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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208/* SPDX-License-Identifier: GPL-2.0-only *//* * Copyright 2006 PathScale, Inc. All Rights Reserved. */
#ifndef _LINUX_IO_H#define _LINUX_IO_H
#include <linux/sizes.h>#include <linux/types.h>#include <linux/init.h>#include <asm/io.h>#include <asm/page.h>
struct device;
#ifndef __iowrite32_copyvoid __iowrite32_copy(void __iomem *to, const void *from, size_t count);#endif
void __ioread32_copy(void *to, const void __iomem *from, size_t count);
#ifndef __iowrite64_copyvoid __iowrite64_copy(void __iomem *to, const void *from, size_t count);#endif
#ifdef CONFIG_MMUint ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot);int vmap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot);#elsestatic inline int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot){ return 0;}static inline int vmap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot){ return 0;}#endif
/* * Managed iomap interface */#ifdef CONFIG_HAS_IOPORT_MAPvoid __iomem * devm_ioport_map(struct device *dev, unsigned long port, unsigned int nr);void devm_ioport_unmap(struct device *dev, void __iomem *addr);#elsestatic inline void __iomem *devm_ioport_map(struct device *dev, unsigned long port, unsigned int nr){ return NULL;}
static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr){}#endif
void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, resource_size_t size);void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset, resource_size_t size);void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, resource_size_t size);void devm_iounmap(struct device *dev, void __iomem *addr);int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length);void devm_ioremap_release(struct device *dev, void *res);
void *devm_memremap(struct device *dev, resource_size_t offset, size_t size, unsigned long flags);void devm_memunmap(struct device *dev, void *addr);
/* architectures can override this */pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr, unsigned long size, pgprot_t prot);
#ifdef CONFIG_PCI/* * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and * Posting") mandate non-posted configuration transactions. This default * implementation attempts to use the ioremap_np() API to provide this * on arches that support it, and falls back to ioremap() on those that * don't. Overriding this function is deprecated; arches that properly * support non-posted accesses should implement ioremap_np() instead, which * this default implementation can then use to return mappings compliant with * the PCI specification. */#ifndef pci_remap_cfgspace#define pci_remap_cfgspace pci_remap_cfgspacestatic inline void __iomem *pci_remap_cfgspace(phys_addr_t offset, size_t size){ return ioremap_np(offset, size) ?: ioremap(offset, size);}#endif#endif
/* * Some systems do not have legacy ISA devices. * /dev/port is not a valid interface on these systems. * So for those archs, <asm/io.h> should define the following symbol. */#ifndef arch_has_dev_port#define arch_has_dev_port() (1)#endif
/* * Some systems (x86 without PAT) have a somewhat reliable way to mark a * physical address range such that uncached mappings will actually * end up write-combining. This facility should be used in conjunction * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has * no effect if the per-page mechanisms are functional. * (On x86 without PAT, these functions manipulate MTRRs.) * * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed * to have no effect. */#ifndef arch_phys_wc_addstatic inline int __must_check arch_phys_wc_add(unsigned long base, unsigned long size){ return 0; /* It worked (i.e. did nothing). */}
static inline void arch_phys_wc_del(int handle){}
#define arch_phys_wc_add arch_phys_wc_add#ifndef arch_phys_wc_indexstatic inline int arch_phys_wc_index(int handle){ return -1;}#define arch_phys_wc_index arch_phys_wc_index#endif#endif
int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size);
enum { /* See memremap() kernel-doc for usage description... */ MEMREMAP_WB = 1 << 0, MEMREMAP_WT = 1 << 1, MEMREMAP_WC = 1 << 2, MEMREMAP_ENC = 1 << 3, MEMREMAP_DEC = 1 << 4,};
void *memremap(resource_size_t offset, size_t size, unsigned long flags);void memunmap(void *addr);
/* * On x86 PAT systems we have memory tracking that keeps track of * the allowed mappings on memory ranges. This tracking works for * all the in-kernel mapping APIs (ioremap*), but where the user * wishes to map a range from a physical device into user memory * the tracking won't be updated. This API is to be used by * drivers which remap physical device pages into userspace, * and wants to make sure they are mapped WC and not UC. */#ifndef arch_io_reserve_memtype_wcstatic inline int arch_io_reserve_memtype_wc(resource_size_t base, resource_size_t size){ return 0;}
static inline void arch_io_free_memtype_wc(resource_size_t base, resource_size_t size){}#endif
int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start, resource_size_t size);
#ifdef CONFIG_STRICT_DEVMEMstatic inline int range_is_allowed(unsigned long pfn, unsigned long size){ u64 from = ((u64)pfn) << PAGE_SHIFT; u64 to = from + size; u64 cursor = from;
while (cursor < to) { if (!devmem_is_allowed(pfn)) return 0; cursor += PAGE_SIZE; pfn++; } return 1;}#elsestatic inline int range_is_allowed(unsigned long pfn, unsigned long size){ return 1;}#endif#endif /* _LINUX_IO_H */