uvm_physseg.h revision 1.6
1 /* $NetBSD: uvm_physseg.h,v 1.6 2016/12/26 18:47:00 cherry Exp $ */ 2 3 /*- 4 * Copyright (c) 2016 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Cherry G. Mathew <cherry (at) NetBSD.org> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Consolidated API from uvm_page.c and others. 34 * Consolidated and designed by Cherry G. Mathew <cherry (at) NetBSD.org> 35 */ 36 37 #ifndef _UVM_UVM_PHYSSEG_H_ 38 #define _UVM_UVM_PHYSSEG_H_ 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_uvm_hotplug.h" 42 #endif 43 44 #include <sys/cdefs.h> 45 #include <sys/param.h> 46 #include <sys/types.h> 47 48 #ifdef _KERNEL 49 /* 50 * No APIs are explicitly #included in uvm_physseg.c 51 */ 52 53 #if defined(UVM_HOTPLUG) /* rbtree impementation */ 54 #define PRIxPHYSSEG "p" 55 56 /* 57 * These are specific values of invalid constants for uvm_physseg_t. 58 * uvm_physseg_valid_p() == false on any of the below constants. 59 * 60 * Specific invalid constants encapsulate specific explicit failure 61 * scenarios (see the comments next to them) 62 */ 63 64 #define UVM_PHYSSEG_TYPE_INVALID NULL /* Generic invalid value */ 65 #define UVM_PHYSSEG_TYPE_INVALID_EMPTY NULL /* empty segment access */ 66 #define UVM_PHYSSEG_TYPE_INVALID_OVERFLOW NULL /* ran off the end of the last segment */ 67 68 typedef struct uvm_physseg * uvm_physseg_t; 69 70 #else /* UVM_HOTPLUG */ 71 72 #define PRIxPHYSSEG "d" 73 74 /* 75 * These are specific values of invalid constants for uvm_physseg_t. 76 * uvm_physseg_valid_p() == false on any of the below constants. 77 * 78 * Specific invalid constants encapsulate specific explicit failure 79 * scenarios (see the comments next to them) 80 */ 81 82 #define UVM_PHYSSEG_TYPE_INVALID -1 /* Generic invalid value */ 83 #define UVM_PHYSSEG_TYPE_INVALID_EMPTY -1 /* empty segment access */ 84 #define UVM_PHYSSEG_TYPE_INVALID_OVERFLOW (uvm_physseg_get_last() + 1) /* ran off the end of the last segment */ 85 86 typedef int uvm_physseg_t; 87 #endif /* UVM_HOTPLUG */ 88 89 void uvm_physseg_init(void); 90 91 bool uvm_physseg_valid_p(uvm_physseg_t); 92 93 /* 94 * Return start/end pfn of given segment 95 * Returns: -1 if the segment number is invalid 96 */ 97 paddr_t uvm_physseg_get_start(uvm_physseg_t); 98 paddr_t uvm_physseg_get_end(uvm_physseg_t); 99 100 paddr_t uvm_physseg_get_avail_start(uvm_physseg_t); 101 paddr_t uvm_physseg_get_avail_end(uvm_physseg_t); 102 103 struct vm_page * uvm_physseg_get_pg(uvm_physseg_t, paddr_t); 104 105 #ifdef __HAVE_PMAP_PHYSSEG 106 struct pmap_physseg * uvm_physseg_get_pmseg(uvm_physseg_t); 107 #endif 108 109 int uvm_physseg_get_free_list(uvm_physseg_t); 110 u_int uvm_physseg_get_start_hint(uvm_physseg_t); 111 bool uvm_physseg_set_start_hint(uvm_physseg_t, u_int); 112 113 /* 114 * Functions to help walk the list of segments. 115 * Returns: NULL if the segment number is invalid 116 */ 117 uvm_physseg_t uvm_physseg_get_next(uvm_physseg_t); 118 uvm_physseg_t uvm_physseg_get_prev(uvm_physseg_t); 119 uvm_physseg_t uvm_physseg_get_first(void); 120 uvm_physseg_t uvm_physseg_get_last(void); 121 122 123 /* Return the frame number of the highest registered physical page frame */ 124 paddr_t uvm_physseg_get_highest_frame(void); 125 126 /* Actually, uvm_page_physload takes PF#s which need their own type */ 127 uvm_physseg_t uvm_page_physload(paddr_t, paddr_t, paddr_t, 128 paddr_t, int); 129 130 bool uvm_page_physunload(uvm_physseg_t, int, paddr_t *); 131 bool uvm_page_physunload_force(uvm_physseg_t, int, paddr_t *); 132 133 uvm_physseg_t uvm_physseg_find(paddr_t, psize_t *); 134 135 bool uvm_physseg_plug(paddr_t, size_t, uvm_physseg_t *); 136 bool uvm_physseg_unplug(paddr_t, size_t); 137 138 #if defined(PMAP_STEAL_MEMORY) 139 /* 140 * XXX: Legacy: This needs to be upgraded to a full pa management 141 * layer. 142 */ 143 void uvm_physseg_set_avail_start(uvm_physseg_t, paddr_t); 144 void uvm_physseg_set_avail_end(uvm_physseg_t, paddr_t); 145 #endif /* PMAP_STEAL_MEMORY */ 146 147 #endif /* _KERNEL */ 148 149 #endif /* _UVM_UVM_PHYSSEG_H_ */ 150
Indexes created Thu Sep 25 16:09:42 GMT 2025