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 #ifdef CONFIG_X86_64 94 95 build_mmio_read(readq, "q", u64, "=r", :"memory") 96 build_mmio_read(__readq, "q", u64, "=r", ) 97 build_mmio_write(writeq, "q", u64, "r", :"memory") 98 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 static inline phys_addr_t virt_to_phys(volatile void *address) 130 { 131 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 static inline void *phys_to_virt(phys_addr_t address) 149 { 150 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_page_to_bus(page) ((unsigned int)page_to_phys(page)) 169 #define isa_bus_to_virt phys_to_virt 170 171 /* 172 * However PCI ones are not necessarily 1:1 and therefore these interfaces 173 * are forbidden in portable PCI drivers. 174 * 175 * Allow them on x86 for legacy drivers, though. 176 */ 177 #define virt_to_bus virt_to_phys 178 #define bus_to_virt phys_to_virt 179 180 /* 181 * The default ioremap() behavior is non-cached; if you need something 182 * else, you probably want one of the following. 183 */ 184 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); 185 #define ioremap_nocache ioremap_nocache 186 extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size); 187 #define ioremap_uc ioremap_uc 188 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size); 189 #define ioremap_cache ioremap_cache 190 extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val); 191 #define ioremap_prot ioremap_prot 192 extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size); 193 #define ioremap_encrypted ioremap_encrypted 194 195 /** 196 * ioremap - map bus memory into CPU space 197 * @offset: bus address of the memory 198 * @size: size of the resource to map 199 * 200 * ioremap performs a platform specific sequence of operations to 201 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 202 * writew/writel functions and the other mmio helpers. The returned 203 * address is not guaranteed to be usable directly as a virtual 204 * address. 205 * 206 * If the area you are trying to map is a PCI BAR you should have a 207 * look at pci_iomap(). 208 */ 209 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) 210 { 211 return ioremap_nocache(offset, size); 212 } 213 #define ioremap ioremap 214 215 extern void iounmap(volatile void __iomem *addr); 216 #define iounmap iounmap 217 218 extern void set_iounmap_nonlazy(void); 219 220 #ifdef __KERNEL__ 221 222 void memcpy_fromio(void *, const volatile void __iomem *, size_t); 223 void memcpy_toio(volatile void __iomem *, const void *, size_t); 224 void memset_io(volatile void __iomem *, int, size_t); 225 226 #define memcpy_fromio memcpy_fromio 227 #define memcpy_toio memcpy_toio 228 #define memset_io memset_io 229 230 #include <asm-generic/iomap.h> 231 232 /* 233 * ISA space is 'always mapped' on a typical x86 system, no need to 234 * explicitly ioremap() it. The fact that the ISA IO space is mapped 235 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 236 * are physical addresses. The following constant pointer can be 237 * used as the IO-area pointer (it can be iounmapped as well, so the 238 * analogy with PCI is quite large): 239 */ 240 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) 241 242 #endif /* __KERNEL__ */ 243 244 extern void native_io_delay(void); 245 246 extern int io_delay_type; 247 extern void io_delay_init(void); 248 249 #if defined(CONFIG_PARAVIRT) 250 #include <asm/paravirt.h> 251 #else 252 253 static inline void slow_down_io(void) 254 { 255 native_io_delay(); 256 #ifdef REALLY_SLOW_IO 257 native_io_delay(); 258 native_io_delay(); 259 native_io_delay(); 260 #endif 261 } 262 263 #endif 264 265 #ifdef CONFIG_AMD_MEM_ENCRYPT 266 #include <linux/jump_label.h> 267 268 extern struct static_key_false sev_enable_key; 269 static inline bool sev_key_active(void) 270 { 271 return static_branch_unlikely(&sev_enable_key); 272 } 273 274 #else /* !CONFIG_AMD_MEM_ENCRYPT */ 275 276 static inline bool sev_key_active(void) { return false; } 277 278 #endif /* CONFIG_AMD_MEM_ENCRYPT */ 279 280 #define BUILDIO(bwl, bw, type) \ 281 static inline void out##bwl(unsigned type value, int port) \ 282 { \ 283 asm volatile("out" #bwl " %" #bw "0, %w1" \ 284 : : "a"(value), "Nd"(port)); \ 285 } \ 286 \ 287 static inline unsigned type in##bwl(int port) \ 288 { \ 289 unsigned type value; \ 290 asm volatile("in" #bwl " %w1, %" #bw "0" \ 291 : "=a"(value) : "Nd"(port)); \ 292 return value; \ 293 } \ 294 \ 295 static inline void out##bwl##_p(unsigned type value, int port) \ 296 { \ 297 out##bwl(value, port); \ 298 slow_down_io(); \ 299 } \ 300 \ 301 static inline unsigned type in##bwl##_p(int port) \ 302 { \ 303 unsigned type value = in##bwl(port); \ 304 slow_down_io(); \ 305 return value; \ 306 } \ 307 \ 308 static inline void outs##bwl(int port, const void *addr, unsigned long count) \ 309 { \ 310 if (sev_key_active()) { \ 311 unsigned type *value = (unsigned type *)addr; \ 312 while (count) { \ 313 out##bwl(*value, port); \ 314 value++; \ 315 count--; \ 316 } \ 317 } else { \ 318 asm volatile("rep; outs" #bwl \ 319 : "+S"(addr), "+c"(count) \ 320 : "d"(port) : "memory"); \ 321 } \ 322 } \ 323 \ 324 static inline void ins##bwl(int port, void *addr, unsigned long count) \ 325 { \ 326 if (sev_key_active()) { \ 327 unsigned type *value = (unsigned type *)addr; \ 328 while (count) { \ 329 *value = in##bwl(port); \ 330 value++; \ 331 count--; \ 332 } \ 333 } else { \ 334 asm volatile("rep; ins" #bwl \ 335 : "+D"(addr), "+c"(count) \ 336 : "d"(port) : "memory"); \ 337 } \ 338 } 339 340 BUILDIO(b, b, char) 341 BUILDIO(w, w, short) 342 BUILDIO(l, , int) 343 344 #define inb inb 345 #define inw inw 346 #define inl inl 347 #define inb_p inb_p 348 #define inw_p inw_p 349 #define inl_p inl_p 350 #define insb insb 351 #define insw insw 352 #define insl insl 353 354 #define outb outb 355 #define outw outw 356 #define outl outl 357 #define outb_p outb_p 358 #define outw_p outw_p 359 #define outl_p outl_p 360 #define outsb outsb 361 #define outsw outsw 362 #define outsl outsl 363 364 extern void *xlate_dev_mem_ptr(phys_addr_t phys); 365 extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr); 366 367 #define xlate_dev_mem_ptr xlate_dev_mem_ptr 368 #define unxlate_dev_mem_ptr unxlate_dev_mem_ptr 369 370 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, 371 enum page_cache_mode pcm); 372 extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); 373 #define ioremap_wc ioremap_wc 374 extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size); 375 #define ioremap_wt ioremap_wt 376 377 extern bool is_early_ioremap_ptep(pte_t *ptep); 378 379 #define IO_SPACE_LIMIT 0xffff 380 381 #include <asm-generic/io.h> 382 #undef PCI_IOBASE 383 384 #ifdef CONFIG_MTRR 385 extern int __must_check arch_phys_wc_index(int handle); 386 #define arch_phys_wc_index arch_phys_wc_index 387 388 extern int __must_check arch_phys_wc_add(unsigned long base, 389 unsigned long size); 390 extern void arch_phys_wc_del(int handle); 391 #define arch_phys_wc_add arch_phys_wc_add 392 #endif 393 394 #ifdef CONFIG_X86_PAT 395 extern int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size); 396 extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size); 397 #define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc 398 #endif 399 400 extern bool arch_memremap_can_ram_remap(resource_size_t offset, 401 unsigned long size, 402 unsigned long flags); 403 #define arch_memremap_can_ram_remap arch_memremap_can_ram_remap 404 405 extern bool phys_mem_access_encrypted(unsigned long phys_addr, 406 unsigned long size); 407 408 #endif /* _ASM_X86_IO_H */ 409