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 #ifdef CONFIG_XIP_KERNEL
40 extern char _xiprom[], _exiprom[];
43 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
45 EXPORT_SYMBOL(empty_zero_page);
48 #define DTB_EARLY_BASE_VA PGDIR_SIZE
49 void *_dtb_early_va __initdata;
50 uintptr_t _dtb_early_pa __initdata;
53 pte_t *(*get_pte_virt)(phys_addr_t pa);
54 phys_addr_t (*alloc_pte)(uintptr_t va);
55 #ifndef __PAGETABLE_PMD_FOLDED
56 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
57 phys_addr_t (*alloc_pmd)(uintptr_t va);
61 static phys_addr_t dma32_phys_limit __initdata;
63 static void __init zone_sizes_init(void)
65 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
67 #ifdef CONFIG_ZONE_DMA32
68 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
70 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
72 free_area_init(max_zone_pfns);
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 #ifdef CONFIG_SWIOTLB
117 if (swiotlb_force == SWIOTLB_FORCE ||
118 max_pfn > PFN_DOWN(dma32_phys_limit))
121 swiotlb_force = SWIOTLB_NO_FORCE;
123 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
130 * The default maximal physical memory size is -PAGE_OFFSET,
131 * limit the memory size via mem.
133 static phys_addr_t memory_limit = -PAGE_OFFSET;
135 static int __init early_mem(char *p)
142 size = memparse(p, &p) & PAGE_MASK;
143 memory_limit = min_t(u64, size, memory_limit);
145 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
149 early_param("mem", early_mem);
151 static void __init setup_bootmem(void)
153 phys_addr_t vmlinux_end = __pa_symbol(&_end);
154 phys_addr_t vmlinux_start = __pa_symbol(&_start);
155 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
156 phys_addr_t dram_end;
158 #ifdef CONFIG_XIP_KERNEL
159 vmlinux_start = __pa_symbol(&_sdata);
162 memblock_enforce_memory_limit(memory_limit);
165 * Reserve from the start of the kernel to the end of the kernel
167 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
169 * Make sure we align the reservation on PMD_SIZE since we will
170 * map the kernel in the linear mapping as read-only: we do not want
171 * any allocation to happen between _end and the next pmd aligned page.
173 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
175 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
177 dram_end = memblock_end_of_DRAM();
179 * memblock allocator is not aware of the fact that last 4K bytes of
180 * the addressable memory can not be mapped because of IS_ERR_VALUE
181 * macro. Make sure that last 4k bytes are not usable by memblock
182 * if end of dram is equal to maximum addressable memory.
184 if (max_mapped_addr == (dram_end - 1))
185 memblock_set_current_limit(max_mapped_addr - 4096);
187 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
188 max_low_pfn = max_pfn = PFN_DOWN(dram_end);
190 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
191 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
193 reserve_initrd_mem();
195 * If DTB is built in, no need to reserve its memblock.
196 * Otherwise, do reserve it but avoid using
197 * early_init_fdt_reserve_self() since __pa() does
198 * not work for DTB pointers that are fixmap addresses
200 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
201 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
203 early_init_fdt_scan_reserved_mem();
204 dma_contiguous_reserve(dma32_phys_limit);
205 memblock_allow_resize();
209 static struct pt_alloc_ops _pt_ops __initdata;
211 #ifdef CONFIG_XIP_KERNEL
212 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
214 #define pt_ops _pt_ops
217 unsigned long pfn_base __ro_after_init;
218 EXPORT_SYMBOL(pfn_base);
220 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
221 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
222 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
224 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
226 #ifdef CONFIG_XIP_KERNEL
227 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
228 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
229 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
230 #endif /* CONFIG_XIP_KERNEL */
232 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
234 unsigned long addr = __fix_to_virt(idx);
237 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
239 ptep = &fixmap_pte[pte_index(addr)];
241 if (pgprot_val(prot))
242 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
244 pte_clear(&init_mm, addr, ptep);
245 local_flush_tlb_page(addr);
248 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
250 return (pte_t *)((uintptr_t)pa);
253 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
255 clear_fixmap(FIX_PTE);
256 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
259 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
261 return (pte_t *) __va(pa);
264 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
267 * We only create PMD or PGD early mappings so we
268 * should never reach here with MMU disabled.
273 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
275 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
278 static phys_addr_t __init alloc_pte_late(uintptr_t va)
282 vaddr = __get_free_page(GFP_KERNEL);
283 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
288 static void __init create_pte_mapping(pte_t *ptep,
289 uintptr_t va, phys_addr_t pa,
290 phys_addr_t sz, pgprot_t prot)
292 uintptr_t pte_idx = pte_index(va);
294 BUG_ON(sz != PAGE_SIZE);
296 if (pte_none(ptep[pte_idx]))
297 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
300 #ifndef __PAGETABLE_PMD_FOLDED
302 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
303 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
304 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
305 static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
307 #ifdef CONFIG_XIP_KERNEL
308 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
309 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
310 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
311 #endif /* CONFIG_XIP_KERNEL */
313 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
315 /* Before MMU is enabled */
316 return (pmd_t *)((uintptr_t)pa);
319 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
321 clear_fixmap(FIX_PMD);
322 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
325 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
327 return (pmd_t *) __va(pa);
330 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
332 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
334 return (uintptr_t)early_pmd;
337 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
339 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
342 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
346 vaddr = __get_free_page(GFP_KERNEL);
351 static void __init create_pmd_mapping(pmd_t *pmdp,
352 uintptr_t va, phys_addr_t pa,
353 phys_addr_t sz, pgprot_t prot)
356 phys_addr_t pte_phys;
357 uintptr_t pmd_idx = pmd_index(va);
359 if (sz == PMD_SIZE) {
360 if (pmd_none(pmdp[pmd_idx]))
361 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
365 if (pmd_none(pmdp[pmd_idx])) {
366 pte_phys = pt_ops.alloc_pte(va);
367 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
368 ptep = pt_ops.get_pte_virt(pte_phys);
369 memset(ptep, 0, PAGE_SIZE);
371 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
372 ptep = pt_ops.get_pte_virt(pte_phys);
375 create_pte_mapping(ptep, va, pa, sz, prot);
378 #define pgd_next_t pmd_t
379 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
380 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
381 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
382 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
383 #define fixmap_pgd_next fixmap_pmd
385 #define pgd_next_t pte_t
386 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
387 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
388 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
389 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
390 #define fixmap_pgd_next fixmap_pte
393 void __init create_pgd_mapping(pgd_t *pgdp,
394 uintptr_t va, phys_addr_t pa,
395 phys_addr_t sz, pgprot_t prot)
398 phys_addr_t next_phys;
399 uintptr_t pgd_idx = pgd_index(va);
401 if (sz == PGDIR_SIZE) {
402 if (pgd_val(pgdp[pgd_idx]) == 0)
403 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
407 if (pgd_val(pgdp[pgd_idx]) == 0) {
408 next_phys = alloc_pgd_next(va);
409 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
410 nextp = get_pgd_next_virt(next_phys);
411 memset(nextp, 0, PAGE_SIZE);
413 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
414 nextp = get_pgd_next_virt(next_phys);
417 create_pgd_next_mapping(nextp, va, pa, sz, prot);
420 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
422 /* Upgrade to PMD_SIZE mappings whenever possible */
423 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
429 #ifdef CONFIG_XIP_KERNEL
430 /* called from head.S with MMU off */
431 asmlinkage void __init __copy_data(void)
433 void *from = (void *)(&_sdata);
434 void *end = (void *)(&_end);
435 void *to = (void *)CONFIG_PHYS_RAM_BASE;
436 size_t sz = (size_t)(end - from + 1);
438 memcpy(to, from, sz);
442 #ifdef CONFIG_STRICT_KERNEL_RWX
443 static __init pgprot_t pgprot_from_va(uintptr_t va)
445 if (is_va_kernel_text(va))
446 return PAGE_KERNEL_READ_EXEC;
449 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
450 * we must protect its linear mapping alias from being executed and
452 * And rodata section is marked readonly in mark_rodata_ro.
454 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
455 return PAGE_KERNEL_READ;
460 void mark_rodata_ro(void)
462 set_kernel_memory(__start_rodata, _data, set_memory_ro);
463 if (IS_ENABLED(CONFIG_64BIT))
464 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
470 static __init pgprot_t pgprot_from_va(uintptr_t va)
472 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
475 return PAGE_KERNEL_EXEC;
477 #endif /* CONFIG_STRICT_KERNEL_RWX */
480 * setup_vm() is called from head.S with MMU-off.
482 * Following requirements should be honoured for setup_vm() to work
484 * 1) It should use PC-relative addressing for accessing kernel symbols.
485 * To achieve this we always use GCC cmodel=medany.
486 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
487 * so disable compiler instrumentation when FTRACE is enabled.
489 * Currently, the above requirements are honoured by using custom CFLAGS
490 * for init.o in mm/Makefile.
493 #ifndef __riscv_cmodel_medany
494 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
497 #ifdef CONFIG_XIP_KERNEL
498 static void __init create_kernel_page_table(pgd_t *pgdir,
499 __always_unused bool early)
501 uintptr_t va, end_va;
503 /* Map the flash resident part */
504 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
505 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
506 create_pgd_mapping(pgdir, va,
507 kernel_map.xiprom + (va - kernel_map.virt_addr),
508 PMD_SIZE, PAGE_KERNEL_EXEC);
510 /* Map the data in RAM */
511 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
512 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
513 create_pgd_mapping(pgdir, va,
514 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
515 PMD_SIZE, PAGE_KERNEL);
518 static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
520 uintptr_t va, end_va;
522 end_va = kernel_map.virt_addr + kernel_map.size;
523 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
524 create_pgd_mapping(pgdir, va,
525 kernel_map.phys_addr + (va - kernel_map.virt_addr),
528 PAGE_KERNEL_EXEC : pgprot_from_va(va));
532 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
534 uintptr_t __maybe_unused pa;
535 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
537 kernel_map.virt_addr = KERNEL_LINK_ADDR;
539 #ifdef CONFIG_XIP_KERNEL
540 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
541 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
543 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
544 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
546 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
548 kernel_map.phys_addr = (uintptr_t)(&_start);
549 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
551 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
552 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
554 pfn_base = PFN_DOWN(kernel_map.phys_addr);
556 /* Sanity check alignment and size */
557 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
558 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
560 pt_ops.alloc_pte = alloc_pte_early;
561 pt_ops.get_pte_virt = get_pte_virt_early;
562 #ifndef __PAGETABLE_PMD_FOLDED
563 pt_ops.alloc_pmd = alloc_pmd_early;
564 pt_ops.get_pmd_virt = get_pmd_virt_early;
566 /* Setup early PGD for fixmap */
567 create_pgd_mapping(early_pg_dir, FIXADDR_START,
568 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
570 #ifndef __PAGETABLE_PMD_FOLDED
571 /* Setup fixmap PMD */
572 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
573 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
574 /* Setup trampoline PGD and PMD */
575 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
576 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
577 #ifdef CONFIG_XIP_KERNEL
578 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
579 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
581 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
582 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
585 /* Setup trampoline PGD */
586 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
587 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
591 * Setup early PGD covering entire kernel which will allow
592 * us to reach paging_init(). We map all memory banks later
593 * in setup_vm_final() below.
595 create_kernel_page_table(early_pg_dir, true);
597 #ifndef __PAGETABLE_PMD_FOLDED
598 /* Setup early PMD for DTB */
599 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
600 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
601 #ifndef CONFIG_BUILTIN_DTB
602 /* Create two consecutive PMD mappings for FDT early scan */
603 pa = dtb_pa & ~(PMD_SIZE - 1);
604 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
605 pa, PMD_SIZE, PAGE_KERNEL);
606 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
607 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
608 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
609 #else /* CONFIG_BUILTIN_DTB */
612 * __va can't be used since it would return a linear mapping address
613 * whereas dtb_early_va will be used before setup_vm_final installs
614 * the linear mapping.
616 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
618 dtb_early_va = __va(dtb_pa);
619 #endif /* CONFIG_64BIT */
620 #endif /* CONFIG_BUILTIN_DTB */
622 #ifndef CONFIG_BUILTIN_DTB
623 /* Create two consecutive PGD mappings for FDT early scan */
624 pa = dtb_pa & ~(PGDIR_SIZE - 1);
625 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
626 pa, PGDIR_SIZE, PAGE_KERNEL);
627 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
628 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
629 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
630 #else /* CONFIG_BUILTIN_DTB */
632 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
634 dtb_early_va = __va(dtb_pa);
635 #endif /* CONFIG_64BIT */
636 #endif /* CONFIG_BUILTIN_DTB */
638 dtb_early_pa = dtb_pa;
641 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
642 * range can not span multiple pmds.
644 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
645 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
647 #ifndef __PAGETABLE_PMD_FOLDED
649 * Early ioremap fixmap is already created as it lies within first 2MB
650 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
651 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
654 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
655 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
656 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
658 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
659 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
660 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
661 fix_to_virt(FIX_BTMAP_BEGIN));
662 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
663 fix_to_virt(FIX_BTMAP_END));
665 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
666 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
671 static void __init setup_vm_final(void)
673 uintptr_t va, map_size;
674 phys_addr_t pa, start, end;
678 * MMU is enabled at this point. But page table setup is not complete yet.
679 * fixmap page table alloc functions should be used at this point
681 pt_ops.alloc_pte = alloc_pte_fixmap;
682 pt_ops.get_pte_virt = get_pte_virt_fixmap;
683 #ifndef __PAGETABLE_PMD_FOLDED
684 pt_ops.alloc_pmd = alloc_pmd_fixmap;
685 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
687 /* Setup swapper PGD for fixmap */
688 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
689 __pa_symbol(fixmap_pgd_next),
690 PGDIR_SIZE, PAGE_TABLE);
692 /* Map all memory banks in the linear mapping */
693 for_each_mem_range(i, &start, &end) {
696 if (start <= __pa(PAGE_OFFSET) &&
697 __pa(PAGE_OFFSET) < end)
698 start = __pa(PAGE_OFFSET);
700 map_size = best_map_size(start, end - start);
701 for (pa = start; pa < end; pa += map_size) {
702 va = (uintptr_t)__va(pa);
704 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
711 create_kernel_page_table(swapper_pg_dir, false);
714 /* Clear fixmap PTE and PMD mappings */
715 clear_fixmap(FIX_PTE);
716 clear_fixmap(FIX_PMD);
718 /* Move to swapper page table */
719 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
720 local_flush_tlb_all();
722 /* generic page allocation functions must be used to setup page table */
723 pt_ops.alloc_pte = alloc_pte_late;
724 pt_ops.get_pte_virt = get_pte_virt_late;
725 #ifndef __PAGETABLE_PMD_FOLDED
726 pt_ops.alloc_pmd = alloc_pmd_late;
727 pt_ops.get_pmd_virt = get_pmd_virt_late;
731 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
733 dtb_early_va = (void *)dtb_pa;
734 dtb_early_pa = dtb_pa;
737 static inline void setup_vm_final(void)
740 #endif /* CONFIG_MMU */
742 #ifdef CONFIG_KEXEC_CORE
744 * reserve_crashkernel() - reserves memory for crash kernel
746 * This function reserves memory area given in "crashkernel=" kernel command
747 * line parameter. The memory reserved is used by dump capture kernel when
748 * primary kernel is crashing.
750 static void __init reserve_crashkernel(void)
752 unsigned long long crash_base = 0;
753 unsigned long long crash_size = 0;
754 unsigned long search_start = memblock_start_of_DRAM();
755 unsigned long search_end = memblock_end_of_DRAM();
760 * Don't reserve a region for a crash kernel on a crash kernel
761 * since it doesn't make much sense and we have limited memory
764 #ifdef CONFIG_CRASH_DUMP
765 if (is_kdump_kernel()) {
766 pr_info("crashkernel: ignoring reservation request\n");
771 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
772 &crash_size, &crash_base);
773 if (ret || !crash_size)
776 crash_size = PAGE_ALIGN(crash_size);
778 if (crash_base == 0) {
780 * Current riscv boot protocol requires 2MB alignment for
781 * RV64 and 4MB alignment for RV32 (hugepage size)
783 crash_base = memblock_find_in_range(search_start, search_end,
784 crash_size, PMD_SIZE);
786 if (crash_base == 0) {
787 pr_warn("crashkernel: couldn't allocate %lldKB\n",
792 /* User specifies base address explicitly. */
793 if (!memblock_is_region_memory(crash_base, crash_size)) {
794 pr_warn("crashkernel: requested region is not memory\n");
798 if (memblock_is_region_reserved(crash_base, crash_size)) {
799 pr_warn("crashkernel: requested region is reserved\n");
804 if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
805 pr_warn("crashkernel: requested region is misaligned\n");
809 memblock_reserve(crash_base, crash_size);
811 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
812 crash_base, crash_base + crash_size, crash_size >> 20);
814 crashk_res.start = crash_base;
815 crashk_res.end = crash_base + crash_size - 1;
817 #endif /* CONFIG_KEXEC_CORE */
819 #ifdef CONFIG_CRASH_DUMP
821 * We keep track of the ELF core header of the crashed
822 * kernel with a reserved-memory region with compatible
823 * string "linux,elfcorehdr". Here we register a callback
824 * to populate elfcorehdr_addr/size when this region is
825 * present. Note that this region will be marked as
826 * reserved once we call early_init_fdt_scan_reserved_mem()
829 static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
831 elfcorehdr_addr = rmem->base;
832 elfcorehdr_size = rmem->size;
836 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
839 void __init paging_init(void)
845 void __init misc_mem_init(void)
847 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
851 #ifdef CONFIG_KEXEC_CORE
852 reserve_crashkernel();
857 #ifdef CONFIG_SPARSEMEM_VMEMMAP
858 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
859 struct vmem_altmap *altmap)
861 return vmemmap_populate_basepages(start, end, node, NULL);