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Use sf_bufs for uiomove_fromphys().

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This commit is contained in:
Olivier Houchard 2004-09-23 22:25:20 +00:00
parent 04aebdab36
commit 8476fd9ff7
1 changed files with 6 additions and 3 deletions
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9
sys/arm/arm/uio_machdep.c
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@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/sf_buf.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
@ -56,7 +57,7 @@ __FBSDID("$FreeBSD$");
#include <machine/vmparam.h>
/*
* Implement uiomove(9) from physical memory using the direct map to
* Implement uiomove(9) from physical memory using sf_bufs to
* avoid the creation and destruction of ephemeral mappings.
*/
int
@ -69,6 +70,7 @@ uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
size_t cnt;
int error = 0;
int save = 0;
struct sf_buf *sf;
KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
("uiomove_fromphys: mode"));
@ -88,8 +90,8 @@ uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
cnt = n;
page_offset = offset & PAGE_MASK;
cnt = min(cnt, PAGE_SIZE - page_offset);
cp = (char *)VM_PAGE_TO_PHYS(ma[offset >> PAGE_SHIFT]) +
page_offset;
sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0);
cp = (char*)sf_buf_kva(sf) + page_offset;
switch (uio->uio_segflg) {
case UIO_USERSPACE:
if (ticks - PCPU_GET(switchticks) >= hogticks)
@ -110,6 +112,7 @@ uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
case UIO_NOCOPY:
break;
}
sf_buf_free(sf);
iov->iov_base = (char *)iov->iov_base + cnt;
iov->iov_len -= cnt;
uio->uio_resid -= cnt;