mirror of
https://github.com/memtest86plus/memtest86plus.git
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146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef IO_H
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#define IO_H
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/*
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* Provides macro 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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* (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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*
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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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* 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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* mistake somewhere.
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*
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* Derived from memtest86+ io.h.
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* (original contained no copyright statement)
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*/
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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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#else
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#define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
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#endif
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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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#else
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#define SLOW_DOWN_IO __SLOW_DOWN_IO
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#endif
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#define __OUT1(s,x) \
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static inline void __out##s(unsigned x value, unsigned short port) {
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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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#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##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##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
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#define __IN1(s) \
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static inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
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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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#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##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##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
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#define __OUTS(s) \
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static 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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: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
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#define RETURN_TYPE unsigned char
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/* __IN(b,"b","0" (0)) */
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__IN(b,"")
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned short
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/* __IN(w,"w","0" (0)) */
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__IN(w,"")
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned int
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__IN(l,"")
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#undef RETURN_TYPE
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__OUT(b,"b",char)
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__OUT(w,"w",short)
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__OUT(l,,int)
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__OUTS(b)
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__OUTS(w)
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__OUTS(l)
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/*
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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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* - you don't have to worry about side effects within the __builtin..
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*/
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#define outb(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outbc((val),(port)) : \
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__outb((val),(port)))
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#define inb(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inbc(port) : \
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__inb(port))
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#define outw(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outwc((val),(port)) : \
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__outw((val),(port)))
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#define inw(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inwc(port) : \
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__inw(port))
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#define outl(val,port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__outlc((val),(port)) : \
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__outl((val),(port)))
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#define inl(port) \
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((__builtin_constant_p((port)) && (port) < 256) ? \
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__inlc(port) : \
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__inl(port))
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static __inline unsigned char
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inb_p (unsigned short int __port)
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{
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unsigned char _v;
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__asm__ __volatile__ ("\t"
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"inb %w1,%0 \n\t"
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"outb %%al,$0x80 \n"
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: "=a" (_v)
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: "Nd" (__port)
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);
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return _v;
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}
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static __inline void
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outb_p (unsigned char __value, unsigned short int __port)
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{
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__asm__ __volatile__ ("\t"
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"outb %b0,%w1 \n\t"
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"outb %%al,$0x80 \n"
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: /* no outputs */
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: "a" (__value),
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"Nd" (__port)
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);
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}
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#endif // IO_H
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