/* $Id: shmparam.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $ */
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/* $Id: shmparam.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $ */
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#ifndef _ASMSPARC_SHMPARAM_H
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#ifndef _ASMSPARC_SHMPARAM_H
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#define _ASMSPARC_SHMPARAM_H
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#define _ASMSPARC_SHMPARAM_H
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/* address range for shared memory attaches if no address passed to shmat() */
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/* address range for shared memory attaches if no address passed to shmat() */
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#define SHM_RANGE_START 0x10000000
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#define SHM_RANGE_START 0x10000000
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#define SHM_RANGE_END 0x20000000
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#define SHM_RANGE_END 0x20000000
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/*
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/*
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* Format of a swap-entry for shared memory pages currently out in
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* Format of a swap-entry for shared memory pages currently out in
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* swap space (see also mm/swap.c).
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* swap space (see also mm/swap.c).
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*
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*
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* SWP_TYPE = SHM_SWP_TYPE
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* SWP_TYPE = SHM_SWP_TYPE
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* SWP_OFFSET is used as follows:
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* SWP_OFFSET is used as follows:
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*
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*
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* bits 0..6 : id of shared memory segment page belongs to (SHM_ID)
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* bits 0..6 : id of shared memory segment page belongs to (SHM_ID)
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* bits 7..21: index of page within shared memory segment (SHM_IDX)
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* bits 7..21: index of page within shared memory segment (SHM_IDX)
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* (actually fewer bits get used since SHMMAX is so low)
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* (actually fewer bits get used since SHMMAX is so low)
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*/
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*/
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/*
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/*
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* Keep _SHM_ID_BITS as low as possible since SHMMNI depends on it and
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* Keep _SHM_ID_BITS as low as possible since SHMMNI depends on it and
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* there is a static array of size SHMMNI.
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* there is a static array of size SHMMNI.
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*/
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*/
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#define _SHM_ID_BITS 7
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#define _SHM_ID_BITS 7
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#define SHM_ID_MASK ((1<<_SHM_ID_BITS)-1)
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#define SHM_ID_MASK ((1<<_SHM_ID_BITS)-1)
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#define SHM_IDX_SHIFT (_SHM_ID_BITS)
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#define SHM_IDX_SHIFT (_SHM_ID_BITS)
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#define _SHM_IDX_BITS 15
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#define _SHM_IDX_BITS 15
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#define SHM_IDX_MASK ((1<<_SHM_IDX_BITS)-1)
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#define SHM_IDX_MASK ((1<<_SHM_IDX_BITS)-1)
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/*
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/*
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* _SHM_ID_BITS + _SHM_IDX_BITS must be <= 24 on the i386 and
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* _SHM_ID_BITS + _SHM_IDX_BITS must be <= 24 on the i386 and
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* SHMMAX <= (PAGE_SIZE << _SHM_IDX_BITS).
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* SHMMAX <= (PAGE_SIZE << _SHM_IDX_BITS).
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*/
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*/
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#define SHMMAX (1024 * 1024) /* max shared seg size (bytes) */
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#define SHMMAX (1024 * 1024) /* max shared seg size (bytes) */
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#define SHMMIN 1 /* really PAGE_SIZE */ /* min shared seg size (bytes) */
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#define SHMMIN 1 /* really PAGE_SIZE */ /* min shared seg size (bytes) */
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#define SHMMNI (1<<_SHM_ID_BITS) /* max num of segs system wide */
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#define SHMMNI (1<<_SHM_ID_BITS) /* max num of segs system wide */
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#define SHMALL /* max shm system wide (pages) */ \
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#define SHMALL /* max shm system wide (pages) */ \
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(1<<(_SHM_IDX_BITS+_SHM_ID_BITS))
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(1<<(_SHM_IDX_BITS+_SHM_ID_BITS))
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#define SHMLBA PAGE_SIZE /* attach addr a multiple of this */
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#define SHMLBA PAGE_SIZE /* attach addr a multiple of this */
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#define SHMSEG SHMMNI /* max shared segs per process */
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#define SHMSEG SHMMNI /* max shared segs per process */
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#endif /* _ASMSPARC_SHMPARAM_H */
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#endif /* _ASMSPARC_SHMPARAM_H */
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