1 files changed, 250 insertions, 0 deletions

diff --git a/include/asm-blackfin/system.h b/include/asm-blackfin/system.h
new file mode 100644
index 000000000000..758bac7c1e74
--- /dev/null
+++ b/include/asm-blackfin/system.h
@@ -0,0 +1,250 @@
+/*
+ * 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>
+
+/*
+ * Interrupt configuring macros.
+ */
+
+extern unsigned long irq_flags;
+
+#define local_irq_enable() do {         \
+        __asm__ __volatile__ (          \
+                "sti %0;"               \
+                ::"d"(irq_flags));      \
+} while (0)
+
+#define local_irq_disable() do {        \
+        int _tmp_dummy;                 \
+        __asm__ __volatile__ (          \
+                "cli %0;"               \
+                :"=d" (_tmp_dummy):);   \
+} while (0)
+
+#if defined(ANOMALY_05000244) && defined (CONFIG_BLKFIN_CACHE)
+#define idle_with_irq_disabled() do {   \
+        __asm__ __volatile__ (          \
+                "nop; nop;\n"           \
+                ".align 8;\n"           \
+                "sti %0; idle;\n"       \
+                ::"d" (irq_flags));     \
+} while (0)
+#else
+#define idle_with_irq_disabled() do {   \
+        __asm__ __volatile__ (          \
+                ".align 8;\n"           \
+                "sti %0; idle;\n"       \
+                ::"d" (irq_flags));     \
+} while (0)
+#endif
+
+#ifdef CONFIG_DEBUG_HWERR
+#define __save_and_cli(x) do {                  \
+        __asm__ __volatile__ (                  \
+                "cli %0;\n\tsti %1;"            \
+                :"=&d"(x): "d" (0x3F));         \
+} while (0)
+#else
+#define __save_and_cli(x) do {          \
+        __asm__ __volatile__ (          \
+                "cli %0;"               \
+                :"=&d"(x):);            \
+} while (0)
+#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_rmb(var, value)    do { (void) xchg(&var, value); } while (0)
+#define set_mb(var, value)     set_rmb(var, value)
+#define set_wmb(var, value)    do { var = value; wmb(); } 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))))
+#define tas(ptr) ((void)xchg((ptr),1))
+
+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;
+}
+
+/*
+ * 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.
+ */
+static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
+                                      unsigned long new, int size)
+{
+        unsigned long tmp = 0;
+        unsigned long flags = 0;
+
+        local_irq_save(flags);
+
+        switch (size) {
+        case 1:
+                __asm__ __volatile__
+                        ("%0 = b%3 (z);\n\t"
+                         "CC = %1 == %0;\n\t"
+                         "IF !CC JUMP 1f;\n\t"
+                         "b%3 = %2;\n\t"
+                         "1:\n\t"
+                         : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory");
+                break;
+        case 2:
+                __asm__ __volatile__
+                        ("%0 = w%3 (z);\n\t"
+                         "CC = %1 == %0;\n\t"
+                         "IF !CC JUMP 1f;\n\t"
+                         "w%3 = %2;\n\t"
+                         "1:\n\t"
+                         : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory");
+                break;
+        case 4:
+                __asm__ __volatile__
+                        ("%0 = %3;\n\t"
+                         "CC = %1 == %0;\n\t"
+                         "IF !CC JUMP 1f;\n\t"
+                         "%3 = %2;\n\t"
+                         "1:\n\t"
+                         : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory");
+                break;
+        }
+        local_irq_restore(flags);
+        return tmp;
+}
+
+#define cmpxchg(ptr,o,n)\
+        ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
+                                        (unsigned long)(n),sizeof(*(ptr))))
+
+#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 (&prev->thread_info->l1_task_info, L1_SCRATCH_TASK_INFO, \
+                sizeof *L1_SCRATCH_TASK_INFO); \
+        memcpy (L1_SCRATCH_TASK_INFO, &next->thread_info->l1_task_info, \
+                sizeof *L1_SCRATCH_TASK_INFO); \
+        (last) = resume (prev, next);   \
+} while (0)
+
+#endif                          /* _BLACKFIN_SYSTEM_H */