Soby Mathew | 44170c4 | 2016-03-22 15:51:08 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <arch.h> |
| 32 | #include <arch_helpers.h> |
| 33 | #include <assert.h> |
| 34 | #include <bl_common.h> |
| 35 | #include <cassert.h> |
| 36 | #include <debug.h> |
| 37 | #include <platform_def.h> |
| 38 | #include <string.h> |
| 39 | #include <xlat_tables.h> |
| 40 | |
| 41 | #if LOG_LEVEL >= LOG_LEVEL_VERBOSE |
| 42 | #define LVL0_SPACER "" |
| 43 | #define LVL1_SPACER " " |
| 44 | #define LVL2_SPACER " " |
| 45 | #define LVL3_SPACER " " |
| 46 | #define get_level_spacer(level) \ |
| 47 | (((level) == 0) ? LVL0_SPACER : \ |
| 48 | (((level) == 1) ? LVL1_SPACER : \ |
| 49 | (((level) == 2) ? LVL2_SPACER : LVL3_SPACER))) |
| 50 | #define debug_print(...) tf_printf(__VA_ARGS__) |
| 51 | #else |
| 52 | #define debug_print(...) ((void)0) |
| 53 | #endif |
| 54 | |
| 55 | #define UNSET_DESC ~0ul |
| 56 | |
| 57 | static uint64_t xlat_tables[MAX_XLAT_TABLES][XLAT_TABLE_ENTRIES] |
| 58 | __aligned(XLAT_TABLE_SIZE) __section("xlat_table"); |
| 59 | |
| 60 | static unsigned next_xlat; |
| 61 | static unsigned long long xlat_max_pa; |
| 62 | static uintptr_t xlat_max_va; |
| 63 | |
| 64 | /* |
| 65 | * Array of all memory regions stored in order of ascending base address. |
| 66 | * The list is terminated by the first entry with size == 0. |
| 67 | */ |
| 68 | static mmap_region_t mmap[MAX_MMAP_REGIONS + 1]; |
| 69 | |
| 70 | |
| 71 | void print_mmap(void) |
| 72 | { |
| 73 | #if LOG_LEVEL >= LOG_LEVEL_VERBOSE |
| 74 | debug_print("mmap:\n"); |
| 75 | mmap_region_t *mm = mmap; |
| 76 | while (mm->size) { |
| 77 | debug_print(" VA:%p PA:0x%llx size:0x%zx attr:0x%x\n", |
| 78 | (void *)mm->base_va, mm->base_pa, |
| 79 | mm->size, mm->attr); |
| 80 | ++mm; |
| 81 | }; |
| 82 | debug_print("\n"); |
| 83 | #endif |
| 84 | } |
| 85 | |
| 86 | void mmap_add_region(unsigned long long base_pa, uintptr_t base_va, |
| 87 | size_t size, unsigned int attr) |
| 88 | { |
| 89 | mmap_region_t *mm = mmap; |
| 90 | mmap_region_t *mm_last = mm + ARRAY_SIZE(mmap) - 1; |
| 91 | unsigned long long pa_end = base_pa + size - 1; |
| 92 | uintptr_t va_end = base_va + size - 1; |
| 93 | |
| 94 | assert(IS_PAGE_ALIGNED(base_pa)); |
| 95 | assert(IS_PAGE_ALIGNED(base_va)); |
| 96 | assert(IS_PAGE_ALIGNED(size)); |
| 97 | |
| 98 | if (!size) |
| 99 | return; |
| 100 | |
| 101 | /* Find correct place in mmap to insert new region */ |
| 102 | while (mm->base_va < base_va && mm->size) |
| 103 | ++mm; |
| 104 | |
| 105 | /* Make room for new region by moving other regions up by one place */ |
| 106 | memmove(mm + 1, mm, (uintptr_t)mm_last - (uintptr_t)mm); |
| 107 | |
| 108 | /* Check we haven't lost the empty sentinal from the end of the array */ |
| 109 | assert(mm_last->size == 0); |
| 110 | |
| 111 | mm->base_pa = base_pa; |
| 112 | mm->base_va = base_va; |
| 113 | mm->size = size; |
| 114 | mm->attr = attr; |
| 115 | |
| 116 | if (pa_end > xlat_max_pa) |
| 117 | xlat_max_pa = pa_end; |
| 118 | if (va_end > xlat_max_va) |
| 119 | xlat_max_va = va_end; |
| 120 | } |
| 121 | |
| 122 | void mmap_add(const mmap_region_t *mm) |
| 123 | { |
| 124 | while (mm->size) { |
| 125 | mmap_add_region(mm->base_pa, mm->base_va, mm->size, mm->attr); |
| 126 | ++mm; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | static uint64_t mmap_desc(unsigned attr, unsigned long long addr_pa, |
| 131 | int level) |
| 132 | { |
| 133 | uint64_t desc = addr_pa; |
| 134 | int mem_type; |
| 135 | |
| 136 | desc |= level == 3 ? TABLE_DESC : BLOCK_DESC; |
| 137 | |
| 138 | desc |= attr & MT_NS ? LOWER_ATTRS(NS) : 0; |
| 139 | |
| 140 | desc |= attr & MT_RW ? LOWER_ATTRS(AP_RW) : LOWER_ATTRS(AP_RO); |
| 141 | |
| 142 | desc |= LOWER_ATTRS(ACCESS_FLAG); |
| 143 | |
| 144 | mem_type = MT_TYPE(attr); |
| 145 | if (mem_type == MT_MEMORY) { |
| 146 | desc |= LOWER_ATTRS(ATTR_IWBWA_OWBWA_NTR_INDEX | ISH); |
| 147 | if (attr & MT_RW) |
| 148 | desc |= UPPER_ATTRS(XN); |
| 149 | } else if (mem_type == MT_NON_CACHEABLE) { |
| 150 | desc |= LOWER_ATTRS(ATTR_NON_CACHEABLE_INDEX | OSH); |
| 151 | if (attr & MT_RW) |
| 152 | desc |= UPPER_ATTRS(XN); |
| 153 | } else { |
| 154 | assert(mem_type == MT_DEVICE); |
| 155 | desc |= LOWER_ATTRS(ATTR_DEVICE_INDEX | OSH); |
| 156 | desc |= UPPER_ATTRS(XN); |
| 157 | } |
| 158 | |
| 159 | debug_print((mem_type == MT_MEMORY) ? "MEM" : |
| 160 | ((mem_type == MT_NON_CACHEABLE) ? "NC" : "DEV")); |
| 161 | debug_print(attr & MT_RW ? "-RW" : "-RO"); |
| 162 | debug_print(attr & MT_NS ? "-NS" : "-S"); |
| 163 | |
| 164 | return desc; |
| 165 | } |
| 166 | |
| 167 | static int mmap_region_attr(mmap_region_t *mm, uintptr_t base_va, |
| 168 | size_t size) |
| 169 | { |
| 170 | int attr = mm->attr; |
| 171 | int old_mem_type, new_mem_type; |
| 172 | |
| 173 | for (;;) { |
| 174 | ++mm; |
| 175 | |
| 176 | if (!mm->size) |
| 177 | return attr; /* Reached end of list */ |
| 178 | |
| 179 | if (mm->base_va >= base_va + size) |
| 180 | return attr; /* Next region is after area so end */ |
| 181 | |
| 182 | if (mm->base_va + mm->size <= base_va) |
| 183 | continue; /* Next region has already been overtaken */ |
| 184 | |
| 185 | if ((mm->attr & attr) == attr) |
| 186 | continue; /* Region doesn't override attribs so skip */ |
| 187 | |
| 188 | /* |
| 189 | * Update memory mapping attributes in 2 steps: |
| 190 | * 1) Update access permissions and security state flags |
| 191 | * 2) Update memory type. |
| 192 | * |
| 193 | * See xlat_tables.h for details about the attributes priority |
| 194 | * system and the rules dictating whether attributes should be |
| 195 | * updated. |
| 196 | */ |
| 197 | old_mem_type = MT_TYPE(attr); |
| 198 | new_mem_type = MT_TYPE(mm->attr); |
| 199 | attr &= mm->attr; |
| 200 | if (new_mem_type < old_mem_type) |
| 201 | attr = (attr & ~MT_TYPE_MASK) | new_mem_type; |
| 202 | |
| 203 | if (mm->base_va > base_va || |
| 204 | mm->base_va + mm->size < base_va + size) |
| 205 | return -1; /* Region doesn't fully cover our area */ |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | static mmap_region_t *init_xlation_table_inner(mmap_region_t *mm, |
| 210 | uintptr_t base_va, |
| 211 | uint64_t *table, |
| 212 | int level) |
| 213 | { |
| 214 | unsigned level_size_shift = L1_XLAT_ADDRESS_SHIFT - (level - 1) * |
| 215 | XLAT_TABLE_ENTRIES_SHIFT; |
| 216 | unsigned level_size = 1 << level_size_shift; |
| 217 | unsigned long long level_index_mask = XLAT_TABLE_ENTRIES_MASK << |
| 218 | level_size_shift; |
| 219 | |
| 220 | assert(level > 0 && level <= 3); |
| 221 | |
| 222 | debug_print("New xlat table:\n"); |
| 223 | |
| 224 | do { |
| 225 | uint64_t desc = UNSET_DESC; |
| 226 | |
| 227 | if (!mm->size) { |
| 228 | /* Done mapping regions; finish zeroing the table */ |
| 229 | desc = INVALID_DESC; |
| 230 | } else if (mm->base_va + mm->size <= base_va) { |
| 231 | /* Area now after the region so skip it */ |
| 232 | ++mm; |
| 233 | continue; |
| 234 | } |
| 235 | |
| 236 | debug_print("%s VA:%p size:0x%x ", get_level_spacer(level), |
| 237 | (void *)base_va, level_size); |
| 238 | |
| 239 | if (mm->base_va >= base_va + level_size) { |
| 240 | /* Next region is after area so nothing to map yet */ |
| 241 | desc = INVALID_DESC; |
| 242 | } else if (mm->base_va <= base_va && mm->base_va + mm->size >= |
| 243 | base_va + level_size) { |
| 244 | /* Next region covers all of area */ |
| 245 | int attr = mmap_region_attr(mm, base_va, level_size); |
| 246 | if (attr >= 0) |
| 247 | desc = mmap_desc(attr, |
| 248 | base_va - mm->base_va + mm->base_pa, |
| 249 | level); |
| 250 | } |
| 251 | /* else Next region only partially covers area, so need */ |
| 252 | |
| 253 | if (desc == UNSET_DESC) { |
| 254 | /* Area not covered by a region so need finer table */ |
| 255 | uint64_t *new_table = xlat_tables[next_xlat++]; |
| 256 | assert(next_xlat <= MAX_XLAT_TABLES); |
| 257 | desc = TABLE_DESC | (unsigned long)new_table; |
| 258 | |
| 259 | /* Recurse to fill in new table */ |
| 260 | mm = init_xlation_table_inner(mm, base_va, |
| 261 | new_table, level+1); |
| 262 | } |
| 263 | |
| 264 | debug_print("\n"); |
| 265 | |
| 266 | *table++ = desc; |
| 267 | base_va += level_size; |
| 268 | } while ((base_va & level_index_mask) && (base_va < ADDR_SPACE_SIZE)); |
| 269 | |
| 270 | return mm; |
| 271 | } |
| 272 | |
| 273 | void init_xlation_table(uintptr_t base_va, uint64_t *table, |
| 274 | int level, uintptr_t *max_va, |
| 275 | unsigned long long *max_pa) |
| 276 | { |
| 277 | |
| 278 | init_xlation_table_inner(mmap, base_va, table, level); |
| 279 | *max_va = xlat_max_va; |
| 280 | *max_pa = xlat_max_pa; |
| 281 | } |