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Annotation of coherent/d/PS2_KERNEL/include/sys/buf.h, revision 1.1.1.1

1.1       root        1: /* (-lgl
                      2:  *     COHERENT Version 4.0
                      3:  *     Copyright (c) 1982, 1992 by Mark Williams Company.
                      4:  *     All rights reserved. May not be copied without permission.
                      5:  -lgl) */
                      6: /*
                      7:  * Buffer header.
                      8:  */
                      9: #ifndef  BUF_H
                     10: #define  BUF_H
                     11: 
                     12: #include <sys/types.h>
                     13: 
                     14: typedef struct buf {
                     15:        struct   buf *b_actf;           /* First in queue */
                     16:        struct   buf *b_actl;           /* Last in queue */
                     17:        GATE     b_gate;                /* Gate */
                     18:        unsigned b_flag;                /* Flags */
                     19:        dev_t    b_dev;                 /* Device */
                     20:        daddr_t  b_bno;                 /* Block number */
                     21:        char     b_req;                 /* I/O type */
                     22:        char     b_err;                 /* Error */
                     23:        unsigned b_seqn;                /* Buffer sequence number */
                     24:        bold_t   b_map;                 /* Old map */
                     25: #ifndef _I386
                     26:        vaddr_t  b_count;               /* Size of I/O */
                     27:        vaddr_t  b_resid;               /* Driver returns count here */
                     28:        faddr_t  b_faddr;               /* Far Virtual address */
                     29:        paddr_t  b_paddr;               /* Physical address */
                     30: #else
                     31:        off_t    b_count;               /* Size of I/O */
                     32:        off_t    b_resid;               /* Driver returns count here */
                     33:        paddr_t  b_paddr;               /*      physical  address (bytes) */
                     34:        vaddr_t  b_vaddr;               /* kernel virtual address (bytes) */
                     35:        unsigned long b_hashval;        /* used to index into hasharray[] */
                     36:        struct   buf *b_LRUf;           /* Next (older) in LRU chain */
                     37:        struct   buf *b_LRUb;           /* Previous (newer) in LRU chain */
                     38:        struct   buf *b_hashf;          /* Next in this hash chain */
                     39:        struct   buf *b_hashb;          /* Previous in this hash chain */
                     40: #endif /* _I386 */
                     41: } BUF;
                     42: 
                     43: /*
                     44:  * Flags (b_flags).
                     45:  */
                     46: #define BFNTP  0x0001                  /* Buffer not valid */
                     47: #define BFREQ  0x0002                  /* Buffer requested */
                     48: #define BFERR  0x0004                  /* Error */
                     49: #define BFMOD  0x0008                  /* Data has been modified */
                     50: #define BFASY  0x0010                  /* Asynchrous */
                     51: #define BFMAP  0x0020                  /* Buffer has been mapped */
                     52: #define BFRAW  0x0040                  /* Request is raw */
                     53: #define BFTAP  0x0080                  /* Request is to a tape */
                     54: 
                     55: #define BFBLK  0x4000                  /* Aligned on a block boundary */
                     56: #define BFIOC  0x8000                  /* Perform bounds checking */
                     57: 
                     58: /*
                     59:  * Requests.
                     60:  */
                     61: #define        BREAD   1                       /* Read */
                     62: #define BWRITE 2                       /* Write */
                     63: 
                     64: #define        BNULL   ((BUF *)0)
                     65: 
                     66: #ifdef KERNEL
                     67: /*
                     68:  * Functions.
                     69:  */
                     70: extern BUF      *bread();              /* bio.c */
                     71: extern BUF      *bclaim();             /* bio.c */
                     72: extern BUF      *vread();              /* fs3.c */
                     73: extern BUF      *aread();              /* fs3.c */
                     74: extern daddr_t  vmap();                /* fs3.c */
                     75: extern int      *lmap();               /* fs3.c */
                     76: 
                     77: /*
                     78:  * Global variables.
                     79:  */
                     80: extern unsigned bufseqn;               /* Buffer sequencer */
                     81: extern int      bufneed;               /* Buffer is needed */
                     82: extern BUF      swapbuf;               /* Buffer for swap I/O */
                     83: extern BUF      *bufl;                 /* Buffer headers */
                     84: #endif /* KERNEL */
                     85: 
                     86: #endif /* BUF_H */

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