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 unsigned long kernel_virt_addr = KERNEL_LINK_ADDR;
34 EXPORT_SYMBOL(kernel_virt_addr);
35 #ifdef CONFIG_XIP_KERNEL
36 #define kernel_virt_addr (*((unsigned long *)XIP_FIXUP(&kernel_virt_addr)))
37 extern char _xiprom[], _exiprom[];
40 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
42 EXPORT_SYMBOL(empty_zero_page);
45 #define DTB_EARLY_BASE_VA PGDIR_SIZE
46 void *_dtb_early_va __initdata;
47 uintptr_t _dtb_early_pa __initdata;
50 pte_t *(*get_pte_virt)(phys_addr_t pa);
51 phys_addr_t (*alloc_pte)(uintptr_t va);
52 #ifndef __PAGETABLE_PMD_FOLDED
53 pmd_t *(*get_pmd_virt)(phys_addr_t pa);
54 phys_addr_t (*alloc_pmd)(uintptr_t va);
58 static phys_addr_t dma32_phys_limit __initdata;
60 static void __init zone_sizes_init(void)
62 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
64 #ifdef CONFIG_ZONE_DMA32
65 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
67 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
69 free_area_init(max_zone_pfns);
72 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
73 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
75 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
79 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
81 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
85 static void __init print_vm_layout(void)
87 pr_notice("Virtual kernel memory layout:\n");
88 print_mlk("fixmap", (unsigned long)FIXADDR_START,
89 (unsigned long)FIXADDR_TOP);
90 print_mlm("pci io", (unsigned long)PCI_IO_START,
91 (unsigned long)PCI_IO_END);
92 print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
93 (unsigned long)VMEMMAP_END);
94 print_mlm("vmalloc", (unsigned long)VMALLOC_START,
95 (unsigned long)VMALLOC_END);
96 print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
97 (unsigned long)high_memory);
99 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
100 (unsigned long)ADDRESS_SPACE_END);
104 static void print_vm_layout(void) { }
105 #endif /* CONFIG_DEBUG_VM */
107 void __init mem_init(void)
109 #ifdef CONFIG_FLATMEM
111 #endif /* CONFIG_FLATMEM */
113 #ifdef CONFIG_SWIOTLB
114 if (swiotlb_force == SWIOTLB_FORCE ||
115 max_pfn > PFN_DOWN(dma32_phys_limit))
118 swiotlb_force = SWIOTLB_NO_FORCE;
120 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
127 * The default maximal physical memory size is -PAGE_OFFSET,
128 * limit the memory size via mem.
130 static phys_addr_t memory_limit = -PAGE_OFFSET;
132 static int __init early_mem(char *p)
139 size = memparse(p, &p) & PAGE_MASK;
140 memory_limit = min_t(u64, size, memory_limit);
142 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
146 early_param("mem", early_mem);
148 static void __init setup_bootmem(void)
150 phys_addr_t vmlinux_end = __pa_symbol(&_end);
151 phys_addr_t vmlinux_start = __pa_symbol(&_start);
152 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
153 phys_addr_t dram_end;
155 #ifdef CONFIG_XIP_KERNEL
156 vmlinux_start = __pa_symbol(&_sdata);
159 memblock_enforce_memory_limit(memory_limit);
162 * Reserve from the start of the kernel to the end of the kernel
164 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
166 * Make sure we align the reservation on PMD_SIZE since we will
167 * map the kernel in the linear mapping as read-only: we do not want
168 * any allocation to happen between _end and the next pmd aligned page.
170 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
172 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
174 dram_end = memblock_end_of_DRAM();
176 * memblock allocator is not aware of the fact that last 4K bytes of
177 * the addressable memory can not be mapped because of IS_ERR_VALUE
178 * macro. Make sure that last 4k bytes are not usable by memblock
179 * if end of dram is equal to maximum addressable memory.
181 if (max_mapped_addr == (dram_end - 1))
182 memblock_set_current_limit(max_mapped_addr - 4096);
184 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
185 max_low_pfn = max_pfn = PFN_DOWN(dram_end);
187 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
188 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
190 reserve_initrd_mem();
192 * If DTB is built in, no need to reserve its memblock.
193 * Otherwise, do reserve it but avoid using
194 * early_init_fdt_reserve_self() since __pa() does
195 * not work for DTB pointers that are fixmap addresses
197 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
198 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
200 early_init_fdt_scan_reserved_mem();
201 dma_contiguous_reserve(dma32_phys_limit);
202 memblock_allow_resize();
206 static struct pt_alloc_ops _pt_ops __initdata;
208 #ifdef CONFIG_XIP_KERNEL
209 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
211 #define pt_ops _pt_ops
214 /* Offset between linear mapping virtual address and kernel load address */
215 unsigned long va_pa_offset __ro_after_init;
216 EXPORT_SYMBOL(va_pa_offset);
217 #ifdef CONFIG_XIP_KERNEL
218 #define va_pa_offset (*((unsigned long *)XIP_FIXUP(&va_pa_offset)))
220 /* Offset between kernel mapping virtual address and kernel load address */
222 unsigned long va_kernel_pa_offset __ro_after_init;
223 EXPORT_SYMBOL(va_kernel_pa_offset);
225 #ifdef CONFIG_XIP_KERNEL
226 #define va_kernel_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_pa_offset)))
228 unsigned long va_kernel_xip_pa_offset __ro_after_init;
229 EXPORT_SYMBOL(va_kernel_xip_pa_offset);
230 #ifdef CONFIG_XIP_KERNEL
231 #define va_kernel_xip_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_xip_pa_offset)))
233 unsigned long pfn_base __ro_after_init;
234 EXPORT_SYMBOL(pfn_base);
236 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
237 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
238 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
240 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
242 #ifdef CONFIG_XIP_KERNEL
243 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
244 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
245 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
246 #endif /* CONFIG_XIP_KERNEL */
248 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
250 unsigned long addr = __fix_to_virt(idx);
253 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
255 ptep = &fixmap_pte[pte_index(addr)];
257 if (pgprot_val(prot))
258 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
260 pte_clear(&init_mm, addr, ptep);
261 local_flush_tlb_page(addr);
264 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
266 return (pte_t *)((uintptr_t)pa);
269 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
271 clear_fixmap(FIX_PTE);
272 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
275 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
277 return (pte_t *) __va(pa);
280 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
283 * We only create PMD or PGD early mappings so we
284 * should never reach here with MMU disabled.
289 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
291 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
294 static phys_addr_t __init alloc_pte_late(uintptr_t va)
298 vaddr = __get_free_page(GFP_KERNEL);
299 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
304 static void __init create_pte_mapping(pte_t *ptep,
305 uintptr_t va, phys_addr_t pa,
306 phys_addr_t sz, pgprot_t prot)
308 uintptr_t pte_idx = pte_index(va);
310 BUG_ON(sz != PAGE_SIZE);
312 if (pte_none(ptep[pte_idx]))
313 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
316 #ifndef __PAGETABLE_PMD_FOLDED
318 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
319 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
320 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
321 static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
323 #ifdef CONFIG_XIP_KERNEL
324 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
325 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
326 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
327 #endif /* CONFIG_XIP_KERNEL */
329 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
331 /* Before MMU is enabled */
332 return (pmd_t *)((uintptr_t)pa);
335 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
337 clear_fixmap(FIX_PMD);
338 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
341 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
343 return (pmd_t *) __va(pa);
346 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
348 BUG_ON((va - kernel_virt_addr) >> PGDIR_SHIFT);
350 return (uintptr_t)early_pmd;
353 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
355 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
358 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
362 vaddr = __get_free_page(GFP_KERNEL);
367 static void __init create_pmd_mapping(pmd_t *pmdp,
368 uintptr_t va, phys_addr_t pa,
369 phys_addr_t sz, pgprot_t prot)
372 phys_addr_t pte_phys;
373 uintptr_t pmd_idx = pmd_index(va);
375 if (sz == PMD_SIZE) {
376 if (pmd_none(pmdp[pmd_idx]))
377 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
381 if (pmd_none(pmdp[pmd_idx])) {
382 pte_phys = pt_ops.alloc_pte(va);
383 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
384 ptep = pt_ops.get_pte_virt(pte_phys);
385 memset(ptep, 0, PAGE_SIZE);
387 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
388 ptep = pt_ops.get_pte_virt(pte_phys);
391 create_pte_mapping(ptep, va, pa, sz, prot);
394 #define pgd_next_t pmd_t
395 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
396 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
397 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
398 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
399 #define fixmap_pgd_next fixmap_pmd
401 #define pgd_next_t pte_t
402 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
403 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
404 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
405 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
406 #define fixmap_pgd_next fixmap_pte
409 void __init create_pgd_mapping(pgd_t *pgdp,
410 uintptr_t va, phys_addr_t pa,
411 phys_addr_t sz, pgprot_t prot)
414 phys_addr_t next_phys;
415 uintptr_t pgd_idx = pgd_index(va);
417 if (sz == PGDIR_SIZE) {
418 if (pgd_val(pgdp[pgd_idx]) == 0)
419 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
423 if (pgd_val(pgdp[pgd_idx]) == 0) {
424 next_phys = alloc_pgd_next(va);
425 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
426 nextp = get_pgd_next_virt(next_phys);
427 memset(nextp, 0, PAGE_SIZE);
429 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
430 nextp = get_pgd_next_virt(next_phys);
433 create_pgd_next_mapping(nextp, va, pa, sz, prot);
436 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
438 /* Upgrade to PMD_SIZE mappings whenever possible */
439 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
445 #ifdef CONFIG_XIP_KERNEL
446 /* called from head.S with MMU off */
447 asmlinkage void __init __copy_data(void)
449 void *from = (void *)(&_sdata);
450 void *end = (void *)(&_end);
451 void *to = (void *)CONFIG_PHYS_RAM_BASE;
452 size_t sz = (size_t)(end - from + 1);
454 memcpy(to, from, sz);
458 #ifdef CONFIG_STRICT_KERNEL_RWX
459 static __init pgprot_t pgprot_from_va(uintptr_t va)
461 if (is_va_kernel_text(va))
462 return PAGE_KERNEL_READ_EXEC;
465 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
466 * we must protect its linear mapping alias from being executed and
468 * And rodata section is marked readonly in mark_rodata_ro.
470 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
471 return PAGE_KERNEL_READ;
476 void mark_rodata_ro(void)
478 set_kernel_memory(__start_rodata, _data, set_memory_ro);
479 if (IS_ENABLED(CONFIG_64BIT))
480 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
486 static __init pgprot_t pgprot_from_va(uintptr_t va)
488 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
491 return PAGE_KERNEL_EXEC;
493 #endif /* CONFIG_STRICT_KERNEL_RWX */
496 * setup_vm() is called from head.S with MMU-off.
498 * Following requirements should be honoured for setup_vm() to work
500 * 1) It should use PC-relative addressing for accessing kernel symbols.
501 * To achieve this we always use GCC cmodel=medany.
502 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
503 * so disable compiler instrumentation when FTRACE is enabled.
505 * Currently, the above requirements are honoured by using custom CFLAGS
506 * for init.o in mm/Makefile.
509 #ifndef __riscv_cmodel_medany
510 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
513 static uintptr_t load_pa __initdata;
515 #ifdef CONFIG_XIP_KERNEL
516 #define load_pa (*((uintptr_t *)XIP_FIXUP(&load_pa)))
517 #define load_sz (*((uintptr_t *)XIP_FIXUP(&load_sz)))
520 #ifdef CONFIG_XIP_KERNEL
521 static uintptr_t xiprom __initdata;
522 static uintptr_t xiprom_sz __initdata;
523 #define xiprom_sz (*((uintptr_t *)XIP_FIXUP(&xiprom_sz)))
524 #define xiprom (*((uintptr_t *)XIP_FIXUP(&xiprom)))
526 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size,
527 __always_unused bool early)
529 uintptr_t va, end_va;
531 /* Map the flash resident part */
532 end_va = kernel_virt_addr + xiprom_sz;
533 for (va = kernel_virt_addr; va < end_va; va += map_size)
534 create_pgd_mapping(pgdir, va,
535 xiprom + (va - kernel_virt_addr),
536 map_size, PAGE_KERNEL_EXEC);
538 /* Map the data in RAM */
539 end_va = kernel_virt_addr + XIP_OFFSET + load_sz;
540 for (va = kernel_virt_addr + XIP_OFFSET; va < end_va; va += map_size)
541 create_pgd_mapping(pgdir, va,
542 load_pa + (va - (kernel_virt_addr + XIP_OFFSET)),
543 map_size, PAGE_KERNEL);
546 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size,
549 uintptr_t va, end_va;
551 end_va = kernel_virt_addr + load_sz;
552 for (va = kernel_virt_addr; va < end_va; va += map_size)
553 create_pgd_mapping(pgdir, va,
554 load_pa + (va - kernel_virt_addr),
557 PAGE_KERNEL_EXEC : pgprot_from_va(va));
561 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
563 uintptr_t __maybe_unused pa;
565 #ifndef __PAGETABLE_PMD_FOLDED
566 pmd_t fix_bmap_spmd, fix_bmap_epmd;
569 #ifdef CONFIG_XIP_KERNEL
570 xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
571 xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
573 load_pa = (uintptr_t)CONFIG_PHYS_RAM_BASE;
574 load_sz = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
576 va_kernel_xip_pa_offset = kernel_virt_addr - xiprom;
578 load_pa = (uintptr_t)(&_start);
579 load_sz = (uintptr_t)(&_end) - load_pa;
582 va_pa_offset = PAGE_OFFSET - load_pa;
584 va_kernel_pa_offset = kernel_virt_addr - load_pa;
587 pfn_base = PFN_DOWN(load_pa);
590 * Enforce boot alignment requirements of RV32 and
591 * RV64 by only allowing PMD or PGD mappings.
595 /* Sanity check alignment and size */
596 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
597 BUG_ON((load_pa % map_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_virt_addr,
615 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
616 #ifdef CONFIG_XIP_KERNEL
617 create_pmd_mapping(trampoline_pmd, kernel_virt_addr,
618 xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
620 create_pmd_mapping(trampoline_pmd, kernel_virt_addr,
621 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
624 /* Setup trampoline PGD */
625 create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr,
626 load_pa, 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, map_size, true);
636 #ifndef __PAGETABLE_PMD_FOLDED
637 /* Setup early PMD for DTB */
638 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
639 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
640 #ifndef CONFIG_BUILTIN_DTB
641 /* Create two consecutive PMD mappings for FDT early scan */
642 pa = dtb_pa & ~(PMD_SIZE - 1);
643 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
644 pa, PMD_SIZE, PAGE_KERNEL);
645 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
646 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
647 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
648 #else /* CONFIG_BUILTIN_DTB */
651 * __va can't be used since it would return a linear mapping address
652 * whereas dtb_early_va will be used before setup_vm_final installs
653 * the linear mapping.
655 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
657 dtb_early_va = __va(dtb_pa);
658 #endif /* CONFIG_64BIT */
659 #endif /* CONFIG_BUILTIN_DTB */
661 #ifndef CONFIG_BUILTIN_DTB
662 /* Create two consecutive PGD mappings for FDT early scan */
663 pa = dtb_pa & ~(PGDIR_SIZE - 1);
664 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
665 pa, PGDIR_SIZE, PAGE_KERNEL);
666 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
667 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
668 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
669 #else /* CONFIG_BUILTIN_DTB */
671 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
673 dtb_early_va = __va(dtb_pa);
674 #endif /* CONFIG_64BIT */
675 #endif /* CONFIG_BUILTIN_DTB */
677 dtb_early_pa = dtb_pa;
680 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
681 * range can not span multiple pmds.
683 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
684 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
686 #ifndef __PAGETABLE_PMD_FOLDED
688 * Early ioremap fixmap is already created as it lies within first 2MB
689 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
690 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
693 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
694 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
695 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
697 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
698 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
699 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
700 fix_to_virt(FIX_BTMAP_BEGIN));
701 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
702 fix_to_virt(FIX_BTMAP_END));
704 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
705 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
710 static void __init setup_vm_final(void)
712 uintptr_t va, map_size;
713 phys_addr_t pa, start, end;
717 * MMU is enabled at this point. But page table setup is not complete yet.
718 * fixmap page table alloc functions should be used at this point
720 pt_ops.alloc_pte = alloc_pte_fixmap;
721 pt_ops.get_pte_virt = get_pte_virt_fixmap;
722 #ifndef __PAGETABLE_PMD_FOLDED
723 pt_ops.alloc_pmd = alloc_pmd_fixmap;
724 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
726 /* Setup swapper PGD for fixmap */
727 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
728 __pa_symbol(fixmap_pgd_next),
729 PGDIR_SIZE, PAGE_TABLE);
731 /* Map all memory banks in the linear mapping */
732 for_each_mem_range(i, &start, &end) {
735 if (start <= __pa(PAGE_OFFSET) &&
736 __pa(PAGE_OFFSET) < end)
737 start = __pa(PAGE_OFFSET);
739 map_size = best_map_size(start, end - start);
740 for (pa = start; pa < end; pa += map_size) {
741 va = (uintptr_t)__va(pa);
743 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
750 create_kernel_page_table(swapper_pg_dir, PMD_SIZE, false);
753 /* Clear fixmap PTE and PMD mappings */
754 clear_fixmap(FIX_PTE);
755 clear_fixmap(FIX_PMD);
757 /* Move to swapper page table */
758 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
759 local_flush_tlb_all();
761 /* generic page allocation functions must be used to setup page table */
762 pt_ops.alloc_pte = alloc_pte_late;
763 pt_ops.get_pte_virt = get_pte_virt_late;
764 #ifndef __PAGETABLE_PMD_FOLDED
765 pt_ops.alloc_pmd = alloc_pmd_late;
766 pt_ops.get_pmd_virt = get_pmd_virt_late;
770 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
772 dtb_early_va = (void *)dtb_pa;
773 dtb_early_pa = dtb_pa;
776 static inline void setup_vm_final(void)
779 #endif /* CONFIG_MMU */
781 #ifdef CONFIG_KEXEC_CORE
783 * reserve_crashkernel() - reserves memory for crash kernel
785 * This function reserves memory area given in "crashkernel=" kernel command
786 * line parameter. The memory reserved is used by dump capture kernel when
787 * primary kernel is crashing.
789 static void __init reserve_crashkernel(void)
791 unsigned long long crash_base = 0;
792 unsigned long long crash_size = 0;
793 unsigned long search_start = memblock_start_of_DRAM();
794 unsigned long search_end = memblock_end_of_DRAM();
799 * Don't reserve a region for a crash kernel on a crash kernel
800 * since it doesn't make much sense and we have limited memory
803 #ifdef CONFIG_CRASH_DUMP
804 if (is_kdump_kernel()) {
805 pr_info("crashkernel: ignoring reservation request\n");
810 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
811 &crash_size, &crash_base);
812 if (ret || !crash_size)
815 crash_size = PAGE_ALIGN(crash_size);
817 if (crash_base == 0) {
819 * Current riscv boot protocol requires 2MB alignment for
820 * RV64 and 4MB alignment for RV32 (hugepage size)
822 crash_base = memblock_find_in_range(search_start, search_end,
823 crash_size, PMD_SIZE);
825 if (crash_base == 0) {
826 pr_warn("crashkernel: couldn't allocate %lldKB\n",
831 /* User specifies base address explicitly. */
832 if (!memblock_is_region_memory(crash_base, crash_size)) {
833 pr_warn("crashkernel: requested region is not memory\n");
837 if (memblock_is_region_reserved(crash_base, crash_size)) {
838 pr_warn("crashkernel: requested region is reserved\n");
843 if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
844 pr_warn("crashkernel: requested region is misaligned\n");
848 memblock_reserve(crash_base, crash_size);
850 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
851 crash_base, crash_base + crash_size, crash_size >> 20);
853 crashk_res.start = crash_base;
854 crashk_res.end = crash_base + crash_size - 1;
856 #endif /* CONFIG_KEXEC_CORE */
858 #ifdef CONFIG_CRASH_DUMP
860 * We keep track of the ELF core header of the crashed
861 * kernel with a reserved-memory region with compatible
862 * string "linux,elfcorehdr". Here we register a callback
863 * to populate elfcorehdr_addr/size when this region is
864 * present. Note that this region will be marked as
865 * reserved once we call early_init_fdt_scan_reserved_mem()
868 static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
870 elfcorehdr_addr = rmem->base;
871 elfcorehdr_size = rmem->size;
875 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
878 void __init paging_init(void)
884 void __init misc_mem_init(void)
886 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
890 #ifdef CONFIG_KEXEC_CORE
891 reserve_crashkernel();
896 #ifdef CONFIG_SPARSEMEM_VMEMMAP
897 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
898 struct vmem_altmap *altmap)
900 return vmemmap_populate_basepages(start, end, node, NULL);