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 #define IO_SPACE_LIMIT 0xffff
46 * readX/writeX() are used to access memory mapped devices. On some
47 * architectures the memory mapped IO stuff needs to be accessed
48 * differently. On the x86 architecture, we just read/write the
49 * memory location directly.
52 #define readb(addr) (*(volatile unsigned char *) (addr))
53 #define readw(addr) (*(volatile unsigned short *) (addr))
54 #define readl(addr) (*(volatile unsigned int *) (addr))
55 #define __raw_readb readb
56 #define __raw_readw readw
57 #define __raw_readl readl
59 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
60 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
61 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
62 #define __raw_writeb writeb
63 #define __raw_writew writew
64 #define __raw_writel writel
66 #define memset_io(a,b,c) memset((a),(b),(c))
67 #define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
68 #define memcpy_toio(a,b,c) memcpy((a),(b),(c))
71 * ISA space is 'always mapped' on a typical x86 system, no need to
72 * explicitly ioremap() it. The fact that the ISA IO space is mapped
73 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
74 * are physical addresses. The following constant pointer can be
75 * used as the IO-area pointer (it can be iounmapped as well, so the
76 * analogy with PCI is quite large):
78 #define isa_readb(a) readb((a))
79 #define isa_readw(a) readw((a))
80 #define isa_readl(a) readl((a))
81 #define isa_writeb(b,a) writeb(b,(a))
82 #define isa_writew(w,a) writew(w,(a))
83 #define isa_writel(l,a) writel(l,(a))
84 #define isa_memset_io(a,b,c) memset_io((a),(b),(c))
85 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
86 #define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
90 static inline int check_signature(unsigned long io_addr,
91 const unsigned char *signature, int length)
95 if (readb(io_addr) != *signature)
107 * isa_check_signature - find BIOS signatures
108 * @io_addr: mmio address to check
109 * @signature: signature block
110 * @length: length of signature
112 * Perform a signature comparison with the ISA mmio address io_addr.
113 * Returns 1 on a match.
115 * This function is deprecated. New drivers should use ioremap and
120 static inline int isa_check_signature(unsigned long io_addr,
121 const unsigned char *signature, int length)
125 if (isa_readb(io_addr) != *signature)
136 #endif /* __KERNEL__ */
138 #ifdef SLOW_IO_BY_JUMPING
139 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
141 #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
144 #ifdef REALLY_SLOW_IO
145 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
147 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
152 * Talk about misusing macros..
154 #define __OUT1(s,x) \
155 static inline void out##s(unsigned x value, unsigned short port) {
157 #define __OUT2(s,s1,s2) \
158 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
161 #define __OUT(s,s1,x) \
162 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
163 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
166 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
168 #define __IN2(s,s1,s2) \
169 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
171 #define __IN(s,s1,i...) \
172 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
173 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
176 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
177 { __asm__ __volatile__ ("rep ; ins" #s \
178 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
181 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
182 { __asm__ __volatile__ ("rep ; outs" #s \
183 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
185 #define RETURN_TYPE unsigned char
188 #define RETURN_TYPE unsigned short
191 #define RETURN_TYPE unsigned int