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         mem_init_print_info(NULL);
 106         print_vm_layout();
 107 }
 108
 109 void __init setup_bootmem(void)
 110 {
 111         phys_addr_t mem_start = 0;
 112         phys_addr_t start, end = 0;
 113         phys_addr_t vmlinux_end = __pa_symbol(&_end);
 114         phys_addr_t vmlinux_start = __pa_symbol(&_start);
 115         u64 i;
 116
 117         /* Find the memory region containing the kernel */
 118         for_each_mem_range(i, &start, &end) {
 119                 phys_addr_t size = end - start;
 120                 if (!mem_start)
 121                         mem_start = start;
 122                 if (start <= vmlinux_start && vmlinux_end <= end)
 123                         BUG_ON(size == 0);
 124         }
 125
 126         /*
 127          * The maximal physical memory size is -PAGE_OFFSET.
 128          * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
 129          * as it is unusable by kernel.
 130          */
 131         memblock_enforce_memory_limit(-PAGE_OFFSET);
 132
 133         /* Reserve from the start of the kernel to the end of the kernel */
 134         memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
 135
 136         max_pfn = PFN_DOWN(memblock_end_of_DRAM());
 137         max_low_pfn = max_pfn;
 138         dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
 139         set_max_mapnr(max_low_pfn);
 140
 141         reserve_initrd_mem();
 142         /*
 143          * If DTB is built in, no need to reserve its memblock.
 144          * Otherwise, do reserve it but avoid using
 145          * early_init_fdt_reserve_self() since __pa() does
 146          * not work for DTB pointers that are fixmap addresses
 147          */
 148         if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
 149                 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
 150
 151         early_init_fdt_scan_reserved_mem();
 152         dma_contiguous_reserve(dma32_phys_limit);
 153         memblock_allow_resize();
 154 }
 155
 156 #ifdef CONFIG_MMU
 157 static struct pt_alloc_ops pt_ops;
 158
 159 unsigned long va_pa_offset;
 160 EXPORT_SYMBOL(va_pa_offset);
 161 unsigned long pfn_base;
 162 EXPORT_SYMBOL(pfn_base);
 163
 164 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 165 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 166 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
 167
 168 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
 169
 170 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
 171 {
 172         unsigned long addr = __fix_to_virt(idx);
 173         pte_t *ptep;
 174
 175         BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
 176
 177         ptep = &fixmap_pte[pte_index(addr)];
 178
 179         if (pgprot_val(prot))
 180                 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
 181         else
 182                 pte_clear(&init_mm, addr, ptep);
 183         local_flush_tlb_page(addr);
 184 }
 185
 186 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
 187 {
 188         return (pte_t *)((uintptr_t)pa);
 189 }
 190
 191 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
 192 {
 193         clear_fixmap(FIX_PTE);
 194         return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
 195 }
 196
 197 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
 198 {
 199         return (pte_t *) __va(pa);
 200 }
 201
 202 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
 203 {
 204         /*
 205          * We only create PMD or PGD early mappings so we
 206          * should never reach here with MMU disabled.
 207          */
 208         BUG();
 209 }
 210
 211 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
 212 {
 213         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 214 }
 215
 216 static phys_addr_t alloc_pte_late(uintptr_t va)
 217 {
 218         unsigned long vaddr;
 219
 220         vaddr = __get_free_page(GFP_KERNEL);
 221         if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
 222                 BUG();
 223         return __pa(vaddr);
 224 }
 225
 226 static void __init create_pte_mapping(pte_t *ptep,
 227                                       uintptr_t va, phys_addr_t pa,
 228                                       phys_addr_t sz, pgprot_t prot)
 229 {
 230         uintptr_t pte_idx = pte_index(va);
 231
 232         BUG_ON(sz != PAGE_SIZE);
 233
 234         if (pte_none(ptep[pte_idx]))
 235                 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
 236 }
 237
 238 #ifndef __PAGETABLE_PMD_FOLDED
 239
 240 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
 241 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
 242 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 243 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 244
 245 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
 246 {
 247         /* Before MMU is enabled */
 248         return (pmd_t *)((uintptr_t)pa);
 249 }
 250
 251 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
 252 {
 253         clear_fixmap(FIX_PMD);
 254         return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
 255 }
 256
 257 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
 258 {
 259         return (pmd_t *) __va(pa);
 260 }
 261
 262 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
 263 {
 264         BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
 265
 266         return (uintptr_t)early_pmd;
 267 }
 268
 269 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
 270 {
 271         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 272 }
 273
 274 static phys_addr_t alloc_pmd_late(uintptr_t va)
 275 {
 276         unsigned long vaddr;
 277
 278         vaddr = __get_free_page(GFP_KERNEL);
 279         BUG_ON(!vaddr);
 280         return __pa(vaddr);
 281 }
 282
 283 static void __init create_pmd_mapping(pmd_t *pmdp,
 284                                       uintptr_t va, phys_addr_t pa,
 285                                       phys_addr_t sz, pgprot_t prot)
 286 {
 287         pte_t *ptep;
 288         phys_addr_t pte_phys;
 289         uintptr_t pmd_idx = pmd_index(va);
 290
 291         if (sz == PMD_SIZE) {
 292                 if (pmd_none(pmdp[pmd_idx]))
 293                         pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
 294                 return;
 295         }
 296
 297         if (pmd_none(pmdp[pmd_idx])) {
 298                 pte_phys = pt_ops.alloc_pte(va);
 299                 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
 300                 ptep = pt_ops.get_pte_virt(pte_phys);
 301                 memset(ptep, 0, PAGE_SIZE);
 302         } else {
 303                 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
 304                 ptep = pt_ops.get_pte_virt(pte_phys);
 305         }
 306
 307         create_pte_mapping(ptep, va, pa, sz, prot);
 308 }
 309
 310 #define pgd_next_t              pmd_t
 311 #define alloc_pgd_next(__va)    pt_ops.alloc_pmd(__va)
 312 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
 313 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 314         create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
 315 #define fixmap_pgd_next         fixmap_pmd
 316 #else
 317 #define pgd_next_t              pte_t
 318 #define alloc_pgd_next(__va)    pt_ops.alloc_pte(__va)
 319 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
 320 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 321         create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
 322 #define fixmap_pgd_next         fixmap_pte
 323 #endif
 324
 325 void __init create_pgd_mapping(pgd_t *pgdp,
 326                                       uintptr_t va, phys_addr_t pa,
 327                                       phys_addr_t sz, pgprot_t prot)
 328 {
 329         pgd_next_t *nextp;
 330         phys_addr_t next_phys;
 331         uintptr_t pgd_idx = pgd_index(va);
 332
 333         if (sz == PGDIR_SIZE) {
 334                 if (pgd_val(pgdp[pgd_idx]) == 0)
 335                         pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
 336                 return;
 337         }
 338
 339         if (pgd_val(pgdp[pgd_idx]) == 0) {
 340                 next_phys = alloc_pgd_next(va);
 341                 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
 342                 nextp = get_pgd_next_virt(next_phys);
 343                 memset(nextp, 0, PAGE_SIZE);
 344         } else {
 345                 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
 346                 nextp = get_pgd_next_virt(next_phys);
 347         }
 348
 349         create_pgd_next_mapping(nextp, va, pa, sz, prot);
 350 }
 351
 352 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
 353 {
 354         /* Upgrade to PMD_SIZE mappings whenever possible */
 355         if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
 356                 return PAGE_SIZE;
 357
 358         return PMD_SIZE;
 359 }
 360
 361 /*
 362  * setup_vm() is called from head.S with MMU-off.
 363  *
 364  * Following requirements should be honoured for setup_vm() to work
 365  * correctly:
 366  * 1) It should use PC-relative addressing for accessing kernel symbols.
 367  *    To achieve this we always use GCC cmodel=medany.
 368  * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
 369  *    so disable compiler instrumentation when FTRACE is enabled.
 370  *
 371  * Currently, the above requirements are honoured by using custom CFLAGS
 372  * for init.o in mm/Makefile.
 373  */
 374
 375 #ifndef __riscv_cmodel_medany
 376 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
 377 #endif
 378
 379 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 380 {
 381         uintptr_t va, pa, end_va;
 382         uintptr_t load_pa = (uintptr_t)(&_start);
 383         uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
 384         uintptr_t map_size;
 385 #ifndef __PAGETABLE_PMD_FOLDED
 386         pmd_t fix_bmap_spmd, fix_bmap_epmd;
 387 #endif
 388
 389         va_pa_offset = PAGE_OFFSET - load_pa;
 390         pfn_base = PFN_DOWN(load_pa);
 391
 392         /*
 393          * Enforce boot alignment requirements of RV32 and
 394          * RV64 by only allowing PMD or PGD mappings.
 395          */
 396         map_size = PMD_SIZE;
 397
 398         /* Sanity check alignment and size */
 399         BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
 400         BUG_ON((load_pa % map_size) != 0);
 401
 402         pt_ops.alloc_pte = alloc_pte_early;
 403         pt_ops.get_pte_virt = get_pte_virt_early;
 404 #ifndef __PAGETABLE_PMD_FOLDED
 405         pt_ops.alloc_pmd = alloc_pmd_early;
 406         pt_ops.get_pmd_virt = get_pmd_virt_early;
 407 #endif
 408         /* Setup early PGD for fixmap */
 409         create_pgd_mapping(early_pg_dir, FIXADDR_START,
 410                            (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
 411
 412 #ifndef __PAGETABLE_PMD_FOLDED
 413         /* Setup fixmap PMD */
 414         create_pmd_mapping(fixmap_pmd, FIXADDR_START,
 415                            (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
 416         /* Setup trampoline PGD and PMD */
 417         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 418                            (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
 419         create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
 420                            load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
 421 #else
 422         /* Setup trampoline PGD */
 423         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 424                            load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
 425 #endif
 426
 427         /*
 428          * Setup early PGD covering entire kernel which will allows
 429          * us to reach paging_init(). We map all memory banks later
 430          * in setup_vm_final() below.
 431          */
 432         end_va = PAGE_OFFSET + load_sz;
 433         for (va = PAGE_OFFSET; va < end_va; va += map_size)
 434                 create_pgd_mapping(early_pg_dir, va,
 435                                    load_pa + (va - PAGE_OFFSET),
 436                                    map_size, PAGE_KERNEL_EXEC);
 437
 438 #ifndef __PAGETABLE_PMD_FOLDED
 439         /* Setup early PMD for DTB */
 440         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 441                            (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
 442 #ifndef CONFIG_BUILTIN_DTB
 443         /* Create two consecutive PMD mappings for FDT early scan */
 444         pa = dtb_pa & ~(PMD_SIZE - 1);
 445         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
 446                            pa, PMD_SIZE, PAGE_KERNEL);
 447         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
 448                            pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
 449         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
 450 #else /* CONFIG_BUILTIN_DTB */
 451         dtb_early_va = __va(dtb_pa);
 452 #endif /* CONFIG_BUILTIN_DTB */
 453 #else
 454 #ifndef CONFIG_BUILTIN_DTB
 455         /* Create two consecutive PGD mappings for FDT early scan */
 456         pa = dtb_pa & ~(PGDIR_SIZE - 1);
 457         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 458                            pa, PGDIR_SIZE, PAGE_KERNEL);
 459         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
 460                            pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
 461         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
 462 #else /* CONFIG_BUILTIN_DTB */
 463         dtb_early_va = __va(dtb_pa);
 464 #endif /* CONFIG_BUILTIN_DTB */
 465 #endif
 466         dtb_early_pa = dtb_pa;
 467
 468         /*
 469          * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
 470          * range can not span multiple pmds.
 471          */
 472         BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
 473                      != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
 474
 475 #ifndef __PAGETABLE_PMD_FOLDED
 476         /*
 477          * Early ioremap fixmap is already created as it lies within first 2MB
 478          * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
 479          * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
 480          * the user if not.
 481          */
 482         fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
 483         fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
 484         if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
 485                 WARN_ON(1);
 486                 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
 487                         pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
 488                 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
 489                         fix_to_virt(FIX_BTMAP_BEGIN));
 490                 pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
 491                         fix_to_virt(FIX_BTMAP_END));
 492
 493                 pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
 494                 pr_warn("FIX_BTMAP_BEGIN:     %d\n", FIX_BTMAP_BEGIN);
 495         }
 496 #endif
 497 }
 498
 499 static void __init setup_vm_final(void)
 500 {
 501         uintptr_t va, map_size;
 502         phys_addr_t pa, start, end;
 503         u64 i;
 504
 505         /**
 506          * MMU is enabled at this point. But page table setup is not complete yet.
 507          * fixmap page table alloc functions should be used at this point
 508          */
 509         pt_ops.alloc_pte = alloc_pte_fixmap;
 510         pt_ops.get_pte_virt = get_pte_virt_fixmap;
 511 #ifndef __PAGETABLE_PMD_FOLDED
 512         pt_ops.alloc_pmd = alloc_pmd_fixmap;
 513         pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
 514 #endif
 515         /* Setup swapper PGD for fixmap */
 516         create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
 517                            __pa_symbol(fixmap_pgd_next),
 518                            PGDIR_SIZE, PAGE_TABLE);
 519
 520         /* Map all memory banks */
 521         for_each_mem_range(i, &start, &end) {
 522                 if (start >= end)
 523                         break;
 524                 if (start <= __pa(PAGE_OFFSET) &&
 525                     __pa(PAGE_OFFSET) < end)
 526                         start = __pa(PAGE_OFFSET);
 527
 528                 map_size = best_map_size(start, end - start);
 529                 for (pa = start; pa < end; pa += map_size) {
 530                         va = (uintptr_t)__va(pa);
 531                         create_pgd_mapping(swapper_pg_dir, va, pa,
 532                                            map_size, PAGE_KERNEL_EXEC);
 533                 }
 534         }
 535
 536         /* Clear fixmap PTE and PMD mappings */
 537         clear_fixmap(FIX_PTE);
 538         clear_fixmap(FIX_PMD);
 539
 540         /* Move to swapper page table */
 541         csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
 542         local_flush_tlb_all();
 543
 544         /* generic page allocation functions must be used to setup page table */
 545         pt_ops.alloc_pte = alloc_pte_late;
 546         pt_ops.get_pte_virt = get_pte_virt_late;
 547 #ifndef __PAGETABLE_PMD_FOLDED
 548         pt_ops.alloc_pmd = alloc_pmd_late;
 549         pt_ops.get_pmd_virt = get_pmd_virt_late;
 550 #endif
 551 }
 552 #else
 553 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 554 {
 555         dtb_early_va = (void *)dtb_pa;
 556         dtb_early_pa = dtb_pa;
 557 }
 558
 559 static inline void setup_vm_final(void)
 560 {
 561 }
 562 #endif /* CONFIG_MMU */
 563
 564 #ifdef CONFIG_STRICT_KERNEL_RWX
 565 void protect_kernel_text_data(void)
 566 {
 567         unsigned long text_start = (unsigned long)_start;
 568         unsigned long init_text_start = (unsigned long)__init_text_begin;
 569         unsigned long init_data_start = (unsigned long)__init_data_begin;
 570         unsigned long rodata_start = (unsigned long)__start_rodata;
 571         unsigned long data_start = (unsigned long)_data;
 572         unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
 573
 574         set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
 575         set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
 576         set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
 577         /* rodata section is marked readonly in mark_rodata_ro */
 578         set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 579         set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
 580 }
 581
 582 void mark_rodata_ro(void)
 583 {
 584         unsigned long rodata_start = (unsigned long)__start_rodata;
 585         unsigned long data_start = (unsigned long)_data;
 586
 587         set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 588
 589         debug_checkwx();
 590 }
 591 #endif
 592
 593 void __init paging_init(void)
 594 {
 595         setup_vm_final();
 596         setup_zero_page();
 597 }
 598
 599 void __init misc_mem_init(void)
 600 {
 601         arch_numa_init();
 602         sparse_init();
 603         zone_sizes_init();
 604         memblock_dump_all();
 605 }
 606
 607 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 608 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 609                                struct vmem_altmap *altmap)
 610 {
 611         return vmemmap_populate_basepages(start, end, node, NULL);
 612 }
 613 #endif