4 #include <linux/config.h>
5 #include <linux/string.h>
6 #include <linux/compiler.h>
9 * This file contains the definitions for the x86 IO instructions
10 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
11 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
12 * versions of the single-IO instructions (inb_p/inw_p/..).
14 * This file is not meant to be obfuscating: it's just complicated
15 * to (a) handle it all in a way that makes gcc able to optimize it
16 * as well as possible and (b) trying to avoid writing the same thing
17 * over and over again with slight variations and possibly making a
22 * Thanks to James van Artsdalen for a better timing-fix than
23 * the two short jumps: using outb's to a nonexistent port seems
24 * to guarantee better timings even on fast machines.
26 * On the other hand, I'd like to be sure of a non-existent port:
27 * I feel a bit unsafe about using 0x80 (should be safe, though)
33 * Bit simplified and optimized by Jan Hubicka
34 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
36 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
37 * isa_read[wl] and isa_write[wl] fixed
38 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
41 #define IO_SPACE_LIMIT 0xffff
43 #define XQUAD_PORTIO_BASE 0xfe400000
44 #define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
48 #include <asm-generic/iomap.h>
50 #include <linux/vmalloc.h>
53 * virt_to_phys - map virtual addresses to physical
54 * @address: address to remap
56 * The returned physical address is the physical (CPU) mapping for
57 * the memory address given. It is only valid to use this function on
58 * addresses directly mapped or allocated via kmalloc.
60 * This function does not give bus mappings for DMA transfers. In
61 * almost all conceivable cases a device driver should not be using
65 static inline unsigned long virt_to_phys(volatile void * address)
71 * phys_to_virt - map physical address to virtual
72 * @address: address to remap
74 * The returned virtual address is a current CPU mapping for
75 * the memory address given. It is only valid to use this function on
76 * addresses that have a kernel mapping
78 * This function does not handle bus mappings for DMA transfers. In
79 * almost all conceivable cases a device driver should not be using
83 static inline void * phys_to_virt(unsigned long address)
89 * Change "struct page" to physical address.
91 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
93 extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
96 * ioremap - map bus memory into CPU space
97 * @offset: bus address of the memory
98 * @size: size of the resource to map
100 * ioremap performs a platform specific sequence of operations to
101 * make bus memory CPU accessible via the readb/readw/readl/writeb/
102 * writew/writel functions and the other mmio helpers. The returned
103 * address is not guaranteed to be usable directly as a virtual
107 static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
109 return __ioremap(offset, size, 0);
112 extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
113 extern void iounmap(volatile void __iomem *addr);
116 * bt_ioremap() and bt_iounmap() are for temporary early boot-time
117 * mappings, before the real ioremap() is functional.
118 * A boot-time mapping is currently limited to at most 16 pages.
120 extern void *bt_ioremap(unsigned long offset, unsigned long size);
121 extern void bt_iounmap(void *addr, unsigned long size);
124 * ISA I/O bus memory addresses are 1:1 with the physical address.
126 #define isa_virt_to_bus virt_to_phys
127 #define isa_page_to_bus page_to_phys
128 #define isa_bus_to_virt phys_to_virt
131 * However PCI ones are not necessarily 1:1 and therefore these interfaces
132 * are forbidden in portable PCI drivers.
134 * Allow them on x86 for legacy drivers, though.
136 #define virt_to_bus virt_to_phys
137 #define bus_to_virt phys_to_virt
140 * readX/writeX() are used to access memory mapped devices. On some
141 * architectures the memory mapped IO stuff needs to be accessed
142 * differently. On the x86 architecture, we just read/write the
143 * memory location directly.
146 static inline unsigned char readb(const volatile void __iomem *addr)
148 return *(volatile unsigned char __force *) addr;
150 static inline unsigned short readw(const volatile void __iomem *addr)
152 return *(volatile unsigned short __force *) addr;
154 static inline unsigned int readl(const volatile void __iomem *addr)
156 return *(volatile unsigned int __force *) addr;
158 #define readb_relaxed(addr) readb(addr)
159 #define readw_relaxed(addr) readw(addr)
160 #define readl_relaxed(addr) readl(addr)
161 #define __raw_readb readb
162 #define __raw_readw readw
163 #define __raw_readl readl
165 static inline void writeb(unsigned char b, volatile void __iomem *addr)
167 *(volatile unsigned char __force *) addr = b;
169 static inline void writew(unsigned short b, volatile void __iomem *addr)
171 *(volatile unsigned short __force *) addr = b;
173 static inline void writel(unsigned int b, volatile void __iomem *addr)
175 *(volatile unsigned int __force *) addr = b;
177 #define __raw_writeb writeb
178 #define __raw_writew writew
179 #define __raw_writel writel
183 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
185 memset((void __force *) addr, val, count);
187 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
189 __memcpy(dst, (void __force *) src, count);
191 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
193 __memcpy((void __force *) dst, src, count);
197 * ISA space is 'always mapped' on a typical x86 system, no need to
198 * explicitly ioremap() it. The fact that the ISA IO space is mapped
199 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
200 * are physical addresses. The following constant pointer can be
201 * used as the IO-area pointer (it can be iounmapped as well, so the
202 * analogy with PCI is quite large):
204 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
206 #define isa_readb(a) readb(__ISA_IO_base + (a))
207 #define isa_readw(a) readw(__ISA_IO_base + (a))
208 #define isa_readl(a) readl(__ISA_IO_base + (a))
209 #define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a))
210 #define isa_writew(w,a) writew(w,__ISA_IO_base + (a))
211 #define isa_writel(l,a) writel(l,__ISA_IO_base + (a))
212 #define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c))
213 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
214 #define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c))
218 * Again, i386 does not require mem IO specific function.
221 #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void __force *)(b),(c),(d))
222 #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void __force *)(__ISA_IO_base + (b)),(c),(d))
225 * check_signature - find BIOS signatures
226 * @io_addr: mmio address to check
227 * @signature: signature block
228 * @length: length of signature
230 * Perform a signature comparison with the mmio address io_addr. This
231 * address should have been obtained by ioremap.
232 * Returns 1 on a match.
235 static inline int check_signature(volatile void __iomem * io_addr,
236 const unsigned char *signature, int length)
240 if (readb(io_addr) != *signature)
254 * This needed for two cases
255 * 1. Out of order aware processors
256 * 2. Accidentally out of order processors (PPro errata #51)
259 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
261 static inline void flush_write_buffers(void)
263 __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
266 #define dma_cache_inv(_start,_size) flush_write_buffers()
267 #define dma_cache_wback(_start,_size) flush_write_buffers()
268 #define dma_cache_wback_inv(_start,_size) flush_write_buffers()
274 #define dma_cache_inv(_start,_size) do { } while (0)
275 #define dma_cache_wback(_start,_size) do { } while (0)
276 #define dma_cache_wback_inv(_start,_size) do { } while (0)
277 #define flush_write_buffers()
281 #endif /* __KERNEL__ */
283 #ifdef SLOW_IO_BY_JUMPING
284 #define __SLOW_DOWN_IO "jmp 1f; 1: jmp 1f; 1:"
286 #define __SLOW_DOWN_IO "outb %%al,$0x80;"
289 static inline void slow_down_io(void) {
290 __asm__ __volatile__(
292 #ifdef REALLY_SLOW_IO
293 __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
298 #ifdef CONFIG_X86_NUMAQ
299 extern void *xquad_portio; /* Where the IO area was mapped */
300 #define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
301 #define __BUILDIO(bwl,bw,type) \
302 static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
304 write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
306 out##bwl##_local(value, port); \
308 static inline void out##bwl(unsigned type value, int port) { \
309 out##bwl##_quad(value, port, 0); \
311 static inline unsigned type in##bwl##_quad(int port, int quad) { \
313 return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
315 return in##bwl##_local(port); \
317 static inline unsigned type in##bwl(int port) { \
318 return in##bwl##_quad(port, 0); \
321 #define __BUILDIO(bwl,bw,type) \
322 static inline void out##bwl(unsigned type value, int port) { \
323 out##bwl##_local(value, port); \
325 static inline unsigned type in##bwl(int port) { \
326 return in##bwl##_local(port); \
331 #define BUILDIO(bwl,bw,type) \
332 static inline void out##bwl##_local(unsigned type value, int port) { \
333 __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
335 static inline unsigned type in##bwl##_local(int port) { \
336 unsigned type value; \
337 __asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \
340 static inline void out##bwl##_local_p(unsigned type value, int port) { \
341 out##bwl##_local(value, port); \
344 static inline unsigned type in##bwl##_local_p(int port) { \
345 unsigned type value = in##bwl##_local(port); \
349 __BUILDIO(bwl,bw,type) \
350 static inline void out##bwl##_p(unsigned type value, int port) { \
351 out##bwl(value, port); \
354 static inline unsigned type in##bwl##_p(int port) { \
355 unsigned type value = in##bwl(port); \
359 static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
360 __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
362 static inline void ins##bwl(int port, void *addr, unsigned long count) { \
363 __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \