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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_uc(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 #ifdef CONFIG_PCI
 81 /*
 82  * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
 83  * Posting") mandate non-posted configuration transactions. There is
 84  * no ioremap API in the kernel that can guarantee non-posted write
 85  * semantics across arches so provide a default implementation for
 86  * mapping PCI config space that defaults to ioremap(); arches
 87  * should override it if they have memory mapping implementations that
 88  * guarantee non-posted writes semantics to make the memory mapping
 89  * compliant with the PCI specification.
 90  */
 91 #ifndef pci_remap_cfgspace
 92 #define pci_remap_cfgspace pci_remap_cfgspace
 93 static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
 94                                                size_t size)
 95 {
 96         return ioremap(offset, size);
 97 }
 98 #endif
 99 #endif
100 
101 /*
102  * Some systems do not have legacy ISA devices.
103  * /dev/port is not a valid interface on these systems.
104  * So for those archs, <asm/io.h> should define the following symbol.
105  */
106 #ifndef arch_has_dev_port
107 #define arch_has_dev_port()     (1)
108 #endif
109 
110 /*
111  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
112  * physical address range such that uncached mappings will actually
113  * end up write-combining.  This facility should be used in conjunction
114  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
115  * no effect if the per-page mechanisms are functional.
116  * (On x86 without PAT, these functions manipulate MTRRs.)
117  *
118  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
119  * to have no effect.
120  */
121 #ifndef arch_phys_wc_add
122 static inline int __must_check arch_phys_wc_add(unsigned long base,
123                                                 unsigned long size)
124 {
125         return 0;  /* It worked (i.e. did nothing). */
126 }
127 
128 static inline void arch_phys_wc_del(int handle)
129 {
130 }
131 
132 #define arch_phys_wc_add arch_phys_wc_add
133 #ifndef arch_phys_wc_index
134 static inline int arch_phys_wc_index(int handle)
135 {
136         return -1;
137 }
138 #define arch_phys_wc_index arch_phys_wc_index
139 #endif
140 #endif
141 
142 enum {
143         /* See memremap() kernel-doc for usage description... */
144         MEMREMAP_WB = 1 << 0,
145         MEMREMAP_WT = 1 << 1,
146         MEMREMAP_WC = 1 << 2,
147         MEMREMAP_ENC = 1 << 3,
148         MEMREMAP_DEC = 1 << 4,
149 };
150 
151 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
152 void memunmap(void *addr);
153 
154 /*
155  * On x86 PAT systems we have memory tracking that keeps track of
156  * the allowed mappings on memory ranges. This tracking works for
157  * all the in-kernel mapping APIs (ioremap*), but where the user
158  * wishes to map a range from a physical device into user memory
159  * the tracking won't be updated. This API is to be used by
160  * drivers which remap physical device pages into userspace,
161  * and wants to make sure they are mapped WC and not UC.
162  */
163 #ifndef arch_io_reserve_memtype_wc
164 static inline int arch_io_reserve_memtype_wc(resource_size_t base,
165                                              resource_size_t size)
166 {
167         return 0;
168 }
169 
170 static inline void arch_io_free_memtype_wc(resource_size_t base,
171                                            resource_size_t size)
172 {
173 }
174 #endif
175 
176 #endif /* _LINUX_IO_H */
177 

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