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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 1.7 2003/07/21 07:57:47 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
47 #include <sys/malloc.h>
49 #include <sys/resourcevar.h>
50 #include <sys/vnode.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_map.h>
60 register struct uio *uio;
62 register struct iovec *iov;
66 int baseticks = ticks;
68 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
70 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
74 save = curproc->p_flag & P_DEADLKTREAT;
75 curproc->p_flag |= P_DEADLKTREAT;
78 while (n > 0 && uio->uio_resid) {
89 switch (uio->uio_segflg) {
93 if (ticks - baseticks >= hogticks) {
97 if (uio->uio_rw == UIO_READ)
98 error = copyout(cp, iov->iov_base, cnt);
100 error = copyin(iov->iov_base, cp, cnt);
106 if (uio->uio_rw == UIO_READ)
107 bcopy((caddr_t)cp, iov->iov_base, cnt);
109 bcopy(iov->iov_base, (caddr_t)cp, cnt);
114 iov->iov_base += cnt;
116 uio->uio_resid -= cnt;
117 uio->uio_offset += cnt;
122 curproc->p_flag = (curproc->p_flag & ~P_DEADLKTREAT) | save;
127 uiomoveco(cp, n, uio, obj)
131 struct vm_object *obj;
136 int baseticks = ticks;
138 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
139 ("uiomoveco: mode"));
140 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
143 while (n > 0 && uio->uio_resid) {
154 switch (uio->uio_segflg) {
158 if (ticks - baseticks >= hogticks) {
162 if (uio->uio_rw == UIO_READ) {
163 #ifdef ENABLE_VFS_IOOPT
164 if (vfs_ioopt && ((cnt & PAGE_MASK) == 0) &&
165 ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0) &&
166 ((uio->uio_offset & PAGE_MASK) == 0) &&
167 ((((intptr_t) cp) & PAGE_MASK) == 0)) {
168 error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
169 uio->uio_offset, cnt,
170 (vm_offset_t) iov->iov_base, NULL);
174 error = copyout(cp, iov->iov_base, cnt);
177 error = copyin(iov->iov_base, cp, cnt);
184 if (uio->uio_rw == UIO_READ)
185 bcopy((caddr_t)cp, iov->iov_base, cnt);
187 bcopy(iov->iov_base, (caddr_t)cp, cnt);
192 iov->iov_base += cnt;
194 uio->uio_resid -= cnt;
195 uio->uio_offset += cnt;
202 #ifdef ENABLE_VFS_IOOPT
205 uioread(n, uio, obj, nread)
208 struct vm_object *obj;
215 int baseticks = ticks;
223 while (n > 0 && uio->uio_resid) {
234 if ((uio->uio_segflg == UIO_USERSPACE) &&
235 ((((intptr_t) iov->iov_base) & PAGE_MASK) == 0) &&
236 ((uio->uio_offset & PAGE_MASK) == 0) ) {
243 if (ticks - baseticks >= hogticks) {
247 error = vm_uiomove(&curproc->p_vmspace->vm_map, obj,
248 uio->uio_offset, cnt,
249 (vm_offset_t) iov->iov_base, &npagesmoved);
251 if (npagesmoved == 0)
254 tcnt = npagesmoved * PAGE_SIZE;
260 iov->iov_base += cnt;
262 uio->uio_resid -= cnt;
263 uio->uio_offset += cnt;
276 * Give next character to user as result of read.
281 register struct uio *uio;
283 register struct iovec *iov;
286 if (uio->uio_iovcnt == 0 || uio->uio_resid == 0)
289 if (iov->iov_len == 0) {
294 switch (uio->uio_segflg) {
297 if (subyte(iov->iov_base, c) < 0)
306 if (suibyte(iov->iov_base, c) < 0)
319 #ifdef vax /* unused except by ct.c, other oddities XXX */
321 * Get next character written in by user from uio.
327 register struct iovec *iov;
330 if (uio->uio_resid <= 0)
333 if (uio->uio_iovcnt <= 0)
336 if (iov->iov_len == 0) {
338 if (--uio->uio_iovcnt == 0)
342 switch (uio->uio_segflg) {
345 c = fubyte(iov->iov_base);
349 c = *(u_char *) iov->iov_base;
353 c = fuibyte(iov->iov_base);
367 * General routine to allocate a hash table.
370 hashinit(elements, type, hashmask)
372 struct malloc_type *type;
376 LIST_HEAD(generic, generic) *hashtbl;
380 panic("hashinit: bad elements");
381 for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
384 hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
385 for (i = 0; i < hashsize; i++)
386 LIST_INIT(&hashtbl[i]);
387 *hashmask = hashsize - 1;
391 static int primes[] = { 1, 13, 31, 61, 127, 251, 509, 761, 1021, 1531, 2039,
392 2557, 3067, 3583, 4093, 4603, 5119, 5623, 6143, 6653,
393 7159, 7673, 8191, 12281, 16381, 24571, 32749 };
394 #define NPRIMES (sizeof(primes) / sizeof(primes[0]))
397 * General routine to allocate a prime number sized hash table.
400 phashinit(elements, type, nentries)
402 struct malloc_type *type;
406 LIST_HEAD(generic, generic) *hashtbl;
410 panic("phashinit: bad elements");
411 for (i = 1, hashsize = primes[1]; hashsize <= elements;) {
415 hashsize = primes[i];
417 hashsize = primes[i - 1];
418 hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
419 for (i = 0; i < hashsize; i++)
420 LIST_INIT(&hashtbl[i]);
421 *nentries = hashsize;