LXR linux/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
  34pgd_t swapper_pg_dir[PTRS_PER_PGD];
  35
  36void __init generic_mem_init(void)
  37{
  38        memblock_add(__MEMORY_START, __MEMORY_SIZE);
  39}
  40
  41void __init __weak plat_mem_setup(void)
  42{
  43        /* Nothing to see here, move along. */
  44}
  45
  46#ifdef CONFIG_MMU
  47static 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
  81static 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
  98static 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
 111void __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
 123void __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
 135static 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
 151static 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
 167static 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
 173void __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
 208void __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        NODE_DATA(nid) = memblock_alloc_try_nid(
 216                                sizeof(struct pglist_data),
 217                                SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
 218                                MEMBLOCK_ALLOC_ACCESSIBLE, nid);
 219        if (!NODE_DATA(nid))
 220                panic("Can't allocate pgdat for node %d\n", nid);
 221#endif
 222
 223        NODE_DATA(nid)->node_start_pfn = start_pfn;
 224        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 225}
 226
 227static void __init do_init_bootmem(void)
 228{
 229        unsigned long start_pfn, end_pfn;
 230        int i;
 231
 232        /* Add active regions with valid PFNs. */
 233        for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL)
 234                __add_active_range(0, start_pfn, end_pfn);
 235
 236        /* All of system RAM sits in node 0 for the non-NUMA case */
 237        allocate_pgdat(0);
 238        node_set_online(0);
 239
 240        plat_mem_setup();
 241
 242        sparse_init();
 243}
 244
 245static 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
 278void __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(max_zone_pfns);
 338}
 339
 340unsigned int mem_init_done = 0;
 341
 342void __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        pr_info("virtual kernel memory layout:\n"
 363                "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 364                "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 365                "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 366#ifdef CONFIG_UNCACHED_MAPPING
 367                "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 368#endif
 369                "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 370                "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 371                "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 372                FIXADDR_START, FIXADDR_TOP,
 373                (FIXADDR_TOP - FIXADDR_START) >> 10,
 374
 375                (unsigned long)VMALLOC_START, VMALLOC_END,
 376                (VMALLOC_END - VMALLOC_START) >> 20,
 377
 378                (unsigned long)memory_start, (unsigned long)high_memory,
 379                ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 380
 381#ifdef CONFIG_UNCACHED_MAPPING
 382                uncached_start, uncached_end, uncached_size >> 20,
 383#endif
 384
 385                (unsigned long)&__init_begin, (unsigned long)&__init_end,
 386                ((unsigned long)&__init_end -
 387                 (unsigned long)&__init_begin) >> 10,
 388
 389                (unsigned long)&_etext, (unsigned long)&_edata,
 390                ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 391
 392                (unsigned long)&_text, (unsigned long)&_etext,
 393                ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 394
 395        mem_init_done = 1;
 396}
 397
 398#ifdef CONFIG_MEMORY_HOTPLUG
 399int arch_add_memory(int nid, u64 start, u64 size,
 400                    struct mhp_params *params)
 401{
 402        unsigned long start_pfn = PFN_DOWN(start);
 403        unsigned long nr_pages = size >> PAGE_SHIFT;
 404        int ret;
 405
 406        if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
 407                return -EINVAL;
 408
 409        /* We only have ZONE_NORMAL, so this is easy.. */
 410        ret = __add_pages(nid, start_pfn, nr_pages, params);
 411        if (unlikely(ret))
 412                printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 413
 414        return ret;
 415}
 416
 417void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
 418{
 419        unsigned long start_pfn = PFN_DOWN(start);
 420        unsigned long nr_pages = size >> PAGE_SHIFT;
 421
 422        __remove_pages(start_pfn, nr_pages, altmap);
 423}
 424#endif /* CONFIG_MEMORY_HOTPLUG */
 425