2 * Written by Julian Elischer (julian@tfs.com)
3 * for TRW Financial Systems for use under the MACH(2.5) operating system.
5 * TRW Financial Systems, in accordance with their agreement with Carnegie
6 * Mellon University, makes this software available to CMU to distribute
7 * or use in any manner that they see fit as long as this message is kept with
8 * the software. For this reason TFS also grants any other persons or
9 * organisations permission to use or modify this software.
11 * TFS supplies this software to be publicly redistributed
12 * on the understanding that TFS is not responsible for the correct
13 * functioning of this software in any circumstances.
15 * $FreeBSD: src/sys/cam/cam_extend.c,v 1.3 1999/08/28 00:40:39 peter Exp $
18 * XXX XXX XXX XXX We should get DEVFS working so that we
19 * don't have to do this, possibly sparse, array based junk.
20 * XXX: We can do this now with dev_t, that's even better.
23 * Extensible arrays: Use a realloc like implementation to permit
24 * the arrays to be extend.
26 #include <sys/param.h>
27 #include <sys/systm.h>
28 #include <sys/kernel.h>
29 #include <sys/malloc.h>
31 #include <cam/cam_extend.h>
40 cam_extend_alloc(size_t s)
42 void *p = malloc(s, M_DEVBUF, M_NOWAIT);
44 panic("extend_alloc: malloc failed.");
49 cam_extend_free(void *p)
54 /* EXTEND_CHUNK: Number of extend slots to allocate whenever we need a new
58 #define EXTEND_CHUNK 8
64 struct extend_array *p = cam_extend_alloc(sizeof(*p));
74 cam_extend_set(struct extend_array *ea, int index, void *value)
76 if (index >= ea->nelem) {
78 space = cam_extend_alloc(sizeof(void *) * (index + EXTEND_CHUNK));
79 bzero(space, sizeof(void *) * (index + EXTEND_CHUNK));
81 /* Make sure we have something to copy before we copy it */
83 bcopy(ea->ps, space, sizeof(void *) * ea->nelem);
84 cam_extend_free(ea->ps);
88 ea->nelem = index + EXTEND_CHUNK;
91 printf("extend_set: entry %d already has storage.\n", index);
95 ea->ps[index] = value;
101 cam_extend_get(struct extend_array *ea,
104 if (ea == NULL || index >= ea->nelem || index < 0)
106 return ea->ps[index];
110 cam_extend_release(struct extend_array *ea, int index)
112 void *p = cam_extend_get(ea, index);