Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_IO_H |
3 | #define _ASM_X86_IO_H | |
e045fb2a | 4 | |
1c5b9069 BG |
5 | /* |
6 | * This file contains the definitions for the x86 IO instructions | |
7 | * inb/inw/inl/outb/outw/outl and the "string versions" of the same | |
8 | * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" | |
9 | * versions of the single-IO instructions (inb_p/inw_p/..). | |
10 | * | |
11 | * This file is not meant to be obfuscating: it's just complicated | |
12 | * to (a) handle it all in a way that makes gcc able to optimize it | |
13 | * as well as possible and (b) trying to avoid writing the same thing | |
14 | * over and over again with slight variations and possibly making a | |
15 | * mistake somewhere. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Thanks to James van Artsdalen for a better timing-fix than | |
20 | * the two short jumps: using outb's to a nonexistent port seems | |
21 | * to guarantee better timings even on fast machines. | |
22 | * | |
23 | * On the other hand, I'd like to be sure of a non-existent port: | |
24 | * I feel a bit unsafe about using 0x80 (should be safe, though) | |
25 | * | |
26 | * Linus | |
27 | */ | |
28 | ||
29 | /* | |
30 | * Bit simplified and optimized by Jan Hubicka | |
31 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999. | |
32 | * | |
33 | * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added, | |
34 | * isa_read[wl] and isa_write[wl] fixed | |
35 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
36 | */ | |
37 | ||
b310f381 | 38 | #define ARCH_HAS_IOREMAP_WC |
d838270e | 39 | #define ARCH_HAS_IOREMAP_WT |
b310f381 | 40 | |
1c5b9069 | 41 | #include <linux/string.h> |
c1f64a58 | 42 | #include <linux/compiler.h> |
8260b982 | 43 | #include <linux/cc_platform.h> |
976e8f67 | 44 | #include <asm/page.h> |
5b7c73e0 | 45 | #include <asm/early_ioremap.h> |
d6472302 | 46 | #include <asm/pgtable_types.h> |
1e8f93e1 | 47 | #include <asm/shared/io.h> |
c1f64a58 LT |
48 | |
49 | #define build_mmio_read(name, size, type, reg, barrier) \ | |
50 | static inline type name(const volatile void __iomem *addr) \ | |
1c5b0eb6 | 51 | { type ret; asm volatile("mov" size " %1,%0":reg (ret) \ |
c1f64a58 LT |
52 | :"m" (*(volatile type __force *)addr) barrier); return ret; } |
53 | ||
54 | #define build_mmio_write(name, size, type, reg, barrier) \ | |
55 | static inline void name(type val, volatile void __iomem *addr) \ | |
56 | { asm volatile("mov" size " %0,%1": :reg (val), \ | |
57 | "m" (*(volatile type __force *)addr) barrier); } | |
58 | ||
1c5b0eb6 MP |
59 | build_mmio_read(readb, "b", unsigned char, "=q", :"memory") |
60 | build_mmio_read(readw, "w", unsigned short, "=r", :"memory") | |
61 | build_mmio_read(readl, "l", unsigned int, "=r", :"memory") | |
c1f64a58 | 62 | |
1c5b0eb6 MP |
63 | build_mmio_read(__readb, "b", unsigned char, "=q", ) |
64 | build_mmio_read(__readw, "w", unsigned short, "=r", ) | |
65 | build_mmio_read(__readl, "l", unsigned int, "=r", ) | |
c1f64a58 LT |
66 | |
67 | build_mmio_write(writeb, "b", unsigned char, "q", :"memory") | |
68 | build_mmio_write(writew, "w", unsigned short, "r", :"memory") | |
69 | build_mmio_write(writel, "l", unsigned int, "r", :"memory") | |
70 | ||
71 | build_mmio_write(__writeb, "b", unsigned char, "q", ) | |
72 | build_mmio_write(__writew, "w", unsigned short, "r", ) | |
73 | build_mmio_write(__writel, "l", unsigned int, "r", ) | |
74 | ||
80b9ece1 AS |
75 | #define readb readb |
76 | #define readw readw | |
77 | #define readl readl | |
c1f64a58 LT |
78 | #define readb_relaxed(a) __readb(a) |
79 | #define readw_relaxed(a) __readw(a) | |
80 | #define readl_relaxed(a) __readl(a) | |
81 | #define __raw_readb __readb | |
82 | #define __raw_readw __readw | |
83 | #define __raw_readl __readl | |
84 | ||
80b9ece1 AS |
85 | #define writeb writeb |
86 | #define writew writew | |
87 | #define writel writel | |
cbc908ef WD |
88 | #define writeb_relaxed(v, a) __writeb(v, a) |
89 | #define writew_relaxed(v, a) __writew(v, a) | |
90 | #define writel_relaxed(v, a) __writel(v, a) | |
c1f64a58 LT |
91 | #define __raw_writeb __writeb |
92 | #define __raw_writew __writew | |
93 | #define __raw_writel __writel | |
94 | ||
c1f64a58 | 95 | #ifdef CONFIG_X86_64 |
93093d09 | 96 | |
6469a0ee AS |
97 | build_mmio_read(readq, "q", u64, "=r", :"memory") |
98 | build_mmio_read(__readq, "q", u64, "=r", ) | |
99 | build_mmio_write(writeq, "q", u64, "r", :"memory") | |
100 | build_mmio_write(__writeq, "q", u64, "r", ) | |
c1f64a58 | 101 | |
9683a64f AS |
102 | #define readq_relaxed(a) __readq(a) |
103 | #define writeq_relaxed(v, a) __writeq(v, a) | |
93093d09 | 104 | |
9683a64f AS |
105 | #define __raw_readq __readq |
106 | #define __raw_writeq __writeq | |
93093d09 | 107 | |
a0b1131e | 108 | /* Let people know that we have them */ |
93093d09 IM |
109 | #define readq readq |
110 | #define writeq writeq | |
2c5643b1 | 111 | |
dbee8a0a RD |
112 | #endif |
113 | ||
be62a320 CB |
114 | #define ARCH_HAS_VALID_PHYS_ADDR_RANGE |
115 | extern int valid_phys_addr_range(phys_addr_t addr, size_t size); | |
116 | extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); | |
117 | ||
976e8f67 JF |
118 | /** |
119 | * virt_to_phys - map virtual addresses to physical | |
120 | * @address: address to remap | |
121 | * | |
122 | * The returned physical address is the physical (CPU) mapping for | |
123 | * the memory address given. It is only valid to use this function on | |
124 | * addresses directly mapped or allocated via kmalloc. | |
125 | * | |
126 | * This function does not give bus mappings for DMA transfers. In | |
127 | * almost all conceivable cases a device driver should not be using | |
128 | * this function | |
129 | */ | |
130 | ||
131 | static inline phys_addr_t virt_to_phys(volatile void *address) | |
132 | { | |
133 | return __pa(address); | |
134 | } | |
80b9ece1 | 135 | #define virt_to_phys virt_to_phys |
976e8f67 JF |
136 | |
137 | /** | |
138 | * phys_to_virt - map physical address to virtual | |
139 | * @address: address to remap | |
140 | * | |
141 | * The returned virtual address is a current CPU mapping for | |
142 | * the memory address given. It is only valid to use this function on | |
143 | * addresses that have a kernel mapping | |
144 | * | |
145 | * This function does not handle bus mappings for DMA transfers. In | |
146 | * almost all conceivable cases a device driver should not be using | |
147 | * this function | |
148 | */ | |
149 | ||
150 | static inline void *phys_to_virt(phys_addr_t address) | |
151 | { | |
152 | return __va(address); | |
153 | } | |
80b9ece1 | 154 | #define phys_to_virt phys_to_virt |
976e8f67 JF |
155 | |
156 | /* | |
157 | * Change "struct page" to physical address. | |
158 | */ | |
159 | #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) | |
160 | ||
161 | /* | |
162 | * ISA I/O bus memory addresses are 1:1 with the physical address. | |
a7eb5189 | 163 | * However, we truncate the address to unsigned int to avoid undesirable |
d9f6e12f | 164 | * promotions in legacy drivers. |
976e8f67 | 165 | */ |
a7eb5189 PA |
166 | static inline unsigned int isa_virt_to_bus(volatile void *address) |
167 | { | |
168 | return (unsigned int)virt_to_phys(address); | |
169 | } | |
a7eb5189 | 170 | #define isa_bus_to_virt phys_to_virt |
976e8f67 | 171 | |
f5857666 JC |
172 | /* |
173 | * The default ioremap() behavior is non-cached; if you need something | |
174 | * else, you probably want one of the following. | |
175 | */ | |
f5857666 JC |
176 | extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size); |
177 | #define ioremap_uc ioremap_uc | |
f5857666 | 178 | extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size); |
80b9ece1 | 179 | #define ioremap_cache ioremap_cache |
f5857666 | 180 | extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val); |
80b9ece1 | 181 | #define ioremap_prot ioremap_prot |
c3a7a61c LJ |
182 | extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size); |
183 | #define ioremap_encrypted ioremap_encrypted | |
f5857666 | 184 | |
133822c5 JF |
185 | /** |
186 | * ioremap - map bus memory into CPU space | |
187 | * @offset: bus address of the memory | |
188 | * @size: size of the resource to map | |
189 | * | |
190 | * ioremap performs a platform specific sequence of operations to | |
191 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
192 | * writew/writel functions and the other mmio helpers. The returned | |
193 | * address is not guaranteed to be usable directly as a virtual | |
194 | * address. | |
195 | * | |
196 | * If the area you are trying to map is a PCI BAR you should have a | |
197 | * look at pci_iomap(). | |
198 | */ | |
c0d94aa5 | 199 | void __iomem *ioremap(resource_size_t offset, unsigned long size); |
80b9ece1 | 200 | #define ioremap ioremap |
133822c5 JF |
201 | |
202 | extern void iounmap(volatile void __iomem *addr); | |
80b9ece1 | 203 | #define iounmap iounmap |
133822c5 | 204 | |
1c5b9069 BG |
205 | #ifdef __KERNEL__ |
206 | ||
170d13ca LT |
207 | void memcpy_fromio(void *, const volatile void __iomem *, size_t); |
208 | void memcpy_toio(volatile void __iomem *, const void *, size_t); | |
209 | void memset_io(volatile void __iomem *, int, size_t); | |
210 | ||
211 | #define memcpy_fromio memcpy_fromio | |
212 | #define memcpy_toio memcpy_toio | |
213 | #define memset_io memset_io | |
214 | ||
1c5b9069 BG |
215 | #include <asm-generic/iomap.h> |
216 | ||
1c5b9069 BG |
217 | /* |
218 | * ISA space is 'always mapped' on a typical x86 system, no need to | |
219 | * explicitly ioremap() it. The fact that the ISA IO space is mapped | |
220 | * to PAGE_OFFSET is pure coincidence - it does not mean ISA values | |
221 | * are physical addresses. The following constant pointer can be | |
222 | * used as the IO-area pointer (it can be iounmapped as well, so the | |
223 | * analogy with PCI is quite large): | |
224 | */ | |
225 | #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) | |
226 | ||
1c5b9069 BG |
227 | #endif /* __KERNEL__ */ |
228 | ||
229 | extern void native_io_delay(void); | |
230 | ||
231 | extern int io_delay_type; | |
232 | extern void io_delay_init(void); | |
233 | ||
234 | #if defined(CONFIG_PARAVIRT) | |
235 | #include <asm/paravirt.h> | |
96a388de | 236 | #else |
1c5b9069 BG |
237 | |
238 | static inline void slow_down_io(void) | |
239 | { | |
240 | native_io_delay(); | |
241 | #ifdef REALLY_SLOW_IO | |
242 | native_io_delay(); | |
243 | native_io_delay(); | |
244 | native_io_delay(); | |
96a388de | 245 | #endif |
1c5b9069 BG |
246 | } |
247 | ||
248 | #endif | |
249 | ||
250 | #define BUILDIO(bwl, bw, type) \ | |
15104de1 | 251 | static inline void out##bwl##_p(type value, u16 port) \ |
1c5b9069 BG |
252 | { \ |
253 | out##bwl(value, port); \ | |
254 | slow_down_io(); \ | |
255 | } \ | |
256 | \ | |
15104de1 | 257 | static inline type in##bwl##_p(u16 port) \ |
1c5b9069 | 258 | { \ |
15104de1 | 259 | type value = in##bwl(port); \ |
1c5b9069 BG |
260 | slow_down_io(); \ |
261 | return value; \ | |
262 | } \ | |
263 | \ | |
15104de1 | 264 | static inline void outs##bwl(u16 port, const void *addr, unsigned long count) \ |
1c5b9069 | 265 | { \ |
8260b982 | 266 | if (cc_platform_has(CC_ATTR_GUEST_UNROLL_STRING_IO)) { \ |
15104de1 | 267 | type *value = (type *)addr; \ |
606b21d4 TL |
268 | while (count) { \ |
269 | out##bwl(*value, port); \ | |
270 | value++; \ | |
271 | count--; \ | |
272 | } \ | |
273 | } else { \ | |
274 | asm volatile("rep; outs" #bwl \ | |
275 | : "+S"(addr), "+c"(count) \ | |
276 | : "d"(port) : "memory"); \ | |
277 | } \ | |
1c5b9069 BG |
278 | } \ |
279 | \ | |
15104de1 | 280 | static inline void ins##bwl(u16 port, void *addr, unsigned long count) \ |
1c5b9069 | 281 | { \ |
8260b982 | 282 | if (cc_platform_has(CC_ATTR_GUEST_UNROLL_STRING_IO)) { \ |
15104de1 | 283 | type *value = (type *)addr; \ |
606b21d4 TL |
284 | while (count) { \ |
285 | *value = in##bwl(port); \ | |
286 | value++; \ | |
287 | count--; \ | |
288 | } \ | |
289 | } else { \ | |
290 | asm volatile("rep; ins" #bwl \ | |
291 | : "+D"(addr), "+c"(count) \ | |
292 | : "d"(port) : "memory"); \ | |
293 | } \ | |
1c5b9069 BG |
294 | } |
295 | ||
15104de1 KS |
296 | BUILDIO(b, b, u8) |
297 | BUILDIO(w, w, u16) | |
298 | BUILDIO(l, , u32) | |
1e8f93e1 | 299 | #undef BUILDIO |
e045fb2a | 300 | |
80b9ece1 AS |
301 | #define inb_p inb_p |
302 | #define inw_p inw_p | |
303 | #define inl_p inl_p | |
304 | #define insb insb | |
305 | #define insw insw | |
306 | #define insl insl | |
307 | ||
80b9ece1 AS |
308 | #define outb_p outb_p |
309 | #define outw_p outw_p | |
310 | #define outl_p outl_p | |
311 | #define outsb outsb | |
312 | #define outsw outsw | |
313 | #define outsl outsl | |
314 | ||
4707a341 TR |
315 | extern void *xlate_dev_mem_ptr(phys_addr_t phys); |
316 | extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr); | |
e045fb2a | 317 | |
80b9ece1 AS |
318 | #define xlate_dev_mem_ptr xlate_dev_mem_ptr |
319 | #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr | |
320 | ||
3a96ce8c | 321 | extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
b14097bd | 322 | enum page_cache_mode pcm); |
d639bab8 | 323 | extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); |
80b9ece1 | 324 | #define ioremap_wc ioremap_wc |
d838270e | 325 | extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size); |
80b9ece1 | 326 | #define ioremap_wt ioremap_wt |
3a96ce8c | 327 | |
fef5ba79 | 328 | extern bool is_early_ioremap_ptep(pte_t *ptep); |
4583ed51 | 329 | |
a448720c | 330 | #define IO_SPACE_LIMIT 0xffff |
4583ed51 | 331 | |
31952011 AS |
332 | #include <asm-generic/io.h> |
333 | #undef PCI_IOBASE | |
334 | ||
d0d98eed | 335 | #ifdef CONFIG_MTRR |
7d010fdf LR |
336 | extern int __must_check arch_phys_wc_index(int handle); |
337 | #define arch_phys_wc_index arch_phys_wc_index | |
338 | ||
d0d98eed AL |
339 | extern int __must_check arch_phys_wc_add(unsigned long base, |
340 | unsigned long size); | |
341 | extern void arch_phys_wc_del(int handle); | |
342 | #define arch_phys_wc_add arch_phys_wc_add | |
343 | #endif | |
344 | ||
8ef42276 DA |
345 | #ifdef CONFIG_X86_PAT |
346 | extern int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size); | |
347 | extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size); | |
348 | #define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc | |
349 | #endif | |
350 | ||
402fe0cb | 351 | #ifdef CONFIG_AMD_MEM_ENCRYPT |
8f716c9b TL |
352 | extern bool arch_memremap_can_ram_remap(resource_size_t offset, |
353 | unsigned long size, | |
354 | unsigned long flags); | |
355 | #define arch_memremap_can_ram_remap arch_memremap_can_ram_remap | |
356 | ||
8458bf94 TL |
357 | extern bool phys_mem_access_encrypted(unsigned long phys_addr, |
358 | unsigned long size); | |
402fe0cb TL |
359 | #else |
360 | static inline bool phys_mem_access_encrypted(unsigned long phys_addr, | |
361 | unsigned long size) | |
362 | { | |
363 | return true; | |
364 | } | |
365 | #endif | |
8458bf94 | 366 | |
232bb01b DJ |
367 | /** |
368 | * iosubmit_cmds512 - copy data to single MMIO location, in 512-bit units | |
0888e103 | 369 | * @dst: destination, in MMIO space (must be 512-bit aligned) |
232bb01b DJ |
370 | * @src: source |
371 | * @count: number of 512 bits quantities to submit | |
372 | * | |
373 | * Submit data from kernel space to MMIO space, in units of 512 bits at a | |
374 | * time. Order of access is not guaranteed, nor is a memory barrier | |
375 | * performed afterwards. | |
376 | * | |
377 | * Warning: Do not use this helper unless your driver has checked that the CPU | |
378 | * instruction is supported on the platform. | |
379 | */ | |
0888e103 | 380 | static inline void iosubmit_cmds512(void __iomem *dst, const void *src, |
232bb01b DJ |
381 | size_t count) |
382 | { | |
232bb01b DJ |
383 | const u8 *from = src; |
384 | const u8 *end = from + count * 64; | |
385 | ||
386 | while (from < end) { | |
0888e103 | 387 | movdir64b(dst, from); |
232bb01b DJ |
388 | from += 64; |
389 | } | |
390 | } | |
391 | ||
1965aae3 | 392 | #endif /* _ASM_X86_IO_H */ |