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-rw-r--r--arch/frv/include/asm/atomic.h57
-rw-r--r--arch/frv/include/asm/barrier.h29
-rw-r--r--arch/frv/include/asm/bug.h2
-rw-r--r--arch/frv/include/asm/cmpxchg.h (renamed from arch/frv/include/asm/system.h)98
-rw-r--r--arch/frv/include/asm/exec.h17
-rw-r--r--arch/frv/include/asm/switch_to.h35
6 files changed, 140 insertions, 98 deletions
diff --git a/arch/frv/include/asm/atomic.h b/arch/frv/include/asm/atomic.h
index 0d8a7d66174..b86329d0e31 100644
--- a/arch/frv/include/asm/atomic.h
+++ b/arch/frv/include/asm/atomic.h
@@ -16,7 +16,7 @@
#include <linux/types.h>
#include <asm/spr-regs.h>
-#include <asm/system.h>
+#include <asm/cmpxchg.h>
#ifdef CONFIG_SMP
#error not SMP safe
@@ -181,61 +181,6 @@ static inline void atomic64_dec(atomic64_t *v)
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
#define atomic64_inc_and_test(v) (atomic64_inc_return((v)) == 0)
-/*****************************************************************************/
-/*
- * exchange value with memory
- */
-extern uint64_t __xchg_64(uint64_t i, volatile void *v);
-
-#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
-
-#define xchg(ptr, x) \
-({ \
- __typeof__(ptr) __xg_ptr = (ptr); \
- __typeof__(*(ptr)) __xg_orig; \
- \
- switch (sizeof(__xg_orig)) { \
- case 4: \
- asm volatile( \
- "swap%I0 %M0,%1" \
- : "+m"(*__xg_ptr), "=r"(__xg_orig) \
- : "1"(x) \
- : "memory" \
- ); \
- break; \
- \
- default: \
- __xg_orig = (__typeof__(__xg_orig))0; \
- asm volatile("break"); \
- break; \
- } \
- \
- __xg_orig; \
-})
-
-#else
-
-extern uint32_t __xchg_32(uint32_t i, volatile void *v);
-
-#define xchg(ptr, x) \
-({ \
- __typeof__(ptr) __xg_ptr = (ptr); \
- __typeof__(*(ptr)) __xg_orig; \
- \
- switch (sizeof(__xg_orig)) { \
- case 4: __xg_orig = (__typeof__(*(ptr))) __xchg_32((uint32_t) x, __xg_ptr); break; \
- default: \
- __xg_orig = (__typeof__(__xg_orig))0; \
- asm volatile("break"); \
- break; \
- } \
- __xg_orig; \
-})
-
-#endif
-
-#define tas(ptr) (xchg((ptr), 1))
-
#define atomic_cmpxchg(v, old, new) (cmpxchg(&(v)->counter, old, new))
#define atomic_xchg(v, new) (xchg(&(v)->counter, new))
#define atomic64_cmpxchg(v, old, new) (__cmpxchg_64(old, new, &(v)->counter))
diff --git a/arch/frv/include/asm/barrier.h b/arch/frv/include/asm/barrier.h
new file mode 100644
index 00000000000..06776ad9f5e
--- /dev/null
+++ b/arch/frv/include/asm/barrier.h
@@ -0,0 +1,29 @@
+/* FR-V CPU memory barrier definitions
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_BARRIER_H
+#define _ASM_BARRIER_H
+
+#define nop() asm volatile ("nop"::)
+
+#define mb() asm volatile ("membar" : : :"memory")
+#define rmb() asm volatile ("membar" : : :"memory")
+#define wmb() asm volatile ("membar" : : :"memory")
+#define read_barrier_depends() do { } while (0)
+
+#define smp_mb() barrier()
+#define smp_rmb() barrier()
+#define smp_wmb() barrier()
+#define smp_read_barrier_depends() do {} while(0)
+#define set_mb(var, value) \
+ do { var = (value); barrier(); } while (0)
+
+#endif /* _ASM_BARRIER_H */
diff --git a/arch/frv/include/asm/bug.h b/arch/frv/include/asm/bug.h
index 2e054508a2f..dd01bcf42ee 100644
--- a/arch/frv/include/asm/bug.h
+++ b/arch/frv/include/asm/bug.h
@@ -51,4 +51,6 @@ do { \
#include <asm-generic/bug.h>
+extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2)));
+
#endif
diff --git a/arch/frv/include/asm/system.h b/arch/frv/include/asm/cmpxchg.h
index 6c10fd2c626..5b04dd0aeca 100644
--- a/arch/frv/include/asm/system.h
+++ b/arch/frv/include/asm/cmpxchg.h
@@ -1,6 +1,9 @@
-/* system.h: FR-V CPU control definitions
+/* xchg and cmpxchg operation emulation for FR-V
*
- * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * For an explanation of how atomic ops work in this arch, see:
+ * Documentation/frv/atomic-ops.txt
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -8,54 +11,65 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
-
-#ifndef _ASM_SYSTEM_H
-#define _ASM_SYSTEM_H
+#ifndef _ASM_CMPXCHG_H
+#define _ASM_CMPXCHG_H
#include <linux/types.h>
-#include <linux/linkage.h>
-#include <linux/kernel.h>
-
-struct thread_struct;
+/*****************************************************************************/
/*
- * switch_to(prev, next) should switch from task `prev' to `next'
- * `prev' will never be the same as `next'.
- * The `mb' is to tell GCC not to cache `current' across this call.
+ * exchange value with memory
*/
-extern asmlinkage
-struct task_struct *__switch_to(struct thread_struct *prev_thread,
- struct thread_struct *next_thread,
- struct task_struct *prev);
-
-#define switch_to(prev, next, last) \
-do { \
- (prev)->thread.sched_lr = \
- (unsigned long) __builtin_return_address(0); \
- (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
- mb(); \
-} while(0)
+extern uint64_t __xchg_64(uint64_t i, volatile void *v);
-/*
- * Force strict CPU ordering.
- */
-#define nop() asm volatile ("nop"::)
-#define mb() asm volatile ("membar" : : :"memory")
-#define rmb() asm volatile ("membar" : : :"memory")
-#define wmb() asm volatile ("membar" : : :"memory")
-#define read_barrier_depends() do { } while (0)
+#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
+
+#define xchg(ptr, x) \
+({ \
+ __typeof__(ptr) __xg_ptr = (ptr); \
+ __typeof__(*(ptr)) __xg_orig; \
+ \
+ switch (sizeof(__xg_orig)) { \
+ case 4: \
+ asm volatile( \
+ "swap%I0 %M0,%1" \
+ : "+m"(*__xg_ptr), "=r"(__xg_orig) \
+ : "1"(x) \
+ : "memory" \
+ ); \
+ break; \
+ \
+ default: \
+ __xg_orig = (__typeof__(__xg_orig))0; \
+ asm volatile("break"); \
+ break; \
+ } \
+ \
+ __xg_orig; \
+})
-#define smp_mb() barrier()
-#define smp_rmb() barrier()
-#define smp_wmb() barrier()
-#define smp_read_barrier_depends() do {} while(0)
-#define set_mb(var, value) \
- do { var = (value); barrier(); } while (0)
+#else
-extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2)));
-extern void free_initmem(void);
+extern uint32_t __xchg_32(uint32_t i, volatile void *v);
+
+#define xchg(ptr, x) \
+({ \
+ __typeof__(ptr) __xg_ptr = (ptr); \
+ __typeof__(*(ptr)) __xg_orig; \
+ \
+ switch (sizeof(__xg_orig)) { \
+ case 4: __xg_orig = (__typeof__(*(ptr))) __xchg_32((uint32_t) x, __xg_ptr); break; \
+ default: \
+ __xg_orig = (__typeof__(__xg_orig))0; \
+ asm volatile("break"); \
+ break; \
+ } \
+ __xg_orig; \
+})
+
+#endif
-#define arch_align_stack(x) (x)
+#define tas(ptr) (xchg((ptr), 1))
/*****************************************************************************/
/*
@@ -155,4 +169,4 @@ static inline unsigned long __cmpxchg_local(volatile void *ptr,
(unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-#endif /* _ASM_SYSTEM_H */
+#endif /* _ASM_CMPXCHG_H */
diff --git a/arch/frv/include/asm/exec.h b/arch/frv/include/asm/exec.h
new file mode 100644
index 00000000000..65c91305d4a
--- /dev/null
+++ b/arch/frv/include/asm/exec.h
@@ -0,0 +1,17 @@
+/* FR-V CPU executable handling
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_EXEC_H
+#define _ASM_EXEC_H
+
+#define arch_align_stack(x) (x)
+
+#endif /* _ASM_EXEC_H */
diff --git a/arch/frv/include/asm/switch_to.h b/arch/frv/include/asm/switch_to.h
new file mode 100644
index 00000000000..2cf0f6a7fbb
--- /dev/null
+++ b/arch/frv/include/asm/switch_to.h
@@ -0,0 +1,35 @@
+/* FR-V CPU basic task switching
+ *
+ * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _ASM_SWITCH_TO_H
+#define _ASM_SWITCH_TO_H
+
+#include <linux/thread_info.h>
+
+/*
+ * switch_to(prev, next) should switch from task `prev' to `next'
+ * `prev' will never be the same as `next'.
+ * The `mb' is to tell GCC not to cache `current' across this call.
+ */
+extern asmlinkage
+struct task_struct *__switch_to(struct thread_struct *prev_thread,
+ struct thread_struct *next_thread,
+ struct task_struct *prev);
+
+#define switch_to(prev, next, last) \
+do { \
+ (prev)->thread.sched_lr = \
+ (unsigned long) __builtin_return_address(0); \
+ (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
+ mb(); \
+} while(0)
+
+#endif /* _ASM_SWITCH_TO_H */
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