mirror of https://gitee.com/openkylin/linux.git
670 lines
18 KiB
C
670 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2019 Western Digital Corporation or its affiliates.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/initrd.h>
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#include <linux/swap.h>
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#include <linux/sizes.h>
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#include <linux/of_fdt.h>
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#include <linux/libfdt.h>
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#include <linux/set_memory.h>
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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#include <asm/sections.h>
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#include <asm/soc.h>
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#include <asm/io.h>
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#include <asm/ptdump.h>
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#include "../kernel/head.h"
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
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__page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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extern char _start[];
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#define DTB_EARLY_BASE_VA PGDIR_SIZE
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void *dtb_early_va __initdata;
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uintptr_t dtb_early_pa __initdata;
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struct pt_alloc_ops {
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pte_t *(*get_pte_virt)(phys_addr_t pa);
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phys_addr_t (*alloc_pte)(uintptr_t va);
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd_t *(*get_pmd_virt)(phys_addr_t pa);
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phys_addr_t (*alloc_pmd)(uintptr_t va);
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#endif
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};
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static void __init zone_sizes_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
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#ifdef CONFIG_ZONE_DMA32
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max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
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(unsigned long) PFN_PHYS(max_low_pfn)));
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init(max_zone_pfns);
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}
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static void setup_zero_page(void)
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{
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memset((void *)empty_zero_page, 0, PAGE_SIZE);
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}
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#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
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static inline void print_mlk(char *name, unsigned long b, unsigned long t)
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{
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pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
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(((t) - (b)) >> 10));
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}
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static inline void print_mlm(char *name, unsigned long b, unsigned long t)
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{
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pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
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(((t) - (b)) >> 20));
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}
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static void print_vm_layout(void)
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{
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pr_notice("Virtual kernel memory layout:\n");
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print_mlk("fixmap", (unsigned long)FIXADDR_START,
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(unsigned long)FIXADDR_TOP);
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print_mlm("pci io", (unsigned long)PCI_IO_START,
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(unsigned long)PCI_IO_END);
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print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
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(unsigned long)VMEMMAP_END);
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print_mlm("vmalloc", (unsigned long)VMALLOC_START,
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(unsigned long)VMALLOC_END);
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print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
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(unsigned long)high_memory);
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}
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#else
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static void print_vm_layout(void) { }
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#endif /* CONFIG_DEBUG_VM */
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void __init mem_init(void)
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{
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#ifdef CONFIG_FLATMEM
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BUG_ON(!mem_map);
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#endif /* CONFIG_FLATMEM */
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high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
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memblock_free_all();
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mem_init_print_info(NULL);
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print_vm_layout();
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static void __init setup_initrd(void)
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{
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phys_addr_t start;
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unsigned long size;
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/* Ignore the virtul address computed during device tree parsing */
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initrd_start = initrd_end = 0;
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if (!phys_initrd_size)
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return;
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/*
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* Round the memory region to page boundaries as per free_initrd_mem()
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* This allows us to detect whether the pages overlapping the initrd
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* are in use, but more importantly, reserves the entire set of pages
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* as we don't want these pages allocated for other purposes.
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*/
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start = round_down(phys_initrd_start, PAGE_SIZE);
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size = phys_initrd_size + (phys_initrd_start - start);
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size = round_up(size, PAGE_SIZE);
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if (!memblock_is_region_memory(start, size)) {
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pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region",
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(u64)start, size);
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goto disable;
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}
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if (memblock_is_region_reserved(start, size)) {
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pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n",
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(u64)start, size);
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goto disable;
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}
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memblock_reserve(start, size);
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/* Now convert initrd to virtual addresses */
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initrd_start = (unsigned long)__va(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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initrd_below_start_ok = 1;
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pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
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(void *)(initrd_start), size);
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return;
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disable:
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pr_cont(" - disabling initrd\n");
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initrd_start = 0;
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initrd_end = 0;
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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void __init setup_bootmem(void)
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{
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phys_addr_t mem_size = 0;
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phys_addr_t total_mem = 0;
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phys_addr_t mem_start, start, end = 0;
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phys_addr_t vmlinux_end = __pa_symbol(&_end);
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phys_addr_t vmlinux_start = __pa_symbol(&_start);
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u64 i;
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/* Find the memory region containing the kernel */
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for_each_mem_range(i, &start, &end) {
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phys_addr_t size = end - start;
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if (!total_mem)
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mem_start = start;
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if (start <= vmlinux_start && vmlinux_end <= end)
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BUG_ON(size == 0);
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total_mem = total_mem + size;
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}
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/*
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* Remove memblock from the end of usable area to the
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* end of region
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*/
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mem_size = min(total_mem, (phys_addr_t)-PAGE_OFFSET);
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if (mem_start + mem_size < end)
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memblock_remove(mem_start + mem_size,
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end - mem_start - mem_size);
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/* Reserve from the start of the kernel to the end of the kernel */
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memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
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max_pfn = PFN_DOWN(memblock_end_of_DRAM());
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max_low_pfn = max_pfn;
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set_max_mapnr(max_low_pfn);
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#ifdef CONFIG_BLK_DEV_INITRD
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setup_initrd();
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#endif /* CONFIG_BLK_DEV_INITRD */
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/*
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* Avoid using early_init_fdt_reserve_self() since __pa() does
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* not work for DTB pointers that are fixmap addresses
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*/
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memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
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early_init_fdt_scan_reserved_mem();
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memblock_allow_resize();
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memblock_dump_all();
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}
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#ifdef CONFIG_MMU
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static struct pt_alloc_ops pt_ops;
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unsigned long va_pa_offset;
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EXPORT_SYMBOL(va_pa_offset);
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unsigned long pfn_base;
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EXPORT_SYMBOL(pfn_base);
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
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#define MAX_EARLY_MAPPING_SIZE SZ_128M
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pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
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void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
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{
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unsigned long addr = __fix_to_virt(idx);
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pte_t *ptep;
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BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
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ptep = &fixmap_pte[pte_index(addr)];
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if (pgprot_val(prot))
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set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
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else
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pte_clear(&init_mm, addr, ptep);
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local_flush_tlb_page(addr);
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}
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static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
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{
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return (pte_t *)((uintptr_t)pa);
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}
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static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
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{
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clear_fixmap(FIX_PTE);
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return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
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}
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static inline pte_t *get_pte_virt_late(phys_addr_t pa)
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{
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return (pte_t *) __va(pa);
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}
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static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
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{
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/*
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* We only create PMD or PGD early mappings so we
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* should never reach here with MMU disabled.
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*/
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BUG();
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}
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static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
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{
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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}
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static phys_addr_t alloc_pte_late(uintptr_t va)
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{
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unsigned long vaddr;
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vaddr = __get_free_page(GFP_KERNEL);
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if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
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BUG();
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return __pa(vaddr);
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}
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static void __init create_pte_mapping(pte_t *ptep,
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uintptr_t va, phys_addr_t pa,
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phys_addr_t sz, pgprot_t prot)
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{
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uintptr_t pte_idx = pte_index(va);
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BUG_ON(sz != PAGE_SIZE);
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if (pte_none(ptep[pte_idx]))
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ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
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}
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
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pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
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#if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
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#define NUM_EARLY_PMDS 1UL
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#else
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#define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
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#endif
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pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
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static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
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{
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/* Before MMU is enabled */
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return (pmd_t *)((uintptr_t)pa);
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}
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static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
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{
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clear_fixmap(FIX_PMD);
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return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
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}
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static pmd_t *get_pmd_virt_late(phys_addr_t pa)
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{
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return (pmd_t *) __va(pa);
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}
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static phys_addr_t __init alloc_pmd_early(uintptr_t va)
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{
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uintptr_t pmd_num;
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pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT;
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BUG_ON(pmd_num >= NUM_EARLY_PMDS);
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return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD];
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}
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static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
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{
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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}
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static phys_addr_t alloc_pmd_late(uintptr_t va)
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{
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unsigned long vaddr;
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vaddr = __get_free_page(GFP_KERNEL);
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BUG_ON(!vaddr);
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return __pa(vaddr);
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}
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static void __init create_pmd_mapping(pmd_t *pmdp,
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uintptr_t va, phys_addr_t pa,
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phys_addr_t sz, pgprot_t prot)
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{
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pte_t *ptep;
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phys_addr_t pte_phys;
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uintptr_t pmd_idx = pmd_index(va);
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if (sz == PMD_SIZE) {
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if (pmd_none(pmdp[pmd_idx]))
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pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
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return;
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}
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if (pmd_none(pmdp[pmd_idx])) {
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pte_phys = pt_ops.alloc_pte(va);
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pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
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ptep = pt_ops.get_pte_virt(pte_phys);
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memset(ptep, 0, PAGE_SIZE);
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} else {
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pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
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ptep = pt_ops.get_pte_virt(pte_phys);
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}
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create_pte_mapping(ptep, va, pa, sz, prot);
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}
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#define pgd_next_t pmd_t
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#define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
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#define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
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#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
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create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
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#define fixmap_pgd_next fixmap_pmd
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#else
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#define pgd_next_t pte_t
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#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
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#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
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#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
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create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
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#define fixmap_pgd_next fixmap_pte
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#endif
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void __init create_pgd_mapping(pgd_t *pgdp,
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uintptr_t va, phys_addr_t pa,
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phys_addr_t sz, pgprot_t prot)
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{
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pgd_next_t *nextp;
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phys_addr_t next_phys;
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uintptr_t pgd_idx = pgd_index(va);
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if (sz == PGDIR_SIZE) {
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if (pgd_val(pgdp[pgd_idx]) == 0)
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pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
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return;
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}
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if (pgd_val(pgdp[pgd_idx]) == 0) {
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next_phys = alloc_pgd_next(va);
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pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
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nextp = get_pgd_next_virt(next_phys);
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memset(nextp, 0, PAGE_SIZE);
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} else {
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next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
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nextp = get_pgd_next_virt(next_phys);
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}
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create_pgd_next_mapping(nextp, va, pa, sz, prot);
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}
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static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
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{
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/* Upgrade to PMD_SIZE mappings whenever possible */
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if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
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return PAGE_SIZE;
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return PMD_SIZE;
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}
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/*
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* setup_vm() is called from head.S with MMU-off.
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*
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* Following requirements should be honoured for setup_vm() to work
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* correctly:
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* 1) It should use PC-relative addressing for accessing kernel symbols.
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* To achieve this we always use GCC cmodel=medany.
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* 2) The compiler instrumentation for FTRACE will not work for setup_vm()
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* so disable compiler instrumentation when FTRACE is enabled.
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*
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* Currently, the above requirements are honoured by using custom CFLAGS
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* for init.o in mm/Makefile.
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*/
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#ifndef __riscv_cmodel_medany
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#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
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#endif
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asmlinkage void __init setup_vm(uintptr_t dtb_pa)
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{
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uintptr_t va, pa, end_va;
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uintptr_t load_pa = (uintptr_t)(&_start);
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uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
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uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE);
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd_t fix_bmap_spmd, fix_bmap_epmd;
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#endif
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va_pa_offset = PAGE_OFFSET - load_pa;
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pfn_base = PFN_DOWN(load_pa);
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/*
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* Enforce boot alignment requirements of RV32 and
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* RV64 by only allowing PMD or PGD mappings.
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*/
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BUG_ON(map_size == PAGE_SIZE);
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/* Sanity check alignment and size */
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BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
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BUG_ON((load_pa % map_size) != 0);
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BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);
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pt_ops.alloc_pte = alloc_pte_early;
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pt_ops.get_pte_virt = get_pte_virt_early;
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#ifndef __PAGETABLE_PMD_FOLDED
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pt_ops.alloc_pmd = alloc_pmd_early;
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pt_ops.get_pmd_virt = get_pmd_virt_early;
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#endif
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/* Setup early PGD for fixmap */
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create_pgd_mapping(early_pg_dir, FIXADDR_START,
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(uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
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#ifndef __PAGETABLE_PMD_FOLDED
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/* Setup fixmap PMD */
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create_pmd_mapping(fixmap_pmd, FIXADDR_START,
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(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);
|
|
|
|
/* 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));
|
|
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();
|
|
sparse_init();
|
|
setup_zero_page();
|
|
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
|