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1 : : /* SPDX-License-Identifier: GPL-2.0 */
2 : : #ifndef _ASM_X86_IO_H
3 : : #define _ASM_X86_IO_H
4 : :
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 : :
38 : : #define ARCH_HAS_IOREMAP_WC
39 : : #define ARCH_HAS_IOREMAP_WT
40 : :
41 : : #include <linux/string.h>
42 : : #include <linux/compiler.h>
43 : : #include <asm/page.h>
44 : : #include <asm/early_ioremap.h>
45 : : #include <asm/pgtable_types.h>
46 : :
47 : : #define build_mmio_read(name, size, type, reg, barrier) \
48 : : static inline type name(const volatile void __iomem *addr) \
49 : : { type ret; asm volatile("mov" size " %1,%0":reg (ret) \
50 : : :"m" (*(volatile type __force *)addr) barrier); return ret; }
51 : :
52 : : #define build_mmio_write(name, size, type, reg, barrier) \
53 : : static inline void name(type val, volatile void __iomem *addr) \
54 : : { asm volatile("mov" size " %0,%1": :reg (val), \
55 : : "m" (*(volatile type __force *)addr) barrier); }
56 : :
57 [ - - # # : 522 : build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
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58 [ - + - + : 33 : build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
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59 [ + + - + : 568 : build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
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60 : :
61 : 0 : build_mmio_read(__readb, "b", unsigned char, "=q", )
62 [ # # ]: 0 : build_mmio_read(__readw, "w", unsigned short, "=r", )
63 : 0 : build_mmio_read(__readl, "l", unsigned int, "=r", )
64 : :
65 : 843 : build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
66 : 30 : build_mmio_write(writew, "w", unsigned short, "r", :"memory")
67 : 769 : build_mmio_write(writel, "l", unsigned int, "r", :"memory")
68 : :
69 : 0 : build_mmio_write(__writeb, "b", unsigned char, "q", )
70 : 0 : build_mmio_write(__writew, "w", unsigned short, "r", )
71 : 0 : build_mmio_write(__writel, "l", unsigned int, "r", )
72 : :
73 : : #define readb readb
74 : : #define readw readw
75 : : #define readl readl
76 : : #define readb_relaxed(a) __readb(a)
77 : : #define readw_relaxed(a) __readw(a)
78 : : #define readl_relaxed(a) __readl(a)
79 : : #define __raw_readb __readb
80 : : #define __raw_readw __readw
81 : : #define __raw_readl __readl
82 : :
83 : : #define writeb writeb
84 : : #define writew writew
85 : : #define writel writel
86 : : #define writeb_relaxed(v, a) __writeb(v, a)
87 : : #define writew_relaxed(v, a) __writew(v, a)
88 : : #define writel_relaxed(v, a) __writel(v, a)
89 : : #define __raw_writeb __writeb
90 : : #define __raw_writew __writew
91 : : #define __raw_writel __writel
92 : :
93 : : #ifdef CONFIG_X86_64
94 : :
95 [ - + - + : 3127 : build_mmio_read(readq, "q", u64, "=r", :"memory")
- - - - -
- - - -
- ]
96 : 0 : build_mmio_read(__readq, "q", u64, "=r", )
97 : 3404 : build_mmio_write(writeq, "q", u64, "r", :"memory")
98 : 0 : build_mmio_write(__writeq, "q", u64, "r", )
99 : :
100 : : #define readq_relaxed(a) __readq(a)
101 : : #define writeq_relaxed(v, a) __writeq(v, a)
102 : :
103 : : #define __raw_readq __readq
104 : : #define __raw_writeq __writeq
105 : :
106 : : /* Let people know that we have them */
107 : : #define readq readq
108 : : #define writeq writeq
109 : :
110 : : #endif
111 : :
112 : : #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
113 : : extern int valid_phys_addr_range(phys_addr_t addr, size_t size);
114 : : extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
115 : :
116 : : /**
117 : : * virt_to_phys - map virtual addresses to physical
118 : : * @address: address to remap
119 : : *
120 : : * The returned physical address is the physical (CPU) mapping for
121 : : * the memory address given. It is only valid to use this function on
122 : : * addresses directly mapped or allocated via kmalloc.
123 : : *
124 : : * This function does not give bus mappings for DMA transfers. In
125 : : * almost all conceivable cases a device driver should not be using
126 : : * this function
127 : : */
128 : :
129 : 57 : static inline phys_addr_t virt_to_phys(volatile void *address)
130 : : {
131 [ + - # # : 57 : return __pa(address);
# # # # #
# # # ]
132 : : }
133 : : #define virt_to_phys virt_to_phys
134 : :
135 : : /**
136 : : * phys_to_virt - map physical address to virtual
137 : : * @address: address to remap
138 : : *
139 : : * The returned virtual address is a current CPU mapping for
140 : : * the memory address given. It is only valid to use this function on
141 : : * addresses that have a kernel mapping
142 : : *
143 : : * This function does not handle bus mappings for DMA transfers. In
144 : : * almost all conceivable cases a device driver should not be using
145 : : * this function
146 : : */
147 : :
148 : 3768 : static inline void *phys_to_virt(phys_addr_t address)
149 : : {
150 [ + + - + : 3765 : return __va(address);
# # # # ]
151 : : }
152 : : #define phys_to_virt phys_to_virt
153 : :
154 : : /*
155 : : * Change "struct page" to physical address.
156 : : */
157 : : #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
158 : :
159 : : /*
160 : : * ISA I/O bus memory addresses are 1:1 with the physical address.
161 : : * However, we truncate the address to unsigned int to avoid undesirable
162 : : * promitions in legacy drivers.
163 : : */
164 : : static inline unsigned int isa_virt_to_bus(volatile void *address)
165 : : {
166 : : return (unsigned int)virt_to_phys(address);
167 : : }
168 : : #define isa_bus_to_virt phys_to_virt
169 : :
170 : : /*
171 : : * However PCI ones are not necessarily 1:1 and therefore these interfaces
172 : : * are forbidden in portable PCI drivers.
173 : : *
174 : : * Allow them on x86 for legacy drivers, though.
175 : : */
176 : : #define virt_to_bus virt_to_phys
177 : : #define bus_to_virt phys_to_virt
178 : :
179 : : /*
180 : : * The default ioremap() behavior is non-cached; if you need something
181 : : * else, you probably want one of the following.
182 : : */
183 : : extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size);
184 : : #define ioremap_uc ioremap_uc
185 : : extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
186 : : #define ioremap_cache ioremap_cache
187 : : extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val);
188 : : #define ioremap_prot ioremap_prot
189 : : extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size);
190 : : #define ioremap_encrypted ioremap_encrypted
191 : :
192 : : /**
193 : : * ioremap - map bus memory into CPU space
194 : : * @offset: bus address of the memory
195 : : * @size: size of the resource to map
196 : : *
197 : : * ioremap performs a platform specific sequence of operations to
198 : : * make bus memory CPU accessible via the readb/readw/readl/writeb/
199 : : * writew/writel functions and the other mmio helpers. The returned
200 : : * address is not guaranteed to be usable directly as a virtual
201 : : * address.
202 : : *
203 : : * If the area you are trying to map is a PCI BAR you should have a
204 : : * look at pci_iomap().
205 : : */
206 : : void __iomem *ioremap(resource_size_t offset, unsigned long size);
207 : : #define ioremap ioremap
208 : :
209 : : extern void iounmap(volatile void __iomem *addr);
210 : : #define iounmap iounmap
211 : :
212 : : extern void set_iounmap_nonlazy(void);
213 : :
214 : : #ifdef __KERNEL__
215 : :
216 : : void memcpy_fromio(void *, const volatile void __iomem *, size_t);
217 : : void memcpy_toio(volatile void __iomem *, const void *, size_t);
218 : : void memset_io(volatile void __iomem *, int, size_t);
219 : :
220 : : #define memcpy_fromio memcpy_fromio
221 : : #define memcpy_toio memcpy_toio
222 : : #define memset_io memset_io
223 : :
224 : : #include <asm-generic/iomap.h>
225 : :
226 : : /*
227 : : * ISA space is 'always mapped' on a typical x86 system, no need to
228 : : * explicitly ioremap() it. The fact that the ISA IO space is mapped
229 : : * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
230 : : * are physical addresses. The following constant pointer can be
231 : : * used as the IO-area pointer (it can be iounmapped as well, so the
232 : : * analogy with PCI is quite large):
233 : : */
234 : : #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
235 : :
236 : : #endif /* __KERNEL__ */
237 : :
238 : : extern void native_io_delay(void);
239 : :
240 : : extern int io_delay_type;
241 : : extern void io_delay_init(void);
242 : :
243 : : #if defined(CONFIG_PARAVIRT)
244 : : #include <asm/paravirt.h>
245 : : #else
246 : :
247 : : static inline void slow_down_io(void)
248 : : {
249 : : native_io_delay();
250 : : #ifdef REALLY_SLOW_IO
251 : : native_io_delay();
252 : : native_io_delay();
253 : : native_io_delay();
254 : : #endif
255 : : }
256 : :
257 : : #endif
258 : :
259 : : #ifdef CONFIG_AMD_MEM_ENCRYPT
260 : : #include <linux/jump_label.h>
261 : :
262 : : extern struct static_key_false sev_enable_key;
263 : : static inline bool sev_key_active(void)
264 : : {
265 : : return static_branch_unlikely(&sev_enable_key);
266 : : }
267 : :
268 : : #else /* !CONFIG_AMD_MEM_ENCRYPT */
269 : :
270 : 254 : static inline bool sev_key_active(void) { return false; }
271 : :
272 : : #endif /* CONFIG_AMD_MEM_ENCRYPT */
273 : :
274 : : #define BUILDIO(bwl, bw, type) \
275 : : static inline void out##bwl(unsigned type value, int port) \
276 : : { \
277 : : asm volatile("out" #bwl " %" #bw "0, %w1" \
278 : : : : "a"(value), "Nd"(port)); \
279 : : } \
280 : : \
281 : : static inline unsigned type in##bwl(int port) \
282 : : { \
283 : : unsigned type value; \
284 : : asm volatile("in" #bwl " %w1, %" #bw "0" \
285 : : : "=a"(value) : "Nd"(port)); \
286 : : return value; \
287 : : } \
288 : : \
289 : : static inline void out##bwl##_p(unsigned type value, int port) \
290 : : { \
291 : : out##bwl(value, port); \
292 : : slow_down_io(); \
293 : : } \
294 : : \
295 : : static inline unsigned type in##bwl##_p(int port) \
296 : : { \
297 : : unsigned type value = in##bwl(port); \
298 : : slow_down_io(); \
299 : : return value; \
300 : : } \
301 : : \
302 : : static inline void outs##bwl(int port, const void *addr, unsigned long count) \
303 : : { \
304 : : if (sev_key_active()) { \
305 : : unsigned type *value = (unsigned type *)addr; \
306 : : while (count) { \
307 : : out##bwl(*value, port); \
308 : : value++; \
309 : : count--; \
310 : : } \
311 : : } else { \
312 : : asm volatile("rep; outs" #bwl \
313 : : : "+S"(addr), "+c"(count) \
314 : : : "d"(port) : "memory"); \
315 : : } \
316 : : } \
317 : : \
318 : : static inline void ins##bwl(int port, void *addr, unsigned long count) \
319 : : { \
320 : : if (sev_key_active()) { \
321 : : unsigned type *value = (unsigned type *)addr; \
322 : : while (count) { \
323 : : *value = in##bwl(port); \
324 : : value++; \
325 : : count--; \
326 : : } \
327 : : } else { \
328 : : asm volatile("rep; ins" #bwl \
329 : : : "+D"(addr), "+c"(count) \
330 : : : "d"(port) : "memory"); \
331 : : } \
332 : : }
333 : :
334 [ + + - - : 293353 : BUILDIO(b, b, char)
- + + - -
+ + + - +
- + - + -
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- + ]
335 [ # # # # : 1229 : BUILDIO(w, w, short)
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# # # ]
336 [ + + # # ]: 7144 : BUILDIO(l, , int)
337 : :
338 : : #define inb inb
339 : : #define inw inw
340 : : #define inl inl
341 : : #define inb_p inb_p
342 : : #define inw_p inw_p
343 : : #define inl_p inl_p
344 : : #define insb insb
345 : : #define insw insw
346 : : #define insl insl
347 : :
348 : : #define outb outb
349 : : #define outw outw
350 : : #define outl outl
351 : : #define outb_p outb_p
352 : : #define outw_p outw_p
353 : : #define outl_p outl_p
354 : : #define outsb outsb
355 : : #define outsw outsw
356 : : #define outsl outsl
357 : :
358 : : extern void *xlate_dev_mem_ptr(phys_addr_t phys);
359 : : extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
360 : :
361 : : #define xlate_dev_mem_ptr xlate_dev_mem_ptr
362 : : #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
363 : :
364 : : extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
365 : : enum page_cache_mode pcm);
366 : : extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
367 : : #define ioremap_wc ioremap_wc
368 : : extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size);
369 : : #define ioremap_wt ioremap_wt
370 : :
371 : : extern bool is_early_ioremap_ptep(pte_t *ptep);
372 : :
373 : : #define IO_SPACE_LIMIT 0xffff
374 : :
375 : : #include <asm-generic/io.h>
376 : : #undef PCI_IOBASE
377 : :
378 : : #ifdef CONFIG_MTRR
379 : : extern int __must_check arch_phys_wc_index(int handle);
380 : : #define arch_phys_wc_index arch_phys_wc_index
381 : :
382 : : extern int __must_check arch_phys_wc_add(unsigned long base,
383 : : unsigned long size);
384 : : extern void arch_phys_wc_del(int handle);
385 : : #define arch_phys_wc_add arch_phys_wc_add
386 : : #endif
387 : :
388 : : #ifdef CONFIG_X86_PAT
389 : : extern int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size);
390 : : extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size);
391 : : #define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc
392 : : #endif
393 : :
394 : : extern bool arch_memremap_can_ram_remap(resource_size_t offset,
395 : : unsigned long size,
396 : : unsigned long flags);
397 : : #define arch_memremap_can_ram_remap arch_memremap_can_ram_remap
398 : :
399 : : extern bool phys_mem_access_encrypted(unsigned long phys_addr,
400 : : unsigned long size);
401 : :
402 : : /**
403 : : * iosubmit_cmds512 - copy data to single MMIO location, in 512-bit units
404 : : * @__dst: destination, in MMIO space (must be 512-bit aligned)
405 : : * @src: source
406 : : * @count: number of 512 bits quantities to submit
407 : : *
408 : : * Submit data from kernel space to MMIO space, in units of 512 bits at a
409 : : * time. Order of access is not guaranteed, nor is a memory barrier
410 : : * performed afterwards.
411 : : *
412 : : * Warning: Do not use this helper unless your driver has checked that the CPU
413 : : * instruction is supported on the platform.
414 : : */
415 : : static inline void iosubmit_cmds512(void __iomem *__dst, const void *src,
416 : : size_t count)
417 : : {
418 : : /*
419 : : * Note that this isn't an "on-stack copy", just definition of "dst"
420 : : * as a pointer to 64-bytes of stuff that is going to be overwritten.
421 : : * In the MOVDIR64B case that may be needed as you can use the
422 : : * MOVDIR64B instruction to copy arbitrary memory around. This trick
423 : : * lets the compiler know how much gets clobbered.
424 : : */
425 : : volatile struct { char _[64]; } *dst = __dst;
426 : : const u8 *from = src;
427 : : const u8 *end = from + count * 64;
428 : :
429 : : while (from < end) {
430 : : /* MOVDIR64B [rdx], rax */
431 : : asm volatile(".byte 0x66, 0x0f, 0x38, 0xf8, 0x02"
432 : : : "=m" (dst)
433 : : : "d" (from), "a" (dst));
434 : : from += 64;
435 : : }
436 : : }
437 : :
438 : : #endif /* _ASM_X86_IO_H */
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