arch/riscv/mm/init.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  * Copyright (C) 2019 Western Digital Corporation or its affiliates.
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/mm.h>
   9 #include <linux/memblock.h>
  10 #include <linux/initrd.h>
  11 #include <linux/swap.h>
  12 #include <linux/sizes.h>
  13 #include <linux/of_fdt.h>
  14 #include <linux/libfdt.h>
  15 #include <linux/set_memory.h>
  16 #include <linux/dma-map-ops.h>
  17
  18 #include <asm/fixmap.h>
  19 #include <asm/tlbflush.h>
  20 #include <asm/sections.h>
  21 #include <asm/soc.h>
  22 #include <asm/io.h>
  23 #include <asm/ptdump.h>
  24 #include <asm/numa.h>
  25
  26 #include "../kernel/head.h"
  27
  28 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
  29                                                         __page_aligned_bss;
  30 EXPORT_SYMBOL(empty_zero_page);
  31
  32 extern char _start[];
  33 #define DTB_EARLY_BASE_VA      PGDIR_SIZE
  34 void *dtb_early_va __initdata;
  35 uintptr_t dtb_early_pa __initdata;
  36
  37 struct pt_alloc_ops {
  38         pte_t *(*get_pte_virt)(phys_addr_t pa);
  39         phys_addr_t (*alloc_pte)(uintptr_t va);
  40 #ifndef __PAGETABLE_PMD_FOLDED
  41         pmd_t *(*get_pmd_virt)(phys_addr_t pa);
  42         phys_addr_t (*alloc_pmd)(uintptr_t va);
  43 #endif
  44 };
  45
  46 static phys_addr_t dma32_phys_limit __ro_after_init;
  47
  48 static void __init zone_sizes_init(void)
  49 {
  50         unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
  51
  52 #ifdef CONFIG_ZONE_DMA32
  53         max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
  54 #endif
  55         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
  56
  57         free_area_init(max_zone_pfns);
  58 }
  59
  60 static void setup_zero_page(void)
  61 {
  62         memset((void *)empty_zero_page, 0, PAGE_SIZE);
  63 }
  64
  65 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
  66 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
  67 {
  68         pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld kB)\n", name, b, t,
  69                   (((t) - (b)) >> 10));
  70 }
  71
  72 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
  73 {
  74         pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld MB)\n", name, b, t,
  75                   (((t) - (b)) >> 20));
  76 }
  77
  78 static void print_vm_layout(void)
  79 {
  80         pr_notice("Virtual kernel memory layout:\n");
  81         print_mlk("fixmap", (unsigned long)FIXADDR_START,
  82                   (unsigned long)FIXADDR_TOP);
  83         print_mlm("pci io", (unsigned long)PCI_IO_START,
  84                   (unsigned long)PCI_IO_END);
  85         print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
  86                   (unsigned long)VMEMMAP_END);
  87         print_mlm("vmalloc", (unsigned long)VMALLOC_START,
  88                   (unsigned long)VMALLOC_END);
  89         print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
  90                   (unsigned long)high_memory);
  91 }
  92 #else
  93 static void print_vm_layout(void) { }
  94 #endif /* CONFIG_DEBUG_VM */
  95
  96 void __init mem_init(void)
  97 {
  98 #ifdef CONFIG_FLATMEM
  99         BUG_ON(!mem_map);
 100 #endif /* CONFIG_FLATMEM */
 101
 102         high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
 103         memblock_free_all();
 104
 105         print_vm_layout();
 106 }
 107
 108 void __init setup_bootmem(void)
 109 {
 110         phys_addr_t vmlinux_end = __pa_symbol(&_end);
 111         phys_addr_t vmlinux_start = __pa_symbol(&_start);
 112         phys_addr_t dram_end = memblock_end_of_DRAM();
 113         phys_addr_t max_mapped_addr = __pa(~(ulong)0);
 114
 115         /* The maximal physical memory size is -PAGE_OFFSET. */
 116         memblock_enforce_memory_limit(-PAGE_OFFSET);
 117
 118         /* Reserve from the start of the kernel to the end of the kernel */
 119         memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
 120
 121         /*
 122          * memblock allocator is not aware of the fact that last 4K bytes of
 123          * the addressable memory can not be mapped because of IS_ERR_VALUE
 124          * macro. Make sure that last 4k bytes are not usable by memblock
 125          * if end of dram is equal to maximum addressable memory.
 126          */
 127         if (max_mapped_addr == (dram_end - 1))
 128                 memblock_set_current_limit(max_mapped_addr - 4096);
 129
 130         max_pfn = PFN_DOWN(dram_end);
 131         max_low_pfn = max_pfn;
 132         dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
 133         set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
 134
 135         reserve_initrd_mem();
 136         /*
 137          * If DTB is built in, no need to reserve its memblock.
 138          * Otherwise, do reserve it but avoid using
 139          * early_init_fdt_reserve_self() since __pa() does
 140          * not work for DTB pointers that are fixmap addresses
 141          */
 142         if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
 143                 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
 144
 145         early_init_fdt_scan_reserved_mem();
 146         dma_contiguous_reserve(dma32_phys_limit);
 147         memblock_allow_resize();
 148 }
 149
 150 #ifdef CONFIG_MMU
 151 static struct pt_alloc_ops pt_ops;
 152
 153 unsigned long va_pa_offset;
 154 EXPORT_SYMBOL(va_pa_offset);
 155 unsigned long pfn_base;
 156 EXPORT_SYMBOL(pfn_base);
 157
 158 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 159 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 160 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
 161
 162 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
 163
 164 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
 165 {
 166         unsigned long addr = __fix_to_virt(idx);
 167         pte_t *ptep;
 168
 169         BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
 170
 171         ptep = &fixmap_pte[pte_index(addr)];
 172
 173         if (pgprot_val(prot))
 174                 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
 175         else
 176                 pte_clear(&init_mm, addr, ptep);
 177         local_flush_tlb_page(addr);
 178 }
 179
 180 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
 181 {
 182         return (pte_t *)((uintptr_t)pa);
 183 }
 184
 185 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
 186 {
 187         clear_fixmap(FIX_PTE);
 188         return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
 189 }
 190
 191 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
 192 {
 193         return (pte_t *) __va(pa);
 194 }
 195
 196 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
 197 {
 198         /*
 199          * We only create PMD or PGD early mappings so we
 200          * should never reach here with MMU disabled.
 201          */
 202         BUG();
 203 }
 204
 205 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
 206 {
 207         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 208 }
 209
 210 static phys_addr_t alloc_pte_late(uintptr_t va)
 211 {
 212         unsigned long vaddr;
 213
 214         vaddr = __get_free_page(GFP_KERNEL);
 215         if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
 216                 BUG();
 217         return __pa(vaddr);
 218 }
 219
 220 static void __init create_pte_mapping(pte_t *ptep,
 221                                       uintptr_t va, phys_addr_t pa,
 222                                       phys_addr_t sz, pgprot_t prot)
 223 {
 224         uintptr_t pte_idx = pte_index(va);
 225
 226         BUG_ON(sz != PAGE_SIZE);
 227
 228         if (pte_none(ptep[pte_idx]))
 229                 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
 230 }
 231
 232 #ifndef __PAGETABLE_PMD_FOLDED
 233
 234 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
 235 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
 236 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 237 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 238
 239 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
 240 {
 241         /* Before MMU is enabled */
 242         return (pmd_t *)((uintptr_t)pa);
 243 }
 244
 245 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
 246 {
 247         clear_fixmap(FIX_PMD);
 248         return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
 249 }
 250
 251 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
 252 {
 253         return (pmd_t *) __va(pa);
 254 }
 255
 256 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
 257 {
 258         BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
 259
 260         return (uintptr_t)early_pmd;
 261 }
 262
 263 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
 264 {
 265         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 266 }
 267
 268 static phys_addr_t alloc_pmd_late(uintptr_t va)
 269 {
 270         unsigned long vaddr;
 271
 272         vaddr = __get_free_page(GFP_KERNEL);
 273         BUG_ON(!vaddr);
 274         return __pa(vaddr);
 275 }
 276
 277 static void __init create_pmd_mapping(pmd_t *pmdp,
 278                                       uintptr_t va, phys_addr_t pa,
 279                                       phys_addr_t sz, pgprot_t prot)
 280 {
 281         pte_t *ptep;
 282         phys_addr_t pte_phys;
 283         uintptr_t pmd_idx = pmd_index(va);
 284
 285         if (sz == PMD_SIZE) {
 286                 if (pmd_none(pmdp[pmd_idx]))
 287                         pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
 288                 return;
 289         }
 290
 291         if (pmd_none(pmdp[pmd_idx])) {
 292                 pte_phys = pt_ops.alloc_pte(va);
 293                 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
 294                 ptep = pt_ops.get_pte_virt(pte_phys);
 295                 memset(ptep, 0, PAGE_SIZE);
 296         } else {
 297                 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
 298                 ptep = pt_ops.get_pte_virt(pte_phys);
 299         }
 300
 301         create_pte_mapping(ptep, va, pa, sz, prot);
 302 }
 303
 304 #define pgd_next_t              pmd_t
 305 #define alloc_pgd_next(__va)    pt_ops.alloc_pmd(__va)
 306 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
 307 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 308         create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
 309 #define fixmap_pgd_next         fixmap_pmd
 310 #else
 311 #define pgd_next_t              pte_t
 312 #define alloc_pgd_next(__va)    pt_ops.alloc_pte(__va)
 313 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
 314 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 315         create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
 316 #define fixmap_pgd_next         fixmap_pte
 317 #endif
 318
 319 void __init create_pgd_mapping(pgd_t *pgdp,
 320                                       uintptr_t va, phys_addr_t pa,
 321                                       phys_addr_t sz, pgprot_t prot)
 322 {
 323         pgd_next_t *nextp;
 324         phys_addr_t next_phys;
 325         uintptr_t pgd_idx = pgd_index(va);
 326
 327         if (sz == PGDIR_SIZE) {
 328                 if (pgd_val(pgdp[pgd_idx]) == 0)
 329                         pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
 330                 return;
 331         }
 332
 333         if (pgd_val(pgdp[pgd_idx]) == 0) {
 334                 next_phys = alloc_pgd_next(va);
 335                 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
 336                 nextp = get_pgd_next_virt(next_phys);
 337                 memset(nextp, 0, PAGE_SIZE);
 338         } else {
 339                 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
 340                 nextp = get_pgd_next_virt(next_phys);
 341         }
 342
 343         create_pgd_next_mapping(nextp, va, pa, sz, prot);
 344 }
 345
 346 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
 347 {
 348         /* Upgrade to PMD_SIZE mappings whenever possible */
 349         if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
 350                 return PAGE_SIZE;
 351
 352         return PMD_SIZE;
 353 }
 354
 355 /*
 356  * setup_vm() is called from head.S with MMU-off.
 357  *
 358  * Following requirements should be honoured for setup_vm() to work
 359  * correctly:
 360  * 1) It should use PC-relative addressing for accessing kernel symbols.
 361  *    To achieve this we always use GCC cmodel=medany.
 362  * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
 363  *    so disable compiler instrumentation when FTRACE is enabled.
 364  *
 365  * Currently, the above requirements are honoured by using custom CFLAGS
 366  * for init.o in mm/Makefile.
 367  */
 368
 369 #ifndef __riscv_cmodel_medany
 370 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
 371 #endif
 372
 373 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 374 {
 375         uintptr_t va, pa, end_va;
 376         uintptr_t load_pa = (uintptr_t)(&_start);
 377         uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
 378         uintptr_t map_size;
 379 #ifndef __PAGETABLE_PMD_FOLDED
 380         pmd_t fix_bmap_spmd, fix_bmap_epmd;
 381 #endif
 382
 383         va_pa_offset = PAGE_OFFSET - load_pa;
 384         pfn_base = PFN_DOWN(load_pa);
 385
 386         /*
 387          * Enforce boot alignment requirements of RV32 and
 388          * RV64 by only allowing PMD or PGD mappings.
 389          */
 390         map_size = PMD_SIZE;
 391
 392         /* Sanity check alignment and size */
 393         BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
 394         BUG_ON((load_pa % map_size) != 0);
 395
 396         pt_ops.alloc_pte = alloc_pte_early;
 397         pt_ops.get_pte_virt = get_pte_virt_early;
 398 #ifndef __PAGETABLE_PMD_FOLDED
 399         pt_ops.alloc_pmd = alloc_pmd_early;
 400         pt_ops.get_pmd_virt = get_pmd_virt_early;
 401 #endif
 402         /* Setup early PGD for fixmap */
 403         create_pgd_mapping(early_pg_dir, FIXADDR_START,
 404                            (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
 405
 406 #ifndef __PAGETABLE_PMD_FOLDED
 407         /* Setup fixmap PMD */
 408         create_pmd_mapping(fixmap_pmd, FIXADDR_START,
 409                            (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
 410         /* Setup trampoline PGD and PMD */
 411         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 412                            (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
 413         create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
 414                            load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
 415 #else
 416         /* Setup trampoline PGD */
 417         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 418                            load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
 419 #endif
 420
 421         /*
 422          * Setup early PGD covering entire kernel which will allows
 423          * us to reach paging_init(). We map all memory banks later
 424          * in setup_vm_final() below.
 425          */
 426         end_va = PAGE_OFFSET + load_sz;
 427         for (va = PAGE_OFFSET; va < end_va; va += map_size)
 428                 create_pgd_mapping(early_pg_dir, va,
 429                                    load_pa + (va - PAGE_OFFSET),
 430                                    map_size, PAGE_KERNEL_EXEC);
 431
 432 #ifndef __PAGETABLE_PMD_FOLDED
 433         /* Setup early PMD for DTB */
 434         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 435                            (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
 436 #ifndef CONFIG_BUILTIN_DTB
 437         /* Create two consecutive PMD mappings for FDT early scan */
 438         pa = dtb_pa & ~(PMD_SIZE - 1);
 439         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
 440                            pa, PMD_SIZE, PAGE_KERNEL);
 441         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
 442                            pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
 443         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
 444 #else /* CONFIG_BUILTIN_DTB */
 445         dtb_early_va = __va(dtb_pa);
 446 #endif /* CONFIG_BUILTIN_DTB */
 447 #else
 448 #ifndef CONFIG_BUILTIN_DTB
 449         /* Create two consecutive PGD mappings for FDT early scan */
 450         pa = dtb_pa & ~(PGDIR_SIZE - 1);
 451         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 452                            pa, PGDIR_SIZE, PAGE_KERNEL);
 453         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
 454                            pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
 455         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
 456 #else /* CONFIG_BUILTIN_DTB */
 457         dtb_early_va = __va(dtb_pa);
 458 #endif /* CONFIG_BUILTIN_DTB */
 459 #endif
 460         dtb_early_pa = dtb_pa;
 461
 462         /*
 463          * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
 464          * range can not span multiple pmds.
 465          */
 466         BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
 467                      != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
 468
 469 #ifndef __PAGETABLE_PMD_FOLDED
 470         /*
 471          * Early ioremap fixmap is already created as it lies within first 2MB
 472          * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
 473          * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
 474          * the user if not.
 475          */
 476         fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
 477         fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
 478         if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
 479                 WARN_ON(1);
 480                 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
 481                         pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
 482                 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
 483                         fix_to_virt(FIX_BTMAP_BEGIN));
 484                 pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
 485                         fix_to_virt(FIX_BTMAP_END));
 486
 487                 pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
 488                 pr_warn("FIX_BTMAP_BEGIN:     %d\n", FIX_BTMAP_BEGIN);
 489         }
 490 #endif
 491 }
 492
 493 static void __init setup_vm_final(void)
 494 {
 495         uintptr_t va, map_size;
 496         phys_addr_t pa, start, end;
 497         u64 i;
 498
 499         /**
 500          * MMU is enabled at this point. But page table setup is not complete yet.
 501          * fixmap page table alloc functions should be used at this point
 502          */
 503         pt_ops.alloc_pte = alloc_pte_fixmap;
 504         pt_ops.get_pte_virt = get_pte_virt_fixmap;
 505 #ifndef __PAGETABLE_PMD_FOLDED
 506         pt_ops.alloc_pmd = alloc_pmd_fixmap;
 507         pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
 508 #endif
 509         /* Setup swapper PGD for fixmap */
 510         create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
 511                            __pa_symbol(fixmap_pgd_next),
 512                            PGDIR_SIZE, PAGE_TABLE);
 513
 514         /* Map all memory banks */
 515         for_each_mem_range(i, &start, &end) {
 516                 if (start >= end)
 517                         break;
 518                 if (start <= __pa(PAGE_OFFSET) &&
 519                     __pa(PAGE_OFFSET) < end)
 520                         start = __pa(PAGE_OFFSET);
 521
 522                 map_size = best_map_size(start, end - start);
 523                 for (pa = start; pa < end; pa += map_size) {
 524                         va = (uintptr_t)__va(pa);
 525                         create_pgd_mapping(swapper_pg_dir, va, pa,
 526                                            map_size, PAGE_KERNEL_EXEC);
 527                 }
 528         }
 529
 530         /* Clear fixmap PTE and PMD mappings */
 531         clear_fixmap(FIX_PTE);
 532         clear_fixmap(FIX_PMD);
 533
 534         /* Move to swapper page table */
 535         csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
 536         local_flush_tlb_all();
 537
 538         /* generic page allocation functions must be used to setup page table */
 539         pt_ops.alloc_pte = alloc_pte_late;
 540         pt_ops.get_pte_virt = get_pte_virt_late;
 541 #ifndef __PAGETABLE_PMD_FOLDED
 542         pt_ops.alloc_pmd = alloc_pmd_late;
 543         pt_ops.get_pmd_virt = get_pmd_virt_late;
 544 #endif
 545 }
 546 #else
 547 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 548 {
 549         dtb_early_va = (void *)dtb_pa;
 550         dtb_early_pa = dtb_pa;
 551 }
 552
 553 static inline void setup_vm_final(void)
 554 {
 555 }
 556 #endif /* CONFIG_MMU */
 557
 558 #ifdef CONFIG_STRICT_KERNEL_RWX
 559 void protect_kernel_text_data(void)
 560 {
 561         unsigned long text_start = (unsigned long)_start;
 562         unsigned long init_text_start = (unsigned long)__init_text_begin;
 563         unsigned long init_data_start = (unsigned long)__init_data_begin;
 564         unsigned long rodata_start = (unsigned long)__start_rodata;
 565         unsigned long data_start = (unsigned long)_data;
 566         unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
 567
 568         set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
 569         set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
 570         set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
 571         /* rodata section is marked readonly in mark_rodata_ro */
 572         set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 573         set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
 574 }
 575
 576 void mark_rodata_ro(void)
 577 {
 578         unsigned long rodata_start = (unsigned long)__start_rodata;
 579         unsigned long data_start = (unsigned long)_data;
 580
 581         set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 582
 583         debug_checkwx();
 584 }
 585 #endif
 586
 587 void __init paging_init(void)
 588 {
 589         setup_vm_final();
 590         setup_zero_page();
 591 }
 592
 593 void __init misc_mem_init(void)
 594 {
 595         arch_numa_init();
 596         sparse_init();
 597         zone_sizes_init();
 598         memblock_dump_all();
 599 }
 600
 601 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 602 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 603                                struct vmem_altmap *altmap)
 604 {
 605         return vmemmap_populate_basepages(start, end, node, NULL);
 606 }
 607 #endif