diff options
Diffstat (limited to 'arch/riscv/mm/init.c')
| -rw-r--r-- | arch/riscv/mm/init.c | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c new file mode 100644 index 000000000..6c2f38aac --- /dev/null +++ b/arch/riscv/mm/init.c @@ -0,0 +1,687 @@ +// 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. + */ + +#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/libfdt.h> +#include <linux/set_memory.h> +#include <linux/dma-map-ops.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 phys_addr_t dma32_phys_limit __ro_after_init; + +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(dma32_phys_limit); +#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; + dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_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)); + + dma_contiguous_reserve(dma32_phys_limit); + 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 + +static void __init resource_init(void) +{ + struct memblock_region *region; + + for_each_mem_region(region) { + struct resource *res; + + res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); + if (!res) + panic("%s: Failed to allocate %zu bytes\n", __func__, + sizeof(struct resource)); + + if (memblock_is_nomap(region)) { + res->name = "reserved"; + res->flags = IORESOURCE_MEM; + } else { + res->name = "System RAM"; + res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + } + res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; + + request_resource(&iomem_resource, res); + } +} + +void __init paging_init(void) +{ + setup_vm_final(); + setup_zero_page(); +} + +void __init misc_mem_init(void) +{ + sparse_init(); + zone_sizes_init(); + resource_init(); +} + +#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 |