source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/io.h @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 11.4 KB
Line 
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#include <asm/fixmap.h>
51
52/*
53 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
54 * access
55 */
56#define xlate_dev_mem_ptr(p, sz)        ioremap(p, sz)
57#define xlate_dev_mem_ptr_unmap(p)      iounmap(p)
58
59/*
60 * Convert a virtual cached pointer to an uncached pointer
61 */
62#define xlate_dev_kmem_ptr(p)   p
63
64/**
65 *      virt_to_phys    -       map virtual addresses to physical
66 *      @address: address to remap
67 *
68 *      The returned physical address is the physical (CPU) mapping for
69 *      the memory address given. It is only valid to use this function on
70 *      addresses directly mapped or allocated via kmalloc.
71 *
72 *      This function does not give bus mappings for DMA transfers. In
73 *      almost all conceivable cases a device driver should not be using
74 *      this function
75 */
76 
77static inline unsigned long virt_to_phys(volatile void * address)
78{
79        return __pa(address);
80}
81
82/**
83 *      phys_to_virt    -       map physical address to virtual
84 *      @address: address to remap
85 *
86 *      The returned virtual address is a current CPU mapping for
87 *      the memory address given. It is only valid to use this function on
88 *      addresses that have a kernel mapping
89 *
90 *      This function does not handle bus mappings for DMA transfers. In
91 *      almost all conceivable cases a device driver should not be using
92 *      this function
93 */
94
95static inline void * phys_to_virt(unsigned long address)
96{
97        return __va(address);
98}
99
100/*
101 * Change "struct page" to physical address.
102 */
103#define page_to_pseudophys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
104#define page_to_phys(page)       (phys_to_machine(page_to_pseudophys(page)))
105#define page_to_bus(page)        (phys_to_machine(page_to_pseudophys(page)))
106
107#define bio_to_pseudophys(bio)   (page_to_pseudophys(bio_page((bio))) + \
108                                  (unsigned long) bio_offset((bio)))
109#define bvec_to_pseudophys(bv)   (page_to_pseudophys((bv)->bv_page) + \
110                                  (unsigned long) (bv)->bv_offset)
111
112#define BIOVEC_PHYS_MERGEABLE(vec1, vec2)       \
113        (((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) && \
114         ((bvec_to_pseudophys((vec1)) + (vec1)->bv_len) == \
115          bvec_to_pseudophys((vec2))))
116
117extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
118
119/**
120 * ioremap     -   map bus memory into CPU space
121 * @offset:    bus address of the memory
122 * @size:      size of the resource to map
123 *
124 * ioremap performs a platform specific sequence of operations to
125 * make bus memory CPU accessible via the readb/readw/readl/writeb/
126 * writew/writel functions and the other mmio helpers. The returned
127 * address is not guaranteed to be usable directly as a virtual
128 * address.
129 */
130
131static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
132{
133        return __ioremap(offset, size, 0);
134}
135
136extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
137extern void iounmap(volatile void __iomem *addr);
138
139/*
140 * bt_ioremap() and bt_iounmap() are for temporary early boot-time
141 * mappings, before the real ioremap() is functional.
142 * A boot-time mapping is currently limited to at most 16 pages.
143 */
144extern void *bt_ioremap(unsigned long offset, unsigned long size);
145extern void bt_iounmap(void *addr, unsigned long size);
146
147/* Use early IO mappings for DMI because it's initialized early */
148#define dmi_ioremap bt_ioremap
149#define dmi_iounmap bt_iounmap
150#define dmi_alloc alloc_bootmem
151
152/*
153 * ISA I/O bus memory addresses are 1:1 with the physical address.
154 */
155#define isa_virt_to_bus(_x) isa_virt_to_bus_is_UNSUPPORTED->x
156#define isa_page_to_bus(_x) isa_page_to_bus_is_UNSUPPORTED->x
157#define isa_bus_to_virt(_x) (void *)(__fix_to_virt(FIX_ISAMAP_BEGIN) + (_x))
158
159/*
160 * However PCI ones are not necessarily 1:1 and therefore these interfaces
161 * are forbidden in portable PCI drivers.
162 *
163 * Allow them on x86 for legacy drivers, though.
164 */
165#define virt_to_bus(_x) phys_to_machine(__pa(_x))
166#define bus_to_virt(_x) __va(machine_to_phys(_x))
167
168/*
169 * readX/writeX() are used to access memory mapped devices. On some
170 * architectures the memory mapped IO stuff needs to be accessed
171 * differently. On the x86 architecture, we just read/write the
172 * memory location directly.
173 */
174
175static inline unsigned char readb(const volatile void __iomem *addr)
176{
177        return *(volatile unsigned char __force *) addr;
178}
179static inline unsigned short readw(const volatile void __iomem *addr)
180{
181        return *(volatile unsigned short __force *) addr;
182}
183static inline unsigned int readl(const volatile void __iomem *addr)
184{
185        return *(volatile unsigned int __force *) addr;
186}
187#define readb_relaxed(addr) readb(addr)
188#define readw_relaxed(addr) readw(addr)
189#define readl_relaxed(addr) readl(addr)
190#define __raw_readb readb
191#define __raw_readw readw
192#define __raw_readl readl
193
194static inline void writeb(unsigned char b, volatile void __iomem *addr)
195{
196        *(volatile unsigned char __force *) addr = b;
197}
198static inline void writew(unsigned short b, volatile void __iomem *addr)
199{
200        *(volatile unsigned short __force *) addr = b;
201}
202static inline void writel(unsigned int b, volatile void __iomem *addr)
203{
204        *(volatile unsigned int __force *) addr = b;
205}
206#define __raw_writeb writeb
207#define __raw_writew writew
208#define __raw_writel writel
209
210#define mmiowb()
211
212static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
213{
214        memset((void __force *) addr, val, count);
215}
216static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
217{
218        __memcpy(dst, (void __force *) src, count);
219}
220static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
221{
222        __memcpy((void __force *) dst, src, count);
223}
224
225/*
226 * ISA space is 'always mapped' on a typical x86 system, no need to
227 * explicitly ioremap() it. The fact that the ISA IO space is mapped
228 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
229 * are physical addresses. The following constant pointer can be
230 * used as the IO-area pointer (it can be iounmapped as well, so the
231 * analogy with PCI is quite large):
232 */
233#define __ISA_IO_base ((char __iomem *)(fix_to_virt(FIX_ISAMAP_BEGIN)))
234
235/*
236 * Again, i386 does not require mem IO specific function.
237 */
238
239#define eth_io_copy_and_sum(a,b,c,d)            eth_copy_and_sum((a),(void __force *)(b),(c),(d))
240
241/**
242 *      check_signature         -       find BIOS signatures
243 *      @io_addr: mmio address to check
244 *      @signature:  signature block
245 *      @length: length of signature
246 *
247 *      Perform a signature comparison with the mmio address io_addr. This
248 *      address should have been obtained by ioremap.
249 *      Returns 1 on a match.
250 */
251 
252static inline int check_signature(volatile void __iomem * io_addr,
253        const unsigned char *signature, int length)
254{
255        int retval = 0;
256        do {
257                if (readb(io_addr) != *signature)
258                        goto out;
259                io_addr++;
260                signature++;
261                length--;
262        } while (length);
263        retval = 1;
264out:
265        return retval;
266}
267
268/*
269 *      Cache management
270 *
271 *      This needed for two cases
272 *      1. Out of order aware processors
273 *      2. Accidentally out of order processors (PPro errata #51)
274 */
275 
276#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
277
278static inline void flush_write_buffers(void)
279{
280        __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
281}
282
283#define dma_cache_inv(_start,_size)             flush_write_buffers()
284#define dma_cache_wback(_start,_size)           flush_write_buffers()
285#define dma_cache_wback_inv(_start,_size)       flush_write_buffers()
286
287#else
288
289/* Nothing to do */
290
291#define dma_cache_inv(_start,_size)             do { } while (0)
292#define dma_cache_wback(_start,_size)           do { } while (0)
293#define dma_cache_wback_inv(_start,_size)       do { } while (0)
294#define flush_write_buffers()
295
296#endif
297
298#endif /* __KERNEL__ */
299
300#ifdef SLOW_IO_BY_JUMPING
301#define __SLOW_DOWN_IO "jmp 1f; 1: jmp 1f; 1:"
302#else
303#define __SLOW_DOWN_IO "outb %%al,$0x80;"
304#endif
305
306static inline void slow_down_io(void) {
307        __asm__ __volatile__(
308                __SLOW_DOWN_IO
309#ifdef REALLY_SLOW_IO
310                __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
311#endif
312                : : );
313}
314
315#ifdef CONFIG_X86_NUMAQ
316extern void *xquad_portio;    /* Where the IO area was mapped */
317#define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
318#define __BUILDIO(bwl,bw,type) \
319static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
320        if (xquad_portio) \
321                write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
322        else \
323                out##bwl##_local(value, port); \
324} \
325static inline void out##bwl(unsigned type value, int port) { \
326        out##bwl##_quad(value, port, 0); \
327} \
328static inline unsigned type in##bwl##_quad(int port, int quad) { \
329        if (xquad_portio) \
330                return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
331        else \
332                return in##bwl##_local(port); \
333} \
334static inline unsigned type in##bwl(int port) { \
335        return in##bwl##_quad(port, 0); \
336}
337#else
338#define __BUILDIO(bwl,bw,type) \
339static inline void out##bwl(unsigned type value, int port) { \
340        out##bwl##_local(value, port); \
341} \
342static inline unsigned type in##bwl(int port) { \
343        return in##bwl##_local(port); \
344}
345#endif
346
347
348#define BUILDIO(bwl,bw,type) \
349static inline void out##bwl##_local(unsigned type value, int port) { \
350        __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
351} \
352static inline unsigned type in##bwl##_local(int port) { \
353        unsigned type value; \
354        __asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \
355        return value; \
356} \
357static inline void out##bwl##_local_p(unsigned type value, int port) { \
358        out##bwl##_local(value, port); \
359        slow_down_io(); \
360} \
361static inline unsigned type in##bwl##_local_p(int port) { \
362        unsigned type value = in##bwl##_local(port); \
363        slow_down_io(); \
364        return value; \
365} \
366__BUILDIO(bwl,bw,type) \
367static inline void out##bwl##_p(unsigned type value, int port) { \
368        out##bwl(value, port); \
369        slow_down_io(); \
370} \
371static inline unsigned type in##bwl##_p(int port) { \
372        unsigned type value = in##bwl(port); \
373        slow_down_io(); \
374        return value; \
375} \
376static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
377        __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
378} \
379static inline void ins##bwl(int port, void *addr, unsigned long count) { \
380        __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \
381}
382
383BUILDIO(b,b,char)
384BUILDIO(w,w,short)
385BUILDIO(l,,int)
386
387/* We will be supplying our own /dev/mem implementation */
388#define ARCH_HAS_DEV_MEM
389
390#endif
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