1 #ifndef _ASM_IO_H
2 #define _ASM_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 IO_SPACE_LIMIT 0xffff
38
39
40 #ifdef __KERNEL__
41
42
43 /*
44 * readX/writeX() are used to access memory mapped devices. On some
45 * architectures the memory mapped IO stuff needs to be accessed
46 * differently. On the x86 architecture, we just read/write the
47 * memory location directly.
48 */
49
50 #define readb(addr) (*(volatile unsigned char *) (addr))
51 #define readw(addr) (*(volatile unsigned short *) (addr))
52 #define readl(addr) (*(volatile unsigned int *) (addr))
53 #define __raw_readb readb
54 #define __raw_readw readw
55 #define __raw_readl readl
56
57 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
58 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
59 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
60 #define __raw_writeb writeb
61 #define __raw_writew writew
62 #define __raw_writel writel
63
64 #define memset_io(a,b,c) memset((a),(b),(c))
65 #define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
66 #define memcpy_toio(a,b,c) memcpy((a),(b),(c))
67
68 /*
69 * ISA space is 'always mapped' on a typical x86 system, no need to
70 * explicitly ioremap() it. The fact that the ISA IO space is mapped
71 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
72 * are physical addresses. The following constant pointer can be
73 * used as the IO-area pointer (it can be iounmapped as well, so the
74 * analogy with PCI is quite large):
75 */
76 #define isa_readb(a) readb((a))
77 #define isa_readw(a) readw((a))
78 #define isa_readl(a) readl((a))
79 #define isa_writeb(b,a) writeb(b,(a))
80 #define isa_writew(w,a) writew(w,(a))
81 #define isa_writel(l,a) writel(l,(a))
82 #define isa_memset_io(a,b,c) memset_io((a),(b),(c))
83 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
84 #define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
85
86
check_signature(unsigned long io_addr,const unsigned char * signature,int length)87 static inline int check_signature(unsigned long io_addr,
88 const unsigned char *signature, int length)
89 {
90 int retval = 0;
91 do {
92 if (readb(io_addr) != *signature)
93 goto out;
94 io_addr++;
95 signature++;
96 length--;
97 } while (length);
98 retval = 1;
99 out:
100 return retval;
101 }
102
103 /**
104 * isa_check_signature - find BIOS signatures
105 * @io_addr: mmio address to check
106 * @signature: signature block
107 * @length: length of signature
108 *
109 * Perform a signature comparison with the ISA mmio address io_addr.
110 * Returns 1 on a match.
111 *
112 * This function is deprecated. New drivers should use ioremap and
113 * check_signature.
114 */
115
116
isa_check_signature(unsigned long io_addr,const unsigned char * signature,int length)117 static inline int isa_check_signature(unsigned long io_addr,
118 const unsigned char *signature, int length)
119 {
120 int retval = 0;
121 do {
122 if (isa_readb(io_addr) != *signature)
123 goto out;
124 io_addr++;
125 signature++;
126 length--;
127 } while (length);
128 retval = 1;
129 out:
130 return retval;
131 }
132
133 #endif /* __KERNEL__ */
134
135 #ifdef SLOW_IO_BY_JUMPING
136 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
137 #else
138 #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
139 #endif
140
141 #ifdef REALLY_SLOW_IO
142 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
143 #else
144 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
145 #endif
146
147
148 /*
149 * Talk about misusing macros..
150 */
151 #define __OUT1(s,x) \
152 static inline void out##s(unsigned x value, unsigned short port) {
153
154 #define __OUT2(s,s1,s2) \
155 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
156
157
158 #define __OUT(s,s1,x) \
159 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
160 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
161
162 #define __IN1(s) \
163 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
164
165 #define __IN2(s,s1,s2) \
166 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
167
168 #define __IN(s,s1,i...) \
169 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
170 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
171
172 #define __INS(s) \
173 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
174 { __asm__ __volatile__ ("rep ; ins" #s \
175 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
176
177 #define __OUTS(s) \
178 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
179 { __asm__ __volatile__ ("rep ; outs" #s \
180 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
181
182 #define RETURN_TYPE unsigned char
183 __IN(b,"")
184 #undef RETURN_TYPE
185 #define RETURN_TYPE unsigned short
186 __IN(w,"")
187 #undef RETURN_TYPE
188 #define RETURN_TYPE unsigned int
189 __IN(l,"")
190 #undef RETURN_TYPE
191
192 __OUT(b,"b",char)
193 __OUT(w,"w",short)
194 __OUT(l,,int)
195
__INS(b)196 __INS(b)
197 __INS(w)
198 __INS(l)
199
200 __OUTS(b)
201 __OUTS(w)
202 __OUTS(l)
203
204 static inline void sync(void)
205 {
206 }
207
208 /*
209 * Given a physical address and a length, return a virtual address
210 * that can be used to access the memory range with the caching
211 * properties specified by "flags".
212 */
213 #define MAP_NOCACHE (0)
214 #define MAP_WRCOMBINE (0)
215 #define MAP_WRBACK (0)
216 #define MAP_WRTHROUGH (0)
217
218 static inline void *
map_physmem(phys_addr_t paddr,unsigned long len,unsigned long flags)219 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
220 {
221 return (void *)paddr;
222 }
223
224 /*
225 * Take down a mapping set up by map_physmem().
226 */
unmap_physmem(void * vaddr,unsigned long flags)227 static inline void unmap_physmem(void *vaddr, unsigned long flags)
228 {
229
230 }
231
virt_to_phys(void * vaddr)232 static inline phys_addr_t virt_to_phys(void * vaddr)
233 {
234 return (phys_addr_t)(vaddr);
235 }
236
237 #endif
238