1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
7 #include <linux/init.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>
18 #include <asm/fixmap.h>
19 #include <asm/tlbflush.h>
20 #include <asm/sections.h>
23 #include <asm/ptdump.h>
25 #include "../kernel/head.h"
27 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
29 EXPORT_SYMBOL(empty_zero_page);
32 #define DTB_EARLY_BASE_VA PGDIR_SIZE
33 void *dtb_early_va __initdata;
34 uintptr_t dtb_early_pa __initdata;
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);
45 static phys_addr_t dma32_phys_limit __ro_after_init;
47 static void __init zone_sizes_init(void)
49 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
51 #ifdef CONFIG_ZONE_DMA32
52 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
54 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
56 free_area_init(max_zone_pfns);
59 static void setup_zero_page(void)
61 memset((void *)empty_zero_page, 0, PAGE_SIZE);
64 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
65 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
67 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
71 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
73 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
77 static void print_vm_layout(void)
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);
92 static void print_vm_layout(void) { }
93 #endif /* CONFIG_DEBUG_VM */
95 void __init mem_init(void)
99 #endif /* CONFIG_FLATMEM */
101 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
104 mem_init_print_info(NULL);
108 #ifdef CONFIG_BLK_DEV_INITRD
109 static void __init setup_initrd(void)
114 /* Ignore the virtul address computed during device tree parsing */
115 initrd_start = initrd_end = 0;
117 if (!phys_initrd_size)
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.
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);
129 if (!memblock_is_region_memory(start, size)) {
130 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
135 if (memblock_is_region_reserved(start, size)) {
136 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
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;
147 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
148 (void *)(initrd_start), size);
151 pr_cont(" - disabling initrd\n");
155 #endif /* CONFIG_BLK_DEV_INITRD */
157 void __init setup_bootmem(void)
159 phys_addr_t mem_start = 0;
160 phys_addr_t start, dram_end, end = 0;
161 phys_addr_t vmlinux_end = __pa_symbol(&_end);
162 phys_addr_t vmlinux_start = __pa_symbol(&_start);
163 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
166 /* Find the memory region containing the kernel */
167 for_each_mem_range(i, &start, &end) {
168 phys_addr_t size = end - start;
171 if (start <= vmlinux_start && vmlinux_end <= end)
176 * The maximal physical memory size is -PAGE_OFFSET.
177 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
178 * as it is unusable by kernel.
180 memblock_enforce_memory_limit(-PAGE_OFFSET);
182 /* Reserve from the start of the kernel to the end of the kernel */
183 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
185 dram_end = memblock_end_of_DRAM();
188 * memblock allocator is not aware of the fact that last 4K bytes of
189 * the addressable memory can not be mapped because of IS_ERR_VALUE
190 * macro. Make sure that last 4k bytes are not usable by memblock
191 * if end of dram is equal to maximum addressable memory.
193 if (max_mapped_addr == (dram_end - 1))
194 memblock_set_current_limit(max_mapped_addr - 4096);
196 max_pfn = PFN_DOWN(dram_end);
197 max_low_pfn = max_pfn;
198 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
199 set_max_mapnr(max_low_pfn);
201 #ifdef CONFIG_BLK_DEV_INITRD
203 #endif /* CONFIG_BLK_DEV_INITRD */
206 * Avoid using early_init_fdt_reserve_self() since __pa() does
207 * not work for DTB pointers that are fixmap addresses
209 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
211 early_init_fdt_scan_reserved_mem();
212 dma_contiguous_reserve(dma32_phys_limit);
213 memblock_allow_resize();
218 static struct pt_alloc_ops pt_ops;
220 unsigned long va_pa_offset;
221 EXPORT_SYMBOL(va_pa_offset);
222 unsigned long pfn_base;
223 EXPORT_SYMBOL(pfn_base);
225 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
226 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
227 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
229 #define MAX_EARLY_MAPPING_SIZE SZ_128M
231 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
233 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
235 unsigned long addr = __fix_to_virt(idx);
238 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
240 ptep = &fixmap_pte[pte_index(addr)];
242 if (pgprot_val(prot))
243 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
245 pte_clear(&init_mm, addr, ptep);
246 local_flush_tlb_page(addr);
249 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
251 return (pte_t *)((uintptr_t)pa);
254 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
256 clear_fixmap(FIX_PTE);
257 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
260 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
262 return (pte_t *) __va(pa);
265 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
268 * We only create PMD or PGD early mappings so we
269 * should never reach here with MMU disabled.
274 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
276 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
279 static phys_addr_t alloc_pte_late(uintptr_t va)
283 vaddr = __get_free_page(GFP_KERNEL);
284 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
289 static void __init create_pte_mapping(pte_t *ptep,
290 uintptr_t va, phys_addr_t pa,
291 phys_addr_t sz, pgprot_t prot)
293 uintptr_t pte_idx = pte_index(va);
295 BUG_ON(sz != PAGE_SIZE);
297 if (pte_none(ptep[pte_idx]))
298 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
301 #ifndef __PAGETABLE_PMD_FOLDED
303 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
304 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
306 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
307 #define NUM_EARLY_PMDS 1UL
309 #define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
311 pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
312 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
314 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
316 /* Before MMU is enabled */
317 return (pmd_t *)((uintptr_t)pa);
320 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
322 clear_fixmap(FIX_PMD);
323 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
326 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
328 return (pmd_t *) __va(pa);
331 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
335 pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT;
336 BUG_ON(pmd_num >= NUM_EARLY_PMDS);
337 return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD];
340 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
342 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
345 static phys_addr_t alloc_pmd_late(uintptr_t va)
349 vaddr = __get_free_page(GFP_KERNEL);
354 static void __init create_pmd_mapping(pmd_t *pmdp,
355 uintptr_t va, phys_addr_t pa,
356 phys_addr_t sz, pgprot_t prot)
359 phys_addr_t pte_phys;
360 uintptr_t pmd_idx = pmd_index(va);
362 if (sz == PMD_SIZE) {
363 if (pmd_none(pmdp[pmd_idx]))
364 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
368 if (pmd_none(pmdp[pmd_idx])) {
369 pte_phys = pt_ops.alloc_pte(va);
370 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
371 ptep = pt_ops.get_pte_virt(pte_phys);
372 memset(ptep, 0, PAGE_SIZE);
374 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
375 ptep = pt_ops.get_pte_virt(pte_phys);
378 create_pte_mapping(ptep, va, pa, sz, prot);
381 #define pgd_next_t pmd_t
382 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
383 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
384 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
385 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
386 #define fixmap_pgd_next fixmap_pmd
388 #define pgd_next_t pte_t
389 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
390 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
391 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
392 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
393 #define fixmap_pgd_next fixmap_pte
396 void __init create_pgd_mapping(pgd_t *pgdp,
397 uintptr_t va, phys_addr_t pa,
398 phys_addr_t sz, pgprot_t prot)
401 phys_addr_t next_phys;
402 uintptr_t pgd_idx = pgd_index(va);
404 if (sz == PGDIR_SIZE) {
405 if (pgd_val(pgdp[pgd_idx]) == 0)
406 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
410 if (pgd_val(pgdp[pgd_idx]) == 0) {
411 next_phys = alloc_pgd_next(va);
412 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
413 nextp = get_pgd_next_virt(next_phys);
414 memset(nextp, 0, PAGE_SIZE);
416 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
417 nextp = get_pgd_next_virt(next_phys);
420 create_pgd_next_mapping(nextp, va, pa, sz, prot);
423 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
425 /* Upgrade to PMD_SIZE mappings whenever possible */
426 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
433 * setup_vm() is called from head.S with MMU-off.
435 * Following requirements should be honoured for setup_vm() to work
437 * 1) It should use PC-relative addressing for accessing kernel symbols.
438 * To achieve this we always use GCC cmodel=medany.
439 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
440 * so disable compiler instrumentation when FTRACE is enabled.
442 * Currently, the above requirements are honoured by using custom CFLAGS
443 * for init.o in mm/Makefile.
446 #ifndef __riscv_cmodel_medany
447 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
450 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
452 uintptr_t va, pa, end_va;
453 uintptr_t load_pa = (uintptr_t)(&_start);
454 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
455 uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE);
456 #ifndef __PAGETABLE_PMD_FOLDED
457 pmd_t fix_bmap_spmd, fix_bmap_epmd;
460 va_pa_offset = PAGE_OFFSET - load_pa;
461 pfn_base = PFN_DOWN(load_pa);
464 * Enforce boot alignment requirements of RV32 and
465 * RV64 by only allowing PMD or PGD mappings.
467 BUG_ON(map_size == PAGE_SIZE);
469 /* Sanity check alignment and size */
470 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
471 BUG_ON((load_pa % map_size) != 0);
472 BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);
474 pt_ops.alloc_pte = alloc_pte_early;
475 pt_ops.get_pte_virt = get_pte_virt_early;
476 #ifndef __PAGETABLE_PMD_FOLDED
477 pt_ops.alloc_pmd = alloc_pmd_early;
478 pt_ops.get_pmd_virt = get_pmd_virt_early;
480 /* Setup early PGD for fixmap */
481 create_pgd_mapping(early_pg_dir, FIXADDR_START,
482 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
484 #ifndef __PAGETABLE_PMD_FOLDED
485 /* Setup fixmap PMD */
486 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
487 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
488 /* Setup trampoline PGD and PMD */
489 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
490 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
491 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
492 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
494 /* Setup trampoline PGD */
495 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
496 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
500 * Setup early PGD covering entire kernel which will allows
501 * us to reach paging_init(). We map all memory banks later
502 * in setup_vm_final() below.
504 end_va = PAGE_OFFSET + load_sz;
505 for (va = PAGE_OFFSET; va < end_va; va += map_size)
506 create_pgd_mapping(early_pg_dir, va,
507 load_pa + (va - PAGE_OFFSET),
508 map_size, PAGE_KERNEL_EXEC);
510 #ifndef __PAGETABLE_PMD_FOLDED
511 /* Setup early PMD for DTB */
512 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
513 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
514 /* Create two consecutive PMD mappings for FDT early scan */
515 pa = dtb_pa & ~(PMD_SIZE - 1);
516 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
517 pa, PMD_SIZE, PAGE_KERNEL);
518 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
519 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
520 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
522 /* Create two consecutive PGD mappings for FDT early scan */
523 pa = dtb_pa & ~(PGDIR_SIZE - 1);
524 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
525 pa, PGDIR_SIZE, PAGE_KERNEL);
526 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
527 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
528 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
530 dtb_early_pa = dtb_pa;
533 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
534 * range can not span multiple pmds.
536 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
537 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
539 #ifndef __PAGETABLE_PMD_FOLDED
541 * Early ioremap fixmap is already created as it lies within first 2MB
542 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
543 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
546 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
547 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
548 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
550 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
551 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
552 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
553 fix_to_virt(FIX_BTMAP_BEGIN));
554 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
555 fix_to_virt(FIX_BTMAP_END));
557 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
558 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
563 static void __init setup_vm_final(void)
565 uintptr_t va, map_size;
566 phys_addr_t pa, start, end;
570 * MMU is enabled at this point. But page table setup is not complete yet.
571 * fixmap page table alloc functions should be used at this point
573 pt_ops.alloc_pte = alloc_pte_fixmap;
574 pt_ops.get_pte_virt = get_pte_virt_fixmap;
575 #ifndef __PAGETABLE_PMD_FOLDED
576 pt_ops.alloc_pmd = alloc_pmd_fixmap;
577 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
579 /* Setup swapper PGD for fixmap */
580 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
581 __pa_symbol(fixmap_pgd_next),
582 PGDIR_SIZE, PAGE_TABLE);
584 /* Map all memory banks */
585 for_each_mem_range(i, &start, &end) {
588 if (start <= __pa(PAGE_OFFSET) &&
589 __pa(PAGE_OFFSET) < end)
590 start = __pa(PAGE_OFFSET);
592 map_size = best_map_size(start, end - start);
593 for (pa = start; pa < end; pa += map_size) {
594 va = (uintptr_t)__va(pa);
595 create_pgd_mapping(swapper_pg_dir, va, pa,
596 map_size, PAGE_KERNEL_EXEC);
600 /* Clear fixmap PTE and PMD mappings */
601 clear_fixmap(FIX_PTE);
602 clear_fixmap(FIX_PMD);
604 /* Move to swapper page table */
605 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
606 local_flush_tlb_all();
608 /* generic page allocation functions must be used to setup page table */
609 pt_ops.alloc_pte = alloc_pte_late;
610 pt_ops.get_pte_virt = get_pte_virt_late;
611 #ifndef __PAGETABLE_PMD_FOLDED
612 pt_ops.alloc_pmd = alloc_pmd_late;
613 pt_ops.get_pmd_virt = get_pmd_virt_late;
617 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
619 #ifdef CONFIG_BUILTIN_DTB
620 dtb_early_va = soc_lookup_builtin_dtb();
622 /* Fallback to first available DTS */
623 dtb_early_va = (void *) __dtb_start;
626 dtb_early_va = (void *)dtb_pa;
628 dtb_early_pa = dtb_pa;
631 static inline void setup_vm_final(void)
634 #endif /* CONFIG_MMU */
636 #ifdef CONFIG_STRICT_KERNEL_RWX
637 void protect_kernel_text_data(void)
639 unsigned long text_start = (unsigned long)_start;
640 unsigned long init_text_start = (unsigned long)__init_text_begin;
641 unsigned long init_data_start = (unsigned long)__init_data_begin;
642 unsigned long rodata_start = (unsigned long)__start_rodata;
643 unsigned long data_start = (unsigned long)_data;
644 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
646 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
647 set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
648 set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
649 /* rodata section is marked readonly in mark_rodata_ro */
650 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
651 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
654 void mark_rodata_ro(void)
656 unsigned long rodata_start = (unsigned long)__start_rodata;
657 unsigned long data_start = (unsigned long)_data;
659 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
665 void __init paging_init(void)
673 #ifdef CONFIG_SPARSEMEM_VMEMMAP
674 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
675 struct vmem_altmap *altmap)
677 return vmemmap_populate_basepages(start, end, node, NULL);