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TOMOYO Linux Cross Reference
Linux/include/linux/io.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * Copyright 2006 PathScale, Inc.  All Rights Reserved.
  4  */
  5 
  6 #ifndef _LINUX_IO_H
  7 #define _LINUX_IO_H
  8 
  9 #include <linux/types.h>
 10 #include <linux/init.h>
 11 #include <linux/bug.h>
 12 #include <linux/err.h>
 13 #include <asm/io.h>
 14 #include <asm/page.h>
 15 
 16 struct device;
 17 struct resource;
 18 
 19 __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
 20 void __ioread32_copy(void *to, const void __iomem *from, size_t count);
 21 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
 22 
 23 #ifdef CONFIG_MMU
 24 int ioremap_page_range(unsigned long addr, unsigned long end,
 25                        phys_addr_t phys_addr, pgprot_t prot);
 26 #else
 27 static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 28                                      phys_addr_t phys_addr, pgprot_t prot)
 29 {
 30         return 0;
 31 }
 32 #endif
 33 
 34 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
 35 void __init ioremap_huge_init(void);
 36 int arch_ioremap_p4d_supported(void);
 37 int arch_ioremap_pud_supported(void);
 38 int arch_ioremap_pmd_supported(void);
 39 #else
 40 static inline void ioremap_huge_init(void) { }
 41 #endif
 42 
 43 /*
 44  * Managed iomap interface
 45  */
 46 #ifdef CONFIG_HAS_IOPORT_MAP
 47 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 48                                unsigned int nr);
 49 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
 50 #else
 51 static inline void __iomem *devm_ioport_map(struct device *dev,
 52                                              unsigned long port,
 53                                              unsigned int nr)
 54 {
 55         return NULL;
 56 }
 57 
 58 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 59 {
 60 }
 61 #endif
 62 
 63 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
 64 
 65 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 66                            resource_size_t size);
 67 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 68                                    resource_size_t size);
 69 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
 70                                    resource_size_t size);
 71 void devm_iounmap(struct device *dev, void __iomem *addr);
 72 int check_signature(const volatile void __iomem *io_addr,
 73                         const unsigned char *signature, int length);
 74 void devm_ioremap_release(struct device *dev, void *res);
 75 
 76 void *devm_memremap(struct device *dev, resource_size_t offset,
 77                 size_t size, unsigned long flags);
 78 void devm_memunmap(struct device *dev, void *addr);
 79 
 80 void *__devm_memremap_pages(struct device *dev, struct resource *res);
 81 
 82 #ifdef CONFIG_PCI
 83 /*
 84  * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
 85  * Posting") mandate non-posted configuration transactions. There is
 86  * no ioremap API in the kernel that can guarantee non-posted write
 87  * semantics across arches so provide a default implementation for
 88  * mapping PCI config space that defaults to ioremap_nocache(); arches
 89  * should override it if they have memory mapping implementations that
 90  * guarantee non-posted writes semantics to make the memory mapping
 91  * compliant with the PCI specification.
 92  */
 93 #ifndef pci_remap_cfgspace
 94 #define pci_remap_cfgspace pci_remap_cfgspace
 95 static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
 96                                                size_t size)
 97 {
 98         return ioremap_nocache(offset, size);
 99 }
100 #endif
101 #endif
102 
103 /*
104  * Some systems do not have legacy ISA devices.
105  * /dev/port is not a valid interface on these systems.
106  * So for those archs, <asm/io.h> should define the following symbol.
107  */
108 #ifndef arch_has_dev_port
109 #define arch_has_dev_port()     (1)
110 #endif
111 
112 /*
113  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
114  * physical address range such that uncached mappings will actually
115  * end up write-combining.  This facility should be used in conjunction
116  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
117  * no effect if the per-page mechanisms are functional.
118  * (On x86 without PAT, these functions manipulate MTRRs.)
119  *
120  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
121  * to have no effect.
122  */
123 #ifndef arch_phys_wc_add
124 static inline int __must_check arch_phys_wc_add(unsigned long base,
125                                                 unsigned long size)
126 {
127         return 0;  /* It worked (i.e. did nothing). */
128 }
129 
130 static inline void arch_phys_wc_del(int handle)
131 {
132 }
133 
134 #define arch_phys_wc_add arch_phys_wc_add
135 #ifndef arch_phys_wc_index
136 static inline int arch_phys_wc_index(int handle)
137 {
138         return -1;
139 }
140 #define arch_phys_wc_index arch_phys_wc_index
141 #endif
142 #endif
143 
144 enum {
145         /* See memremap() kernel-doc for usage description... */
146         MEMREMAP_WB = 1 << 0,
147         MEMREMAP_WT = 1 << 1,
148         MEMREMAP_WC = 1 << 2,
149         MEMREMAP_ENC = 1 << 3,
150         MEMREMAP_DEC = 1 << 4,
151 };
152 
153 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
154 void memunmap(void *addr);
155 
156 /*
157  * On x86 PAT systems we have memory tracking that keeps track of
158  * the allowed mappings on memory ranges. This tracking works for
159  * all the in-kernel mapping APIs (ioremap*), but where the user
160  * wishes to map a range from a physical device into user memory
161  * the tracking won't be updated. This API is to be used by
162  * drivers which remap physical device pages into userspace,
163  * and wants to make sure they are mapped WC and not UC.
164  */
165 #ifndef arch_io_reserve_memtype_wc
166 static inline int arch_io_reserve_memtype_wc(resource_size_t base,
167                                              resource_size_t size)
168 {
169         return 0;
170 }
171 
172 static inline void arch_io_free_memtype_wc(resource_size_t base,
173                                            resource_size_t size)
174 {
175 }
176 #endif
177 
178 #endif /* _LINUX_IO_H */
179 

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