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1.1 root 1: /* @(#)shm.h 6.1 */
2: /*
3: ** IPC Shared Memory Facility.
4: */
5:
6: /*
7: ** Implementation Constants.
8: */
9:
10: #define SHMLBA NBPG /* segment low boundary address multiple */
11: #define P0MASK 0xc0000000 /* P0 address mask */
12:
13: /*
14: ** Permission Definitions.
15: */
16:
17: #define SHM_R 0x0100 /* read permission */
18: #define SHM_W 0x0080 /* write permission */
19:
20: /*
21: ** ipc_perm Mode Definitions.
22: */
23:
24: #define SHM_CLEAR 0x0200 /* clear segment on next attach */
25: #define SHM_DEST 0x0400 /* destroy segment when # attached = 0 */
26:
27: /*
28: ** Message Operation Flags.
29: */
30:
31: #define SHM_RDONLY 0x1000 /* attach read-only (else read-write) */
32: #define SHM_RND 0x2000 /* round attach address to SHMLBA */
33:
34: /*
35: * Defines for shared memory limits
36: */
37:
38: #define SHMMAX (128*NBPG) /* max. shared memory segment size */
39: #define SHMMIN 1 /* min. shared memory segment size */
40: #define SHMMNI 100 /* max. no. shared memory identifers */
41: #define SHMSEG 6 /* max. attached shared memory segs per proc */
42: #define SHMBRK 16 /* gap (clicks) between data and shared mem */
43: #define SHMALL 1024 /* max shared memory clicks system wide */
44:
45: /*
46: * Defines for swapping
47: */
48:
49: #define DMSHM 1024 /* page segment size for disk addresses */
50: #define NSHMDAD 12 /* number of shared memory disk addresses */
51: #define SHM_SWAP 0x010 /* shared memory segment swapped out */
52: #define SHM_UNLINK 0x020 /* proc unlinked from shared memory segment */
53:
54:
55: /*
56: ** Structure Definitions.
57: */
58:
59: /*
60: ** There is a shmem data structure for each segment in the system.
61: */
62:
63: struct shmid_ds {
64: struct ipc_perm shm_perm; /* operation permission struct */
65: int shm_segsz; /* segment size */
66: struct proc *shm_proc; /* ptr to linked proc, if loaded */
67: short shm_pidx; /* shm_pt index of that proc */
68: u_short shm_lpid; /* pid of last shmop */
69: u_short shm_cpid; /* pid of creator */
70: u_short shm_cnattch; /* # attached in memory */
71: u_short shm_nattch; /* current # attached */
72: time_t shm_atime; /* last shmat time */
73: time_t shm_dtime; /* last shmdt time */
74: time_t shm_ctime; /* last change time */
75: swblk_t shm_daddr[NSHMDAD]; /* disk add. of DMSHM pages */
76: swblk_t shm_ptdaddr; /* disk add. of page tables */
77: short shm_rssize; /* resident size */
78: short shm_poip; /* page out in progress count */
79: u_char shm_status; /* status - e.g. swapped out */
80: };
81:
82: struct shminfo {
83: int shmmax, /* max shared memory segment size */
84: shmmin, /* min shared memory segment size */
85: shmmni, /* # of shared memory identifiers */
86: shmseg, /* max attached shared memory segments per process */
87: shmbrk, /* gap (in clicks) between data and shared memory */
88: shmall; /* max total shared memory system wide (in clicks) */
89: };
90:
91: struct shm_pt {
92: u_int shm_sva; /* starting virtual page address */
93: struct shmid_ds *shm_shmp; /* ptr to associated shmem */
94: struct proc *shm_link; /* next proc sharing this segment */
95: short shm_idx; /* shm_pt index of that proc */
96: struct pte *shm_spte; /* starting pte entry */
97: struct pte *shm_epte; /* ending pte entry */
98: int shm_sflg; /* status flag */
99: };
100: struct shm_pt *vtoshmpt();
101:
102: #ifdef KERNEL
103: struct shmid_ds *shmem, *shmemNSHMEM;
104: int dmshm, nshmem;
105: #endif KERNEL
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