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05/09/2024 07:14:12 AM
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Kbuild
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irq.h
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kvm_asm.h
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kvm_emulate.h
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kvm_host.h
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memory.h
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mmu.h
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mmu_context.h
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neon.h
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pci.h
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percpu.h
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perf_event.h
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pgalloc.h
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pgtable-hwdef.h
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pgtable-prot.h
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pgtable-types.h
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pgtable.h
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probes.h
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proc-fns.h
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processor.h
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ptdump.h
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ptrace.h
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sections.h
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shmparam.h
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signal32.h
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smp.h
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smp_plat.h
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sparsemem.h
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spinlock.h
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spinlock_types.h
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stack_pointer.h
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stackprotector.h
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stacktrace.h
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stage2_pgtable-nopmd.h
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stage2_pgtable-nopud.h
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stage2_pgtable.h
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string.h
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suspend.h
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tlb.h
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tlbflush.h
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topology.h
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traps.h
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vmap_stack.h
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xen
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05/09/2024 07:14:16 AM
rwxr-xr-x
Editing: kernel-pgtable.h
Close
/* * Kernel page table mapping * * Copyright (C) 2015 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/>. */ #ifndef __ASM_KERNEL_PGTABLE_H #define __ASM_KERNEL_PGTABLE_H #include <asm/pgtable.h> #include <asm/sparsemem.h> /* * The linear mapping and the start of memory are both 2M aligned (per * the arm64 booting.txt requirements). Hence we can use section mapping * with 4K (section size = 2M) but not with 16K (section size = 32M) or * 64K (section size = 512M). */ #ifdef CONFIG_ARM64_4K_PAGES #define ARM64_SWAPPER_USES_SECTION_MAPS 1 #else #define ARM64_SWAPPER_USES_SECTION_MAPS 0 #endif /* * The idmap and swapper page tables need some space reserved in the kernel * image. Both require pgd, pud (4 levels only) and pmd tables to (section) * map the kernel. With the 64K page configuration, swapper and idmap need to * map to pte level. The swapper also maps the FDT (see __create_page_tables * for more information). Note that the number of ID map translation levels * could be increased on the fly if system RAM is out of reach for the default * VA range, so pages required to map highest possible PA are reserved in all * cases. */ #if ARM64_SWAPPER_USES_SECTION_MAPS #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1) #define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT) - 1) #else #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS) #define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT)) #endif #define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE) #define IDMAP_DIR_SIZE (IDMAP_PGTABLE_LEVELS * PAGE_SIZE) #ifdef CONFIG_ARM64_SW_TTBR0_PAN #define RESERVED_TTBR0_SIZE (PAGE_SIZE) #else #define RESERVED_TTBR0_SIZE (0) #endif /* Initial memory map size */ #if ARM64_SWAPPER_USES_SECTION_MAPS #define SWAPPER_BLOCK_SHIFT SECTION_SHIFT #define SWAPPER_BLOCK_SIZE SECTION_SIZE #define SWAPPER_TABLE_SHIFT PUD_SHIFT #else #define SWAPPER_BLOCK_SHIFT PAGE_SHIFT #define SWAPPER_BLOCK_SIZE PAGE_SIZE #define SWAPPER_TABLE_SHIFT PMD_SHIFT #endif /* The size of the initial kernel direct mapping */ #define SWAPPER_INIT_MAP_SIZE (_AC(1, UL) << SWAPPER_TABLE_SHIFT) /* * Initial memory map attributes. */ #define SWAPPER_PTE_FLAGS (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED) #define SWAPPER_PMD_FLAGS (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S) #if ARM64_SWAPPER_USES_SECTION_MAPS #define SWAPPER_MM_MMUFLAGS (PMD_ATTRINDX(MT_NORMAL) | SWAPPER_PMD_FLAGS) #else #define SWAPPER_MM_MMUFLAGS (PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS) #endif /* * To make optimal use of block mappings when laying out the linear * mapping, round down the base of physical memory to a size that can * be mapped efficiently, i.e., either PUD_SIZE (4k granule) or PMD_SIZE * (64k granule), or a multiple that can be mapped using contiguous bits * in the page tables: 32 * PMD_SIZE (16k granule) */ #if defined(CONFIG_ARM64_4K_PAGES) #define ARM64_MEMSTART_SHIFT PUD_SHIFT #elif defined(CONFIG_ARM64_16K_PAGES) #define ARM64_MEMSTART_SHIFT (PMD_SHIFT + 5) #else #define ARM64_MEMSTART_SHIFT PMD_SHIFT #endif /* * sparsemem vmemmap imposes an additional requirement on the alignment of * memstart_addr, due to the fact that the base of the vmemmap region * has a direct correspondence, and needs to appear sufficiently aligned * in the virtual address space. */ #if defined(CONFIG_SPARSEMEM_VMEMMAP) && ARM64_MEMSTART_SHIFT < SECTION_SIZE_BITS #define ARM64_MEMSTART_ALIGN (1UL << SECTION_SIZE_BITS) #else #define ARM64_MEMSTART_ALIGN (1UL << ARM64_MEMSTART_SHIFT) #endif #endif /* __ASM_KERNEL_PGTABLE_H */