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/swiotlb.h>
15 #include <linux/sizes.h>
16 #include <linux/of_fdt.h>
17 #include <linux/of_reserved_mem.h>
18 #include <linux/libfdt.h>
19 #include <linux/set_memory.h>
20 #include <linux/dma-map-ops.h>
21 #include <linux/crash_dump.h>
23 #include <asm/fixmap.h>
24 #include <asm/tlbflush.h>
25 #include <asm/sections.h>
28 #include <asm/ptdump.h>
31 #include "../kernel/head.h"
33 struct kernel_mapping kernel_map __ro_after_init;
34 EXPORT_SYMBOL(kernel_map);
35 #ifdef CONFIG_XIP_KERNEL
36 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
39 phys_addr_t phys_ram_base __ro_after_init;
40 EXPORT_SYMBOL(phys_ram_base);
42 #ifdef CONFIG_XIP_KERNEL
43 extern char _xiprom[], _exiprom[];
46 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
48 EXPORT_SYMBOL(empty_zero_page);
51 #define DTB_EARLY_BASE_VA PGDIR_SIZE
52 void *_dtb_early_va __initdata;
53 uintptr_t _dtb_early_pa __initdata;
56 pte_t *(*get_pte_virt)(phys_addr_t pa);
57 phys_addr_t (*alloc_pte)(uintptr_t va);
58 #ifndef __PAGETABLE_PMD_FOLDED
59 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
60 phys_addr_t (*alloc_pmd)(uintptr_t va);
64 static phys_addr_t dma32_phys_limit __initdata;
66 static void __init zone_sizes_init(void)
68 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
70 #ifdef CONFIG_ZONE_DMA32
71 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
73 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
75 free_area_init(max_zone_pfns);
78 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
79 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
81 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
85 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
87 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
91 static void __init print_vm_layout(void)
93 pr_notice("Virtual kernel memory layout:\n");
94 print_mlk("fixmap", (unsigned long)FIXADDR_START,
95 (unsigned long)FIXADDR_TOP);
96 print_mlm("pci io", (unsigned long)PCI_IO_START,
97 (unsigned long)PCI_IO_END);
98 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
99 (unsigned long)VMEMMAP_END);
100 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
101 (unsigned long)VMALLOC_END);
102 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
103 (unsigned long)high_memory);
105 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
106 (unsigned long)ADDRESS_SPACE_END);
110 static void print_vm_layout(void) { }
111 #endif /* CONFIG_DEBUG_VM */
113 void __init mem_init(void)
115 #ifdef CONFIG_FLATMEM
117 #endif /* CONFIG_FLATMEM */
119 #ifdef CONFIG_SWIOTLB
120 if (swiotlb_force == SWIOTLB_FORCE ||
121 max_pfn > PFN_DOWN(dma32_phys_limit))
124 swiotlb_force = SWIOTLB_NO_FORCE;
126 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
133 * The default maximal physical memory size is -PAGE_OFFSET for 32-bit kernel,
134 * whereas for 64-bit kernel, the end of the virtual address space is occupied
135 * by the modules/BPF/kernel mappings which reduces the available size of the
137 * Limit the memory size via mem.
140 static phys_addr_t memory_limit = -PAGE_OFFSET - SZ_4G;
142 static phys_addr_t memory_limit = -PAGE_OFFSET;
145 static int __init early_mem(char *p)
152 size = memparse(p, &p) & PAGE_MASK;
153 memory_limit = min_t(u64, size, memory_limit);
155 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
159 early_param("mem", early_mem);
161 static void __init setup_bootmem(void)
163 phys_addr_t vmlinux_end = __pa_symbol(&_end);
164 phys_addr_t vmlinux_start = __pa_symbol(&_start);
165 phys_addr_t __maybe_unused max_mapped_addr;
166 phys_addr_t phys_ram_end;
168 #ifdef CONFIG_XIP_KERNEL
169 vmlinux_start = __pa_symbol(&_sdata);
172 memblock_enforce_memory_limit(memory_limit);
175 * Reserve from the start of the kernel to the end of the kernel
177 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
179 * Make sure we align the reservation on PMD_SIZE since we will
180 * map the kernel in the linear mapping as read-only: we do not want
181 * any allocation to happen between _end and the next pmd aligned page.
183 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
185 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
188 phys_ram_end = memblock_end_of_DRAM();
190 #ifndef CONFIG_XIP_KERNEL
191 phys_ram_base = memblock_start_of_DRAM();
194 * memblock allocator is not aware of the fact that last 4K bytes of
195 * the addressable memory can not be mapped because of IS_ERR_VALUE
196 * macro. Make sure that last 4k bytes are not usable by memblock
197 * if end of dram is equal to maximum addressable memory. For 64-bit
198 * kernel, this problem can't happen here as the end of the virtual
199 * address space is occupied by the kernel mapping then this check must
200 * be done as soon as the kernel mapping base address is determined.
202 max_mapped_addr = __pa(~(ulong)0);
203 if (max_mapped_addr == (phys_ram_end - 1))
204 memblock_set_current_limit(max_mapped_addr - 4096);
207 min_low_pfn = PFN_UP(phys_ram_base);
208 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
210 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
211 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
213 reserve_initrd_mem();
215 * If DTB is built in, no need to reserve its memblock.
216 * Otherwise, do reserve it but avoid using
217 * early_init_fdt_reserve_self() since __pa() does
218 * not work for DTB pointers that are fixmap addresses
220 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
221 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
223 early_init_fdt_scan_reserved_mem();
224 dma_contiguous_reserve(dma32_phys_limit);
225 memblock_allow_resize();
229 static struct pt_alloc_ops _pt_ops __initdata;
231 #ifdef CONFIG_XIP_KERNEL
232 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
234 #define pt_ops _pt_ops
237 unsigned long pfn_base __ro_after_init;
238 EXPORT_SYMBOL(pfn_base);
240 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
241 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
242 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
244 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
246 #ifdef CONFIG_XIP_KERNEL
247 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
248 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
249 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
250 #endif /* CONFIG_XIP_KERNEL */
252 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
254 unsigned long addr = __fix_to_virt(idx);
257 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
259 ptep = &fixmap_pte[pte_index(addr)];
261 if (pgprot_val(prot))
262 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
264 pte_clear(&init_mm, addr, ptep);
265 local_flush_tlb_page(addr);
268 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
270 return (pte_t *)((uintptr_t)pa);
273 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
275 clear_fixmap(FIX_PTE);
276 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
279 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
281 return (pte_t *) __va(pa);
284 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
287 * We only create PMD or PGD early mappings so we
288 * should never reach here with MMU disabled.
293 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
295 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
298 static phys_addr_t __init alloc_pte_late(uintptr_t va)
302 vaddr = __get_free_page(GFP_KERNEL);
303 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
308 static void __init create_pte_mapping(pte_t *ptep,
309 uintptr_t va, phys_addr_t pa,
310 phys_addr_t sz, pgprot_t prot)
312 uintptr_t pte_idx = pte_index(va);
314 BUG_ON(sz != PAGE_SIZE);
316 if (pte_none(ptep[pte_idx]))
317 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
320 #ifndef __PAGETABLE_PMD_FOLDED
322 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
323 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
324 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
325 static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
327 #ifdef CONFIG_XIP_KERNEL
328 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
329 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
330 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
331 #endif /* CONFIG_XIP_KERNEL */
333 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
335 /* Before MMU is enabled */
336 return (pmd_t *)((uintptr_t)pa);
339 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
341 clear_fixmap(FIX_PMD);
342 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
345 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
347 return (pmd_t *) __va(pa);
350 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
352 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
354 return (uintptr_t)early_pmd;
357 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
359 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
362 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
366 vaddr = __get_free_page(GFP_KERNEL);
371 static void __init create_pmd_mapping(pmd_t *pmdp,
372 uintptr_t va, phys_addr_t pa,
373 phys_addr_t sz, pgprot_t prot)
376 phys_addr_t pte_phys;
377 uintptr_t pmd_idx = pmd_index(va);
379 if (sz == PMD_SIZE) {
380 if (pmd_none(pmdp[pmd_idx]))
381 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
385 if (pmd_none(pmdp[pmd_idx])) {
386 pte_phys = pt_ops.alloc_pte(va);
387 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
388 ptep = pt_ops.get_pte_virt(pte_phys);
389 memset(ptep, 0, PAGE_SIZE);
391 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
392 ptep = pt_ops.get_pte_virt(pte_phys);
395 create_pte_mapping(ptep, va, pa, sz, prot);
398 #define pgd_next_t pmd_t
399 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
400 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
401 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
402 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
403 #define fixmap_pgd_next fixmap_pmd
405 #define pgd_next_t pte_t
406 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
407 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
408 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
409 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
410 #define fixmap_pgd_next fixmap_pte
413 void __init create_pgd_mapping(pgd_t *pgdp,
414 uintptr_t va, phys_addr_t pa,
415 phys_addr_t sz, pgprot_t prot)
418 phys_addr_t next_phys;
419 uintptr_t pgd_idx = pgd_index(va);
421 if (sz == PGDIR_SIZE) {
422 if (pgd_val(pgdp[pgd_idx]) == 0)
423 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
427 if (pgd_val(pgdp[pgd_idx]) == 0) {
428 next_phys = alloc_pgd_next(va);
429 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
430 nextp = get_pgd_next_virt(next_phys);
431 memset(nextp, 0, PAGE_SIZE);
433 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
434 nextp = get_pgd_next_virt(next_phys);
437 create_pgd_next_mapping(nextp, va, pa, sz, prot);
440 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
442 /* Upgrade to PMD_SIZE mappings whenever possible */
443 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
449 #ifdef CONFIG_XIP_KERNEL
450 /* called from head.S with MMU off */
451 asmlinkage void __init __copy_data(void)
453 void *from = (void *)(&_sdata);
454 void *end = (void *)(&_end);
455 void *to = (void *)CONFIG_PHYS_RAM_BASE;
456 size_t sz = (size_t)(end - from + 1);
458 memcpy(to, from, sz);
462 #ifdef CONFIG_STRICT_KERNEL_RWX
463 static __init pgprot_t pgprot_from_va(uintptr_t va)
465 if (is_va_kernel_text(va))
466 return PAGE_KERNEL_READ_EXEC;
469 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
470 * we must protect its linear mapping alias from being executed and
472 * And rodata section is marked readonly in mark_rodata_ro.
474 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
475 return PAGE_KERNEL_READ;
480 void mark_rodata_ro(void)
482 set_kernel_memory(__start_rodata, _data, set_memory_ro);
483 if (IS_ENABLED(CONFIG_64BIT))
484 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
490 static __init pgprot_t pgprot_from_va(uintptr_t va)
492 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
495 return PAGE_KERNEL_EXEC;
497 #endif /* CONFIG_STRICT_KERNEL_RWX */
500 * setup_vm() is called from head.S with MMU-off.
502 * Following requirements should be honoured for setup_vm() to work
504 * 1) It should use PC-relative addressing for accessing kernel symbols.
505 * To achieve this we always use GCC cmodel=medany.
506 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
507 * so disable compiler instrumentation when FTRACE is enabled.
509 * Currently, the above requirements are honoured by using custom CFLAGS
510 * for init.o in mm/Makefile.
513 #ifndef __riscv_cmodel_medany
514 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
517 #ifdef CONFIG_XIP_KERNEL
518 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size,
519 __always_unused bool early)
521 uintptr_t va, end_va;
523 /* Map the flash resident part */
524 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
525 for (va = kernel_map.virt_addr; va < end_va; va += map_size)
526 create_pgd_mapping(pgdir, va,
527 kernel_map.xiprom + (va - kernel_map.virt_addr),
528 map_size, PAGE_KERNEL_EXEC);
530 /* Map the data in RAM */
531 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
532 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += map_size)
533 create_pgd_mapping(pgdir, va,
534 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
535 map_size, PAGE_KERNEL);
538 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size,
541 uintptr_t va, end_va;
543 end_va = kernel_map.virt_addr + kernel_map.size;
544 for (va = kernel_map.virt_addr; va < end_va; va += map_size)
545 create_pgd_mapping(pgdir, va,
546 kernel_map.phys_addr + (va - kernel_map.virt_addr),
549 PAGE_KERNEL_EXEC : pgprot_from_va(va));
553 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
555 uintptr_t __maybe_unused pa;
557 #ifndef __PAGETABLE_PMD_FOLDED
558 pmd_t fix_bmap_spmd, fix_bmap_epmd;
561 kernel_map.virt_addr = KERNEL_LINK_ADDR;
563 #ifdef CONFIG_XIP_KERNEL
564 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
565 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
567 phys_ram_base = CONFIG_PHYS_RAM_BASE;
568 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
569 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
571 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
573 kernel_map.phys_addr = (uintptr_t)(&_start);
574 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
577 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
579 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
582 pfn_base = PFN_DOWN(kernel_map.phys_addr);
585 * Enforce boot alignment requirements of RV32 and
586 * RV64 by only allowing PMD or PGD mappings.
590 /* Sanity check alignment and size */
591 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
592 BUG_ON((kernel_map.phys_addr % map_size) != 0);
596 * The last 4K bytes of the addressable memory can not be mapped because
597 * of IS_ERR_VALUE macro.
599 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
602 pt_ops.alloc_pte = alloc_pte_early;
603 pt_ops.get_pte_virt = get_pte_virt_early;
604 #ifndef __PAGETABLE_PMD_FOLDED
605 pt_ops.alloc_pmd = alloc_pmd_early;
606 pt_ops.get_pmd_virt = get_pmd_virt_early;
608 /* Setup early PGD for fixmap */
609 create_pgd_mapping(early_pg_dir, FIXADDR_START,
610 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
612 #ifndef __PAGETABLE_PMD_FOLDED
613 /* Setup fixmap PMD */
614 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
615 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
616 /* Setup trampoline PGD and PMD */
617 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
618 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
619 #ifdef CONFIG_XIP_KERNEL
620 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
621 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
623 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
624 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
627 /* Setup trampoline PGD */
628 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
629 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
633 * Setup early PGD covering entire kernel which will allow
634 * us to reach paging_init(). We map all memory banks later
635 * in setup_vm_final() below.
637 create_kernel_page_table(early_pg_dir, map_size, true);
639 #ifndef __PAGETABLE_PMD_FOLDED
640 /* Setup early PMD for DTB */
641 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
642 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
643 #ifndef CONFIG_BUILTIN_DTB
644 /* Create two consecutive PMD mappings for FDT early scan */
645 pa = dtb_pa & ~(PMD_SIZE - 1);
646 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
647 pa, PMD_SIZE, PAGE_KERNEL);
648 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
649 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
650 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
651 #else /* CONFIG_BUILTIN_DTB */
654 * __va can't be used since it would return a linear mapping address
655 * whereas dtb_early_va will be used before setup_vm_final installs
656 * the linear mapping.
658 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
660 dtb_early_va = __va(dtb_pa);
661 #endif /* CONFIG_64BIT */
662 #endif /* CONFIG_BUILTIN_DTB */
664 #ifndef CONFIG_BUILTIN_DTB
665 /* Create two consecutive PGD mappings for FDT early scan */
666 pa = dtb_pa & ~(PGDIR_SIZE - 1);
667 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
668 pa, PGDIR_SIZE, PAGE_KERNEL);
669 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
670 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
671 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
672 #else /* CONFIG_BUILTIN_DTB */
674 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
676 dtb_early_va = __va(dtb_pa);
677 #endif /* CONFIG_64BIT */
678 #endif /* CONFIG_BUILTIN_DTB */
680 dtb_early_pa = dtb_pa;
683 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
684 * range can not span multiple pmds.
686 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
687 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
689 #ifndef __PAGETABLE_PMD_FOLDED
691 * Early ioremap fixmap is already created as it lies within first 2MB
692 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
693 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
696 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
697 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
698 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
700 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
701 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
702 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
703 fix_to_virt(FIX_BTMAP_BEGIN));
704 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
705 fix_to_virt(FIX_BTMAP_END));
707 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
708 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
713 static void __init setup_vm_final(void)
715 uintptr_t va, map_size;
716 phys_addr_t pa, start, end;
720 * MMU is enabled at this point. But page table setup is not complete yet.
721 * fixmap page table alloc functions should be used at this point
723 pt_ops.alloc_pte = alloc_pte_fixmap;
724 pt_ops.get_pte_virt = get_pte_virt_fixmap;
725 #ifndef __PAGETABLE_PMD_FOLDED
726 pt_ops.alloc_pmd = alloc_pmd_fixmap;
727 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
729 /* Setup swapper PGD for fixmap */
730 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
731 __pa_symbol(fixmap_pgd_next),
732 PGDIR_SIZE, PAGE_TABLE);
734 /* Map all memory banks in the linear mapping */
735 for_each_mem_range(i, &start, &end) {
738 if (start <= __pa(PAGE_OFFSET) &&
739 __pa(PAGE_OFFSET) < end)
740 start = __pa(PAGE_OFFSET);
741 if (end >= __pa(PAGE_OFFSET) + memory_limit)
742 end = __pa(PAGE_OFFSET) + memory_limit;
744 map_size = best_map_size(start, end - start);
745 for (pa = start; pa < end; pa += map_size) {
746 va = (uintptr_t)__va(pa);
748 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
755 create_kernel_page_table(swapper_pg_dir, PMD_SIZE, false);
758 /* Clear fixmap PTE and PMD mappings */
759 clear_fixmap(FIX_PTE);
760 clear_fixmap(FIX_PMD);
762 /* Move to swapper page table */
763 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
764 local_flush_tlb_all();
766 /* generic page allocation functions must be used to setup page table */
767 pt_ops.alloc_pte = alloc_pte_late;
768 pt_ops.get_pte_virt = get_pte_virt_late;
769 #ifndef __PAGETABLE_PMD_FOLDED
770 pt_ops.alloc_pmd = alloc_pmd_late;
771 pt_ops.get_pmd_virt = get_pmd_virt_late;
775 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
777 dtb_early_va = (void *)dtb_pa;
778 dtb_early_pa = dtb_pa;
781 static inline void setup_vm_final(void)
784 #endif /* CONFIG_MMU */
786 #ifdef CONFIG_KEXEC_CORE
788 * reserve_crashkernel() - reserves memory for crash kernel
790 * This function reserves memory area given in "crashkernel=" kernel command
791 * line parameter. The memory reserved is used by dump capture kernel when
792 * primary kernel is crashing.
794 static void __init reserve_crashkernel(void)
796 unsigned long long crash_base = 0;
797 unsigned long long crash_size = 0;
798 unsigned long search_start = memblock_start_of_DRAM();
799 unsigned long search_end = memblock_end_of_DRAM();
804 * Don't reserve a region for a crash kernel on a crash kernel
805 * since it doesn't make much sense and we have limited memory
808 #ifdef CONFIG_CRASH_DUMP
809 if (is_kdump_kernel()) {
810 pr_info("crashkernel: ignoring reservation request\n");
815 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
816 &crash_size, &crash_base);
817 if (ret || !crash_size)
820 crash_size = PAGE_ALIGN(crash_size);
822 if (crash_base == 0) {
824 * Current riscv boot protocol requires 2MB alignment for
825 * RV64 and 4MB alignment for RV32 (hugepage size)
827 crash_base = memblock_find_in_range(search_start, search_end,
828 crash_size, PMD_SIZE);
830 if (crash_base == 0) {
831 pr_warn("crashkernel: couldn't allocate %lldKB\n",
836 /* User specifies base address explicitly. */
837 if (!memblock_is_region_memory(crash_base, crash_size)) {
838 pr_warn("crashkernel: requested region is not memory\n");
842 if (memblock_is_region_reserved(crash_base, crash_size)) {
843 pr_warn("crashkernel: requested region is reserved\n");
848 if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
849 pr_warn("crashkernel: requested region is misaligned\n");
853 memblock_reserve(crash_base, crash_size);
855 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
856 crash_base, crash_base + crash_size, crash_size >> 20);
858 crashk_res.start = crash_base;
859 crashk_res.end = crash_base + crash_size - 1;
861 #endif /* CONFIG_KEXEC_CORE */
863 #ifdef CONFIG_CRASH_DUMP
865 * We keep track of the ELF core header of the crashed
866 * kernel with a reserved-memory region with compatible
867 * string "linux,elfcorehdr". Here we register a callback
868 * to populate elfcorehdr_addr/size when this region is
869 * present. Note that this region will be marked as
870 * reserved once we call early_init_fdt_scan_reserved_mem()
873 static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
875 elfcorehdr_addr = rmem->base;
876 elfcorehdr_size = rmem->size;
880 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
883 void __init paging_init(void)
889 void __init misc_mem_init(void)
891 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
895 #ifdef CONFIG_KEXEC_CORE
896 reserve_crashkernel();
901 #ifdef CONFIG_SPARSEMEM_VMEMMAP
902 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
903 struct vmem_altmap *altmap)
905 return vmemmap_populate_basepages(start, end, node, NULL);