uvm_page_array.h revision 1.1.2.5
1 1.1.2.3 yamt /* $NetBSD: uvm_page_array.h,v 1.1.2.5 2012/04/18 13:39:28 yamt Exp $ */ 2 1.1.2.1 yamt 3 1.1.2.1 yamt /*- 4 1.1.2.1 yamt * Copyright (c)2011 YAMAMOTO Takashi, 5 1.1.2.1 yamt * All rights reserved. 6 1.1.2.1 yamt * 7 1.1.2.1 yamt * Redistribution and use in source and binary forms, with or without 8 1.1.2.1 yamt * modification, are permitted provided that the following conditions 9 1.1.2.1 yamt * are met: 10 1.1.2.1 yamt * 1. Redistributions of source code must retain the above copyright 11 1.1.2.1 yamt * notice, this list of conditions and the following disclaimer. 12 1.1.2.1 yamt * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.1 yamt * notice, this list of conditions and the following disclaimer in the 14 1.1.2.1 yamt * documentation and/or other materials provided with the distribution. 15 1.1.2.1 yamt * 16 1.1.2.1 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.1.2.1 yamt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.1.2.1 yamt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.1.2.1 yamt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.1.2.1 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.1.2.1 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.1.2.1 yamt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.2.1 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.2.1 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.1 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.1 yamt * SUCH DAMAGE. 27 1.1.2.1 yamt */ 28 1.1.2.1 yamt 29 1.1.2.1 yamt #if !defined(_UVM_UVM_PAGE_ARRAY_H_) 30 1.1.2.1 yamt #define _UVM_UVM_PAGE_ARRAY_H_ 31 1.1.2.1 yamt 32 1.1.2.1 yamt /* 33 1.1.2.1 yamt * uvm_page_array: an array of pages. 34 1.1.2.1 yamt * 35 1.1.2.1 yamt * these structure and functions simply manipulate struct vm_page pointers. 36 1.1.2.1 yamt * it's caller's responsibity to acquire and keep the object lock so that 37 1.1.2.1 yamt * the result is valid. 38 1.1.2.1 yamt * 39 1.1.2.1 yamt * typical usage: 40 1.1.2.1 yamt * 41 1.1.2.5 yamt * struct uvm_page_array a; 42 1.1.2.1 yamt * 43 1.1.2.5 yamt * uvm_page_array_init(&a); 44 1.1.2.5 yamt * while ((pg = uvm_page_array_fill_and_peek(&a, uobj, off, ....)) 45 1.1.2.2 yamt * != NULL) { 46 1.1.2.3 yamt * off = pg->offset + PAGE_SIZE; 47 1.1.2.1 yamt * do_something(pg); 48 1.1.2.5 yamt * uvm_page_array_advance(&a); 49 1.1.2.1 yamt * } 50 1.1.2.5 yamt * uvm_page_array_fini(&a); 51 1.1.2.1 yamt */ 52 1.1.2.1 yamt 53 1.1.2.1 yamt struct vm_page; 54 1.1.2.1 yamt 55 1.1.2.1 yamt struct uvm_page_array { 56 1.1.2.1 yamt struct vm_page *ar_pages[16]; /* XXX tune */ 57 1.1.2.1 yamt unsigned int ar_npages; /* valid elements in ar_pages */ 58 1.1.2.1 yamt unsigned int ar_idx; /* index in ar_pages */ 59 1.1.2.1 yamt }; 60 1.1.2.1 yamt 61 1.1.2.1 yamt void uvm_page_array_init(struct uvm_page_array *); 62 1.1.2.1 yamt void uvm_page_array_fini(struct uvm_page_array *); 63 1.1.2.1 yamt void uvm_page_array_clear(struct uvm_page_array *); 64 1.1.2.1 yamt struct vm_page *uvm_page_array_peek(struct uvm_page_array *); 65 1.1.2.1 yamt void uvm_page_array_advance(struct uvm_page_array *); 66 1.1.2.1 yamt int uvm_page_array_fill(struct uvm_page_array *, struct uvm_object *, 67 1.1.2.4 yamt voff_t, unsigned int, unsigned int); 68 1.1.2.2 yamt struct vm_page *uvm_page_array_fill_and_peek(struct uvm_page_array *, 69 1.1.2.4 yamt struct uvm_object *, voff_t, unsigned int, unsigned int); 70 1.1.2.4 yamt 71 1.1.2.4 yamt /* 72 1.1.2.4 yamt * flags for uvm_page_array_fill and uvm_page_array_fill_and_peek 73 1.1.2.4 yamt */ 74 1.1.2.4 yamt #define UVM_PAGE_ARRAY_FILL_DIRTYONLY 1 /* skip known-clean pages */ 75 1.1.2.4 yamt #define UVM_PAGE_ARRAY_FILL_DENSE 2 /* stop on a hole */ 76 1.1.2.4 yamt #define UVM_PAGE_ARRAY_FILL_BACKWARD 4 /* descend order */ 77 1.1.2.1 yamt 78 1.1.2.1 yamt #endif /* defined(_UVM_UVM_ARRAY_H_) */ 79
Indexes created Sat Sep 20 22:09:52 GMT 2025