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.
5 * Copyright (C) 2020 FORTH-ICS/CARV
6 * Nick Kossifidis <mick@ics.forth.gr>
9 #include <linux/init.h>
11 #include <linux/memblock.h>
12 #include <linux/initrd.h>
13 #include <linux/swap.h>
14 #include <linux/sizes.h>
15 #include <linux/of_fdt.h>
16 #include <linux/of_reserved_mem.h>
17 #include <linux/libfdt.h>
18 #include <linux/set_memory.h>
19 #include <linux/dma-map-ops.h>
20 #include <linux/crash_dump.h>
22 #include <asm/fixmap.h>
23 #include <asm/tlbflush.h>
24 #include <asm/sections.h>
27 #include <asm/ptdump.h>
30 #include "../kernel/head.h"
32 unsigned long kernel_virt_addr = KERNEL_LINK_ADDR;
33 EXPORT_SYMBOL(kernel_virt_addr);
34 #ifdef CONFIG_XIP_KERNEL
35 #define kernel_virt_addr (*((unsigned long *)XIP_FIXUP(&kernel_virt_addr)))
38 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
40 EXPORT_SYMBOL(empty_zero_page);
43 #define DTB_EARLY_BASE_VA PGDIR_SIZE
44 void *_dtb_early_va __initdata;
45 uintptr_t _dtb_early_pa __initdata;
48 pte_t *(*get_pte_virt)(phys_addr_t pa);
49 phys_addr_t (*alloc_pte)(uintptr_t va);
50 #ifndef __PAGETABLE_PMD_FOLDED
51 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
52 phys_addr_t (*alloc_pmd)(uintptr_t va);
56 static phys_addr_t dma32_phys_limit __ro_after_init;
58 static void __init zone_sizes_init(void)
60 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
62 #ifdef CONFIG_ZONE_DMA32
63 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
65 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
67 free_area_init(max_zone_pfns);
70 static void __init setup_zero_page(void)
72 memset((void *)empty_zero_page, 0, PAGE_SIZE);
75 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
76 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
78 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
82 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
84 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
88 static void __init print_vm_layout(void)
90 pr_notice("Virtual kernel memory layout:\n");
91 print_mlk("fixmap", (unsigned long)FIXADDR_START,
92 (unsigned long)FIXADDR_TOP);
93 print_mlm("pci io", (unsigned long)PCI_IO_START,
94 (unsigned long)PCI_IO_END);
95 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
96 (unsigned long)VMEMMAP_END);
97 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
98 (unsigned long)VMALLOC_END);
99 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
100 (unsigned long)high_memory);
102 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
103 (unsigned long)ADDRESS_SPACE_END);
107 static void print_vm_layout(void) { }
108 #endif /* CONFIG_DEBUG_VM */
110 void __init mem_init(void)
112 #ifdef CONFIG_FLATMEM
114 #endif /* CONFIG_FLATMEM */
116 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
122 void __init setup_bootmem(void)
124 phys_addr_t vmlinux_end = __pa_symbol(&_end);
125 phys_addr_t vmlinux_start = __pa_symbol(&_start);
126 phys_addr_t dram_end = memblock_end_of_DRAM();
127 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
129 #ifdef CONFIG_XIP_KERNEL
130 vmlinux_start = __pa_symbol(&_sdata);
133 /* The maximal physical memory size is -PAGE_OFFSET. */
134 memblock_enforce_memory_limit(-PAGE_OFFSET);
137 * Reserve from the start of the kernel to the end of the kernel
138 * and make sure we align the reservation on PMD_SIZE since we will
139 * map the kernel in the linear mapping as read-only: we do not want
140 * any allocation to happen between _end and the next pmd aligned page.
142 memblock_reserve(vmlinux_start, (vmlinux_end - vmlinux_start + PMD_SIZE - 1) & PMD_MASK);
145 * memblock allocator is not aware of the fact that last 4K bytes of
146 * the addressable memory can not be mapped because of IS_ERR_VALUE
147 * macro. Make sure that last 4k bytes are not usable by memblock
148 * if end of dram is equal to maximum addressable memory.
150 if (max_mapped_addr == (dram_end - 1))
151 memblock_set_current_limit(max_mapped_addr - 4096);
153 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
154 max_low_pfn = max_pfn = PFN_DOWN(dram_end);
156 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
157 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
159 reserve_initrd_mem();
161 * If DTB is built in, no need to reserve its memblock.
162 * Otherwise, do reserve it but avoid using
163 * early_init_fdt_reserve_self() since __pa() does
164 * not work for DTB pointers that are fixmap addresses
166 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
167 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
169 early_init_fdt_scan_reserved_mem();
170 dma_contiguous_reserve(dma32_phys_limit);
171 memblock_allow_resize();
174 #ifdef CONFIG_XIP_KERNEL
176 extern char _xiprom[], _exiprom[];
177 extern char _sdata[], _edata[];
179 #endif /* CONFIG_XIP_KERNEL */
182 static struct pt_alloc_ops _pt_ops __ro_after_init;
184 #ifdef CONFIG_XIP_KERNEL
185 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
187 #define pt_ops _pt_ops
190 /* Offset between linear mapping virtual address and kernel load address */
191 unsigned long va_pa_offset __ro_after_init;
192 EXPORT_SYMBOL(va_pa_offset);
193 #ifdef CONFIG_XIP_KERNEL
194 #define va_pa_offset (*((unsigned long *)XIP_FIXUP(&va_pa_offset)))
196 /* Offset between kernel mapping virtual address and kernel load address */
198 unsigned long va_kernel_pa_offset;
199 EXPORT_SYMBOL(va_kernel_pa_offset);
201 #ifdef CONFIG_XIP_KERNEL
202 #define va_kernel_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_pa_offset)))
204 unsigned long va_kernel_xip_pa_offset;
205 EXPORT_SYMBOL(va_kernel_xip_pa_offset);
206 #ifdef CONFIG_XIP_KERNEL
207 #define va_kernel_xip_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_xip_pa_offset)))
209 unsigned long pfn_base __ro_after_init;
210 EXPORT_SYMBOL(pfn_base);
212 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
213 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
214 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
216 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
218 #ifdef CONFIG_XIP_KERNEL
219 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
220 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
221 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
222 #endif /* CONFIG_XIP_KERNEL */
224 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
226 unsigned long addr = __fix_to_virt(idx);
229 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
231 ptep = &fixmap_pte[pte_index(addr)];
233 if (pgprot_val(prot))
234 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
236 pte_clear(&init_mm, addr, ptep);
237 local_flush_tlb_page(addr);
240 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
242 return (pte_t *)((uintptr_t)pa);
245 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
247 clear_fixmap(FIX_PTE);
248 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
251 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
253 return (pte_t *) __va(pa);
256 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
259 * We only create PMD or PGD early mappings so we
260 * should never reach here with MMU disabled.
265 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
267 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
270 static phys_addr_t alloc_pte_late(uintptr_t va)
274 vaddr = __get_free_page(GFP_KERNEL);
275 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
280 static void __init create_pte_mapping(pte_t *ptep,
281 uintptr_t va, phys_addr_t pa,
282 phys_addr_t sz, pgprot_t prot)
284 uintptr_t pte_idx = pte_index(va);
286 BUG_ON(sz != PAGE_SIZE);
288 if (pte_none(ptep[pte_idx]))
289 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
292 #ifndef __PAGETABLE_PMD_FOLDED
294 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
295 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
296 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
297 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
299 #ifdef CONFIG_XIP_KERNEL
300 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
301 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
302 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
303 #endif /* CONFIG_XIP_KERNEL */
305 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
307 /* Before MMU is enabled */
308 return (pmd_t *)((uintptr_t)pa);
311 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
313 clear_fixmap(FIX_PMD);
314 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
317 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
319 return (pmd_t *) __va(pa);
322 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
324 BUG_ON((va - kernel_virt_addr) >> PGDIR_SHIFT);
326 return (uintptr_t)early_pmd;
329 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
331 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
334 static phys_addr_t alloc_pmd_late(uintptr_t va)
338 vaddr = __get_free_page(GFP_KERNEL);
343 static void __init create_pmd_mapping(pmd_t *pmdp,
344 uintptr_t va, phys_addr_t pa,
345 phys_addr_t sz, pgprot_t prot)
348 phys_addr_t pte_phys;
349 uintptr_t pmd_idx = pmd_index(va);
351 if (sz == PMD_SIZE) {
352 if (pmd_none(pmdp[pmd_idx]))
353 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
357 if (pmd_none(pmdp[pmd_idx])) {
358 pte_phys = pt_ops.alloc_pte(va);
359 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
360 ptep = pt_ops.get_pte_virt(pte_phys);
361 memset(ptep, 0, PAGE_SIZE);
363 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
364 ptep = pt_ops.get_pte_virt(pte_phys);
367 create_pte_mapping(ptep, va, pa, sz, prot);
370 #define pgd_next_t pmd_t
371 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
372 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
373 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
374 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
375 #define fixmap_pgd_next fixmap_pmd
377 #define pgd_next_t pte_t
378 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
379 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
380 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
381 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
382 #define fixmap_pgd_next fixmap_pte
385 void __init create_pgd_mapping(pgd_t *pgdp,
386 uintptr_t va, phys_addr_t pa,
387 phys_addr_t sz, pgprot_t prot)
390 phys_addr_t next_phys;
391 uintptr_t pgd_idx = pgd_index(va);
393 if (sz == PGDIR_SIZE) {
394 if (pgd_val(pgdp[pgd_idx]) == 0)
395 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
399 if (pgd_val(pgdp[pgd_idx]) == 0) {
400 next_phys = alloc_pgd_next(va);
401 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
402 nextp = get_pgd_next_virt(next_phys);
403 memset(nextp, 0, PAGE_SIZE);
405 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
406 nextp = get_pgd_next_virt(next_phys);
409 create_pgd_next_mapping(nextp, va, pa, sz, prot);
412 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
414 /* Upgrade to PMD_SIZE mappings whenever possible */
415 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
421 #ifdef CONFIG_XIP_KERNEL
422 /* called from head.S with MMU off */
423 asmlinkage void __init __copy_data(void)
425 void *from = (void *)(&_sdata);
426 void *end = (void *)(&_end);
427 void *to = (void *)CONFIG_PHYS_RAM_BASE;
428 size_t sz = (size_t)(end - from + 1);
430 memcpy(to, from, sz);
435 * setup_vm() is called from head.S with MMU-off.
437 * Following requirements should be honoured for setup_vm() to work
439 * 1) It should use PC-relative addressing for accessing kernel symbols.
440 * To achieve this we always use GCC cmodel=medany.
441 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
442 * so disable compiler instrumentation when FTRACE is enabled.
444 * Currently, the above requirements are honoured by using custom CFLAGS
445 * for init.o in mm/Makefile.
448 #ifndef __riscv_cmodel_medany
449 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
452 uintptr_t load_pa, load_sz;
453 #ifdef CONFIG_XIP_KERNEL
454 #define load_pa (*((uintptr_t *)XIP_FIXUP(&load_pa)))
455 #define load_sz (*((uintptr_t *)XIP_FIXUP(&load_sz)))
458 #ifdef CONFIG_XIP_KERNEL
459 uintptr_t xiprom, xiprom_sz;
460 #define xiprom_sz (*((uintptr_t *)XIP_FIXUP(&xiprom_sz)))
461 #define xiprom (*((uintptr_t *)XIP_FIXUP(&xiprom)))
463 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size)
465 uintptr_t va, end_va;
467 /* Map the flash resident part */
468 end_va = kernel_virt_addr + xiprom_sz;
469 for (va = kernel_virt_addr; va < end_va; va += map_size)
470 create_pgd_mapping(pgdir, va,
471 xiprom + (va - kernel_virt_addr),
472 map_size, PAGE_KERNEL_EXEC);
474 /* Map the data in RAM */
475 end_va = kernel_virt_addr + XIP_OFFSET + load_sz;
476 for (va = kernel_virt_addr + XIP_OFFSET; va < end_va; va += map_size)
477 create_pgd_mapping(pgdir, va,
478 load_pa + (va - (kernel_virt_addr + XIP_OFFSET)),
479 map_size, PAGE_KERNEL);
482 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size)
484 uintptr_t va, end_va;
486 end_va = kernel_virt_addr + load_sz;
487 for (va = kernel_virt_addr; va < end_va; va += map_size)
488 create_pgd_mapping(pgdir, va,
489 load_pa + (va - kernel_virt_addr),
490 map_size, PAGE_KERNEL_EXEC);
494 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
496 uintptr_t __maybe_unused pa;
498 #ifndef __PAGETABLE_PMD_FOLDED
499 pmd_t fix_bmap_spmd, fix_bmap_epmd;
502 #ifdef CONFIG_XIP_KERNEL
503 xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
504 xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
506 load_pa = (uintptr_t)CONFIG_PHYS_RAM_BASE;
507 load_sz = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
509 va_kernel_xip_pa_offset = kernel_virt_addr - xiprom;
511 load_pa = (uintptr_t)(&_start);
512 load_sz = (uintptr_t)(&_end) - load_pa;
515 va_pa_offset = PAGE_OFFSET - load_pa;
517 va_kernel_pa_offset = kernel_virt_addr - load_pa;
520 pfn_base = PFN_DOWN(load_pa);
523 * Enforce boot alignment requirements of RV32 and
524 * RV64 by only allowing PMD or PGD mappings.
528 /* Sanity check alignment and size */
529 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
530 BUG_ON((load_pa % map_size) != 0);
532 pt_ops.alloc_pte = alloc_pte_early;
533 pt_ops.get_pte_virt = get_pte_virt_early;
534 #ifndef __PAGETABLE_PMD_FOLDED
535 pt_ops.alloc_pmd = alloc_pmd_early;
536 pt_ops.get_pmd_virt = get_pmd_virt_early;
538 /* Setup early PGD for fixmap */
539 create_pgd_mapping(early_pg_dir, FIXADDR_START,
540 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
542 #ifndef __PAGETABLE_PMD_FOLDED
543 /* Setup fixmap PMD */
544 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
545 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
546 /* Setup trampoline PGD and PMD */
547 create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr,
548 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
549 #ifdef CONFIG_XIP_KERNEL
550 create_pmd_mapping(trampoline_pmd, kernel_virt_addr,
551 xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
553 create_pmd_mapping(trampoline_pmd, kernel_virt_addr,
554 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
557 /* Setup trampoline PGD */
558 create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr,
559 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
563 * Setup early PGD covering entire kernel which will allow
564 * us to reach paging_init(). We map all memory banks later
565 * in setup_vm_final() below.
567 create_kernel_page_table(early_pg_dir, map_size);
569 #ifndef __PAGETABLE_PMD_FOLDED
570 /* Setup early PMD for DTB */
571 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
572 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
573 #ifndef CONFIG_BUILTIN_DTB
574 /* Create two consecutive PMD mappings for FDT early scan */
575 pa = dtb_pa & ~(PMD_SIZE - 1);
576 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
577 pa, PMD_SIZE, PAGE_KERNEL);
578 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
579 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
580 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
581 #else /* CONFIG_BUILTIN_DTB */
584 * __va can't be used since it would return a linear mapping address
585 * whereas dtb_early_va will be used before setup_vm_final installs
586 * the linear mapping.
588 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
590 dtb_early_va = __va(dtb_pa);
591 #endif /* CONFIG_64BIT */
592 #endif /* CONFIG_BUILTIN_DTB */
594 #ifndef CONFIG_BUILTIN_DTB
595 /* Create two consecutive PGD mappings for FDT early scan */
596 pa = dtb_pa & ~(PGDIR_SIZE - 1);
597 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
598 pa, PGDIR_SIZE, PAGE_KERNEL);
599 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
600 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
601 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
602 #else /* CONFIG_BUILTIN_DTB */
604 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
606 dtb_early_va = __va(dtb_pa);
607 #endif /* CONFIG_64BIT */
608 #endif /* CONFIG_BUILTIN_DTB */
610 dtb_early_pa = dtb_pa;
613 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
614 * range can not span multiple pmds.
616 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
617 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
619 #ifndef __PAGETABLE_PMD_FOLDED
621 * Early ioremap fixmap is already created as it lies within first 2MB
622 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
623 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
626 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
627 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
628 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
630 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
631 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
632 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
633 fix_to_virt(FIX_BTMAP_BEGIN));
634 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
635 fix_to_virt(FIX_BTMAP_END));
637 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
638 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
643 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
644 void protect_kernel_linear_mapping_text_rodata(void)
646 unsigned long text_start = (unsigned long)lm_alias(_start);
647 unsigned long init_text_start = (unsigned long)lm_alias(__init_text_begin);
648 unsigned long rodata_start = (unsigned long)lm_alias(__start_rodata);
649 unsigned long data_start = (unsigned long)lm_alias(_data);
651 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
652 set_memory_nx(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
654 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
655 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
659 static void __init setup_vm_final(void)
661 uintptr_t va, map_size;
662 phys_addr_t pa, start, end;
666 * MMU is enabled at this point. But page table setup is not complete yet.
667 * fixmap page table alloc functions should be used at this point
669 pt_ops.alloc_pte = alloc_pte_fixmap;
670 pt_ops.get_pte_virt = get_pte_virt_fixmap;
671 #ifndef __PAGETABLE_PMD_FOLDED
672 pt_ops.alloc_pmd = alloc_pmd_fixmap;
673 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
675 /* Setup swapper PGD for fixmap */
676 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
677 __pa_symbol(fixmap_pgd_next),
678 PGDIR_SIZE, PAGE_TABLE);
680 /* Map all memory banks in the linear mapping */
681 for_each_mem_range(i, &start, &end) {
684 if (start <= __pa(PAGE_OFFSET) &&
685 __pa(PAGE_OFFSET) < end)
686 start = __pa(PAGE_OFFSET);
688 map_size = best_map_size(start, end - start);
689 for (pa = start; pa < end; pa += map_size) {
690 va = (uintptr_t)__va(pa);
691 create_pgd_mapping(swapper_pg_dir, va, pa,
705 create_kernel_page_table(swapper_pg_dir, PMD_SIZE);
708 /* Clear fixmap PTE and PMD mappings */
709 clear_fixmap(FIX_PTE);
710 clear_fixmap(FIX_PMD);
712 /* Move to swapper page table */
713 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
714 local_flush_tlb_all();
716 /* generic page allocation functions must be used to setup page table */
717 pt_ops.alloc_pte = alloc_pte_late;
718 pt_ops.get_pte_virt = get_pte_virt_late;
719 #ifndef __PAGETABLE_PMD_FOLDED
720 pt_ops.alloc_pmd = alloc_pmd_late;
721 pt_ops.get_pmd_virt = get_pmd_virt_late;
725 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
727 dtb_early_va = (void *)dtb_pa;
728 dtb_early_pa = dtb_pa;
731 static inline void setup_vm_final(void)
734 #endif /* CONFIG_MMU */
736 #ifdef CONFIG_STRICT_KERNEL_RWX
737 void __init protect_kernel_text_data(void)
739 unsigned long text_start = (unsigned long)_start;
740 unsigned long init_text_start = (unsigned long)__init_text_begin;
741 unsigned long init_data_start = (unsigned long)__init_data_begin;
742 unsigned long rodata_start = (unsigned long)__start_rodata;
743 unsigned long data_start = (unsigned long)_data;
744 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
746 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
747 set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
748 set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
749 /* rodata section is marked readonly in mark_rodata_ro */
750 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
751 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
754 void mark_rodata_ro(void)
756 unsigned long rodata_start = (unsigned long)__start_rodata;
757 unsigned long data_start = (unsigned long)_data;
759 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
765 #ifdef CONFIG_KEXEC_CORE
767 * reserve_crashkernel() - reserves memory for crash kernel
769 * This function reserves memory area given in "crashkernel=" kernel command
770 * line parameter. The memory reserved is used by dump capture kernel when
771 * primary kernel is crashing.
773 static void __init reserve_crashkernel(void)
775 unsigned long long crash_base = 0;
776 unsigned long long crash_size = 0;
777 unsigned long search_start = memblock_start_of_DRAM();
778 unsigned long search_end = memblock_end_of_DRAM();
783 * Don't reserve a region for a crash kernel on a crash kernel
784 * since it doesn't make much sense and we have limited memory
787 #ifdef CONFIG_CRASH_DUMP
788 if (is_kdump_kernel()) {
789 pr_info("crashkernel: ignoring reservation request\n");
794 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
795 &crash_size, &crash_base);
796 if (ret || !crash_size)
799 crash_size = PAGE_ALIGN(crash_size);
801 if (crash_base == 0) {
803 * Current riscv boot protocol requires 2MB alignment for
804 * RV64 and 4MB alignment for RV32 (hugepage size)
806 crash_base = memblock_find_in_range(search_start, search_end,
807 crash_size, PMD_SIZE);
809 if (crash_base == 0) {
810 pr_warn("crashkernel: couldn't allocate %lldKB\n",
815 /* User specifies base address explicitly. */
816 if (!memblock_is_region_memory(crash_base, crash_size)) {
817 pr_warn("crashkernel: requested region is not memory\n");
821 if (memblock_is_region_reserved(crash_base, crash_size)) {
822 pr_warn("crashkernel: requested region is reserved\n");
827 if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
828 pr_warn("crashkernel: requested region is misaligned\n");
832 memblock_reserve(crash_base, crash_size);
834 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
835 crash_base, crash_base + crash_size, crash_size >> 20);
837 crashk_res.start = crash_base;
838 crashk_res.end = crash_base + crash_size - 1;
840 #endif /* CONFIG_KEXEC_CORE */
842 #ifdef CONFIG_CRASH_DUMP
844 * We keep track of the ELF core header of the crashed
845 * kernel with a reserved-memory region with compatible
846 * string "linux,elfcorehdr". Here we register a callback
847 * to populate elfcorehdr_addr/size when this region is
848 * present. Note that this region will be marked as
849 * reserved once we call early_init_fdt_scan_reserved_mem()
852 static int elfcore_hdr_setup(struct reserved_mem *rmem)
854 elfcorehdr_addr = rmem->base;
855 elfcorehdr_size = rmem->size;
859 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
862 void __init paging_init(void)
868 void __init misc_mem_init(void)
870 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
874 #ifdef CONFIG_KEXEC_CORE
875 reserve_crashkernel();
880 #ifdef CONFIG_SPARSEMEM_VMEMMAP
881 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
882 struct vmem_altmap *altmap)
884 return vmemmap_populate_basepages(start, end, node, NULL);