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 #include <sys/param.h> 32 #include <sys/machparam.h> 33 #include <sys/mach_mmu.h> 34 #ifdef __xpv 35 #include <sys/hypervisor.h> 36 #endif 37 38 #ifdef _BOOT 39 #include <dboot/dboot_printf.h> 40 #define bop_panic dboot_panic 41 #else 42 #include <sys/bootconf.h> 43 #endif 44 45 uint_t shift_amt_nopae[] = {12, 22}; 46 uint_t shift_amt_pae[] = {12, 21, 30, 39}; 47 uint_t *shift_amt; 48 uint_t ptes_per_table; 49 uint_t pte_size; 50 uint32_t lpagesize; 51 paddr_t top_page_table; 52 uint_t top_level; 53 54 /* 55 * Return the index corresponding to a virt address at a given page table level. 56 */ 57 static uint_t 58 vatoindex(uint64_t va, uint_t level) 59 { 60 return ((va >> shift_amt[level]) & (ptes_per_table - 1)); 61 } 62 63 /* 64 * Return a pointer to the page table entry that maps a virtual address. 65 * If there is no page table and probe_only is not set, one is created. 66 */ 67 x86pte_t * 68 find_pte(uint64_t va, paddr_t *pa, uint_t level, uint_t probe_only) 69 { 70 uint_t l; 71 uint_t index; 72 paddr_t table; 73 74 if (pa) 75 *pa = 0; 76 77 #ifndef _BOOT 78 if (IN_HYPERVISOR_VA(va)) 79 return (NULL); 80 #endif 81 82 /* 83 * Walk down the page tables creating any needed intermediate tables. 84 */ 85 table = top_page_table; 86 for (l = top_level; l != level; --l) { 87 uint64_t pteval; 88 paddr_t new_table; 89 90 index = vatoindex(va, l); 91 pteval = get_pteval(table, index); 92 93 /* 94 * Life is easy if we find the pagetable. We just use it. 95 */ 96 if (pteval & PT_VALID) { 97 table = ma_to_pa(pteval & MMU_PAGEMASK); 98 if (table == -1) { 99 if (probe_only) 100 return (NULL); 101 bop_panic("find_pte(): phys not found!"); 102 } 103 continue; 104 } 105 106 if (probe_only) 107 return (NULL); 108 109 new_table = make_ptable(&pteval, l); 110 set_pteval(table, index, l, pteval); 111 112 table = new_table; 113 } 114 115 /* 116 * Return a pointer into the current pagetable. 117 */ 118 index = vatoindex(va, l); 119 if (pa) 120 *pa = table + index * pte_size; 121 return (map_pte(table, index)); 122 } 123