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
  25 #include "../kernel/head.h"
  26
  27 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
  28                                                         __page_aligned_bss;
  29 EXPORT_SYMBOL(empty_zero_page);
  30
  31 extern char _start[];
  32 #define DTB_EARLY_BASE_VA      PGDIR_SIZE
  33 void *dtb_early_va __initdata;
  34 uintptr_t dtb_early_pa __initdata;
  35
  36 struct pt_alloc_ops {
  37         pte_t *(*get_pte_virt)(phys_addr_t pa);
  38         phys_addr_t (*alloc_pte)(uintptr_t va);
  39 #ifndef __PAGETABLE_PMD_FOLDED
  40         pmd_t *(*get_pmd_virt)(phys_addr_t pa);
  41         phys_addr_t (*alloc_pmd)(uintptr_t va);
  42 #endif
  43 };
  44
  45 static phys_addr_t dma32_phys_limit __ro_after_init;
  46
  47 static void __init zone_sizes_init(void)
  48 {
  49         unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
  50
  51 #ifdef CONFIG_ZONE_DMA32
  52         max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
  53 #endif
  54         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
  55
  56         free_area_init(max_zone_pfns);
  57 }
  58
  59 static void setup_zero_page(void)
  60 {
  61         memset((void *)empty_zero_page, 0, PAGE_SIZE);
  62 }
  63
  64 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
  65 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
  66 {
  67         pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld kB)\n", name, b, t,
  68                   (((t) - (b)) >> 10));
  69 }
  70
  71 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
  72 {
  73         pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld MB)\n", name, b, t,
  74                   (((t) - (b)) >> 20));
  75 }
  76
  77 static void print_vm_layout(void)
  78 {
  79         pr_notice("Virtual kernel memory layout:\n");
  80         print_mlk("fixmap", (unsigned long)FIXADDR_START,
  81                   (unsigned long)FIXADDR_TOP);
  82         print_mlm("pci io", (unsigned long)PCI_IO_START,
  83                   (unsigned long)PCI_IO_END);
  84         print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
  85                   (unsigned long)VMEMMAP_END);
  86         print_mlm("vmalloc", (unsigned long)VMALLOC_START,
  87                   (unsigned long)VMALLOC_END);
  88         print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
  89                   (unsigned long)high_memory);
  90 }
  91 #else
  92 static void print_vm_layout(void) { }
  93 #endif /* CONFIG_DEBUG_VM */
  94
  95 void __init mem_init(void)
  96 {
  97 #ifdef CONFIG_FLATMEM
  98         BUG_ON(!mem_map);
  99 #endif /* CONFIG_FLATMEM */
 100
 101         high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
 102         memblock_free_all();
 103
 104         mem_init_print_info(NULL);
 105         print_vm_layout();
 106 }
 107
 108 #ifdef CONFIG_BLK_DEV_INITRD
 109 static void __init setup_initrd(void)
 110 {
 111         phys_addr_t start;
 112         unsigned long size;
 113
 114         /* Ignore the virtul address computed during device tree parsing */
 115         initrd_start = initrd_end = 0;
 116
 117         if (!phys_initrd_size)
 118                 return;
 119         /*
 120          * Round the memory region to page boundaries as per free_initrd_mem()
 121          * This allows us to detect whether the pages overlapping the initrd
 122          * are in use, but more importantly, reserves the entire set of pages
 123          * as we don't want these pages allocated for other purposes.
 124          */
 125         start = round_down(phys_initrd_start, PAGE_SIZE);
 126         size = phys_initrd_size + (phys_initrd_start - start);
 127         size = round_up(size, PAGE_SIZE);
 128
 129         if (!memblock_is_region_memory(start, size)) {
 130                 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
 131                        (u64)start, size);
 132                 goto disable;
 133         }
 134
 135         if (memblock_is_region_reserved(start, size)) {
 136                 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
 137                        (u64)start, size);
 138                 goto disable;
 139         }
 140
 141         memblock_reserve(start, size);
 142         /* Now convert initrd to virtual addresses */
 143         initrd_start = (unsigned long)__va(phys_initrd_start);
 144         initrd_end = initrd_start + phys_initrd_size;
 145         initrd_below_start_ok = 1;
 146
 147         pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
 148                 (void *)(initrd_start), size);
 149         return;
 150 disable:
 151         pr_cont(" - disabling initrd\n");
 152         initrd_start = 0;
 153         initrd_end = 0;
 154 }
 155 #endif /* CONFIG_BLK_DEV_INITRD */
 156
 157 void __init setup_bootmem(void)
 158 {
 159         phys_addr_t mem_start = 0;
 160         phys_addr_t start, end = 0;
 161         phys_addr_t vmlinux_end = __pa_symbol(&_end);
 162         phys_addr_t vmlinux_start = __pa_symbol(&_start);
 163         u64 i;
 164
 165         /* Find the memory region containing the kernel */
 166         for_each_mem_range(i, &start, &end) {
 167                 phys_addr_t size = end - start;
 168                 if (!mem_start)
 169                         mem_start = start;
 170                 if (start <= vmlinux_start && vmlinux_end <= end)
 171                         BUG_ON(size == 0);
 172         }
 173
 174         /*
 175          * The maximal physical memory size is -PAGE_OFFSET.
 176          * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
 177          * as it is unusable by kernel.
 178          */
 179         memblock_enforce_memory_limit(-PAGE_OFFSET);
 180
 181         /* Reserve from the start of the kernel to the end of the kernel */
 182         memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
 183
 184         max_pfn = PFN_DOWN(memblock_end_of_DRAM());
 185         max_low_pfn = max_pfn;
 186         dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
 187         set_max_mapnr(max_low_pfn);
 188
 189 #ifdef CONFIG_BLK_DEV_INITRD
 190         setup_initrd();
 191 #endif /* CONFIG_BLK_DEV_INITRD */
 192
 193         /*
 194          * Avoid using early_init_fdt_reserve_self() since __pa() does
 195          * not work for DTB pointers that are fixmap addresses
 196          */
 197         memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
 198
 199         early_init_fdt_scan_reserved_mem();
 200         dma_contiguous_reserve(dma32_phys_limit);
 201         memblock_allow_resize();
 202         memblock_dump_all();
 203 }
 204
 205 #ifdef CONFIG_MMU
 206 static struct pt_alloc_ops pt_ops;
 207
 208 unsigned long va_pa_offset;
 209 EXPORT_SYMBOL(va_pa_offset);
 210 unsigned long pfn_base;
 211 EXPORT_SYMBOL(pfn_base);
 212
 213 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 214 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 215 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
 216
 217 #define MAX_EARLY_MAPPING_SIZE  SZ_128M
 218
 219 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
 220
 221 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
 222 {
 223         unsigned long addr = __fix_to_virt(idx);
 224         pte_t *ptep;
 225
 226         BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
 227
 228         ptep = &fixmap_pte[pte_index(addr)];
 229
 230         if (pgprot_val(prot))
 231                 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
 232         else
 233                 pte_clear(&init_mm, addr, ptep);
 234         local_flush_tlb_page(addr);
 235 }
 236
 237 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
 238 {
 239         return (pte_t *)((uintptr_t)pa);
 240 }
 241
 242 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
 243 {
 244         clear_fixmap(FIX_PTE);
 245         return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
 246 }
 247
 248 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
 249 {
 250         return (pte_t *) __va(pa);
 251 }
 252
 253 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
 254 {
 255         /*
 256          * We only create PMD or PGD early mappings so we
 257          * should never reach here with MMU disabled.
 258          */
 259         BUG();
 260 }
 261
 262 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
 263 {
 264         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 265 }
 266
 267 static phys_addr_t alloc_pte_late(uintptr_t va)
 268 {
 269         unsigned long vaddr;
 270
 271         vaddr = __get_free_page(GFP_KERNEL);
 272         if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
 273                 BUG();
 274         return __pa(vaddr);
 275 }
 276
 277 static void __init create_pte_mapping(pte_t *ptep,
 278                                       uintptr_t va, phys_addr_t pa,
 279                                       phys_addr_t sz, pgprot_t prot)
 280 {
 281         uintptr_t pte_idx = pte_index(va);
 282
 283         BUG_ON(sz != PAGE_SIZE);
 284
 285         if (pte_none(ptep[pte_idx]))
 286                 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
 287 }
 288
 289 #ifndef __PAGETABLE_PMD_FOLDED
 290
 291 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
 292 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
 293
 294 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
 295 #define NUM_EARLY_PMDS          1UL
 296 #else
 297 #define NUM_EARLY_PMDS          (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
 298 #endif
 299 pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
 300 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 301
 302 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
 303 {
 304         /* Before MMU is enabled */
 305         return (pmd_t *)((uintptr_t)pa);
 306 }
 307
 308 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
 309 {
 310         clear_fixmap(FIX_PMD);
 311         return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
 312 }
 313
 314 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
 315 {
 316         return (pmd_t *) __va(pa);
 317 }
 318
 319 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
 320 {
 321         uintptr_t pmd_num;
 322
 323         pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT;
 324         BUG_ON(pmd_num >= NUM_EARLY_PMDS);
 325         return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD];
 326 }
 327
 328 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
 329 {
 330         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 331 }
 332
 333 static phys_addr_t alloc_pmd_late(uintptr_t va)
 334 {
 335         unsigned long vaddr;
 336
 337         vaddr = __get_free_page(GFP_KERNEL);
 338         BUG_ON(!vaddr);
 339         return __pa(vaddr);
 340 }
 341
 342 static void __init create_pmd_mapping(pmd_t *pmdp,
 343                                       uintptr_t va, phys_addr_t pa,
 344                                       phys_addr_t sz, pgprot_t prot)
 345 {
 346         pte_t *ptep;
 347         phys_addr_t pte_phys;
 348         uintptr_t pmd_idx = pmd_index(va);
 349
 350         if (sz == PMD_SIZE) {
 351                 if (pmd_none(pmdp[pmd_idx]))
 352                         pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
 353                 return;
 354         }
 355
 356         if (pmd_none(pmdp[pmd_idx])) {
 357                 pte_phys = pt_ops.alloc_pte(va);
 358                 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
 359                 ptep = pt_ops.get_pte_virt(pte_phys);
 360                 memset(ptep, 0, PAGE_SIZE);
 361         } else {
 362                 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
 363                 ptep = pt_ops.get_pte_virt(pte_phys);
 364         }
 365
 366         create_pte_mapping(ptep, va, pa, sz, prot);
 367 }
 368
 369 #define pgd_next_t              pmd_t
 370 #define alloc_pgd_next(__va)    pt_ops.alloc_pmd(__va)
 371 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
 372 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 373         create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
 374 #define fixmap_pgd_next         fixmap_pmd
 375 #else
 376 #define pgd_next_t              pte_t
 377 #define alloc_pgd_next(__va)    pt_ops.alloc_pte(__va)
 378 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
 379 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 380         create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
 381 #define fixmap_pgd_next         fixmap_pte
 382 #endif
 383
 384 void __init create_pgd_mapping(pgd_t *pgdp,
 385                                       uintptr_t va, phys_addr_t pa,
 386                                       phys_addr_t sz, pgprot_t prot)
 387 {
 388         pgd_next_t *nextp;
 389         phys_addr_t next_phys;
 390         uintptr_t pgd_idx = pgd_index(va);
 391
 392         if (sz == PGDIR_SIZE) {
 393                 if (pgd_val(pgdp[pgd_idx]) == 0)
 394                         pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
 395                 return;
 396         }
 397
 398         if (pgd_val(pgdp[pgd_idx]) == 0) {
 399                 next_phys = alloc_pgd_next(va);
 400                 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
 401                 nextp = get_pgd_next_virt(next_phys);
 402                 memset(nextp, 0, PAGE_SIZE);
 403         } else {
 404                 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
 405                 nextp = get_pgd_next_virt(next_phys);
 406         }
 407
 408         create_pgd_next_mapping(nextp, va, pa, sz, prot);
 409 }
 410
 411 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
 412 {
 413         /* Upgrade to PMD_SIZE mappings whenever possible */
 414         if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
 415                 return PAGE_SIZE;
 416
 417         return PMD_SIZE;
 418 }
 419
 420 /*
 421  * setup_vm() is called from head.S with MMU-off.
 422  *
 423  * Following requirements should be honoured for setup_vm() to work
 424  * correctly:
 425  * 1) It should use PC-relative addressing for accessing kernel symbols.
 426  *    To achieve this we always use GCC cmodel=medany.
 427  * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
 428  *    so disable compiler instrumentation when FTRACE is enabled.
 429  *
 430  * Currently, the above requirements are honoured by using custom CFLAGS
 431  * for init.o in mm/Makefile.
 432  */
 433
 434 #ifndef __riscv_cmodel_medany
 435 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
 436 #endif
 437
 438 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 439 {
 440         uintptr_t va, pa, end_va;
 441         uintptr_t load_pa = (uintptr_t)(&_start);
 442         uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
 443         uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE);
 444 #ifndef __PAGETABLE_PMD_FOLDED
 445         pmd_t fix_bmap_spmd, fix_bmap_epmd;
 446 #endif
 447
 448         va_pa_offset = PAGE_OFFSET - load_pa;
 449         pfn_base = PFN_DOWN(load_pa);
 450
 451         /*
 452          * Enforce boot alignment requirements of RV32 and
 453          * RV64 by only allowing PMD or PGD mappings.
 454          */
 455         BUG_ON(map_size == PAGE_SIZE);
 456
 457         /* Sanity check alignment and size */
 458         BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
 459         BUG_ON((load_pa % map_size) != 0);
 460         BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);
 461
 462         pt_ops.alloc_pte = alloc_pte_early;
 463         pt_ops.get_pte_virt = get_pte_virt_early;
 464 #ifndef __PAGETABLE_PMD_FOLDED
 465         pt_ops.alloc_pmd = alloc_pmd_early;
 466         pt_ops.get_pmd_virt = get_pmd_virt_early;
 467 #endif
 468         /* Setup early PGD for fixmap */
 469         create_pgd_mapping(early_pg_dir, FIXADDR_START,
 470                            (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
 471
 472 #ifndef __PAGETABLE_PMD_FOLDED
 473         /* Setup fixmap PMD */
 474         create_pmd_mapping(fixmap_pmd, FIXADDR_START,
 475                            (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
 476         /* Setup trampoline PGD and PMD */
 477         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 478                            (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
 479         create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
 480                            load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
 481 #else
 482         /* Setup trampoline PGD */
 483         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 484                            load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
 485 #endif
 486
 487         /*
 488          * Setup early PGD covering entire kernel which will allows
 489          * us to reach paging_init(). We map all memory banks later
 490          * in setup_vm_final() below.
 491          */
 492         end_va = PAGE_OFFSET + load_sz;
 493         for (va = PAGE_OFFSET; va < end_va; va += map_size)
 494                 create_pgd_mapping(early_pg_dir, va,
 495                                    load_pa + (va - PAGE_OFFSET),
 496                                    map_size, PAGE_KERNEL_EXEC);
 497
 498 #ifndef __PAGETABLE_PMD_FOLDED
 499         /* Setup early PMD for DTB */
 500         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 501                            (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
 502         /* Create two consecutive PMD mappings for FDT early scan */
 503         pa = dtb_pa & ~(PMD_SIZE - 1);
 504         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
 505                            pa, PMD_SIZE, PAGE_KERNEL);
 506         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
 507                            pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
 508         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
 509 #else
 510         /* Create two consecutive PGD mappings for FDT early scan */
 511         pa = dtb_pa & ~(PGDIR_SIZE - 1);
 512         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 513                            pa, PGDIR_SIZE, PAGE_KERNEL);
 514         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
 515                            pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
 516         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
 517 #endif
 518         dtb_early_pa = dtb_pa;
 519
 520         /*
 521          * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
 522          * range can not span multiple pmds.
 523          */
 524         BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
 525                      != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
 526
 527 #ifndef __PAGETABLE_PMD_FOLDED
 528         /*
 529          * Early ioremap fixmap is already created as it lies within first 2MB
 530          * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
 531          * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
 532          * the user if not.
 533          */
 534         fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
 535         fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
 536         if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
 537                 WARN_ON(1);
 538                 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
 539                         pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
 540                 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
 541                         fix_to_virt(FIX_BTMAP_BEGIN));
 542                 pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
 543                         fix_to_virt(FIX_BTMAP_END));
 544
 545                 pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
 546                 pr_warn("FIX_BTMAP_BEGIN:     %d\n", FIX_BTMAP_BEGIN);
 547         }
 548 #endif
 549 }
 550
 551 static void __init setup_vm_final(void)
 552 {
 553         uintptr_t va, map_size;
 554         phys_addr_t pa, start, end;
 555         u64 i;
 556
 557         /**
 558          * MMU is enabled at this point. But page table setup is not complete yet.
 559          * fixmap page table alloc functions should be used at this point
 560          */
 561         pt_ops.alloc_pte = alloc_pte_fixmap;
 562         pt_ops.get_pte_virt = get_pte_virt_fixmap;
 563 #ifndef __PAGETABLE_PMD_FOLDED
 564         pt_ops.alloc_pmd = alloc_pmd_fixmap;
 565         pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
 566 #endif
 567         /* Setup swapper PGD for fixmap */
 568         create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
 569                            __pa_symbol(fixmap_pgd_next),
 570                            PGDIR_SIZE, PAGE_TABLE);
 571
 572         /* Map all memory banks */
 573         for_each_mem_range(i, &start, &end) {
 574                 if (start >= end)
 575                         break;
 576                 if (start <= __pa(PAGE_OFFSET) &&
 577                     __pa(PAGE_OFFSET) < end)
 578                         start = __pa(PAGE_OFFSET);
 579
 580                 map_size = best_map_size(start, end - start);
 581                 for (pa = start; pa < end; pa += map_size) {
 582                         va = (uintptr_t)__va(pa);
 583                         create_pgd_mapping(swapper_pg_dir, va, pa,
 584                                            map_size, PAGE_KERNEL_EXEC);
 585                 }
 586         }
 587
 588         /* Clear fixmap PTE and PMD mappings */
 589         clear_fixmap(FIX_PTE);
 590         clear_fixmap(FIX_PMD);
 591
 592         /* Move to swapper page table */
 593         csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
 594         local_flush_tlb_all();
 595
 596         /* generic page allocation functions must be used to setup page table */
 597         pt_ops.alloc_pte = alloc_pte_late;
 598         pt_ops.get_pte_virt = get_pte_virt_late;
 599 #ifndef __PAGETABLE_PMD_FOLDED
 600         pt_ops.alloc_pmd = alloc_pmd_late;
 601         pt_ops.get_pmd_virt = get_pmd_virt_late;
 602 #endif
 603 }
 604 #else
 605 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 606 {
 607 #ifdef CONFIG_BUILTIN_DTB
 608         dtb_early_va = soc_lookup_builtin_dtb();
 609         if (!dtb_early_va) {
 610                 /* Fallback to first available DTS */
 611                 dtb_early_va = (void *) __dtb_start;
 612         }
 613 #else
 614         dtb_early_va = (void *)dtb_pa;
 615 #endif
 616         dtb_early_pa = dtb_pa;
 617 }
 618
 619 static inline void setup_vm_final(void)
 620 {
 621 }
 622 #endif /* CONFIG_MMU */
 623
 624 #ifdef CONFIG_STRICT_KERNEL_RWX
 625 void protect_kernel_text_data(void)
 626 {
 627         unsigned long text_start = (unsigned long)_start;
 628         unsigned long init_text_start = (unsigned long)__init_text_begin;
 629         unsigned long init_data_start = (unsigned long)__init_data_begin;
 630         unsigned long rodata_start = (unsigned long)__start_rodata;
 631         unsigned long data_start = (unsigned long)_data;
 632         unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
 633
 634         set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
 635         set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
 636         set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
 637         /* rodata section is marked readonly in mark_rodata_ro */
 638         set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 639         set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
 640 }
 641
 642 void mark_rodata_ro(void)
 643 {
 644         unsigned long rodata_start = (unsigned long)__start_rodata;
 645         unsigned long data_start = (unsigned long)_data;
 646
 647         set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 648
 649         debug_checkwx();
 650 }
 651 #endif
 652
 653 void __init paging_init(void)
 654 {
 655         setup_vm_final();
 656         sparse_init();
 657         setup_zero_page();
 658         zone_sizes_init();
 659 }
 660
 661 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 662 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 663                                struct vmem_altmap *altmap)
 664 {
 665         return vmemmap_populate_basepages(start, end, node, NULL);
 666 }
 667 #endif