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arm64: MMU initialisation
This patch contains the initialisation of the memory blocks, MMU attributes and the memory map. Only five memory types are defined: Device nGnRnE (equivalent to Strongly Ordered), Device nGnRE (classic Device memory), Device GRE, Normal Non-cacheable and Normal Cacheable. Cache policies are supported via the memory attributes register (MAIR_EL1) and only affect the Normal Cacheable mappings. This patch also adds the SPARSEMEM_VMEMMAP initialisation. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Catalin Marinas
parent
4f04d8f005
commit
c1cc155261
21
arch/arm64/include/asm/memblock.h
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21
arch/arm64/include/asm/memblock.h
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/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_MEMBLOCK_H
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#define __ASM_MEMBLOCK_H
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extern void arm64_memblock_init(void);
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#endif
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437
arch/arm64/mm/init.c
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437
arch/arm64/mm/init.c
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/*
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* Based on arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/export.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/bootmem.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/gfp.h>
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#include <linux/memblock.h>
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#include <linux/sort.h>
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#include <linux/of_fdt.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include "mm.h"
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static unsigned long phys_initrd_start __initdata = 0;
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static unsigned long phys_initrd_size __initdata = 0;
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phys_addr_t memstart_addr __read_mostly = 0;
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void __init early_init_dt_setup_initrd_arch(unsigned long start,
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unsigned long end)
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{
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phys_initrd_start = start;
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phys_initrd_size = end - start;
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}
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static int __init early_initrd(char *p)
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{
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unsigned long start, size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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phys_initrd_start = start;
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phys_initrd_size = size;
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT)
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static void __init zone_sizes_init(unsigned long min, unsigned long max)
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{
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struct memblock_region *reg;
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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unsigned long max_dma32 = min;
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memset(zone_size, 0, sizeof(zone_size));
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#ifdef CONFIG_ZONE_DMA32
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/* 4GB maximum for 32-bit only capable devices */
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max_dma32 = min(max, MAX_DMA32_PFN);
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zone_size[ZONE_DMA32] = max_dma32 - min;
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#endif
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zone_size[ZONE_NORMAL] = max - max_dma32;
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memcpy(zhole_size, zone_size, sizeof(zhole_size));
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (start >= max)
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continue;
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#ifdef CONFIG_ZONE_DMA32
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if (start < max_dma32) {
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unsigned long dma_end = min(end, max_dma32);
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zhole_size[ZONE_DMA32] -= dma_end - start;
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}
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#endif
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if (end > max_dma32) {
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unsigned long normal_end = min(end, max);
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unsigned long normal_start = max(start, max_dma32);
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zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
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}
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}
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free_area_init_node(0, zone_size, min, zhole_size);
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}
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#ifdef CONFIG_HAVE_ARCH_PFN_VALID
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int pfn_valid(unsigned long pfn)
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{
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return memblock_is_memory(pfn << PAGE_SHIFT);
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}
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EXPORT_SYMBOL(pfn_valid);
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#endif
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#ifndef CONFIG_SPARSEMEM
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static void arm64_memory_present(void)
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{
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}
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#else
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static void arm64_memory_present(void)
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{
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struct memblock_region *reg;
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for_each_memblock(memory, reg)
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memory_present(0, memblock_region_memory_base_pfn(reg),
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memblock_region_memory_end_pfn(reg));
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}
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#endif
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void __init arm64_memblock_init(void)
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{
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u64 *reserve_map, base, size;
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/* Register the kernel text, kernel data and initrd with memblock */
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memblock_reserve(__pa(_text), _end - _text);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (phys_initrd_size) {
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memblock_reserve(phys_initrd_start, phys_initrd_size);
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/* Now convert initrd to virtual addresses */
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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#endif
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/*
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* Reserve the page tables. These are already in use,
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* and can only be in node 0.
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*/
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memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE);
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memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
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/* Reserve the dtb region */
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memblock_reserve(virt_to_phys(initial_boot_params),
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be32_to_cpu(initial_boot_params->totalsize));
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/*
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* Process the reserve map. This will probably overlap the initrd
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* and dtb locations which are already reserved, but overlapping
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* doesn't hurt anything
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*/
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reserve_map = ((void*)initial_boot_params) +
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be32_to_cpu(initial_boot_params->off_mem_rsvmap);
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while (1) {
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base = be64_to_cpup(reserve_map++);
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size = be64_to_cpup(reserve_map++);
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if (!size)
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break;
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memblock_reserve(base, size);
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}
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memblock_allow_resize();
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memblock_dump_all();
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}
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void __init bootmem_init(void)
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{
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unsigned long min, max;
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min = PFN_UP(memblock_start_of_DRAM());
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max = PFN_DOWN(memblock_end_of_DRAM());
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/*
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* Sparsemem tries to allocate bootmem in memory_present(), so must be
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* done after the fixed reservations.
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*/
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arm64_memory_present();
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sparse_init();
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zone_sizes_init(min, max);
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high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
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max_pfn = max_low_pfn = max;
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}
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static inline int free_area(unsigned long pfn, unsigned long end, char *s)
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{
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unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
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for (; pfn < end; pfn++) {
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struct page *page = pfn_to_page(pfn);
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ClearPageReserved(page);
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init_page_count(page);
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__free_page(page);
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pages++;
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}
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if (size && s)
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pr_info("Freeing %s memory: %dK\n", s, size);
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return pages;
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}
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/*
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* Poison init memory with an undefined instruction (0x0).
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*/
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static inline void poison_init_mem(void *s, size_t count)
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{
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memset(s, 0, count);
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}
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#ifndef CONFIG_SPARSEMEM_VMEMMAP
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static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
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{
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struct page *start_pg, *end_pg;
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unsigned long pg, pgend;
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/*
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* Convert start_pfn/end_pfn to a struct page pointer.
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*/
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start_pg = pfn_to_page(start_pfn - 1) + 1;
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end_pg = pfn_to_page(end_pfn - 1) + 1;
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/*
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* Convert to physical addresses, and round start upwards and end
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* downwards.
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*/
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pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
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pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
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/*
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* If there are free pages between these, free the section of the
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* memmap array.
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*/
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if (pg < pgend)
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free_bootmem(pg, pgend - pg);
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}
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/*
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* The mem_map array can get very big. Free the unused area of the memory map.
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*/
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static void __init free_unused_memmap(void)
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{
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unsigned long start, prev_end = 0;
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struct memblock_region *reg;
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for_each_memblock(memory, reg) {
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start = __phys_to_pfn(reg->base);
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#ifdef CONFIG_SPARSEMEM
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/*
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* Take care not to free memmap entries that don't exist due
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* to SPARSEMEM sections which aren't present.
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*/
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start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
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#endif
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/*
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* If we had a previous bank, and there is a space between the
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* current bank and the previous, free it.
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*/
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if (prev_end && prev_end < start)
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free_memmap(prev_end, start);
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/*
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* Align up here since the VM subsystem insists that the
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* memmap entries are valid from the bank end aligned to
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* MAX_ORDER_NR_PAGES.
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*/
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prev_end = ALIGN(start + __phys_to_pfn(reg->size),
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MAX_ORDER_NR_PAGES);
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}
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#ifdef CONFIG_SPARSEMEM
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if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
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free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
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#endif
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}
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#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much memory
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* is free. This is done after various parts of the system have claimed their
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* 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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unsigned long reserved_pages, free_pages;
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struct memblock_region *reg;
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#if CONFIG_SWIOTLB
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extern void __init arm64_swiotlb_init(size_t max_size);
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arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1));
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#endif
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max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
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#ifndef CONFIG_SPARSEMEM_VMEMMAP
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/* this will put all unused low memory onto the freelists */
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free_unused_memmap();
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#endif
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totalram_pages += free_all_bootmem();
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reserved_pages = free_pages = 0;
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for_each_memblock(memory, reg) {
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unsigned int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = __phys_to_pfn(reg->base);
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pfn2 = pfn1 + __phys_to_pfn(reg->size);
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page = pfn_to_page(pfn1);
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end = pfn_to_page(pfn2 - 1) + 1;
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do {
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if (PageReserved(page))
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reserved_pages++;
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else if (!page_count(page))
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free_pages++;
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page++;
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} while (page < end);
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}
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/*
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* Since our memory may not be contiguous, calculate the real number
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* of pages we have in this system.
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*/
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pr_info("Memory:");
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num_physpages = 0;
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for_each_memblock(memory, reg) {
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unsigned long pages = memblock_region_memory_end_pfn(reg) -
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memblock_region_memory_base_pfn(reg);
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num_physpages += pages;
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printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
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}
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printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
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pr_notice("Memory: %luk/%luk available, %luk reserved\n",
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nr_free_pages() << (PAGE_SHIFT-10),
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free_pages << (PAGE_SHIFT-10),
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reserved_pages << (PAGE_SHIFT-10));
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#define MLK(b, t) b, t, ((t) - (b)) >> 10
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#define MLM(b, t) b, t, ((t) - (b)) >> 20
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#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
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pr_notice("Virtual kernel memory layout:\n"
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" vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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" vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
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#endif
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" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
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" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
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" .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
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" .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
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" .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
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MLM(VMALLOC_START, VMALLOC_END),
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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MLM((unsigned long)virt_to_page(PAGE_OFFSET),
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(unsigned long)virt_to_page(high_memory)),
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#endif
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MLM(MODULES_VADDR, MODULES_END),
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MLM(PAGE_OFFSET, (unsigned long)high_memory),
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MLK_ROUNDUP(__init_begin, __init_end),
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MLK_ROUNDUP(_text, _etext),
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MLK_ROUNDUP(_sdata, _edata));
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#undef MLK
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#undef MLM
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#undef MLK_ROUNDUP
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/*
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* Check boundaries twice: Some fundamental inconsistencies can be
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* detected at build time already.
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*/
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#ifdef CONFIG_COMPAT
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BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
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#endif
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BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
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BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
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if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
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extern int sysctl_overcommit_memory;
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/*
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* On a machine this small we won't get anywhere without
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* overcommit, so turn it on by default.
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*/
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sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
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}
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}
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void free_initmem(void)
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{
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poison_init_mem(__init_begin, __init_end - __init_begin);
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totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
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__phys_to_pfn(__pa(__init_end)),
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"init");
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static int keep_initrd;
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (!keep_initrd) {
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poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
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totalram_pages += free_area(__phys_to_pfn(__pa(start)),
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__phys_to_pfn(__pa(end)),
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"initrd");
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}
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}
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static int __init keepinitrd_setup(char *__unused)
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{
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keep_initrd = 1;
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return 1;
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}
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||||
__setup("keepinitrd", keepinitrd_setup);
|
||||
#endif
|
||||
395
arch/arm64/mm/mmu.c
Normal file
395
arch/arm64/mm/mmu.c
Normal file
@ -0,0 +1,395 @@
|
||||
/*
|
||||
* Based on arch/arm/mm/mmu.c
|
||||
*
|
||||
* Copyright (C) 1995-2005 Russell King
|
||||
* Copyright (C) 2012 ARM Ltd.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <linux/export.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/mman.h>
|
||||
#include <linux/nodemask.h>
|
||||
#include <linux/memblock.h>
|
||||
#include <linux/fs.h>
|
||||
|
||||
#include <asm/cputype.h>
|
||||
#include <asm/sections.h>
|
||||
#include <asm/setup.h>
|
||||
#include <asm/sizes.h>
|
||||
#include <asm/tlb.h>
|
||||
#include <asm/mmu_context.h>
|
||||
|
||||
#include "mm.h"
|
||||
|
||||
/*
|
||||
* Empty_zero_page is a special page that is used for zero-initialized data
|
||||
* and COW.
|
||||
*/
|
||||
struct page *empty_zero_page;
|
||||
EXPORT_SYMBOL(empty_zero_page);
|
||||
|
||||
pgprot_t pgprot_default;
|
||||
EXPORT_SYMBOL(pgprot_default);
|
||||
|
||||
static pmdval_t prot_sect_kernel;
|
||||
|
||||
struct cachepolicy {
|
||||
const char policy[16];
|
||||
u64 mair;
|
||||
u64 tcr;
|
||||
};
|
||||
|
||||
static struct cachepolicy cache_policies[] __initdata = {
|
||||
{
|
||||
.policy = "uncached",
|
||||
.mair = 0x44, /* inner, outer non-cacheable */
|
||||
.tcr = TCR_IRGN_NC | TCR_ORGN_NC,
|
||||
}, {
|
||||
.policy = "writethrough",
|
||||
.mair = 0xaa, /* inner, outer write-through, read-allocate */
|
||||
.tcr = TCR_IRGN_WT | TCR_ORGN_WT,
|
||||
}, {
|
||||
.policy = "writeback",
|
||||
.mair = 0xee, /* inner, outer write-back, read-allocate */
|
||||
.tcr = TCR_IRGN_WBnWA | TCR_ORGN_WBnWA,
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* These are useful for identifying cache coherency problems by allowing the
|
||||
* cache or the cache and writebuffer to be turned off. It changes the Normal
|
||||
* memory caching attributes in the MAIR_EL1 register.
|
||||
*/
|
||||
static int __init early_cachepolicy(char *p)
|
||||
{
|
||||
int i;
|
||||
u64 tmp;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(cache_policies); i++) {
|
||||
int len = strlen(cache_policies[i].policy);
|
||||
|
||||
if (memcmp(p, cache_policies[i].policy, len) == 0)
|
||||
break;
|
||||
}
|
||||
if (i == ARRAY_SIZE(cache_policies)) {
|
||||
pr_err("ERROR: unknown or unsupported cache policy: %s\n", p);
|
||||
return 0;
|
||||
}
|
||||
|
||||
flush_cache_all();
|
||||
|
||||
/*
|
||||
* Modify MT_NORMAL attributes in MAIR_EL1.
|
||||
*/
|
||||
asm volatile(
|
||||
" mrs %0, mair_el1\n"
|
||||
" bfi %0, %1, #%2, #8\n"
|
||||
" msr mair_el1, %0\n"
|
||||
" isb\n"
|
||||
: "=&r" (tmp)
|
||||
: "r" (cache_policies[i].mair), "i" (MT_NORMAL * 8));
|
||||
|
||||
/*
|
||||
* Modify TCR PTW cacheability attributes.
|
||||
*/
|
||||
asm volatile(
|
||||
" mrs %0, tcr_el1\n"
|
||||
" bic %0, %0, %2\n"
|
||||
" orr %0, %0, %1\n"
|
||||
" msr tcr_el1, %0\n"
|
||||
" isb\n"
|
||||
: "=&r" (tmp)
|
||||
: "r" (cache_policies[i].tcr), "r" (TCR_IRGN_MASK | TCR_ORGN_MASK));
|
||||
|
||||
flush_cache_all();
|
||||
|
||||
return 0;
|
||||
}
|
||||
early_param("cachepolicy", early_cachepolicy);
|
||||
|
||||
/*
|
||||
* Adjust the PMD section entries according to the CPU in use.
|
||||
*/
|
||||
static void __init init_mem_pgprot(void)
|
||||
{
|
||||
pteval_t default_pgprot;
|
||||
int i;
|
||||
|
||||
default_pgprot = PTE_ATTRINDX(MT_NORMAL);
|
||||
prot_sect_kernel = PMD_TYPE_SECT | PMD_SECT_AF | PMD_ATTRINDX(MT_NORMAL);
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
/*
|
||||
* Mark memory with the "shared" attribute for SMP systems
|
||||
*/
|
||||
default_pgprot |= PTE_SHARED;
|
||||
prot_sect_kernel |= PMD_SECT_S;
|
||||
#endif
|
||||
|
||||
for (i = 0; i < 16; i++) {
|
||||
unsigned long v = pgprot_val(protection_map[i]);
|
||||
protection_map[i] = __pgprot(v | default_pgprot);
|
||||
}
|
||||
|
||||
pgprot_default = __pgprot(PTE_TYPE_PAGE | PTE_AF | default_pgprot);
|
||||
}
|
||||
|
||||
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
|
||||
unsigned long size, pgprot_t vma_prot)
|
||||
{
|
||||
if (!pfn_valid(pfn))
|
||||
return pgprot_noncached(vma_prot);
|
||||
else if (file->f_flags & O_SYNC)
|
||||
return pgprot_writecombine(vma_prot);
|
||||
return vma_prot;
|
||||
}
|
||||
EXPORT_SYMBOL(phys_mem_access_prot);
|
||||
|
||||
static void __init *early_alloc(unsigned long sz)
|
||||
{
|
||||
void *ptr = __va(memblock_alloc(sz, sz));
|
||||
memset(ptr, 0, sz);
|
||||
return ptr;
|
||||
}
|
||||
|
||||
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
|
||||
unsigned long end, unsigned long pfn)
|
||||
{
|
||||
pte_t *pte;
|
||||
|
||||
if (pmd_none(*pmd)) {
|
||||
pte = early_alloc(PTRS_PER_PTE * sizeof(pte_t));
|
||||
__pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE);
|
||||
}
|
||||
BUG_ON(pmd_bad(*pmd));
|
||||
|
||||
pte = pte_offset_kernel(pmd, addr);
|
||||
do {
|
||||
set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
|
||||
pfn++;
|
||||
} while (pte++, addr += PAGE_SIZE, addr != end);
|
||||
}
|
||||
|
||||
static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
|
||||
unsigned long end, phys_addr_t phys)
|
||||
{
|
||||
pmd_t *pmd;
|
||||
unsigned long next;
|
||||
|
||||
/*
|
||||
* Check for initial section mappings in the pgd/pud and remove them.
|
||||
*/
|
||||
if (pud_none(*pud) || pud_bad(*pud)) {
|
||||
pmd = early_alloc(PTRS_PER_PMD * sizeof(pmd_t));
|
||||
pud_populate(&init_mm, pud, pmd);
|
||||
}
|
||||
|
||||
pmd = pmd_offset(pud, addr);
|
||||
do {
|
||||
next = pmd_addr_end(addr, end);
|
||||
/* try section mapping first */
|
||||
if (((addr | next | phys) & ~SECTION_MASK) == 0)
|
||||
set_pmd(pmd, __pmd(phys | prot_sect_kernel));
|
||||
else
|
||||
alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys));
|
||||
phys += next - addr;
|
||||
} while (pmd++, addr = next, addr != end);
|
||||
}
|
||||
|
||||
static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
|
||||
unsigned long end, unsigned long phys)
|
||||
{
|
||||
pud_t *pud = pud_offset(pgd, addr);
|
||||
unsigned long next;
|
||||
|
||||
do {
|
||||
next = pud_addr_end(addr, end);
|
||||
alloc_init_pmd(pud, addr, next, phys);
|
||||
phys += next - addr;
|
||||
} while (pud++, addr = next, addr != end);
|
||||
}
|
||||
|
||||
/*
|
||||
* Create the page directory entries and any necessary page tables for the
|
||||
* mapping specified by 'md'.
|
||||
*/
|
||||
static void __init create_mapping(phys_addr_t phys, unsigned long virt,
|
||||
phys_addr_t size)
|
||||
{
|
||||
unsigned long addr, length, end, next;
|
||||
pgd_t *pgd;
|
||||
|
||||
if (virt < VMALLOC_START) {
|
||||
pr_warning("BUG: not creating mapping for 0x%016llx at 0x%016lx - outside kernel range\n",
|
||||
phys, virt);
|
||||
return;
|
||||
}
|
||||
|
||||
addr = virt & PAGE_MASK;
|
||||
length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
|
||||
|
||||
pgd = pgd_offset_k(addr);
|
||||
end = addr + length;
|
||||
do {
|
||||
next = pgd_addr_end(addr, end);
|
||||
alloc_init_pud(pgd, addr, next, phys);
|
||||
phys += next - addr;
|
||||
} while (pgd++, addr = next, addr != end);
|
||||
}
|
||||
|
||||
static void __init map_mem(void)
|
||||
{
|
||||
struct memblock_region *reg;
|
||||
|
||||
/* map all the memory banks */
|
||||
for_each_memblock(memory, reg) {
|
||||
phys_addr_t start = reg->base;
|
||||
phys_addr_t end = start + reg->size;
|
||||
|
||||
if (start >= end)
|
||||
break;
|
||||
|
||||
create_mapping(start, __phys_to_virt(start), end - start);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* paging_init() sets up the page tables, initialises the zone memory
|
||||
* maps and sets up the zero page.
|
||||
*/
|
||||
void __init paging_init(void)
|
||||
{
|
||||
void *zero_page;
|
||||
|
||||
/*
|
||||
* Maximum PGDIR_SIZE addressable via the initial direct kernel
|
||||
* mapping in swapper_pg_dir.
|
||||
*/
|
||||
memblock_set_current_limit((PHYS_OFFSET & PGDIR_MASK) + PGDIR_SIZE);
|
||||
|
||||
init_mem_pgprot();
|
||||
map_mem();
|
||||
|
||||
/*
|
||||
* Finally flush the caches and tlb to ensure that we're in a
|
||||
* consistent state.
|
||||
*/
|
||||
flush_cache_all();
|
||||
flush_tlb_all();
|
||||
|
||||
/* allocate the zero page. */
|
||||
zero_page = early_alloc(PAGE_SIZE);
|
||||
|
||||
bootmem_init();
|
||||
|
||||
empty_zero_page = virt_to_page(zero_page);
|
||||
__flush_dcache_page(empty_zero_page);
|
||||
|
||||
/*
|
||||
* TTBR0 is only used for the identity mapping at this stage. Make it
|
||||
* point to zero page to avoid speculatively fetching new entries.
|
||||
*/
|
||||
cpu_set_reserved_ttbr0();
|
||||
flush_tlb_all();
|
||||
}
|
||||
|
||||
/*
|
||||
* Enable the identity mapping to allow the MMU disabling.
|
||||
*/
|
||||
void setup_mm_for_reboot(void)
|
||||
{
|
||||
cpu_switch_mm(idmap_pg_dir, &init_mm);
|
||||
flush_tlb_all();
|
||||
}
|
||||
|
||||
/*
|
||||
* Check whether a kernel address is valid (derived from arch/x86/).
|
||||
*/
|
||||
int kern_addr_valid(unsigned long addr)
|
||||
{
|
||||
pgd_t *pgd;
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
pte_t *pte;
|
||||
|
||||
if ((((long)addr) >> VA_BITS) != -1UL)
|
||||
return 0;
|
||||
|
||||
pgd = pgd_offset_k(addr);
|
||||
if (pgd_none(*pgd))
|
||||
return 0;
|
||||
|
||||
pud = pud_offset(pgd, addr);
|
||||
if (pud_none(*pud))
|
||||
return 0;
|
||||
|
||||
pmd = pmd_offset(pud, addr);
|
||||
if (pmd_none(*pmd))
|
||||
return 0;
|
||||
|
||||
pte = pte_offset_kernel(pmd, addr);
|
||||
if (pte_none(*pte))
|
||||
return 0;
|
||||
|
||||
return pfn_valid(pte_pfn(*pte));
|
||||
}
|
||||
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
||||
#ifdef CONFIG_ARM64_64K_PAGES
|
||||
int __meminit vmemmap_populate(struct page *start_page,
|
||||
unsigned long size, int node)
|
||||
{
|
||||
return vmemmap_populate_basepages(start_page, size, node);
|
||||
}
|
||||
#else /* !CONFIG_ARM64_64K_PAGES */
|
||||
int __meminit vmemmap_populate(struct page *start_page,
|
||||
unsigned long size, int node)
|
||||
{
|
||||
unsigned long addr = (unsigned long)start_page;
|
||||
unsigned long end = (unsigned long)(start_page + size);
|
||||
unsigned long next;
|
||||
pgd_t *pgd;
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
|
||||
do {
|
||||
next = pmd_addr_end(addr, end);
|
||||
|
||||
pgd = vmemmap_pgd_populate(addr, node);
|
||||
if (!pgd)
|
||||
return -ENOMEM;
|
||||
|
||||
pud = vmemmap_pud_populate(pgd, addr, node);
|
||||
if (!pud)
|
||||
return -ENOMEM;
|
||||
|
||||
pmd = pmd_offset(pud, addr);
|
||||
if (pmd_none(*pmd)) {
|
||||
void *p = NULL;
|
||||
|
||||
p = vmemmap_alloc_block_buf(PMD_SIZE, node);
|
||||
if (!p)
|
||||
return -ENOMEM;
|
||||
|
||||
set_pmd(pmd, __pmd(__pa(p) | prot_sect_kernel));
|
||||
} else
|
||||
vmemmap_verify((pte_t *)pmd, node, addr, next);
|
||||
} while (addr = next, addr != end);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif /* CONFIG_ARM64_64K_PAGES */
|
||||
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|
||||
Loading…
x
Reference in New Issue
Block a user