1 files changed, 286 insertions, 0 deletions

diff --git a/include/asm-m68knommu/system.h b/include/asm-m68knommu/system.h
new file mode 100644
index 000000000000..c341b66c147b
--- /dev/null
+++ b/include/asm-m68knommu/system.h
@@ -0,0 +1,286 @@
+#ifndef _M68KNOMMU_SYSTEM_H
+#define _M68KNOMMU_SYSTEM_H
+
+#include <linux/config.h> /* get configuration macros */
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/entry.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, offset of tss in d1, and whether
+ * the mm structures are shared in d2 (to avoid atc flushing).
+ */
+asmlinkage void resume(void);
+#define switch_to(prev,next,last)                               \
+{                                                               \
+  void *_last;                                                  \
+  __asm__ __volatile__(                                         \
+        "movel  %1, %%a0\n\t"                                   \
+        "movel  %2, %%a1\n\t"                                   \
+        "jbsr resume\n\t"                                       \
+        "movel  %%d1, %0\n\t"                                   \
+       : "=d" (_last)                                           \
+       : "d" (prev), "d" (next)                                 \
+       : "cc", "d0", "d1", "d2", "d3", "d4", "d5", "a0", "a1"); \
+  (last) = _last;                                               \
+}
+
+#ifdef CONFIG_COLDFIRE
+#define local_irq_enable() __asm__ __volatile__ (               \
+        "move %/sr,%%d0\n\t"                                    \
+        "andi.l #0xf8ff,%%d0\n\t"                               \
+        "move %%d0,%/sr\n"                                      \
+        : /* no outputs */                                      \
+        :                                                       \
+        : "cc", "%d0", "memory")
+#define local_irq_disable() __asm__ __volatile__ (              \
+        "move %/sr,%%d0\n\t"                                    \
+        "ori.l  #0x0700,%%d0\n\t"                               \
+        "move %%d0,%/sr\n"                                      \
+        : /* no inputs */                                       \
+        :                                                       \
+        : "cc", "%d0", "memory")
+#else
+
+/* portable version */ /* FIXME - see entry.h*/
+#define ALLOWINT 0xf8ff
+
+#define local_irq_enable() asm volatile ("andiw %0,%%sr": : "i" (ALLOWINT) : "memory")
+#define local_irq_disable() asm volatile ("oriw  #0x0700,%%sr": : : "memory")
+#endif
+
+#define local_save_flags(x) asm volatile ("movew %%sr,%0":"=d" (x) : : "memory")
+#define local_irq_restore(x) asm volatile ("movew %0,%%sr": :"d" (x) : "memory")
+
+/* For spinlocks etc */
+#define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } while (0)
+
+#define irqs_disabled()                 \
+({                                      \
+        unsigned long flags;            \
+        local_save_flags(flags);        \
+        ((flags & 0x0700) == 0x0700);   \
+})
+
+#define iret() __asm__ __volatile__ ("rte": : :"memory", "sp", "cc")
+
+/*
+ * Force strict CPU ordering.
+ * Not really required on m68k...
+ */
+#define nop()  asm volatile ("nop"::)
+#define mb()   asm volatile (""   : : :"memory")
+#define rmb()  asm volatile (""   : : :"memory")
+#define wmb()  asm volatile (""   : : :"memory")
+#define set_rmb(var, value)    do { 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)
+
+#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) (xchg((ptr),1))
+
+struct __xchg_dummy { unsigned long a[100]; };
+#define __xg(x) ((volatile struct __xchg_dummy *)(x))
+
+#ifndef CONFIG_RMW_INSNS
+static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
+{
+  unsigned long tmp, flags;
+
+  local_irq_save(flags);
+
+  switch (size) {
+  case 1:
+    __asm__ __volatile__
+    ("moveb %2,%0\n\t"
+     "moveb %1,%2"
+    : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+    break;
+  case 2:
+    __asm__ __volatile__
+    ("movew %2,%0\n\t"
+     "movew %1,%2"
+    : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+    break;
+  case 4:
+    __asm__ __volatile__
+    ("movel %2,%0\n\t"
+     "movel %1,%2"
+    : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+    break;
+  }
+  local_irq_restore(flags);
+  return tmp;
+}
+#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;
+        }
+        return x;
+}
+#endif
+
+/*
+ * 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.
+ */
+#define __HAVE_ARCH_CMPXCHG     1
+
+static __inline__ unsigned long
+cmpxchg(volatile int *p, int old, int new)
+{
+        unsigned long flags;
+        int prev;
+
+        local_irq_save(flags);
+        if ((prev = *p) == old)
+                *p = new;
+        local_irq_restore(flags);
+        return(prev);
+}
+
+
+#ifdef CONFIG_M68332
+#define HARD_RESET_NOW() ({             \
+        local_irq_disable();            \
+        asm("                           \
+        movew   #0x0000, 0xfffa6a;      \
+        reset;                          \
+        /*movew #0x1557, 0xfffa44;*/    \
+        /*movew #0x0155, 0xfffa46;*/    \
+        moveal #0, %a0;                 \
+        movec %a0, %vbr;                \
+        moveal 0, %sp;                  \
+        moveal 4, %a0;                  \
+        jmp (%a0);                      \
+        ");                             \
+})
+#endif
+
+#if defined( CONFIG_M68328 ) || defined( CONFIG_M68EZ328 ) || \
+        defined (CONFIG_M68360) || defined( CONFIG_M68VZ328 )
+#define HARD_RESET_NOW() ({             \
+        local_irq_disable();            \
+        asm("                           \
+        moveal #0x10c00000, %a0;        \
+        moveb #0, 0xFFFFF300;           \
+        moveal 0(%a0), %sp;             \
+        moveal 4(%a0), %a0;             \
+        jmp (%a0);                      \
+        ");                             \
+})
+#endif
+
+#ifdef CONFIG_COLDFIRE
+#if defined(CONFIG_M5272) && defined(CONFIG_NETtel)
+/*
+ *      Need to account for broken early mask of 5272 silicon. So don't
+ *      jump through the original start address. Jump strait into the
+ *      known start of the FLASH code.
+ */
+#define HARD_RESET_NOW() ({             \
+        asm("                           \
+        movew #0x2700, %sr;             \
+        jmp 0xf0000400;                 \
+        ");                             \
+})
+#elif defined(CONFIG_NETtel) || defined(CONFIG_eLIA) || defined(CONFIG_DISKtel) || defined(CONFIG_SECUREEDGEMP3) || defined(CONFIG_CLEOPATRA)
+#define HARD_RESET_NOW() ({             \
+        asm("                           \
+        movew #0x2700, %sr;             \
+        moveal #0x10000044, %a0;        \
+        movel #0xffffffff, (%a0);       \
+        moveal #0x10000001, %a0;        \
+        moveb #0x00, (%a0);             \
+        moveal #0xf0000004, %a0;        \
+        moveal (%a0), %a0;              \
+        jmp (%a0);                      \
+        ");                             \
+})
+#elif defined(CONFIG_M528x)
+/*
+ * The MCF528x has a bit (SOFTRST) in memory (Reset Control Register RCR),
+ * that when set, resets the MCF528x.
+ */
+#define HARD_RESET_NOW() \
+({                                              \
+        unsigned char volatile *reset;          \
+        asm("move.w     #0x2700, %sr");         \
+        reset = ((volatile unsigned short *)(MCF_IPSBAR + 0x110000));   \
+        while(1)                                \
+        *reset |= (0x01 << 7);\
+})
+#else
+#define HARD_RESET_NOW() ({             \
+        asm("                           \
+        movew #0x2700, %sr;             \
+        moveal #0x4, %a0;               \
+        moveal (%a0), %a0;              \
+        jmp (%a0);                      \
+        ");                             \
+})
+#endif
+#endif
+#define arch_align_stack(x) (x)
+
+#endif /* _M68KNOMMU_SYSTEM_H */