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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2012 Regents of the University of California
- * Copyright (C) 2019 Western Digital Corporation or its affiliates.
- * Copyright (C) 2020 FORTH-ICS/CARV
- * Nick Kossifidis <mick@ics.forth.gr>
- */
- #include <linux/init.h>
- #include <linux/mm.h>
- #include <linux/memblock.h>
- #include <linux/initrd.h>
- #include <linux/swap.h>
- #include <linux/sizes.h>
- #include <linux/of_fdt.h>
- #include <linux/of_reserved_mem.h>
- #include <linux/libfdt.h>
- #include <linux/set_memory.h>
- #include <linux/crash_dump.h>
- #include <asm/fixmap.h>
- #include <asm/tlbflush.h>
- #include <asm/sections.h>
- #include <asm/soc.h>
- #include <asm/io.h>
- #include <asm/ptdump.h>
- #include "../kernel/head.h"
- unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
- __page_aligned_bss;
- EXPORT_SYMBOL(empty_zero_page);
- extern char _start[];
- #define DTB_EARLY_BASE_VA PGDIR_SIZE
- void *dtb_early_va __initdata;
- uintptr_t dtb_early_pa __initdata;
- struct pt_alloc_ops {
- pte_t *(*get_pte_virt)(phys_addr_t pa);
- phys_addr_t (*alloc_pte)(uintptr_t va);
- #ifndef __PAGETABLE_PMD_FOLDED
- pmd_t *(*get_pmd_virt)(phys_addr_t pa);
- phys_addr_t (*alloc_pmd)(uintptr_t va);
- #endif
- };
- static void __init zone_sizes_init(void)
- {
- unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
- #ifdef CONFIG_ZONE_DMA32
- max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
- (unsigned long) PFN_PHYS(max_low_pfn)));
- #endif
- max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
- free_area_init(max_zone_pfns);
- }
- static void setup_zero_page(void)
- {
- memset((void *)empty_zero_page, 0, PAGE_SIZE);
- }
- #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
- static inline void print_mlk(char *name, unsigned long b, unsigned long t)
- {
- pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
- (((t) - (b)) >> 10));
- }
- static inline void print_mlm(char *name, unsigned long b, unsigned long t)
- {
- pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
- (((t) - (b)) >> 20));
- }
- static void print_vm_layout(void)
- {
- pr_notice("Virtual kernel memory layout:\n");
- print_mlk("fixmap", (unsigned long)FIXADDR_START,
- (unsigned long)FIXADDR_TOP);
- print_mlm("pci io", (unsigned long)PCI_IO_START,
- (unsigned long)PCI_IO_END);
- print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
- (unsigned long)VMEMMAP_END);
- print_mlm("vmalloc", (unsigned long)VMALLOC_START,
- (unsigned long)VMALLOC_END);
- print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
- (unsigned long)high_memory);
- }
- #else
- static void print_vm_layout(void) { }
- #endif /* CONFIG_DEBUG_VM */
- void __init mem_init(void)
- {
- #ifdef CONFIG_FLATMEM
- BUG_ON(!mem_map);
- #endif /* CONFIG_FLATMEM */
- high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
- memblock_free_all();
- mem_init_print_info(NULL);
- print_vm_layout();
- }
- #ifdef CONFIG_BLK_DEV_INITRD
- static void __init setup_initrd(void)
- {
- phys_addr_t start;
- unsigned long size;
- /* Ignore the virtul address computed during device tree parsing */
- initrd_start = initrd_end = 0;
- if (!phys_initrd_size)
- return;
- /*
- * Round the memory region to page boundaries as per free_initrd_mem()
- * This allows us to detect whether the pages overlapping the initrd
- * are in use, but more importantly, reserves the entire set of pages
- * as we don't want these pages allocated for other purposes.
- */
- start = round_down(phys_initrd_start, PAGE_SIZE);
- size = phys_initrd_size + (phys_initrd_start - start);
- size = round_up(size, PAGE_SIZE);
- if (!memblock_is_region_memory(start, size)) {
- pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
- (u64)start, size);
- goto disable;
- }
- if (memblock_is_region_reserved(start, size)) {
- pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
- (u64)start, size);
- goto disable;
- }
- memblock_reserve(start, size);
- /* Now convert initrd to virtual addresses */
- initrd_start = (unsigned long)__va(phys_initrd_start);
- initrd_end = initrd_start + phys_initrd_size;
- initrd_below_start_ok = 1;
- pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
- (void *)(initrd_start), size);
- return;
- disable:
- pr_cont(" - disabling initrd\n");
- initrd_start = 0;
- initrd_end = 0;
- }
- #endif /* CONFIG_BLK_DEV_INITRD */
- void __init setup_bootmem(void)
- {
- phys_addr_t mem_start = 0;
- phys_addr_t start, dram_end, end = 0;
- phys_addr_t vmlinux_end = __pa_symbol(&_end);
- phys_addr_t vmlinux_start = __pa_symbol(&_start);
- phys_addr_t max_mapped_addr = __pa(~(ulong)0);
- u64 i;
- /* Find the memory region containing the kernel */
- for_each_mem_range(i, &start, &end) {
- phys_addr_t size = end - start;
- if (!mem_start)
- mem_start = start;
- if (start <= vmlinux_start && vmlinux_end <= end)
- BUG_ON(size == 0);
- }
- /*
- * The maximal physical memory size is -PAGE_OFFSET.
- * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
- * as it is unusable by kernel.
- */
- memblock_enforce_memory_limit(-PAGE_OFFSET);
- /* Reserve from the start of the kernel to the end of the kernel */
- memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
- dram_end = memblock_end_of_DRAM();
- /*
- * memblock allocator is not aware of the fact that last 4K bytes of
- * the addressable memory can not be mapped because of IS_ERR_VALUE
- * macro. Make sure that last 4k bytes are not usable by memblock
- * if end of dram is equal to maximum addressable memory.
- */
- if (max_mapped_addr == (dram_end - 1))
- memblock_set_current_limit(max_mapped_addr - 4096);
- max_pfn = PFN_DOWN(dram_end);
- max_low_pfn = max_pfn;
- set_max_mapnr(max_low_pfn);
- #ifdef CONFIG_BLK_DEV_INITRD
- setup_initrd();
- #endif /* CONFIG_BLK_DEV_INITRD */
- /*
- * Avoid using early_init_fdt_reserve_self() since __pa() does
- * not work for DTB pointers that are fixmap addresses
- */
- memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
- early_init_fdt_scan_reserved_mem();
- memblock_allow_resize();
- memblock_dump_all();
- }
- #ifdef CONFIG_MMU
- static struct pt_alloc_ops pt_ops;
- unsigned long va_pa_offset;
- EXPORT_SYMBOL(va_pa_offset);
- unsigned long pfn_base;
- EXPORT_SYMBOL(pfn_base);
- pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
- pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
- pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
- pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
- void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
- {
- unsigned long addr = __fix_to_virt(idx);
- pte_t *ptep;
- BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
- ptep = &fixmap_pte[pte_index(addr)];
- if (pgprot_val(prot))
- set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
- else
- pte_clear(&init_mm, addr, ptep);
- local_flush_tlb_page(addr);
- }
- static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
- {
- return (pte_t *)((uintptr_t)pa);
- }
- static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
- {
- clear_fixmap(FIX_PTE);
- return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
- }
- static inline pte_t *get_pte_virt_late(phys_addr_t pa)
- {
- return (pte_t *) __va(pa);
- }
- static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
- {
- /*
- * We only create PMD or PGD early mappings so we
- * should never reach here with MMU disabled.
- */
- BUG();
- }
- static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
- {
- return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
- }
- static phys_addr_t alloc_pte_late(uintptr_t va)
- {
- unsigned long vaddr;
- vaddr = __get_free_page(GFP_KERNEL);
- if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
- BUG();
- return __pa(vaddr);
- }
- static void __init create_pte_mapping(pte_t *ptep,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
- {
- uintptr_t pte_idx = pte_index(va);
- BUG_ON(sz != PAGE_SIZE);
- if (pte_none(ptep[pte_idx]))
- ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
- }
- #ifndef __PAGETABLE_PMD_FOLDED
- pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
- pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
- pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
- pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
- static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
- {
- /* Before MMU is enabled */
- return (pmd_t *)((uintptr_t)pa);
- }
- static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
- {
- clear_fixmap(FIX_PMD);
- return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
- }
- static pmd_t *get_pmd_virt_late(phys_addr_t pa)
- {
- return (pmd_t *) __va(pa);
- }
- static phys_addr_t __init alloc_pmd_early(uintptr_t va)
- {
- BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
- return (uintptr_t)early_pmd;
- }
- static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
- {
- return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
- }
- static phys_addr_t alloc_pmd_late(uintptr_t va)
- {
- unsigned long vaddr;
- vaddr = __get_free_page(GFP_KERNEL);
- BUG_ON(!vaddr);
- return __pa(vaddr);
- }
- static void __init create_pmd_mapping(pmd_t *pmdp,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
- {
- pte_t *ptep;
- phys_addr_t pte_phys;
- uintptr_t pmd_idx = pmd_index(va);
- if (sz == PMD_SIZE) {
- if (pmd_none(pmdp[pmd_idx]))
- pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
- return;
- }
- if (pmd_none(pmdp[pmd_idx])) {
- pte_phys = pt_ops.alloc_pte(va);
- pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
- ptep = pt_ops.get_pte_virt(pte_phys);
- memset(ptep, 0, PAGE_SIZE);
- } else {
- pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
- ptep = pt_ops.get_pte_virt(pte_phys);
- }
- create_pte_mapping(ptep, va, pa, sz, prot);
- }
- #define pgd_next_t pmd_t
- #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
- #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
- #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
- create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
- #define fixmap_pgd_next fixmap_pmd
- #else
- #define pgd_next_t pte_t
- #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
- #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
- #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
- create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
- #define fixmap_pgd_next fixmap_pte
- #endif
- void __init create_pgd_mapping(pgd_t *pgdp,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
- {
- pgd_next_t *nextp;
- phys_addr_t next_phys;
- uintptr_t pgd_idx = pgd_index(va);
- if (sz == PGDIR_SIZE) {
- if (pgd_val(pgdp[pgd_idx]) == 0)
- pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
- return;
- }
- if (pgd_val(pgdp[pgd_idx]) == 0) {
- next_phys = alloc_pgd_next(va);
- pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
- nextp = get_pgd_next_virt(next_phys);
- memset(nextp, 0, PAGE_SIZE);
- } else {
- next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
- nextp = get_pgd_next_virt(next_phys);
- }
- create_pgd_next_mapping(nextp, va, pa, sz, prot);
- }
- static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
- {
- /* Upgrade to PMD_SIZE mappings whenever possible */
- if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
- return PAGE_SIZE;
- return PMD_SIZE;
- }
- /*
- * setup_vm() is called from head.S with MMU-off.
- *
- * Following requirements should be honoured for setup_vm() to work
- * correctly:
- * 1) It should use PC-relative addressing for accessing kernel symbols.
- * To achieve this we always use GCC cmodel=medany.
- * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
- * so disable compiler instrumentation when FTRACE is enabled.
- *
- * Currently, the above requirements are honoured by using custom CFLAGS
- * for init.o in mm/Makefile.
- */
- #ifndef __riscv_cmodel_medany
- #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
- #endif
- asmlinkage void __init setup_vm(uintptr_t dtb_pa)
- {
- uintptr_t va, pa, end_va;
- uintptr_t load_pa = (uintptr_t)(&_start);
- uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
- uintptr_t map_size;
- #ifndef __PAGETABLE_PMD_FOLDED
- pmd_t fix_bmap_spmd, fix_bmap_epmd;
- #endif
- va_pa_offset = PAGE_OFFSET - load_pa;
- pfn_base = PFN_DOWN(load_pa);
- /*
- * Enforce boot alignment requirements of RV32 and
- * RV64 by only allowing PMD or PGD mappings.
- */
- map_size = PMD_SIZE;
- /* Sanity check alignment and size */
- BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
- BUG_ON((load_pa % map_size) != 0);
- pt_ops.alloc_pte = alloc_pte_early;
- pt_ops.get_pte_virt = get_pte_virt_early;
- #ifndef __PAGETABLE_PMD_FOLDED
- pt_ops.alloc_pmd = alloc_pmd_early;
- pt_ops.get_pmd_virt = get_pmd_virt_early;
- #endif
- /* Setup early PGD for fixmap */
- create_pgd_mapping(early_pg_dir, FIXADDR_START,
- (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
- #ifndef __PAGETABLE_PMD_FOLDED
- /* Setup fixmap PMD */
- create_pmd_mapping(fixmap_pmd, FIXADDR_START,
- (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
- /* Setup trampoline PGD and PMD */
- create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
- (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
- create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
- load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
- #else
- /* Setup trampoline PGD */
- create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
- load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
- #endif
- /*
- * Setup early PGD covering entire kernel which will allows
- * us to reach paging_init(). We map all memory banks later
- * in setup_vm_final() below.
- */
- end_va = PAGE_OFFSET + load_sz;
- for (va = PAGE_OFFSET; va < end_va; va += map_size)
- create_pgd_mapping(early_pg_dir, va,
- load_pa + (va - PAGE_OFFSET),
- map_size, PAGE_KERNEL_EXEC);
- #ifndef __PAGETABLE_PMD_FOLDED
- /* Setup early PMD for DTB */
- create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
- (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
- /* Create two consecutive PMD mappings for FDT early scan */
- pa = dtb_pa & ~(PMD_SIZE - 1);
- create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
- pa, PMD_SIZE, PAGE_KERNEL);
- create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
- pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
- dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
- #else
- /* Create two consecutive PGD mappings for FDT early scan */
- pa = dtb_pa & ~(PGDIR_SIZE - 1);
- create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
- pa, PGDIR_SIZE, PAGE_KERNEL);
- create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
- pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
- dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
- #endif
- dtb_early_pa = dtb_pa;
- /*
- * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
- * range can not span multiple pmds.
- */
- BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
- != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
- #ifndef __PAGETABLE_PMD_FOLDED
- /*
- * Early ioremap fixmap is already created as it lies within first 2MB
- * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
- * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
- * the user if not.
- */
- fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
- fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
- if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
- WARN_ON(1);
- pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
- pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
- pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
- fix_to_virt(FIX_BTMAP_BEGIN));
- pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
- fix_to_virt(FIX_BTMAP_END));
- pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
- pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
- }
- #endif
- }
- static void __init setup_vm_final(void)
- {
- uintptr_t va, map_size;
- phys_addr_t pa, start, end;
- u64 i;
- /**
- * MMU is enabled at this point. But page table setup is not complete yet.
- * fixmap page table alloc functions should be used at this point
- */
- pt_ops.alloc_pte = alloc_pte_fixmap;
- pt_ops.get_pte_virt = get_pte_virt_fixmap;
- #ifndef __PAGETABLE_PMD_FOLDED
- pt_ops.alloc_pmd = alloc_pmd_fixmap;
- pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
- #endif
- /* Setup swapper PGD for fixmap */
- create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
- __pa_symbol(fixmap_pgd_next),
- PGDIR_SIZE, PAGE_TABLE);
- /* Map all memory banks */
- for_each_mem_range(i, &start, &end) {
- if (start >= end)
- break;
- if (start <= __pa(PAGE_OFFSET) &&
- __pa(PAGE_OFFSET) < end)
- start = __pa(PAGE_OFFSET);
- map_size = best_map_size(start, end - start);
- for (pa = start; pa < end; pa += map_size) {
- va = (uintptr_t)__va(pa);
- create_pgd_mapping(swapper_pg_dir, va, pa,
- map_size, PAGE_KERNEL_EXEC);
- }
- }
- /* Clear fixmap PTE and PMD mappings */
- clear_fixmap(FIX_PTE);
- clear_fixmap(FIX_PMD);
- /* Move to swapper page table */
- csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
- local_flush_tlb_all();
- /* generic page allocation functions must be used to setup page table */
- pt_ops.alloc_pte = alloc_pte_late;
- pt_ops.get_pte_virt = get_pte_virt_late;
- #ifndef __PAGETABLE_PMD_FOLDED
- pt_ops.alloc_pmd = alloc_pmd_late;
- pt_ops.get_pmd_virt = get_pmd_virt_late;
- #endif
- }
- #else
- asmlinkage void __init setup_vm(uintptr_t dtb_pa)
- {
- #ifdef CONFIG_BUILTIN_DTB
- dtb_early_va = soc_lookup_builtin_dtb();
- if (!dtb_early_va) {
- /* Fallback to first available DTS */
- dtb_early_va = (void *) __dtb_start;
- }
- #else
- dtb_early_va = (void *)dtb_pa;
- #endif
- dtb_early_pa = dtb_pa;
- }
- static inline void setup_vm_final(void)
- {
- }
- #endif /* CONFIG_MMU */
- #ifdef CONFIG_STRICT_KERNEL_RWX
- void mark_rodata_ro(void)
- {
- unsigned long text_start = (unsigned long)_text;
- unsigned long text_end = (unsigned long)_etext;
- unsigned long rodata_start = (unsigned long)__start_rodata;
- unsigned long data_start = (unsigned long)_data;
- unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
- set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT);
- set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
- set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
- set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
- debug_checkwx();
- }
- #endif
- #ifdef CONFIG_KEXEC_CORE
- /*
- * reserve_crashkernel() - reserves memory for crash kernel
- *
- * This function reserves memory area given in "crashkernel=" kernel command
- * line parameter. The memory reserved is used by dump capture kernel when
- * primary kernel is crashing.
- */
- static void __init reserve_crashkernel(void)
- {
- unsigned long long crash_base = 0;
- unsigned long long crash_size = 0;
- unsigned long search_start = memblock_start_of_DRAM();
- unsigned long search_end = memblock_end_of_DRAM();
- int ret = 0;
- /*
- * Don't reserve a region for a crash kernel on a crash kernel
- * since it doesn't make much sense and we have limited memory
- * resources.
- */
- #ifdef CONFIG_CRASH_DUMP
- if (is_kdump_kernel()) {
- pr_info("crashkernel: ignoring reservation request\n");
- return;
- }
- #endif
- ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
- &crash_size, &crash_base);
- if (ret || !crash_size)
- return;
- crash_size = PAGE_ALIGN(crash_size);
- if (crash_base == 0) {
- /*
- * Current riscv boot protocol requires 2MB alignment for
- * RV64 and 4MB alignment for RV32 (hugepage size)
- */
- crash_base = memblock_find_in_range(search_start, search_end,
- crash_size, PMD_SIZE);
- if (crash_base == 0) {
- pr_warn("crashkernel: couldn't allocate %lldKB\n",
- crash_size >> 10);
- return;
- }
- } else {
- /* User specifies base address explicitly. */
- if (!memblock_is_region_memory(crash_base, crash_size)) {
- pr_warn("crashkernel: requested region is not memory\n");
- return;
- }
- if (memblock_is_region_reserved(crash_base, crash_size)) {
- pr_warn("crashkernel: requested region is reserved\n");
- return;
- }
- if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
- pr_warn("crashkernel: requested region is misaligned\n");
- return;
- }
- }
- memblock_reserve(crash_base, crash_size);
- pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
- crash_base, crash_base + crash_size, crash_size >> 20);
- crashk_res.start = crash_base;
- crashk_res.end = crash_base + crash_size - 1;
- }
- #endif /* CONFIG_KEXEC_CORE */
- #ifdef CONFIG_CRASH_DUMP
- /*
- * We keep track of the ELF core header of the crashed
- * kernel with a reserved-memory region with compatible
- * string "linux,elfcorehdr". Here we register a callback
- * to populate elfcorehdr_addr/size when this region is
- * present. Note that this region will be marked as
- * reserved once we call early_init_fdt_scan_reserved_mem()
- * later on.
- */
- static int elfcore_hdr_setup(struct reserved_mem *rmem)
- {
- elfcorehdr_addr = rmem->base;
- elfcorehdr_size = rmem->size;
- return 0;
- }
- RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
- #endif
- void __init paging_init(void)
- {
- setup_vm_final();
- sparse_init();
- setup_zero_page();
- zone_sizes_init();
- #ifdef CONFIG_KEXEC_CORE
- reserve_crashkernel();
- #endif
- }
- #ifdef CONFIG_SPARSEMEM_VMEMMAP
- int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
- struct vmem_altmap *altmap)
- {
- return vmemmap_populate_basepages(start, end, node, NULL);
- }
- #endif
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