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>
22 #include <linux/hugetlb.h>
24 #include <asm/fixmap.h>
25 #include <asm/tlbflush.h>
26 #include <asm/sections.h>
29 #include <asm/ptdump.h>
32 #include "../kernel/head.h"
34 struct kernel_mapping kernel_map __ro_after_init;
35 EXPORT_SYMBOL(kernel_map);
36 #ifdef CONFIG_XIP_KERNEL
37 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
40 #ifdef CONFIG_XIP_KERNEL
41 extern char _xiprom[], _exiprom[];
44 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
46 EXPORT_SYMBOL(empty_zero_page);
49 #define DTB_EARLY_BASE_VA PGDIR_SIZE
50 void *_dtb_early_va __initdata;
51 uintptr_t _dtb_early_pa __initdata;
54 pte_t *(*get_pte_virt)(phys_addr_t pa);
55 phys_addr_t (*alloc_pte)(uintptr_t va);
56 #ifndef __PAGETABLE_PMD_FOLDED
57 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
58 phys_addr_t (*alloc_pmd)(uintptr_t va);
62 static phys_addr_t dma32_phys_limit __initdata;
64 static void __init zone_sizes_init(void)
66 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
68 #ifdef CONFIG_ZONE_DMA32
69 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
71 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
73 free_area_init(max_zone_pfns);
76 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
77 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
79 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
83 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
85 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
89 static void __init print_vm_layout(void)
91 pr_notice("Virtual kernel memory layout:\n");
92 print_mlk("fixmap", (unsigned long)FIXADDR_START,
93 (unsigned long)FIXADDR_TOP);
94 print_mlm("pci io", (unsigned long)PCI_IO_START,
95 (unsigned long)PCI_IO_END);
96 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
97 (unsigned long)VMEMMAP_END);
98 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
99 (unsigned long)VMALLOC_END);
100 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
101 (unsigned long)high_memory);
103 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
104 (unsigned long)ADDRESS_SPACE_END);
108 static void print_vm_layout(void) { }
109 #endif /* CONFIG_DEBUG_VM */
111 void __init mem_init(void)
113 #ifdef CONFIG_FLATMEM
115 #endif /* CONFIG_FLATMEM */
117 #ifdef CONFIG_SWIOTLB
118 if (swiotlb_force == SWIOTLB_FORCE ||
119 max_pfn > PFN_DOWN(dma32_phys_limit))
122 swiotlb_force = SWIOTLB_NO_FORCE;
124 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
131 * The default maximal physical memory size is -PAGE_OFFSET,
132 * limit the memory size via mem.
134 static phys_addr_t memory_limit = -PAGE_OFFSET;
136 static int __init early_mem(char *p)
143 size = memparse(p, &p) & PAGE_MASK;
144 memory_limit = min_t(u64, size, memory_limit);
146 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
150 early_param("mem", early_mem);
152 static void __init setup_bootmem(void)
154 phys_addr_t vmlinux_end = __pa_symbol(&_end);
155 phys_addr_t vmlinux_start = __pa_symbol(&_start);
156 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
157 phys_addr_t dram_end;
159 #ifdef CONFIG_XIP_KERNEL
160 vmlinux_start = __pa_symbol(&_sdata);
163 memblock_enforce_memory_limit(memory_limit);
166 * Reserve from the start of the kernel to the end of the kernel
168 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
170 * Make sure we align the reservation on PMD_SIZE since we will
171 * map the kernel in the linear mapping as read-only: we do not want
172 * any allocation to happen between _end and the next pmd aligned page.
174 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
176 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
178 dram_end = memblock_end_of_DRAM();
180 * memblock allocator is not aware of the fact that last 4K bytes of
181 * the addressable memory can not be mapped because of IS_ERR_VALUE
182 * macro. Make sure that last 4k bytes are not usable by memblock
183 * if end of dram is equal to maximum addressable memory.
185 if (max_mapped_addr == (dram_end - 1))
186 memblock_set_current_limit(max_mapped_addr - 4096);
188 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
189 max_low_pfn = max_pfn = PFN_DOWN(dram_end);
191 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
192 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
194 reserve_initrd_mem();
196 * If DTB is built in, no need to reserve its memblock.
197 * Otherwise, do reserve it but avoid using
198 * early_init_fdt_reserve_self() since __pa() does
199 * not work for DTB pointers that are fixmap addresses
201 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
202 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
204 early_init_fdt_scan_reserved_mem();
205 dma_contiguous_reserve(dma32_phys_limit);
206 if (IS_ENABLED(CONFIG_64BIT))
207 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
208 memblock_allow_resize();
212 static struct pt_alloc_ops _pt_ops __initdata;
214 #ifdef CONFIG_XIP_KERNEL
215 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
217 #define pt_ops _pt_ops
220 unsigned long riscv_pfn_base __ro_after_init;
221 EXPORT_SYMBOL(riscv_pfn_base);
223 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
224 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
225 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
227 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
228 static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
230 #ifdef CONFIG_XIP_KERNEL
231 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
232 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
233 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
234 #endif /* CONFIG_XIP_KERNEL */
236 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
238 unsigned long addr = __fix_to_virt(idx);
241 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
243 ptep = &fixmap_pte[pte_index(addr)];
245 if (pgprot_val(prot))
246 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
248 pte_clear(&init_mm, addr, ptep);
249 local_flush_tlb_page(addr);
252 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
254 return (pte_t *)((uintptr_t)pa);
257 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
259 clear_fixmap(FIX_PTE);
260 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
263 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
265 return (pte_t *) __va(pa);
268 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
271 * We only create PMD or PGD early mappings so we
272 * should never reach here with MMU disabled.
277 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
279 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
282 static phys_addr_t __init alloc_pte_late(uintptr_t va)
286 vaddr = __get_free_page(GFP_KERNEL);
287 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
292 static void __init create_pte_mapping(pte_t *ptep,
293 uintptr_t va, phys_addr_t pa,
294 phys_addr_t sz, pgprot_t prot)
296 uintptr_t pte_idx = pte_index(va);
298 BUG_ON(sz != PAGE_SIZE);
300 if (pte_none(ptep[pte_idx]))
301 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
304 #ifndef __PAGETABLE_PMD_FOLDED
306 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
307 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
308 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
310 #ifdef CONFIG_XIP_KERNEL
311 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
312 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
313 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
314 #endif /* CONFIG_XIP_KERNEL */
316 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
318 /* Before MMU is enabled */
319 return (pmd_t *)((uintptr_t)pa);
322 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
324 clear_fixmap(FIX_PMD);
325 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
328 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
330 return (pmd_t *) __va(pa);
333 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
335 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
337 return (uintptr_t)early_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 __init 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
394 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot)
397 void __init create_pgd_mapping(pgd_t *pgdp,
398 uintptr_t va, phys_addr_t pa,
399 phys_addr_t sz, pgprot_t prot)
402 phys_addr_t next_phys;
403 uintptr_t pgd_idx = pgd_index(va);
405 if (sz == PGDIR_SIZE) {
406 if (pgd_val(pgdp[pgd_idx]) == 0)
407 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
411 if (pgd_val(pgdp[pgd_idx]) == 0) {
412 next_phys = alloc_pgd_next(va);
413 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
414 nextp = get_pgd_next_virt(next_phys);
415 memset(nextp, 0, PAGE_SIZE);
417 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
418 nextp = get_pgd_next_virt(next_phys);
421 create_pgd_next_mapping(nextp, va, pa, sz, prot);
424 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
426 /* Upgrade to PMD_SIZE mappings whenever possible */
427 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
433 #ifdef CONFIG_XIP_KERNEL
434 /* called from head.S with MMU off */
435 asmlinkage void __init __copy_data(void)
437 void *from = (void *)(&_sdata);
438 void *end = (void *)(&_end);
439 void *to = (void *)CONFIG_PHYS_RAM_BASE;
440 size_t sz = (size_t)(end - from + 1);
442 memcpy(to, from, sz);
446 #ifdef CONFIG_STRICT_KERNEL_RWX
447 static __init pgprot_t pgprot_from_va(uintptr_t va)
449 if (is_va_kernel_text(va))
450 return PAGE_KERNEL_READ_EXEC;
453 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
454 * we must protect its linear mapping alias from being executed and
456 * And rodata section is marked readonly in mark_rodata_ro.
458 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
459 return PAGE_KERNEL_READ;
464 void mark_rodata_ro(void)
466 set_kernel_memory(__start_rodata, _data, set_memory_ro);
467 if (IS_ENABLED(CONFIG_64BIT))
468 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
474 static __init pgprot_t pgprot_from_va(uintptr_t va)
476 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
479 return PAGE_KERNEL_EXEC;
481 #endif /* CONFIG_STRICT_KERNEL_RWX */
484 * setup_vm() is called from head.S with MMU-off.
486 * Following requirements should be honoured for setup_vm() to work
488 * 1) It should use PC-relative addressing for accessing kernel symbols.
489 * To achieve this we always use GCC cmodel=medany.
490 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
491 * so disable compiler instrumentation when FTRACE is enabled.
493 * Currently, the above requirements are honoured by using custom CFLAGS
494 * for init.o in mm/Makefile.
497 #ifndef __riscv_cmodel_medany
498 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
501 #ifdef CONFIG_XIP_KERNEL
502 static void __init create_kernel_page_table(pgd_t *pgdir,
503 __always_unused bool early)
505 uintptr_t va, end_va;
507 /* Map the flash resident part */
508 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
509 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
510 create_pgd_mapping(pgdir, va,
511 kernel_map.xiprom + (va - kernel_map.virt_addr),
512 PMD_SIZE, PAGE_KERNEL_EXEC);
514 /* Map the data in RAM */
515 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
516 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
517 create_pgd_mapping(pgdir, va,
518 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
519 PMD_SIZE, PAGE_KERNEL);
522 static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
524 uintptr_t va, end_va;
526 end_va = kernel_map.virt_addr + kernel_map.size;
527 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
528 create_pgd_mapping(pgdir, va,
529 kernel_map.phys_addr + (va - kernel_map.virt_addr),
532 PAGE_KERNEL_EXEC : pgprot_from_va(va));
537 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
538 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
541 static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
543 #ifndef CONFIG_BUILTIN_DTB
544 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
546 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
547 IS_ENABLED(CONFIG_64BIT) ? (uintptr_t)early_dtb_pmd : pa,
549 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
551 if (IS_ENABLED(CONFIG_64BIT)) {
552 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
553 pa, PMD_SIZE, PAGE_KERNEL);
554 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
555 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
558 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
561 * For 64-bit kernel, __va can't be used since it would return a linear
562 * mapping address whereas dtb_early_va will be used before
563 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
564 * kernel is mapped in the linear mapping, that makes no difference.
566 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
569 dtb_early_pa = dtb_pa;
572 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
574 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
576 kernel_map.virt_addr = KERNEL_LINK_ADDR;
578 #ifdef CONFIG_XIP_KERNEL
579 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
580 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
582 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
583 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
585 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
587 kernel_map.phys_addr = (uintptr_t)(&_start);
588 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
590 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
591 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
593 riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr);
595 /* Sanity check alignment and size */
596 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
597 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
599 pt_ops.alloc_pte = alloc_pte_early;
600 pt_ops.get_pte_virt = get_pte_virt_early;
601 #ifndef __PAGETABLE_PMD_FOLDED
602 pt_ops.alloc_pmd = alloc_pmd_early;
603 pt_ops.get_pmd_virt = get_pmd_virt_early;
605 /* Setup early PGD for fixmap */
606 create_pgd_mapping(early_pg_dir, FIXADDR_START,
607 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
609 #ifndef __PAGETABLE_PMD_FOLDED
610 /* Setup fixmap PMD */
611 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
612 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
613 /* Setup trampoline PGD and PMD */
614 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
615 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
616 #ifdef CONFIG_XIP_KERNEL
617 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
618 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
620 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
621 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
624 /* Setup trampoline PGD */
625 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
626 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
630 * Setup early PGD covering entire kernel which will allow
631 * us to reach paging_init(). We map all memory banks later
632 * in setup_vm_final() below.
634 create_kernel_page_table(early_pg_dir, true);
636 /* Setup early mapping for FDT early scan */
637 create_fdt_early_page_table(early_pg_dir, dtb_pa);
640 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
641 * range can not span multiple pmds.
643 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
644 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
646 #ifndef __PAGETABLE_PMD_FOLDED
648 * Early ioremap fixmap is already created as it lies within first 2MB
649 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
650 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
653 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
654 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
655 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
657 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
658 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
659 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
660 fix_to_virt(FIX_BTMAP_BEGIN));
661 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
662 fix_to_virt(FIX_BTMAP_END));
664 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
665 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
670 static void __init setup_vm_final(void)
672 uintptr_t va, map_size;
673 phys_addr_t pa, start, end;
677 * MMU is enabled at this point. But page table setup is not complete yet.
678 * fixmap page table alloc functions should be used at this point
680 pt_ops.alloc_pte = alloc_pte_fixmap;
681 pt_ops.get_pte_virt = get_pte_virt_fixmap;
682 #ifndef __PAGETABLE_PMD_FOLDED
683 pt_ops.alloc_pmd = alloc_pmd_fixmap;
684 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
686 /* Setup swapper PGD for fixmap */
687 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
688 __pa_symbol(fixmap_pgd_next),
689 PGDIR_SIZE, PAGE_TABLE);
691 /* Map all memory banks in the linear mapping */
692 for_each_mem_range(i, &start, &end) {
695 if (start <= __pa(PAGE_OFFSET) &&
696 __pa(PAGE_OFFSET) < end)
697 start = __pa(PAGE_OFFSET);
699 map_size = best_map_size(start, end - start);
700 for (pa = start; pa < end; pa += map_size) {
701 va = (uintptr_t)__va(pa);
703 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
710 create_kernel_page_table(swapper_pg_dir, false);
713 /* Clear fixmap PTE and PMD mappings */
714 clear_fixmap(FIX_PTE);
715 clear_fixmap(FIX_PMD);
717 /* Move to swapper page table */
718 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
719 local_flush_tlb_all();
721 /* generic page allocation functions must be used to setup page table */
722 pt_ops.alloc_pte = alloc_pte_late;
723 pt_ops.get_pte_virt = get_pte_virt_late;
724 #ifndef __PAGETABLE_PMD_FOLDED
725 pt_ops.alloc_pmd = alloc_pmd_late;
726 pt_ops.get_pmd_virt = get_pmd_virt_late;
730 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
732 dtb_early_va = (void *)dtb_pa;
733 dtb_early_pa = dtb_pa;
736 static inline void setup_vm_final(void)
739 #endif /* CONFIG_MMU */
741 #ifdef CONFIG_KEXEC_CORE
743 * reserve_crashkernel() - reserves memory for crash kernel
745 * This function reserves memory area given in "crashkernel=" kernel command
746 * line parameter. The memory reserved is used by dump capture kernel when
747 * primary kernel is crashing.
749 static void __init reserve_crashkernel(void)
751 unsigned long long crash_base = 0;
752 unsigned long long crash_size = 0;
753 unsigned long search_start = memblock_start_of_DRAM();
754 unsigned long search_end = memblock_end_of_DRAM();
759 * Don't reserve a region for a crash kernel on a crash kernel
760 * since it doesn't make much sense and we have limited memory
763 #ifdef CONFIG_CRASH_DUMP
764 if (is_kdump_kernel()) {
765 pr_info("crashkernel: ignoring reservation request\n");
770 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
771 &crash_size, &crash_base);
772 if (ret || !crash_size)
775 crash_size = PAGE_ALIGN(crash_size);
777 if (crash_base == 0) {
779 * Current riscv boot protocol requires 2MB alignment for
780 * RV64 and 4MB alignment for RV32 (hugepage size)
782 crash_base = memblock_find_in_range(search_start, search_end,
783 crash_size, PMD_SIZE);
785 if (crash_base == 0) {
786 pr_warn("crashkernel: couldn't allocate %lldKB\n",
791 /* User specifies base address explicitly. */
792 if (!memblock_is_region_memory(crash_base, crash_size)) {
793 pr_warn("crashkernel: requested region is not memory\n");
797 if (memblock_is_region_reserved(crash_base, crash_size)) {
798 pr_warn("crashkernel: requested region is reserved\n");
803 if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
804 pr_warn("crashkernel: requested region is misaligned\n");
808 memblock_reserve(crash_base, crash_size);
810 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
811 crash_base, crash_base + crash_size, crash_size >> 20);
813 crashk_res.start = crash_base;
814 crashk_res.end = crash_base + crash_size - 1;
816 #endif /* CONFIG_KEXEC_CORE */
818 #ifdef CONFIG_CRASH_DUMP
820 * We keep track of the ELF core header of the crashed
821 * kernel with a reserved-memory region with compatible
822 * string "linux,elfcorehdr". Here we register a callback
823 * to populate elfcorehdr_addr/size when this region is
824 * present. Note that this region will be marked as
825 * reserved once we call early_init_fdt_scan_reserved_mem()
828 static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
830 elfcorehdr_addr = rmem->base;
831 elfcorehdr_size = rmem->size;
835 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
838 void __init paging_init(void)
844 void __init misc_mem_init(void)
846 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
850 #ifdef CONFIG_KEXEC_CORE
851 reserve_crashkernel();
856 #ifdef CONFIG_SPARSEMEM_VMEMMAP
857 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
858 struct vmem_altmap *altmap)
860 return vmemmap_populate_basepages(start, end, node, NULL);