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266 lines
7.2 KiB
266 lines
7.2 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle |
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
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*/ |
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#ifndef _ASM_PAGE_H |
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#define _ASM_PAGE_H |
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#include <spaces.h> |
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#include <linux/const.h> |
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#include <linux/kernel.h> |
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#include <asm/mipsregs.h> |
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/* |
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* PAGE_SHIFT determines the page size |
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*/ |
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#ifdef CONFIG_PAGE_SIZE_4KB |
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#define PAGE_SHIFT 12 |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_8KB |
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#define PAGE_SHIFT 13 |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_16KB |
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#define PAGE_SHIFT 14 |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_32KB |
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#define PAGE_SHIFT 15 |
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#endif |
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#ifdef CONFIG_PAGE_SIZE_64KB |
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#define PAGE_SHIFT 16 |
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#endif |
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#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) |
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#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) |
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/* |
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* This is used for calculating the real page sizes |
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* for FTLB or VTLB + FTLB configurations. |
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*/ |
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static inline unsigned int page_size_ftlb(unsigned int mmuextdef) |
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{ |
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switch (mmuextdef) { |
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case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: |
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if (PAGE_SIZE == (1 << 30)) |
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return 5; |
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if (PAGE_SIZE == (1llu << 32)) |
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return 6; |
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if (PAGE_SIZE > (256 << 10)) |
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return 7; /* reserved */ |
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fallthrough; |
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case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT: |
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return (PAGE_SHIFT - 10) / 2; |
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default: |
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panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n", |
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mmuextdef >> 14); |
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} |
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} |
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#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT |
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#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) |
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#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) |
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#define HPAGE_MASK (~(HPAGE_SIZE - 1)) |
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) |
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#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */ |
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#define HPAGE_SHIFT ({BUILD_BUG(); 0; }) |
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#define HPAGE_SIZE ({BUILD_BUG(); 0; }) |
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#define HPAGE_MASK ({BUILD_BUG(); 0; }) |
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#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; }) |
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#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ |
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#include <linux/pfn.h> |
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extern void build_clear_page(void); |
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extern void build_copy_page(void); |
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/* |
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* It's normally defined only for FLATMEM config but it's |
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* used in our early mem init code for all memory models. |
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* So always define it. |
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*/ |
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#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET |
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extern unsigned long ARCH_PFN_OFFSET; |
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# define ARCH_PFN_OFFSET ARCH_PFN_OFFSET |
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#else |
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# define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) |
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#endif |
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extern void clear_page(void * page); |
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extern void copy_page(void * to, void * from); |
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extern unsigned long shm_align_mask; |
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static inline unsigned long pages_do_alias(unsigned long addr1, |
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unsigned long addr2) |
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{ |
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return (addr1 ^ addr2) & shm_align_mask; |
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} |
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struct page; |
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static inline void clear_user_page(void *addr, unsigned long vaddr, |
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struct page *page) |
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{ |
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extern void (*flush_data_cache_page)(unsigned long addr); |
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clear_page(addr); |
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if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) |
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flush_data_cache_page((unsigned long)addr); |
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} |
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struct vm_area_struct; |
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extern void copy_user_highpage(struct page *to, struct page *from, |
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unsigned long vaddr, struct vm_area_struct *vma); |
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#define __HAVE_ARCH_COPY_USER_HIGHPAGE |
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/* |
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* These are used to make use of C type-checking.. |
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*/ |
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#ifdef CONFIG_PHYS_ADDR_T_64BIT |
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#ifdef CONFIG_CPU_MIPS32 |
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typedef struct { unsigned long pte_low, pte_high; } pte_t; |
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#define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) |
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#define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) |
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#else |
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typedef struct { unsigned long long pte; } pte_t; |
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#define pte_val(x) ((x).pte) |
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#define __pte(x) ((pte_t) { (x) } ) |
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#endif |
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#else |
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typedef struct { unsigned long pte; } pte_t; |
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#define pte_val(x) ((x).pte) |
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#define __pte(x) ((pte_t) { (x) } ) |
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#endif |
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typedef struct page *pgtable_t; |
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/* |
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* Right now we don't support 4-level pagetables, so all pud-related |
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* definitions come from <asm-generic/pgtable-nopud.h>. |
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*/ |
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/* |
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* Finall the top of the hierarchy, the pgd |
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*/ |
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typedef struct { unsigned long pgd; } pgd_t; |
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#define pgd_val(x) ((x).pgd) |
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#define __pgd(x) ((pgd_t) { (x) } ) |
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/* |
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* Manipulate page protection bits |
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*/ |
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typedef struct { unsigned long pgprot; } pgprot_t; |
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#define pgprot_val(x) ((x).pgprot) |
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#define __pgprot(x) ((pgprot_t) { (x) } ) |
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#define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK) |
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/* |
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* On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd |
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* pair of pages we only have a single global bit per pair of pages. When |
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* writing to the TLB make sure we always have the bit set for both pages |
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* or none. This macro is used to access the `buddy' of the pte we're just |
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* working on. |
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*/ |
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#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) |
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/* |
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* __pa()/__va() should be used only during mem init. |
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*/ |
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static inline unsigned long ___pa(unsigned long x) |
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{ |
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if (IS_ENABLED(CONFIG_64BIT)) { |
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/* |
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* For MIPS64 the virtual address may either be in one of |
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* the compatibility segements ckseg0 or ckseg1, or it may |
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* be in xkphys. |
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*/ |
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return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x); |
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} |
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if (!IS_ENABLED(CONFIG_EVA)) { |
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/* |
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* We're using the standard MIPS32 legacy memory map, ie. |
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* the address x is going to be in kseg0 or kseg1. We can |
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* handle either case by masking out the desired bits using |
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* CPHYSADDR. |
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*/ |
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return CPHYSADDR(x); |
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} |
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/* |
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* EVA is in use so the memory map could be anything, making it not |
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* safe to just mask out bits. |
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*/ |
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return x - PAGE_OFFSET + PHYS_OFFSET; |
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} |
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#define __pa(x) ___pa((unsigned long)(x)) |
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#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) |
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#include <asm/io.h> |
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/* |
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* RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad |
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* (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The |
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* discussion can be found in |
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* https://lore.kernel.org/lkml/[email protected] |
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* |
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* It is unclear if the misscompilations mentioned in |
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* https://lore.kernel.org/lkml/[email protected] |
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* also affect MIPS so we keep this one until GCC 3.x has been retired |
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* before we can apply https://patchwork.linux-mips.org/patch/1541/ |
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*/ |
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#ifndef __pa_symbol |
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#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
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#endif |
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
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#ifdef CONFIG_FLATMEM |
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static inline int pfn_valid(unsigned long pfn) |
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{ |
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/* avoid <linux/mm.h> include hell */ |
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extern unsigned long max_mapnr; |
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unsigned long pfn_offset = ARCH_PFN_OFFSET; |
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return pfn >= pfn_offset && pfn < max_mapnr; |
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} |
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#elif defined(CONFIG_SPARSEMEM) |
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/* pfn_valid is defined in linux/mmzone.h */ |
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#elif defined(CONFIG_NEED_MULTIPLE_NODES) |
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#define pfn_valid(pfn) \ |
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({ \ |
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unsigned long __pfn = (pfn); \ |
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int __n = pfn_to_nid(__pfn); \ |
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((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ |
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NODE_DATA(__n)->node_spanned_pages) \ |
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: 0); \ |
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}) |
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#endif |
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#define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr))) |
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#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) |
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extern bool __virt_addr_valid(const volatile void *kaddr); |
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#define virt_addr_valid(kaddr) \ |
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__virt_addr_valid((const volatile void *) (kaddr)) |
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#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC |
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extern unsigned long __kaslr_offset; |
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static inline unsigned long kaslr_offset(void) |
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{ |
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return __kaslr_offset; |
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} |
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#include <asm-generic/memory_model.h> |
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#include <asm-generic/getorder.h> |
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#endif /* _ASM_PAGE_H */
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