1 #ifndef _ASM_X86_IO_H 2 #define _ASM_X86_IO_H 3 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 37 #define ARCH_HAS_IOREMAP_WC 38 #define ARCH_HAS_IOREMAP_WT 39 40 #include <linux/string.h> 41 #include <linux/compiler.h> 42 #include <asm/page.h> 43 #include <asm/early_ioremap.h> 44 #include <asm/pgtable_types.h> 45 46 #define build_mmio_read(name, size, type, reg, barrier) \ 47 static inline type name(const volatile void __iomem *addr) \ 48 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \ 49 :"m" (*(volatile type __force *)addr) barrier); return ret; } 50 51 #define build_mmio_write(name, size, type, reg, barrier) \ 52 static inline void name(type val, volatile void __iomem *addr) \ 53 { asm volatile("mov" size " %0,%1": :reg (val), \ 54 "m" (*(volatile type __force *)addr) barrier); } 55 56 build_mmio_read(readb, "b", unsigned char, "=q", :"memory") 57 build_mmio_read(readw, "w", unsigned short, "=r", :"memory") 58 build_mmio_read(readl, "l", unsigned int, "=r", :"memory") 59 60 build_mmio_read(__readb, "b", unsigned char, "=q", ) 61 build_mmio_read(__readw, "w", unsigned short, "=r", ) 62 build_mmio_read(__readl, "l", unsigned int, "=r", ) 63 64 build_mmio_write(writeb, "b", unsigned char, "q", :"memory") 65 build_mmio_write(writew, "w", unsigned short, "r", :"memory") 66 build_mmio_write(writel, "l", unsigned int, "r", :"memory") 67 68 build_mmio_write(__writeb, "b", unsigned char, "q", ) 69 build_mmio_write(__writew, "w", unsigned short, "r", ) 70 build_mmio_write(__writel, "l", unsigned int, "r", ) 71 72 #define readb_relaxed(a) __readb(a) 73 #define readw_relaxed(a) __readw(a) 74 #define readl_relaxed(a) __readl(a) 75 #define __raw_readb __readb 76 #define __raw_readw __readw 77 #define __raw_readl __readl 78 79 #define writeb_relaxed(v, a) __writeb(v, a) 80 #define writew_relaxed(v, a) __writew(v, a) 81 #define writel_relaxed(v, a) __writel(v, a) 82 #define __raw_writeb __writeb 83 #define __raw_writew __writew 84 #define __raw_writel __writel 85 86 #define mmiowb() barrier() 87 88 #ifdef CONFIG_X86_64 89 90 build_mmio_read(readq, "q", unsigned long, "=r", :"memory") 91 build_mmio_write(writeq, "q", unsigned long, "r", :"memory") 92 93 #define readq_relaxed(a) readq(a) 94 #define writeq_relaxed(v, a) writeq(v, a) 95 96 #define __raw_readq(a) readq(a) 97 #define __raw_writeq(val, addr) writeq(val, addr) 98 99 /* Let people know that we have them */ 100 #define readq readq 101 #define writeq writeq 102 103 #endif 104 105 /** 106 * virt_to_phys - map virtual addresses to physical 107 * @address: address to remap 108 * 109 * The returned physical address is the physical (CPU) mapping for 110 * the memory address given. It is only valid to use this function on 111 * addresses directly mapped or allocated via kmalloc. 112 * 113 * This function does not give bus mappings for DMA transfers. In 114 * almost all conceivable cases a device driver should not be using 115 * this function 116 */ 117 118 static inline phys_addr_t virt_to_phys(volatile void *address) 119 { 120 return __pa(address); 121 } 122 123 /** 124 * phys_to_virt - map physical address to virtual 125 * @address: address to remap 126 * 127 * The returned virtual address is a current CPU mapping for 128 * the memory address given. It is only valid to use this function on 129 * addresses that have a kernel mapping 130 * 131 * This function does not handle bus mappings for DMA transfers. In 132 * almost all conceivable cases a device driver should not be using 133 * this function 134 */ 135 136 static inline void *phys_to_virt(phys_addr_t address) 137 { 138 return __va(address); 139 } 140 141 /* 142 * Change "struct page" to physical address. 143 */ 144 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) 145 146 /* 147 * ISA I/O bus memory addresses are 1:1 with the physical address. 148 * However, we truncate the address to unsigned int to avoid undesirable 149 * promitions in legacy drivers. 150 */ 151 static inline unsigned int isa_virt_to_bus(volatile void *address) 152 { 153 return (unsigned int)virt_to_phys(address); 154 } 155 #define isa_page_to_bus(page) ((unsigned int)page_to_phys(page)) 156 #define isa_bus_to_virt phys_to_virt 157 158 /* 159 * However PCI ones are not necessarily 1:1 and therefore these interfaces 160 * are forbidden in portable PCI drivers. 161 * 162 * Allow them on x86 for legacy drivers, though. 163 */ 164 #define virt_to_bus virt_to_phys 165 #define bus_to_virt phys_to_virt 166 167 /* 168 * The default ioremap() behavior is non-cached; if you need something 169 * else, you probably want one of the following. 170 */ 171 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); 172 extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size); 173 #define ioremap_uc ioremap_uc 174 175 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, unsigned long prot_val); 177 178 /** 179 * ioremap - map bus memory into CPU space 180 * @offset: bus address of the memory 181 * @size: size of the resource to map 182 * 183 * ioremap performs a platform specific sequence of operations to 184 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 185 * writew/writel functions and the other mmio helpers. The returned 186 * address is not guaranteed to be usable directly as a virtual 187 * address. 188 * 189 * If the area you are trying to map is a PCI BAR you should have a 190 * look at pci_iomap(). 191 */ 192 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) 193 { 194 return ioremap_nocache(offset, size); 195 } 196 197 extern void iounmap(volatile void __iomem *addr); 198 199 extern void set_iounmap_nonlazy(void); 200 201 #ifdef __KERNEL__ 202 203 #include <asm-generic/iomap.h> 204 205 /* 206 * Convert a virtual cached pointer to an uncached pointer 207 */ 208 #define xlate_dev_kmem_ptr(p) p 209 210 /** 211 * memset_io Set a range of I/O memory to a constant value 212 * @addr: The beginning of the I/O-memory range to set 213 * @val: The value to set the memory to 214 * @count: The number of bytes to set 215 * 216 * Set a range of I/O memory to a given value. 217 */ 218 static inline void 219 memset_io(volatile void __iomem *addr, unsigned char val, size_t count) 220 { 221 memset((void __force *)addr, val, count); 222 } 223 224 /** 225 * memcpy_fromio Copy a block of data from I/O memory 226 * @dst: The (RAM) destination for the copy 227 * @src: The (I/O memory) source for the data 228 * @count: The number of bytes to copy 229 * 230 * Copy a block of data from I/O memory. 231 */ 232 static inline void 233 memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count) 234 { 235 memcpy(dst, (const void __force *)src, count); 236 } 237 238 /** 239 * memcpy_toio Copy a block of data into I/O memory 240 * @dst: The (I/O memory) destination for the copy 241 * @src: The (RAM) source for the data 242 * @count: The number of bytes to copy 243 * 244 * Copy a block of data to I/O memory. 245 */ 246 static inline void 247 memcpy_toio(volatile void __iomem *dst, const void *src, size_t count) 248 { 249 memcpy((void __force *)dst, src, count); 250 } 251 252 /* 253 * ISA space is 'always mapped' on a typical x86 system, no need to 254 * explicitly ioremap() it. The fact that the ISA IO space is mapped 255 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 256 * are physical addresses. The following constant pointer can be 257 * used as the IO-area pointer (it can be iounmapped as well, so the 258 * analogy with PCI is quite large): 259 */ 260 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) 261 262 /* 263 * Cache management 264 * 265 * This needed for two cases 266 * 1. Out of order aware processors 267 * 2. Accidentally out of order processors (PPro errata #51) 268 */ 269 270 static inline void flush_write_buffers(void) 271 { 272 #if defined(CONFIG_X86_PPRO_FENCE) 273 asm volatile("lock; addl $0,0(%%esp)": : :"memory"); 274 #endif 275 } 276 277 #endif /* __KERNEL__ */ 278 279 extern void native_io_delay(void); 280 281 extern int io_delay_type; 282 extern void io_delay_init(void); 283 284 #if defined(CONFIG_PARAVIRT) 285 #include <asm/paravirt.h> 286 #else 287 288 static inline void slow_down_io(void) 289 { 290 native_io_delay(); 291 #ifdef REALLY_SLOW_IO 292 native_io_delay(); 293 native_io_delay(); 294 native_io_delay(); 295 #endif 296 } 297 298 #endif 299 300 #define BUILDIO(bwl, bw, type) \ 301 static inline void out##bwl(unsigned type value, int port) \ 302 { \ 303 asm volatile("out" #bwl " %" #bw "0, %w1" \ 304 : : "a"(value), "Nd"(port)); \ 305 } \ 306 \ 307 static inline unsigned type in##bwl(int port) \ 308 { \ 309 unsigned type value; \ 310 asm volatile("in" #bwl " %w1, %" #bw "0" \ 311 : "=a"(value) : "Nd"(port)); \ 312 return value; \ 313 } \ 314 \ 315 static inline void out##bwl##_p(unsigned type value, int port) \ 316 { \ 317 out##bwl(value, port); \ 318 slow_down_io(); \ 319 } \ 320 \ 321 static inline unsigned type in##bwl##_p(int port) \ 322 { \ 323 unsigned type value = in##bwl(port); \ 324 slow_down_io(); \ 325 return value; \ 326 } \ 327 \ 328 static inline void outs##bwl(int port, const void *addr, unsigned long count) \ 329 { \ 330 asm volatile("rep; outs" #bwl \ 331 : "+S"(addr), "+c"(count) : "d"(port) : "memory"); \ 332 } \ 333 \ 334 static inline void ins##bwl(int port, void *addr, unsigned long count) \ 335 { \ 336 asm volatile("rep; ins" #bwl \ 337 : "+D"(addr), "+c"(count) : "d"(port) : "memory"); \ 338 } 339 340 BUILDIO(b, b, char) 341 BUILDIO(w, w, short) 342 BUILDIO(l, , int) 343 344 extern void *xlate_dev_mem_ptr(phys_addr_t phys); 345 extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr); 346 347 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, 348 enum page_cache_mode pcm); 349 extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); 350 extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size); 351 352 extern bool is_early_ioremap_ptep(pte_t *ptep); 353 354 #ifdef CONFIG_XEN 355 #include <xen/xen.h> 356 struct bio_vec; 357 358 extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 359 const struct bio_vec *vec2); 360 361 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 362 (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ 363 (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) 364 #endif /* CONFIG_XEN */ 365 366 #define IO_SPACE_LIMIT 0xffff 367 368 #ifdef CONFIG_MTRR 369 extern int __must_check arch_phys_wc_index(int handle); 370 #define arch_phys_wc_index arch_phys_wc_index 371 372 extern int __must_check arch_phys_wc_add(unsigned long base, 373 unsigned long size); 374 extern void arch_phys_wc_del(int handle); 375 #define arch_phys_wc_add arch_phys_wc_add 376 #endif 377 378 #ifdef CONFIG_X86_PAT 379 extern int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size); 380 extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size); 381 #define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc 382 #endif 383 384 #endif /* _ASM_X86_IO_H */ 385