projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 6bafdb92 C |
1 | /* cmap.h 4.5 81/03/09 */ |
| 2 | ||
| 3 | /* | |
| 4 | * core map entry | |
| 5 | */ | |
| 6 | struct cmap | |
| 7 | { | |
| 8 | unsigned int c_next:13, /* index of next free list entry */ | |
| 9 | c_prev:13, /* index of previous free list entry */ | |
| 10 | c_mdev:4, /* which mounted dev this is from */ | |
| 11 | c_lock:1, /* locked for raw i/o or pagein */ | |
| 12 | c_want:1, /* wanted */ | |
| 13 | c_page:16, /* virtual page number in segment */ | |
| 14 | c_hlink:13, /* hash link for <blkno,mdev> */ | |
| 15 | c_intrans:1, /* intransit bit */ | |
| 16 | c_free:1, /* on the free list */ | |
| 17 | c_gone:1, /* associated page has been released */ | |
| 18 | c_type:2, /* type CSYS or CTEXT or CSTACK or CDATA */ | |
| 19 | c_blkno:20, /* disk block this is a copy of */ | |
| 20 | c_ndx:10; /* index of owner proc or text */ | |
| 21 | }; | |
| 22 | ||
| 23 | #define CMHEAD 0 | |
| 24 | ||
| 25 | /* | |
| 26 | * Shared text pages are not totally abandoned when a process | |
| 27 | * exits, but are remembered while in the free list hashed by <mdev,blkno> | |
| 28 | * off the cmhash structure so that they can be reattached | |
| 29 | * if another instance of the program runs again soon. | |
| 30 | */ | |
| 31 | #define CMHSIZ 512 /* SHOULD BE DYNAMIC */ | |
| 32 | #define CMHASH(bn) ((bn)&(CMHSIZ-1)) | |
| 33 | ||
| 34 | #ifdef KERNEL | |
| 35 | struct cmap *cmap; | |
| 36 | struct cmap *ecmap; | |
| 37 | int ncmap; | |
| 38 | struct cmap *mfind(); | |
| 39 | int firstfree, maxfree; | |
| 40 | int ecmx; /* cmap index of ecmap */ | |
| 41 | short cmhash[CMHSIZ]; | |
| 42 | #endif | |
| 43 | ||
| 44 | /* bits defined in c_type */ | |
| 45 | ||
| 46 | #define CSYS 0 /* none of below */ | |
| 47 | #define CTEXT 1 /* belongs to shared text segment */ | |
| 48 | #define CDATA 2 /* belongs to data segment */ | |
| 49 | #define CSTACK 3 /* belongs to stack segment */ | |
| 50 | ||
| 51 | #define pgtocm(x) ((((x)-firstfree) / CLSIZE) + 1) | |
| 52 | #define cmtopg(x) ((((x)-1) * CLSIZE) + firstfree) |