]>
git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/x86/include/asm/io.h
4 #define ARCH_HAS_IOREMAP_WC
6 #include <linux/compiler.h>
7 #include <asm-generic/int-ll64.h>
10 #define build_mmio_read(name, size, type, reg, barrier) \
11 static inline type name(const volatile void __iomem *addr) \
12 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \
13 :"m" (*(volatile type __force *)addr) barrier); return ret; }
15 #define build_mmio_write(name, size, type, reg, barrier) \
16 static inline void name(type val, volatile void __iomem *addr) \
17 { asm volatile("mov" size " %0,%1": :reg (val), \
18 "m" (*(volatile type __force *)addr) barrier); }
20 build_mmio_read(readb
, "b", unsigned char, "=q", :"memory")
21 build_mmio_read(readw
, "w", unsigned short, "=r", :"memory")
22 build_mmio_read(readl
, "l", unsigned int, "=r", :"memory")
24 build_mmio_read(__readb
, "b", unsigned char, "=q", )
25 build_mmio_read(__readw
, "w", unsigned short, "=r", )
26 build_mmio_read(__readl
, "l", unsigned int, "=r", )
28 build_mmio_write(writeb
, "b", unsigned char, "q", :"memory")
29 build_mmio_write(writew
, "w", unsigned short, "r", :"memory")
30 build_mmio_write(writel
, "l", unsigned int, "r", :"memory")
32 build_mmio_write(__writeb
, "b", unsigned char, "q", )
33 build_mmio_write(__writew
, "w", unsigned short, "r", )
34 build_mmio_write(__writel
, "l", unsigned int, "r", )
36 #define readb_relaxed(a) __readb(a)
37 #define readw_relaxed(a) __readw(a)
38 #define readl_relaxed(a) __readl(a)
39 #define __raw_readb __readb
40 #define __raw_readw __readw
41 #define __raw_readl __readl
43 #define __raw_writeb __writeb
44 #define __raw_writew __writew
45 #define __raw_writel __writel
47 #define mmiowb() barrier()
51 build_mmio_read(readq
, "q", unsigned long, "=r", :"memory")
52 build_mmio_write(writeq
, "q", unsigned long, "r", :"memory")
56 static inline __u64
readq(const volatile void __iomem
*addr
)
58 const volatile u32 __iomem
*p
= addr
;
64 return low
+ ((u64
)high
<< 32);
67 static inline void writeq(__u64 val
, volatile void __iomem
*addr
)
70 writel(val
>> 32, addr
+4);
75 #define readq_relaxed(a) readq(a)
77 #define __raw_readq(a) readq(a)
78 #define __raw_writeq(val, addr) writeq(val, addr)
80 /* Let people know that we have them */
85 * virt_to_phys - map virtual addresses to physical
86 * @address: address to remap
88 * The returned physical address is the physical (CPU) mapping for
89 * the memory address given. It is only valid to use this function on
90 * addresses directly mapped or allocated via kmalloc.
92 * This function does not give bus mappings for DMA transfers. In
93 * almost all conceivable cases a device driver should not be using
97 static inline phys_addr_t
virt_to_phys(volatile void *address
)
103 * phys_to_virt - map physical address to virtual
104 * @address: address to remap
106 * The returned virtual address is a current CPU mapping for
107 * the memory address given. It is only valid to use this function on
108 * addresses that have a kernel mapping
110 * This function does not handle bus mappings for DMA transfers. In
111 * almost all conceivable cases a device driver should not be using
115 static inline void *phys_to_virt(phys_addr_t address
)
117 return __va(address
);
121 * Change "struct page" to physical address.
123 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
126 * ISA I/O bus memory addresses are 1:1 with the physical address.
128 #define isa_virt_to_bus virt_to_phys
129 #define isa_page_to_bus page_to_phys
130 #define isa_bus_to_virt phys_to_virt
133 * However PCI ones are not necessarily 1:1 and therefore these interfaces
134 * are forbidden in portable PCI drivers.
136 * Allow them on x86 for legacy drivers, though.
138 #define virt_to_bus virt_to_phys
139 #define bus_to_virt phys_to_virt
142 * ioremap - map bus memory into CPU space
143 * @offset: bus address of the memory
144 * @size: size of the resource to map
146 * ioremap performs a platform specific sequence of operations to
147 * make bus memory CPU accessible via the readb/readw/readl/writeb/
148 * writew/writel functions and the other mmio helpers. The returned
149 * address is not guaranteed to be usable directly as a virtual
152 * If the area you are trying to map is a PCI BAR you should have a
153 * look at pci_iomap().
155 extern void __iomem
*ioremap_nocache(resource_size_t offset
, unsigned long size
);
156 extern void __iomem
*ioremap_cache(resource_size_t offset
, unsigned long size
);
157 extern void __iomem
*ioremap_prot(resource_size_t offset
, unsigned long size
,
158 unsigned long prot_val
);
161 * The default ioremap() behavior is non-cached:
163 static inline void __iomem
*ioremap(resource_size_t offset
, unsigned long size
)
165 return ioremap_nocache(offset
, size
);
168 extern void iounmap(volatile void __iomem
*addr
);
170 extern void __iomem
*fix_ioremap(unsigned idx
, unsigned long phys
);
179 extern void *xlate_dev_mem_ptr(unsigned long phys
);
180 extern void unxlate_dev_mem_ptr(unsigned long phys
, void *addr
);
182 extern int ioremap_change_attr(unsigned long vaddr
, unsigned long size
,
183 unsigned long prot_val
);
184 extern void __iomem
*ioremap_wc(resource_size_t offset
, unsigned long size
);
187 * early_ioremap() and early_iounmap() are for temporary early boot-time
188 * mappings, before the real ioremap() is functional.
189 * A boot-time mapping is currently limited to at most 16 pages.
191 extern void early_ioremap_init(void);
192 extern void early_ioremap_reset(void);
193 extern void __iomem
*early_ioremap(unsigned long offset
, unsigned long size
);
194 extern void __iomem
*early_memremap(unsigned long offset
, unsigned long size
);
195 extern void early_iounmap(void __iomem
*addr
, unsigned long size
);
196 extern void __iomem
*fix_ioremap(unsigned idx
, unsigned long phys
);
198 #define IO_SPACE_LIMIT 0xffff
200 #endif /* _ASM_X86_IO_H */