mirror of https://gitee.com/openkylin/linux.git
265 lines
7.0 KiB
C
265 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 1995-2005 Russell King
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// Copyright (C) 2012 ARM Ltd.
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// Copyright (C) 2013-2017 Andes Technology Corporation
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/highmem.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/tlb.h>
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#include <asm/page.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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DEFINE_SPINLOCK(anon_alias_lock);
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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/*
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* empty_zero_page is a special page that is used for
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* zero-initialized data and COW.
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*/
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struct page *empty_zero_page;
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EXPORT_SYMBOL(empty_zero_page);
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static void __init zone_sizes_init(void)
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{
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
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max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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max_zone_pfn[ZONE_HIGHMEM] = max_pfn;
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#endif
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free_area_init(max_zone_pfn);
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}
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/*
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* Map all physical memory under high_memory into kernel's address space.
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*
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* This is explicitly coded for two-level page tables, so if you need
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* something else then this needs to change.
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*/
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static void __init map_ram(void)
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{
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unsigned long v, p, e;
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pgd_t *pge;
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p4d_t *p4e;
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pud_t *pue;
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pmd_t *pme;
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pte_t *pte;
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/* These mark extents of read-only kernel pages...
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* ...from vmlinux.lds.S
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*/
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p = (u32) memblock_start_of_DRAM() & PAGE_MASK;
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e = min((u32) memblock_end_of_DRAM(), (u32) __pa(high_memory));
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v = (u32) __va(p);
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pge = pgd_offset_k(v);
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while (p < e) {
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int j;
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p4e = p4d_offset(pge, v);
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pue = pud_offset(p4e, v);
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pme = pmd_offset(pue, v);
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if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
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panic("%s: Kernel hardcoded for "
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"two-level page tables", __func__);
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}
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/* Alloc one page for holding PTE's... */
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pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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set_pmd(pme, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE));
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/* Fill the newly allocated page with PTE'S */
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for (j = 0; p < e && j < PTRS_PER_PTE;
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v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
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/* Create mapping between p and v. */
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/* TODO: more fine grant for page access permission */
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set_pte(pte, __pte(p + pgprot_val(PAGE_KERNEL)));
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}
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pge++;
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}
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}
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static pmd_t *fixmap_pmd_p;
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static void __init fixedrange_init(void)
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{
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unsigned long vaddr;
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pmd_t *pmd;
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#ifdef CONFIG_HIGHMEM
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pte_t *pte;
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#endif /* CONFIG_HIGHMEM */
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/*
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* Fixed mappings:
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*/
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
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pmd = pmd_off_k(vaddr);
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fixmap_pmd_p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!fixmap_pmd_p)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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set_pmd(pmd, __pmd(__pa(fixmap_pmd_p) + _PAGE_KERNEL_TABLE));
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#ifdef CONFIG_HIGHMEM
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/*
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* Permanent kmaps:
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*/
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vaddr = PKMAP_BASE;
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pmd = pmd_off_k(vaddr);
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pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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set_pmd(pmd, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE));
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pkmap_page_table = pte;
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#endif /* CONFIG_HIGHMEM */
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}
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/*
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* paging_init() sets up the page tables, initialises the zone memory
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* maps, and sets up the zero page, bad page and bad page tables.
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*/
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void __init paging_init(void)
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{
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int i;
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void *zero_page;
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pr_info("Setting up paging and PTEs.\n");
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/* clear out the init_mm.pgd that will contain the kernel's mappings */
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for (i = 0; i < PTRS_PER_PGD; i++)
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swapper_pg_dir[i] = __pgd(1);
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map_ram();
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fixedrange_init();
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/* allocate space for empty_zero_page */
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zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!zero_page)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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zone_sizes_init();
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empty_zero_page = virt_to_page(zero_page);
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flush_dcache_page(empty_zero_page);
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}
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static inline void __init free_highmem(void)
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{
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#ifdef CONFIG_HIGHMEM
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unsigned long pfn;
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for (pfn = PFN_UP(__pa(high_memory)); pfn < max_pfn; pfn++) {
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phys_addr_t paddr = (phys_addr_t) pfn << PAGE_SHIFT;
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if (!memblock_is_reserved(paddr))
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free_highmem_page(pfn_to_page(pfn));
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}
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#endif
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}
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static void __init set_max_mapnr_init(void)
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{
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max_mapnr = max_pfn;
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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much
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* memory is free. This is done after various parts of the system have
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* claimed their memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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phys_addr_t memory_start = memblock_start_of_DRAM();
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BUG_ON(!mem_map);
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set_max_mapnr_init();
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free_highmem();
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/* this will put all low memory onto the freelists */
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memblock_free_all();
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mem_init_print_info(NULL);
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pr_info("virtual kernel memory layout:\n"
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" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#ifdef CONFIG_HIGHMEM
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" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#endif
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" consist : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
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FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10,
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#ifdef CONFIG_HIGHMEM
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PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
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(LAST_PKMAP * PAGE_SIZE) >> 10,
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#endif
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CONSISTENT_BASE, CONSISTENT_END,
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((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START,
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(unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20,
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(unsigned long)__va(memory_start), (unsigned long)high_memory,
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((unsigned long)high_memory -
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(unsigned long)__va(memory_start)) >> 20,
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(unsigned long)&__init_begin, (unsigned long)&__init_end,
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((unsigned long)&__init_end -
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(unsigned long)&__init_begin) >> 10, (unsigned long)&_etext,
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(unsigned long)&_edata,
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((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
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(unsigned long)&_text, (unsigned long)&_etext,
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((unsigned long)&_etext - (unsigned long)&_text) >> 10);
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/*
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* Check boundaries twice: Some fundamental inconsistencies can
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* be detected at build time already.
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*/
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#ifdef CONFIG_HIGHMEM
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BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
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BUILD_BUG_ON((CONSISTENT_END) > PKMAP_BASE);
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#endif
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BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
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BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
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#ifdef CONFIG_HIGHMEM
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BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
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BUG_ON(CONSISTENT_END > PKMAP_BASE);
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#endif
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BUG_ON(VMALLOC_END > CONSISTENT_BASE);
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BUG_ON(VMALLOC_START >= VMALLOC_END);
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BUG_ON((unsigned long)high_memory > VMALLOC_START);
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return;
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}
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void __set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags)
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{
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unsigned long addr = __fix_to_virt(idx);
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pte_t *pte;
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BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
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pte = (pte_t *)&fixmap_pmd_p[pte_index(addr)];
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if (pgprot_val(flags)) {
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set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
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} else {
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pte_clear(&init_mm, addr, pte);
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flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
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}
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}
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