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38 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/kern_subr.c,v 1.31.2.2 2002/04/21 08:09:37 bde Exp $
40 * $DragonFly: src/sys/kern/kern_subr.c,v 1.10 2003/08/03 12:29:05 hmp Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
49 #include <sys/malloc.h>
51 #include <sys/resourcevar.h>
52 #include <sys/vnode.h>
55 #include <vm/vm_page.h>
56 #include <vm/vm_map.h>
68 int baseticks = ticks;
70 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
72 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
76 save = curproc->p_flag & P_DEADLKTREAT;
77 curproc->p_flag |= P_DEADLKTREAT;
80 while (n > 0 && uio->uio_resid) {
91 switch (uio->uio_segflg) {
95 if (ticks - baseticks >= hogticks) {
99 if (uio->uio_rw == UIO_READ)
100 error = copyout(cp, iov->iov_base, cnt);
102 error = copyin(iov->iov_base, cp, cnt);
108 if (uio->uio_rw == UIO_READ)
109 bcopy((caddr_t)cp, iov->iov_base, cnt);
111 bcopy(iov->iov_base, (caddr_t)cp, cnt);
116 iov->iov_base += cnt;
118 uio->uio_resid -= cnt;
119 uio->uio_offset += cnt;
124 curproc->p_flag = (curproc->p_flag & ~P_DEADLKTREAT) | save;
129 uiomoveco(cp, n, uio, obj)
133 struct vm_object *obj;
138 int baseticks = ticks;
140 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
141 ("uiomoveco: mode"));
142 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
145 while (n > 0 && uio->uio_resid) {
156 switch (uio->uio_segflg) {
160 if (ticks - baseticks >= hogticks) {
164 if (uio->uio_rw == UIO_READ) {
165 #ifdef ENABLE_VFS_IOOPT
166 if (vfs_ioopt && ((cnt & PAGE_MASK) == 0) &&
167 ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0) &&
168 ((uio->uio_offset & PAGE_MASK) == 0) &&
169 ((((intptr_t) cp) & PAGE_MASK) == 0)) {
170 error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
171 uio->uio_offset, cnt,
172 (vm_offset_t) iov->iov_base, NULL);
176 error = copyout(cp, iov->iov_base, cnt);
179 error = copyin(iov->iov_base, cp, cnt);
186 if (uio->uio_rw == UIO_READ)
187 bcopy((caddr_t)cp, iov->iov_base, cnt);
189 bcopy(iov->iov_base, (caddr_t)cp, cnt);
194 iov->iov_base += cnt;
196 uio->uio_resid -= cnt;
197 uio->uio_offset += cnt;
204 #ifdef ENABLE_VFS_IOOPT
207 uioread(n, uio, obj, nread)
210 struct vm_object *obj;
217 int baseticks = ticks;
225 while (n > 0 && uio->uio_resid) {
236 if ((uio->uio_segflg == UIO_USERSPACE) &&
237 ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0) &&
238 ((uio->uio_offset & PAGE_MASK) == 0) ) {
245 if (ticks - baseticks >= hogticks) {
249 error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
250 uio->uio_offset, cnt,
251 (vm_offset_t) iov->iov_base, &npagesmoved);
253 if (npagesmoved == 0)
256 tcnt = npagesmoved * PAGE_SIZE;
262 iov->iov_base += cnt;
264 uio->uio_resid -= cnt;
265 uio->uio_offset += cnt;
278 * Give next character to user as result of read.
288 if (uio->uio_iovcnt == 0 || uio->uio_resid == 0)
291 if (iov->iov_len == 0) {
296 switch (uio->uio_segflg) {
299 if (subyte(iov->iov_base, c) < 0)
308 if (suibyte(iov->iov_base, c) < 0)
321 #ifdef vax /* unused except by ct.c, other oddities XXX */
323 * Get next character written in by user from uio.
332 if (uio->uio_resid <= 0)
335 if (uio->uio_iovcnt <= 0)
338 if (iov->iov_len == 0) {
340 if (--uio->uio_iovcnt == 0)
344 switch (uio->uio_segflg) {
347 c = fubyte(iov->iov_base);
351 c = *(u_char *) iov->iov_base;
355 c = fuibyte(iov->iov_base);
369 * General routine to allocate a hash table.
372 hashinit(elements, type, hashmask)
374 struct malloc_type *type;
378 LIST_HEAD(generic, generic) *hashtbl;
382 panic("hashinit: bad elements");
383 for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
386 hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
387 for (i = 0; i < hashsize; i++)
388 LIST_INIT(&hashtbl[i]);
389 *hashmask = hashsize - 1;
393 static int primes[] = { 1, 13, 31, 61, 127, 251, 509, 761, 1021, 1531, 2039,
394 2557, 3067, 3583, 4093, 4603, 5119, 5623, 6143, 6653,
395 7159, 7673, 8191, 12281, 16381, 24571, 32749 };
396 #define NPRIMES (sizeof(primes) / sizeof(primes[0]))
399 * General routine to allocate a prime number sized hash table.
402 phashinit(elements, type, nentries)
404 struct malloc_type *type;
408 LIST_HEAD(generic, generic) *hashtbl;
412 panic("phashinit: bad elements");
413 for (i = 1, hashsize = primes[1]; hashsize <= elements;) {
417 hashsize = primes[i];
419 hashsize = primes[i - 1];
420 hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
421 for (i = 0; i < hashsize; i++)
422 LIST_INIT(&hashtbl[i]);
423 *nentries = hashsize;