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 #include "ioremap.h" 33 34 pgd_t swapper_pg_dir[PTRS_PER_PGD]; 35 36 void __init generic_mem_init(void) 37 { 38 memblock_add(__MEMORY_START, __MEMORY_SIZE); 39 } 40 41 void __init __weak plat_mem_setup(void) 42 { 43 /* Nothing to see here, move along. */ 44 } 45 46 #ifdef CONFIG_MMU 47 static pte_t *__get_pte_phys(unsigned long addr) 48 { 49 pgd_t *pgd; 50 p4d_t *p4d; 51 pud_t *pud; 52 pmd_t *pmd; 53 54 pgd = pgd_offset_k(addr); 55 if (pgd_none(*pgd)) { 56 pgd_ERROR(*pgd); 57 return NULL; 58 } 59 60 p4d = p4d_alloc(NULL, pgd, addr); 61 if (unlikely(!p4d)) { 62 p4d_ERROR(*p4d); 63 return NULL; 64 } 65 66 pud = pud_alloc(NULL, p4d, addr); 67 if (unlikely(!pud)) { 68 pud_ERROR(*pud); 69 return NULL; 70 } 71 72 pmd = pmd_alloc(NULL, pud, addr); 73 if (unlikely(!pmd)) { 74 pmd_ERROR(*pmd); 75 return NULL; 76 } 77 78 return pte_offset_kernel(pmd, addr); 79 } 80 81 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 82 { 83 pte_t *pte; 84 85 pte = __get_pte_phys(addr); 86 if (!pte_none(*pte)) { 87 pte_ERROR(*pte); 88 return; 89 } 90 91 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 92 local_flush_tlb_one(get_asid(), addr); 93 94 if (pgprot_val(prot) & _PAGE_WIRED) 95 tlb_wire_entry(NULL, addr, *pte); 96 } 97 98 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 99 { 100 pte_t *pte; 101 102 pte = __get_pte_phys(addr); 103 104 if (pgprot_val(prot) & _PAGE_WIRED) 105 tlb_unwire_entry(); 106 107 set_pte(pte, pfn_pte(0, __pgprot(0))); 108 local_flush_tlb_one(get_asid(), addr); 109 } 110 111 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 112 { 113 unsigned long address = __fix_to_virt(idx); 114 115 if (idx >= __end_of_fixed_addresses) { 116 BUG(); 117 return; 118 } 119 120 set_pte_phys(address, phys, prot); 121 } 122 123 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 124 { 125 unsigned long address = __fix_to_virt(idx); 126 127 if (idx >= __end_of_fixed_addresses) { 128 BUG(); 129 return; 130 } 131 132 clear_pte_phys(address, prot); 133 } 134 135 static pmd_t * __init one_md_table_init(pud_t *pud) 136 { 137 if (pud_none(*pud)) { 138 pmd_t *pmd; 139 140 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 141 if (!pmd) 142 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 143 __func__, PAGE_SIZE, PAGE_SIZE); 144 pud_populate(&init_mm, pud, pmd); 145 BUG_ON(pmd != pmd_offset(pud, 0)); 146 } 147 148 return pmd_offset(pud, 0); 149 } 150 151 static pte_t * __init one_page_table_init(pmd_t *pmd) 152 { 153 if (pmd_none(*pmd)) { 154 pte_t *pte; 155 156 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 157 if (!pte) 158 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 159 __func__, PAGE_SIZE, PAGE_SIZE); 160 pmd_populate_kernel(&init_mm, pmd, pte); 161 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 162 } 163 164 return pte_offset_kernel(pmd, 0); 165 } 166 167 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 168 unsigned long vaddr, pte_t *lastpte) 169 { 170 return pte; 171 } 172 173 void __init page_table_range_init(unsigned long start, unsigned long end, 174 pgd_t *pgd_base) 175 { 176 pgd_t *pgd; 177 pud_t *pud; 178 pmd_t *pmd; 179 pte_t *pte = NULL; 180 int i, j, k; 181 unsigned long vaddr; 182 183 vaddr = start; 184 i = pgd_index(vaddr); 185 j = pud_index(vaddr); 186 k = pmd_index(vaddr); 187 pgd = pgd_base + i; 188 189 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 190 pud = (pud_t *)pgd; 191 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 192 pmd = one_md_table_init(pud); 193 #ifndef __PAGETABLE_PMD_FOLDED 194 pmd += k; 195 #endif 196 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 197 pte = page_table_kmap_check(one_page_table_init(pmd), 198 pmd, vaddr, pte); 199 vaddr += PMD_SIZE; 200 } 201 k = 0; 202 } 203 j = 0; 204 } 205 } 206 #endif /* CONFIG_MMU */ 207 208 void __init allocate_pgdat(unsigned int nid) 209 { 210 unsigned long start_pfn, end_pfn; 211 212 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 213 214 #ifdef CONFIG_NUMA 215 NODE_DATA(nid) = memblock_alloc_try_nid( 216 sizeof(struct pglist_data), 217 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT, 218 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 219 if (!NODE_DATA(nid)) 220 panic("Can't allocate pgdat for node %d\n", nid); 221 #endif 222 223 NODE_DATA(nid)->node_start_pfn = start_pfn; 224 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 225 } 226 227 static void __init do_init_bootmem(void) 228 { 229 unsigned long start_pfn, end_pfn; 230 int i; 231 232 /* Add active regions with valid PFNs. */ 233 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) 234 __add_active_range(0, start_pfn, end_pfn); 235 236 /* All of system RAM sits in node 0 for the non-NUMA case */ 237 allocate_pgdat(0); 238 node_set_online(0); 239 240 plat_mem_setup(); 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(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 pr_info("virtual kernel memory layout:\n" 363 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 364 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 365 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 366 #ifdef CONFIG_UNCACHED_MAPPING 367 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 368 #endif 369 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 370 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 371 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 372 FIXADDR_START, FIXADDR_TOP, 373 (FIXADDR_TOP - FIXADDR_START) >> 10, 374 375 (unsigned long)VMALLOC_START, VMALLOC_END, 376 (VMALLOC_END - VMALLOC_START) >> 20, 377 378 (unsigned long)memory_start, (unsigned long)high_memory, 379 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 380 381 #ifdef CONFIG_UNCACHED_MAPPING 382 uncached_start, uncached_end, uncached_size >> 20, 383 #endif 384 385 (unsigned long)&__init_begin, (unsigned long)&__init_end, 386 ((unsigned long)&__init_end - 387 (unsigned long)&__init_begin) >> 10, 388 389 (unsigned long)&_etext, (unsigned long)&_edata, 390 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 391 392 (unsigned long)&_text, (unsigned long)&_etext, 393 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 394 395 mem_init_done = 1; 396 } 397 398 #ifdef CONFIG_MEMORY_HOTPLUG 399 int arch_add_memory(int nid, u64 start, u64 size, 400 struct mhp_params *params) 401 { 402 unsigned long start_pfn = PFN_DOWN(start); 403 unsigned long nr_pages = size >> PAGE_SHIFT; 404 int ret; 405 406 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot)) 407 return -EINVAL; 408 409 /* We only have ZONE_NORMAL, so this is easy.. */ 410 ret = __add_pages(nid, start_pfn, nr_pages, params); 411 if (unlikely(ret)) 412 printk("%s: Failed, __add_pages() == %d\n", __func__, ret); 413 414 return ret; 415 } 416 417 void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 418 { 419 unsigned long start_pfn = PFN_DOWN(start); 420 unsigned long nr_pages = size >> PAGE_SHIFT; 421 422 __remove_pages(start_pfn, nr_pages, altmap); 423 } 424 #endif /* CONFIG_MEMORY_HOTPLUG */ 425