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_or_panic(PAGE_SIZE, PAGE_SIZE); 141 pud_populate(&init_mm, pud, pmd); 142 BUG_ON(pmd != pmd_offset(pud, 0)); 143 } 144 145 return pmd_offset(pud, 0); 146 } 147 148 static pte_t * __init one_page_table_init(pmd_t *pmd) 149 { 150 if (pmd_none(*pmd)) { 151 pte_t *pte; 152 153 pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 154 pmd_populate_kernel(&init_mm, pmd, pte); 155 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 156 } 157 158 return pte_offset_kernel(pmd, 0); 159 } 160 161 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 162 unsigned long vaddr, pte_t *lastpte) 163 { 164 return pte; 165 } 166 167 void __init page_table_range_init(unsigned long start, unsigned long end, 168 pgd_t *pgd_base) 169 { 170 pgd_t *pgd; 171 pud_t *pud; 172 pmd_t *pmd; 173 pte_t *pte = NULL; 174 int i, j, k; 175 unsigned long vaddr; 176 177 vaddr = start; 178 i = pgd_index(vaddr); 179 j = pud_index(vaddr); 180 k = pmd_index(vaddr); 181 pgd = pgd_base + i; 182 183 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 184 pud = (pud_t *)pgd; 185 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 186 pmd = one_md_table_init(pud); 187 #ifndef __PAGETABLE_PMD_FOLDED 188 pmd += k; 189 #endif 190 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 191 pte = page_table_kmap_check(one_page_table_init(pmd), 192 pmd, vaddr, pte); 193 vaddr += PMD_SIZE; 194 } 195 k = 0; 196 } 197 j = 0; 198 } 199 } 200 #endif /* CONFIG_MMU */ 201 202 void __init allocate_pgdat(unsigned int nid) 203 { 204 unsigned long start_pfn, end_pfn; 205 206 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 207 208 #ifdef CONFIG_NUMA 209 alloc_node_data(nid); 210 #endif 211 212 NODE_DATA(nid)->node_start_pfn = start_pfn; 213 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 214 } 215 216 static void __init do_init_bootmem(void) 217 { 218 unsigned long start_pfn, end_pfn; 219 int i; 220 221 /* Add active regions with valid PFNs. */ 222 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) 223 __add_active_range(0, start_pfn, end_pfn); 224 225 /* All of system RAM sits in node 0 for the non-NUMA case */ 226 allocate_pgdat(0); 227 node_set_online(0); 228 229 plat_mem_setup(); 230 231 sparse_init(); 232 } 233 234 static void __init early_reserve_mem(void) 235 { 236 unsigned long start_pfn; 237 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 238 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 239 240 /* 241 * Partially used pages are not usable - thus 242 * we are rounding upwards: 243 */ 244 start_pfn = PFN_UP(__pa(_end)); 245 246 /* 247 * Reserve the kernel text and Reserve the bootmem bitmap. We do 248 * this in two steps (first step was init_bootmem()), because 249 * this catches the (definitely buggy) case of us accidentally 250 * initializing the bootmem allocator with an invalid RAM area. 251 */ 252 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 253 254 /* 255 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 256 */ 257 if (CONFIG_ZERO_PAGE_OFFSET != 0) 258 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 259 260 /* 261 * Handle additional early reservations 262 */ 263 check_for_initrd(); 264 reserve_crashkernel(); 265 } 266 267 void __init paging_init(void) 268 { 269 unsigned long max_zone_pfns[MAX_NR_ZONES]; 270 unsigned long vaddr, end; 271 272 sh_mv.mv_mem_init(); 273 274 early_reserve_mem(); 275 276 /* 277 * Once the early reservations are out of the way, give the 278 * platforms a chance to kick out some memory. 279 */ 280 if (sh_mv.mv_mem_reserve) 281 sh_mv.mv_mem_reserve(); 282 283 memblock_enforce_memory_limit(memory_limit); 284 memblock_allow_resize(); 285 286 memblock_dump_all(); 287 288 /* 289 * Determine low and high memory ranges: 290 */ 291 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 292 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 293 set_max_mapnr(max_low_pfn - min_low_pfn); 294 295 nodes_clear(node_online_map); 296 297 memory_start = (unsigned long)__va(__MEMORY_START); 298 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 299 300 uncached_init(); 301 pmb_init(); 302 do_init_bootmem(); 303 ioremap_fixed_init(); 304 305 /* We don't need to map the kernel through the TLB, as 306 * it is permanatly mapped using P1. So clear the 307 * entire pgd. */ 308 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 309 310 /* Set an initial value for the MMU.TTB so we don't have to 311 * check for a null value. */ 312 set_TTB(swapper_pg_dir); 313 314 /* 315 * Populate the relevant portions of swapper_pg_dir so that 316 * we can use the fixmap entries without calling kmalloc. 317 * pte's will be filled in by __set_fixmap(). 318 */ 319 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 320 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 321 page_table_range_init(vaddr, end, swapper_pg_dir); 322 323 kmap_coherent_init(); 324 325 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 326 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 327 free_area_init(max_zone_pfns); 328 } 329 330 unsigned int mem_init_done = 0; 331 332 void __init mem_init(void) 333 { 334 pg_data_t *pgdat; 335 336 high_memory = NULL; 337 for_each_online_pgdat(pgdat) 338 high_memory = max_t(void *, high_memory, 339 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); 340 341 memblock_free_all(); 342 343 /* Set this up early, so we can take care of the zero page */ 344 cpu_cache_init(); 345 346 /* clear the zero-page */ 347 memset(empty_zero_page, 0, PAGE_SIZE); 348 __flush_wback_region(empty_zero_page, PAGE_SIZE); 349 350 vsyscall_init(); 351 352 pr_info("virtual kernel memory layout:\n" 353 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 354 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 355 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 356 #ifdef CONFIG_UNCACHED_MAPPING 357 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 358 #endif 359 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 360 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 361 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 362 FIXADDR_START, FIXADDR_TOP, 363 (FIXADDR_TOP - FIXADDR_START) >> 10, 364 365 (unsigned long)VMALLOC_START, VMALLOC_END, 366 (VMALLOC_END - VMALLOC_START) >> 20, 367 368 (unsigned long)memory_start, (unsigned long)high_memory, 369 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 370 371 #ifdef CONFIG_UNCACHED_MAPPING 372 uncached_start, uncached_end, uncached_size >> 20, 373 #endif 374 375 (unsigned long)&__init_begin, (unsigned long)&__init_end, 376 ((unsigned long)&__init_end - 377 (unsigned long)&__init_begin) >> 10, 378 379 (unsigned long)&_etext, (unsigned long)&_edata, 380 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 381 382 (unsigned long)&_text, (unsigned long)&_etext, 383 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 384 385 mem_init_done = 1; 386 } 387