1 files changed, 178 insertions, 0 deletions

diff --git a/arch/avr32/include/asm/system.h b/arch/avr32/include/asm/system.h
new file mode 100644
index 000000000000..9702c2213e1e
--- /dev/null
+++ b/arch/avr32/include/asm/system.h
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_AVR32_SYSTEM_H
+#define __ASM_AVR32_SYSTEM_H
+
+#include <linux/compiler.h>
+#include <linux/linkage.h>
+#include <linux/types.h>
+
+#include <asm/ptrace.h>
+#include <asm/sysreg.h>
+
+#define xchg(ptr,x) \
+        ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+#define nop() asm volatile("nop")
+
+#define mb()                    asm volatile("" : : : "memory")
+#define rmb()                   mb()
+#define wmb()                   asm volatile("sync 0" : : : "memory")
+#define read_barrier_depends()  do { } while(0)
+#define set_mb(var, value)      do { var = value; mb(); } while(0)
+
+/*
+ * Help PathFinder and other Nexus-compliant debuggers keep track of
+ * the current PID by emitting an Ownership Trace Message each time we
+ * switch task.
+ */
+#ifdef CONFIG_OWNERSHIP_TRACE
+#include <asm/ocd.h>
+#define finish_arch_switch(prev)                        \
+        do {                                            \
+                ocd_write(PID, prev->pid);              \
+                ocd_write(PID, current->pid);           \
+        } while(0)
+#endif
+
+/*
+ * switch_to(prev, next, last) should switch from task `prev' to task
+ * `next'. `prev' will never be the same as `next'.
+ *
+ * We just delegate everything to the __switch_to assembly function,
+ * which is implemented in arch/avr32/kernel/switch_to.S
+ *
+ * mb() tells GCC not to cache `current' across this call.
+ */
+struct cpu_context;
+struct task_struct;
+extern struct task_struct *__switch_to(struct task_struct *,
+                                       struct cpu_context *,
+                                       struct cpu_context *);
+#define switch_to(prev, next, last)                                     \
+        do {                                                            \
+                last = __switch_to(prev, &prev->thread.cpu_context + 1, \
+                                   &next->thread.cpu_context);          \
+        } while (0)
+
+#ifdef CONFIG_SMP
+# error "The AVR32 port does not support SMP"
+#else
+# define smp_mb()               barrier()
+# define smp_rmb()              barrier()
+# define smp_wmb()              barrier()
+# define smp_read_barrier_depends() do { } while(0)
+#endif
+
+#include <linux/irqflags.h>
+
+extern void __xchg_called_with_bad_pointer(void);
+
+static inline unsigned long xchg_u32(u32 val, volatile u32 *m)
+{
+        u32 ret;
+
+        asm volatile("xchg %[ret], %[m], %[val]"
+                        : [ret] "=&r"(ret), "=m"(*m)
+                        : "m"(*m), [m] "r"(m), [val] "r"(val)
+                        : "memory");
+        return ret;
+}
+
+static inline unsigned long __xchg(unsigned long x,
+                                       volatile void *ptr,
+                                       int size)
+{
+        switch(size) {
+        case 4:
+                return xchg_u32(x, ptr);
+        default:
+                __xchg_called_with_bad_pointer();
+                return x;
+        }
+}
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+                                          unsigned long new)
+{
+        __u32 ret;
+
+        asm volatile(
+                "1:     ssrf    5\n"
+                "       ld.w    %[ret], %[m]\n"
+                "       cp.w    %[ret], %[old]\n"
+                "       brne    2f\n"
+                "       stcond  %[m], %[new]\n"
+                "       brne    1b\n"
+                "2:\n"
+                : [ret] "=&r"(ret), [m] "=m"(*m)
+                : "m"(m), [old] "ir"(old), [new] "r"(new)
+                : "memory", "cc");
+        return ret;
+}
+
+extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
+        volatile int * m, unsigned long old, unsigned long new);
+#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
+
+/* This function doesn't exist, so you'll get a linker error
+   if something tries to do an invalid cmpxchg().  */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
+#define __HAVE_ARCH_CMPXCHG 1
+
+static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
+                                      unsigned long new, int size)
+{
+        switch (size) {
+        case 4:
+                return __cmpxchg_u32(ptr, old, new);
+        case 8:
+                return __cmpxchg_u64(ptr, old, new);
+        }
+
+        __cmpxchg_called_with_bad_pointer();
+        return old;
+}
+
+#define cmpxchg(ptr, old, new)                                  \
+        ((typeof(*(ptr)))__cmpxchg((ptr), (unsigned long)(old), \
+                                   (unsigned long)(new),        \
+                                   sizeof(*(ptr))))
+
+#include <asm-generic/cmpxchg-local.h>
+
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+                                      unsigned long old,
+                                      unsigned long new, int size)
+{
+        switch (size) {
+        case 4:
+                return __cmpxchg_u32(ptr, old, new);
+        default:
+                return __cmpxchg_local_generic(ptr, old, new, size);
+        }
+
+        return old;
+}
+
+#define cmpxchg_local(ptr, old, new)                                    \
+        ((typeof(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(old),   \
+                                   (unsigned long)(new),                \
+                                   sizeof(*(ptr))))
+
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+struct pt_regs;
+void NORET_TYPE die(const char *str, struct pt_regs *regs, long err);
+void _exception(long signr, struct pt_regs *regs, int code,
+                unsigned long addr);
+
+#define arch_align_stack(x)     (x)
+
+#endif /* __ASM_AVR32_SYSTEM_H */