1 #include <sys/ccompile.h>
2
3 #ifndef IO_H
4 #define IO_H
5
6 /* Amount of relocation etherboot is experiencing */
7 extern unsigned long virt_offset;
8
9 /* Don't require identity mapped physical memory,
10 * osloader.c is the only valid user at the moment.
11 */
12 unsigned long virt_to_phys(volatile const void *virt_addr);
13 void *phys_to_virt(unsigned long phys_addr);
14
15 /* virt_to_bus converts an addresss inside of etherboot [_start, _end]
16 * into a memory access cards can use.
17 */
18 #define virt_to_bus virt_to_phys
19
20
21 /* bus_to_virt reverses virt_to_bus, the address must be output
22 * from virt_to_bus to be valid. This function does not work on
23 * all bus addresses.
24 */
25 #define bus_to_virt phys_to_virt
26
27 /* ioremap converts a random 32bit bus address into something
28 * etherboot can access.
29 */
30 static inline void *ioremap(unsigned long bus_addr, unsigned long length __unused)
31 {
32 return bus_to_virt(bus_addr);
33 }
34
35 /* iounmap cleans up anything ioremap had to setup */
36 static inline void iounmap(void *virt_addr __unused)
37 {
38 return;
39 }
40
41 /*
42 * This file contains the definitions for the x86 IO instructions
43 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
44 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
45 * versions of the single-IO instructions (inb_p/inw_p/..).
46 *
47 * This file is not meant to be obfuscating: it's just complicated
48 * to (a) handle it all in a way that makes gcc able to optimize it
49 * as well as possible and (b) trying to avoid writing the same thing
50 * over and over again with slight variations and possibly making a
51 * mistake somewhere.
52 */
53
54 /*
55 * Thanks to James van Artsdalen for a better timing-fix than
56 * the two short jumps: using outb's to a nonexistent port seems
57 * to guarantee better timings even on fast machines.
58 *
59 * On the other hand, I'd like to be sure of a non-existent port:
60 * I feel a bit unsafe about using 0x80 (should be safe, though)
61 *
62 * Linus
63 */
64
65 #ifdef SLOW_IO_BY_JUMPING
66 #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
67 #else
68 #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
69 #endif
70
71 #ifdef REALLY_SLOW_IO
72 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
73 #else
74 #define SLOW_DOWN_IO __SLOW_DOWN_IO
75 #endif
76
77 /*
78 * readX/writeX() are used to access memory mapped devices. On some
79 * architectures the memory mapped IO stuff needs to be accessed
80 * differently. On the x86 architecture, we just read/write the
81 * memory location directly.
82 */
83 #define readb(addr) (*(volatile unsigned char *) (addr))
84 #define readw(addr) (*(volatile unsigned short *) (addr))
85 #define readl(addr) (*(volatile unsigned int *) (addr))
86
87 #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
88 #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
89 #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
90
91 #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
92 #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
93
94 /*
95 * Force strict CPU ordering.
96 * And yes, this is required on UP too when we're talking
97 * to devices.
98 *
99 * For now, "wmb()" doesn't actually do anything, as all
100 * Intel CPU's follow what Intel calls a *Processor Order*,
101 * in which all writes are seen in the program order even
102 * outside the CPU.
103 *
104 * I expect future Intel CPU's to have a weaker ordering,
105 * but I'd also expect them to finally get their act together
106 * and add some real memory barriers if so.
107 *
108 * Some non intel clones support out of order store. wmb() ceases to be a
109 * nop for these.
110 */
111
112 #define mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
113 #define rmb() mb()
114 #define wmb() mb();
115
116
117 /*
118 * Talk about misusing macros..
119 */
120
121 #define __OUT1(s,x) \
122 extern void __out##s(unsigned x value, unsigned short port); \
123 extern __GNU_INLINE \
124 void __out##s(unsigned x value, unsigned short port) {
125
126 #define __OUT2(s,s1,s2) \
127 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
128
129 #define __OUT(s,s1,x) \
130 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
131 __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
132 __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
133 __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
134
135 #define __IN1(s,x) \
136 extern unsigned x __in##s(unsigned short port); \
137 extern __GNU_INLINE \
138 unsigned x __in##s(unsigned short port) { unsigned x _v;
139
140 #define __IN2(s,s1,s2) \
141 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
142
143 #define __IN(s,s1,x,i...) \
144 __IN1(s,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
145 __IN1(s##c,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
146 __IN1(s##_p,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
147 __IN1(s##c_p,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
148
149 #define __INS(s) \
150 extern void ins##s(unsigned short port, void * addr, unsigned long count); \
151 extern __GNU_INLINE \
152 void ins##s(unsigned short port, void * addr, unsigned long count) \
153 { __asm__ __volatile__ ("cld ; rep ; ins" #s \
154 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
155
156 #define __OUTS(s) \
157 extern void outs##s(unsigned short port, const void * addr, unsigned long count); \
158 extern __GNU_INLINE \
159 void outs##s(unsigned short port, const void * addr, unsigned long count) \
160 { __asm__ __volatile__ ("cld ; rep ; outs" #s \
161 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
162
163 __IN(b,"", char)
164 __IN(w,"",short)
165 __IN(l,"", long)
166
167 __OUT(b,"b",char)
168 __OUT(w,"w",short)
169 __OUT(l,,int)
170
171 __INS(b)
172 __INS(w)
173 __INS(l)
174
175 __OUTS(b)
176 __OUTS(w)
177 __OUTS(l)
178
179 /*
180 * Note that due to the way __builtin_constant_p() works, you
181 * - can't use it inside a inline function (it will never be true)
182 * - you don't have to worry about side effects within the __builtin..
183 */
184 #define outb(val,port) \
185 ((__builtin_constant_p((port)) && (port) < 256) ? \
186 __outbc((val),(port)) : \
187 __outb((val),(port)))
188
189 #define inb(port) \
190 ((__builtin_constant_p((port)) && (port) < 256) ? \
191 __inbc(port) : \
192 __inb(port))
193
194 #define outb_p(val,port) \
195 ((__builtin_constant_p((port)) && (port) < 256) ? \
196 __outbc_p((val),(port)) : \
197 __outb_p((val),(port)))
198
199 #define inb_p(port) \
200 ((__builtin_constant_p((port)) && (port) < 256) ? \
201 __inbc_p(port) : \
202 __inb_p(port))
203
204 #define outw(val,port) \
205 ((__builtin_constant_p((port)) && (port) < 256) ? \
206 __outwc((val),(port)) : \
207 __outw((val),(port)))
208
209 #define inw(port) \
210 ((__builtin_constant_p((port)) && (port) < 256) ? \
211 __inwc(port) : \
212 __inw(port))
213
214 #define outw_p(val,port) \
215 ((__builtin_constant_p((port)) && (port) < 256) ? \
216 __outwc_p((val),(port)) : \
217 __outw_p((val),(port)))
218
219 #define inw_p(port) \
220 ((__builtin_constant_p((port)) && (port) < 256) ? \
221 __inwc_p(port) : \
222 __inw_p(port))
223
224 #define outl(val,port) \
225 ((__builtin_constant_p((port)) && (port) < 256) ? \
226 __outlc((val),(port)) : \
227 __outl((val),(port)))
228
229 #define inl(port) \
230 ((__builtin_constant_p((port)) && (port) < 256) ? \
231 __inlc(port) : \
232 __inl(port))
233
234 #define outl_p(val,port) \
235 ((__builtin_constant_p((port)) && (port) < 256) ? \
236 __outlc_p((val),(port)) : \
237 __outl_p((val),(port)))
238
239 #define inl_p(port) \
240 ((__builtin_constant_p((port)) && (port) < 256) ? \
241 __inlc_p(port) : \
242 __inl_p(port))
243
244 #endif /* ETHERBOOT_IO_H */