4 #include <linux/config.h>
5 #include <asm/fixmap.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);
128 #define virt_to_bus(_x) phys_to_machine(__pa(_x))
129 #define bus_to_virt(_x) __va(machine_to_phys(_x))
133 * Change "struct page" to physical address.
135 #ifdef CONFIG_DISCONTIGMEM
136 #include <asm/mmzone.h>
137 #define page_to_pseudophys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
138 #define page_to_phys(page) (phys_to_machine(page_to_pseudophys(page)))
140 #define bio_to_pseudophys(bio) (page_to_pseudophys(bio_page((bio))) + \
141 (unsigned long) bio_offset((bio)))
142 #define bvec_to_pseudophys(bv) (page_to_pseudophys((bv)->bv_page) + \
143 (unsigned long) (bv)->bv_offset)
145 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
146 (((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) && \
147 ((bvec_to_pseudophys((vec1)) + (vec1)->bv_len) == \
148 bvec_to_pseudophys((vec2))))
150 // #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
151 #define page_to_pseudophys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
152 #define page_to_phys(page) (phys_to_machine(page_to_pseudophys(page)))
154 #define bio_to_pseudophys(bio) (page_to_pseudophys(bio_page((bio))) + \
155 (unsigned long) bio_offset((bio)))
156 #define bvec_to_pseudophys(bv) (page_to_pseudophys((bv)->bv_page) + \
157 (unsigned long) (bv)->bv_offset)
159 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \
160 (((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) && \
161 ((bvec_to_pseudophys((vec1)) + (vec1)->bv_len) == \
162 bvec_to_pseudophys((vec2))))
165 #include <asm-generic/iomap.h>
167 extern void __iomem *__ioremap(unsigned long offset, unsigned long size, unsigned long flags);
169 extern inline void __iomem * ioremap (unsigned long offset, unsigned long size)
171 return __ioremap(offset, size, 0);
175 * This one maps high address device memory and turns off caching for that area.
176 * it's useful if some control registers are in such an area and write combining
177 * or read caching is not desirable:
179 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
180 extern void iounmap(volatile void __iomem *addr);
183 * ISA I/O bus memory addresses are 1:1 with the physical address.
186 #define isa_virt_to_bus(_x) isa_virt_to_bus_is_UNSUPPORTED->x
187 #define isa_page_to_bus(_x) isa_page_to_bus_is_UNSUPPORTED->x
188 #ifdef CONFIG_XEN_PHYSDEV_ACCESS
189 #define isa_bus_to_virt(_x) (void *)(__fix_to_virt(FIX_ISAMAP_BEGIN) + (_x))
191 #define isa_bus_to_virt(_x) isa_bus_to_virt_needs_PRIVILEGED_BUILD
194 * However PCI ones are not necessarily 1:1 and therefore these interfaces
195 * are forbidden in portable PCI drivers.
197 * Allow them on x86 for legacy drivers, though.
199 #define virt_to_bus(_x) phys_to_machine(__pa(_x))
200 #define bus_to_virt(_x) __va(machine_to_phys(_x))
203 * readX/writeX() are used to access memory mapped devices. On some
204 * architectures the memory mapped IO stuff needs to be accessed
205 * differently. On the x86 architecture, we just read/write the
206 * memory location directly.
209 static inline __u8 __readb(const volatile void __iomem *addr)
211 return *(__force volatile __u8 *)addr;
213 static inline __u16 __readw(const volatile void __iomem *addr)
215 return *(__force volatile __u16 *)addr;
217 static inline __u32 __readl(const volatile void __iomem *addr)
219 return *(__force volatile __u32 *)addr;
221 static inline __u64 __readq(const volatile void __iomem *addr)
223 return *(__force volatile __u64 *)addr;
225 #define readb(x) __readb(x)
226 #define readw(x) __readw(x)
227 #define readl(x) __readl(x)
228 #define readq(x) __readq(x)
229 #define readb_relaxed(a) readb(a)
230 #define readw_relaxed(a) readw(a)
231 #define readl_relaxed(a) readl(a)
232 #define readq_relaxed(a) readq(a)
233 #define __raw_readb readb
234 #define __raw_readw readw
235 #define __raw_readl readl
236 #define __raw_readq readq
240 #ifdef CONFIG_UNORDERED_IO
241 static inline void __writel(__u32 val, volatile void __iomem *addr)
243 volatile __u32 __iomem *target = addr;
244 asm volatile("movnti %1,%0"
246 : "r" (val) : "memory");
249 static inline void __writeq(__u64 val, volatile void __iomem *addr)
251 volatile __u64 __iomem *target = addr;
252 asm volatile("movnti %1,%0"
254 : "r" (val) : "memory");
257 static inline void __writel(__u32 b, volatile void __iomem *addr)
259 *(__force volatile __u32 *)addr = b;
261 static inline void __writeq(__u64 b, volatile void __iomem *addr)
263 *(__force volatile __u64 *)addr = b;
266 static inline void __writeb(__u8 b, volatile void __iomem *addr)
268 *(__force volatile __u8 *)addr = b;
270 static inline void __writew(__u16 b, volatile void __iomem *addr)
272 *(__force volatile __u16 *)addr = b;
274 #define writeq(val,addr) __writeq((val),(addr))
275 #define writel(val,addr) __writel((val),(addr))
276 #define writew(val,addr) __writew((val),(addr))
277 #define writeb(val,addr) __writeb((val),(addr))
278 #define __raw_writeb writeb
279 #define __raw_writew writew
280 #define __raw_writel writel
281 #define __raw_writeq writeq
283 void __memcpy_fromio(void*,unsigned long,unsigned);
284 void __memcpy_toio(unsigned long,const void*,unsigned);
286 static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
288 __memcpy_fromio(to,(unsigned long)from,len);
290 static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
292 __memcpy_toio((unsigned long)to,from,len);
295 void memset_io(volatile void __iomem *a, int b, size_t c);
298 * ISA space is 'always mapped' on a typical x86 system, no need to
299 * explicitly ioremap() it. The fact that the ISA IO space is mapped
300 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
301 * are physical addresses. The following constant pointer can be
302 * used as the IO-area pointer (it can be iounmapped as well, so the
303 * analogy with PCI is quite large):
305 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
307 #define isa_readb(a) readb(__ISA_IO_base + (a))
308 #define isa_readw(a) readw(__ISA_IO_base + (a))
309 #define isa_readl(a) readl(__ISA_IO_base + (a))
310 #define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a))
311 #define isa_writew(w,a) writew(w,__ISA_IO_base + (a))
312 #define isa_writel(l,a) writel(l,__ISA_IO_base + (a))
313 #define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c))
314 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
315 #define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c))
319 * Again, x86-64 does not require mem IO specific function.
322 #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
323 #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(__ISA_IO_base + (b)),(c),(d))
326 * check_signature - find BIOS signatures
327 * @io_addr: mmio address to check
328 * @signature: signature block
329 * @length: length of signature
331 * Perform a signature comparison with the mmio address io_addr. This
332 * address should have been obtained by ioremap.
333 * Returns 1 on a match.
336 static inline int check_signature(void __iomem *io_addr,
337 const unsigned char *signature, int length)
341 if (readb(io_addr) != *signature)
354 #define dma_cache_inv(_start,_size) do { } while (0)
355 #define dma_cache_wback(_start,_size) do { } while (0)
356 #define dma_cache_wback_inv(_start,_size) do { } while (0)
358 #define flush_write_buffers()
360 extern int iommu_bio_merge;
361 #define BIO_VMERGE_BOUNDARY iommu_bio_merge
363 #endif /* __KERNEL__ */