4 #include <linux/compiler.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 #define IO_SPACE_LIMIT 0xffff
41 #include <asm/types.h>
48 * readX/writeX() are used to access memory mapped devices. On some
49 * architectures the memory mapped IO stuff needs to be accessed
50 * differently. On the x86 architecture, we just read/write the
51 * memory location directly.
54 #define readb(addr) (*(volatile unsigned char *) (addr))
55 #define readw(addr) (*(volatile unsigned short *) (addr))
56 #define readl(addr) (*(volatile unsigned int *) (addr))
57 #define __raw_readb readb
58 #define __raw_readw readw
59 #define __raw_readl readl
61 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
62 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
63 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
64 #define __raw_writeb writeb
65 #define __raw_writew writew
66 #define __raw_writel writel
68 #define memset_io(a,b,c) memset((a),(b),(c))
69 #define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
70 #define memcpy_toio(a,b,c) memcpy((a),(b),(c))
72 #define write_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a)
73 #define read_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a))
75 #define write_le64(a, v) write_arch(q, le64, a, v)
76 #define write_le32(a, v) write_arch(l, le32, a, v)
77 #define write_le16(a, v) write_arch(w, le16, a, v)
79 #define read_le64(a) read_arch(q, le64, a)
80 #define read_le32(a) read_arch(l, le32, a)
81 #define read_le16(a) read_arch(w, le16, a)
83 #define write_be32(a, v) write_arch(l, be32, a, v)
84 #define write_be16(a, v) write_arch(w, be16, a, v)
86 #define read_be32(a) read_arch(l, be32, a)
87 #define read_be16(a) read_arch(w, be16, a)
89 #define write_8(a, v) __raw_writeb(v, a)
90 #define read_8(a) __raw_readb(a)
92 #define clrbits(type, addr, clear) \
93 write_##type((addr), read_##type(addr) & ~(clear))
95 #define setbits(type, addr, set) \
96 write_##type((addr), read_##type(addr) | (set))
98 #define clrsetbits(type, addr, clear, set) \
99 write_##type((addr), (read_##type(addr) & ~(clear)) | (set))
101 #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
102 #define setbits_be32(addr, set) setbits(be32, addr, set)
103 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
105 #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
106 #define setbits_le32(addr, set) setbits(le32, addr, set)
107 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
109 #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
110 #define setbits_be16(addr, set) setbits(be16, addr, set)
111 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
113 #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
114 #define setbits_le16(addr, set) setbits(le16, addr, set)
115 #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
117 #define clrbits_8(addr, clear) clrbits(8, addr, clear)
118 #define setbits_8(addr, set) setbits(8, addr, set)
119 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
122 * ISA space is 'always mapped' on a typical x86 system, no need to
123 * explicitly ioremap() it. The fact that the ISA IO space is mapped
124 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
125 * are physical addresses. The following constant pointer can be
126 * used as the IO-area pointer (it can be iounmapped as well, so the
127 * analogy with PCI is quite large):
129 #define isa_readb(a) readb((a))
130 #define isa_readw(a) readw((a))
131 #define isa_readl(a) readl((a))
132 #define isa_writeb(b,a) writeb(b,(a))
133 #define isa_writew(w,a) writew(w,(a))
134 #define isa_writel(l,a) writel(l,(a))
135 #define isa_memset_io(a,b,c) memset_io((a),(b),(c))
136 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
137 #define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
140 static inline int check_signature(unsigned long io_addr,
141 const unsigned char *signature, int length)
145 if (readb(io_addr) != *signature)
157 * isa_check_signature - find BIOS signatures
158 * @io_addr: mmio address to check
159 * @signature: signature block
160 * @length: length of signature
162 * Perform a signature comparison with the ISA mmio address io_addr.
163 * Returns 1 on a match.
165 * This function is deprecated. New drivers should use ioremap and
170 static inline int isa_check_signature(unsigned long io_addr,
171 const unsigned char *signature, int length)
175 if (isa_readb(io_addr) != *signature)
186 #endif /* __KERNEL__ */
188 #ifdef SLOW_IO_BY_JUMPING
189 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
191 #define __SLOW_DOWN_IO "\noutb %%al,$0xed"
194 #ifdef REALLY_SLOW_IO
195 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
197 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
202 * Talk about misusing macros..
204 #define __OUT1(s,x) \
205 static inline void out##s(unsigned x value, unsigned short port) {
207 #define __OUT2(s,s1,s2) \
208 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
211 #define __OUT(s,s1,x) \
212 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
213 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
216 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
218 #define __IN2(s,s1,s2) \
219 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
221 #define __IN(s,s1,i...) \
222 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
223 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
226 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
227 { __asm__ __volatile__ ("rep ; ins" #s \
228 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
231 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
232 { __asm__ __volatile__ ("rep ; outs" #s \
233 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
235 #define RETURN_TYPE unsigned char
238 #define RETURN_TYPE unsigned short
241 #define RETURN_TYPE unsigned int
257 /* IO space accessors */
258 #define clrio(type, addr, clear) \
259 out##type(in##type(addr) & ~(clear), (addr))
261 #define setio(type, addr, set) \
262 out##type(in##type(addr) | (set), (addr))
264 #define clrsetio(type, addr, clear, set) \
265 out##type((in##type(addr) & ~(clear)) | (set), (addr))
267 #define clrio_32(addr, clear) clrio(l, addr, clear)
268 #define clrio_16(addr, clear) clrio(w, addr, clear)
269 #define clrio_8(addr, clear) clrio(b, addr, clear)
271 #define setio_32(addr, set) setio(l, addr, set)
272 #define setio_16(addr, set) setio(w, addr, set)
273 #define setio_8(addr, set) setio(b, addr, set)
275 #define clrsetio_32(addr, clear, set) clrsetio(l, addr, clear, set)
276 #define clrsetio_16(addr, clear, set) clrsetio(w, addr, clear, set)
277 #define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
279 static inline void sync(void)
284 * Given a physical address and a length, return a virtual address
285 * that can be used to access the memory range with the caching
286 * properties specified by "flags".
288 #define MAP_NOCACHE (0)
289 #define MAP_WRCOMBINE (0)
290 #define MAP_WRBACK (0)
291 #define MAP_WRTHROUGH (0)
294 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
296 return (void *)(uintptr_t)paddr;
300 * Take down a mapping set up by map_physmem().
302 static inline void unmap_physmem(void *vaddr, unsigned long flags)
307 static inline phys_addr_t virt_to_phys(void * vaddr)
309 return (phys_addr_t)(uintptr_t)(vaddr);
313 * TODO: The kernel offers some more advanced versions of barriers, it might
314 * have some advantages to use them instead of the simple one here.
316 #define dmb() __asm__ __volatile__ ("" : : : "memory")
317 #define __iormb() dmb()
318 #define __iowmb() dmb()