375 lines
9.5 KiB
C
375 lines
9.5 KiB
C
/*
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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 <linux/dma-mapping.h>
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#include <linux/dma-contiguous.h>
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#include <linux/efi.h>
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#include <linux/swiotlb.h>
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#include <asm/fixmap.h>
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#include <asm/memory.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 <asm/alternative.h>
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#include "mm.h"
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phys_addr_t memstart_addr __read_mostly = 0;
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phys_addr_t arm64_dma_phys_limit __read_mostly;
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#ifdef CONFIG_BLK_DEV_INITRD
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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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initrd_start = (unsigned long)__va(start);
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initrd_end = (unsigned long)__va(start + 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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#endif
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/*
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* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
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* currently assumes that for memory starting above 4G, 32-bit devices will
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* use a DMA offset.
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*/
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static phys_addr_t max_zone_dma_phys(void)
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{
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phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
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return min(offset + (1ULL << 32), memblock_end_of_DRAM());
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}
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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_dma = min;
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memset(zone_size, 0, sizeof(zone_size));
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/* 4GB maximum for 32-bit only capable devices */
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if (IS_ENABLED(CONFIG_ZONE_DMA)) {
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max_dma = PFN_DOWN(arm64_dma_phys_limit);
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zone_size[ZONE_DMA] = max_dma - min;
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}
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zone_size[ZONE_NORMAL] = max - max_dma;
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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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if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
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unsigned long dma_end = min(end, max_dma);
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zhole_size[ZONE_DMA] -= dma_end - start;
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}
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if (end > max_dma) {
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unsigned long normal_end = min(end, max);
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unsigned long normal_start = max(start, max_dma);
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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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static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX;
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/*
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* Limit the memory size that was specified via FDT.
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*/
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static int __init early_mem(char *p)
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{
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if (!p)
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return 1;
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memory_limit = memparse(p, &p) & PAGE_MASK;
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pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
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return 0;
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}
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early_param("mem", early_mem);
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void __init arm64_memblock_init(void)
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{
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memblock_enforce_memory_limit(memory_limit);
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/*
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* Register the kernel text, kernel data, initrd, and initial
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* pagetables with memblock.
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*/
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memblock_reserve(__pa(_text), _end - _text);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start)
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memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
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#endif
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early_init_fdt_scan_reserved_mem();
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/* 4GB maximum for 32-bit only capable devices */
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if (IS_ENABLED(CONFIG_ZONE_DMA))
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arm64_dma_phys_limit = max_zone_dma_phys();
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else
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arm64_dma_phys_limit = PHYS_MASK + 1;
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dma_contiguous_reserve(arm64_dma_phys_limit);
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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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#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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swiotlb_init(1);
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set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
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#ifndef CONFIG_SPARSEMEM_VMEMMAP
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free_unused_memmap();
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#endif
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/* this will put all unused low memory onto the freelists */
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free_all_bootmem();
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mem_init_print_info(NULL);
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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 MLG(b, t) b, t, ((t) - (b)) >> 30
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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 GB)\n"
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n"
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" 0x%16lx - 0x%16lx (%6ld MB actual)\n"
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#endif
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" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n"
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" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n"
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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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MLG(VMALLOC_START, VMALLOC_END),
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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MLG((unsigned long)vmemmap,
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(unsigned long)vmemmap + VMEMMAP_SIZE),
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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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MLK(FIXADDR_START, FIXADDR_TOP),
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MLM(PCI_IO_START, PCI_IO_END),
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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 && get_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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fixup_init();
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free_initmem_default(0);
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free_alternatives_memory();
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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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free_reserved_area((void *)start, (void *)end, 0, "initrd");
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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);
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#endif
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