#ifndef _ASM_IO_H
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#ifndef _ASM_IO_H
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#define _ASM_IO_H
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#define _ASM_IO_H
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/*
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/*
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* This file contains the definitions for the x86 IO instructions
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* This file contains the definitions for the x86 IO instructions
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* inb/inw/inl/outb/outw/outl and the "string versions" of the same
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* inb/inw/inl/outb/outw/outl and the "string versions" of the same
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* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
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* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
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* versions of the single-IO instructions (inb_p/inw_p/..).
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* versions of the single-IO instructions (inb_p/inw_p/..).
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*
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*
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* This file is not meant to be obfuscating: it's just complicated
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* This file is not meant to be obfuscating: it's just complicated
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* to (a) handle it all in a way that makes gcc able to optimize it
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* to (a) handle it all in a way that makes gcc able to optimize it
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* as well as possible and (b) trying to avoid writing the same thing
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* as well as possible and (b) trying to avoid writing the same thing
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* over and over again with slight variations and possibly making a
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* over and over again with slight variations and possibly making a
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* mistake somewhere.
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* mistake somewhere.
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*/
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*/
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/*
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/*
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* Thanks to James van Artsdalen for a better timing-fix than
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* Thanks to James van Artsdalen for a better timing-fix than
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* the two short jumps: using outb's to a nonexistent port seems
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* the two short jumps: using outb's to a nonexistent port seems
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* to guarantee better timings even on fast machines.
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* to guarantee better timings even on fast machines.
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*
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*
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* On the other hand, I'd like to be sure of a non-existent port:
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* On the other hand, I'd like to be sure of a non-existent port:
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* I feel a bit unsafe about using 0x80 (should be safe, though)
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* I feel a bit unsafe about using 0x80 (should be safe, though)
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*
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*
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* Linus
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* Linus
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*/
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*/
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#ifdef SLOW_IO_BY_JUMPING
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#ifdef SLOW_IO_BY_JUMPING
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#define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
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#define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
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#else
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#else
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#define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
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#define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
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#endif
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#endif
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#ifdef REALLY_SLOW_IO
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#ifdef REALLY_SLOW_IO
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#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
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#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
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#else
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#else
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#define SLOW_DOWN_IO __SLOW_DOWN_IO
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#define SLOW_DOWN_IO __SLOW_DOWN_IO
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#endif
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#endif
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/*
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/*
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* Change virtual addresses to physical addresses and vv.
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* Change virtual addresses to physical addresses and vv.
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* These are trivial on the 1:1 Linux/i386 mapping (but if we ever
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* These are trivial on the 1:1 Linux/i386 mapping (but if we ever
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* make the kernel segment mapped at 0, we need to do translation
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* make the kernel segment mapped at 0, we need to do translation
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* on the i386 as well)
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* on the i386 as well)
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*/
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*/
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extern inline unsigned long virt_to_phys(volatile void * address)
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extern inline unsigned long virt_to_phys(volatile void * address)
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{
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{
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return (unsigned long) address;
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return (unsigned long) address;
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}
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}
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extern inline void * phys_to_virt(unsigned long address)
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extern inline void * phys_to_virt(unsigned long address)
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{
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{
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return (void *) address;
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return (void *) address;
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}
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}
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/*
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/*
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* IO bus memory addresses are also 1:1 with the physical address
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* IO bus memory addresses are also 1:1 with the physical address
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*/
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*/
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#define virt_to_bus virt_to_phys
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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#define bus_to_virt phys_to_virt
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/*
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/*
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* readX/writeX() are used to access memory mapped devices. On some
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* readX/writeX() are used to access memory mapped devices. On some
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* architectures the memory mapped IO stuff needs to be accessed
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* architectures the memory mapped IO stuff needs to be accessed
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* differently. On the x86 architecture, we just read/write the
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* differently. On the x86 architecture, we just read/write the
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* memory location directly.
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* memory location directly.
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*/
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*/
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#define readb(addr) (*(volatile unsigned char *) (addr))
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#define readb(addr) (*(volatile unsigned char *) (addr))
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#define readw(addr) (*(volatile unsigned short *) (addr))
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#define readw(addr) (*(volatile unsigned short *) (addr))
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#define readl(addr) (*(volatile unsigned int *) (addr))
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#define readl(addr) (*(volatile unsigned int *) (addr))
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#define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
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#define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
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#define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
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#define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
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#define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
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#define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
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#define memset_io(a,b,c) memset((void *)(a),(b),(c))
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#define memset_io(a,b,c) memset((void *)(a),(b),(c))
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#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
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#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
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#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
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#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
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/*
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/*
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* Again, i386 does not require mem IO specific function.
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* Again, i386 does not require mem IO specific function.
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*/
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*/
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#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
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#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void *)(b),(c),(d))
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/*
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/*
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* Talk about misusing macros..
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* Talk about misusing macros..
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*/
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*/
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#define __OUT1(s,x) \
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#define __OUT1(s,x) \
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extern inline void __out##s(unsigned x value, unsigned short port) {
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extern inline void __out##s(unsigned x value, unsigned short port) {
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#define __OUT2(s,s1,s2) \
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#define __OUT2(s,s1,s2) \
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__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
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__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
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#define __OUT(s,s1,x) \
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#define __OUT(s,s1,x) \
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__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
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__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
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__OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
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__OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
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__OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
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__OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
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__OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
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__OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
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#define __IN1(s) \
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#define __IN1(s) \
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extern inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
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extern inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
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#define __IN2(s,s1,s2) \
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#define __IN2(s,s1,s2) \
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__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
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__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
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#define __IN(s,s1,i...) \
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#define __IN(s,s1,i...) \
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__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
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__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
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__IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
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__IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
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__IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
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__IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
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__IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
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__IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
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#define __INS(s) \
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#define __INS(s) \
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extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
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extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
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{ __asm__ __volatile__ ("cld ; rep ; ins" #s \
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{ __asm__ __volatile__ ("cld ; rep ; ins" #s \
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: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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#define __OUTS(s) \
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#define __OUTS(s) \
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extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
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extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
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{ __asm__ __volatile__ ("cld ; rep ; outs" #s \
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{ __asm__ __volatile__ ("cld ; rep ; outs" #s \
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: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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#define RETURN_TYPE unsigned char
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#define RETURN_TYPE unsigned char
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/* __IN(b,"b","0" (0)) */
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/* __IN(b,"b","0" (0)) */
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__IN(b,"")
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__IN(b,"")
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#undef RETURN_TYPE
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned short
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#define RETURN_TYPE unsigned short
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/* __IN(w,"w","0" (0)) */
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/* __IN(w,"w","0" (0)) */
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__IN(w,"")
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__IN(w,"")
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#undef RETURN_TYPE
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned int
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#define RETURN_TYPE unsigned int
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__IN(l,"")
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__IN(l,"")
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#undef RETURN_TYPE
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#undef RETURN_TYPE
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__OUT(b,"b",char)
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__OUT(b,"b",char)
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__OUT(w,"w",short)
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__OUT(w,"w",short)
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__OUT(l,,int)
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__OUT(l,,int)
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__INS(b)
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__INS(b)
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__INS(w)
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__INS(w)
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__INS(l)
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__INS(l)
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__OUTS(b)
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__OUTS(b)
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__OUTS(w)
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__OUTS(w)
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__OUTS(l)
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__OUTS(l)
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/*
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/*
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* Note that due to the way __builtin_constant_p() works, you
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* Note that due to the way __builtin_constant_p() works, you
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* - can't use it inside a inline function (it will never be true)
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* - can't use it inside a inline function (it will never be true)
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* - you don't have to worry about side effects within the __builtin..
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* - you don't have to worry about side effects within the __builtin..
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*/
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*/
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#define outb(val,port) \
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#define outb(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outbc((val),(port)) : \
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__outbc((val),(port)) : \
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__outb((val),(port)))
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__outb((val),(port)))
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#define inb(port) \
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#define inb(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inbc(port) : \
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__inbc(port) : \
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__inb(port))
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__inb(port))
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#define outb_p(val,port) \
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#define outb_p(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outbc_p((val),(port)) : \
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__outbc_p((val),(port)) : \
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__outb_p((val),(port)))
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__outb_p((val),(port)))
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#define inb_p(port) \
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#define inb_p(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inbc_p(port) : \
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__inbc_p(port) : \
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__inb_p(port))
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__inb_p(port))
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#define outw(val,port) \
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#define outw(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outwc((val),(port)) : \
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__outwc((val),(port)) : \
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__outw((val),(port)))
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__outw((val),(port)))
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#define inw(port) \
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#define inw(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inwc(port) : \
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__inwc(port) : \
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__inw(port))
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__inw(port))
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#define outw_p(val,port) \
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#define outw_p(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outwc_p((val),(port)) : \
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__outwc_p((val),(port)) : \
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__outw_p((val),(port)))
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__outw_p((val),(port)))
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#define inw_p(port) \
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#define inw_p(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inwc_p(port) : \
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__inwc_p(port) : \
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__inw_p(port))
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__inw_p(port))
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#define outl(val,port) \
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#define outl(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outlc((val),(port)) : \
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__outlc((val),(port)) : \
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__outl((val),(port)))
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__outl((val),(port)))
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#define inl(port) \
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#define inl(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inlc(port) : \
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__inlc(port) : \
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__inl(port))
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__inl(port))
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#define outl_p(val,port) \
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#define outl_p(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outlc_p((val),(port)) : \
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__outlc_p((val),(port)) : \
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__outl_p((val),(port)))
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__outl_p((val),(port)))
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#define inl_p(port) \
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#define inl_p(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inlc_p(port) : \
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__inlc_p(port) : \
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__inl_p(port))
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__inl_p(port))
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#endif
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#endif
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