4 #include <linux/config.h>
7 * This file contains the definitions for the x86 IO instructions
8 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
9 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
10 * versions of the single-IO instructions (inb_p/inw_p/..).
12 * This file is not meant to be obfuscating: it's just complicated
13 * to (a) handle it all in a way that makes gcc able to optimize it
14 * as well as possible and (b) trying to avoid writing the same thing
15 * over and over again with slight variations and possibly making a
20 * Thanks to James van Artsdalen for a better timing-fix than
21 * the two short jumps: using outb's to a nonexistent port seems
22 * to guarantee better timings even on fast machines.
24 * On the other hand, I'd like to be sure of a non-existent port:
25 * I feel a bit unsafe about using 0x80 (should be safe, though)
31 * Bit simplified and optimized by Jan Hubicka
32 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
34 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
35 * isa_read[wl] and isa_write[wl] fixed
36 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
39 #ifdef SLOW_IO_BY_JUMPING
40 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
42 #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
46 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
48 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
52 * Talk about misusing macros..
55 extern inline void out##s(unsigned x value, unsigned short port) {
57 #define __OUT2(s,s1,s2) \
58 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
60 #define __OUT(s,s1,x) \
61 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
62 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
65 extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
67 #define __IN2(s,s1,s2) \
68 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
70 #define __IN(s,s1,i...) \
71 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
72 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
75 extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
76 { __asm__ __volatile__ ("rep ; ins" #s \
77 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
80 extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
81 { __asm__ __volatile__ ("rep ; outs" #s \
82 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
84 #define RETURN_TYPE unsigned char
87 #define RETURN_TYPE unsigned short
90 #define RETURN_TYPE unsigned int
106 #define IO_SPACE_LIMIT 0xffff
108 #if defined(__KERNEL__) && __x86_64__
110 #include <linux/vmalloc.h>
114 * Change virtual addresses to physical addresses and vv.
115 * These are pretty trivial
117 extern inline unsigned long virt_to_phys(volatile void * address)
119 return __pa(address);
122 extern inline void * phys_to_virt(unsigned long address)
124 return __va(address);
129 * Change "struct page" to physical address.
131 #ifdef CONFIG_DISCONTIGMEM
132 #include <asm/mmzone.h>
133 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
135 #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
138 #include <asm-generic/iomap.h>
140 extern void __iomem *__ioremap(unsigned long offset, unsigned long size, unsigned long flags);
142 extern inline void __iomem * ioremap (unsigned long offset, unsigned long size)
144 return __ioremap(offset, size, 0);
148 * This one maps high address device memory and turns off caching for that area.
149 * it's useful if some control registers are in such an area and write combining
150 * or read caching is not desirable:
152 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
153 extern void iounmap(volatile void __iomem *addr);
156 * ISA I/O bus memory addresses are 1:1 with the physical address.
158 #define isa_virt_to_bus virt_to_phys
159 #define isa_page_to_bus page_to_phys
160 #define isa_bus_to_virt phys_to_virt
163 * However PCI ones are not necessarily 1:1 and therefore these interfaces
164 * are forbidden in portable PCI drivers.
166 * Allow them on x86 for legacy drivers, though.
168 #define virt_to_bus virt_to_phys
169 #define bus_to_virt phys_to_virt
172 * readX/writeX() are used to access memory mapped devices. On some
173 * architectures the memory mapped IO stuff needs to be accessed
174 * differently. On the x86 architecture, we just read/write the
175 * memory location directly.
178 static inline __u8 __readb(const volatile void __iomem *addr)
180 return *(__force volatile __u8 *)addr;
182 static inline __u16 __readw(const volatile void __iomem *addr)
184 return *(__force volatile __u16 *)addr;
186 static inline __u32 __readl(const volatile void __iomem *addr)
188 return *(__force volatile __u32 *)addr;
190 static inline __u64 __readq(const volatile void __iomem *addr)
192 return *(__force volatile __u64 *)addr;
194 #define readb(x) __readb(x)
195 #define readw(x) __readw(x)
196 #define readl(x) __readl(x)
197 #define readq(x) __readq(x)
198 #define readb_relaxed(a) readb(a)
199 #define readw_relaxed(a) readw(a)
200 #define readl_relaxed(a) readl(a)
201 #define readq_relaxed(a) readq(a)
202 #define __raw_readb readb
203 #define __raw_readw readw
204 #define __raw_readl readl
205 #define __raw_readq readq
209 #ifdef CONFIG_UNORDERED_IO
210 static inline void __writel(__u32 val, volatile void __iomem *addr)
212 volatile __u32 __iomem *target = addr;
213 asm volatile("movnti %1,%0"
215 : "r" (val) : "memory");
218 static inline void __writeq(__u64 val, volatile void __iomem *addr)
220 volatile __u64 __iomem *target = addr;
221 asm volatile("movnti %1,%0"
223 : "r" (val) : "memory");
226 static inline void __writel(__u32 b, volatile void __iomem *addr)
228 *(__force volatile __u32 *)addr = b;
230 static inline void __writeq(__u64 b, volatile void __iomem *addr)
232 *(__force volatile __u64 *)addr = b;
235 static inline void __writeb(__u8 b, volatile void __iomem *addr)
237 *(__force volatile __u8 *)addr = b;
239 static inline void __writew(__u16 b, volatile void __iomem *addr)
241 *(__force volatile __u16 *)addr = b;
243 #define writeq(val,addr) __writeq((val),(addr))
244 #define writel(val,addr) __writel((val),(addr))
245 #define writew(val,addr) __writew((val),(addr))
246 #define writeb(val,addr) __writeb((val),(addr))
247 #define __raw_writeb writeb
248 #define __raw_writew writew
249 #define __raw_writel writel
250 #define __raw_writeq writeq
252 void __memcpy_fromio(void*,unsigned long,unsigned);
253 void __memcpy_toio(unsigned long,const void*,unsigned);
255 static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
257 __memcpy_fromio(to,(unsigned long)from,len);
259 static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
261 __memcpy_toio((unsigned long)to,from,len);
264 void memset_io(volatile void __iomem *a, int b, size_t c);
267 * ISA space is 'always mapped' on a typical x86 system, no need to
268 * explicitly ioremap() it. The fact that the ISA IO space is mapped
269 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
270 * are physical addresses. The following constant pointer can be
271 * used as the IO-area pointer (it can be iounmapped as well, so the
272 * analogy with PCI is quite large):
274 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
276 #define isa_readb(a) readb(__ISA_IO_base + (a))
277 #define isa_readw(a) readw(__ISA_IO_base + (a))
278 #define isa_readl(a) readl(__ISA_IO_base + (a))
279 #define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a))
280 #define isa_writew(w,a) writew(w,__ISA_IO_base + (a))
281 #define isa_writel(l,a) writel(l,__ISA_IO_base + (a))
282 #define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c))
283 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
284 #define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c))
288 * Again, x86-64 does not require mem IO specific function.
291 #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
292 #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(__ISA_IO_base + (b)),(c),(d))
295 * check_signature - find BIOS signatures
296 * @io_addr: mmio address to check
297 * @signature: signature block
298 * @length: length of signature
300 * Perform a signature comparison with the mmio address io_addr. This
301 * address should have been obtained by ioremap.
302 * Returns 1 on a match.
305 static inline int check_signature(void __iomem *io_addr,
306 const unsigned char *signature, int length)
310 if (readb(io_addr) != *signature)
323 #define dma_cache_inv(_start,_size) do { } while (0)
324 #define dma_cache_wback(_start,_size) do { } while (0)
325 #define dma_cache_wback_inv(_start,_size) do { } while (0)
327 #define flush_write_buffers()
329 extern int iommu_bio_merge;
330 #define BIO_VMERGE_BOUNDARY iommu_bio_merge
332 #endif /* __KERNEL__ */