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 <asm/pgalloc.h> 31 #include <linux/sizes.h> 32 33 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 34 35 void __init generic_mem_init(void) 36 { 37 memblock_add(__MEMORY_START, __MEMORY_SIZE); 38 } 39 40 void __init __weak plat_mem_setup(void) 41 { 42 /* Nothing to see here, move along. */ 43 } 44 45 #ifdef CONFIG_MMU 46 static pte_t *__get_pte_phys(unsigned long addr) 47 { 48 pgd_t *pgd; 49 p4d_t *p4d; 50 pud_t *pud; 51 pmd_t *pmd; 52 53 pgd = pgd_offset_k(addr); 54 if (pgd_none(*pgd)) { 55 pgd_ERROR(*pgd); 56 return NULL; 57 } 58 59 p4d = p4d_alloc(NULL, pgd, addr); 60 if (unlikely(!p4d)) { 61 p4d_ERROR(*p4d); 62 return NULL; 63 } 64 65 pud = pud_alloc(NULL, p4d, addr); 66 if (unlikely(!pud)) { 67 pud_ERROR(*pud); 68 return NULL; 69 } 70 71 pmd = pmd_alloc(NULL, pud, addr); 72 if (unlikely(!pmd)) { 73 pmd_ERROR(*pmd); 74 return NULL; 75 } 76 77 return pte_offset_kernel(pmd, addr); 78 } 79 80 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 81 { 82 pte_t *pte; 83 84 pte = __get_pte_phys(addr); 85 if (!pte_none(*pte)) { 86 pte_ERROR(*pte); 87 return; 88 } 89 90 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 91 local_flush_tlb_one(get_asid(), addr); 92 93 if (pgprot_val(prot) & _PAGE_WIRED) 94 tlb_wire_entry(NULL, addr, *pte); 95 } 96 97 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 98 { 99 pte_t *pte; 100 101 pte = __get_pte_phys(addr); 102 103 if (pgprot_val(prot) & _PAGE_WIRED) 104 tlb_unwire_entry(); 105 106 set_pte(pte, pfn_pte(0, __pgprot(0))); 107 local_flush_tlb_one(get_asid(), addr); 108 } 109 110 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 111 { 112 unsigned long address = __fix_to_virt(idx); 113 114 if (idx >= __end_of_fixed_addresses) { 115 BUG(); 116 return; 117 } 118 119 set_pte_phys(address, phys, prot); 120 } 121 122 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 123 { 124 unsigned long address = __fix_to_virt(idx); 125 126 if (idx >= __end_of_fixed_addresses) { 127 BUG(); 128 return; 129 } 130 131 clear_pte_phys(address, prot); 132 } 133 134 static pmd_t * __init one_md_table_init(pud_t *pud) 135 { 136 if (pud_none(*pud)) { 137 pmd_t *pmd; 138 139 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 140 if (!pmd) 141 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 142 __func__, PAGE_SIZE, PAGE_SIZE); 143 pud_populate(&init_mm, pud, pmd); 144 BUG_ON(pmd != pmd_offset(pud, 0)); 145 } 146 147 return pmd_offset(pud, 0); 148 } 149 150 static pte_t * __init one_page_table_init(pmd_t *pmd) 151 { 152 if (pmd_none(*pmd)) { 153 pte_t *pte; 154 155 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 156 if (!pte) 157 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 158 __func__, PAGE_SIZE, PAGE_SIZE); 159 pmd_populate_kernel(&init_mm, pmd, pte); 160 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 161 } 162 163 return pte_offset_kernel(pmd, 0); 164 } 165 166 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 167 unsigned long vaddr, pte_t *lastpte) 168 { 169 return pte; 170 } 171 172 void __init page_table_range_init(unsigned long start, unsigned long end, 173 pgd_t *pgd_base) 174 { 175 pgd_t *pgd; 176 pud_t *pud; 177 pmd_t *pmd; 178 pte_t *pte = NULL; 179 int i, j, k; 180 unsigned long vaddr; 181 182 vaddr = start; 183 i = pgd_index(vaddr); 184 j = pud_index(vaddr); 185 k = pmd_index(vaddr); 186 pgd = pgd_base + i; 187 188 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 189 pud = (pud_t *)pgd; 190 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 191 pmd = one_md_table_init(pud); 192 #ifndef __PAGETABLE_PMD_FOLDED 193 pmd += k; 194 #endif 195 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 196 pte = page_table_kmap_check(one_page_table_init(pmd), 197 pmd, vaddr, pte); 198 vaddr += PMD_SIZE; 199 } 200 k = 0; 201 } 202 j = 0; 203 } 204 } 205 #endif /* CONFIG_MMU */ 206 207 void __init allocate_pgdat(unsigned int nid) 208 { 209 unsigned long start_pfn, end_pfn; 210 211 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 212 213 #ifdef CONFIG_NEED_MULTIPLE_NODES 214 NODE_DATA(nid) = memblock_alloc_try_nid( 215 sizeof(struct pglist_data), 216 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT, 217 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 218 if (!NODE_DATA(nid)) 219 panic("Can't allocate pgdat for node %d\n", nid); 220 #endif 221 222 NODE_DATA(nid)->node_start_pfn = start_pfn; 223 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 224 } 225 226 static void __init do_init_bootmem(void) 227 { 228 struct memblock_region *reg; 229 230 /* Add active regions with valid PFNs. */ 231 for_each_memblock(memory, reg) { 232 unsigned long start_pfn, end_pfn; 233 start_pfn = memblock_region_memory_base_pfn(reg); 234 end_pfn = memblock_region_memory_end_pfn(reg); 235 __add_active_range(0, start_pfn, end_pfn); 236 } 237 238 /* All of system RAM sits in node 0 for the non-NUMA case */ 239 allocate_pgdat(0); 240 node_set_online(0); 241 242 plat_mem_setup(); 243 244 sparse_init(); 245 } 246 247 static void __init early_reserve_mem(void) 248 { 249 unsigned long start_pfn; 250 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 251 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 252 253 /* 254 * Partially used pages are not usable - thus 255 * we are rounding upwards: 256 */ 257 start_pfn = PFN_UP(__pa(_end)); 258 259 /* 260 * Reserve the kernel text and Reserve the bootmem bitmap. We do 261 * this in two steps (first step was init_bootmem()), because 262 * this catches the (definitely buggy) case of us accidentally 263 * initializing the bootmem allocator with an invalid RAM area. 264 */ 265 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 266 267 /* 268 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 269 */ 270 if (CONFIG_ZERO_PAGE_OFFSET != 0) 271 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 272 273 /* 274 * Handle additional early reservations 275 */ 276 check_for_initrd(); 277 reserve_crashkernel(); 278 } 279 280 void __init paging_init(void) 281 { 282 unsigned long max_zone_pfns[MAX_NR_ZONES]; 283 unsigned long vaddr, end; 284 285 sh_mv.mv_mem_init(); 286 287 early_reserve_mem(); 288 289 /* 290 * Once the early reservations are out of the way, give the 291 * platforms a chance to kick out some memory. 292 */ 293 if (sh_mv.mv_mem_reserve) 294 sh_mv.mv_mem_reserve(); 295 296 memblock_enforce_memory_limit(memory_limit); 297 memblock_allow_resize(); 298 299 memblock_dump_all(); 300 301 /* 302 * Determine low and high memory ranges: 303 */ 304 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 305 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 306 307 nodes_clear(node_online_map); 308 309 memory_start = (unsigned long)__va(__MEMORY_START); 310 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 311 312 uncached_init(); 313 pmb_init(); 314 do_init_bootmem(); 315 ioremap_fixed_init(); 316 317 /* We don't need to map the kernel through the TLB, as 318 * it is permanatly mapped using P1. So clear the 319 * entire pgd. */ 320 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 321 322 /* Set an initial value for the MMU.TTB so we don't have to 323 * check for a null value. */ 324 set_TTB(swapper_pg_dir); 325 326 /* 327 * Populate the relevant portions of swapper_pg_dir so that 328 * we can use the fixmap entries without calling kmalloc. 329 * pte's will be filled in by __set_fixmap(). 330 */ 331 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 332 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 333 page_table_range_init(vaddr, end, swapper_pg_dir); 334 335 kmap_coherent_init(); 336 337 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 338 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 339 free_area_init(max_zone_pfns); 340 } 341 342 unsigned int mem_init_done = 0; 343 344 void __init mem_init(void) 345 { 346 pg_data_t *pgdat; 347 348 high_memory = NULL; 349 for_each_online_pgdat(pgdat) 350 high_memory = max_t(void *, high_memory, 351 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 352 353 memblock_free_all(); 354 355 /* Set this up early, so we can take care of the zero page */ 356 cpu_cache_init(); 357 358 /* clear the zero-page */ 359 memset(empty_zero_page, 0, PAGE_SIZE); 360 __flush_wback_region(empty_zero_page, PAGE_SIZE); 361 362 vsyscall_init(); 363 364 mem_init_print_info(NULL); 365 pr_info("virtual kernel memory layout:\n" 366 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 367 #ifdef CONFIG_HIGHMEM 368 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 369 #endif 370 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 371 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 372 #ifdef CONFIG_UNCACHED_MAPPING 373 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 374 #endif 375 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 376 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 377 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 378 FIXADDR_START, FIXADDR_TOP, 379 (FIXADDR_TOP - FIXADDR_START) >> 10, 380 381 #ifdef CONFIG_HIGHMEM 382 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 383 (LAST_PKMAP*PAGE_SIZE) >> 10, 384 #endif 385 386 (unsigned long)VMALLOC_START, VMALLOC_END, 387 (VMALLOC_END - VMALLOC_START) >> 20, 388 389 (unsigned long)memory_start, (unsigned long)high_memory, 390 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 391 392 #ifdef CONFIG_UNCACHED_MAPPING 393 uncached_start, uncached_end, uncached_size >> 20, 394 #endif 395 396 (unsigned long)&__init_begin, (unsigned long)&__init_end, 397 ((unsigned long)&__init_end - 398 (unsigned long)&__init_begin) >> 10, 399 400 (unsigned long)&_etext, (unsigned long)&_edata, 401 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 402 403 (unsigned long)&_text, (unsigned long)&_etext, 404 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 405 406 mem_init_done = 1; 407 } 408 409 #ifdef CONFIG_MEMORY_HOTPLUG 410 int arch_add_memory(int nid, u64 start, u64 size, 411 struct mhp_params *params) 412 { 413 unsigned long start_pfn = PFN_DOWN(start); 414 unsigned long nr_pages = size >> PAGE_SHIFT; 415 int ret; 416 417 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)) 418 return -EINVAL; 419 420 /* We only have ZONE_NORMAL, so this is easy.. */ 421 ret = __add_pages(nid, start_pfn, nr_pages, params); 422 if (unlikely(ret)) 423 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 424 425 return ret; 426 } 427 428 void arch_remove_memory(int nid, u64 start, u64 size, 429 struct vmem_altmap *altmap) 430 { 431 unsigned long start_pfn = PFN_DOWN(start); 432 unsigned long nr_pages = size >> PAGE_SHIFT; 433 434 __remove_pages(start_pfn, nr_pages, altmap); 435 } 436 #endif /* CONFIG_MEMORY_HOTPLUG */ 437