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469 lines
14 KiB
469 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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#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/cache.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.h> |
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#include <linux/of_fdt.h> |
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#include <linux/dma-direct.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/efi.h> |
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#include <linux/swiotlb.h> |
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#include <linux/vmalloc.h> |
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#include <linux/mm.h> |
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#include <linux/kexec.h> |
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#include <linux/crash_dump.h> |
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#include <linux/hugetlb.h> |
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#include <linux/acpi_iort.h> |
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#include <linux/kmemleak.h> |
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#include <asm/boot.h> |
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#include <asm/fixmap.h> |
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#include <asm/kasan.h> |
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#include <asm/kernel-pgtable.h> |
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#include <asm/kvm_host.h> |
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#include <asm/memory.h> |
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#include <asm/numa.h> |
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#include <asm/sections.h> |
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#include <asm/setup.h> |
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#include <linux/sizes.h> |
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#include <asm/tlb.h> |
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#include <asm/alternative.h> |
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#include <asm/xen/swiotlb-xen.h> |
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/* |
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* We need to be able to catch inadvertent references to memstart_addr |
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* that occur (potentially in generic code) before arm64_memblock_init() |
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* executes, which assigns it its actual value. So use a default value |
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* that cannot be mistaken for a real physical address. |
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*/ |
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s64 memstart_addr __ro_after_init = -1; |
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EXPORT_SYMBOL(memstart_addr); |
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/* |
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* If the corresponding config options are enabled, we create both ZONE_DMA |
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* and ZONE_DMA32. By default ZONE_DMA covers the 32-bit addressable memory |
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* unless restricted on specific platforms (e.g. 30-bit on Raspberry Pi 4). |
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* In such case, ZONE_DMA32 covers the rest of the 32-bit addressable memory, |
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* otherwise it is empty. |
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*/ |
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phys_addr_t arm64_dma_phys_limit __ro_after_init; |
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#ifdef CONFIG_KEXEC_CORE |
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/* |
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* reserve_crashkernel() - reserves memory for crash kernel |
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* |
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* This function reserves memory area given in "crashkernel=" kernel command |
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* line parameter. The memory reserved is used by dump capture kernel when |
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* primary kernel is crashing. |
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*/ |
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static void __init reserve_crashkernel(void) |
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{ |
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unsigned long long crash_base, crash_size; |
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unsigned long long crash_max = arm64_dma_phys_limit; |
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int ret; |
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ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
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&crash_size, &crash_base); |
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/* no crashkernel= or invalid value specified */ |
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if (ret || !crash_size) |
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return; |
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crash_size = PAGE_ALIGN(crash_size); |
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/* User specifies base address explicitly. */ |
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if (crash_base) |
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crash_max = crash_base + crash_size; |
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/* Current arm64 boot protocol requires 2MB alignment */ |
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crash_base = memblock_phys_alloc_range(crash_size, SZ_2M, |
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crash_base, crash_max); |
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if (!crash_base) { |
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pr_warn("cannot allocate crashkernel (size:0x%llx)\n", |
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crash_size); |
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return; |
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} |
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pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n", |
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crash_base, crash_base + crash_size, crash_size >> 20); |
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/* |
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* The crashkernel memory will be removed from the kernel linear |
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* map. Inform kmemleak so that it won't try to access it. |
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*/ |
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kmemleak_ignore_phys(crash_base); |
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crashk_res.start = crash_base; |
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crashk_res.end = crash_base + crash_size - 1; |
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} |
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#else |
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static void __init reserve_crashkernel(void) |
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{ |
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} |
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#endif /* CONFIG_KEXEC_CORE */ |
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/* |
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* Return the maximum physical address for a zone accessible by the given bits |
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* limit. If DRAM starts above 32-bit, expand the zone to the maximum |
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* available memory, otherwise cap it at 32-bit. |
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*/ |
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static phys_addr_t __init max_zone_phys(unsigned int zone_bits) |
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{ |
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phys_addr_t zone_mask = DMA_BIT_MASK(zone_bits); |
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phys_addr_t phys_start = memblock_start_of_DRAM(); |
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if (phys_start > U32_MAX) |
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zone_mask = PHYS_ADDR_MAX; |
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else if (phys_start > zone_mask) |
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zone_mask = U32_MAX; |
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return min(zone_mask, memblock_end_of_DRAM() - 1) + 1; |
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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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unsigned long max_zone_pfns[MAX_NR_ZONES] = {0}; |
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unsigned int __maybe_unused acpi_zone_dma_bits; |
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unsigned int __maybe_unused dt_zone_dma_bits; |
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phys_addr_t __maybe_unused dma32_phys_limit = max_zone_phys(32); |
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#ifdef CONFIG_ZONE_DMA |
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acpi_zone_dma_bits = fls64(acpi_iort_dma_get_max_cpu_address()); |
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dt_zone_dma_bits = fls64(of_dma_get_max_cpu_address(NULL)); |
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zone_dma_bits = min3(32U, dt_zone_dma_bits, acpi_zone_dma_bits); |
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arm64_dma_phys_limit = max_zone_phys(zone_dma_bits); |
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(arm64_dma_phys_limit); |
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#endif |
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#ifdef CONFIG_ZONE_DMA32 |
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max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); |
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if (!arm64_dma_phys_limit) |
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arm64_dma_phys_limit = dma32_phys_limit; |
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#endif |
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if (!arm64_dma_phys_limit) |
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arm64_dma_phys_limit = PHYS_MASK + 1; |
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max_zone_pfns[ZONE_NORMAL] = max; |
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free_area_init(max_zone_pfns); |
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} |
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int pfn_valid(unsigned long pfn) |
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{ |
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phys_addr_t addr = PFN_PHYS(pfn); |
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struct mem_section *ms; |
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/* |
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* Ensure the upper PAGE_SHIFT bits are clear in the |
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* pfn. Else it might lead to false positives when |
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* some of the upper bits are set, but the lower bits |
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* match a valid pfn. |
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*/ |
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if (PHYS_PFN(addr) != pfn) |
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return 0; |
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if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) |
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return 0; |
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ms = __pfn_to_section(pfn); |
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if (!valid_section(ms)) |
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return 0; |
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/* |
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* ZONE_DEVICE memory does not have the memblock entries. |
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* memblock_is_map_memory() check for ZONE_DEVICE based |
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* addresses will always fail. Even the normal hotplugged |
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* memory will never have MEMBLOCK_NOMAP flag set in their |
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* memblock entries. Skip memblock search for all non early |
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* memory sections covering all of hotplug memory including |
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* both normal and ZONE_DEVICE based. |
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*/ |
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if (!early_section(ms)) |
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return pfn_section_valid(ms, pfn); |
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return memblock_is_memory(addr); |
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} |
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EXPORT_SYMBOL(pfn_valid); |
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int pfn_is_map_memory(unsigned long pfn) |
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{ |
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phys_addr_t addr = PFN_PHYS(pfn); |
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/* avoid false positives for bogus PFNs, see comment in pfn_valid() */ |
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if (PHYS_PFN(addr) != pfn) |
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return 0; |
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return memblock_is_map_memory(addr); |
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} |
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EXPORT_SYMBOL(pfn_is_map_memory); |
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static phys_addr_t memory_limit = PHYS_ADDR_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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s64 linear_region_size = PAGE_END - _PAGE_OFFSET(vabits_actual); |
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/* |
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* Corner case: 52-bit VA capable systems running KVM in nVHE mode may |
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* be limited in their ability to support a linear map that exceeds 51 |
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* bits of VA space, depending on the placement of the ID map. Given |
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* that the placement of the ID map may be randomized, let's simply |
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* limit the kernel's linear map to 51 bits as well if we detect this |
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* configuration. |
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*/ |
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if (IS_ENABLED(CONFIG_KVM) && vabits_actual == 52 && |
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is_hyp_mode_available() && !is_kernel_in_hyp_mode()) { |
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pr_info("Capping linear region to 51 bits for KVM in nVHE mode on LVA capable hardware.\n"); |
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linear_region_size = min_t(u64, linear_region_size, BIT(51)); |
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} |
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/* Remove memory above our supported physical address size */ |
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memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX); |
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/* |
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* Select a suitable value for the base of physical memory. |
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*/ |
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memstart_addr = round_down(memblock_start_of_DRAM(), |
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ARM64_MEMSTART_ALIGN); |
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if ((memblock_end_of_DRAM() - memstart_addr) > linear_region_size) |
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pr_warn("Memory doesn't fit in the linear mapping, VA_BITS too small\n"); |
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/* |
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* Remove the memory that we will not be able to cover with the |
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* linear mapping. Take care not to clip the kernel which may be |
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* high in memory. |
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*/ |
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memblock_remove(max_t(u64, memstart_addr + linear_region_size, |
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__pa_symbol(_end)), ULLONG_MAX); |
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if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) { |
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/* ensure that memstart_addr remains sufficiently aligned */ |
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memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size, |
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ARM64_MEMSTART_ALIGN); |
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memblock_remove(0, memstart_addr); |
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} |
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/* |
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* If we are running with a 52-bit kernel VA config on a system that |
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* does not support it, we have to place the available physical |
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* memory in the 48-bit addressable part of the linear region, i.e., |
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* we have to move it upward. Since memstart_addr represents the |
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* physical address of PAGE_OFFSET, we have to *subtract* from it. |
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*/ |
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if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52) && (vabits_actual != 52)) |
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memstart_addr -= _PAGE_OFFSET(48) - _PAGE_OFFSET(52); |
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/* |
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* Apply the memory limit if it was set. Since the kernel may be loaded |
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* high up in memory, add back the kernel region that must be accessible |
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* via the linear mapping. |
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*/ |
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if (memory_limit != PHYS_ADDR_MAX) { |
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memblock_mem_limit_remove_map(memory_limit); |
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memblock_add(__pa_symbol(_text), (u64)(_end - _text)); |
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} |
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if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) { |
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/* |
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* Add back the memory we just removed if it results in the |
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* initrd to become inaccessible via the linear mapping. |
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* Otherwise, this is a no-op |
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*/ |
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u64 base = phys_initrd_start & PAGE_MASK; |
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u64 size = PAGE_ALIGN(phys_initrd_start + phys_initrd_size) - base; |
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/* |
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* We can only add back the initrd memory if we don't end up |
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* with more memory than we can address via the linear mapping. |
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* It is up to the bootloader to position the kernel and the |
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* initrd reasonably close to each other (i.e., within 32 GB of |
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* each other) so that all granule/#levels combinations can |
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* always access both. |
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*/ |
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if (WARN(base < memblock_start_of_DRAM() || |
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base + size > memblock_start_of_DRAM() + |
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linear_region_size, |
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"initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) { |
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phys_initrd_size = 0; |
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} else { |
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memblock_remove(base, size); /* clear MEMBLOCK_ flags */ |
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memblock_add(base, size); |
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memblock_reserve(base, size); |
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} |
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} |
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if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) { |
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extern u16 memstart_offset_seed; |
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u64 mmfr0 = read_cpuid(ID_AA64MMFR0_EL1); |
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int parange = cpuid_feature_extract_unsigned_field( |
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mmfr0, ID_AA64MMFR0_PARANGE_SHIFT); |
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s64 range = linear_region_size - |
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BIT(id_aa64mmfr0_parange_to_phys_shift(parange)); |
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/* |
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* If the size of the linear region exceeds, by a sufficient |
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* margin, the size of the region that the physical memory can |
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* span, randomize the linear region as well. |
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*/ |
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if (memstart_offset_seed > 0 && range >= (s64)ARM64_MEMSTART_ALIGN) { |
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range /= ARM64_MEMSTART_ALIGN; |
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memstart_addr -= ARM64_MEMSTART_ALIGN * |
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((range * memstart_offset_seed) >> 16); |
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} |
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} |
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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_symbol(_stext), _end - _stext); |
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if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) { |
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/* the generic initrd code expects 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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early_init_fdt_scan_reserved_mem(); |
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high_memory = __va(memblock_end_of_DRAM() - 1) + 1; |
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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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early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); |
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max_pfn = max_low_pfn = max; |
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min_low_pfn = min; |
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arch_numa_init(); |
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/* |
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* must be done after arch_numa_init() which calls numa_init() to |
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* initialize node_online_map that gets used in hugetlb_cma_reserve() |
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* while allocating required CMA size across online nodes. |
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*/ |
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#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA) |
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arm64_hugetlb_cma_reserve(); |
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#endif |
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dma_pernuma_cma_reserve(); |
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kvm_hyp_reserve(); |
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/* |
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* sparse_init() tries to allocate memory from memblock, so must be |
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* done after the fixed reservations |
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*/ |
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sparse_init(); |
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zone_sizes_init(min, max); |
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/* |
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* Reserve the CMA area after arm64_dma_phys_limit was initialised. |
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*/ |
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dma_contiguous_reserve(arm64_dma_phys_limit); |
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/* |
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* request_standard_resources() depends on crashkernel's memory being |
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* reserved, so do it here. |
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*/ |
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reserve_crashkernel(); |
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memblock_dump_all(); |
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} |
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/* |
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* mem_init() marks the free areas in the mem_map and tells us how much 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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if (swiotlb_force == SWIOTLB_FORCE || |
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max_pfn > PFN_DOWN(arm64_dma_phys_limit)) |
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swiotlb_init(1); |
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else if (!xen_swiotlb_detect()) |
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swiotlb_force = SWIOTLB_NO_FORCE; |
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set_max_mapnr(max_pfn - PHYS_PFN_OFFSET); |
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/* this will put all unused low memory onto the freelists */ |
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memblock_free_all(); |
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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 > DEFAULT_MAP_WINDOW_64); |
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#endif |
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/* |
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* Selected page table levels should match when derived from |
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* scratch using the virtual address range and page size. |
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*/ |
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BUILD_BUG_ON(ARM64_HW_PGTABLE_LEVELS(CONFIG_ARM64_VA_BITS) != |
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CONFIG_PGTABLE_LEVELS); |
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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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free_reserved_area(lm_alias(__init_begin), |
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lm_alias(__init_end), |
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POISON_FREE_INITMEM, "unused kernel"); |
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/* |
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* Unmap the __init region but leave the VM area in place. This |
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* prevents the region from being reused for kernel modules, which |
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* is not supported by kallsyms. |
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*/ |
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vunmap_range((u64)__init_begin, (u64)__init_end); |
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} |
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void dump_mem_limit(void) |
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{ |
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if (memory_limit != PHYS_ADDR_MAX) { |
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pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20); |
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} else { |
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pr_emerg("Memory Limit: none\n"); |
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} |
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}
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