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| 3783 | rimsky | 1 | /* |
| 2 | * Copyright (c) 2009 Pavel Rimsky |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup sparc64 |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | #include <debug.h> |
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| 36 | #include <panic.h> |
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| 37 | #include <func.h> |
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| 38 | #include <print.h> |
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| 39 | #include <arch/sun4v/md.h> |
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| 40 | #include <arch/sun4v/hypercall.h> |
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| 41 | #include <arch/mm/page.h> |
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| 42 | |||
| 43 | /* maximum MD size estimate (in bytes) */ |
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| 3864 | rimsky | 44 | #define MD_MAX_SIZE (64 * 1024) |
| 3783 | rimsky | 45 | |
| 46 | /** element types (element tag values) */ |
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| 47 | #define LIST_END 0x0 /**< End of element list */ |
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| 48 | #define NODE 0x4e /**< Start of node definition */ |
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| 49 | #define NODE_END 0x45 /**< End of node definition */ |
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| 50 | #define NOOP 0x20 /**< NOOP list element - to be ignored */ |
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| 51 | #define PROP_ARC 0x61 /**< Node property arc'ing to another node */ |
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| 52 | #define PROP_VAL 0x76 /**< Node property with an integer value */ |
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| 53 | #define PROP_STR 0x73 /**< Node property with a string value */ |
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| 54 | #define PROP_DATA 0x64 /**< Node property with a block of data */ |
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| 55 | |||
| 56 | |||
| 57 | /** machine description header */ |
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| 58 | typedef struct { |
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| 59 | uint32_t transport_version; /**< Transport version number */ |
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| 60 | uint32_t node_blk_sz; /**< Size in bytes of node block */ |
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| 61 | uint32_t name_blk_sz; /**< Size in bytes of name block */ |
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| 62 | uint32_t data_blk_sz; /**< Size in bytes of data block */ |
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| 63 | } __attribute__ ((packed)) md_header_t; |
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| 64 | |||
| 65 | /** machine description element (in the node block) */ |
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| 66 | typedef struct { |
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| 67 | uint8_t tag; /**< Type of element */ |
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| 68 | uint8_t name_len; /**< Length in bytes of element name */ |
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| 69 | uint16_t _reserved_field; /**< reserved field (zeros) */ |
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| 70 | uint32_t name_offset; /**< Location offset of name associated |
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| 71 | with this element relative to |
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| 72 | start of name block */ |
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| 73 | union { |
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| 74 | /** for elements of type “PROP_STR” and of type “PROP_DATA” */ |
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| 75 | struct { |
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| 76 | /** Length in bytes of data in data block */ |
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| 77 | uint32_t data_len; |
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| 78 | |||
| 79 | /** |
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| 80 | * Location offset of data associated with this |
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| 81 | * element relative to start of data block |
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| 82 | */ |
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| 83 | uint32_t data_offset; |
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| 84 | } y; |
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| 85 | |||
| 86 | /** |
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| 87 | * 64 bit value for elements of tag type “NODE”, “PROP_VAL” |
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| 88 | * or “PROP_ARC” |
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| 89 | */ |
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| 90 | uint64_t val; |
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| 91 | } d; |
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| 92 | } __attribute__ ((packed)) md_element_t; |
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| 93 | |||
| 94 | /** index of the element within the node block */ |
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| 95 | typedef unsigned int element_idx_t; |
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| 96 | |||
| 97 | /** buffer to which the machine description will be saved */ |
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| 98 | static uint8_t mach_desc[MD_MAX_SIZE] |
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| 99 | __attribute__ ((aligned (16))); |
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| 100 | |||
| 101 | |||
| 102 | /** returns pointer to the element at the given index */ |
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| 103 | static md_element_t *get_element(element_idx_t idx) |
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| 104 | { |
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| 105 | return (md_element_t *) ( |
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| 106 | mach_desc + sizeof(md_header_t) + idx * sizeof(md_element_t)); |
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| 107 | } |
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| 108 | |||
| 109 | /** returns the name of the element represented by the index */ |
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| 110 | static const char *get_element_name(element_idx_t idx) |
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| 111 | { |
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| 112 | md_header_t *md_header = (md_header_t *) mach_desc; |
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| 113 | uintptr_t name_offset = get_element(idx)->name_offset; |
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| 114 | return (char *) mach_desc + sizeof(md_header_t) + |
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| 115 | md_header->node_blk_sz + name_offset; |
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| 116 | } |
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| 117 | |||
| 118 | /** finds the name of the node represented by "node" */ |
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| 119 | const char *md_get_node_name(md_node_t node) |
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| 120 | { |
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| 121 | return get_element_name(node); |
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| 122 | } |
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| 123 | |||
| 124 | /** |
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| 125 | * Returns the value of the integer property of the given node. |
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| 126 | * |
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| 127 | * @param |
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| 128 | */ |
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| 129 | bool md_get_integer_property(md_node_t node, const char *key, |
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| 130 | uint64_t *result) |
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| 131 | { |
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| 132 | element_idx_t idx = node; |
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| 133 | |||
| 134 | while (get_element(idx)->tag != NODE_END) { |
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| 135 | idx++; |
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| 136 | md_element_t *element = get_element(idx); |
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| 137 | if (element->tag == PROP_VAL && |
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| 138 | strcmp(key, get_element_name(idx)) == 0) { |
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| 139 | *result = element->d.val; |
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| 140 | return true; |
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| 141 | } |
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| 142 | } |
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| 143 | |||
| 144 | return false; |
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| 145 | } |
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| 146 | |||
| 147 | /** |
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| 148 | * Moves the child oterator to the next child (following sibling of the node |
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| 149 | * the oterator currently points to). |
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| 150 | * |
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| 151 | * @param it pointer to the iterator to be moved |
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| 152 | */ |
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| 153 | bool md_next_child(md_child_iter_t *it) |
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| 154 | { |
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| 155 | element_idx_t backup = *it; |
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| 156 | |||
| 157 | while (get_element(*it)->tag != NODE_END) { |
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| 158 | (*it)++; |
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| 159 | md_element_t *element = get_element(*it); |
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| 160 | if (element->tag == PROP_ARC && |
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| 161 | strcmp("fwd", get_element_name(*it)) == 0) { |
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| 162 | return true; |
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| 163 | } |
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| 164 | } |
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| 165 | |||
| 166 | *it = backup; |
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| 167 | return false; |
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| 168 | } |
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| 169 | |||
| 170 | /** |
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| 171 | * Returns the node the iterator point to. |
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| 172 | */ |
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| 173 | md_node_t md_get_child_node(md_child_iter_t it) |
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| 174 | { |
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| 175 | return get_element(it)->d.val; |
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| 176 | } |
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| 177 | |||
| 178 | /** |
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| 179 | * Helper function used to split a string to a part before the first |
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| 180 | * slash sign and a part after the slash sign. |
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| 181 | * |
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| 182 | * @param str pointer to the string to be split; when the function finishes, |
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| 183 | * it will contain only the part following the first slash sign of |
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| 184 | * the original string |
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| 185 | * @param head pointer to the string which will be set to the part before the |
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| 186 | * first slash sign |
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| 187 | */ |
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| 188 | static bool str_parse_head(char **str, char **head) |
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| 189 | { |
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| 190 | *head = *str; |
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| 191 | |||
| 192 | char *cur = *str; |
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| 193 | while (*cur != '\0') { |
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| 194 | if (*cur == '/') { |
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| 195 | *cur = '\0'; |
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| 196 | *str = cur + 1; |
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| 197 | return true; |
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| 198 | } |
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| 199 | cur++; |
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| 200 | } |
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| 201 | |||
| 202 | return false; |
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| 203 | } |
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| 204 | |||
| 205 | /** |
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| 206 | * Returns the descendant of the given node. The descendant is identified |
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| 207 | * by a path where the node names are separated by a slash. |
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| 208 | * |
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| 209 | * Ex.: Let there be a node N with path "a/b/c/x/y/z" and let P represent the |
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| 210 | * node with path "a/b/c". Then md_get_child(P, "x/y/z") will return N. |
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| 211 | */ |
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| 212 | md_node_t md_get_child(md_node_t node, char *name) |
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| 213 | { |
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| 214 | bool more; |
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| 215 | |||
| 216 | do { |
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| 217 | char *head; |
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| 218 | more = str_parse_head(&name, &head); |
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| 219 | |||
| 220 | while (md_next_child(&node)) { |
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| 221 | element_idx_t child = md_get_child_node(node); |
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| 222 | if (strcmp(head, get_element_name(child)) == 0) { |
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| 223 | node = child; |
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| 224 | break; |
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| 225 | } |
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| 226 | } |
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| 227 | |||
| 228 | } while (more); |
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| 229 | |||
| 230 | return node; |
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| 231 | } |
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| 232 | |||
| 233 | /** returns the root node of MD */ |
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| 234 | md_node_t md_get_root(void) |
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| 235 | { |
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| 236 | return 0; |
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| 237 | } |
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| 238 | |||
| 239 | /** |
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| 240 | * Returns the child iterator - a token to be passed to functions iterating |
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| 241 | * through all the children of a node. |
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| 242 | * |
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| 243 | * @param node a node whose children the iterator will be used |
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| 244 | * to iterate through |
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| 245 | */ |
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| 246 | md_child_iter_t md_get_child_iterator(md_node_t node) |
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| 247 | { |
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| 248 | return node; |
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| 249 | } |
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| 250 | |||
| 251 | /** |
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| 252 | * Moves "node" to the node following "node" in the list of all the existing |
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| 253 | * nodes of the MD whose name is "name". |
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| 254 | */ |
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| 255 | bool md_next_node(md_node_t *node, const char *name) |
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| 256 | { |
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| 257 | md_element_t *element; |
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| 258 | (*node)++; |
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| 259 | |||
| 260 | do { |
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| 261 | element = get_element(*node); |
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| 262 | |||
| 263 | if (element->tag == NODE && |
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| 264 | strcmp(name, get_element_name(*node)) == 0) { |
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| 265 | return true; |
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| 266 | } |
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| 267 | |||
| 268 | (*node)++; |
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| 269 | } while (element->tag != LIST_END); |
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| 270 | |||
| 271 | return false; |
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| 272 | } |
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| 273 | |||
| 274 | /** |
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| 275 | * Retrieves the machine description from the hypervisor and saves it to |
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| 276 | * a kernel buffer. |
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| 277 | */ |
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| 278 | void md_init(void) |
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| 279 | { |
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| 280 | uint64_t retval = __hypercall_fast2(MACH_DESC, KA2PA(mach_desc), |
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| 281 | MD_MAX_SIZE); |
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| 3864 | rimsky | 282 | |
| 3783 | rimsky | 283 | retval = retval; |
| 284 | if (retval != EOK) { |
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| 285 | printf("Could not retrieve machine description, error = %d.\n", |
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| 286 | retval); |
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| 287 | } |
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| 288 | } |
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| 289 | |||
| 290 | /** @} |
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| 291 | */ |