1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * WARNING: This file is used by both dboot and the kernel. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #include <sys/param.h> 34 #include <sys/machparam.h> 35 #include <sys/mach_mmu.h> 36 #ifdef __xpv 37 #include <sys/hypervisor.h> 38 #endif 39 40 #ifdef _BOOT 41 #include <dboot/dboot_printf.h> 42 #define bop_panic dboot_panic 43 #else 44 #include <sys/bootconf.h> 45 #endif 46 47 uint_t shift_amt_nopae[] = {12, 22}; 48 uint_t shift_amt_pae[] = {12, 21, 30, 39}; 49 uint_t *shift_amt; 50 uint_t ptes_per_table; 51 uint_t pte_size; 52 uint32_t lpagesize; 53 paddr_t top_page_table; 54 uint_t top_level; 55 56 /* 57 * Return the index corresponding to a virt address at a given page table level. 58 */ 59 static uint_t 60 vatoindex(uint64_t va, uint_t level) 61 { 62 return ((va >> shift_amt[level]) & (ptes_per_table - 1)); 63 } 64 65 /* 66 * Return a pointer to the page table entry that maps a virtual address. 67 * If there is no page table and probe_only is not set, one is created. 68 */ 69 x86pte_t * 70 find_pte(uint64_t va, paddr_t *pa, uint_t level, uint_t probe_only) 71 { 72 uint_t l; 73 uint_t index; 74 paddr_t table; 75 76 if (pa) 77 *pa = 0; 78 79 #ifndef _BOOT 80 if (IN_HYPERVISOR_VA(va)) 81 return (NULL); 82 #endif 83 84 /* 85 * Walk down the page tables creating any needed intermediate tables. 86 */ 87 table = top_page_table; 88 for (l = top_level; l != level; --l) { 89 uint64_t pteval; 90 paddr_t new_table; 91 92 index = vatoindex(va, l); 93 pteval = get_pteval(table, index); 94 95 /* 96 * Life is easy if we find the pagetable. We just use it. 97 */ 98 if (pteval & PT_VALID) { 99 table = ma_to_pa(pteval & MMU_PAGEMASK); 100 if (table == -1) { 101 if (probe_only) 102 return (NULL); 103 bop_panic("find_pte(): phys not found!"); 104 } 105 continue; 106 } 107 108 if (probe_only) 109 return (NULL); 110 111 new_table = make_ptable(&pteval, l); 112 set_pteval(table, index, l, pteval); 113 114 table = new_table; 115 } 116 117 /* 118 * Return a pointer into the current pagetable. 119 */ 120 index = vatoindex(va, l); 121 if (pa) 122 *pa = table + index * pte_size; 123 return (map_pte(table, index)); 124 } 125