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