mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 07:33:56 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
#ifndef _H8300_SHM_H
|
|
#define _H8300_SHM_H
|
|
|
|
#include <linux/config.h>
|
|
|
|
/* format of page table entries that correspond to shared memory pages
|
|
currently out in swap space (see also mm/swap.c):
|
|
bits 0-1 (PAGE_PRESENT) is = 0
|
|
bits 8..2 (SWP_TYPE) are = SHM_SWP_TYPE
|
|
bits 31..9 are used like this:
|
|
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
|
|
(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
|
|
*/
|
|
/* on the m68k both bits 0 and 1 must be zero */
|
|
/* format on the sun3 is similar, but bits 30, 31 are set to zero and all
|
|
others are reduced by 2. --m */
|
|
|
|
#ifndef CONFIG_SUN3
|
|
#define SHM_ID_SHIFT 9
|
|
#else
|
|
#define SHM_ID_SHIFT 7
|
|
#endif
|
|
#define _SHM_ID_BITS 7
|
|
#define SHM_ID_MASK ((1<<_SHM_ID_BITS)-1)
|
|
|
|
#define SHM_IDX_SHIFT (SHM_ID_SHIFT+_SHM_ID_BITS)
|
|
#define _SHM_IDX_BITS 15
|
|
#define SHM_IDX_MASK ((1<<_SHM_IDX_BITS)-1)
|
|
|
|
#endif /* _H8300_SHM_H */
|