x86: cleanup e820_setup_gap(), add e820_search_gap(), v2
[linux-2.6] / include / asm-x86 / io_32.h
1 #ifndef _ASM_IO_H
2 #define _ASM_IO_H
3
4 #include <linux/string.h>
5 #include <linux/compiler.h>
6
7 /*
8  * This file contains the definitions for the x86 IO instructions
9  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
10  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
11  * versions of the single-IO instructions (inb_p/inw_p/..).
12  *
13  * This file is not meant to be obfuscating: it's just complicated
14  * to (a) handle it all in a way that makes gcc able to optimize it
15  * as well as possible and (b) trying to avoid writing the same thing
16  * over and over again with slight variations and possibly making a
17  * mistake somewhere.
18  */
19
20 /*
21  * Thanks to James van Artsdalen for a better timing-fix than
22  * the two short jumps: using outb's to a nonexistent port seems
23  * to guarantee better timings even on fast machines.
24  *
25  * On the other hand, I'd like to be sure of a non-existent port:
26  * I feel a bit unsafe about using 0x80 (should be safe, though)
27  *
28  *              Linus
29  */
30
31  /*
32   *  Bit simplified and optimized by Jan Hubicka
33   *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
34   *
35   *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
36   *  isa_read[wl] and isa_write[wl] fixed
37   *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
38   */
39
40 #define IO_SPACE_LIMIT 0xffff
41
42 #define XQUAD_PORTIO_BASE 0xfe400000
43 #define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */
44
45 #ifdef __KERNEL__
46
47 #include <asm-generic/iomap.h>
48
49 #include <linux/vmalloc.h>
50
51 /*
52  * Convert a virtual cached pointer to an uncached pointer
53  */
54 #define xlate_dev_kmem_ptr(p)   p
55
56 /**
57  *      virt_to_phys    -       map virtual addresses to physical
58  *      @address: address to remap
59  *
60  *      The returned physical address is the physical (CPU) mapping for
61  *      the memory address given. It is only valid to use this function on
62  *      addresses directly mapped or allocated via kmalloc.
63  *
64  *      This function does not give bus mappings for DMA transfers. In
65  *      almost all conceivable cases a device driver should not be using
66  *      this function
67  */
68
69 static inline unsigned long virt_to_phys(volatile void *address)
70 {
71         return __pa(address);
72 }
73
74 /**
75  *      phys_to_virt    -       map physical address to virtual
76  *      @address: address to remap
77  *
78  *      The returned virtual address is a current CPU mapping for
79  *      the memory address given. It is only valid to use this function on
80  *      addresses that have a kernel mapping
81  *
82  *      This function does not handle bus mappings for DMA transfers. In
83  *      almost all conceivable cases a device driver should not be using
84  *      this function
85  */
86
87 static inline void *phys_to_virt(unsigned long address)
88 {
89         return __va(address);
90 }
91
92 /*
93  * Change "struct page" to physical address.
94  */
95 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
96
97 /**
98  * ioremap     -   map bus memory into CPU space
99  * @offset:    bus address of the memory
100  * @size:      size of the resource to map
101  *
102  * ioremap performs a platform specific sequence of operations to
103  * make bus memory CPU accessible via the readb/readw/readl/writeb/
104  * writew/writel functions and the other mmio helpers. The returned
105  * address is not guaranteed to be usable directly as a virtual
106  * address.
107  *
108  * If the area you are trying to map is a PCI BAR you should have a
109  * look at pci_iomap().
110  */
111 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
112 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
113
114 /*
115  * The default ioremap() behavior is non-cached:
116  */
117 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
118 {
119         return ioremap_nocache(offset, size);
120 }
121
122 extern void iounmap(volatile void __iomem *addr);
123
124 /*
125  * ISA I/O bus memory addresses are 1:1 with the physical address.
126  */
127 #define isa_virt_to_bus virt_to_phys
128 #define isa_page_to_bus page_to_phys
129 #define isa_bus_to_virt phys_to_virt
130
131 /*
132  * However PCI ones are not necessarily 1:1 and therefore these interfaces
133  * are forbidden in portable PCI drivers.
134  *
135  * Allow them on x86 for legacy drivers, though.
136  */
137 #define virt_to_bus virt_to_phys
138 #define bus_to_virt phys_to_virt
139
140 static inline void
141 memset_io(volatile void __iomem *addr, unsigned char val, int count)
142 {
143         memset((void __force *)addr, val, count);
144 }
145
146 static inline void
147 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
148 {
149         __memcpy(dst, (const void __force *)src, count);
150 }
151
152 static inline void
153 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
154 {
155         __memcpy((void __force *)dst, src, count);
156 }
157
158 /*
159  * ISA space is 'always mapped' on a typical x86 system, no need to
160  * explicitly ioremap() it. The fact that the ISA IO space is mapped
161  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
162  * are physical addresses. The following constant pointer can be
163  * used as the IO-area pointer (it can be iounmapped as well, so the
164  * analogy with PCI is quite large):
165  */
166 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
167
168 /*
169  *      Cache management
170  *
171  *      This needed for two cases
172  *      1. Out of order aware processors
173  *      2. Accidentally out of order processors (PPro errata #51)
174  */
175
176 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
177
178 static inline void flush_write_buffers(void)
179 {
180         asm volatile("lock; addl $0,0(%%esp)": : :"memory");
181 }
182
183 #else
184
185 #define flush_write_buffers() do { } while (0)
186
187 #endif
188
189 #endif /* __KERNEL__ */
190
191 extern void native_io_delay(void);
192
193 extern int io_delay_type;
194 extern void io_delay_init(void);
195
196 #if defined(CONFIG_PARAVIRT)
197 #include <asm/paravirt.h>
198 #else
199
200 static inline void slow_down_io(void)
201 {
202         native_io_delay();
203 #ifdef REALLY_SLOW_IO
204         native_io_delay();
205         native_io_delay();
206         native_io_delay();
207 #endif
208 }
209
210 #endif
211
212 #define __BUILDIO(bwl, bw, type)                                \
213 static inline void out##bwl(unsigned type value, int port)      \
214 {                                                               \
215         out##bwl##_local(value, port);                          \
216 }                                                               \
217                                                                 \
218 static inline unsigned type in##bwl(int port)                   \
219 {                                                               \
220         return in##bwl##_local(port);                           \
221 }
222
223 #define BUILDIO(bwl, bw, type)                                          \
224 static inline void out##bwl##_local(unsigned type value, int port)      \
225 {                                                                       \
226         asm volatile("out" #bwl " %" #bw "0, %w1"               \
227                      : : "a"(value), "Nd"(port));                       \
228 }                                                                       \
229                                                                         \
230 static inline unsigned type in##bwl##_local(int port)                   \
231 {                                                                       \
232         unsigned type value;                                            \
233         asm volatile("in" #bwl " %w1, %" #bw "0"                \
234                      : "=a"(value) : "Nd"(port));                       \
235         return value;                                                   \
236 }                                                                       \
237                                                                         \
238 static inline void out##bwl##_local_p(unsigned type value, int port)    \
239 {                                                                       \
240         out##bwl##_local(value, port);                                  \
241         slow_down_io();                                                 \
242 }                                                                       \
243                                                                         \
244 static inline unsigned type in##bwl##_local_p(int port)                 \
245 {                                                                       \
246         unsigned type value = in##bwl##_local(port);                    \
247         slow_down_io();                                                 \
248         return value;                                                   \
249 }                                                                       \
250                                                                         \
251 __BUILDIO(bwl, bw, type)                                                \
252                                                                         \
253 static inline void out##bwl##_p(unsigned type value, int port)          \
254 {                                                                       \
255         out##bwl(value, port);                                          \
256         slow_down_io();                                                 \
257 }                                                                       \
258                                                                         \
259 static inline unsigned type in##bwl##_p(int port)                       \
260 {                                                                       \
261         unsigned type value = in##bwl(port);                            \
262         slow_down_io();                                                 \
263         return value;                                                   \
264 }                                                                       \
265                                                                         \
266 static inline void outs##bwl(int port, const void *addr, unsigned long count) \
267 {                                                                       \
268         asm volatile("rep; outs" #bwl                                   \
269                      : "+S"(addr), "+c"(count) : "d"(port));            \
270 }                                                                       \
271                                                                         \
272 static inline void ins##bwl(int port, void *addr, unsigned long count)  \
273 {                                                                       \
274         asm volatile("rep; ins" #bwl                                    \
275                      : "+D"(addr), "+c"(count) : "d"(port));            \
276 }
277
278 BUILDIO(b, b, char)
279 BUILDIO(w, w, short)
280 BUILDIO(l, , int)
281
282 #endif