157 строки
4.6 KiB
C
157 строки
4.6 KiB
C
/*
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* Based on arch/arm/include/asm/memory.h
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*
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* Copyright (C) 2000-2002 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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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __ASM_MEMORY_H
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#define __ASM_MEMORY_H
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#include <linux/compiler.h>
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#include <linux/const.h>
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#include <linux/types.h>
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#include <asm/sizes.h>
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/*
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* Allow for constants defined here to be used from assembly code
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* by prepending the UL suffix only with actual C code compilation.
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*/
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#define UL(x) _AC(x, UL)
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/*
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* PAGE_OFFSET - the virtual address of the start of the kernel image (top
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* (VA_BITS - 1))
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* VA_BITS - the maximum number of bits for virtual addresses.
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* TASK_SIZE - the maximum size of a user space task.
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* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 128MB of the kernel text.
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*/
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#ifdef CONFIG_ARM64_64K_PAGES
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#define VA_BITS (42)
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#else
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#define VA_BITS (39)
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#endif
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#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1))
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#define MODULES_END (PAGE_OFFSET)
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#define MODULES_VADDR (MODULES_END - SZ_64M)
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#define FIXADDR_TOP (MODULES_VADDR - SZ_2M - PAGE_SIZE)
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#define TASK_SIZE_64 (UL(1) << VA_BITS)
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#ifdef CONFIG_COMPAT
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#define TASK_SIZE_32 UL(0x100000000)
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#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
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TASK_SIZE_32 : TASK_SIZE_64)
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#else
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#define TASK_SIZE TASK_SIZE_64
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#endif /* CONFIG_COMPAT */
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#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
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#if TASK_SIZE_64 > MODULES_VADDR
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#error Top of 64-bit user space clashes with start of module space
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#endif
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/*
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* Physical vs virtual RAM address space conversion. These are
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* private definitions which should NOT be used outside memory.h
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* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
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*/
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#define __virt_to_phys(x) (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
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#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
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/*
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* Convert a physical address to a Page Frame Number and back
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*/
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#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
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#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
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/*
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* Convert a page to/from a physical address
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*/
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#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
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#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
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/*
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* Memory types available.
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*/
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#define MT_DEVICE_nGnRnE 0
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#define MT_DEVICE_nGnRE 1
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#define MT_DEVICE_GRE 2
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#define MT_NORMAL_NC 3
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#define MT_NORMAL 4
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/*
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* Memory types for Stage-2 translation
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*/
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#define MT_S2_NORMAL 0xf
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#define MT_S2_DEVICE_nGnRE 0x1
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#ifndef __ASSEMBLY__
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extern phys_addr_t memstart_addr;
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/* PHYS_OFFSET - the physical address of the start of memory. */
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#define PHYS_OFFSET ({ memstart_addr; })
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/*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*
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* This is the PFN of the first RAM page in the kernel
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* direct-mapped view. We assume this is the first page
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* of RAM in the mem_map as well.
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*/
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
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/*
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* Note: Drivers should NOT use these. They are the wrong
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* translation for translating DMA addresses. Use the driver
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* DMA support - see dma-mapping.h.
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*/
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static inline phys_addr_t virt_to_phys(const volatile void *x)
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{
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return __virt_to_phys((unsigned long)(x));
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}
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static inline void *phys_to_virt(phys_addr_t x)
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{
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return (void *)(__phys_to_virt(x));
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}
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/*
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* Drivers should NOT use these either.
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*/
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#define __pa(x) __virt_to_phys((unsigned long)(x))
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#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x))
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/*
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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* virt_addr_valid(k) indicates whether a virtual address is valid
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*/
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#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#endif
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#include <asm-generic/memory_model.h>
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#endif
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