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 return NULL; 57 58 p4d = p4d_alloc(NULL, pgd, addr); 59 if (unlikely(!p4d)) { 60 pr_err("allocating p4d table failed\n"); 61 return NULL; 62 } 63 64 pud = pud_alloc(NULL, p4d, addr); 65 if (unlikely(!pud)) { 66 pr_err("allocating pud table failed\n"); 67 return NULL; 68 } 69 70 pmd = pmd_alloc(NULL, pud, addr); 71 if (unlikely(!pmd)) { 72 pr_err("allocating pmd table failed\n"); 73 return NULL; 74 } 75 76 return pte_offset_kernel(pmd, addr); 77 } 78 79 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) 80 { 81 pte_t *pte; 82 83 pte = __get_pte_phys(addr); 84 if (!pte_none(*pte)) { 85 char str[PTVAL_STR_MAX]; 86 87 ptval_to_str(str, pte_val(*pte)); 88 pr_err("unexpected set PTE at %lx in %s: bad pte %p(%s).\n", 89 addr, __func__, pte, str); 90 return; 91 } 92 93 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); 94 local_flush_tlb_one(get_asid(), addr); 95 96 if (pgprot_val(prot) & _PAGE_WIRED) 97 tlb_wire_entry(NULL, addr, *pte); 98 } 99 100 static void clear_pte_phys(unsigned long addr, pgprot_t prot) 101 { 102 pte_t *pte; 103 104 pte = __get_pte_phys(addr); 105 106 if (pgprot_val(prot) & _PAGE_WIRED) 107 tlb_unwire_entry(); 108 109 set_pte(pte, pfn_pte(0, __pgprot(0))); 110 local_flush_tlb_one(get_asid(), addr); 111 } 112 113 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) 114 { 115 unsigned long address = __fix_to_virt(idx); 116 117 if (idx >= __end_of_fixed_addresses) { 118 BUG(); 119 return; 120 } 121 122 set_pte_phys(address, phys, prot); 123 } 124 125 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) 126 { 127 unsigned long address = __fix_to_virt(idx); 128 129 if (idx >= __end_of_fixed_addresses) { 130 BUG(); 131 return; 132 } 133 134 clear_pte_phys(address, prot); 135 } 136 137 static pmd_t * __init one_md_table_init(pud_t *pud) 138 { 139 if (pud_none(*pud)) { 140 pmd_t *pmd; 141 142 pmd = memblock_alloc_or_panic(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_or_panic(PAGE_SIZE, PAGE_SIZE); 156 pmd_populate_kernel(&init_mm, pmd, pte); 157 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 158 } 159 160 return pte_offset_kernel(pmd, 0); 161 } 162 163 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, 164 unsigned long vaddr, pte_t *lastpte) 165 { 166 return pte; 167 } 168 169 void __init page_table_range_init(unsigned long start, unsigned long end, 170 pgd_t *pgd_base) 171 { 172 pgd_t *pgd; 173 pud_t *pud; 174 pmd_t *pmd; 175 pte_t *pte = NULL; 176 int i, j, k; 177 unsigned long vaddr; 178 179 vaddr = start; 180 i = pgd_index(vaddr); 181 j = pud_index(vaddr); 182 k = pmd_index(vaddr); 183 pgd = pgd_base + i; 184 185 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { 186 pud = (pud_t *)pgd; 187 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { 188 pmd = one_md_table_init(pud); 189 #ifndef __PAGETABLE_PMD_FOLDED 190 pmd += k; 191 #endif 192 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { 193 pte = page_table_kmap_check(one_page_table_init(pmd), 194 pmd, vaddr, pte); 195 vaddr += PMD_SIZE; 196 } 197 k = 0; 198 } 199 j = 0; 200 } 201 } 202 #endif /* CONFIG_MMU */ 203 204 void __init allocate_pgdat(unsigned int nid) 205 { 206 unsigned long start_pfn, end_pfn; 207 208 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); 209 210 #ifdef CONFIG_NUMA 211 alloc_node_data(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 unsigned long start_pfn, end_pfn; 221 int i; 222 223 /* Add active regions with valid PFNs. */ 224 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) 225 __add_active_range(0, start_pfn, end_pfn); 226 227 /* All of system RAM sits in node 0 for the non-NUMA case */ 228 allocate_pgdat(0); 229 node_set_online(0); 230 231 plat_mem_setup(); 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 arch_zone_limits_init(unsigned long *max_zone_pfns) 268 { 269 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 270 } 271 272 void __init paging_init(void) 273 { 274 unsigned long vaddr, end; 275 276 sh_mv.mv_mem_init(); 277 278 early_reserve_mem(); 279 280 /* 281 * Once the early reservations are out of the way, give the 282 * platforms a chance to kick out some memory. 283 */ 284 if (sh_mv.mv_mem_reserve) 285 sh_mv.mv_mem_reserve(); 286 287 memblock_enforce_memory_limit(memory_limit); 288 memblock_allow_resize(); 289 290 memblock_dump_all(); 291 292 /* 293 * Determine low and high memory ranges: 294 */ 295 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; 296 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 297 298 nodes_clear(node_online_map); 299 300 memory_start = (unsigned long)__va(__MEMORY_START); 301 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); 302 303 uncached_init(); 304 pmb_init(); 305 do_init_bootmem(); 306 ioremap_fixed_init(); 307 308 /* We don't need to map the kernel through the TLB, as 309 * it is permanatly mapped using P1. So clear the 310 * entire pgd. */ 311 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); 312 313 /* Set an initial value for the MMU.TTB so we don't have to 314 * check for a null value. */ 315 set_TTB(swapper_pg_dir); 316 317 /* 318 * Populate the relevant portions of swapper_pg_dir so that 319 * we can use the fixmap entries without calling kmalloc. 320 * pte's will be filled in by __set_fixmap(). 321 */ 322 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 323 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; 324 page_table_range_init(vaddr, end, swapper_pg_dir); 325 326 kmap_coherent_init(); 327 } 328 329 unsigned int mem_init_done = 0; 330 331 void __init mem_init(void) 332 { 333 /* Set this up early, so we can take care of the zero page */ 334 cpu_cache_init(); 335 336 vsyscall_init(); 337 338 pr_info("virtual kernel memory layout:\n" 339 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 340 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 341 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" 342 #ifdef CONFIG_UNCACHED_MAPPING 343 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" 344 #endif 345 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" 346 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" 347 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", 348 FIXADDR_START, FIXADDR_TOP, 349 (FIXADDR_TOP - FIXADDR_START) >> 10, 350 351 (unsigned long)VMALLOC_START, VMALLOC_END, 352 (VMALLOC_END - VMALLOC_START) >> 20, 353 354 (unsigned long)memory_start, (unsigned long)high_memory, 355 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, 356 357 #ifdef CONFIG_UNCACHED_MAPPING 358 uncached_start, uncached_end, uncached_size >> 20, 359 #endif 360 361 (unsigned long)&__init_begin, (unsigned long)&__init_end, 362 ((unsigned long)&__init_end - 363 (unsigned long)&__init_begin) >> 10, 364 365 (unsigned long)&_etext, (unsigned long)&_edata, 366 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, 367 368 (unsigned long)&_text, (unsigned long)&_etext, 369 ((unsigned long)&_etext - (unsigned long)&_text) >> 10); 370 371 mem_init_done = 1; 372 } 373