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1965aae3 PA |
1 | #ifndef _ASM_X86_IO_H |
2 | #define _ASM_X86_IO_H | |
e045fb2a | 3 | |
1c5b9069 BG |
4 | /* |
5 | * This file contains the definitions for the x86 IO instructions | |
6 | * inb/inw/inl/outb/outw/outl and the "string versions" of the same | |
7 | * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" | |
8 | * versions of the single-IO instructions (inb_p/inw_p/..). | |
9 | * | |
10 | * This file is not meant to be obfuscating: it's just complicated | |
11 | * to (a) handle it all in a way that makes gcc able to optimize it | |
12 | * as well as possible and (b) trying to avoid writing the same thing | |
13 | * over and over again with slight variations and possibly making a | |
14 | * mistake somewhere. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Thanks to James van Artsdalen for a better timing-fix than | |
19 | * the two short jumps: using outb's to a nonexistent port seems | |
20 | * to guarantee better timings even on fast machines. | |
21 | * | |
22 | * On the other hand, I'd like to be sure of a non-existent port: | |
23 | * I feel a bit unsafe about using 0x80 (should be safe, though) | |
24 | * | |
25 | * Linus | |
26 | */ | |
27 | ||
28 | /* | |
29 | * Bit simplified and optimized by Jan Hubicka | |
30 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999. | |
31 | * | |
32 | * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added, | |
33 | * isa_read[wl] and isa_write[wl] fixed | |
34 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
35 | */ | |
36 | ||
b310f381 | 37 | #define ARCH_HAS_IOREMAP_WC |
38 | ||
1c5b9069 | 39 | #include <linux/string.h> |
c1f64a58 | 40 | #include <linux/compiler.h> |
976e8f67 | 41 | #include <asm/page.h> |
c1f64a58 LT |
42 | |
43 | #define build_mmio_read(name, size, type, reg, barrier) \ | |
44 | static inline type name(const volatile void __iomem *addr) \ | |
1c5b0eb6 | 45 | { type ret; asm volatile("mov" size " %1,%0":reg (ret) \ |
c1f64a58 LT |
46 | :"m" (*(volatile type __force *)addr) barrier); return ret; } |
47 | ||
48 | #define build_mmio_write(name, size, type, reg, barrier) \ | |
49 | static inline void name(type val, volatile void __iomem *addr) \ | |
50 | { asm volatile("mov" size " %0,%1": :reg (val), \ | |
51 | "m" (*(volatile type __force *)addr) barrier); } | |
52 | ||
1c5b0eb6 MP |
53 | build_mmio_read(readb, "b", unsigned char, "=q", :"memory") |
54 | build_mmio_read(readw, "w", unsigned short, "=r", :"memory") | |
55 | build_mmio_read(readl, "l", unsigned int, "=r", :"memory") | |
c1f64a58 | 56 | |
1c5b0eb6 MP |
57 | build_mmio_read(__readb, "b", unsigned char, "=q", ) |
58 | build_mmio_read(__readw, "w", unsigned short, "=r", ) | |
59 | build_mmio_read(__readl, "l", unsigned int, "=r", ) | |
c1f64a58 LT |
60 | |
61 | build_mmio_write(writeb, "b", unsigned char, "q", :"memory") | |
62 | build_mmio_write(writew, "w", unsigned short, "r", :"memory") | |
63 | build_mmio_write(writel, "l", unsigned int, "r", :"memory") | |
64 | ||
65 | build_mmio_write(__writeb, "b", unsigned char, "q", ) | |
66 | build_mmio_write(__writew, "w", unsigned short, "r", ) | |
67 | build_mmio_write(__writel, "l", unsigned int, "r", ) | |
68 | ||
69 | #define readb_relaxed(a) __readb(a) | |
70 | #define readw_relaxed(a) __readw(a) | |
71 | #define readl_relaxed(a) __readl(a) | |
72 | #define __raw_readb __readb | |
73 | #define __raw_readw __readw | |
74 | #define __raw_readl __readl | |
75 | ||
76 | #define __raw_writeb __writeb | |
77 | #define __raw_writew __writew | |
78 | #define __raw_writel __writel | |
79 | ||
80 | #define mmiowb() barrier() | |
81 | ||
82 | #ifdef CONFIG_X86_64 | |
93093d09 | 83 | |
1c5b0eb6 | 84 | build_mmio_read(readq, "q", unsigned long, "=r", :"memory") |
c1f64a58 | 85 | build_mmio_write(writeq, "q", unsigned long, "r", :"memory") |
c1f64a58 | 86 | |
93093d09 IM |
87 | #define readq_relaxed(a) readq(a) |
88 | ||
89 | #define __raw_readq(a) readq(a) | |
90 | #define __raw_writeq(val, addr) writeq(val, addr) | |
91 | ||
a0b1131e | 92 | /* Let people know that we have them */ |
93093d09 IM |
93 | #define readq readq |
94 | #define writeq writeq | |
2c5643b1 | 95 | |
dbee8a0a RD |
96 | #endif |
97 | ||
976e8f67 JF |
98 | /** |
99 | * virt_to_phys - map virtual addresses to physical | |
100 | * @address: address to remap | |
101 | * | |
102 | * The returned physical address is the physical (CPU) mapping for | |
103 | * the memory address given. It is only valid to use this function on | |
104 | * addresses directly mapped or allocated via kmalloc. | |
105 | * | |
106 | * This function does not give bus mappings for DMA transfers. In | |
107 | * almost all conceivable cases a device driver should not be using | |
108 | * this function | |
109 | */ | |
110 | ||
111 | static inline phys_addr_t virt_to_phys(volatile void *address) | |
112 | { | |
113 | return __pa(address); | |
114 | } | |
115 | ||
116 | /** | |
117 | * phys_to_virt - map physical address to virtual | |
118 | * @address: address to remap | |
119 | * | |
120 | * The returned virtual address is a current CPU mapping for | |
121 | * the memory address given. It is only valid to use this function on | |
122 | * addresses that have a kernel mapping | |
123 | * | |
124 | * This function does not handle bus mappings for DMA transfers. In | |
125 | * almost all conceivable cases a device driver should not be using | |
126 | * this function | |
127 | */ | |
128 | ||
129 | static inline void *phys_to_virt(phys_addr_t address) | |
130 | { | |
131 | return __va(address); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Change "struct page" to physical address. | |
136 | */ | |
137 | #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) | |
138 | ||
139 | /* | |
140 | * ISA I/O bus memory addresses are 1:1 with the physical address. | |
a7eb5189 PA |
141 | * However, we truncate the address to unsigned int to avoid undesirable |
142 | * promitions in legacy drivers. | |
976e8f67 | 143 | */ |
a7eb5189 PA |
144 | static inline unsigned int isa_virt_to_bus(volatile void *address) |
145 | { | |
146 | return (unsigned int)virt_to_phys(address); | |
147 | } | |
148 | #define isa_page_to_bus(page) ((unsigned int)page_to_phys(page)) | |
149 | #define isa_bus_to_virt phys_to_virt | |
976e8f67 JF |
150 | |
151 | /* | |
152 | * However PCI ones are not necessarily 1:1 and therefore these interfaces | |
153 | * are forbidden in portable PCI drivers. | |
154 | * | |
155 | * Allow them on x86 for legacy drivers, though. | |
156 | */ | |
157 | #define virt_to_bus virt_to_phys | |
158 | #define bus_to_virt phys_to_virt | |
159 | ||
133822c5 JF |
160 | /** |
161 | * ioremap - map bus memory into CPU space | |
162 | * @offset: bus address of the memory | |
163 | * @size: size of the resource to map | |
164 | * | |
165 | * ioremap performs a platform specific sequence of operations to | |
166 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
167 | * writew/writel functions and the other mmio helpers. The returned | |
168 | * address is not guaranteed to be usable directly as a virtual | |
169 | * address. | |
170 | * | |
171 | * If the area you are trying to map is a PCI BAR you should have a | |
172 | * look at pci_iomap(). | |
173 | */ | |
174 | extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); | |
175 | extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size); | |
176 | extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, | |
177 | unsigned long prot_val); | |
178 | ||
179 | /* | |
180 | * The default ioremap() behavior is non-cached: | |
181 | */ | |
182 | static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) | |
183 | { | |
184 | return ioremap_nocache(offset, size); | |
185 | } | |
186 | ||
187 | extern void iounmap(volatile void __iomem *addr); | |
188 | ||
3ee48b6a | 189 | extern void set_iounmap_nonlazy(void); |
9321b8cb | 190 | |
1c5b9069 BG |
191 | #ifdef __KERNEL__ |
192 | ||
193 | #include <asm-generic/iomap.h> | |
194 | ||
195 | #include <linux/vmalloc.h> | |
196 | ||
197 | /* | |
198 | * Convert a virtual cached pointer to an uncached pointer | |
199 | */ | |
200 | #define xlate_dev_kmem_ptr(p) p | |
201 | ||
202 | static inline void | |
203 | memset_io(volatile void __iomem *addr, unsigned char val, size_t count) | |
204 | { | |
205 | memset((void __force *)addr, val, count); | |
206 | } | |
207 | ||
208 | static inline void | |
209 | memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count) | |
210 | { | |
211 | memcpy(dst, (const void __force *)src, count); | |
212 | } | |
213 | ||
214 | static inline void | |
215 | memcpy_toio(volatile void __iomem *dst, const void *src, size_t count) | |
216 | { | |
217 | memcpy((void __force *)dst, src, count); | |
218 | } | |
219 | ||
220 | /* | |
221 | * ISA space is 'always mapped' on a typical x86 system, no need to | |
222 | * explicitly ioremap() it. The fact that the ISA IO space is mapped | |
223 | * to PAGE_OFFSET is pure coincidence - it does not mean ISA values | |
224 | * are physical addresses. The following constant pointer can be | |
225 | * used as the IO-area pointer (it can be iounmapped as well, so the | |
226 | * analogy with PCI is quite large): | |
227 | */ | |
228 | #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) | |
229 | ||
230 | /* | |
231 | * Cache management | |
232 | * | |
233 | * This needed for two cases | |
234 | * 1. Out of order aware processors | |
235 | * 2. Accidentally out of order processors (PPro errata #51) | |
236 | */ | |
237 | ||
238 | static inline void flush_write_buffers(void) | |
239 | { | |
240 | #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE) | |
241 | asm volatile("lock; addl $0,0(%%esp)": : :"memory"); | |
242 | #endif | |
243 | } | |
244 | ||
245 | #endif /* __KERNEL__ */ | |
246 | ||
247 | extern void native_io_delay(void); | |
248 | ||
249 | extern int io_delay_type; | |
250 | extern void io_delay_init(void); | |
251 | ||
252 | #if defined(CONFIG_PARAVIRT) | |
253 | #include <asm/paravirt.h> | |
96a388de | 254 | #else |
1c5b9069 BG |
255 | |
256 | static inline void slow_down_io(void) | |
257 | { | |
258 | native_io_delay(); | |
259 | #ifdef REALLY_SLOW_IO | |
260 | native_io_delay(); | |
261 | native_io_delay(); | |
262 | native_io_delay(); | |
96a388de | 263 | #endif |
1c5b9069 BG |
264 | } |
265 | ||
266 | #endif | |
267 | ||
268 | #define BUILDIO(bwl, bw, type) \ | |
269 | static inline void out##bwl(unsigned type value, int port) \ | |
270 | { \ | |
271 | asm volatile("out" #bwl " %" #bw "0, %w1" \ | |
272 | : : "a"(value), "Nd"(port)); \ | |
273 | } \ | |
274 | \ | |
275 | static inline unsigned type in##bwl(int port) \ | |
276 | { \ | |
277 | unsigned type value; \ | |
278 | asm volatile("in" #bwl " %w1, %" #bw "0" \ | |
279 | : "=a"(value) : "Nd"(port)); \ | |
280 | return value; \ | |
281 | } \ | |
282 | \ | |
283 | static inline void out##bwl##_p(unsigned type value, int port) \ | |
284 | { \ | |
285 | out##bwl(value, port); \ | |
286 | slow_down_io(); \ | |
287 | } \ | |
288 | \ | |
289 | static inline unsigned type in##bwl##_p(int port) \ | |
290 | { \ | |
291 | unsigned type value = in##bwl(port); \ | |
292 | slow_down_io(); \ | |
293 | return value; \ | |
294 | } \ | |
295 | \ | |
296 | static inline void outs##bwl(int port, const void *addr, unsigned long count) \ | |
297 | { \ | |
298 | asm volatile("rep; outs" #bwl \ | |
299 | : "+S"(addr), "+c"(count) : "d"(port)); \ | |
300 | } \ | |
301 | \ | |
302 | static inline void ins##bwl(int port, void *addr, unsigned long count) \ | |
303 | { \ | |
304 | asm volatile("rep; ins" #bwl \ | |
305 | : "+D"(addr), "+c"(count) : "d"(port)); \ | |
306 | } | |
307 | ||
308 | BUILDIO(b, b, char) | |
309 | BUILDIO(w, w, short) | |
310 | BUILDIO(l, , int) | |
e045fb2a | 311 | |
312 | extern void *xlate_dev_mem_ptr(unsigned long phys); | |
313 | extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr); | |
314 | ||
3a96ce8c | 315 | extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
316 | unsigned long prot_val); | |
d639bab8 | 317 | extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); |
3a96ce8c | 318 | |
4583ed51 JF |
319 | /* |
320 | * early_ioremap() and early_iounmap() are for temporary early boot-time | |
321 | * mappings, before the real ioremap() is functional. | |
322 | * A boot-time mapping is currently limited to at most 16 pages. | |
323 | */ | |
324 | extern void early_ioremap_init(void); | |
4583ed51 | 325 | extern void early_ioremap_reset(void); |
9b987aeb MH |
326 | extern void __iomem *early_ioremap(resource_size_t phys_addr, |
327 | unsigned long size); | |
328 | extern void __iomem *early_memremap(resource_size_t phys_addr, | |
329 | unsigned long size); | |
1d6cf1fe | 330 | extern void early_iounmap(void __iomem *addr, unsigned long size); |
e67a807f | 331 | extern void fixup_early_ioremap(void); |
fef5ba79 | 332 | extern bool is_early_ioremap_ptep(pte_t *ptep); |
4583ed51 | 333 | |
d8e04206 | 334 | #ifdef CONFIG_XEN |
33f35f2a | 335 | #include <xen/xen.h> |
d8e04206 JF |
336 | struct bio_vec; |
337 | ||
338 | extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, | |
339 | const struct bio_vec *vec2); | |
340 | ||
341 | #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ | |
342 | (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ | |
343 | (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) | |
344 | #endif /* CONFIG_XEN */ | |
345 | ||
a448720c | 346 | #define IO_SPACE_LIMIT 0xffff |
4583ed51 | 347 | |
1965aae3 | 348 | #endif /* _ASM_X86_IO_H */ |