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 } 231 232 static void __init early_reserve_mem(void) 233 { 234 unsigned long start_pfn; 235 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; 236 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; 237 238 /* 239 * Partially used pages are not usable - thus 240 * we are rounding upwards: 241 */ 242 start_pfn = PFN_UP(__pa(_end)); 243 244 /* 245 * Reserve the kernel text and Reserve the bootmem bitmap. We do 246 * this in two steps (first step was init_bootmem()), because 247 * this catches the (definitely buggy) case of us accidentally 248 * initializing the bootmem allocator with an invalid RAM area. 249 */ 250 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); 251 252 /* 253 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. 254 */ 255 if (CONFIG_ZERO_PAGE_OFFSET != 0) 256 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); 257 258 /* 259 * Handle additional early reservations 260 */ 261 check_for_initrd(); 262 reserve_crashkernel(); 263 } 264 265 void __init arch_zone_limits_init(unsigned long *max_zone_pfns) 266 { 267 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 268 } 269 270 void __init paging_init(void) 271 { 272 unsigned long vaddr, end; 273 274 sh_mv.mv_mem_init(); 275 276 early_reserve_mem(); 277 278 /* 279 * Once the early reservations are out of the way, give the 280 * platforms a chance to kick out some memory. 281 */ 282 if (sh_mv.mv_mem_reserve) 283 sh_mv.mv_mem_reserve(); 284 285 memblock_enforce_memory_limit(memory_limit); 286 memblock_allow_resize(); 287 288 memblock_dump_all(); 289 290 /* 291 * Determine low and high memory ranges: 292 */ 293 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 294 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 295 296 nodes_clear(node_online_map); 297 298 memory_start = (unsigned long)__va(__MEMORY_START); 299 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 300 301 uncached_init(); 302 pmb_init(); 303 do_init_bootmem(); 304 ioremap_fixed_init(); 305 306 /* We don't need to map the kernel through the TLB, as 307 * it is permanatly mapped using P1. So clear the 308 * entire pgd. */ 309 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 310 311 /* Set an initial value for the MMU.TTB so we don't have to 312 * check for a null value. */ 313 set_TTB(swapper_pg_dir); 314 315 /* 316 * Populate the relevant portions of swapper_pg_dir so that 317 * we can use the fixmap entries without calling kmalloc. 318 * pte's will be filled in by __set_fixmap(). 319 */ 320 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 321 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 322 page_table_range_init(vaddr, end, swapper_pg_dir); 323 324 kmap_coherent_init(); 325 } 326 327 unsigned int mem_init_done = 0; 328 329 void __init mem_init(void) 330 { 331 /* Set this up early, so we can take care of the zero page */ 332 cpu_cache_init(); 333 334 /* clear the zero-page */ 335 memset(empty_zero_page, 0, PAGE_SIZE); 336 __flush_wback_region(empty_zero_page, PAGE_SIZE); 337 338 vsyscall_init(); 339 340 pr_info("virtual kernel memory layout:\n" 341 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 342 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 343 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 344 #ifdef CONFIG_UNCACHED_MAPPING 345 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 346 #endif 347 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 348 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 349 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 350 FIXADDR_START, FIXADDR_TOP, 351 (FIXADDR_TOP - FIXADDR_START) >> 10, 352 353 (unsigned long)VMALLOC_START, VMALLOC_END, 354 (VMALLOC_END - VMALLOC_START) >> 20, 355 356 (unsigned long)memory_start, (unsigned long)high_memory, 357 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 358 359 #ifdef CONFIG_UNCACHED_MAPPING 360 uncached_start, uncached_end, uncached_size >> 20, 361 #endif 362 363 (unsigned long)&__init_begin, (unsigned long)&__init_end, 364 ((unsigned long)&__init_end - 365 (unsigned long)&__init_begin) >> 10, 366 367 (unsigned long)&_etext, (unsigned long)&_edata, 368 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 369 370 (unsigned long)&_text, (unsigned long)&_etext, 371 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 372 373 mem_init_done = 1; 374 } 375