4 #include <linux/config.h>
7 * This file contains the definitions for the x86 IO instructions
8 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
9 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
10 * versions of the single-IO instructions (inb_p/inw_p/..).
12 * This file is not meant to be obfuscating: it's just complicated
13 * to (a) handle it all in a way that makes gcc able to optimize it
14 * as well as possible and (b) trying to avoid writing the same thing
15 * over and over again with slight variations and possibly making a
20 * Thanks to James van Artsdalen for a better timing-fix than
21 * the two short jumps: using outb's to a nonexistent port seems
22 * to guarantee better timings even on fast machines.
24 * On the other hand, I'd like to be sure of a non-existent port:
25 * I feel a bit unsafe about using 0x80 (should be safe, though)
31 * Bit simplified and optimized by Jan Hubicka
32 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
34 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
35 * isa_read[wl] and isa_write[wl] fixed
36 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
39 #ifdef SLOW_IO_BY_JUMPING
40 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
42 #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
46 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
48 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
52 * Talk about misusing macros..
55 extern inline void out##s(unsigned x value, unsigned short port) {
57 #define __OUT2(s,s1,s2) \
58 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
60 #define __OUT(s,s1,x) \
61 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
62 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
65 extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
67 #define __IN2(s,s1,s2) \
68 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
70 #define __IN(s,s1,i...) \
71 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
72 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
75 extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
76 { __asm__ __volatile__ ("rep ; ins" #s \
77 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
80 extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
81 { __asm__ __volatile__ ("rep ; outs" #s \
82 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
84 #define RETURN_TYPE unsigned char
87 #define RETURN_TYPE unsigned short
90 #define RETURN_TYPE unsigned int
106 #define IO_SPACE_LIMIT 0xffff
108 #if defined(__KERNEL__) && __x86_64__
110 #include <linux/vmalloc.h>
114 * Change virtual addresses to physical addresses and vv.
115 * These are pretty trivial
117 extern inline unsigned long virt_to_phys(volatile void * address)
119 return __pa(address);
122 extern inline void * phys_to_virt(unsigned long address)
124 return __va(address);
129 * Change "struct page" to physical address.
131 #ifdef CONFIG_DISCONTIGMEM
132 #include <asm/mmzone.h>
133 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
135 #define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
138 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
140 extern inline void * ioremap (unsigned long offset, unsigned long size)
142 return __ioremap(offset, size, 0);
146 * This one maps high address device memory and turns off caching for that area.
147 * it's useful if some control registers are in such an area and write combining
148 * or read caching is not desirable:
150 extern void * ioremap_nocache (unsigned long offset, unsigned long size);
151 extern void iounmap(void *addr);
154 * ISA I/O bus memory addresses are 1:1 with the physical address.
156 #define isa_virt_to_bus virt_to_phys
157 #define isa_page_to_bus page_to_phys
158 #define isa_bus_to_virt phys_to_virt
161 * However PCI ones are not necessarily 1:1 and therefore these interfaces
162 * are forbidden in portable PCI drivers.
164 * Allow them on x86 for legacy drivers, though.
166 #define virt_to_bus virt_to_phys
167 #define bus_to_virt phys_to_virt
170 * readX/writeX() are used to access memory mapped devices. On some
171 * architectures the memory mapped IO stuff needs to be accessed
172 * differently. On the x86 architecture, we just read/write the
173 * memory location directly.
176 #define readb(addr) (*(volatile unsigned char *) (addr))
177 #define readw(addr) (*(volatile unsigned short *) (addr))
178 #define readl(addr) (*(volatile unsigned int *) (addr))
179 #define readq(addr) (*(volatile unsigned long *) (addr))
180 #define readb_relaxed(a) readb(a)
181 #define readw_relaxed(a) readw(a)
182 #define readl_relaxed(a) readl(a)
183 #define readq_relaxed(a) readq(a)
184 #define __raw_readb readb
185 #define __raw_readw readw
186 #define __raw_readl readl
187 #define __raw_readq readq
189 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
190 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
191 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
192 #define writeq(b,addr) (*(volatile unsigned long *) (addr) = (b))
193 #define __raw_writeb writeb
194 #define __raw_writew writew
195 #define __raw_writel writel
196 #define __raw_writeq writeq
198 void *__memcpy_fromio(void*,unsigned long,unsigned);
199 void *__memcpy_toio(unsigned long,const void*,unsigned);
201 #define memcpy_fromio(to,from,len) \
202 __memcpy_fromio((to),(unsigned long)(from),(len))
203 #define memcpy_toio(to,from,len) \
204 __memcpy_toio((unsigned long)(to),(from),(len))
205 #define memset_io(a,b,c) memset((void *)(a),(b),(c))
208 * ISA space is 'always mapped' on a typical x86 system, no need to
209 * explicitly ioremap() it. The fact that the ISA IO space is mapped
210 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
211 * are physical addresses. The following constant pointer can be
212 * used as the IO-area pointer (it can be iounmapped as well, so the
213 * analogy with PCI is quite large):
215 #define __ISA_IO_base ((char *)(PAGE_OFFSET))
217 #define isa_readb(a) readb(__ISA_IO_base + (a))
218 #define isa_readw(a) readw(__ISA_IO_base + (a))
219 #define isa_readl(a) readl(__ISA_IO_base + (a))
220 #define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a))
221 #define isa_writew(w,a) writew(w,__ISA_IO_base + (a))
222 #define isa_writel(l,a) writel(l,__ISA_IO_base + (a))
223 #define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c))
224 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
225 #define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c))
229 * Again, x86-64 does not require mem IO specific function.
232 #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
233 #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(__ISA_IO_base + (b)),(c),(d))
236 * check_signature - find BIOS signatures
237 * @io_addr: mmio address to check
238 * @signature: signature block
239 * @length: length of signature
241 * Perform a signature comparison with the mmio address io_addr. This
242 * address should have been obtained by ioremap.
243 * Returns 1 on a match.
246 static inline int check_signature(unsigned long io_addr,
247 const unsigned char *signature, int length)
251 if (readb(io_addr) != *signature)
264 * isa_check_signature - find BIOS signatures
265 * @io_addr: mmio address to check
266 * @signature: signature block
267 * @length: length of signature
269 * Perform a signature comparison with the ISA mmio address io_addr.
270 * Returns 1 on a match.
272 * This function is deprecated. New drivers should use ioremap and
277 static inline int isa_check_signature(unsigned long io_addr,
278 const unsigned char *signature, int length)
282 if (isa_readb(io_addr) != *signature)
296 #define dma_cache_inv(_start,_size) do { } while (0)
297 #define dma_cache_wback(_start,_size) do { } while (0)
298 #define dma_cache_wback_inv(_start,_size) do { } while (0)
300 #define flush_write_buffers()
302 /* Disable vmerge for now. Need to fix the block layer code
303 to check for non iommu addresses first.
304 When the IOMMU is force it is safe to enable. */
305 extern int iommu_merge;
306 #define BIO_VMERGE_BOUNDARY (iommu_merge ? 4096 : 0)
308 #endif /* __KERNEL__ */