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1.1 root 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: #ifdef SLOW_IO_BY_JUMPING
29: #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
30: #else
31: #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
32: #endif
33:
34: #ifdef REALLY_SLOW_IO
35: #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
36: #else
37: #define SLOW_DOWN_IO __SLOW_DOWN_IO
38: #endif
39:
40: /*
41: * Change virtual addresses to physical addresses and vv.
42: * These are trivial on the 1:1 Linux/i386 mapping (but if we ever
43: * make the kernel segment mapped at 0, we need to do translation
44: * on the i386 as well)
45: */
46: extern inline unsigned long virt_to_phys(volatile void * address)
47: {
48: return (unsigned long) address;
49: }
50:
51: extern inline void * phys_to_virt(unsigned long address)
52: {
53: return (void *) address;
54: }
55:
56: /*
57: * IO bus memory addresses are also 1:1 with the physical address
58: */
59: #define virt_to_bus virt_to_phys
60: #define bus_to_virt phys_to_virt
61:
62: /*
63: * readX/writeX() are used to access memory mapped devices. On some
64: * architectures the memory mapped IO stuff needs to be accessed
65: * differently. On the x86 architecture, we just read/write the
66: * memory location directly.
67: */
68: #define readb(addr) (*(volatile unsigned char *) (addr))
69: #define readw(addr) (*(volatile unsigned short *) (addr))
70: #define readl(addr) (*(volatile unsigned int *) (addr))
71:
72: #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
73: #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
74: #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
75:
76: #define memset_io(a,b,c) memset((void *)(a),(b),(c))
77: #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
78: #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
79:
80: /*
81: * Again, i386 does not require mem IO specific function.
82: */
83:
84: #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
85:
86: /*
87: * Talk about misusing macros..
88: */
89:
90: #define __OUT1(s,x) \
91: extern inline void __out##s(unsigned x value, unsigned short port) {
92:
93: #define __OUT2(s,s1,s2) \
94: __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
95:
96: #define __OUT(s,s1,x) \
97: __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
98: __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
99: __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
100: __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
101:
102: #define __IN1(s) \
103: extern inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
104:
105: #define __IN2(s,s1,s2) \
106: __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
107:
108: #define __IN(s,s1,i...) \
109: __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
110: __IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
111: __IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
112: __IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
113:
114: #define __INS(s) \
115: extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
116: { __asm__ __volatile__ ("cld ; rep ; ins" #s \
117: : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
118:
119: #define __OUTS(s) \
120: extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
121: { __asm__ __volatile__ ("cld ; rep ; outs" #s \
122: : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
123:
124: #define RETURN_TYPE unsigned char
125: /* __IN(b,"b","0" (0)) */
126: __IN(b,"")
127: #undef RETURN_TYPE
128: #define RETURN_TYPE unsigned short
129: /* __IN(w,"w","0" (0)) */
130: __IN(w,"")
131: #undef RETURN_TYPE
132: #define RETURN_TYPE unsigned int
133: __IN(l,"")
134: #undef RETURN_TYPE
135:
136: __OUT(b,"b",char)
137: __OUT(w,"w",short)
138: __OUT(l,,int)
139:
140: __INS(b)
141: __INS(w)
142: __INS(l)
143:
144: __OUTS(b)
145: __OUTS(w)
146: __OUTS(l)
147:
148: /*
149: * Note that due to the way __builtin_constant_p() works, you
150: * - can't use it inside a inline function (it will never be true)
151: * - you don't have to worry about side effects within the __builtin..
152: */
153: #define outb(val,port) \
154: ((__builtin_constant_p((port)) && (port) < 256) ? \
155: __outbc((val),(port)) : \
156: __outb((val),(port)))
157:
158: #define inb(port) \
159: ((__builtin_constant_p((port)) && (port) < 256) ? \
160: __inbc(port) : \
161: __inb(port))
162:
163: #define outb_p(val,port) \
164: ((__builtin_constant_p((port)) && (port) < 256) ? \
165: __outbc_p((val),(port)) : \
166: __outb_p((val),(port)))
167:
168: #define inb_p(port) \
169: ((__builtin_constant_p((port)) && (port) < 256) ? \
170: __inbc_p(port) : \
171: __inb_p(port))
172:
173: #define outw(val,port) \
174: ((__builtin_constant_p((port)) && (port) < 256) ? \
175: __outwc((val),(port)) : \
176: __outw((val),(port)))
177:
178: #define inw(port) \
179: ((__builtin_constant_p((port)) && (port) < 256) ? \
180: __inwc(port) : \
181: __inw(port))
182:
183: #define outw_p(val,port) \
184: ((__builtin_constant_p((port)) && (port) < 256) ? \
185: __outwc_p((val),(port)) : \
186: __outw_p((val),(port)))
187:
188: #define inw_p(port) \
189: ((__builtin_constant_p((port)) && (port) < 256) ? \
190: __inwc_p(port) : \
191: __inw_p(port))
192:
193: #define outl(val,port) \
194: ((__builtin_constant_p((port)) && (port) < 256) ? \
195: __outlc((val),(port)) : \
196: __outl((val),(port)))
197:
198: #define inl(port) \
199: ((__builtin_constant_p((port)) && (port) < 256) ? \
200: __inlc(port) : \
201: __inl(port))
202:
203: #define outl_p(val,port) \
204: ((__builtin_constant_p((port)) && (port) < 256) ? \
205: __outlc_p((val),(port)) : \
206: __outl_p((val),(port)))
207:
208: #define inl_p(port) \
209: ((__builtin_constant_p((port)) && (port) < 256) ? \
210: __inlc_p(port) : \
211: __inl_p(port))
212:
213: #endif
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