1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/sh/mm/init.c 4 * 5 * Copyright (C) 1999 Niibe Yutaka 6 * Copyright (C) 2002 - 2011 Paul Mundt 7 * 8 * Based on linux/arch/i386/mm/init.c: 9 * Copyright (C) 1995 Linus Torvalds 10 */ 11 #include <linux/mm.h> 12 #include <linux/swap.h> 13 #include <linux/init.h> 14 #include <linux/gfp.h> 15 #include <linux/memblock.h> 16 #include <linux/proc_fs.h> 17 #include <linux/pagemap.h> 18 #include <linux/percpu.h> 19 #include <linux/io.h> 20 #include <linux/dma-mapping.h> 21 #include <linux/export.h> 22 #include <asm/mmu_context.h> 23 #include <asm/mmzone.h> 24 #include <asm/kexec.h> 25 #include <asm/tlb.h> 26 #include <asm/cacheflush.h> 27 #include <asm/sections.h> 28 #include <asm/setup.h> 29 #include <asm/cache.h> 30 #include <linux/sizes.h> 31 32 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 33 34 void __init generic_mem_init(void) 35 { 36 memblock_add(__MEMORY_START, __MEMORY_SIZE); 37 } 38 39 void __init __weak plat_mem_setup(void) 40 { 41 /* Nothing to see here, move along. */ 42 } 43 44 #ifdef CONFIG_MMU 45 static pte_t *__get_pte_phys(unsigned long addr) 46 { 47 pgd_t *pgd; 48 pud_t *pud; 49 pmd_t *pmd; 50 51 pgd = pgd_offset_k(addr); 52 if (pgd_none(*pgd)) { 53 pgd_ERROR(*pgd); 54 return NULL; 55 } 56 57 pud = pud_alloc(NULL, pgd, addr); 58 if (unlikely(!pud)) { 59 pud_ERROR(*pud); 60 return NULL; 61 } 62 63 pmd = pmd_alloc(NULL, pud, addr); 64 if (unlikely(!pmd)) { 65 pmd_ERROR(*pmd); 66 return NULL; 67 } 68 69 return pte_offset_kernel(pmd, addr); 70 } 71 72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 73 { 74 pte_t *pte; 75 76 pte = __get_pte_phys(addr); 77 if (!pte_none(*pte)) { 78 pte_ERROR(*pte); 79 return; 80 } 81 82 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 83 local_flush_tlb_one(get_asid(), addr); 84 85 if (pgprot_val(prot) & _PAGE_WIRED) 86 tlb_wire_entry(NULL, addr, *pte); 87 } 88 89 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 90 { 91 pte_t *pte; 92 93 pte = __get_pte_phys(addr); 94 95 if (pgprot_val(prot) & _PAGE_WIRED) 96 tlb_unwire_entry(); 97 98 set_pte(pte, pfn_pte(0, __pgprot(0))); 99 local_flush_tlb_one(get_asid(), addr); 100 } 101 102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 103 { 104 unsigned long address = __fix_to_virt(idx); 105 106 if (idx >= __end_of_fixed_addresses) { 107 BUG(); 108 return; 109 } 110 111 set_pte_phys(address, phys, prot); 112 } 113 114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 115 { 116 unsigned long address = __fix_to_virt(idx); 117 118 if (idx >= __end_of_fixed_addresses) { 119 BUG(); 120 return; 121 } 122 123 clear_pte_phys(address, prot); 124 } 125 126 static pmd_t * __init one_md_table_init(pud_t *pud) 127 { 128 if (pud_none(*pud)) { 129 pmd_t *pmd; 130 131 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 132 if (!pmd) 133 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 134 __func__, PAGE_SIZE, PAGE_SIZE); 135 pud_populate(&init_mm, pud, pmd); 136 BUG_ON(pmd != pmd_offset(pud, 0)); 137 } 138 139 return pmd_offset(pud, 0); 140 } 141 142 static pte_t * __init one_page_table_init(pmd_t *pmd) 143 { 144 if (pmd_none(*pmd)) { 145 pte_t *pte; 146 147 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 148 if (!pte) 149 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 150 __func__, PAGE_SIZE, PAGE_SIZE); 151 pmd_populate_kernel(&init_mm, pmd, pte); 152 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 153 } 154 155 return pte_offset_kernel(pmd, 0); 156 } 157 158 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 159 unsigned long vaddr, pte_t *lastpte) 160 { 161 return pte; 162 } 163 164 void __init page_table_range_init(unsigned long start, unsigned long end, 165 pgd_t *pgd_base) 166 { 167 pgd_t *pgd; 168 pud_t *pud; 169 pmd_t *pmd; 170 pte_t *pte = NULL; 171 int i, j, k; 172 unsigned long vaddr; 173 174 vaddr = start; 175 i = __pgd_offset(vaddr); 176 j = __pud_offset(vaddr); 177 k = __pmd_offset(vaddr); 178 pgd = pgd_base + i; 179 180 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 181 pud = (pud_t *)pgd; 182 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 183 pmd = one_md_table_init(pud); 184 #ifndef __PAGETABLE_PMD_FOLDED 185 pmd += k; 186 #endif 187 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 188 pte = page_table_kmap_check(one_page_table_init(pmd), 189 pmd, vaddr, pte); 190 vaddr += PMD_SIZE; 191 } 192 k = 0; 193 } 194 j = 0; 195 } 196 } 197 #endif /* CONFIG_MMU */ 198 199 void __init allocate_pgdat(unsigned int nid) 200 { 201 unsigned long start_pfn, end_pfn; 202 203 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 204 205 #ifdef CONFIG_NEED_MULTIPLE_NODES 206 NODE_DATA(nid) = memblock_alloc_try_nid( 207 sizeof(struct pglist_data), 208 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT, 209 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 210 if (!NODE_DATA(nid)) 211 panic("Can't allocate pgdat for node %d\n", nid); 212 #endif 213 214 NODE_DATA(nid)->node_start_pfn = start_pfn; 215 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 216 } 217 218 static void __init do_init_bootmem(void) 219 { 220 struct memblock_region *reg; 221 222 /* Add active regions with valid PFNs. */ 223 for_each_memblock(memory, reg) { 224 unsigned long start_pfn, end_pfn; 225 start_pfn = memblock_region_memory_base_pfn(reg); 226 end_pfn = memblock_region_memory_end_pfn(reg); 227 __add_active_range(0, start_pfn, end_pfn); 228 } 229 230 /* All of system RAM sits in node 0 for the non-NUMA case */ 231 allocate_pgdat(0); 232 node_set_online(0); 233 234 plat_mem_setup(); 235 236 for_each_memblock(memory, reg) { 237 int nid = memblock_get_region_node(reg); 238 239 memory_present(nid, memblock_region_memory_base_pfn(reg), 240 memblock_region_memory_end_pfn(reg)); 241 } 242 sparse_init(); 243 } 244 245 static void __init early_reserve_mem(void) 246 { 247 unsigned long start_pfn; 248 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 249 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 250 251 /* 252 * Partially used pages are not usable - thus 253 * we are rounding upwards: 254 */ 255 start_pfn = PFN_UP(__pa(_end)); 256 257 /* 258 * Reserve the kernel text and Reserve the bootmem bitmap. We do 259 * this in two steps (first step was init_bootmem()), because 260 * this catches the (definitely buggy) case of us accidentally 261 * initializing the bootmem allocator with an invalid RAM area. 262 */ 263 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 264 265 /* 266 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 267 */ 268 if (CONFIG_ZERO_PAGE_OFFSET != 0) 269 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 270 271 /* 272 * Handle additional early reservations 273 */ 274 check_for_initrd(); 275 reserve_crashkernel(); 276 } 277 278 void __init paging_init(void) 279 { 280 unsigned long max_zone_pfns[MAX_NR_ZONES]; 281 unsigned long vaddr, end; 282 283 sh_mv.mv_mem_init(); 284 285 early_reserve_mem(); 286 287 /* 288 * Once the early reservations are out of the way, give the 289 * platforms a chance to kick out some memory. 290 */ 291 if (sh_mv.mv_mem_reserve) 292 sh_mv.mv_mem_reserve(); 293 294 memblock_enforce_memory_limit(memory_limit); 295 memblock_allow_resize(); 296 297 memblock_dump_all(); 298 299 /* 300 * Determine low and high memory ranges: 301 */ 302 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 303 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 304 305 nodes_clear(node_online_map); 306 307 memory_start = (unsigned long)__va(__MEMORY_START); 308 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 309 310 uncached_init(); 311 pmb_init(); 312 do_init_bootmem(); 313 ioremap_fixed_init(); 314 315 /* We don't need to map the kernel through the TLB, as 316 * it is permanatly mapped using P1. So clear the 317 * entire pgd. */ 318 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 319 320 /* Set an initial value for the MMU.TTB so we don't have to 321 * check for a null value. */ 322 set_TTB(swapper_pg_dir); 323 324 /* 325 * Populate the relevant portions of swapper_pg_dir so that 326 * we can use the fixmap entries without calling kmalloc. 327 * pte's will be filled in by __set_fixmap(). 328 */ 329 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 330 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 331 page_table_range_init(vaddr, end, swapper_pg_dir); 332 333 kmap_coherent_init(); 334 335 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 336 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 337 free_area_init_nodes(max_zone_pfns); 338 } 339 340 unsigned int mem_init_done = 0; 341 342 void __init mem_init(void) 343 { 344 pg_data_t *pgdat; 345 346 high_memory = NULL; 347 for_each_online_pgdat(pgdat) 348 high_memory = max_t(void *, high_memory, 349 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 350 351 memblock_free_all(); 352 353 /* Set this up early, so we can take care of the zero page */ 354 cpu_cache_init(); 355 356 /* clear the zero-page */ 357 memset(empty_zero_page, 0, PAGE_SIZE); 358 __flush_wback_region(empty_zero_page, PAGE_SIZE); 359 360 vsyscall_init(); 361 362 mem_init_print_info(NULL); 363 pr_info("virtual kernel memory layout:\n" 364 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 365 #ifdef CONFIG_HIGHMEM 366 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 367 #endif 368 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 369 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 370 #ifdef CONFIG_UNCACHED_MAPPING 371 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 372 #endif 373 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 374 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 375 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 376 FIXADDR_START, FIXADDR_TOP, 377 (FIXADDR_TOP - FIXADDR_START) >> 10, 378 379 #ifdef CONFIG_HIGHMEM 380 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 381 (LAST_PKMAP*PAGE_SIZE) >> 10, 382 #endif 383 384 (unsigned long)VMALLOC_START, VMALLOC_END, 385 (VMALLOC_END - VMALLOC_START) >> 20, 386 387 (unsigned long)memory_start, (unsigned long)high_memory, 388 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 389 390 #ifdef CONFIG_UNCACHED_MAPPING 391 uncached_start, uncached_end, uncached_size >> 20, 392 #endif 393 394 (unsigned long)&__init_begin, (unsigned long)&__init_end, 395 ((unsigned long)&__init_end - 396 (unsigned long)&__init_begin) >> 10, 397 398 (unsigned long)&_etext, (unsigned long)&_edata, 399 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 400 401 (unsigned long)&_text, (unsigned long)&_etext, 402 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 403 404 mem_init_done = 1; 405 } 406 407 #ifdef CONFIG_MEMORY_HOTPLUG 408 int arch_add_memory(int nid, u64 start, u64 size, 409 struct mhp_restrictions *restrictions) 410 { 411 unsigned long start_pfn = PFN_DOWN(start); 412 unsigned long nr_pages = size >> PAGE_SHIFT; 413 int ret; 414 415 /* We only have ZONE_NORMAL, so this is easy.. */ 416 ret = __add_pages(nid, start_pfn, nr_pages, restrictions); 417 if (unlikely(ret)) 418 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 419 420 return ret; 421 } 422 423 #ifdef CONFIG_NUMA 424 int memory_add_physaddr_to_nid(u64 addr) 425 { 426 /* Node 0 for now.. */ 427 return 0; 428 } 429 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 430 #endif 431 432 void arch_remove_memory(int nid, u64 start, u64 size, 433 struct vmem_altmap *altmap) 434 { 435 unsigned long start_pfn = PFN_DOWN(start); 436 unsigned long nr_pages = size >> PAGE_SHIFT; 437 438 __remove_pages(start_pfn, nr_pages, altmap); 439 } 440 #endif /* CONFIG_MEMORY_HOTPLUG */ 441