summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/io_64.h
blob: fea325a1122f4abf66d340113a9a82787a75832f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
#ifndef _ASM_X86_IO_64_H
#define _ASM_X86_IO_64_H


/*
 * This file contains the definitions for the x86 IO instructions
 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
 * versions of the single-IO instructions (inb_p/inw_p/..).
 *
 * This file is not meant to be obfuscating: it's just complicated
 * to (a) handle it all in a way that makes gcc able to optimize it
 * as well as possible and (b) trying to avoid writing the same thing
 * over and over again with slight variations and possibly making a
 * mistake somewhere.
 */

/*
 * Thanks to James van Artsdalen for a better timing-fix than
 * the two short jumps: using outb's to a nonexistent port seems
 * to guarantee better timings even on fast machines.
 *
 * On the other hand, I'd like to be sure of a non-existent port:
 * I feel a bit unsafe about using 0x80 (should be safe, though)
 *
 *		Linus
 */

 /*
  *  Bit simplified and optimized by Jan Hubicka
  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
  *
  *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
  *  isa_read[wl] and isa_write[wl] fixed
  *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  */

extern void native_io_delay(void);

extern int io_delay_type;
extern void io_delay_init(void);

#if defined(CONFIG_PARAVIRT)
#include <asm/paravirt.h>
#else

static inline void slow_down_io(void)
{
	native_io_delay();
#ifdef REALLY_SLOW_IO
	native_io_delay();
	native_io_delay();
	native_io_delay();
#endif
}
#endif

/*
 * Talk about misusing macros..
 */
#define __OUT1(s, x)							\
static inline void out##s(unsigned x value, unsigned short port) {

#define __OUT2(s, s1, s2)				\
asm volatile ("out" #s " %" s1 "0,%" s2 "1"

#ifndef REALLY_SLOW_IO
#define REALLY_SLOW_IO
#define UNSET_REALLY_SLOW_IO
#endif

#define __OUT(s, s1, x)							\
	__OUT1(s, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port));	\
	}								\
	__OUT1(s##_p, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
	slow_down_io();							\
}

#define __IN1(s)							\
static inline RETURN_TYPE in##s(unsigned short port)			\
{									\
	RETURN_TYPE _v;

#define __IN2(s, s1, s2)						\
	asm volatile ("in" #s " %" s2 "1,%" s1 "0"

#define __IN(s, s1, i...)						\
	__IN1(s) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i);	\
	return _v;							\
	}								\
	__IN1(s##_p) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i);	\
	slow_down_io(); \
	return _v; }

#ifdef UNSET_REALLY_SLOW_IO
#undef REALLY_SLOW_IO
#endif

#define __INS(s)							\
static inline void ins##s(unsigned short port, void *addr,		\
			  unsigned long count)				\
{									\
	asm volatile ("rep ; ins" #s					\
		      : "=D" (addr), "=c" (count)			\
		      : "d" (port), "0" (addr), "1" (count));		\
}

#define __OUTS(s)							\
static inline void outs##s(unsigned short port, const void *addr,	\
			   unsigned long count)				\
{									\
	asm volatile ("rep ; outs" #s					\
		      : "=S" (addr), "=c" (count)			\
		      : "d" (port), "0" (addr), "1" (count));		\
}

#define RETURN_TYPE unsigned char
__IN(b, "")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned short
__IN(w, "")
#undef RETURN_TYPE
#define RETURN_TYPE unsigned int
__IN(l, "")
#undef RETURN_TYPE

__OUT(b, "b", char)
__OUT(w, "w", short)
__OUT(l, , int)

__INS(b)
__INS(w)
__INS(l)

__OUTS(b)
__OUTS(w)
__OUTS(l)

#define IO_SPACE_LIMIT 0xffff

#if defined(__KERNEL__) && defined(__x86_64__)

#include <linux/vmalloc.h>

#ifndef __i386__
/*
 * Change virtual addresses to physical addresses and vv.
 * These are pretty trivial
 */
static inline unsigned long virt_to_phys(volatile void *address)
{
	return __pa(address);
}

static inline void *phys_to_virt(unsigned long address)
{
	return __va(address);
}
#endif

/*
 * Change "struct page" to physical address.
 */
#define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)

#include <asm-generic/iomap.h>

/*
 * This one maps high address device memory and turns off caching for that area.
 * it's useful if some control registers are in such an area and write combining
 * or read caching is not desirable:
 */
extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
				unsigned long prot_val);

/*
 * The default ioremap() behavior is non-cached:
 */
static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
{
	return ioremap_nocache(offset, size);
}

extern void iounmap(volatile void __iomem *addr);

extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);

/*
 * ISA I/O bus memory addresses are 1:1 with the physical address.
 */
#define isa_virt_to_bus virt_to_phys
#define isa_page_to_bus page_to_phys
#define isa_bus_to_virt phys_to_virt

/*
 * However PCI ones are not necessarily 1:1 and therefore these interfaces
 * are forbidden in portable PCI drivers.
 *
 * Allow them on x86 for legacy drivers, though.
 */
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt

void __memcpy_fromio(void *, unsigned long, unsigned);
void __memcpy_toio(unsigned long, const void *, unsigned);

static inline void memcpy_fromio(void *to, const volatile void __iomem *from,
				 unsigned len)
{
	__memcpy_fromio(to, (unsigned long)from, len);
}

static inline void memcpy_toio(volatile void __iomem *to, const void *from,
			       unsigned len)
{
	__memcpy_toio((unsigned long)to, from, len);
}

void memset_io(volatile void __iomem *a, int b, size_t c);

/*
 * ISA space is 'always mapped' on a typical x86 system, no need to
 * explicitly ioremap() it. The fact that the ISA IO space is mapped
 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 * are physical addresses. The following constant pointer can be
 * used as the IO-area pointer (it can be iounmapped as well, so the
 * analogy with PCI is quite large):
 */
#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))

#define flush_write_buffers()

#define BIO_VMERGE_BOUNDARY iommu_bio_merge

/*
 * Convert a virtual cached pointer to an uncached pointer
 */
#define xlate_dev_kmem_ptr(p)	p

#endif /* __KERNEL__ */

#endif /* _ASM_X86_IO_64_H */
OpenPOWER on IntegriCloud