536 строки
14 KiB
C
536 строки
14 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/pgtable.h>
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#include <asm/io.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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void *dtb_early_va;
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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_nodes(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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#ifdef 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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unsigned long size;
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if (initrd_start >= initrd_end) {
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pr_info("initrd not found or empty");
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goto disable;
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}
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if (__pa_symbol(initrd_end) > PFN_PHYS(max_low_pfn)) {
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pr_err("initrd extends beyond end of memory");
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goto disable;
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}
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size = initrd_end - initrd_start;
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memblock_reserve(__pa_symbol(initrd_start), 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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static phys_addr_t dtb_early_pa __initdata;
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void __init setup_bootmem(void)
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{
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struct memblock_region *reg;
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phys_addr_t mem_size = 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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/* Find the memory region containing the kernel */
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for_each_memblock(memory, reg) {
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phys_addr_t end = reg->base + reg->size;
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if (reg->base <= vmlinux_start && vmlinux_end <= end) {
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mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
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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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if (reg->base + mem_size < end)
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memblock_remove(reg->base + mem_size,
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end - reg->base - mem_size);
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}
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}
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BUG_ON(mem_size == 0);
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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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set_max_mapnr(PFN_DOWN(mem_size));
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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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#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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for_each_memblock(memory, reg) {
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unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
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unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
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memblock_set_node(PFN_PHYS(start_pfn),
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PFN_PHYS(end_pfn - start_pfn),
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&memblock.memory, 0);
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}
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}
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#ifdef CONFIG_MMU
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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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static bool mmu_enabled;
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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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}
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static pte_t *__init get_pte_virt(phys_addr_t pa)
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{
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if (mmu_enabled) {
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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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} else {
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return (pte_t *)((uintptr_t)pa);
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}
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}
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static phys_addr_t __init alloc_pte(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_ON(!mmu_enabled);
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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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_index = pte_index(va);
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BUG_ON(sz != PAGE_SIZE);
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if (pte_none(ptep[pte_index]))
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ptep[pte_index] = 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(phys_addr_t pa)
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{
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if (mmu_enabled) {
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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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} else {
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return (pmd_t *)((uintptr_t)pa);
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}
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}
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static phys_addr_t __init alloc_pmd(uintptr_t va)
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{
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uintptr_t pmd_num;
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if (mmu_enabled)
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return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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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 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_index = pmd_index(va);
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if (sz == PMD_SIZE) {
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if (pmd_none(pmdp[pmd_index]))
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pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pa), prot);
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return;
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}
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if (pmd_none(pmdp[pmd_index])) {
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pte_phys = alloc_pte(va);
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pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
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ptep = 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_index]));
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ptep = 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) alloc_pmd(__va)
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#define get_pgd_next_virt(__pa) 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) alloc_pte(__va)
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#define get_pgd_next_virt(__pa) 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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static 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_index = pgd_index(va);
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if (sz == PGDIR_SIZE) {
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if (pgd_val(pgdp[pgd_index]) == 0)
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pgdp[pgd_index] = pfn_pgd(PFN_DOWN(pa), prot);
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return;
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}
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if (pgd_val(pgdp[pgd_index]) == 0) {
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next_phys = alloc_pgd_next(va);
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pgdp[pgd_index] = 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_index]));
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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, 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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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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/* 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);
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/* Setup trampoline PGD and PMD */
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create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
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(uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
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create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
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load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
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#else
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/* Setup trampoline PGD */
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create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
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load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
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#endif
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/*
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* Setup early PGD covering entire kernel which will allows
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* us to reach paging_init(). We map all memory banks later
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* in setup_vm_final() below.
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*/
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end_va = PAGE_OFFSET + load_sz;
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for (va = PAGE_OFFSET; va < end_va; va += map_size)
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create_pgd_mapping(early_pg_dir, va,
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load_pa + (va - PAGE_OFFSET),
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map_size, PAGE_KERNEL_EXEC);
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/* Create fixed mapping for early FDT parsing */
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end_va = __fix_to_virt(FIX_FDT) + FIX_FDT_SIZE;
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for (va = __fix_to_virt(FIX_FDT); va < end_va; va += PAGE_SIZE)
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create_pte_mapping(fixmap_pte, va,
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dtb_pa + (va - __fix_to_virt(FIX_FDT)),
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PAGE_SIZE, PAGE_KERNEL);
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/* Save pointer to DTB for early FDT parsing */
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dtb_early_va = (void *)fix_to_virt(FIX_FDT) + (dtb_pa & ~PAGE_MASK);
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/* Save physical address for memblock reservation */
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dtb_early_pa = dtb_pa;
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}
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static void __init setup_vm_final(void)
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{
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uintptr_t va, map_size;
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phys_addr_t pa, start, end;
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struct memblock_region *reg;
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/* Set mmu_enabled flag */
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mmu_enabled = true;
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/* Setup swapper PGD for fixmap */
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create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
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__pa_symbol(fixmap_pgd_next),
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PGDIR_SIZE, PAGE_TABLE);
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/* Map all memory banks */
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for_each_memblock(memory, reg) {
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start = reg->base;
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end = start + reg->size;
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if (start >= end)
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break;
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if (memblock_is_nomap(reg))
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continue;
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if (start <= __pa(PAGE_OFFSET) &&
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__pa(PAGE_OFFSET) < end)
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start = __pa(PAGE_OFFSET);
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map_size = best_map_size(start, end - start);
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for (pa = start; pa < end; pa += map_size) {
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va = (uintptr_t)__va(pa);
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create_pgd_mapping(swapper_pg_dir, va, pa,
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map_size, PAGE_KERNEL_EXEC);
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}
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}
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/* Clear fixmap PTE and PMD mappings */
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clear_fixmap(FIX_PTE);
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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();
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long init_begin = (unsigned long)__init_begin;
|
|
unsigned long init_end = (unsigned long)__init_end;
|
|
|
|
/* Make the region as non-execuatble. */
|
|
set_memory_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT);
|
|
free_initmem_default(POISON_FREE_INITMEM);
|
|
}
|
|
|
|
#else
|
|
asmlinkage void __init setup_vm(uintptr_t dtb_pa)
|
|
{
|
|
dtb_early_va = (void *)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);
|
|
}
|
|
#endif
|
|
|
|
void __init paging_init(void)
|
|
{
|
|
setup_vm_final();
|
|
memblocks_present();
|
|
sparse_init();
|
|
setup_zero_page();
|
|
zone_sizes_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);
|
|
}
|
|
#endif
|