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- #ifndef _ASM_IO_H
- #define _ASM_IO_H
-
- /*
- * This file contains the definitions for the x86 IO instructions
- * inb/inw/inl/outb/outw/outl and the "string versions" of the same
- * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
- * versions of the single-IO instructions (inb_p/inw_p/..).
- *
- * This file is not meant to be obfuscating: it's just complicated
- * to (a) handle it all in a way that makes gcc able to optimize it
- * as well as possible and (b) trying to avoid writing the same thing
- * over and over again with slight variations and possibly making a
- * mistake somewhere.
- */
-
- /*
- * Thanks to James van Artsdalen for a better timing-fix than
- * the two short jumps: using outb's to a nonexistent port seems
- * to guarantee better timings even on fast machines.
- *
- * On the other hand, I'd like to be sure of a non-existent port:
- * I feel a bit unsafe about using 0x80 (should be safe, though)
- *
- * Linus
- */
-
- /*
- * Bit simplified and optimized by Jan Hubicka
- */
-
- #ifdef SLOW_IO_BY_JUMPING
- #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
- #else
- #define __SLOW_DOWN_IO "\noutb %%al,$0x80"
- #endif
-
- #ifdef REALLY_SLOW_IO
- #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
- #else
- #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
- #endif
-
- /*
- * Talk about misusing macros..
- */
- #define __OUT1(s,x) \
- extern inline void out##s(unsigned x value, unsigned short port) {
-
- #define __OUT2(s,s1,s2) \
- __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
-
- #define __OUT(s,s1,x) \
- __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
- __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \
-
- #define __IN1(s) \
- extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
-
- #define __IN2(s,s1,s2) \
- __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
-
- #define __IN(s,s1,i...) \
- __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
- __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
-
- #define __INS(s) \
- extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
- { __asm__ __volatile__ ("cld ; rep ; ins" #s \
- : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
-
- #define __OUTS(s) \
- extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
- { __asm__ __volatile__ ("cld ; rep ; outs" #s \
- : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
-
- #define RETURN_TYPE unsigned char
- __IN(b,"")
- #undef RETURN_TYPE
- #define RETURN_TYPE unsigned short
- __IN(w,"")
- #undef RETURN_TYPE
- #define RETURN_TYPE unsigned int
- __IN(l,"")
- #undef RETURN_TYPE
-
- __OUT(b,"b",char)
- __OUT(w,"w",short)
- __OUT(l,,int)
-
- __INS(b)
- __INS(w)
- __INS(l)
-
- __OUTS(b)
- __OUTS(w)
- __OUTS(l)
-
- #ifdef __KERNEL__
-
- #include <linux/vmalloc.h>
- #include <asm/page.h>
-
- #define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x)))
- #define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET)
- /*
- * Change virtual addresses to physical addresses and vv.
- * These are pretty trivial
- */
- extern inline unsigned long virt_to_phys(volatile void * address)
- {
- return __io_phys(address);
- }
-
- extern inline void * phys_to_virt(unsigned long address)
- {
- return __io_virt(address);
- }
-
- extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
-
- extern inline void * ioremap (unsigned long offset, unsigned long size)
- {
- return __ioremap(offset, size, 0);
- }
-
- /*
- * This one maps high address device memory and turns off caching for that area.
- * it's useful if some control registers are in such an area and write combining
- * or read caching is not desirable:
- */
- extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
- {
- return __ioremap(offset, size, _PAGE_PCD);
- }
-
- extern void iounmap(void *addr);
-
- /*
- * IO bus memory addresses are also 1:1 with the physical address
- */
- #define virt_to_bus virt_to_phys
- #define bus_to_virt phys_to_virt
-
- /*
- * readX/writeX() are used to access memory mapped devices. On some
- * architectures the memory mapped IO stuff needs to be accessed
- * differently. On the x86 architecture, we just read/write the
- * memory location directly.
- */
-
- #define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
- #define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
- #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
-
- #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
- #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
- #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
-
- #define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
- #define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
- #define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
-
- /*
- * Again, i386 does not require mem IO specific function.
- */
-
- #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),__io_virt(b),(c),(d))
-
- static inline int check_signature(unsigned long io_addr,
- const unsigned char *signature, int length)
- {
- int retval = 0;
- do {
- if (readb(io_addr) != *signature)
- goto out;
- io_addr++;
- signature++;
- length--;
- } while (length);
- retval = 1;
- out:
- return retval;
- }
-
- #endif /* __KERNEL__ */
-
- #endif
-