arch/sh/mm/init.c

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This source file includes following definitions.
generic_mem_init
plat_mem_setup
__get_pte_phys
set_pte_phys
clear_pte_phys
__set_fixmap
__clear_fixmap
one_md_table_init
one_page_table_init
page_table_kmap_check
page_table_range_init
allocate_pgdat
do_init_bootmem
early_reserve_mem
paging_init
mem_init
arch_add_memory
memory_add_physaddr_to_nid
arch_remove_memory
   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 <linux/sizes.h>
  31 
  32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
  33 
  34 void __init generic_mem_init(void)
  35 {
  36         memblock_add(__MEMORY_START, __MEMORY_SIZE);
  37 }
  38 
  39 void __init __weak plat_mem_setup(void)
  40 {
  41         /* Nothing to see here, move along. */
  42 }
  43 
  44 #ifdef CONFIG_MMU
  45 static pte_t *__get_pte_phys(unsigned long addr)
  46 {
  47         pgd_t *pgd;
  48         pud_t *pud;
  49         pmd_t *pmd;
  50 
  51         pgd = pgd_offset_k(addr);
  52         if (pgd_none(*pgd)) {
  53                 pgd_ERROR(*pgd);
  54                 return NULL;
  55         }
  56 
  57         pud = pud_alloc(NULL, pgd, addr);
  58         if (unlikely(!pud)) {
  59                 pud_ERROR(*pud);
  60                 return NULL;
  61         }
  62 
  63         pmd = pmd_alloc(NULL, pud, addr);
  64         if (unlikely(!pmd)) {
  65                 pmd_ERROR(*pmd);
  66                 return NULL;
  67         }
  68 
  69         return pte_offset_kernel(pmd, addr);
  70 }
  71 
  72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  73 {
  74         pte_t *pte;
  75 
  76         pte = __get_pte_phys(addr);
  77         if (!pte_none(*pte)) {
  78                 pte_ERROR(*pte);
  79                 return;
  80         }
  81 
  82         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  83         local_flush_tlb_one(get_asid(), addr);
  84 
  85         if (pgprot_val(prot) & _PAGE_WIRED)
  86                 tlb_wire_entry(NULL, addr, *pte);
  87 }
  88 
  89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  90 {
  91         pte_t *pte;
  92 
  93         pte = __get_pte_phys(addr);
  94 
  95         if (pgprot_val(prot) & _PAGE_WIRED)
  96                 tlb_unwire_entry();
  97 
  98         set_pte(pte, pfn_pte(0, __pgprot(0)));
  99         local_flush_tlb_one(get_asid(), addr);
 100 }
 101 
 102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 103 {
 104         unsigned long address = __fix_to_virt(idx);
 105 
 106         if (idx >= __end_of_fixed_addresses) {
 107                 BUG();
 108                 return;
 109         }
 110 
 111         set_pte_phys(address, phys, prot);
 112 }
 113 
 114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 115 {
 116         unsigned long address = __fix_to_virt(idx);
 117 
 118         if (idx >= __end_of_fixed_addresses) {
 119                 BUG();
 120                 return;
 121         }
 122 
 123         clear_pte_phys(address, prot);
 124 }
 125 
 126 static pmd_t * __init one_md_table_init(pud_t *pud)
 127 {
 128         if (pud_none(*pud)) {
 129                 pmd_t *pmd;
 130 
 131                 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 132                 if (!pmd)
 133                         panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 134                               __func__, PAGE_SIZE, PAGE_SIZE);
 135                 pud_populate(&init_mm, pud, pmd);
 136                 BUG_ON(pmd != pmd_offset(pud, 0));
 137         }
 138 
 139         return pmd_offset(pud, 0);
 140 }
 141 
 142 static pte_t * __init one_page_table_init(pmd_t *pmd)
 143 {
 144         if (pmd_none(*pmd)) {
 145                 pte_t *pte;
 146 
 147                 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 148                 if (!pte)
 149                         panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 150                               __func__, PAGE_SIZE, PAGE_SIZE);
 151                 pmd_populate_kernel(&init_mm, pmd, pte);
 152                 BUG_ON(pte != pte_offset_kernel(pmd, 0));
 153         }
 154 
 155         return pte_offset_kernel(pmd, 0);
 156 }
 157 
 158 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
 159                                             unsigned long vaddr, pte_t *lastpte)
 160 {
 161         return pte;
 162 }
 163 
 164 void __init page_table_range_init(unsigned long start, unsigned long end,
 165                                          pgd_t *pgd_base)
 166 {
 167         pgd_t *pgd;
 168         pud_t *pud;
 169         pmd_t *pmd;
 170         pte_t *pte = NULL;
 171         int i, j, k;
 172         unsigned long vaddr;
 173 
 174         vaddr = start;
 175         i = __pgd_offset(vaddr);
 176         j = __pud_offset(vaddr);
 177         k = __pmd_offset(vaddr);
 178         pgd = pgd_base + i;
 179 
 180         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 181                 pud = (pud_t *)pgd;
 182                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 183                         pmd = one_md_table_init(pud);
 184 #ifndef __PAGETABLE_PMD_FOLDED
 185                         pmd += k;
 186 #endif
 187                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 188                                 pte = page_table_kmap_check(one_page_table_init(pmd),
 189                                                             pmd, vaddr, pte);
 190                                 vaddr += PMD_SIZE;
 191                         }
 192                         k = 0;
 193                 }
 194                 j = 0;
 195         }
 196 }
 197 #endif  /* CONFIG_MMU */
 198 
 199 void __init allocate_pgdat(unsigned int nid)
 200 {
 201         unsigned long start_pfn, end_pfn;
 202 
 203         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 204 
 205 #ifdef CONFIG_NEED_MULTIPLE_NODES
 206         NODE_DATA(nid) = memblock_alloc_try_nid(
 207                                 sizeof(struct pglist_data),
 208                                 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
 209                                 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 210         if (!NODE_DATA(nid))
 211                 panic("Can't allocate pgdat for node %d\n", 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         struct memblock_region *reg;
 221 
 222         /* Add active regions with valid PFNs. */
 223         for_each_memblock(memory, reg) {
 224                 unsigned long start_pfn, end_pfn;
 225                 start_pfn = memblock_region_memory_base_pfn(reg);
 226                 end_pfn = memblock_region_memory_end_pfn(reg);
 227                 __add_active_range(0, start_pfn, end_pfn);
 228         }
 229 
 230         /* All of system RAM sits in node 0 for the non-NUMA case */
 231         allocate_pgdat(0);
 232         node_set_online(0);
 233 
 234         plat_mem_setup();
 235 
 236         for_each_memblock(memory, reg) {
 237                 int nid = memblock_get_region_node(reg);
 238 
 239                 memory_present(nid, memblock_region_memory_base_pfn(reg),
 240                         memblock_region_memory_end_pfn(reg));
 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_nodes(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         mem_init_print_info(NULL);
 363         pr_info("virtual kernel memory layout:\n"
 364                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 365 #ifdef CONFIG_HIGHMEM
 366                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 367 #endif
 368                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 369                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 370 #ifdef CONFIG_UNCACHED_MAPPING
 371                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 372 #endif
 373                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 374                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 375                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 376                 FIXADDR_START, FIXADDR_TOP,
 377                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 378 
 379 #ifdef CONFIG_HIGHMEM
 380                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 381                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 382 #endif
 383 
 384                 (unsigned long)VMALLOC_START, VMALLOC_END,
 385                 (VMALLOC_END - VMALLOC_START) >> 20,
 386 
 387                 (unsigned long)memory_start, (unsigned long)high_memory,
 388                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 389 
 390 #ifdef CONFIG_UNCACHED_MAPPING
 391                 uncached_start, uncached_end, uncached_size >> 20,
 392 #endif
 393 
 394                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 395                 ((unsigned long)&__init_end -
 396                  (unsigned long)&__init_begin) >> 10,
 397 
 398                 (unsigned long)&_etext, (unsigned long)&_edata,
 399                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 400 
 401                 (unsigned long)&_text, (unsigned long)&_etext,
 402                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 403 
 404         mem_init_done = 1;
 405 }
 406 
 407 #ifdef CONFIG_MEMORY_HOTPLUG
 408 int arch_add_memory(int nid, u64 start, u64 size,
 409                         struct mhp_restrictions *restrictions)
 410 {
 411         unsigned long start_pfn = PFN_DOWN(start);
 412         unsigned long nr_pages = size >> PAGE_SHIFT;
 413         int ret;
 414 
 415         /* We only have ZONE_NORMAL, so this is easy.. */
 416         ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
 417         if (unlikely(ret))
 418                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 419 
 420         return ret;
 421 }
 422 
 423 #ifdef CONFIG_NUMA
 424 int memory_add_physaddr_to_nid(u64 addr)
 425 {
 426         /* Node 0 for now.. */
 427         return 0;
 428 }
 429 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 430 #endif
 431 
 432 void arch_remove_memory(int nid, u64 start, u64 size,
 433                         struct vmem_altmap *altmap)
 434 {
 435         unsigned long start_pfn = PFN_DOWN(start);
 436         unsigned long nr_pages = size >> PAGE_SHIFT;
 437 
 438         __remove_pages(start_pfn, nr_pages, altmap);
 439 }
 440 #endif /* CONFIG_MEMORY_HOTPLUG */
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root/arch/sh/mm/init.c

DEFINITIONS
