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427 lines
12 KiB
427 lines
12 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_IO_H |
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#define _ASM_X86_IO_H |
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/* |
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* This file contains the definitions for the x86 IO instructions |
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* inb/inw/inl/outb/outw/outl and the "string versions" of the same |
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* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" |
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* versions of the single-IO instructions (inb_p/inw_p/..). |
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* |
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* This file is not meant to be obfuscating: it's just complicated |
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* to (a) handle it all in a way that makes gcc able to optimize it |
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* as well as possible and (b) trying to avoid writing the same thing |
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* over and over again with slight variations and possibly making a |
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* mistake somewhere. |
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*/ |
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/* |
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* Thanks to James van Artsdalen for a better timing-fix than |
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* the two short jumps: using outb's to a nonexistent port seems |
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* to guarantee better timings even on fast machines. |
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* |
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* On the other hand, I'd like to be sure of a non-existent port: |
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* I feel a bit unsafe about using 0x80 (should be safe, though) |
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* |
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* Linus |
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*/ |
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/* |
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* Bit simplified and optimized by Jan Hubicka |
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999. |
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* |
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* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added, |
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* isa_read[wl] and isa_write[wl] fixed |
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* - Arnaldo Carvalho de Melo <[email protected]> |
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*/ |
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#define ARCH_HAS_IOREMAP_WC |
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#define ARCH_HAS_IOREMAP_WT |
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#include <linux/string.h> |
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#include <linux/compiler.h> |
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#include <asm/page.h> |
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#include <asm/early_ioremap.h> |
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#include <asm/pgtable_types.h> |
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#define build_mmio_read(name, size, type, reg, barrier) \ |
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static inline type name(const volatile void __iomem *addr) \ |
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{ type ret; asm volatile("mov" size " %1,%0":reg (ret) \ |
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:"m" (*(volatile type __force *)addr) barrier); return ret; } |
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#define build_mmio_write(name, size, type, reg, barrier) \ |
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static inline void name(type val, volatile void __iomem *addr) \ |
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{ asm volatile("mov" size " %0,%1": :reg (val), \ |
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"m" (*(volatile type __force *)addr) barrier); } |
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build_mmio_read(readb, "b", unsigned char, "=q", :"memory") |
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build_mmio_read(readw, "w", unsigned short, "=r", :"memory") |
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build_mmio_read(readl, "l", unsigned int, "=r", :"memory") |
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build_mmio_read(__readb, "b", unsigned char, "=q", ) |
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build_mmio_read(__readw, "w", unsigned short, "=r", ) |
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build_mmio_read(__readl, "l", unsigned int, "=r", ) |
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build_mmio_write(writeb, "b", unsigned char, "q", :"memory") |
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build_mmio_write(writew, "w", unsigned short, "r", :"memory") |
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build_mmio_write(writel, "l", unsigned int, "r", :"memory") |
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build_mmio_write(__writeb, "b", unsigned char, "q", ) |
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build_mmio_write(__writew, "w", unsigned short, "r", ) |
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build_mmio_write(__writel, "l", unsigned int, "r", ) |
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#define readb readb |
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#define readw readw |
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#define readl readl |
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#define readb_relaxed(a) __readb(a) |
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#define readw_relaxed(a) __readw(a) |
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#define readl_relaxed(a) __readl(a) |
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#define __raw_readb __readb |
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#define __raw_readw __readw |
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#define __raw_readl __readl |
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#define writeb writeb |
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#define writew writew |
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#define writel writel |
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#define writeb_relaxed(v, a) __writeb(v, a) |
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#define writew_relaxed(v, a) __writew(v, a) |
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#define writel_relaxed(v, a) __writel(v, a) |
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#define __raw_writeb __writeb |
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#define __raw_writew __writew |
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#define __raw_writel __writel |
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#ifdef CONFIG_X86_64 |
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build_mmio_read(readq, "q", u64, "=r", :"memory") |
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build_mmio_read(__readq, "q", u64, "=r", ) |
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build_mmio_write(writeq, "q", u64, "r", :"memory") |
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build_mmio_write(__writeq, "q", u64, "r", ) |
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#define readq_relaxed(a) __readq(a) |
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#define writeq_relaxed(v, a) __writeq(v, a) |
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#define __raw_readq __readq |
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#define __raw_writeq __writeq |
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/* Let people know that we have them */ |
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#define readq readq |
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#define writeq writeq |
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#endif |
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#define ARCH_HAS_VALID_PHYS_ADDR_RANGE |
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extern int valid_phys_addr_range(phys_addr_t addr, size_t size); |
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extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); |
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/** |
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* virt_to_phys - map virtual addresses to physical |
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* @address: address to remap |
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* |
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* The returned physical address is the physical (CPU) mapping for |
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* the memory address given. It is only valid to use this function on |
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* addresses directly mapped or allocated via kmalloc. |
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* |
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* This function does not give bus mappings for DMA transfers. In |
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* almost all conceivable cases a device driver should not be using |
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* this function |
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*/ |
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static inline phys_addr_t virt_to_phys(volatile void *address) |
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{ |
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return __pa(address); |
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} |
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#define virt_to_phys virt_to_phys |
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/** |
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* phys_to_virt - map physical address to virtual |
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* @address: address to remap |
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* |
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* The returned virtual address is a current CPU mapping for |
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* the memory address given. It is only valid to use this function on |
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* addresses that have a kernel mapping |
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* |
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* This function does not handle bus mappings for DMA transfers. In |
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* almost all conceivable cases a device driver should not be using |
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* this function |
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*/ |
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static inline void *phys_to_virt(phys_addr_t address) |
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{ |
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return __va(address); |
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} |
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#define phys_to_virt phys_to_virt |
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/* |
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* Change "struct page" to physical address. |
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*/ |
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#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) |
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/* |
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* ISA I/O bus memory addresses are 1:1 with the physical address. |
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* However, we truncate the address to unsigned int to avoid undesirable |
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* promitions in legacy drivers. |
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*/ |
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static inline unsigned int isa_virt_to_bus(volatile void *address) |
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{ |
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return (unsigned int)virt_to_phys(address); |
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} |
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#define isa_bus_to_virt phys_to_virt |
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/* |
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* However PCI ones are not necessarily 1:1 and therefore these interfaces |
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* are forbidden in portable PCI drivers. |
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* |
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* Allow them on x86 for legacy drivers, though. |
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*/ |
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#define virt_to_bus virt_to_phys |
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#define bus_to_virt phys_to_virt |
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/* |
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* The default ioremap() behavior is non-cached; if you need something |
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* else, you probably want one of the following. |
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*/ |
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extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size); |
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#define ioremap_uc ioremap_uc |
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extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size); |
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#define ioremap_cache ioremap_cache |
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extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val); |
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#define ioremap_prot ioremap_prot |
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extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size); |
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#define ioremap_encrypted ioremap_encrypted |
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/** |
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* ioremap - map bus memory into CPU space |
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* @offset: bus address of the memory |
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* @size: size of the resource to map |
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* |
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* ioremap performs a platform specific sequence of operations to |
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* make bus memory CPU accessible via the readb/readw/readl/writeb/ |
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* writew/writel functions and the other mmio helpers. The returned |
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* address is not guaranteed to be usable directly as a virtual |
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* address. |
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* |
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* If the area you are trying to map is a PCI BAR you should have a |
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* look at pci_iomap(). |
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*/ |
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void __iomem *ioremap(resource_size_t offset, unsigned long size); |
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#define ioremap ioremap |
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extern void iounmap(volatile void __iomem *addr); |
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#define iounmap iounmap |
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extern void set_iounmap_nonlazy(void); |
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#ifdef __KERNEL__ |
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void memcpy_fromio(void *, const volatile void __iomem *, size_t); |
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void memcpy_toio(volatile void __iomem *, const void *, size_t); |
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void memset_io(volatile void __iomem *, int, size_t); |
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#define memcpy_fromio memcpy_fromio |
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#define memcpy_toio memcpy_toio |
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#define memset_io memset_io |
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#include <asm-generic/iomap.h> |
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/* |
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* ISA space is 'always mapped' on a typical x86 system, no need to |
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* explicitly ioremap() it. The fact that the ISA IO space is mapped |
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* to PAGE_OFFSET is pure coincidence - it does not mean ISA values |
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* are physical addresses. The following constant pointer can be |
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* used as the IO-area pointer (it can be iounmapped as well, so the |
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* analogy with PCI is quite large): |
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*/ |
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#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) |
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#endif /* __KERNEL__ */ |
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extern void native_io_delay(void); |
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extern int io_delay_type; |
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extern void io_delay_init(void); |
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#if defined(CONFIG_PARAVIRT) |
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#include <asm/paravirt.h> |
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#else |
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static inline void slow_down_io(void) |
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{ |
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native_io_delay(); |
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#ifdef REALLY_SLOW_IO |
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native_io_delay(); |
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native_io_delay(); |
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native_io_delay(); |
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#endif |
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} |
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#endif |
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#ifdef CONFIG_AMD_MEM_ENCRYPT |
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#include <linux/jump_label.h> |
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extern struct static_key_false sev_enable_key; |
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static inline bool sev_key_active(void) |
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{ |
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return static_branch_unlikely(&sev_enable_key); |
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} |
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#else /* !CONFIG_AMD_MEM_ENCRYPT */ |
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static inline bool sev_key_active(void) { return false; } |
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#endif /* CONFIG_AMD_MEM_ENCRYPT */ |
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#define BUILDIO(bwl, bw, type) \ |
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static inline void out##bwl(unsigned type value, int port) \ |
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{ \ |
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asm volatile("out" #bwl " %" #bw "0, %w1" \ |
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: : "a"(value), "Nd"(port)); \ |
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} \ |
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\ |
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static inline unsigned type in##bwl(int port) \ |
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{ \ |
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unsigned type value; \ |
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asm volatile("in" #bwl " %w1, %" #bw "0" \ |
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: "=a"(value) : "Nd"(port)); \ |
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return value; \ |
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} \ |
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\ |
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static inline void out##bwl##_p(unsigned type value, int port) \ |
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{ \ |
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out##bwl(value, port); \ |
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slow_down_io(); \ |
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} \ |
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\ |
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static inline unsigned type in##bwl##_p(int port) \ |
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{ \ |
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unsigned type value = in##bwl(port); \ |
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slow_down_io(); \ |
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return value; \ |
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} \ |
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\ |
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static inline void outs##bwl(int port, const void *addr, unsigned long count) \ |
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{ \ |
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if (sev_key_active()) { \ |
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unsigned type *value = (unsigned type *)addr; \ |
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while (count) { \ |
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out##bwl(*value, port); \ |
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value++; \ |
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count--; \ |
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} \ |
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} else { \ |
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asm volatile("rep; outs" #bwl \ |
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: "+S"(addr), "+c"(count) \ |
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: "d"(port) : "memory"); \ |
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} \ |
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} \ |
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\ |
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static inline void ins##bwl(int port, void *addr, unsigned long count) \ |
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{ \ |
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if (sev_key_active()) { \ |
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unsigned type *value = (unsigned type *)addr; \ |
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while (count) { \ |
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*value = in##bwl(port); \ |
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value++; \ |
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count--; \ |
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} \ |
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} else { \ |
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asm volatile("rep; ins" #bwl \ |
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: "+D"(addr), "+c"(count) \ |
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: "d"(port) : "memory"); \ |
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} \ |
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} |
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BUILDIO(b, b, char) |
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BUILDIO(w, w, short) |
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BUILDIO(l, , int) |
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#define inb inb |
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#define inw inw |
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#define inl inl |
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#define inb_p inb_p |
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#define inw_p inw_p |
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#define inl_p inl_p |
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#define insb insb |
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#define insw insw |
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#define insl insl |
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#define outb outb |
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#define outw outw |
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#define outl outl |
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#define outb_p outb_p |
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#define outw_p outw_p |
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#define outl_p outl_p |
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#define outsb outsb |
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#define outsw outsw |
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#define outsl outsl |
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extern void *xlate_dev_mem_ptr(phys_addr_t phys); |
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extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr); |
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#define xlate_dev_mem_ptr xlate_dev_mem_ptr |
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#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr |
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extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
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enum page_cache_mode pcm); |
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extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); |
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#define ioremap_wc ioremap_wc |
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extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size); |
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#define ioremap_wt ioremap_wt |
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extern bool is_early_ioremap_ptep(pte_t *ptep); |
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#define IO_SPACE_LIMIT 0xffff |
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#include <asm-generic/io.h> |
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#undef PCI_IOBASE |
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#ifdef CONFIG_MTRR |
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extern int __must_check arch_phys_wc_index(int handle); |
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#define arch_phys_wc_index arch_phys_wc_index |
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extern int __must_check arch_phys_wc_add(unsigned long base, |
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unsigned long size); |
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extern void arch_phys_wc_del(int handle); |
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#define arch_phys_wc_add arch_phys_wc_add |
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#endif |
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#ifdef CONFIG_X86_PAT |
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extern int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size); |
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extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size); |
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#define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc |
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#endif |
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extern bool arch_memremap_can_ram_remap(resource_size_t offset, |
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unsigned long size, |
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unsigned long flags); |
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#define arch_memremap_can_ram_remap arch_memremap_can_ram_remap |
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extern bool phys_mem_access_encrypted(unsigned long phys_addr, |
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unsigned long size); |
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/** |
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* iosubmit_cmds512 - copy data to single MMIO location, in 512-bit units |
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* @dst: destination, in MMIO space (must be 512-bit aligned) |
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* @src: source |
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* @count: number of 512 bits quantities to submit |
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* |
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* Submit data from kernel space to MMIO space, in units of 512 bits at a |
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* time. Order of access is not guaranteed, nor is a memory barrier |
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* performed afterwards. |
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* |
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* Warning: Do not use this helper unless your driver has checked that the CPU |
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* instruction is supported on the platform. |
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*/ |
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static inline void iosubmit_cmds512(void __iomem *dst, const void *src, |
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size_t count) |
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{ |
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const u8 *from = src; |
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const u8 *end = from + count * 64; |
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while (from < end) { |
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movdir64b(dst, from); |
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from += 64; |
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} |
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} |
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#endif /* _ASM_X86_IO_H */
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