arch/sh/mm/init.c

   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         alloc_node_data(nid);
 216 #endif
 217
 218         NODE_DATA(nid)->node_start_pfn = start_pfn;
 219         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 220 }
 221
 222 static void __init do_init_bootmem(void)
 223 {
 224         unsigned long start_pfn, end_pfn;
 225         int i;
 226
 227         /* Add active regions with valid PFNs. */
 228         for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL)
 229                 __add_active_range(0, start_pfn, end_pfn);
 230
 231         /* All of system RAM sits in node 0 for the non-NUMA case */
 232         allocate_pgdat(0);
 233         node_set_online(0);
 234
 235         plat_mem_setup();
 236
 237         sparse_init();
 238 }
 239
 240 static void __init early_reserve_mem(void)
 241 {
 242         unsigned long start_pfn;
 243         u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
 244         u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
 245
 246         /*
 247          * Partially used pages are not usable - thus
 248          * we are rounding upwards:
 249          */
 250         start_pfn = PFN_UP(__pa(_end));
 251
 252         /*
 253          * Reserve the kernel text and Reserve the bootmem bitmap. We do
 254          * this in two steps (first step was init_bootmem()), because
 255          * this catches the (definitely buggy) case of us accidentally
 256          * initializing the bootmem allocator with an invalid RAM area.
 257          */
 258         memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
 259
 260         /*
 261          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 262          */
 263         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 264                 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
 265
 266         /*
 267          * Handle additional early reservations
 268          */
 269         check_for_initrd();
 270         reserve_crashkernel();
 271 }
 272
 273 void __init paging_init(void)
 274 {
 275         unsigned long max_zone_pfns[MAX_NR_ZONES];
 276         unsigned long vaddr, end;
 277
 278         sh_mv.mv_mem_init();
 279
 280         early_reserve_mem();
 281
 282         /*
 283          * Once the early reservations are out of the way, give the
 284          * platforms a chance to kick out some memory.
 285          */
 286         if (sh_mv.mv_mem_reserve)
 287                 sh_mv.mv_mem_reserve();
 288
 289         memblock_enforce_memory_limit(memory_limit);
 290         memblock_allow_resize();
 291
 292         memblock_dump_all();
 293
 294         /*
 295          * Determine low and high memory ranges:
 296          */
 297         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
 298         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 299         set_max_mapnr(max_low_pfn - min_low_pfn);
 300
 301         nodes_clear(node_online_map);
 302
 303         memory_start = (unsigned long)__va(__MEMORY_START);
 304         memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
 305
 306         uncached_init();
 307         pmb_init();
 308         do_init_bootmem();
 309         ioremap_fixed_init();
 310
 311         /* We don't need to map the kernel through the TLB, as
 312          * it is permanatly mapped using P1. So clear the
 313          * entire pgd. */
 314         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 315
 316         /* Set an initial value for the MMU.TTB so we don't have to
 317          * check for a null value. */
 318         set_TTB(swapper_pg_dir);
 319
 320         /*
 321          * Populate the relevant portions of swapper_pg_dir so that
 322          * we can use the fixmap entries without calling kmalloc.
 323          * pte's will be filled in by __set_fixmap().
 324          */
 325         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 326         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 327         page_table_range_init(vaddr, end, swapper_pg_dir);
 328
 329         kmap_coherent_init();
 330
 331         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 332         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 333         free_area_init(max_zone_pfns);
 334 }
 335
 336 unsigned int mem_init_done = 0;
 337
 338 void __init mem_init(void)
 339 {
 340         pg_data_t *pgdat;
 341
 342         high_memory = NULL;
 343         for_each_online_pgdat(pgdat)
 344                 high_memory = max_t(void *, high_memory,
 345                                     __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
 346
 347         memblock_free_all();
 348
 349         /* Set this up early, so we can take care of the zero page */
 350         cpu_cache_init();
 351
 352         /* clear the zero-page */
 353         memset(empty_zero_page, 0, PAGE_SIZE);
 354         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 355
 356         vsyscall_init();
 357
 358         pr_info("virtual kernel memory layout:\n"
 359                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 360                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 361                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 362 #ifdef CONFIG_UNCACHED_MAPPING
 363                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 364 #endif
 365                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 366                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 367                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 368                 FIXADDR_START, FIXADDR_TOP,
 369                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 370
 371                 (unsigned long)VMALLOC_START, VMALLOC_END,
 372                 (VMALLOC_END - VMALLOC_START) >> 20,
 373
 374                 (unsigned long)memory_start, (unsigned long)high_memory,
 375                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 376
 377 #ifdef CONFIG_UNCACHED_MAPPING
 378                 uncached_start, uncached_end, uncached_size >> 20,
 379 #endif
 380
 381                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 382                 ((unsigned long)&__init_end -
 383                  (unsigned long)&__init_begin) >> 10,
 384
 385                 (unsigned long)&_etext, (unsigned long)&_edata,
 386                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 387
 388                 (unsigned long)&_text, (unsigned long)&_etext,
 389                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 390
 391         mem_init_done = 1;
 392 }