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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:
1.1.1.2 ! root 28: #include <machine/vm_param.h>
! 29:
1.1 root 30: #ifdef SLOW_IO_BY_JUMPING
31: #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
32: #else
33: #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
34: #endif
35:
36: #ifdef REALLY_SLOW_IO
37: #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
38: #else
39: #define SLOW_DOWN_IO __SLOW_DOWN_IO
40: #endif
41:
42: /*
43: * Change virtual addresses to physical addresses and vv.
44: * These are trivial on the 1:1 Linux/i386 mapping (but if we ever
45: * make the kernel segment mapped at 0, we need to do translation
46: * on the i386 as well)
47: */
48: extern inline unsigned long virt_to_phys(volatile void * address)
49: {
1.1.1.2 ! root 50: return (unsigned long) _kvtophys(address);
1.1 root 51: }
52:
53: extern inline void * phys_to_virt(unsigned long address)
54: {
1.1.1.2 ! root 55: return (void *) phystokv(address);
1.1 root 56: }
57:
58: /*
59: * IO bus memory addresses are also 1:1 with the physical address
60: */
61: #define virt_to_bus virt_to_phys
62: #define bus_to_virt phys_to_virt
63:
64: /*
65: * readX/writeX() are used to access memory mapped devices. On some
66: * architectures the memory mapped IO stuff needs to be accessed
67: * differently. On the x86 architecture, we just read/write the
68: * memory location directly.
69: */
70: #define readb(addr) (*(volatile unsigned char *) (addr))
71: #define readw(addr) (*(volatile unsigned short *) (addr))
72: #define readl(addr) (*(volatile unsigned int *) (addr))
73:
74: #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
75: #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
76: #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
77:
78: #define memset_io(a,b,c) memset((void *)(a),(b),(c))
79: #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
80: #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
81:
82: /*
83: * Again, i386 does not require mem IO specific function.
84: */
85:
86: #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
87:
88: /*
89: * Talk about misusing macros..
90: */
91:
92: #define __OUT1(s,x) \
93: extern inline void __out##s(unsigned x value, unsigned short port) {
94:
95: #define __OUT2(s,s1,s2) \
96: __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
97:
98: #define __OUT(s,s1,x) \
99: __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
100: __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
101: __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
102: __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
103:
104: #define __IN1(s) \
105: extern inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
106:
107: #define __IN2(s,s1,s2) \
108: __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
109:
110: #define __IN(s,s1,i...) \
111: __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
112: __IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
113: __IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
114: __IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
115:
116: #define __INS(s) \
117: extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
118: { __asm__ __volatile__ ("cld ; rep ; ins" #s \
119: : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
120:
121: #define __OUTS(s) \
122: extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
123: { __asm__ __volatile__ ("cld ; rep ; outs" #s \
124: : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
125:
126: #define RETURN_TYPE unsigned char
127: /* __IN(b,"b","0" (0)) */
128: __IN(b,"")
129: #undef RETURN_TYPE
130: #define RETURN_TYPE unsigned short
131: /* __IN(w,"w","0" (0)) */
132: __IN(w,"")
133: #undef RETURN_TYPE
134: #define RETURN_TYPE unsigned int
135: __IN(l,"")
136: #undef RETURN_TYPE
137:
138: __OUT(b,"b",char)
139: __OUT(w,"w",short)
140: __OUT(l,,int)
141:
142: __INS(b)
143: __INS(w)
144: __INS(l)
145:
146: __OUTS(b)
147: __OUTS(w)
148: __OUTS(l)
149:
150: /*
151: * Note that due to the way __builtin_constant_p() works, you
152: * - can't use it inside a inline function (it will never be true)
153: * - you don't have to worry about side effects within the __builtin..
154: */
155: #define outb(val,port) \
156: ((__builtin_constant_p((port)) && (port) < 256) ? \
157: __outbc((val),(port)) : \
158: __outb((val),(port)))
159:
160: #define inb(port) \
161: ((__builtin_constant_p((port)) && (port) < 256) ? \
162: __inbc(port) : \
163: __inb(port))
164:
165: #define outb_p(val,port) \
166: ((__builtin_constant_p((port)) && (port) < 256) ? \
167: __outbc_p((val),(port)) : \
168: __outb_p((val),(port)))
169:
170: #define inb_p(port) \
171: ((__builtin_constant_p((port)) && (port) < 256) ? \
172: __inbc_p(port) : \
173: __inb_p(port))
174:
175: #define outw(val,port) \
176: ((__builtin_constant_p((port)) && (port) < 256) ? \
177: __outwc((val),(port)) : \
178: __outw((val),(port)))
179:
180: #define inw(port) \
181: ((__builtin_constant_p((port)) && (port) < 256) ? \
182: __inwc(port) : \
183: __inw(port))
184:
185: #define outw_p(val,port) \
186: ((__builtin_constant_p((port)) && (port) < 256) ? \
187: __outwc_p((val),(port)) : \
188: __outw_p((val),(port)))
189:
190: #define inw_p(port) \
191: ((__builtin_constant_p((port)) && (port) < 256) ? \
192: __inwc_p(port) : \
193: __inw_p(port))
194:
195: #define outl(val,port) \
196: ((__builtin_constant_p((port)) && (port) < 256) ? \
197: __outlc((val),(port)) : \
198: __outl((val),(port)))
199:
200: #define inl(port) \
201: ((__builtin_constant_p((port)) && (port) < 256) ? \
202: __inlc(port) : \
203: __inl(port))
204:
205: #define outl_p(val,port) \
206: ((__builtin_constant_p((port)) && (port) < 256) ? \
207: __outlc_p((val),(port)) : \
208: __outl_p((val),(port)))
209:
210: #define inl_p(port) \
211: ((__builtin_constant_p((port)) && (port) < 256) ? \
212: __inlc_p(port) : \
213: __inl_p(port))
214:
215: #endif
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