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