1 files changed, 221 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h
new file mode 100644
index 000000000000..8f1627d8bf09
--- /dev/null
+++ b/arch/blackfin/include/asm/system.h
@@ -0,0 +1,221 @@
+/*
+ * File:        include/asm/system.h
+ * Based on:
+ * Author:      Tony Kou (tonyko@lineo.ca)
+ *              Copyright (c) 2002 Arcturus Networks Inc.
+ *                    (www.arcturusnetworks.com)
+ *              Copyright (c) 2003 Metrowerks (www.metrowerks.com)
+ *              Copyright (c) 2004 Analog Device Inc.
+ * Created:     25Jan2001 - Tony Kou
+ * Description: system.h include file
+ *
+ * Modified:     22Sep2006 - Robin Getz
+ *                - move include blackfin.h down, so I can get access to
+ *                   irq functions in other include files.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.
+ * If not, write to the Free Software Foundation,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _BLACKFIN_SYSTEM_H
+#define _BLACKFIN_SYSTEM_H
+
+#include <linux/linkage.h>
+#include <linux/compiler.h>
+#include <mach/anomaly.h>
+
+/*
+ * Interrupt configuring macros.
+ */
+
+extern unsigned long irq_flags;
+
+#define local_irq_enable() \
+        __asm__ __volatile__( \
+                "sti %0;" \
+                : \
+                : "d" (irq_flags) \
+        )
+
+#define local_irq_disable() \
+        do { \
+                int __tmp_dummy; \
+                __asm__ __volatile__( \
+                        "cli %0;" \
+                        : "=d" (__tmp_dummy) \
+                ); \
+        } while (0)
+
+#if ANOMALY_05000244 && defined(CONFIG_BFIN_ICACHE)
+# define NOP_PAD_ANOMALY_05000244 "nop; nop;"
+#else
+# define NOP_PAD_ANOMALY_05000244
+#endif
+
+#define idle_with_irq_disabled() \
+        __asm__ __volatile__( \
+                NOP_PAD_ANOMALY_05000244 \
+                ".align 8;" \
+                "sti %0;" \
+                "idle;" \
+                : \
+                : "d" (irq_flags) \
+        )
+
+#ifdef CONFIG_DEBUG_HWERR
+# define __save_and_cli(x) \
+        __asm__ __volatile__( \
+                "cli %0;" \
+                "sti %1;" \
+                : "=&d" (x) \
+                : "d" (0x3F) \
+        )
+#else
+# define __save_and_cli(x) \
+        __asm__ __volatile__( \
+                "cli %0;" \
+                : "=&d" (x) \
+        )
+#endif
+
+#define local_save_flags(x) \
+        __asm__ __volatile__( \
+                "cli %0;" \
+                "sti %0;" \
+                : "=d" (x) \
+        )
+
+#ifdef CONFIG_DEBUG_HWERR
+#define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0)
+#else
+#define irqs_enabled_from_flags(x) ((x) != 0x1f)
+#endif
+
+#define local_irq_restore(x) \
+        do { \
+                if (irqs_enabled_from_flags(x)) \
+                        local_irq_enable(); \
+        } while (0)
+
+/* For spinlocks etc */
+#define local_irq_save(x) __save_and_cli(x)
+
+#define irqs_disabled()                         \
+({                                              \
+        unsigned long flags;                    \
+        local_save_flags(flags);                \
+        !irqs_enabled_from_flags(flags);        \
+})
+
+/*
+ * Force strict CPU ordering.
+ */
+#define nop()  asm volatile ("nop;\n\t"::)
+#define mb()   asm volatile (""   : : :"memory")
+#define rmb()  asm volatile (""   : : :"memory")
+#define wmb()  asm volatile (""   : : :"memory")
+#define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
+
+#define read_barrier_depends()          do { } while(0)
+
+#ifdef CONFIG_SMP
+#define smp_mb()        mb()
+#define smp_rmb()       rmb()
+#define smp_wmb()       wmb()
+#define smp_read_barrier_depends()      read_barrier_depends()
+#else
+#define smp_mb()        barrier()
+#define smp_rmb()       barrier()
+#define smp_wmb()       barrier()
+#define smp_read_barrier_depends()      do { } while(0)
+#endif
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+struct __xchg_dummy {
+        unsigned long a[100];
+};
+#define __xg(x) ((volatile struct __xchg_dummy *)(x))
+
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+                                   int size)
+{
+        unsigned long tmp = 0;
+        unsigned long flags = 0;
+
+        local_irq_save(flags);
+
+        switch (size) {
+        case 1:
+                __asm__ __volatile__
+                        ("%0 = b%2 (z);\n\t"
+                         "b%2 = %1;\n\t"
+                         : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+                break;
+        case 2:
+                __asm__ __volatile__
+                        ("%0 = w%2 (z);\n\t"
+                         "w%2 = %1;\n\t"
+                         : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+                break;
+        case 4:
+                __asm__ __volatile__
+                        ("%0 = %2;\n\t"
+                         "%2 = %1;\n\t"
+                         : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+                break;
+        }
+        local_irq_restore(flags);
+        return tmp;
+}
+
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * 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))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#ifndef CONFIG_SMP
+#include <asm-generic/cmpxchg.h>
+#endif
+
+#define prepare_to_switch()     do { } while(0)
+
+/*
+ * switch_to(n) should switch tasks to task ptr, first checking that
+ * ptr isn't the current task, in which case it does nothing.
+ */
+
+#include <asm/blackfin.h>
+
+asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next);
+
+#define switch_to(prev,next,last) \
+do {    \
+        memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \
+                sizeof *L1_SCRATCH_TASK_INFO); \
+        memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \
+                sizeof *L1_SCRATCH_TASK_INFO); \
+        (last) = resume (prev, next);   \
+} while (0)
+
+#endif                          /* _BLACKFIN_SYSTEM_H */