1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
33  * a scatter/gather list of physical address ranges.
86 	 * The scatter/gather list must only include page-aligned  in sg_pager_alloc()
91 	for (i = 0; i < sg->sg_nseg; i++) {  in sg_pager_alloc()
92 		if ((sg->sg_segs[i].ss_paddr % PAGE_SIZE) != 0 ||  in sg_pager_alloc()
93 		    (sg->sg_segs[i].ss_len % PAGE_SIZE) != 0)  in sg_pager_alloc()
95 		npages += sg->sg_segs[i].ss_len / PAGE_SIZE;  in sg_pager_alloc()
99 	 * The scatter/gather list has a fixed size.  Refuse requests  in sg_pager_alloc()
110 	 * scatter/gather list.  It is ok for our purposes to have  in sg_pager_alloc()
111 	 * multiple VM objects associated with the same scatter/gather  in sg_pager_alloc()
112 	 * list because scatter/gather lists are static.  This is also  in sg_pager_alloc()
113 	 * simpler than ensuring a unique object per scatter/gather  in sg_pager_alloc()
117 	object->handle = sglist_hold(sg);  in sg_pager_alloc()
118 	TAILQ_INIT(&object->un_pager.sgp.sgp_pglist);  in sg_pager_alloc()
131 	while ((m = TAILQ_FIRST(&object->un_pager.sgp.sgp_pglist)) != 0) {  in sg_pager_dealloc()
134 		TAILQ_REMOVE(&object->un_pager.sgp.sgp_pglist, m, plinks.q);  in sg_pager_dealloc()
138 	sg = object->handle;  in sg_pager_dealloc()
140 	object->handle = NULL;  in sg_pager_dealloc()
141 	object->type = OBJT_DEAD;  in sg_pager_dealloc()
159 	sg = object->handle;  in sg_pager_getpages()
160 	memattr = object->memattr;  in sg_pager_getpages()
161 	offset = m[0]->pindex;  in sg_pager_getpages()
166 	 * page is found since '0' can be a valid page-aligned physical  in sg_pager_getpages()
171 	for (i = 0; i < sg->sg_nseg; i++) {  in sg_pager_getpages()
172 		if (space + sg->sg_segs[i].ss_len <= (offset * PAGE_SIZE)) {  in sg_pager_getpages()
173 			space += sg->sg_segs[i].ss_len;  in sg_pager_getpages()
176 		paddr = sg->sg_segs[i].ss_paddr + offset * PAGE_SIZE - space;  in sg_pager_getpages()
190 	KASSERT(!(m[0]->flags & PG_FICTITIOUS),  in sg_pager_getpages()
196 	TAILQ_INSERT_TAIL(&object->un_pager.sgp.sgp_pglist, page, plinks.q);  in sg_pager_getpages()