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>
23 #ifdef CONFIG_RELOCATABLE
24 #include <linux/elf.h>
26 #include <linux/kfence.h>
28 #include <asm/fixmap.h>
31 #include <asm/pgtable.h>
32 #include <asm/ptdump.h>
33 #include <asm/sections.h>
35 #include <asm/tlbflush.h>
37 #include "../kernel/head.h"
39 struct kernel_mapping kernel_map __ro_after_init;
40 EXPORT_SYMBOL(kernel_map);
41 #ifdef CONFIG_XIP_KERNEL
42 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
46 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39;
48 u64 satp_mode __ro_after_init = SATP_MODE_32;
50 EXPORT_SYMBOL(satp_mode);
52 bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
53 bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
54 EXPORT_SYMBOL(pgtable_l4_enabled);
55 EXPORT_SYMBOL(pgtable_l5_enabled);
57 phys_addr_t phys_ram_base __ro_after_init;
58 EXPORT_SYMBOL(phys_ram_base);
60 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
62 EXPORT_SYMBOL(empty_zero_page);
65 void *_dtb_early_va __initdata;
66 uintptr_t _dtb_early_pa __initdata;
68 static phys_addr_t dma32_phys_limit __initdata;
70 static void __init zone_sizes_init(void)
72 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
74 #ifdef CONFIG_ZONE_DMA32
75 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
77 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
79 free_area_init(max_zone_pfns);
82 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
84 #define LOG2_SZ_1K ilog2(SZ_1K)
85 #define LOG2_SZ_1M ilog2(SZ_1M)
86 #define LOG2_SZ_1G ilog2(SZ_1G)
87 #define LOG2_SZ_1T ilog2(SZ_1T)
89 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
91 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
92 (((t) - (b)) >> LOG2_SZ_1K));
95 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
97 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
98 (((t) - (b)) >> LOG2_SZ_1M));
101 static inline void print_mlg(char *name, unsigned long b, unsigned long t)
103 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t,
104 (((t) - (b)) >> LOG2_SZ_1G));
108 static inline void print_mlt(char *name, unsigned long b, unsigned long t)
110 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t,
111 (((t) - (b)) >> LOG2_SZ_1T));
114 #define print_mlt(n, b, t) do {} while (0)
117 static inline void print_ml(char *name, unsigned long b, unsigned long t)
119 unsigned long diff = t - b;
121 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10)
122 print_mlt(name, b, t);
123 else if ((diff >> LOG2_SZ_1G) >= 10)
124 print_mlg(name, b, t);
125 else if ((diff >> LOG2_SZ_1M) >= 10)
126 print_mlm(name, b, t);
128 print_mlk(name, b, t);
131 static void __init print_vm_layout(void)
133 pr_notice("Virtual kernel memory layout:\n");
134 print_ml("fixmap", (unsigned long)FIXADDR_START,
135 (unsigned long)FIXADDR_TOP);
136 print_ml("pci io", (unsigned long)PCI_IO_START,
137 (unsigned long)PCI_IO_END);
138 print_ml("vmemmap", (unsigned long)VMEMMAP_START,
139 (unsigned long)VMEMMAP_END);
140 print_ml("vmalloc", (unsigned long)VMALLOC_START,
141 (unsigned long)VMALLOC_END);
143 print_ml("modules", (unsigned long)MODULES_VADDR,
144 (unsigned long)MODULES_END);
146 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
147 (unsigned long)high_memory);
148 if (IS_ENABLED(CONFIG_64BIT)) {
150 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
153 print_ml("kernel", (unsigned long)kernel_map.virt_addr,
154 (unsigned long)ADDRESS_SPACE_END);
158 static void print_vm_layout(void) { }
159 #endif /* CONFIG_DEBUG_VM */
161 void __init mem_init(void)
163 #ifdef CONFIG_FLATMEM
165 #endif /* CONFIG_FLATMEM */
167 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
173 /* Limit the memory size via mem. */
174 static phys_addr_t memory_limit;
175 #ifdef CONFIG_XIP_KERNEL
176 #define memory_limit (*(phys_addr_t *)XIP_FIXUP(&memory_limit))
177 #endif /* CONFIG_XIP_KERNEL */
179 static int __init early_mem(char *p)
186 size = memparse(p, &p) & PAGE_MASK;
187 memory_limit = min_t(u64, size, memory_limit);
189 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
193 early_param("mem", early_mem);
195 static void __init setup_bootmem(void)
197 phys_addr_t vmlinux_end = __pa_symbol(&_end);
198 phys_addr_t max_mapped_addr;
199 phys_addr_t phys_ram_end, vmlinux_start;
201 if (IS_ENABLED(CONFIG_XIP_KERNEL))
202 vmlinux_start = __pa_symbol(&_sdata);
204 vmlinux_start = __pa_symbol(&_start);
206 memblock_enforce_memory_limit(memory_limit);
209 * Make sure we align the reservation on PMD_SIZE since we will
210 * map the kernel in the linear mapping as read-only: we do not want
211 * any allocation to happen between _end and the next pmd aligned page.
213 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
214 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
216 * Reserve from the start of the kernel to the end of the kernel
218 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
220 phys_ram_end = memblock_end_of_DRAM();
223 * Make sure we align the start of the memory on a PMD boundary so that
224 * at worst, we map the linear mapping with PMD mappings.
226 if (!IS_ENABLED(CONFIG_XIP_KERNEL))
227 phys_ram_base = memblock_start_of_DRAM() & PMD_MASK;
230 * In 64-bit, any use of __va/__pa before this point is wrong as we
231 * did not know the start of DRAM before.
233 if (IS_ENABLED(CONFIG_64BIT))
234 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base;
237 * memblock allocator is not aware of the fact that last 4K bytes of
238 * the addressable memory can not be mapped because of IS_ERR_VALUE
239 * macro. Make sure that last 4k bytes are not usable by memblock
240 * if end of dram is equal to maximum addressable memory. For 64-bit
241 * kernel, this problem can't happen here as the end of the virtual
242 * address space is occupied by the kernel mapping then this check must
243 * be done as soon as the kernel mapping base address is determined.
245 if (!IS_ENABLED(CONFIG_64BIT)) {
246 max_mapped_addr = __pa(~(ulong)0);
247 if (max_mapped_addr == (phys_ram_end - 1))
248 memblock_set_current_limit(max_mapped_addr - 4096);
251 min_low_pfn = PFN_UP(phys_ram_base);
252 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
253 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
255 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
256 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
258 reserve_initrd_mem();
261 * No allocation should be done before reserving the memory as defined
262 * in the device tree, otherwise the allocation could end up in a
265 early_init_fdt_scan_reserved_mem();
268 * If DTB is built in, no need to reserve its memblock.
269 * Otherwise, do reserve it but avoid using
270 * early_init_fdt_reserve_self() since __pa() does
271 * not work for DTB pointers that are fixmap addresses
273 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
274 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
276 dma_contiguous_reserve(dma32_phys_limit);
277 if (IS_ENABLED(CONFIG_64BIT))
278 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
282 struct pt_alloc_ops pt_ops __initdata;
284 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
285 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
286 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
288 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
290 #ifdef CONFIG_XIP_KERNEL
291 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
292 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
293 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
294 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
295 #endif /* CONFIG_XIP_KERNEL */
297 static const pgprot_t protection_map[16] = {
298 [VM_NONE] = PAGE_NONE,
299 [VM_READ] = PAGE_READ,
300 [VM_WRITE] = PAGE_COPY,
301 [VM_WRITE | VM_READ] = PAGE_COPY,
302 [VM_EXEC] = PAGE_EXEC,
303 [VM_EXEC | VM_READ] = PAGE_READ_EXEC,
304 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
305 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
306 [VM_SHARED] = PAGE_NONE,
307 [VM_SHARED | VM_READ] = PAGE_READ,
308 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
309 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
310 [VM_SHARED | VM_EXEC] = PAGE_EXEC,
311 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC,
312 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
313 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
315 DECLARE_VM_GET_PAGE_PROT
317 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
319 unsigned long addr = __fix_to_virt(idx);
322 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
324 ptep = &fixmap_pte[pte_index(addr)];
326 if (pgprot_val(prot))
327 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
329 pte_clear(&init_mm, addr, ptep);
330 local_flush_tlb_page(addr);
333 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
335 return (pte_t *)((uintptr_t)pa);
338 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
340 clear_fixmap(FIX_PTE);
341 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
344 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
346 return (pte_t *) __va(pa);
349 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
352 * We only create PMD or PGD early mappings so we
353 * should never reach here with MMU disabled.
358 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
360 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
363 static phys_addr_t __init alloc_pte_late(uintptr_t va)
365 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
367 BUG_ON(!ptdesc || !pagetable_pte_ctor(ptdesc));
368 return __pa((pte_t *)ptdesc_address(ptdesc));
371 static void __init create_pte_mapping(pte_t *ptep,
372 uintptr_t va, phys_addr_t pa,
373 phys_addr_t sz, pgprot_t prot)
375 uintptr_t pte_idx = pte_index(va);
377 BUG_ON(sz != PAGE_SIZE);
379 if (pte_none(ptep[pte_idx]))
380 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
383 #ifndef __PAGETABLE_PMD_FOLDED
385 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
386 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
387 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
389 #ifdef CONFIG_XIP_KERNEL
390 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
391 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
392 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
393 #endif /* CONFIG_XIP_KERNEL */
395 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss;
396 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss;
397 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
399 #ifdef CONFIG_XIP_KERNEL
400 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d))
401 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d))
402 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d))
403 #endif /* CONFIG_XIP_KERNEL */
405 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss;
406 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss;
407 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
409 #ifdef CONFIG_XIP_KERNEL
410 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud))
411 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud))
412 #define early_pud ((pud_t *)XIP_FIXUP(early_pud))
413 #endif /* CONFIG_XIP_KERNEL */
415 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
417 /* Before MMU is enabled */
418 return (pmd_t *)((uintptr_t)pa);
421 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
423 clear_fixmap(FIX_PMD);
424 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
427 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
429 return (pmd_t *) __va(pa);
432 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
434 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT);
436 return (uintptr_t)early_pmd;
439 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
441 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
444 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
446 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);
448 BUG_ON(!ptdesc || !pagetable_pmd_ctor(ptdesc));
449 return __pa((pmd_t *)ptdesc_address(ptdesc));
452 static void __init create_pmd_mapping(pmd_t *pmdp,
453 uintptr_t va, phys_addr_t pa,
454 phys_addr_t sz, pgprot_t prot)
457 phys_addr_t pte_phys;
458 uintptr_t pmd_idx = pmd_index(va);
460 if (sz == PMD_SIZE) {
461 if (pmd_none(pmdp[pmd_idx]))
462 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
466 if (pmd_none(pmdp[pmd_idx])) {
467 pte_phys = pt_ops.alloc_pte(va);
468 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
469 ptep = pt_ops.get_pte_virt(pte_phys);
470 memset(ptep, 0, PAGE_SIZE);
472 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
473 ptep = pt_ops.get_pte_virt(pte_phys);
476 create_pte_mapping(ptep, va, pa, sz, prot);
479 static pud_t *__init get_pud_virt_early(phys_addr_t pa)
481 return (pud_t *)((uintptr_t)pa);
484 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
486 clear_fixmap(FIX_PUD);
487 return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
490 static pud_t *__init get_pud_virt_late(phys_addr_t pa)
492 return (pud_t *)__va(pa);
495 static phys_addr_t __init alloc_pud_early(uintptr_t va)
497 /* Only one PUD is available for early mapping */
498 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
500 return (uintptr_t)early_pud;
503 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
505 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
508 static phys_addr_t alloc_pud_late(uintptr_t va)
512 vaddr = __get_free_page(GFP_KERNEL);
517 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa)
519 return (p4d_t *)((uintptr_t)pa);
522 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
524 clear_fixmap(FIX_P4D);
525 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
528 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa)
530 return (p4d_t *)__va(pa);
533 static phys_addr_t __init alloc_p4d_early(uintptr_t va)
535 /* Only one P4D is available for early mapping */
536 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
538 return (uintptr_t)early_p4d;
541 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
543 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
546 static phys_addr_t alloc_p4d_late(uintptr_t va)
550 vaddr = __get_free_page(GFP_KERNEL);
555 static void __init create_pud_mapping(pud_t *pudp,
556 uintptr_t va, phys_addr_t pa,
557 phys_addr_t sz, pgprot_t prot)
560 phys_addr_t next_phys;
561 uintptr_t pud_index = pud_index(va);
563 if (sz == PUD_SIZE) {
564 if (pud_val(pudp[pud_index]) == 0)
565 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot);
569 if (pud_val(pudp[pud_index]) == 0) {
570 next_phys = pt_ops.alloc_pmd(va);
571 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE);
572 nextp = pt_ops.get_pmd_virt(next_phys);
573 memset(nextp, 0, PAGE_SIZE);
575 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index]));
576 nextp = pt_ops.get_pmd_virt(next_phys);
579 create_pmd_mapping(nextp, va, pa, sz, prot);
582 static void __init create_p4d_mapping(p4d_t *p4dp,
583 uintptr_t va, phys_addr_t pa,
584 phys_addr_t sz, pgprot_t prot)
587 phys_addr_t next_phys;
588 uintptr_t p4d_index = p4d_index(va);
590 if (sz == P4D_SIZE) {
591 if (p4d_val(p4dp[p4d_index]) == 0)
592 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot);
596 if (p4d_val(p4dp[p4d_index]) == 0) {
597 next_phys = pt_ops.alloc_pud(va);
598 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE);
599 nextp = pt_ops.get_pud_virt(next_phys);
600 memset(nextp, 0, PAGE_SIZE);
602 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index]));
603 nextp = pt_ops.get_pud_virt(next_phys);
606 create_pud_mapping(nextp, va, pa, sz, prot);
609 #define pgd_next_t p4d_t
610 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \
611 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \
612 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va)))
613 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \
614 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \
615 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa)))
616 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
617 (pgtable_l5_enabled ? \
618 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \
619 (pgtable_l4_enabled ? \
620 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
621 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
622 #define fixmap_pgd_next (pgtable_l5_enabled ? \
623 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
624 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
625 #define trampoline_pgd_next (pgtable_l5_enabled ? \
626 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
627 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
629 #define pgd_next_t pte_t
630 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
631 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
632 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
633 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
634 #define fixmap_pgd_next ((uintptr_t)fixmap_pte)
635 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
636 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
637 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
638 #endif /* __PAGETABLE_PMD_FOLDED */
640 void __init create_pgd_mapping(pgd_t *pgdp,
641 uintptr_t va, phys_addr_t pa,
642 phys_addr_t sz, pgprot_t prot)
645 phys_addr_t next_phys;
646 uintptr_t pgd_idx = pgd_index(va);
648 if (sz == PGDIR_SIZE) {
649 if (pgd_val(pgdp[pgd_idx]) == 0)
650 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
654 if (pgd_val(pgdp[pgd_idx]) == 0) {
655 next_phys = alloc_pgd_next(va);
656 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
657 nextp = get_pgd_next_virt(next_phys);
658 memset(nextp, 0, PAGE_SIZE);
660 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
661 nextp = get_pgd_next_virt(next_phys);
664 create_pgd_next_mapping(nextp, va, pa, sz, prot);
667 static uintptr_t __init best_map_size(phys_addr_t pa, uintptr_t va,
670 if (!(pa & (PGDIR_SIZE - 1)) && !(va & (PGDIR_SIZE - 1)) && size >= PGDIR_SIZE)
673 if (!(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE)
676 if (!(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE)
679 if (!(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE)
685 #ifdef CONFIG_XIP_KERNEL
686 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
687 extern char _xiprom[], _exiprom[], __data_loc;
689 /* called from head.S with MMU off */
690 asmlinkage void __init __copy_data(void)
692 void *from = (void *)(&__data_loc);
693 void *to = (void *)CONFIG_PHYS_RAM_BASE;
694 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata));
696 memcpy(to, from, sz);
700 #ifdef CONFIG_STRICT_KERNEL_RWX
701 static __init pgprot_t pgprot_from_va(uintptr_t va)
703 if (is_va_kernel_text(va))
704 return PAGE_KERNEL_READ_EXEC;
707 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
708 * we must protect its linear mapping alias from being executed and
710 * And rodata section is marked readonly in mark_rodata_ro.
712 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
713 return PAGE_KERNEL_READ;
718 void mark_rodata_ro(void)
720 set_kernel_memory(__start_rodata, _data, set_memory_ro);
721 if (IS_ENABLED(CONFIG_64BIT))
722 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
728 static __init pgprot_t pgprot_from_va(uintptr_t va)
730 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
733 return PAGE_KERNEL_EXEC;
735 #endif /* CONFIG_STRICT_KERNEL_RWX */
737 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
738 u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa);
740 static void __init disable_pgtable_l5(void)
742 pgtable_l5_enabled = false;
743 kernel_map.page_offset = PAGE_OFFSET_L4;
744 satp_mode = SATP_MODE_48;
747 static void __init disable_pgtable_l4(void)
749 pgtable_l4_enabled = false;
750 kernel_map.page_offset = PAGE_OFFSET_L3;
751 satp_mode = SATP_MODE_39;
754 static int __init print_no4lvl(char *p)
756 pr_info("Disabled 4-level and 5-level paging");
759 early_param("no4lvl", print_no4lvl);
761 static int __init print_no5lvl(char *p)
763 pr_info("Disabled 5-level paging");
766 early_param("no5lvl", print_no5lvl);
769 * There is a simple way to determine if 4-level is supported by the
770 * underlying hardware: establish 1:1 mapping in 4-level page table mode
771 * then read SATP to see if the configuration was taken into account
772 * meaning sv48 is supported.
774 static __init void set_satp_mode(uintptr_t dtb_pa)
776 u64 identity_satp, hw_satp;
777 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
778 u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa);
780 if (satp_mode_cmdline == SATP_MODE_57) {
781 disable_pgtable_l5();
782 } else if (satp_mode_cmdline == SATP_MODE_48) {
783 disable_pgtable_l5();
784 disable_pgtable_l4();
788 create_p4d_mapping(early_p4d,
789 set_satp_mode_pmd, (uintptr_t)early_pud,
790 P4D_SIZE, PAGE_TABLE);
791 create_pud_mapping(early_pud,
792 set_satp_mode_pmd, (uintptr_t)early_pmd,
793 PUD_SIZE, PAGE_TABLE);
794 /* Handle the case where set_satp_mode straddles 2 PMDs */
795 create_pmd_mapping(early_pmd,
796 set_satp_mode_pmd, set_satp_mode_pmd,
797 PMD_SIZE, PAGE_KERNEL_EXEC);
798 create_pmd_mapping(early_pmd,
799 set_satp_mode_pmd + PMD_SIZE,
800 set_satp_mode_pmd + PMD_SIZE,
801 PMD_SIZE, PAGE_KERNEL_EXEC);
803 create_pgd_mapping(early_pg_dir,
806 (uintptr_t)early_p4d : (uintptr_t)early_pud,
807 PGDIR_SIZE, PAGE_TABLE);
809 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
811 local_flush_tlb_all();
812 csr_write(CSR_SATP, identity_satp);
813 hw_satp = csr_swap(CSR_SATP, 0ULL);
814 local_flush_tlb_all();
816 if (hw_satp != identity_satp) {
817 if (pgtable_l5_enabled) {
818 disable_pgtable_l5();
819 memset(early_pg_dir, 0, PAGE_SIZE);
822 disable_pgtable_l4();
825 memset(early_pg_dir, 0, PAGE_SIZE);
826 memset(early_p4d, 0, PAGE_SIZE);
827 memset(early_pud, 0, PAGE_SIZE);
828 memset(early_pmd, 0, PAGE_SIZE);
833 * setup_vm() is called from head.S with MMU-off.
835 * Following requirements should be honoured for setup_vm() to work
837 * 1) It should use PC-relative addressing for accessing kernel symbols.
838 * To achieve this we always use GCC cmodel=medany.
839 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
840 * so disable compiler instrumentation when FTRACE is enabled.
842 * Currently, the above requirements are honoured by using custom CFLAGS
843 * for init.o in mm/Makefile.
846 #ifndef __riscv_cmodel_medany
847 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
850 #ifdef CONFIG_RELOCATABLE
851 extern unsigned long __rela_dyn_start, __rela_dyn_end;
853 static void __init relocate_kernel(void)
855 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start;
857 * This holds the offset between the linked virtual address and the
858 * relocated virtual address.
860 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR;
862 * This holds the offset between kernel linked virtual address and
865 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr;
867 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) {
868 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset);
869 Elf64_Addr relocated_addr = rela->r_addend;
871 if (rela->r_info != R_RISCV_RELATIVE)
875 * Make sure to not relocate vdso symbols like rt_sigreturn
876 * which are linked from the address 0 in vmlinux since
877 * vdso symbol addresses are actually used as an offset from
878 * mm->context.vdso in VDSO_OFFSET macro.
880 if (relocated_addr >= KERNEL_LINK_ADDR)
881 relocated_addr += reloc_offset;
883 *(Elf64_Addr *)addr = relocated_addr;
886 #endif /* CONFIG_RELOCATABLE */
888 #ifdef CONFIG_XIP_KERNEL
889 static void __init create_kernel_page_table(pgd_t *pgdir,
890 __always_unused bool early)
892 uintptr_t va, end_va;
894 /* Map the flash resident part */
895 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
896 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
897 create_pgd_mapping(pgdir, va,
898 kernel_map.xiprom + (va - kernel_map.virt_addr),
899 PMD_SIZE, PAGE_KERNEL_EXEC);
901 /* Map the data in RAM */
902 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
903 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
904 create_pgd_mapping(pgdir, va,
905 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
906 PMD_SIZE, PAGE_KERNEL);
909 static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
911 uintptr_t va, end_va;
913 end_va = kernel_map.virt_addr + kernel_map.size;
914 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
915 create_pgd_mapping(pgdir, va,
916 kernel_map.phys_addr + (va - kernel_map.virt_addr),
919 PAGE_KERNEL_EXEC : pgprot_from_va(va));
924 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
925 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
928 static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va,
931 #ifndef CONFIG_BUILTIN_DTB
932 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
934 /* Make sure the fdt fixmap address is always aligned on PMD size */
935 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE));
937 /* In 32-bit only, the fdt lies in its own PGD */
938 if (!IS_ENABLED(CONFIG_64BIT)) {
939 create_pgd_mapping(early_pg_dir, fix_fdt_va,
940 pa, MAX_FDT_SIZE, PAGE_KERNEL);
942 create_pmd_mapping(fixmap_pmd, fix_fdt_va,
943 pa, PMD_SIZE, PAGE_KERNEL);
944 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE,
945 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
948 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1));
951 * For 64-bit kernel, __va can't be used since it would return a linear
952 * mapping address whereas dtb_early_va will be used before
953 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
954 * kernel is mapped in the linear mapping, that makes no difference.
956 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa);
959 dtb_early_pa = dtb_pa;
963 * MMU is not enabled, the page tables are allocated directly using
964 * early_pmd/pud/p4d and the address returned is the physical one.
966 static void __init pt_ops_set_early(void)
968 pt_ops.alloc_pte = alloc_pte_early;
969 pt_ops.get_pte_virt = get_pte_virt_early;
970 #ifndef __PAGETABLE_PMD_FOLDED
971 pt_ops.alloc_pmd = alloc_pmd_early;
972 pt_ops.get_pmd_virt = get_pmd_virt_early;
973 pt_ops.alloc_pud = alloc_pud_early;
974 pt_ops.get_pud_virt = get_pud_virt_early;
975 pt_ops.alloc_p4d = alloc_p4d_early;
976 pt_ops.get_p4d_virt = get_p4d_virt_early;
981 * MMU is enabled but page table setup is not complete yet.
982 * fixmap page table alloc functions must be used as a means to temporarily
983 * map the allocated physical pages since the linear mapping does not exist yet.
985 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va,
986 * but it will be used as described above.
988 static void __init pt_ops_set_fixmap(void)
990 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap);
991 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap);
992 #ifndef __PAGETABLE_PMD_FOLDED
993 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap);
994 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap);
995 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap);
996 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap);
997 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap);
998 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap);
1003 * MMU is enabled and page table setup is complete, so from now, we can use
1004 * generic page allocation functions to setup page table.
1006 static void __init pt_ops_set_late(void)
1008 pt_ops.alloc_pte = alloc_pte_late;
1009 pt_ops.get_pte_virt = get_pte_virt_late;
1010 #ifndef __PAGETABLE_PMD_FOLDED
1011 pt_ops.alloc_pmd = alloc_pmd_late;
1012 pt_ops.get_pmd_virt = get_pmd_virt_late;
1013 pt_ops.alloc_pud = alloc_pud_late;
1014 pt_ops.get_pud_virt = get_pud_virt_late;
1015 pt_ops.alloc_p4d = alloc_p4d_late;
1016 pt_ops.get_p4d_virt = get_p4d_virt_late;
1020 #ifdef CONFIG_RANDOMIZE_BASE
1021 extern bool __init __pi_set_nokaslr_from_cmdline(uintptr_t dtb_pa);
1022 extern u64 __init __pi_get_kaslr_seed(uintptr_t dtb_pa);
1024 static int __init print_nokaslr(char *p)
1026 pr_info("Disabled KASLR");
1029 early_param("nokaslr", print_nokaslr);
1031 unsigned long kaslr_offset(void)
1033 return kernel_map.virt_offset;
1037 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1039 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
1041 #ifdef CONFIG_RANDOMIZE_BASE
1042 if (!__pi_set_nokaslr_from_cmdline(dtb_pa)) {
1043 u64 kaslr_seed = __pi_get_kaslr_seed(dtb_pa);
1044 u32 kernel_size = (uintptr_t)(&_end) - (uintptr_t)(&_start);
1048 * Compute the number of positions available: we are limited
1049 * by the early page table that only has one PUD and we must
1050 * be aligned on PMD_SIZE.
1052 nr_pos = (PUD_SIZE - kernel_size) / PMD_SIZE;
1054 kernel_map.virt_offset = (kaslr_seed % nr_pos) * PMD_SIZE;
1058 kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset;
1060 #ifdef CONFIG_XIP_KERNEL
1062 kernel_map.page_offset = PAGE_OFFSET_L3;
1064 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
1066 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
1067 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
1069 phys_ram_base = CONFIG_PHYS_RAM_BASE;
1070 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
1071 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
1073 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
1075 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
1076 kernel_map.phys_addr = (uintptr_t)(&_start);
1077 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
1080 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
1081 set_satp_mode(dtb_pa);
1085 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem,
1086 * where we have the system memory layout: this allows us to align
1087 * the physical and virtual mappings and then make use of PUD/P4D/PGD
1088 * for the linear mapping. This is only possible because the kernel
1089 * mapping lies outside the linear mapping.
1090 * In 32-bit however, as the kernel resides in the linear mapping,
1091 * setup_vm_final can not change the mapping established here,
1092 * otherwise the same kernel addresses would get mapped to different
1093 * physical addresses (if the start of dram is different from the
1094 * kernel physical address start).
1096 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ?
1097 0UL : PAGE_OFFSET - kernel_map.phys_addr;
1098 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
1101 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
1102 * kernel, whereas for 64-bit kernel, the end of the virtual address
1103 * space is occupied by the modules/BPF/kernel mappings which reduces
1104 * the available size of the linear mapping.
1106 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
1108 /* Sanity check alignment and size */
1109 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
1110 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
1114 * The last 4K bytes of the addressable memory can not be mapped because
1115 * of IS_ERR_VALUE macro.
1117 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
1120 #ifdef CONFIG_RELOCATABLE
1122 * Early page table uses only one PUD, which makes it possible
1123 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset
1124 * makes the kernel cross over a PUD_SIZE boundary, raise a bug
1125 * since a part of the kernel would not get mapped.
1127 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size);
1131 apply_early_boot_alternatives();
1134 /* Setup early PGD for fixmap */
1135 create_pgd_mapping(early_pg_dir, FIXADDR_START,
1136 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1138 #ifndef __PAGETABLE_PMD_FOLDED
1139 /* Setup fixmap P4D and PUD */
1140 if (pgtable_l5_enabled)
1141 create_p4d_mapping(fixmap_p4d, FIXADDR_START,
1142 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE);
1143 /* Setup fixmap PUD and PMD */
1144 if (pgtable_l4_enabled)
1145 create_pud_mapping(fixmap_pud, FIXADDR_START,
1146 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
1147 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
1148 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
1149 /* Setup trampoline PGD and PMD */
1150 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1151 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1152 if (pgtable_l5_enabled)
1153 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr,
1154 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE);
1155 if (pgtable_l4_enabled)
1156 create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
1157 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
1158 #ifdef CONFIG_XIP_KERNEL
1159 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1160 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
1162 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1163 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
1166 /* Setup trampoline PGD */
1167 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1168 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
1172 * Setup early PGD covering entire kernel which will allow
1173 * us to reach paging_init(). We map all memory banks later
1174 * in setup_vm_final() below.
1176 create_kernel_page_table(early_pg_dir, true);
1178 /* Setup early mapping for FDT early scan */
1179 create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa);
1182 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1183 * range can not span multiple pmds.
1185 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1186 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1188 #ifndef __PAGETABLE_PMD_FOLDED
1190 * Early ioremap fixmap is already created as it lies within first 2MB
1191 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
1192 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
1195 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
1196 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
1197 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
1199 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
1200 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
1201 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
1202 fix_to_virt(FIX_BTMAP_BEGIN));
1203 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
1204 fix_to_virt(FIX_BTMAP_END));
1206 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1207 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1211 pt_ops_set_fixmap();
1214 static void __init create_linear_mapping_range(phys_addr_t start,
1216 uintptr_t fixed_map_size)
1219 uintptr_t va, map_size;
1221 for (pa = start; pa < end; pa += map_size) {
1222 va = (uintptr_t)__va(pa);
1223 map_size = fixed_map_size ? fixed_map_size :
1224 best_map_size(pa, va, end - pa);
1226 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1227 pgprot_from_va(va));
1231 static void __init create_linear_mapping_page_table(void)
1233 phys_addr_t start, end;
1234 phys_addr_t kfence_pool __maybe_unused;
1237 #ifdef CONFIG_STRICT_KERNEL_RWX
1238 phys_addr_t ktext_start = __pa_symbol(_start);
1239 phys_addr_t ktext_size = __init_data_begin - _start;
1240 phys_addr_t krodata_start = __pa_symbol(__start_rodata);
1241 phys_addr_t krodata_size = _data - __start_rodata;
1243 /* Isolate kernel text and rodata so they don't get mapped with a PUD */
1244 memblock_mark_nomap(ktext_start, ktext_size);
1245 memblock_mark_nomap(krodata_start, krodata_size);
1248 #ifdef CONFIG_KFENCE
1250 * kfence pool must be backed by PAGE_SIZE mappings, so allocate it
1251 * before we setup the linear mapping so that we avoid using hugepages
1254 kfence_pool = memblock_phys_alloc(KFENCE_POOL_SIZE, PAGE_SIZE);
1255 BUG_ON(!kfence_pool);
1257 memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE);
1258 __kfence_pool = __va(kfence_pool);
1261 /* Map all memory banks in the linear mapping */
1262 for_each_mem_range(i, &start, &end) {
1265 if (start <= __pa(PAGE_OFFSET) &&
1266 __pa(PAGE_OFFSET) < end)
1267 start = __pa(PAGE_OFFSET);
1268 if (end >= __pa(PAGE_OFFSET) + memory_limit)
1269 end = __pa(PAGE_OFFSET) + memory_limit;
1271 create_linear_mapping_range(start, end, 0);
1274 #ifdef CONFIG_STRICT_KERNEL_RWX
1275 create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0);
1276 create_linear_mapping_range(krodata_start,
1277 krodata_start + krodata_size, 0);
1279 memblock_clear_nomap(ktext_start, ktext_size);
1280 memblock_clear_nomap(krodata_start, krodata_size);
1283 #ifdef CONFIG_KFENCE
1284 create_linear_mapping_range(kfence_pool,
1285 kfence_pool + KFENCE_POOL_SIZE,
1288 memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
1292 static void __init setup_vm_final(void)
1294 /* Setup swapper PGD for fixmap */
1295 #if !defined(CONFIG_64BIT)
1297 * In 32-bit, the device tree lies in a pgd entry, so it must be copied
1298 * directly in swapper_pg_dir in addition to the pgd entry that points
1301 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT));
1303 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]);
1305 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1306 __pa_symbol(fixmap_pgd_next),
1307 PGDIR_SIZE, PAGE_TABLE);
1309 /* Map the linear mapping */
1310 create_linear_mapping_page_table();
1312 /* Map the kernel */
1313 if (IS_ENABLED(CONFIG_64BIT))
1314 create_kernel_page_table(swapper_pg_dir, false);
1317 kasan_swapper_init();
1320 /* Clear fixmap PTE and PMD mappings */
1321 clear_fixmap(FIX_PTE);
1322 clear_fixmap(FIX_PMD);
1323 clear_fixmap(FIX_PUD);
1324 clear_fixmap(FIX_P4D);
1326 /* Move to swapper page table */
1327 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode);
1328 local_flush_tlb_all();
1333 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1335 dtb_early_va = (void *)dtb_pa;
1336 dtb_early_pa = dtb_pa;
1339 static inline void setup_vm_final(void)
1342 #endif /* CONFIG_MMU */
1344 /* Reserve 128M low memory by default for swiotlb buffer */
1345 #define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
1347 static int __init reserve_crashkernel_low(unsigned long long low_size)
1349 unsigned long long low_base;
1351 low_base = memblock_phys_alloc_range(low_size, PMD_SIZE, 0, dma32_phys_limit);
1353 pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
1357 pr_info("crashkernel low memory reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
1358 low_base, low_base + low_size, low_size >> 20);
1360 crashk_low_res.start = low_base;
1361 crashk_low_res.end = low_base + low_size - 1;
1367 * reserve_crashkernel() - reserves memory for crash kernel
1369 * This function reserves memory area given in "crashkernel=" kernel command
1370 * line parameter. The memory reserved is used by dump capture kernel when
1371 * primary kernel is crashing.
1373 static void __init reserve_crashkernel(void)
1375 unsigned long long crash_base = 0;
1376 unsigned long long crash_size = 0;
1377 unsigned long long crash_low_size = 0;
1378 unsigned long search_start = memblock_start_of_DRAM();
1379 unsigned long search_end = (unsigned long)dma32_phys_limit;
1380 char *cmdline = boot_command_line;
1381 bool fixed_base = false;
1386 if (!IS_ENABLED(CONFIG_KEXEC_CORE))
1389 * Don't reserve a region for a crash kernel on a crash kernel
1390 * since it doesn't make much sense and we have limited memory
1393 if (is_kdump_kernel()) {
1394 pr_info("crashkernel: ignoring reservation request\n");
1398 ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
1399 &crash_size, &crash_base);
1400 if (ret == -ENOENT) {
1401 /* Fallback to crashkernel=X,[high,low] */
1402 ret = parse_crashkernel_high(cmdline, 0, &crash_size, &crash_base);
1403 if (ret || !crash_size)
1407 * crashkernel=Y,low is valid only when crashkernel=X,high
1410 ret = parse_crashkernel_low(cmdline, 0, &crash_low_size, &crash_base);
1412 crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
1416 search_start = (unsigned long)dma32_phys_limit;
1417 search_end = memblock_end_of_DRAM();
1419 } else if (ret || !crash_size) {
1420 /* Invalid argument value specified */
1424 crash_size = PAGE_ALIGN(crash_size);
1428 search_start = crash_base;
1429 search_end = crash_base + crash_size;
1433 * Current riscv boot protocol requires 2MB alignment for
1434 * RV64 and 4MB alignment for RV32 (hugepage size)
1436 * Try to alloc from 32bit addressible physical memory so that
1437 * swiotlb can work on the crash kernel.
1439 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1440 search_start, search_end);
1441 if (crash_base == 0) {
1443 * For crashkernel=size[KMG]@offset[KMG], print out failure
1444 * message if can't reserve the specified region.
1447 pr_warn("crashkernel: allocating failed with given size@offset\n");
1453 * For crashkernel=size[KMG],high, if the first attempt was
1454 * for high memory, fall back to low memory.
1456 search_start = memblock_start_of_DRAM();
1457 search_end = (unsigned long)dma32_phys_limit;
1460 * For crashkernel=size[KMG], if the first attempt was for
1461 * low memory, fall back to high memory, the minimum required
1462 * low memory will be reserved later.
1464 search_start = (unsigned long)dma32_phys_limit;
1465 search_end = memblock_end_of_DRAM();
1466 crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
1469 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1470 search_start, search_end);
1471 if (crash_base == 0) {
1472 pr_warn("crashkernel: couldn't allocate %lldKB\n",
1478 if ((crash_base >= dma32_phys_limit) && crash_low_size &&
1479 reserve_crashkernel_low(crash_low_size)) {
1480 memblock_phys_free(crash_base, crash_size);
1484 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
1485 crash_base, crash_base + crash_size, crash_size >> 20);
1487 crashk_res.start = crash_base;
1488 crashk_res.end = crash_base + crash_size - 1;
1491 void __init paging_init(void)
1496 /* Depend on that Linear Mapping is ready */
1497 memblock_allow_resize();
1500 void __init misc_mem_init(void)
1502 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1506 reserve_crashkernel();
1507 memblock_dump_all();
1510 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1511 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1512 struct vmem_altmap *altmap)
1514 return vmemmap_populate_basepages(start, end, node, NULL);
1518 #if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
1520 * Pre-allocates page-table pages for a specific area in the kernel
1521 * page-table. Only the level which needs to be synchronized between
1522 * all page-tables is allocated because the synchronization can be
1525 static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end,
1531 for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
1532 pgd_t *pgd = pgd_offset_k(addr);
1538 p4d = p4d_alloc(&init_mm, pgd, addr);
1542 if (pgtable_l5_enabled)
1546 pud = pud_alloc(&init_mm, p4d, addr);
1550 if (pgtable_l4_enabled)
1554 pmd = pmd_alloc(&init_mm, pud, addr);
1562 * The pages have to be there now or they will be missing in
1563 * process page-tables later.
1565 panic("Failed to pre-allocate %s pages for %s area\n", lvl, area);
1568 void __init pgtable_cache_init(void)
1570 preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc");
1571 if (IS_ENABLED(CONFIG_MODULES))
1572 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");