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system.h

#ifndef _M68KNOMMU_SYSTEM_H
#define _M68KNOMMU_SYSTEM_H

#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 outputs */                              \
      :                                         \
      : "cc", "%d0", "memory")
/* For spinlocks etc */
#define local_irq_save(x) __asm__ __volatile__ (            \
      "movew %%sr,%0\n\t"                             \
      "movew #0x0700,%%d0\n\t"                        \
      "or.l  %0,%%d0\n\t"                             \
      "movew %%d0,%/sr"                         \
      : "=d" (x)                                \
      :                                         \
      : "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 */
#ifndef local_irq_save
#define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } while (0)
#endif

#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_mb(var, value)    ({ (var) = (value); wmb(); })

#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 read_barrier_depends()  ((void)0)

#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))

#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

#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

#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_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_M5272)
/*
 * Retrieve the boot address in flash using CSBR0 and CSOR0
 * find the reset vector at flash_address + 4 (e.g. 0x400)
 * remap it in the flash's current location (e.g. 0xf0000400)
 * and jump there.
 */ 
#define HARD_RESET_NOW() ({         \
      asm("                   \
      movew #0x2700, %%sr;          \
      move.l      %0+0x40,%%d0;           \
      and.l %0+0x44,%%d0;           \
      andi.l      #0xfffff000,%%d0; \
      mov.l %%d0,%%a0;        \
      or.l  4(%%a0),%%d0;           \
      mov.l %%d0,%%a0;        \
      jmp (%%a0);"                  \
      : /* No output */       \
      : "o" (*(char *)MCF_MBAR) );  \
})
#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 char *)(MCF_IPSBAR + 0x110000));      \
      while(1)                      \
      *reset |= (0x01 << 7);\
})
#elif defined(CONFIG_M523x)
#define HARD_RESET_NOW() ({         \
      asm("                   \
      movew #0x2700, %sr;           \
      movel #0x01000000, %sp;       \
      moveal #0x40110000, %a0;      \
      moveb #0x80, (%a0);           \
      ");                     \
})
#elif defined(CONFIG_M520x)
      /*
       * The MCF5208 has a bit (SOFTRST) in memory (Reset Control Register 
       * RCR), that when set, resets the MCF5208.
       */
#define HARD_RESET_NOW()            \
({                            \
      unsigned char volatile *reset;      \
      asm("move.w     #0x2700, %sr");     \
      reset = ((volatile unsigned char *)(MCF_IPSBAR + 0xA0000)); \
      while(1)                \
            *reset |= 0x80;         \
})
#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)


static inline int irqs_disabled_flags(unsigned long flags)
{
      if (flags & 0x0700)
            return 0;
      else
            return 1;
}

#endif /* _M68KNOMMU_SYSTEM_H */

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