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#ifndef _M68K_SHM_H

#ifndef _M68K_SHM_H

#define _M68K_SHM_H

#define _M68K_SHM_H

/* format of page table entries that correspond to shared memory pages

/* format of page table entries that correspond to shared memory pages

   currently out in swap space (see also mm/swap.c):

   currently out in swap space (see also mm/swap.c):

   bits 0-1 (PAGE_PRESENT) is  = 0

   bits 0-1 (PAGE_PRESENT) is  = 0

   bits 8..2 (SWP_TYPE) are = SHM_SWP_TYPE

   bits 8..2 (SWP_TYPE) are = SHM_SWP_TYPE

   bits 31..9 are used like this:

   bits 31..9 are used like this:

   bits 15..9 (SHM_ID) the id of the shared memory segment

   bits 15..9 (SHM_ID) the id of the shared memory segment

   bits 30..16 (SHM_IDX) the index of the page within the shared memory segment

   bits 30..16 (SHM_IDX) the index of the page within the shared memory segment

                    (actually only bits 25..16 get used since SHMMAX is so low)

                    (actually only bits 25..16 get used since SHMMAX is so low)

   bit 31 (SHM_READ_ONLY) flag whether the page belongs to a read-only attach

   bit 31 (SHM_READ_ONLY) flag whether the page belongs to a read-only attach

*/

*/

/* on the m68k both bits 0 and 1 must be zero */

/* on the m68k both bits 0 and 1 must be zero */

#define SHM_ID_SHIFT    9

#define SHM_ID_SHIFT    9

#define _SHM_ID_BITS    7

#define _SHM_ID_BITS    7

#define SHM_ID_MASK     ((1<<_SHM_ID_BITS)-1)

#define SHM_ID_MASK     ((1<<_SHM_ID_BITS)-1)

#define SHM_IDX_SHIFT   (SHM_ID_SHIFT+_SHM_ID_BITS)

#define SHM_IDX_SHIFT   (SHM_ID_SHIFT+_SHM_ID_BITS)

#define _SHM_IDX_BITS   15

#define _SHM_IDX_BITS   15

#define SHM_IDX_MASK    ((1<<_SHM_IDX_BITS)-1)

#define SHM_IDX_MASK    ((1<<_SHM_IDX_BITS)-1)

#endif /* _M68K_SHM_H */

#endif /* _M68K_SHM_H */