Disintegrate asm/system.h for M68K

Disintegrate asm/system.h for M68K.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
cc: linux-m68k@lists.linux-m68k.org

arch/m68k/amiga/amisound.c

@@ -14,7 +14,6 @@
 #include <linux/string.h>
 #include <linux/module.h>
 
-#include <asm/system.h>
 #include <asm/amigahw.h>
 
 static unsigned short *snd_data;

arch/m68k/amiga/config.c

@@ -29,7 +29,6 @@
 
 #include <asm/bootinfo.h>
 #include <asm/setup.h>
-#include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/amigahw.h>
 #include <asm/amigaints.h>

arch/m68k/apollo/config.c

@@ -9,7 +9,6 @@
 
 #include <asm/setup.h>
 #include <asm/bootinfo.h>
-#include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/apollohw.h>
 #include <asm/irq.h>

arch/m68k/atari/ataints.c

@@ -42,7 +42,6 @@
 #include <linux/seq_file.h>
 #include <linux/module.h>
 
-#include <asm/system.h>
 #include <asm/traps.h>
 
 #include <asm/atarihw.h>

arch/m68k/atari/atasound.c

@@ -25,7 +25,6 @@
 #include <linux/module.h>
 
 #include <asm/atarihw.h>
-#include <asm/system.h>
 #include <asm/irq.h>
 #include <asm/pgtable.h>
 #include <asm/atariints.h>

arch/m68k/atari/config.c

@@ -39,7 +39,6 @@
 #include <asm/atarihw.h>
 #include <asm/atariints.h>
 #include <asm/atari_stram.h>
-#include <asm/system.h>
 #include <asm/machdep.h>
 #include <asm/hwtest.h>
 #include <asm/io.h>

arch/m68k/bvme6000/config.c

@@ -28,7 +28,6 @@
 #include <linux/bcd.h>
 
 #include <asm/bootinfo.h>
-#include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/setup.h>
 #include <asm/irq.h>

arch/m68k/bvme6000/rtc.c

@@ -21,7 +21,6 @@
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
-#include <asm/system.h>
 #include <asm/setup.h>
 
 /*

arch/m68k/hp300/time.c

@@ -15,7 +15,6 @@
 #include <asm/machdep.h>
 #include <asm/irq.h>
 #include <asm/io.h>
-#include <asm/system.h>
 #include <asm/traps.h>
 #include <asm/blinken.h>
 

arch/m68k/include/asm/atomic.h

@@ -2,7 +2,7 @@
 #define __ARCH_M68K_ATOMIC__
 
 #include <linux/types.h>
-#include <asm/system.h>
+#include <linux/irqflags.h>
 
 /*
  * Atomic operations that C can't guarantee us.  Useful for

arch/m68k/include/asm/barrier.h

@@ -0,0 +1,20 @@
+#ifndef _M68K_BARRIER_H
+#define _M68K_BARRIER_H
+
+/*
+ * Force strict CPU ordering.
+ * Not really required on m68k...
+ */
+#define nop()		do { asm volatile ("nop"); barrier(); } while (0)
+#define mb()		barrier()
+#define rmb()		barrier()
+#define wmb()		barrier()
+#define read_barrier_depends()	((void)0)
+#define set_mb(var, value)	({ (var) = (value); wmb(); })
+
+#define smp_mb()	barrier()
+#define smp_rmb()	barrier()
+#define smp_wmb()	barrier()
+#define smp_read_barrier_depends()	((void)0)
+
+#endif /* _M68K_BARRIER_H */

arch/m68k/include/asm/cmpxchg.h

@@ -0,0 +1,141 @@
+#ifndef __ARCH_M68K_CMPXCHG__
+#define __ARCH_M68K_CMPXCHG__
+
+#include <linux/irqflags.h>
+
+struct __xchg_dummy { unsigned long a[100]; };
+#define __xg(x) ((volatile struct __xchg_dummy *)(x))
+
+extern unsigned long __invalid_xchg_size(unsigned long, volatile void *, int);
+
+#ifndef CONFIG_RMW_INSNS
+static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
+{
+	unsigned long flags, tmp;
+
+	local_irq_save(flags);
+
+	switch (size) {
+	case 1:
+		tmp = *(u8 *)ptr;
+		*(u8 *)ptr = x;
+		x = tmp;
+		break;
+	case 2:
+		tmp = *(u16 *)ptr;
+		*(u16 *)ptr = x;
+		x = tmp;
+		break;
+	case 4:
+		tmp = *(u32 *)ptr;
+		*(u32 *)ptr = x;
+		x = tmp;
+		break;
+	default:
+		tmp = __invalid_xchg_size(x, ptr, size);
+		break;
+	}
+
+	local_irq_restore(flags);
+	return x;
+}
+#else
+static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
+{
+	switch (size) {
+	case 1:
+		__asm__ __volatile__
+			("moveb %2,%0\n\t"
+			 "1:\n\t"
+			 "casb %0,%1,%2\n\t"
+			 "jne 1b"
+			 : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	case 2:
+		__asm__ __volatile__
+			("movew %2,%0\n\t"
+			 "1:\n\t"
+			 "casw %0,%1,%2\n\t"
+			 "jne 1b"
+			 : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	case 4:
+		__asm__ __volatile__
+			("movel %2,%0\n\t"
+			 "1:\n\t"
+			 "casl %0,%1,%2\n\t"
+			 "jne 1b"
+			 : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	default:
+		x = __invalid_xchg_size(x, ptr, size);
+		break;
+	}
+	return x;
+}
+#endif
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+#include <asm-generic/cmpxchg-local.h>
+
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+extern unsigned long __invalid_cmpxchg_size(volatile void *,
+					    unsigned long, unsigned long, int);
+
+/*
+ * Atomic compare and exchange.  Compare OLD with MEM, if identical,
+ * store NEW in MEM.  Return the initial value in MEM.  Success is
+ * indicated by comparing RETURN with OLD.
+ */
+#ifdef CONFIG_RMW_INSNS
+#define __HAVE_ARCH_CMPXCHG	1
+
+static inline unsigned long __cmpxchg(volatile void *p, unsigned long old,
+				      unsigned long new, int size)
+{
+	switch (size) {
+	case 1:
+		__asm__ __volatile__ ("casb %0,%2,%1"
+				      : "=d" (old), "=m" (*(char *)p)
+				      : "d" (new), "0" (old), "m" (*(char *)p));
+		break;
+	case 2:
+		__asm__ __volatile__ ("casw %0,%2,%1"
+				      : "=d" (old), "=m" (*(short *)p)
+				      : "d" (new), "0" (old), "m" (*(short *)p));
+		break;
+	case 4:
+		__asm__ __volatile__ ("casl %0,%2,%1"
+				      : "=d" (old), "=m" (*(int *)p)
+				      : "d" (new), "0" (old), "m" (*(int *)p));
+		break;
+	default:
+		old = __invalid_cmpxchg_size(p, old, new, size);
+		break;
+	}
+	return old;
+}
+
+#define cmpxchg(ptr, o, n)						    \
+	((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o),	    \
+			(unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg_local(ptr, o, n)					    \
+	((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o),	    \
+			(unsigned long)(n), sizeof(*(ptr))))
+#else
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)				  	       \
+	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+			(unsigned long)(n), sizeof(*(ptr))))
+
+#include <asm-generic/cmpxchg.h>
+
+#endif
+
+#endif /* __ARCH_M68K_CMPXCHG__ */

arch/m68k/include/asm/exec.h

@@ -0,0 +1,6 @@
+#ifndef _M68K_EXEC_H
+#define _M68K_EXEC_H
+
+#define arch_align_stack(x) (x)
+
+#endif /* _M68K_EXEC_H */

arch/m68k/include/asm/sun3xflop.h

@@ -11,7 +11,6 @@
 
 #include <asm/page.h>
 #include <asm/pgtable.h>
-#include <asm/system.h>
 #include <asm/irq.h>
 #include <asm/sun3x.h>
 

arch/m68k/include/asm/switch_to.h

@@ -0,0 +1,41 @@
+#ifndef _M68K_SWITCH_TO_H
+#define _M68K_SWITCH_TO_H
+
+/*
+ * switch_to(n) should switch tasks to task ptr, first checking that
+ * ptr isn't the current task, in which case it does nothing.  This
+ * also clears the TS-flag if the task we switched to has used the
+ * math co-processor latest.
+ */
+/*
+ * switch_to() saves the extra registers, that are not saved
+ * automatically by SAVE_SWITCH_STACK in resume(), ie. d0-d5 and
+ * a0-a1. Some of these are used by schedule() and its predecessors
+ * and so we might get see unexpected behaviors when a task returns
+ * with unexpected register values.
+ *
+ * syscall stores these registers itself and none of them are used
+ * by syscall after the function in the syscall has been called.
+ *
+ * Beware that resume now expects *next to be in d1 and the offset of
+ * tss to be in a1. This saves a few instructions as we no longer have
+ * to push them onto the stack and read them back right after.
+ *
+ * 02/17/96 - Jes Sorensen (jds@kom.auc.dk)
+ *
+ * Changed 96/09/19 by Andreas Schwab
+ * pass prev in a0, next in a1
+ */
+asmlinkage void resume(void);
+#define switch_to(prev,next,last) do { \
+  register void *_prev __asm__ ("a0") = (prev); \
+  register void *_next __asm__ ("a1") = (next); \
+  register void *_last __asm__ ("d1"); \
+  __asm__ __volatile__("jbsr resume" \
+		       : "=a" (_prev), "=a" (_next), "=d" (_last) \
+		       : "0" (_prev), "1" (_next) \
+		       : "d0", "d2", "d3", "d4", "d5"); \
+  (last) = _last; \
+} while (0)
+
+#endif /* _M68K_SWITCH_TO_H */