src/sys/kern/kern_xio.c - diff

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Diff for /src/sys/kern/kern_xio.c between versions 1.4 and 1.5

version 1.4, 2004/04/03 08:20:10	version 1.5, 2004/05/13 17:40:15
Line 65	Line 65
* Initialize an XIO given a userspace buffer. 0 is returned on success,	* Initialize an XIO given a userspace buffer. 0 is returned on success,
* an error code on failure. The actual number of bytes that could be	* an error code on failure. The actual number of bytes that could be
* accomodated in the XIO will be stored in xio_bytes.	* accomodated in the XIO will be stored in xio_bytes.
	*
	* Note that you cannot legally accessed a previously cached linmap with
	* a newly initialized xio until after calling xio_linmap().
*/	*/
int	int
xio_init_ubuf(xio_t xio, void *ubase, size_t ubytes, int flags)	xio_init_ubuf(xio_t xio, void *ubase, size_t ubytes, int flags)
Line 74 xio_init_ubuf(xio_t xio, void *ubase, si	Line 77 xio_init_ubuf(xio_t xio, void *ubase, si
vm_page_t m;	vm_page_t m;
int i;	int i;
int n;	int n;
	int s;
int vmprot;	int vmprot;

addr = trunc_page((vm_offset_t)ubase);	addr = trunc_page((vm_offset_t)ubase);
Line 94 xio_init_ubuf(xio_t xio, void *ubase, si	Line 98 xio_init_ubuf(xio_t xio, void *ubase, si
break;	break;
if ((paddr = pmap_kextract(addr)) == 0)	if ((paddr = pmap_kextract(addr)) == 0)
break;	break;
	s = splvm();
m = PHYS_TO_VM_PAGE(paddr);	m = PHYS_TO_VM_PAGE(paddr);
vm_page_hold(m);	vm_page_hold(m);
	splx(s);
xio->xio_pages[i] = m;	xio->xio_pages[i] = m;
ubytes -= n;	ubytes -= n;
xio->xio_bytes += n;	xio->xio_bytes += n;
Line 123 xio_init_ubuf(xio_t xio, void *ubase, si	Line 129 xio_init_ubuf(xio_t xio, void *ubase, si
* accomodated in the XIO will be stored in xio_bytes.	* accomodated in the XIO will be stored in xio_bytes.
*	*
* vmprot is usually either VM_PROT_READ or VM_PROT_WRITE.	* vmprot is usually either VM_PROT_READ or VM_PROT_WRITE.
	*
	* Note that you cannot legally accessed a previously cached linmap with
	* a newly initialized xio until after calling xio_linmap().
*/	*/
int	int
xio_init_kbuf(xio_t xio, void *kbase, size_t kbytes)	xio_init_kbuf(xio_t xio, void *kbase, size_t kbytes)
Line 132 xio_init_kbuf(xio_t xio, void *kbase, si	Line 141 xio_init_kbuf(xio_t xio, void *kbase, si
vm_page_t m;	vm_page_t m;
int i;	int i;
int n;	int n;
	int s;

addr = trunc_page((vm_offset_t)kbase);	addr = trunc_page((vm_offset_t)kbase);
xio->xio_flags = 0;	xio->xio_flags = 0;
Line 144 xio_init_kbuf(xio_t xio, void *kbase, si	Line 154 xio_init_kbuf(xio_t xio, void *kbase, si
for (i = 0; n && i < XIO_INTERNAL_PAGES; ++i) {	for (i = 0; n && i < XIO_INTERNAL_PAGES; ++i) {
if ((paddr = pmap_kextract(addr)) == 0)	if ((paddr = pmap_kextract(addr)) == 0)
break;	break;
	s = splvm();
m = PHYS_TO_VM_PAGE(paddr);	m = PHYS_TO_VM_PAGE(paddr);
vm_page_hold(m);	vm_page_hold(m);
	splx(s);
xio->xio_pages[i] = m;	xio->xio_pages[i] = m;
kbytes -= n;	kbytes -= n;
xio->xio_bytes += n;	xio->xio_bytes += n;
Line 166 xio_init_kbuf(xio_t xio, void *kbase, si	Line 178 xio_init_kbuf(xio_t xio, void *kbase, si
return(xio->xio_error);	return(xio->xio_error);
}	}

	/*
	* Cleanup an XIO so it can be destroyed. The pages associated with the
	* XIO are released. If a linear mapping buffer is active, it will be
	* unlocked but the mappings will be left intact for optimal reconstitution
	* in a later xio_linmap() call.
	*
	* Note that you cannot legally accessed the linmap on a released XIO.
	*/
void	void
xio_release(xio_t xio)	xio_release(xio_t xio)
{	{
int i;	int i;
	int s;
vm_page_t m;	vm_page_t m;

	s = splvm();
for (i = 0; i < xio->xio_npages; ++i) {	for (i = 0; i < xio->xio_npages; ++i) {
m = xio->xio_pages[i];	m = xio->xio_pages[i];
vm_page_unhold(m);	vm_page_unhold(m);
}	}
	splx(s);
	if (xio->xio_flags & XIOF_LINMAP) {
	xio->xio_flags &= ~XIOF_LINMAP;
	/* XXX */
	}
xio->xio_offset = 0;	xio->xio_offset = 0;
xio->xio_npages = 0;	xio->xio_npages = 0;
xio->xio_bytes = 0;	xio->xio_bytes = 0;

Removed from v.1.4
changed lines
	Added in v.1.5