1#ifndef _ASM_IO_H
2#define _ASM_IO_H
3
4
5/*
6 * This file contains the definitions for the x86 IO instructions
7 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
8 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
9 * versions of the single-IO instructions (inb_p/inw_p/..).
10 *
11 * This file is not meant to be obfuscating: it's just complicated
12 * to (a) handle it all in a way that makes gcc able to optimize it
13 * as well as possible and (b) trying to avoid writing the same thing
14 * over and over again with slight variations and possibly making a
15 * mistake somewhere.
16 */
17
18/*
19 * Thanks to James van Artsdalen for a better timing-fix than
20 * the two short jumps: using outb's to a nonexistent port seems
21 * to guarantee better timings even on fast machines.
22 *
23 * On the other hand, I'd like to be sure of a non-existent port:
24 * I feel a bit unsafe about using 0x80 (should be safe, though)
25 *
26 *		Linus
27 */
28
29 /*
30  *  Bit simplified and optimized by Jan Hubicka
31  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
32  *
33  *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
34  *  isa_read[wl] and isa_write[wl] fixed
35  *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
36  */
37
38#define __SLOW_DOWN_IO "\noutb %%al,$0x80"
39
40#ifdef REALLY_SLOW_IO
41#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
42#else
43#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
44#endif
45
46/*
47 * Talk about misusing macros..
48 */
49#define __OUT1(s,x) \
50static inline void out##s(unsigned x value, unsigned short port) {
51
52#define __OUT2(s,s1,s2) \
53__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
54
55#define __OUT(s,s1,x) \
56__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
57__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
58
59#define __IN1(s) \
60static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
61
62#define __IN2(s,s1,s2) \
63__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
64
65#define __IN(s,s1,i...) \
66__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
67__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
68
69#define __INS(s) \
70static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
71{ __asm__ __volatile__ ("rep ; ins" #s \
72: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
73
74#define __OUTS(s) \
75static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
76{ __asm__ __volatile__ ("rep ; outs" #s \
77: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
78
79#define RETURN_TYPE unsigned char
80__IN(b,"")
81#undef RETURN_TYPE
82#define RETURN_TYPE unsigned short
83__IN(w,"")
84#undef RETURN_TYPE
85#define RETURN_TYPE unsigned int
86__IN(l,"")
87#undef RETURN_TYPE
88
89__OUT(b,"b",char)
90__OUT(w,"w",short)
91__OUT(l,,int)
92
93__INS(b)
94__INS(w)
95__INS(l)
96
97__OUTS(b)
98__OUTS(w)
99__OUTS(l)
100
101#define IO_SPACE_LIMIT 0xffff
102
103#if defined(__KERNEL__) && defined(__x86_64__)
104
105#include <linux/vmalloc.h>
106
107#ifndef __i386__
108/*
109 * Change virtual addresses to physical addresses and vv.
110 * These are pretty trivial
111 */
112static inline unsigned long virt_to_phys(volatile void * address)
113{
114	return __pa(address);
115}
116
117static inline void * phys_to_virt(unsigned long address)
118{
119	return __va(address);
120}
121#endif
122
123/*
124 * Change "struct page" to physical address.
125 */
126#define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
127
128#include <asm-generic/iomap.h>
129
130extern void __iomem *__ioremap(unsigned long offset, unsigned long size, unsigned long flags);
131
132static inline void __iomem * ioremap (unsigned long offset, unsigned long size)
133{
134	return __ioremap(offset, size, 0);
135}
136
137extern void *early_ioremap(unsigned long addr, unsigned long size);
138extern void early_iounmap(void *addr, unsigned long size);
139
140/*
141 * This one maps high address device memory and turns off caching for that area.
142 * it's useful if some control registers are in such an area and write combining
143 * or read caching is not desirable:
144 */
145extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
146extern void iounmap(volatile void __iomem *addr);
147
148/*
149 * ISA I/O bus memory addresses are 1:1 with the physical address.
150 */
151#define isa_virt_to_bus virt_to_phys
152#define isa_page_to_bus page_to_phys
153#define isa_bus_to_virt phys_to_virt
154
155/*
156 * However PCI ones are not necessarily 1:1 and therefore these interfaces
157 * are forbidden in portable PCI drivers.
158 *
159 * Allow them on x86 for legacy drivers, though.
160 */
161#define virt_to_bus virt_to_phys
162#define bus_to_virt phys_to_virt
163
164/*
165 * readX/writeX() are used to access memory mapped devices. On some
166 * architectures the memory mapped IO stuff needs to be accessed
167 * differently. On the x86 architecture, we just read/write the
168 * memory location directly.
169 */
170
171static inline __u8 __readb(const volatile void __iomem *addr)
172{
173	return *(__force volatile __u8 *)addr;
174}
175static inline __u16 __readw(const volatile void __iomem *addr)
176{
177	return *(__force volatile __u16 *)addr;
178}
179static __always_inline __u32 __readl(const volatile void __iomem *addr)
180{
181	return *(__force volatile __u32 *)addr;
182}
183static inline __u64 __readq(const volatile void __iomem *addr)
184{
185	return *(__force volatile __u64 *)addr;
186}
187#define readb(x) __readb(x)
188#define readw(x) __readw(x)
189#define readl(x) __readl(x)
190#define readq(x) __readq(x)
191#define readb_relaxed(a) readb(a)
192#define readw_relaxed(a) readw(a)
193#define readl_relaxed(a) readl(a)
194#define readq_relaxed(a) readq(a)
195#define __raw_readb readb
196#define __raw_readw readw
197#define __raw_readl readl
198#define __raw_readq readq
199
200#define mmiowb()
201
202static inline void __writel(__u32 b, volatile void __iomem *addr)
203{
204	*(__force volatile __u32 *)addr = b;
205}
206static inline void __writeq(__u64 b, volatile void __iomem *addr)
207{
208	*(__force volatile __u64 *)addr = b;
209}
210static inline void __writeb(__u8 b, volatile void __iomem *addr)
211{
212	*(__force volatile __u8 *)addr = b;
213}
214static inline void __writew(__u16 b, volatile void __iomem *addr)
215{
216	*(__force volatile __u16 *)addr = b;
217}
218#define writeq(val,addr) __writeq((val),(addr))
219#define writel(val,addr) __writel((val),(addr))
220#define writew(val,addr) __writew((val),(addr))
221#define writeb(val,addr) __writeb((val),(addr))
222#define __raw_writeb writeb
223#define __raw_writew writew
224#define __raw_writel writel
225#define __raw_writeq writeq
226
227void __memcpy_fromio(void*,unsigned long,unsigned);
228void __memcpy_toio(unsigned long,const void*,unsigned);
229
230static inline void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned len)
231{
232	__memcpy_fromio(to,(unsigned long)from,len);
233}
234static inline void memcpy_toio(volatile void __iomem *to, const void *from, unsigned len)
235{
236	__memcpy_toio((unsigned long)to,from,len);
237}
238
239void memset_io(volatile void __iomem *a, int b, size_t c);
240
241/*
242 * ISA space is 'always mapped' on a typical x86 system, no need to
243 * explicitly ioremap() it. The fact that the ISA IO space is mapped
244 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
245 * are physical addresses. The following constant pointer can be
246 * used as the IO-area pointer (it can be iounmapped as well, so the
247 * analogy with PCI is quite large):
248 */
249#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
250
251/* Nothing to do */
252
253#define dma_cache_inv(_start,_size)		do { } while (0)
254#define dma_cache_wback(_start,_size)		do { } while (0)
255#define dma_cache_wback_inv(_start,_size)	do { } while (0)
256
257#define flush_write_buffers()
258
259extern int iommu_bio_merge;
260#define BIO_VMERGE_BOUNDARY iommu_bio_merge
261
262/*
263 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
264 * access
265 */
266#define xlate_dev_mem_ptr(p)	__va(p)
267
268/*
269 * Convert a virtual cached pointer to an uncached pointer
270 */
271#define xlate_dev_kmem_ptr(p)	p
272
273#endif /* __KERNEL__ */
274
275#endif
276