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#ifndef _M68K_SEGMENT_H

#define _M68K_SEGMENT_H

/* define constants */

/* Address spaces (FC0-FC2) */

#define USER_DATA     (1)

#ifndef USER_DS

#define USER_DS       (USER_DATA)

#endif

#define USER_PROGRAM  (2)

#define SUPER_DATA    (5)

#ifndef KERNEL_DS

#define KERNEL_DS     (SUPER_DATA)

#endif

#define SUPER_PROGRAM (6)

#define CPU_SPACE     (7)

#ifndef __ASSEMBLY__

/*

 * Uh, these should become the main single-value transfer routines..

 * They automatically use the right size if we just have the right

 * pointer type..

 */

#define put_user(x,ptr) __put_user((unsigned long)(x),(ptr),sizeof(*(ptr)))

#define get_user(ptr) ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr))))

/*

 * This is a silly but good way to make sure that

 * the __put_user function is indeed always optimized,

 * and that we use the correct sizes..

 */

extern int bad_user_access_length(void);

#define __ptr(x) ((unsigned long *)(x))

static inline void __put_user(unsigned long x, void * y, int size)

{

        switch (size) {

                case 1:

                        __asm__ ("movesb %0,%1"

                                : /* no outputs */

                                :"r" (x),"m" (*__ptr(y)) : "memory");

                        break;

                case 2:

                        __asm__ ("movesw %0,%1"

                                : /* no outputs */

                                :"r" (x),"m" (*__ptr(y)) : "memory");

                        break;

                case 4:

                        __asm__ ("movesl %0,%1"

                                : /* no outputs */

                                :"r" (x),"m" (*__ptr(y)) : "memory");

                        break;

                default:

                        bad_user_access_length();

        }

}

static inline unsigned long __get_user(const void * y, int size)

{

        unsigned long result;

        switch (size) {

                case 1:

                        __asm__ ("movesb %1,%0"

                                 :"=r" (result)

                                 :"m" (*__ptr(y)));

                        return (unsigned char) result;

                case 2:

                        __asm__ ("movesw %1,%0"

                                 :"=r" (result)

                                 :"m" (*__ptr(y)));

                        return (unsigned short) result;

                case 4:

                        __asm__ ("movesl %1,%0"

                                 :"=r" (result)

                                 :"m" (*__ptr(y)));

                        return result;

                default:

                        return bad_user_access_length();

        }

}

#undef __ptr

/*

 * These are deprecated..

 *

 * Use "put_user()" and "get_user()" with the proper pointer types instead.

 */

#define get_fs_byte(addr) __get_user((const unsigned char *)(addr),1)

#define get_fs_word(addr) __get_user((const unsigned short *)(addr),2)

#define get_fs_long(addr) __get_user((const unsigned int *)(addr),4)

#define put_fs_byte(x,addr) __put_user((x),(unsigned char *)(addr),1)

#define put_fs_word(x,addr) __put_user((x),(unsigned short *)(addr),2)

#define put_fs_long(x,addr) __put_user((x),(unsigned int *)(addr),4)

#ifdef WE_REALLY_WANT_TO_USE_A_BROKEN_INTERFACE

static inline unsigned char get_user_byte(const char * addr)

{

        return __get_user(addr,1);

}

static inline unsigned short get_user_word(const short *addr)

{

        return __get_user(addr,2);

}

static inline unsigned long get_user_long(const int *addr)

{

        return __get_user(addr,4);

}

static inline void put_user_byte(char val,char *addr)

{

        __put_user(val, addr, 1);

}

static inline void put_user_word(short val,short * addr)

{

        __put_user(val, addr, 2);

}

static inline void put_user_long(unsigned long val,int * addr)

{

        __put_user(val, addr, 4);

}

#endif

static inline void __generic_memcpy_tofs(void * to, const void * from, unsigned long n)

{

        unsigned long tmp;

        if (n == 0) return;

        tmp = n;

        n >>= 2;

        if (n != 0)

                __asm__ ("1:\t"

                         "movel %1@+,%/d0\n\t"

                         "movesl %/d0,%2@+\n\t"

                              "dbra %0,1b\n\t"

                              "clrw %0\n\t"

                              "subql #1,%0\n\t"

                         "bccs 1b\n\t"

                              : "=d" (n), "=a" (from), "=a" (to)

                         : "0" (n-1), "1" (from), "2" (to)

                         : "d0", "memory");

        if (tmp & 2)

                __asm__ ("movew %0@+,%/d0\n\t"

                         "movesw %/d0,%1@+\n\t"

                         : "=a" (from), "=a" (to)

                         : "0" (from), "1" (to)

                         : "d0", "memory");

        if (tmp & 1)

                __asm__ __volatile__ ("moveb %0@,%/d0\n\t"

                         "movesb %/d0,%1@\n\t"

                         : /* no outputs */

                         : "a" (from), "a" (to)

                              : "d0", "memory");

}

static inline void __constant_memcpy_tofs(void * to, const void * from, unsigned long n)

{

        switch (n) {

                case 0:

                        return;

                case 1:

                        __put_user(*(const char *) from, (char *) to, 1);

                        return;

                case 2:

                        __put_user(*(const short *) from, (short *) to, 2);

                        return;

                case 3:

                        __put_user(*(const short *) from, (short *) to, 2);

                        __put_user(*(2+(const char *) from), 2+(char *) to, 1);

                        return;

                case 4:

                        __put_user(*(const int *) from, (int *) to, 4);

                        return;

                case 8:

                        __put_user(*(const int *) from, (int *) to, 4);

                        __put_user(*(1+(const int *) from), 1+(int *) to, 4);

                        return;

                case 12:

                        __put_user(*(const int *) from, (int *) to, 4);

                        __put_user(*(1+(const int *) from), 1+(int *) to, 4);

                        __put_user(*(2+(const int *) from), 2+(int *) to, 4);

                        return;

                case 16:

                        __put_user(*(const int *) from, (int *) to, 4);

                        __put_user(*(1+(const int *) from), 1+(int *) to, 4);

                        __put_user(*(2+(const int *) from), 2+(int *) to, 4);

                        __put_user(*(3+(const int *) from), 3+(int *) to, 4);

                        return;

        }

#define COMMON(x)                     \

__asm__ __volatile__ ("1:\n\t"        \

            "movel %1@+,%/d0\n\t"     \

            "movesl %/d0,%2@+\n\t"    \

            "dbra %0,1b\n\t"          \

            "clrw %0\n\t"             \

            "subql #1,%0\n\t"         \

            "bccs 1b\n\t"             \

            x                     \

            : "=d" (n), "=a" (from), "=a" (to)    \

            : "1" (from), "2" (to), "0" (n/4-1)   \

            : "d0", "memory");

  switch (n % 4) {

      case 0:

          COMMON("");

          return;

      case 1:

          COMMON("moveb %1@+,%/d0; movesb %/d0,%2@+");

          return;

      case 2:

          COMMON("movew %1@+,%/d0; movesw %/d0,%2@+");

          return;

      case 3:

          COMMON("movew %1@+,%/d0; movesw %/d0,%2@+\n\t"

                 "moveb %1@+,%/d0; movesb %/d0,%2@+");

          return;

  }

#undef COMMON

}

static inline void __generic_memcpy_fromfs(void * to, const void * from, unsigned long n)

{

        unsigned long tmp;

        if (n == 0) return;

        tmp = n;

        n >>= 2;

        if (n != 0)

                __asm__ ("1:\t"

                         "movesl %1@+,%/d0\n\t"

                         "movel %/d0,%2@+\n\t"

                              "dbra %0,1b\n\t"

                              "clrw %0\n\t"

                              "subql #1,%0\n\t"

                         "bccs 1b\n\t"

                              : "=d" (n), "=a" (from), "=a" (to)

                         : "0" (n-1), "1" (from), "2" (to)

                         : "d0", "memory");

        if (tmp & 2)

                __asm__ ("movesw %0@+,%/d0\n\t"

                         "movew %/d0,%1@+\n\t"

                         : "=a" (from), "=a" (to)

                         : "0" (from), "1" (to)

                         : "d0", "memory");

        if (tmp & 1)

                __asm__ __volatile__ ("movesb %0@,%/d0\n\t"

                         "moveb %/d0,%1@\n\t"

                         : /* no outputs */

                         : "a" (from), "a" (to)

                              : "d0", "memory");

}

static inline void __constant_memcpy_fromfs(void * to, const void * from, unsigned long n)

{

        switch (n) {

                case 0:

                        return;

                case 1:

                        *(char *)to = __get_user((const char *) from, 1);

                        return;

                case 2:

                        *(short *)to = __get_user((const short *) from, 2);

                        return;

                case 3:

                        *(short *) to = __get_user((const short *) from, 2);

                        *((char *) to + 2) = __get_user(2+(const char *) from, 1);

                        return;

                case 4:

                        *(int *) to = __get_user((const int *) from, 4);

                        return;

                case 8:

                        *(int *) to = __get_user((const int *) from, 4);

                        *(1+(int *) to) = __get_user(1+(const int *) from, 4);

                        return;

                case 12:

                        *(int *) to = __get_user((const int *) from, 4);

                        *(1+(int *) to) = __get_user(1+(const int *) from, 4);

                        *(2+(int *) to) = __get_user(2+(const int *) from, 4);

                        return;

                case 16:

                        *(int *) to = __get_user((const int *) from, 4);

                        *(1+(int *) to) = __get_user(1+(const int *) from, 4);

                        *(2+(int *) to) = __get_user(2+(const int *) from, 4);

                        *(3+(int *) to) = __get_user(3+(const int *) from, 4);

                        return;

        }

#define COMMON(x)                     \

__asm__ __volatile__ ("1:\n\t"        \

            "movesl %1@+,%/d0\n\t"    \

            "movel %/d0,%2@+\n\t"     \

            "dbra %0,1b\n\t"          \

            "clrw %0\n\t"             \

            "subql #1,%0\n\t"         \

            "bccs 1b\n\t"             \

            x                         \

            : "=d" (n), "=a" (from), "=a" (to)    \

            : "1" (from), "2" (to), "0" (n/4-1)   \

            : "d0", "memory");

  switch (n % 4) {

      case 0:

          COMMON("");

          return;

      case 1:

          COMMON("movesb %1@+,%/d0; moveb %/d0,%2@+");

          return;

      case 2:

          COMMON("movesw %1@+,%/d0; movew %/d0,%2@+");

          return;

      case 3:

          COMMON("movesw %1@+,%/d0; movew %/d0,%2@+\n\t"

                 "movesb %1@+,%/d0; moveb %/d0,%2@+");

          return;

  }

#undef COMMON

}

#define memcpy_fromfs(to, from, n) \

(__builtin_constant_p(n) ? \

 __constant_memcpy_fromfs((to),(from),(n)) : \

 __generic_memcpy_fromfs((to),(from),(n)))

#define memcpy_tofs(to, from, n) \

(__builtin_constant_p(n) ? \

 __constant_memcpy_tofs((to),(from),(n)) : \

 __generic_memcpy_tofs((to),(from),(n)))

/*

 * Get/set the SFC/DFC registers for MOVES instructions

 */

static inline unsigned long get_fs(void)

{

        unsigned long _v;

        __asm__ ("movec %/dfc,%0":"=r" (_v):);

        return _v;

}

static inline unsigned long get_ds(void)

{

    /* return the supervisor data space code */

    return KERNEL_DS;

}

static inline void set_fs(unsigned long val)

{

        __asm__ __volatile__ ("movec %0,%/sfc\n\t"

                              "movec %0,%/dfc\n\t"

                              : /* no outputs */ : "r" (val) : "memory");

}

#endif /* __ASSEMBLY__ */

#endif /* _M68K_SEGMENT_H */