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 39 #include <linux/string.h> 40 #include <linux/compiler.h> 41 #include <asm/page.h> 42 43 #define build_mmio_read(name, size, type, reg, barrier) \ 44 static inline type name(const volatile void __iomem *addr) \ 45 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \ 46 :"m" (*(volatile type __force *)addr) barrier); return ret; } 47 48 #define build_mmio_write(name, size, type, reg, barrier) \ 49 static inline void name(type val, volatile void __iomem *addr) \ 50 { asm volatile("mov" size " %0,%1": :reg (val), \ 51 "m" (*(volatile type __force *)addr) barrier); } 52 53 build_mmio_read(readb, "b", unsigned char, "=q", :"memory") 54 build_mmio_read(readw, "w", unsigned short, "=r", :"memory") 55 build_mmio_read(readl, "l", unsigned int, "=r", :"memory") 56 57 build_mmio_read(__readb, "b", unsigned char, "=q", ) 58 build_mmio_read(__readw, "w", unsigned short, "=r", ) 59 build_mmio_read(__readl, "l", unsigned int, "=r", ) 60 61 build_mmio_write(writeb, "b", unsigned char, "q", :"memory") 62 build_mmio_write(writew, "w", unsigned short, "r", :"memory") 63 build_mmio_write(writel, "l", unsigned int, "r", :"memory") 64 65 build_mmio_write(__writeb, "b", unsigned char, "q", ) 66 build_mmio_write(__writew, "w", unsigned short, "r", ) 67 build_mmio_write(__writel, "l", unsigned int, "r", ) 68 69 #define readb_relaxed(a) __readb(a) 70 #define readw_relaxed(a) __readw(a) 71 #define readl_relaxed(a) __readl(a) 72 #define __raw_readb __readb 73 #define __raw_readw __readw 74 #define __raw_readl __readl 75 76 #define __raw_writeb __writeb 77 #define __raw_writew __writew 78 #define __raw_writel __writel 79 80 #define mmiowb() barrier() 81 82 #ifdef CONFIG_X86_64 83 84 build_mmio_read(readq, "q", unsigned long, "=r", :"memory") 85 build_mmio_write(writeq, "q", unsigned long, "r", :"memory") 86 87 #define readq_relaxed(a) readq(a) 88 89 #define __raw_readq(a) readq(a) 90 #define __raw_writeq(val, addr) writeq(val, addr) 91 92 /* Let people know that we have them */ 93 #define readq readq 94 #define writeq writeq 95 96 #endif 97 98 /** 99 * virt_to_phys - map virtual addresses to physical 100 * @address: address to remap 101 * 102 * The returned physical address is the physical (CPU) mapping for 103 * the memory address given. It is only valid to use this function on 104 * addresses directly mapped or allocated via kmalloc. 105 * 106 * This function does not give bus mappings for DMA transfers. In 107 * almost all conceivable cases a device driver should not be using 108 * this function 109 */ 110 111 static inline phys_addr_t virt_to_phys(volatile void *address) 112 { 113 return __pa(address); 114 } 115 116 /** 117 * phys_to_virt - map physical address to virtual 118 * @address: address to remap 119 * 120 * The returned virtual address is a current CPU mapping for 121 * the memory address given. It is only valid to use this function on 122 * addresses that have a kernel mapping 123 * 124 * This function does not handle 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 void *phys_to_virt(phys_addr_t address) 130 { 131 return __va(address); 132 } 133 134 /* 135 * Change "struct page" to physical address. 136 */ 137 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) 138 139 /* 140 * ISA I/O bus memory addresses are 1:1 with the physical address. 141 * However, we truncate the address to unsigned int to avoid undesirable 142 * promitions in legacy drivers. 143 */ 144 static inline unsigned int isa_virt_to_bus(volatile void *address) 145 { 146 return (unsigned int)virt_to_phys(address); 147 } 148 #define isa_page_to_bus(page) ((unsigned int)page_to_phys(page)) 149 #define isa_bus_to_virt phys_to_virt 150 151 /* 152 * However PCI ones are not necessarily 1:1 and therefore these interfaces 153 * are forbidden in portable PCI drivers. 154 * 155 * Allow them on x86 for legacy drivers, though. 156 */ 157 #define virt_to_bus virt_to_phys 158 #define bus_to_virt phys_to_virt 159 160 /** 161 * ioremap - map bus memory into CPU space 162 * @offset: bus address of the memory 163 * @size: size of the resource to map 164 * 165 * ioremap performs a platform specific sequence of operations to 166 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 167 * writew/writel functions and the other mmio helpers. The returned 168 * address is not guaranteed to be usable directly as a virtual 169 * address. 170 * 171 * If the area you are trying to map is a PCI BAR you should have a 172 * look at pci_iomap(). 173 */ 174 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); 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, 177 unsigned long prot_val); 178 179 /* 180 * The default ioremap() behavior is non-cached: 181 */ 182 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size) 183 { 184 return ioremap_nocache(offset, size); 185 } 186 187 extern void iounmap(volatile void __iomem *addr); 188 189 extern void set_iounmap_nonlazy(void); 190 191 #ifdef __KERNEL__ 192 193 #include <asm-generic/iomap.h> 194 195 #include <linux/vmalloc.h> 196 197 /* 198 * Convert a virtual cached pointer to an uncached pointer 199 */ 200 #define xlate_dev_kmem_ptr(p) p 201 202 static inline void 203 memset_io(volatile void __iomem *addr, unsigned char val, size_t count) 204 { 205 memset((void __force *)addr, val, count); 206 } 207 208 static inline void 209 memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count) 210 { 211 memcpy(dst, (const void __force *)src, count); 212 } 213 214 static inline void 215 memcpy_toio(volatile void __iomem *dst, const void *src, size_t count) 216 { 217 memcpy((void __force *)dst, src, count); 218 } 219 220 /* 221 * ISA space is 'always mapped' on a typical x86 system, no need to 222 * explicitly ioremap() it. The fact that the ISA IO space is mapped 223 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 224 * are physical addresses. The following constant pointer can be 225 * used as the IO-area pointer (it can be iounmapped as well, so the 226 * analogy with PCI is quite large): 227 */ 228 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) 229 230 /* 231 * Cache management 232 * 233 * This needed for two cases 234 * 1. Out of order aware processors 235 * 2. Accidentally out of order processors (PPro errata #51) 236 */ 237 238 static inline void flush_write_buffers(void) 239 { 240 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE) 241 asm volatile("lock; addl $0,0(%%esp)": : :"memory"); 242 #endif 243 } 244 245 #endif /* __KERNEL__ */ 246 247 extern void native_io_delay(void); 248 249 extern int io_delay_type; 250 extern void io_delay_init(void); 251 252 #if defined(CONFIG_PARAVIRT) 253 #include <asm/paravirt.h> 254 #else 255 256 static inline void slow_down_io(void) 257 { 258 native_io_delay(); 259 #ifdef REALLY_SLOW_IO 260 native_io_delay(); 261 native_io_delay(); 262 native_io_delay(); 263 #endif 264 } 265 266 #endif 267 268 #define BUILDIO(bwl, bw, type) \ 269 static inline void out##bwl(unsigned type value, int port) \ 270 { \ 271 asm volatile("out" #bwl " %" #bw "0, %w1" \ 272 : : "a"(value), "Nd"(port)); \ 273 } \ 274 \ 275 static inline unsigned type in##bwl(int port) \ 276 { \ 277 unsigned type value; \ 278 asm volatile("in" #bwl " %w1, %" #bw "0" \ 279 : "=a"(value) : "Nd"(port)); \ 280 return value; \ 281 } \ 282 \ 283 static inline void out##bwl##_p(unsigned type value, int port) \ 284 { \ 285 out##bwl(value, port); \ 286 slow_down_io(); \ 287 } \ 288 \ 289 static inline unsigned type in##bwl##_p(int port) \ 290 { \ 291 unsigned type value = in##bwl(port); \ 292 slow_down_io(); \ 293 return value; \ 294 } \ 295 \ 296 static inline void outs##bwl(int port, const void *addr, unsigned long count) \ 297 { \ 298 asm volatile("rep; outs" #bwl \ 299 : "+S"(addr), "+c"(count) : "d"(port)); \ 300 } \ 301 \ 302 static inline void ins##bwl(int port, void *addr, unsigned long count) \ 303 { \ 304 asm volatile("rep; ins" #bwl \ 305 : "+D"(addr), "+c"(count) : "d"(port)); \ 306 } 307 308 BUILDIO(b, b, char) 309 BUILDIO(w, w, short) 310 BUILDIO(l, , int) 311 312 extern void *xlate_dev_mem_ptr(unsigned long phys); 313 extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr); 314 315 extern int ioremap_change_attr(unsigned long vaddr, unsigned long size, 316 unsigned long prot_val); 317 extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size); 318 319 /* 320 * early_ioremap() and early_iounmap() are for temporary early boot-time 321 * mappings, before the real ioremap() is functional. 322 * A boot-time mapping is currently limited to at most 16 pages. 323 */ 324 extern void early_ioremap_init(void); 325 extern void early_ioremap_reset(void); 326 extern void __iomem *early_ioremap(resource_size_t phys_addr, 327 unsigned long size); 328 extern void __iomem *early_memremap(resource_size_t phys_addr, 329 unsigned long size); 330 extern void early_iounmap(void __iomem *addr, unsigned long size); 331 extern void fixup_early_ioremap(void); 332 extern bool is_early_ioremap_ptep(pte_t *ptep); 333 334 #ifdef CONFIG_XEN 335 #include <xen/xen.h> 336 struct bio_vec; 337 338 extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 339 const struct bio_vec *vec2); 340 341 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 342 (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ 343 (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) 344 #endif /* CONFIG_XEN */ 345 346 #define IO_SPACE_LIMIT 0xffff 347 348 #endif /* _ASM_X86_IO_H */ 349