/* * Based on arch/arm/mm/init.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/kernel.h> #include <linux/export.h> #include <linux/errno.h> #include <linux/swap.h> #include <linux/init.h> #include <linux/bootmem.h> #include <linux/mman.h> #include <linux/nodemask.h> #include <linux/initrd.h> #include <linux/gfp.h> #include <linux/memblock.h> #include <linux/sort.h> #include <linux/of_fdt.h> #include <linux/dma-mapping.h> #include <linux/dma-contiguous.h> #include <linux/efi.h> #include <linux/swiotlb.h> #include <asm/fixmap.h> #include <asm/memory.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/sizes.h> #include <asm/tlb.h> #include <asm/alternative.h> #include "mm.h" phys_addr_t memstart_addr __read_mostly = 0; phys_addr_t arm64_dma_phys_limit __read_mostly; #ifdef CONFIG_BLK_DEV_INITRD static int __init early_initrd(char *p) { unsigned long start, size; char *endp; start = memparse(p, &endp); if (*endp == ',') { size = memparse(endp + 1, NULL); initrd_start = (unsigned long)__va(start); initrd_end = (unsigned long)__va(start + size); } return 0; } early_param("initrd", early_initrd); #endif /* * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It * currently assumes that for memory starting above 4G, 32-bit devices will * use a DMA offset. */ static phys_addr_t max_zone_dma_phys(void) { phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32); return min(offset + (1ULL << 32), memblock_end_of_DRAM()); } static void __init zone_sizes_init(unsigned long min, unsigned long max) { struct memblock_region *reg; unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; unsigned long max_dma = min; memset(zone_size, 0, sizeof(zone_size)); /* 4GB maximum for 32-bit only capable devices */ if (IS_ENABLED(CONFIG_ZONE_DMA)) { max_dma = PFN_DOWN(arm64_dma_phys_limit); zone_size[ZONE_DMA] = max_dma - min; } zone_size[ZONE_NORMAL] = max - max_dma; memcpy(zhole_size, zone_size, sizeof(zhole_size)); for_each_memblock(memory, reg) { unsigned long start = memblock_region_memory_base_pfn(reg); unsigned long end = memblock_region_memory_end_pfn(reg); if (start >= max) continue; if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { unsigned long dma_end = min(end, max_dma); zhole_size[ZONE_DMA] -= dma_end - start; } if (end > max_dma) { unsigned long normal_end = min(end, max); unsigned long normal_start = max(start, max_dma); zhole_size[ZONE_NORMAL] -= normal_end - normal_start; } } free_area_init_node(0, zone_size, min, zhole_size); } #ifdef CONFIG_HAVE_ARCH_PFN_VALID #define PFN_MASK ((1UL << (64 - PAGE_SHIFT)) - 1) int pfn_valid(unsigned long pfn) { return (pfn & PFN_MASK) == pfn && memblock_is_memory(pfn << PAGE_SHIFT); } EXPORT_SYMBOL(pfn_valid); #endif #ifndef CONFIG_SPARSEMEM static void arm64_memory_present(void) { } #else static void arm64_memory_present(void) { struct memblock_region *reg; for_each_memblock(memory, reg) memory_present(0, memblock_region_memory_base_pfn(reg), memblock_region_memory_end_pfn(reg)); } #endif static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX; /* * Limit the memory size that was specified via FDT. */ static int __init early_mem(char *p) { if (!p) return 1; memory_limit = memparse(p, &p) & PAGE_MASK; pr_notice("Memory limited to %lldMB\n", memory_limit >> 20); return 0; } early_param("mem", early_mem); void __init arm64_memblock_init(void) { memblock_enforce_memory_limit(memory_limit); /* * Register the kernel text, kernel data, initrd, and initial * pagetables with memblock. */ memblock_reserve(__pa(_text), _end - _text); #ifdef CONFIG_BLK_DEV_INITRD if (initrd_start) memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); #endif early_init_fdt_scan_reserved_mem(); /* 4GB maximum for 32-bit only capable devices */ if (IS_ENABLED(CONFIG_ZONE_DMA)) arm64_dma_phys_limit = max_zone_dma_phys(); else arm64_dma_phys_limit = PHYS_MASK + 1; dma_contiguous_reserve(arm64_dma_phys_limit); memblock_allow_resize(); memblock_dump_all(); } void __init bootmem_init(void) { unsigned long min, max; min = PFN_UP(memblock_start_of_DRAM()); max = PFN_DOWN(memblock_end_of_DRAM()); early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); /* * Sparsemem tries to allocate bootmem in memory_present(), so must be * done after the fixed reservations. */ arm64_memory_present(); sparse_init(); zone_sizes_init(min, max); high_memory = __va((max << PAGE_SHIFT) - 1) + 1; max_pfn = max_low_pfn = max; } #ifndef CONFIG_SPARSEMEM_VMEMMAP static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) { struct page *start_pg, *end_pg; unsigned long pg, pgend; /* * Convert start_pfn/end_pfn to a struct page pointer. */ start_pg = pfn_to_page(start_pfn - 1) + 1; end_pg = pfn_to_page(end_pfn - 1) + 1; /* * Convert to physical addresses, and round start upwards and end * downwards. */ pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; /* * If there are free pages between these, free the section of the * memmap array. */ if (pg < pgend) free_bootmem(pg, pgend - pg); } /* * The mem_map array can get very big. Free the unused area of the memory map. */ static void __init free_unused_memmap(void) { unsigned long start, prev_end = 0; struct memblock_region *reg; for_each_memblock(memory, reg) { start = __phys_to_pfn(reg->base); #ifdef CONFIG_SPARSEMEM /* * Take care not to free memmap entries that don't exist due * to SPARSEMEM sections which aren't present. */ start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); #endif /* * If we had a previous bank, and there is a space between the * current bank and the previous, free it. */ if (prev_end && prev_end < start) free_memmap(prev_end, start); /* * Align up here since the VM subsystem insists that the * memmap entries are valid from the bank end aligned to * MAX_ORDER_NR_PAGES. */ prev_end = ALIGN(start + __phys_to_pfn(reg->size), MAX_ORDER_NR_PAGES); } #ifdef CONFIG_SPARSEMEM if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); #endif } #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ /* * mem_init() marks the free areas in the mem_map and tells us how much memory * is free. This is done after various parts of the system have claimed their * memory after the kernel image. */ void __init mem_init(void) { swiotlb_init(1); set_max_mapnr(pfn_to_page(max_pfn) - mem_map); #ifndef CONFIG_SPARSEMEM_VMEMMAP free_unused_memmap(); #endif /* this will put all unused low memory onto the freelists */ free_all_bootmem(); mem_init_print_info(NULL); #define MLK(b, t) b, t, ((t) - (b)) >> 10 #define MLM(b, t) b, t, ((t) - (b)) >> 20 #define MLG(b, t) b, t, ((t) - (b)) >> 30 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) pr_notice("Virtual kernel memory layout:\n" " vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n" #ifdef CONFIG_SPARSEMEM_VMEMMAP " vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n" " 0x%16lx - 0x%16lx (%6ld MB actual)\n" #endif " fixed : 0x%16lx - 0x%16lx (%6ld KB)\n" " PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n" " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" " .init : 0x%p" " - 0x%p" " (%6ld KB)\n" " .text : 0x%p" " - 0x%p" " (%6ld KB)\n" " .data : 0x%p" " - 0x%p" " (%6ld KB)\n", MLG(VMALLOC_START, VMALLOC_END), #ifdef CONFIG_SPARSEMEM_VMEMMAP MLG((unsigned long)vmemmap, (unsigned long)vmemmap + VMEMMAP_SIZE), MLM((unsigned long)virt_to_page(PAGE_OFFSET), (unsigned long)virt_to_page(high_memory)), #endif MLK(FIXADDR_START, FIXADDR_TOP), MLM(PCI_IO_START, PCI_IO_END), MLM(MODULES_VADDR, MODULES_END), MLM(PAGE_OFFSET, (unsigned long)high_memory), MLK_ROUNDUP(__init_begin, __init_end), MLK_ROUNDUP(_text, _etext), MLK_ROUNDUP(_sdata, _edata)); #undef MLK #undef MLM #undef MLK_ROUNDUP /* * Check boundaries twice: Some fundamental inconsistencies can be * detected at build time already. */ #ifdef CONFIG_COMPAT BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); #endif BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); BUG_ON(TASK_SIZE_64 > MODULES_VADDR); if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { extern int sysctl_overcommit_memory; /* * On a machine this small we won't get anywhere without * overcommit, so turn it on by default. */ sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; } } void free_initmem(void) { fixup_init(); free_initmem_default(0); free_alternatives_memory(); } #ifdef CONFIG_BLK_DEV_INITRD static int keep_initrd; void free_initrd_mem(unsigned long start, unsigned long end) { if (!keep_initrd) free_reserved_area((void *)start, (void *)end, 0, "initrd"); } static int __init keepinitrd_setup(char *__unused) { keep_initrd = 1; return 1; } __setup("keepinitrd", keepinitrd_setup); #endif