tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _ASM_X86_IO_H
2#define _ASM_X86_IO_H
3
4#define ARCH_HAS_IOREMAP_WC
5
6#include <linux/compiler.h>
7#include <asm-generic/int-ll64.h>
8#include <asm/page.h>
9
10#define build_mmio_read(name, size, type, reg, barrier) \
11static 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; }
14
15#define build_mmio_write(name, size, type, reg, barrier) \
16static 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); }
19
20build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
21build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
22build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
23
24build_mmio_read(__readb, "b", unsigned char, "=q", )
25build_mmio_read(__readw, "w", unsigned short, "=r", )
26build_mmio_read(__readl, "l", unsigned int, "=r", )
27
28build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
29build_mmio_write(writew, "w", unsigned short, "r", :"memory")
30build_mmio_write(writel, "l", unsigned int, "r", :"memory")
31
32build_mmio_write(__writeb, "b", unsigned char, "q", )
33build_mmio_write(__writew, "w", unsigned short, "r", )
34build_mmio_write(__writel, "l", unsigned int, "r", )
35
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
42
43#define __raw_writeb __writeb
44#define __raw_writew __writew
45#define __raw_writel __writel
46
47#define mmiowb() barrier()
48
49#ifdef CONFIG_X86_64
50
51build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
52build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
53
54#else
55
56static inline __u64 readq(const volatile void __iomem *addr)
57{
58 const volatile u32 __iomem *p = addr;
59 u32 low, high;
60
61 low = readl(p);
62 high = readl(p + 1);
63
64 return low + ((u64)high << 32);
65}
66
67static inline void writeq(__u64 val, volatile void __iomem *addr)
68{
69 writel(val, addr);
70 writel(val >> 32, addr+4);
71}
72
73#endif
74
75#define readq_relaxed(a) readq(a)
76
77#define __raw_readq(a) readq(a)
78#define __raw_writeq(val, addr) writeq(val, addr)
79
80/* Let people know that we have them */
81#define readq readq
82#define writeq writeq
83
84/**
85 * virt_to_phys - map virtual addresses to physical
86 * @address: address to remap
87 *
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.
91 *
92 * This function does not give bus mappings for DMA transfers. In
93 * almost all conceivable cases a device driver should not be using
94 * this function
95 */
96
97static inline phys_addr_t virt_to_phys(volatile void *address)
98{
99 return __pa(address);
100}
101
102/**
103 * phys_to_virt - map physical address to virtual
104 * @address: address to remap
105 *
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
109 *
110 * This function does not handle bus mappings for DMA transfers. In
111 * almost all conceivable cases a device driver should not be using
112 * this function
113 */
114
115static inline void *phys_to_virt(phys_addr_t address)
116{
117 return __va(address);
118}
119
120/*
121 * Change "struct page" to physical address.
122 */
123#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
124
125/*
126 * ISA I/O bus memory addresses are 1:1 with the physical address.
127 * However, we truncate the address to unsigned int to avoid undesirable
128 * promitions in legacy drivers.
129 */
130static inline unsigned int isa_virt_to_bus(volatile void *address)
131{
132 return (unsigned int)virt_to_phys(address);
133}
134#define isa_page_to_bus(page) ((unsigned int)page_to_phys(page))
135#define isa_bus_to_virt phys_to_virt
136
137/*
138 * However PCI ones are not necessarily 1:1 and therefore these interfaces
139 * are forbidden in portable PCI drivers.
140 *
141 * Allow them on x86 for legacy drivers, though.
142 */
143#define virt_to_bus virt_to_phys
144#define bus_to_virt phys_to_virt
145
146/**
147 * ioremap - map bus memory into CPU space
148 * @offset: bus address of the memory
149 * @size: size of the resource to map
150 *
151 * ioremap performs a platform specific sequence of operations to
152 * make bus memory CPU accessible via the readb/readw/readl/writeb/
153 * writew/writel functions and the other mmio helpers. The returned
154 * address is not guaranteed to be usable directly as a virtual
155 * address.
156 *
157 * If the area you are trying to map is a PCI BAR you should have a
158 * look at pci_iomap().
159 */
160extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
161extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
162extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
163 unsigned long prot_val);
164
165/*
166 * The default ioremap() behavior is non-cached:
167 */
168static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
169{
170 return ioremap_nocache(offset, size);
171}
172
173extern void iounmap(volatile void __iomem *addr);
174
175
176#ifdef CONFIG_X86_32
177# include "io_32.h"
178#else
179# include "io_64.h"
180#endif
181
182extern void *xlate_dev_mem_ptr(unsigned long phys);
183extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
184
185extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
186 unsigned long prot_val);
187extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
188
189/*
190 * early_ioremap() and early_iounmap() are for temporary early boot-time
191 * mappings, before the real ioremap() is functional.
192 * A boot-time mapping is currently limited to at most 16 pages.
193 */
194extern void early_ioremap_init(void);
195extern void early_ioremap_reset(void);
196extern void __iomem *early_ioremap(resource_size_t phys_addr,
197 unsigned long size);
198extern void __iomem *early_memremap(resource_size_t phys_addr,
199 unsigned long size);
200extern void early_iounmap(void __iomem *addr, unsigned long size);
201
202#define IO_SPACE_LIMIT 0xffff
203
204#endif /* _ASM_X86_IO_H */