2 * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu>
3 * Copyright (c) 1982, 1986, 1991, 1993
4 * The Regents of the University of California. All rights reserved.
5 * (c) UNIX System Laboratories, Inc.
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35 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/kernel.h>
44 #include <sys/mutex.h>
46 #include <sys/sf_buf.h>
47 #include <sys/systm.h>
51 #include <vm/vm_page.h>
52 #include <vm/vm_param.h>
54 #include <machine/cache.h>
55 #include <machine/tlb.h>
58 * Implement uiomove(9) from physical memory using a combination
59 * of the direct mapping and sf_bufs to reduce the creation and
60 * destruction of ephemeral mappings.
63 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
66 struct thread *td = curthread;
69 vm_offset_t page_offset;
76 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
77 ("uiomove_fromphys: mode"));
78 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
79 ("uiomove_fromphys proc"));
80 save = td->td_pflags & TDP_DEADLKTREAT;
81 td->td_pflags |= TDP_DEADLKTREAT;
82 while (n > 0 && uio->uio_resid) {
92 page_offset = offset & PAGE_MASK;
93 cnt = ulmin(cnt, PAGE_SIZE - page_offset);
94 m = ma[offset >> PAGE_SHIFT];
95 pa = VM_PAGE_TO_PHYS(m);
96 if (dcache_color_ignore == 0 &&
97 m->md.color != DCACHE_COLOR(pa)) {
98 sf = sf_buf_alloc(m, 0);
99 cp = (char *)sf_buf_kva(sf) + page_offset;
102 cp = (char *)TLB_PHYS_TO_DIRECT(pa) + page_offset;
104 switch (uio->uio_segflg) {
106 if (ticks - PCPU_GET(switchticks) >= hogticks)
108 if (uio->uio_rw == UIO_READ)
109 error = copyout(cp, iov->iov_base, cnt);
111 error = copyin(iov->iov_base, cp, cnt);
119 if (uio->uio_rw == UIO_READ)
120 bcopy(cp, iov->iov_base, cnt);
122 bcopy(iov->iov_base, cp, cnt);
129 iov->iov_base = (char *)iov->iov_base + cnt;
131 uio->uio_resid -= cnt;
132 uio->uio_offset += cnt;
138 td->td_pflags &= ~TDP_DEADLKTREAT;