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 build_mmio_read(readb, "b", unsigned char, "=q", :"memory") 58 build_mmio_read(readw, "w", unsigned short, "=r", :"memory") 59 build_mmio_read(readl, "l", unsigned int, "=r", :"memory") 60 61 build_mmio_read(__readb, "b", unsigned char, "=q", ) 62 build_mmio_read(__readw, "w", unsigned short, "=r", ) 63 build_mmio_read(__readl, "l", unsigned int, "=r", ) 64 65 build_mmio_write(writeb, "b", unsigned char, "q", :"memory") 66 build_mmio_write(writew, "w", unsigned short, "r", :"memory") 67 build_mmio_write(writel, "l", unsigned int, "r", :"memory") 68 69 build_mmio_write(__writeb, "b", unsigned char, "q", ) 70 build_mmio_write(__writew, "w", unsigned short, "r", ) 71 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 #define mmiowb() barrier() 94 95 #ifdef CONFIG_X86_64 96 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", ) 101 102 #define readq_relaxed(a) __readq(a) 103 #define writeq_relaxed(v, a) __writeq(v, a) 104 105 #define __raw_readq __readq 106 #define __raw_writeq __writeq 107 108 /* Let people know that we have them */ 109 #define readq readq 110 #define writeq writeq 111 112 #endif 113 114 #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); 117 118 /** 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 } 135 #define virt_to_phys virt_to_phys 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 } 154 #define phys_to_virt phys_to_virt 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. 163 * However, we truncate the address to unsigned int to avoid undesirable 164 * promitions in legacy drivers. 165 */ 166 static inline unsigned int isa_virt_to_bus(volatile void *address) 167 { 168 return (unsigned int)virt_to_phys(address); 169 } 170 #define isa_page_to_bus(page) ((unsigned int)page_to_phys(page)) 171 #define isa_bus_to_virt phys_to_virt 172 173 /* 174 * However PCI ones are not necessarily 1:1 and therefore these interfaces 175 * are forbidden in portable PCI drivers. 176 * 177 * Allow them on x86 for legacy drivers, though. 178 */ 179 #define virt_to_bus virt_to_phys 180 #define bus_to_virt phys_to_virt 181 182 /* 183 * The default ioremap() behavior is non-cached; if you need something 184 * else, you probably want one of the following. 185 */ 186 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); 187 #define ioremap_nocache ioremap_nocache 188 extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size); 189 #define ioremap_uc ioremap_uc 190 191 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size); 192 #define ioremap_cache ioremap_cache 193 extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val); 194 #define ioremap_prot ioremap_prot 195 196 /** 197 * ioremap - map bus memory into CPU space 198 * @offset: bus address of the memory 199 * @size: size of the resource to map 200 * 201 * ioremap performs a platform specific sequence of operations to 202 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 203 * writew/writel functions and the other mmio helpers. The returned 204 * address is not guaranteed to be usable directly as a virtual 205 * address. 206 * 207 * If the area you are trying to map is a PCI BAR you should have a 208 * look at pci_iomap(). 209 */ 210 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) 211 { 212 return ioremap_nocache(offset, size); 213 } 214 #define ioremap ioremap 215 216 extern void iounmap(volatile void __iomem *addr); 217 #define iounmap iounmap 218 219 extern void set_iounmap_nonlazy(void); 220 221 #ifdef __KERNEL__ 222 223 #include <asm-generic/iomap.h> 224 225 /* 226 * ISA space is 'always mapped' on a typical x86 system, no need to 227 * explicitly ioremap() it. The fact that the ISA IO space is mapped 228 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 229 * are physical addresses. The following constant pointer can be 230 * used as the IO-area pointer (it can be iounmapped as well, so the 231 * analogy with PCI is quite large): 232 */ 233 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) 234 235 #endif /* __KERNEL__ */ 236 237 extern void native_io_delay(void); 238 239 extern int io_delay_type; 240 extern void io_delay_init(void); 241 242 #if defined(CONFIG_PARAVIRT) 243 #include <asm/paravirt.h> 244 #else 245 246 static inline void slow_down_io(void) 247 { 248 native_io_delay(); 249 #ifdef REALLY_SLOW_IO 250 native_io_delay(); 251 native_io_delay(); 252 native_io_delay(); 253 #endif 254 } 255 256 #endif 257 258 #ifdef CONFIG_AMD_MEM_ENCRYPT 259 #include <linux/jump_label.h> 260 261 extern struct static_key_false sev_enable_key; 262 static inline bool sev_key_active(void) 263 { 264 return static_branch_unlikely(&sev_enable_key); 265 } 266 267 #else /* !CONFIG_AMD_MEM_ENCRYPT */ 268 269 static inline bool sev_key_active(void) { return false; } 270 271 #endif /* CONFIG_AMD_MEM_ENCRYPT */ 272 273 #define BUILDIO(bwl, bw, type) \ 274 static inline void out##bwl(unsigned type value, int port) \ 275 { \ 276 asm volatile("out" #bwl " %" #bw "0, %w1" \ 277 : : "a"(value), "Nd"(port)); \ 278 } \ 279 \ 280 static inline unsigned type in##bwl(int port) \ 281 { \ 282 unsigned type value; \ 283 asm volatile("in" #bwl " %w1, %" #bw "0" \ 284 : "=a"(value) : "Nd"(port)); \ 285 return value; \ 286 } \ 287 \ 288 static inline void out##bwl##_p(unsigned type value, int port) \ 289 { \ 290 out##bwl(value, port); \ 291 slow_down_io(); \ 292 } \ 293 \ 294 static inline unsigned type in##bwl##_p(int port) \ 295 { \ 296 unsigned type value = in##bwl(port); \ 297 slow_down_io(); \ 298 return value; \ 299 } \ 300 \ 301 static inline void outs##bwl(int port, const void *addr, unsigned long count) \ 302 { \ 303 if (sev_key_active()) { \ 304 unsigned type *value = (unsigned type *)addr; \ 305 while (count) { \ 306 out##bwl(*value, port); \ 307 value++; \ 308 count--; \ 309 } \ 310 } else { \ 311 asm volatile("rep; outs" #bwl \ 312 : "+S"(addr), "+c"(count) \ 313 : "d"(port) : "memory"); \ 314 } \ 315 } \ 316 \ 317 static inline void ins##bwl(int port, void *addr, unsigned long count) \ 318 { \ 319 if (sev_key_active()) { \ 320 unsigned type *value = (unsigned type *)addr; \ 321 while (count) { \ 322 *value = in##bwl(port); \ 323 value++; \ 324 count--; \ 325 } \ 326 } else { \ 327 asm volatile("rep; ins" #bwl \ 328 : "+D"(addr), "+c"(count) \ 329 : "d"(port) : "memory"); \ 330 } \ 331 } 332 333 BUILDIO(b, b, char) 334 BUILDIO(w, w, short) 335 BUILDIO(l, , int) 336 337 #define inb inb 338 #define inw inw 339 #define inl inl 340 #define inb_p inb_p 341 #define inw_p inw_p 342 #define inl_p inl_p 343 #define insb insb 344 #define insw insw 345 #define insl insl 346 347 #define outb outb 348 #define outw outw 349 #define outl outl 350 #define outb_p outb_p 351 #define outw_p outw_p 352 #define outl_p outl_p 353 #define outsb outsb 354 #define outsw outsw 355 #define outsl outsl 356 357 extern void *xlate_dev_mem_ptr(phys_addr_t phys); 358 extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr); 359 360 #define xlate_dev_mem_ptr xlate_dev_mem_ptr 361 #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr 362 363 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, 364 enum page_cache_mode pcm); 365 extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); 366 #define ioremap_wc ioremap_wc 367 extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size); 368 #define ioremap_wt ioremap_wt 369 370 extern bool is_early_ioremap_ptep(pte_t *ptep); 371 372 #ifdef CONFIG_XEN 373 #include <xen/xen.h> 374 struct bio_vec; 375 376 extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 377 const struct bio_vec *vec2); 378 379 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 380 (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ 381 (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) 382 #endif /* CONFIG_XEN */ 383 384 #define IO_SPACE_LIMIT 0xffff 385 386 #include <asm-generic/io.h> 387 #undef PCI_IOBASE 388 389 #ifdef CONFIG_MTRR 390 extern int __must_check arch_phys_wc_index(int handle); 391 #define arch_phys_wc_index arch_phys_wc_index 392 393 extern int __must_check arch_phys_wc_add(unsigned long base, 394 unsigned long size); 395 extern void arch_phys_wc_del(int handle); 396 #define arch_phys_wc_add arch_phys_wc_add 397 #endif 398 399 #ifdef CONFIG_X86_PAT 400 extern int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size); 401 extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size); 402 #define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc 403 #endif 404 405 extern bool arch_memremap_can_ram_remap(resource_size_t offset, 406 unsigned long size, 407 unsigned long flags); 408 #define arch_memremap_can_ram_remap arch_memremap_can_ram_remap 409 410 extern bool phys_mem_access_encrypted(unsigned long phys_addr, 411 unsigned long size); 412 413 #endif /* _ASM_X86_IO_H */ 414