James Hogan | f5df8e2 | 2012-10-09 10:54:17 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005,2006,2007,2008,2009,2010 Imagination Technologies |
| 3 | * |
| 4 | */ |
| 5 | |
James Hogan | 44c2451 | 2013-02-13 13:19:15 +0000 | [diff] [blame^] | 6 | #include <linux/export.h> |
James Hogan | f5df8e2 | 2012-10-09 10:54:17 +0100 | [diff] [blame] | 7 | #include <linux/mm.h> |
| 8 | #include <linux/swap.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/bootmem.h> |
| 11 | #include <linux/pagemap.h> |
| 12 | #include <linux/percpu.h> |
| 13 | #include <linux/memblock.h> |
| 14 | #include <linux/initrd.h> |
| 15 | #include <linux/of_fdt.h> |
| 16 | |
| 17 | #include <asm/setup.h> |
| 18 | #include <asm/page.h> |
| 19 | #include <asm/pgalloc.h> |
| 20 | #include <asm/mmu.h> |
| 21 | #include <asm/mmu_context.h> |
| 22 | #include <asm/sections.h> |
| 23 | #include <asm/tlb.h> |
| 24 | #include <asm/user_gateway.h> |
| 25 | #include <asm/mmzone.h> |
| 26 | #include <asm/fixmap.h> |
| 27 | |
| 28 | unsigned long pfn_base; |
James Hogan | 44c2451 | 2013-02-13 13:19:15 +0000 | [diff] [blame^] | 29 | EXPORT_SYMBOL(pfn_base); |
James Hogan | f5df8e2 | 2012-10-09 10:54:17 +0100 | [diff] [blame] | 30 | |
| 31 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data; |
| 32 | |
| 33 | unsigned long empty_zero_page; |
James Hogan | 44c2451 | 2013-02-13 13:19:15 +0000 | [diff] [blame^] | 34 | EXPORT_SYMBOL(empty_zero_page); |
James Hogan | f5df8e2 | 2012-10-09 10:54:17 +0100 | [diff] [blame] | 35 | |
| 36 | extern char __user_gateway_start; |
| 37 | extern char __user_gateway_end; |
| 38 | |
| 39 | void *gateway_page; |
| 40 | |
| 41 | /* |
| 42 | * Insert the gateway page into a set of page tables, creating the |
| 43 | * page tables if necessary. |
| 44 | */ |
| 45 | static void insert_gateway_page(pgd_t *pgd, unsigned long address) |
| 46 | { |
| 47 | pud_t *pud; |
| 48 | pmd_t *pmd; |
| 49 | pte_t *pte; |
| 50 | |
| 51 | BUG_ON(!pgd_present(*pgd)); |
| 52 | |
| 53 | pud = pud_offset(pgd, address); |
| 54 | BUG_ON(!pud_present(*pud)); |
| 55 | |
| 56 | pmd = pmd_offset(pud, address); |
| 57 | if (!pmd_present(*pmd)) { |
| 58 | pte = alloc_bootmem_pages(PAGE_SIZE); |
| 59 | set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte))); |
| 60 | } |
| 61 | |
| 62 | pte = pte_offset_kernel(pmd, address); |
| 63 | set_pte(pte, pfn_pte(__pa(gateway_page) >> PAGE_SHIFT, PAGE_READONLY)); |
| 64 | } |
| 65 | |
| 66 | /* Alloc and map a page in a known location accessible to userspace. */ |
| 67 | static void __init user_gateway_init(void) |
| 68 | { |
| 69 | unsigned long address = USER_GATEWAY_PAGE; |
| 70 | int offset = pgd_index(address); |
| 71 | pgd_t *pgd; |
| 72 | |
| 73 | gateway_page = alloc_bootmem_pages(PAGE_SIZE); |
| 74 | |
| 75 | pgd = swapper_pg_dir + offset; |
| 76 | insert_gateway_page(pgd, address); |
| 77 | |
| 78 | #ifdef CONFIG_METAG_META12 |
| 79 | /* |
| 80 | * Insert the gateway page into our current page tables even |
| 81 | * though we've already inserted it into our reference page |
| 82 | * table (swapper_pg_dir). This is because with a META1 mmu we |
| 83 | * copy just the user address range and not the gateway page |
| 84 | * entry on context switch, see switch_mmu(). |
| 85 | */ |
| 86 | pgd = (pgd_t *)mmu_get_base() + offset; |
| 87 | insert_gateway_page(pgd, address); |
| 88 | #endif /* CONFIG_METAG_META12 */ |
| 89 | |
| 90 | BUG_ON((&__user_gateway_end - &__user_gateway_start) > PAGE_SIZE); |
| 91 | |
| 92 | gateway_page += (address & ~PAGE_MASK); |
| 93 | |
| 94 | memcpy(gateway_page, &__user_gateway_start, |
| 95 | &__user_gateway_end - &__user_gateway_start); |
| 96 | |
| 97 | /* |
| 98 | * We don't need to flush the TLB here, there should be no mapping |
| 99 | * present at boot for this address and only valid mappings are in |
| 100 | * the TLB (apart from on Meta 1.x, but those cached invalid |
| 101 | * mappings should be impossible to hit here). |
| 102 | * |
| 103 | * We don't flush the code cache here even though we have written |
| 104 | * code through the data cache and they may not be coherent. At |
| 105 | * this point we assume there is no stale data in the code cache |
| 106 | * for this address so there is no need to flush. |
| 107 | */ |
| 108 | } |
| 109 | |
| 110 | static void __init allocate_pgdat(unsigned int nid) |
| 111 | { |
| 112 | unsigned long start_pfn, end_pfn; |
| 113 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 114 | unsigned long phys; |
| 115 | #endif |
| 116 | |
| 117 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); |
| 118 | |
| 119 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 120 | phys = __memblock_alloc_base(sizeof(struct pglist_data), |
| 121 | SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT); |
| 122 | /* Retry with all of system memory */ |
| 123 | if (!phys) |
| 124 | phys = __memblock_alloc_base(sizeof(struct pglist_data), |
| 125 | SMP_CACHE_BYTES, |
| 126 | memblock_end_of_DRAM()); |
| 127 | if (!phys) |
| 128 | panic("Can't allocate pgdat for node %d\n", nid); |
| 129 | |
| 130 | NODE_DATA(nid) = __va(phys); |
| 131 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); |
| 132 | |
| 133 | NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; |
| 134 | #endif |
| 135 | |
| 136 | NODE_DATA(nid)->node_start_pfn = start_pfn; |
| 137 | NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; |
| 138 | } |
| 139 | |
| 140 | static void __init bootmem_init_one_node(unsigned int nid) |
| 141 | { |
| 142 | unsigned long total_pages, paddr; |
| 143 | unsigned long end_pfn; |
| 144 | struct pglist_data *p; |
| 145 | |
| 146 | p = NODE_DATA(nid); |
| 147 | |
| 148 | /* Nothing to do.. */ |
| 149 | if (!p->node_spanned_pages) |
| 150 | return; |
| 151 | |
| 152 | end_pfn = p->node_start_pfn + p->node_spanned_pages; |
| 153 | #ifdef CONFIG_HIGHMEM |
| 154 | if (end_pfn > max_low_pfn) |
| 155 | end_pfn = max_low_pfn; |
| 156 | #endif |
| 157 | |
| 158 | total_pages = bootmem_bootmap_pages(end_pfn - p->node_start_pfn); |
| 159 | |
| 160 | paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE); |
| 161 | if (!paddr) |
| 162 | panic("Can't allocate bootmap for nid[%d]\n", nid); |
| 163 | |
| 164 | init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn); |
| 165 | |
| 166 | free_bootmem_with_active_regions(nid, end_pfn); |
| 167 | |
| 168 | /* |
| 169 | * XXX Handle initial reservations for the system memory node |
| 170 | * only for the moment, we'll refactor this later for handling |
| 171 | * reservations in other nodes. |
| 172 | */ |
| 173 | if (nid == 0) { |
| 174 | struct memblock_region *reg; |
| 175 | |
| 176 | /* Reserve the sections we're already using. */ |
| 177 | for_each_memblock(reserved, reg) { |
| 178 | unsigned long size = reg->size; |
| 179 | |
| 180 | #ifdef CONFIG_HIGHMEM |
| 181 | /* ...but not highmem */ |
| 182 | if (PFN_DOWN(reg->base) >= highstart_pfn) |
| 183 | continue; |
| 184 | |
| 185 | if (PFN_UP(reg->base + size) > highstart_pfn) |
| 186 | size = (highstart_pfn - PFN_DOWN(reg->base)) |
| 187 | << PAGE_SHIFT; |
| 188 | #endif |
| 189 | |
| 190 | reserve_bootmem(reg->base, size, BOOTMEM_DEFAULT); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | sparse_memory_present_with_active_regions(nid); |
| 195 | } |
| 196 | |
| 197 | static void __init do_init_bootmem(void) |
| 198 | { |
| 199 | struct memblock_region *reg; |
| 200 | int i; |
| 201 | |
| 202 | /* Add active regions with valid PFNs. */ |
| 203 | for_each_memblock(memory, reg) { |
| 204 | unsigned long start_pfn, end_pfn; |
| 205 | start_pfn = memblock_region_memory_base_pfn(reg); |
| 206 | end_pfn = memblock_region_memory_end_pfn(reg); |
| 207 | memblock_set_node(PFN_PHYS(start_pfn), |
| 208 | PFN_PHYS(end_pfn - start_pfn), 0); |
| 209 | } |
| 210 | |
| 211 | /* All of system RAM sits in node 0 for the non-NUMA case */ |
| 212 | allocate_pgdat(0); |
| 213 | node_set_online(0); |
| 214 | |
| 215 | soc_mem_setup(); |
| 216 | |
| 217 | for_each_online_node(i) |
| 218 | bootmem_init_one_node(i); |
| 219 | |
| 220 | sparse_init(); |
| 221 | } |
| 222 | |
| 223 | extern char _heap_start[]; |
| 224 | |
| 225 | static void __init init_and_reserve_mem(void) |
| 226 | { |
| 227 | unsigned long start_pfn, heap_start; |
| 228 | u64 base = min_low_pfn << PAGE_SHIFT; |
| 229 | u64 size = (max_low_pfn << PAGE_SHIFT) - base; |
| 230 | |
| 231 | heap_start = (unsigned long) &_heap_start; |
| 232 | |
| 233 | memblock_add(base, size); |
| 234 | |
| 235 | /* |
| 236 | * Partially used pages are not usable - thus |
| 237 | * we are rounding upwards: |
| 238 | */ |
| 239 | start_pfn = PFN_UP(__pa(heap_start)); |
| 240 | |
| 241 | /* |
| 242 | * Reserve the kernel text. |
| 243 | */ |
| 244 | memblock_reserve(base, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - base); |
| 245 | |
| 246 | #ifdef CONFIG_HIGHMEM |
| 247 | /* |
| 248 | * Add & reserve highmem, so page structures are initialised. |
| 249 | */ |
| 250 | base = highstart_pfn << PAGE_SHIFT; |
| 251 | size = (highend_pfn << PAGE_SHIFT) - base; |
| 252 | if (size) { |
| 253 | memblock_add(base, size); |
| 254 | memblock_reserve(base, size); |
| 255 | } |
| 256 | #endif |
| 257 | } |
| 258 | |
| 259 | #ifdef CONFIG_HIGHMEM |
| 260 | /* |
| 261 | * Ensure we have allocated page tables in swapper_pg_dir for the |
| 262 | * fixed mappings range from 'start' to 'end'. |
| 263 | */ |
| 264 | static void __init allocate_pgtables(unsigned long start, unsigned long end) |
| 265 | { |
| 266 | pgd_t *pgd; |
| 267 | pmd_t *pmd; |
| 268 | pte_t *pte; |
| 269 | int i, j; |
| 270 | unsigned long vaddr; |
| 271 | |
| 272 | vaddr = start; |
| 273 | i = pgd_index(vaddr); |
| 274 | j = pmd_index(vaddr); |
| 275 | pgd = swapper_pg_dir + i; |
| 276 | |
| 277 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { |
| 278 | pmd = (pmd_t *)pgd; |
| 279 | for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) { |
| 280 | vaddr += PMD_SIZE; |
| 281 | |
| 282 | if (!pmd_none(*pmd)) |
| 283 | continue; |
| 284 | |
| 285 | pte = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); |
| 286 | pmd_populate_kernel(&init_mm, pmd, pte); |
| 287 | } |
| 288 | j = 0; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | static void __init fixedrange_init(void) |
| 293 | { |
| 294 | unsigned long vaddr, end; |
| 295 | pgd_t *pgd; |
| 296 | pud_t *pud; |
| 297 | pmd_t *pmd; |
| 298 | pte_t *pte; |
| 299 | |
| 300 | /* |
| 301 | * Fixed mappings: |
| 302 | */ |
| 303 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; |
| 304 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
| 305 | allocate_pgtables(vaddr, end); |
| 306 | |
| 307 | /* |
| 308 | * Permanent kmaps: |
| 309 | */ |
| 310 | vaddr = PKMAP_BASE; |
| 311 | allocate_pgtables(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP); |
| 312 | |
| 313 | pgd = swapper_pg_dir + pgd_index(vaddr); |
| 314 | pud = pud_offset(pgd, vaddr); |
| 315 | pmd = pmd_offset(pud, vaddr); |
| 316 | pte = pte_offset_kernel(pmd, vaddr); |
| 317 | pkmap_page_table = pte; |
| 318 | } |
| 319 | #endif /* CONFIG_HIGHMEM */ |
| 320 | |
| 321 | /* |
| 322 | * paging_init() continues the virtual memory environment setup which |
| 323 | * was begun by the code in arch/metag/kernel/setup.c. |
| 324 | */ |
| 325 | void __init paging_init(unsigned long mem_end) |
| 326 | { |
| 327 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| 328 | int nid; |
| 329 | |
| 330 | init_and_reserve_mem(); |
| 331 | |
| 332 | memblock_allow_resize(); |
| 333 | |
| 334 | memblock_dump_all(); |
| 335 | |
| 336 | nodes_clear(node_online_map); |
| 337 | |
| 338 | init_new_context(&init_task, &init_mm); |
| 339 | |
| 340 | memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); |
| 341 | |
| 342 | do_init_bootmem(); |
| 343 | mmu_init(mem_end); |
| 344 | |
| 345 | #ifdef CONFIG_HIGHMEM |
| 346 | fixedrange_init(); |
| 347 | kmap_init(); |
| 348 | #endif |
| 349 | |
| 350 | /* Initialize the zero page to a bootmem page, already zeroed. */ |
| 351 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); |
| 352 | |
| 353 | user_gateway_init(); |
| 354 | |
| 355 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 356 | |
| 357 | for_each_online_node(nid) { |
| 358 | pg_data_t *pgdat = NODE_DATA(nid); |
| 359 | unsigned long low, start_pfn; |
| 360 | |
| 361 | start_pfn = pgdat->bdata->node_min_pfn; |
| 362 | low = pgdat->bdata->node_low_pfn; |
| 363 | |
| 364 | if (max_zone_pfns[ZONE_NORMAL] < low) |
| 365 | max_zone_pfns[ZONE_NORMAL] = low; |
| 366 | |
| 367 | #ifdef CONFIG_HIGHMEM |
| 368 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; |
| 369 | #endif |
| 370 | pr_info("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", |
| 371 | nid, start_pfn, low); |
| 372 | } |
| 373 | |
| 374 | free_area_init_nodes(max_zone_pfns); |
| 375 | } |
| 376 | |
| 377 | void __init mem_init(void) |
| 378 | { |
| 379 | int nid; |
| 380 | |
| 381 | #ifdef CONFIG_HIGHMEM |
| 382 | unsigned long tmp; |
| 383 | for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { |
| 384 | struct page *page = pfn_to_page(tmp); |
| 385 | ClearPageReserved(page); |
| 386 | init_page_count(page); |
| 387 | __free_page(page); |
| 388 | totalhigh_pages++; |
| 389 | } |
| 390 | totalram_pages += totalhigh_pages; |
| 391 | num_physpages += totalhigh_pages; |
| 392 | #endif /* CONFIG_HIGHMEM */ |
| 393 | |
| 394 | for_each_online_node(nid) { |
| 395 | pg_data_t *pgdat = NODE_DATA(nid); |
| 396 | unsigned long node_pages = 0; |
| 397 | |
| 398 | num_physpages += pgdat->node_present_pages; |
| 399 | |
| 400 | if (pgdat->node_spanned_pages) |
| 401 | node_pages = free_all_bootmem_node(pgdat); |
| 402 | |
| 403 | totalram_pages += node_pages; |
| 404 | } |
| 405 | |
| 406 | pr_info("Memory: %luk/%luk available\n", |
| 407 | (unsigned long)nr_free_pages() << (PAGE_SHIFT - 10), |
| 408 | num_physpages << (PAGE_SHIFT - 10)); |
| 409 | |
| 410 | show_mem(0); |
| 411 | |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | static void free_init_pages(char *what, unsigned long begin, unsigned long end) |
| 416 | { |
| 417 | unsigned long addr; |
| 418 | |
| 419 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
| 420 | ClearPageReserved(virt_to_page(addr)); |
| 421 | init_page_count(virt_to_page(addr)); |
| 422 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
| 423 | free_page(addr); |
| 424 | totalram_pages++; |
| 425 | } |
| 426 | pr_info("Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
| 427 | } |
| 428 | |
| 429 | void free_initmem(void) |
| 430 | { |
| 431 | free_init_pages("unused kernel memory", |
| 432 | (unsigned long)(&__init_begin), |
| 433 | (unsigned long)(&__init_end)); |
| 434 | } |
| 435 | |
| 436 | #ifdef CONFIG_BLK_DEV_INITRD |
| 437 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 438 | { |
| 439 | end = end & PAGE_MASK; |
| 440 | free_init_pages("initrd memory", start, end); |
| 441 | } |
| 442 | #endif |
| 443 | |
| 444 | #ifdef CONFIG_OF_FLATTREE |
| 445 | void __init early_init_dt_setup_initrd_arch(unsigned long start, |
| 446 | unsigned long end) |
| 447 | { |
| 448 | pr_err("%s(%lx, %lx)\n", |
| 449 | __func__, start, end); |
| 450 | } |
| 451 | #endif /* CONFIG_OF_FLATTREE */ |