
+#define barrier()
-- 
2.34.1