1 /* $NetBSD: uvm_physseg.h,v 1.9 2024/01/13 09:44:42 tnn 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 /* 49 * No APIs are explicitly #included in uvm_physseg.c 50 */ 51 52 #if defined(UVM_HOTPLUG) /* rbtree impementation */ 53 #define PRIxPHYSSEG "p" 54 55 /* 56 * These are specific values of invalid constants for uvm_physseg_t. 57 * uvm_physseg_valid_p() == false on any of the below constants. 58 * 59 * Specific invalid constants encapsulate specific explicit failure 60 * scenarios (see the comments next to them) 61 */ 62 63 #define UVM_PHYSSEG_TYPE_INVALID NULL /* Generic invalid value */ 64 #define UVM_PHYSSEG_TYPE_INVALID_EMPTY NULL /* empty segment access */ 65 #define UVM_PHYSSEG_TYPE_INVALID_OVERFLOW NULL /* ran off the end of the last segment */ 66 67 typedef struct uvm_physseg * uvm_physseg_t; 68 69 #else /* UVM_HOTPLUG */ 70 71 #define PRIxPHYSSEG "d" 72 73 /* 74 * These are specific values of invalid constants for uvm_physseg_t. 75 * uvm_physseg_valid_p() == false on any of the below constants. 76 * 77 * Specific invalid constants encapsulate specific explicit failure 78 * scenarios (see the comments next to them) 79 */ 80 81 #define UVM_PHYSSEG_TYPE_INVALID -1 /* Generic invalid value */ 82 #define UVM_PHYSSEG_TYPE_INVALID_EMPTY -1 /* empty segment access */ 83 #define UVM_PHYSSEG_TYPE_INVALID_OVERFLOW (uvm_physseg_get_last() + 1) /* ran off the end of the last segment */ 84 85 typedef int uvm_physseg_t; 86 #endif /* UVM_HOTPLUG */ 87 88 void uvm_physseg_init(void); 89 90 bool uvm_physseg_valid_p(uvm_physseg_t); 91 92 /* 93 * Return start/end pfn of given segment 94 * Returns: -1 if the segment number is invalid 95 */ 96 paddr_t uvm_physseg_get_start(uvm_physseg_t); 97 paddr_t uvm_physseg_get_end(uvm_physseg_t); 98 99 paddr_t uvm_physseg_get_avail_start(uvm_physseg_t); 100 paddr_t uvm_physseg_get_avail_end(uvm_physseg_t); 101 102 struct vm_page * uvm_physseg_get_pg(uvm_physseg_t, paddr_t); 103 104 #ifdef __HAVE_PMAP_PHYSSEG 105 struct pmap_physseg * uvm_physseg_get_pmseg(uvm_physseg_t); 106 #endif 107 108 int uvm_physseg_get_free_list(uvm_physseg_t); 109 u_long uvm_physseg_get_start_hint(uvm_physseg_t); 110 bool uvm_physseg_set_start_hint(uvm_physseg_t, u_long); 111 112 /* 113 * Functions to help walk the list of segments. 114 * Returns: NULL if the segment number is invalid 115 */ 116 uvm_physseg_t uvm_physseg_get_next(uvm_physseg_t); 117 uvm_physseg_t uvm_physseg_get_prev(uvm_physseg_t); 118 uvm_physseg_t uvm_physseg_get_first(void); 119 uvm_physseg_t uvm_physseg_get_last(void); 120 121 122 /* Return the frame number of the highest registered physical page frame */ 123 paddr_t uvm_physseg_get_highest_frame(void); 124 125 /* Actually, uvm_page_physload takes PF#s which need their own type */ 126 uvm_physseg_t uvm_page_physload(paddr_t, paddr_t, paddr_t, 127 paddr_t, int); 128 129 bool uvm_page_physunload(uvm_physseg_t, int, paddr_t *); 130 bool uvm_page_physunload_force(uvm_physseg_t, int, paddr_t *); 131 132 uvm_physseg_t uvm_physseg_find(paddr_t, psize_t *); 133 134 bool uvm_physseg_plug(paddr_t, size_t, uvm_physseg_t *); 135 bool uvm_physseg_unplug(paddr_t, size_t); 136 137 #if defined(UVM_PHYSSEG_LEGACY) 138 /* 139 * XXX: Legacy: This needs to be upgraded to a full pa management 140 * layer. 141 */ 142 void uvm_physseg_set_avail_start(uvm_physseg_t, paddr_t); 143 void uvm_physseg_set_avail_end(uvm_physseg_t, paddr_t); 144 #endif /* UVM_PHYSSEG_LEGACY */ 145 146 #endif /* _UVM_UVM_PHYSSEG_H_ */ 147
Indexes created Sat Sep 20 22:09:52 GMT 2025