1 /* $NetBSD: pmap_devmap.c,v 1.2 2023/04/27 06:23:31 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2022 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 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 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: pmap_devmap.c,v 1.2 2023/04/27 06:23:31 skrll Exp $"); 34 35 36 #include <sys/param.h> 37 #include <sys/types.h> 38 39 #include <uvm/uvm.h> 40 #include <uvm/uvm_extern.h> 41 #include <uvm/pmap/pmap_devmap.h> 42 43 44 static const struct pmap_devmap *pd_table; 45 static vaddr_t pd_root; 46 47 bool pmap_devmap_bootstrap_done = false; 48 49 bool 50 pmap_devmap_bootstrapped_p(void) 51 { 52 return pmap_devmap_bootstrap_done; 53 } 54 55 56 vaddr_t 57 pmap_devmap_root(void) 58 { 59 return pd_root; 60 } 61 62 /* 63 * Register the devmap table. This is provided in case early console 64 * initialization needs to register mappings created by bootstrap code 65 * before pmap_devmap_bootstrap() is called. 66 */ 67 void 68 pmap_devmap_register(const struct pmap_devmap *table) 69 { 70 71 pd_table = table; 72 } 73 74 /* 75 * Map all of the static regions in the devmap table, and remember 76 * the devmap table so other parts of the kernel can look up entries 77 * later. 78 */ 79 void 80 pmap_devmap_bootstrap(vaddr_t root, const struct pmap_devmap *table) 81 { 82 UVMHIST_FUNC(__func__); 83 UVMHIST_CALLARGS(maphist, "(root=%#jx, table=%p)", root, 84 (uintptr_t)table, 0, 0); 85 86 bool done = false; 87 88 pd_root = root; 89 pd_table = table; 90 91 for (size_t i = 0; table[i].pd_size != 0; i++) { 92 const struct pmap_devmap * const pdp = &table[i]; 93 const vaddr_t vmax = __type_max_u(vaddr_t); 94 const paddr_t pmax = __type_max_u(paddr_t); 95 96 KASSERT(pdp->pd_size != 0); 97 KASSERTMSG(vmax - pdp->pd_va >= pdp->pd_size - 1, 98 "va %" PRIxVADDR " sz %" PRIxPSIZE, pdp->pd_va, 99 pdp->pd_size); 100 KASSERTMSG(pmax - pdp->pd_pa >= pdp->pd_size - 1, 101 "pa %" PRIxPADDR " sz %" PRIxPSIZE, pdp->pd_pa, 102 pdp->pd_size); 103 UVMHIST_LOG(maphist, 104 "pa %#jx -> %#jx @ va %#jx -> %#jx", 105 pdp->pd_pa, pdp->pd_pa + pdp->pd_size - 1, 106 pdp->pd_va, pdp->pd_va + pdp->pd_size - 1); 107 108 pmap_kenter_range(pdp->pd_va, pdp->pd_pa, pdp->pd_size, 109 pdp->pd_prot, pdp->pd_flags); 110 done = true; 111 } 112 if (done) 113 pmap_devmap_bootstrap_done = true; 114 } 115 116 /* 117 * Find the table entry that fully covers the physical address 118 * range [pa, pa + size) 119 */ 120 const struct pmap_devmap * 121 pmap_devmap_find_pa(paddr_t pa, psize_t size) 122 { 123 if (pd_table == NULL) 124 return NULL; 125 126 for (size_t i = 0; pd_table[i].pd_size != 0; i++) { 127 const paddr_t pd_pa = pd_table[i].pd_pa; 128 const psize_t pd_sz = pd_table[i].pd_size; 129 130 if (pa < pd_pa) 131 continue; 132 133 const psize_t pdiff = pa - pd_pa; 134 135 if (pd_sz < pdiff) 136 continue; 137 138 if (pd_sz - pdiff >= size) 139 return &pd_table[i]; 140 } 141 142 return NULL; 143 } 144 145 /* 146 * Find the table entry that fully covers the virtual address 147 * range [va, va + size) 148 */ 149 const struct pmap_devmap * 150 pmap_devmap_find_va(vaddr_t va, vsize_t size) 151 { 152 if (pd_table == NULL) 153 return NULL; 154 155 for (size_t i = 0; pd_table[i].pd_size != 0; i++) { 156 const vaddr_t pd_va = pd_table[i].pd_va; 157 const vsize_t pd_sz = pd_table[i].pd_size; 158 159 if (va < pd_va) 160 continue; 161 162 const vsize_t vdiff = va - pd_va; 163 164 if (pd_sz < vdiff) 165 continue; 166 167 if (pd_sz - vdiff >= size) 168 return &pd_table[i]; 169 170 } 171 172 return NULL; 173 } 174