238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
#ifndef _ASM_IO_H
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#define _ASM_IO_H
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/*
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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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* (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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/*
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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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* to guarantee better timings even on fast machines.
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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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* I feel a bit unsafe about using 0x80 (should be safe, though)
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*
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* Linus
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*/
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/*
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* Bit simplified and optimized by Jan Hubicka
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
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*
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* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
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* isa_read[wl] and isa_write[wl] fixed
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* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*/
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#define IO_SPACE_LIMIT 0xffff
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#ifdef __KERNEL__
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/*
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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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* differently. On the x86 architecture, we just read/write the
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* memory location directly.
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*/
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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 readl(addr) (*(volatile unsigned int *) (addr))
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#define __raw_readb readb
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#define __raw_readw readw
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#define __raw_readl readl
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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 writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
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#define __raw_writeb writeb
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#define __raw_writew writew
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#define __raw_writel writel
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#define memset_io(a,b,c) memset((a),(b),(c))
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#define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
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#define memcpy_toio(a,b,c) memcpy((a),(b),(c))
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/*
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* ISA space is 'always mapped' on a typical x86 system, no need to
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* explicitly ioremap() it. The fact that the ISA IO space is mapped
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* to PAGE_OFFSET is pure coincidence - it does not mean ISA values
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* are physical addresses. The following constant pointer can be
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* used as the IO-area pointer (it can be iounmapped as well, so the
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* analogy with PCI is quite large):
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*/
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#define isa_readb(a) readb((a))
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#define isa_readw(a) readw((a))
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#define isa_readl(a) readl((a))
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#define isa_writeb(b,a) writeb(b,(a))
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#define isa_writew(w,a) writew(w,(a))
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#define isa_writel(l,a) writel(l,(a))
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#define isa_memset_io(a,b,c) memset_io((a),(b),(c))
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#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
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#define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
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static inline int check_signature(unsigned long io_addr,
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const unsigned char *signature, int length)
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{
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int retval = 0;
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do {
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if (readb(io_addr) != *signature)
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goto out;
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io_addr++;
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signature++;
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length--;
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} while (length);
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retval = 1;
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out:
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return retval;
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}
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/**
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* isa_check_signature - find BIOS signatures
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* @io_addr: mmio address to check
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* @signature: signature block
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* @length: length of signature
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*
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* Perform a signature comparison with the ISA mmio address io_addr.
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* Returns 1 on a match.
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*
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* This function is deprecated. New drivers should use ioremap and
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* check_signature.
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*/
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static inline int isa_check_signature(unsigned long io_addr,
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const unsigned char *signature, int length)
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{
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int retval = 0;
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do {
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if (isa_readb(io_addr) != *signature)
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goto out;
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io_addr++;
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signature++;
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length--;
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} while (length);
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retval = 1;
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out:
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return retval;
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}
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#endif /* __KERNEL__ */
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#ifdef SLOW_IO_BY_JUMPING
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#define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
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#else
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#define __SLOW_DOWN_IO "\noutb %%al,$0x80"
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#endif
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#ifdef REALLY_SLOW_IO
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#define __FULL_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 __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
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#endif
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/*
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* Talk about misusing macros..
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*/
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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), "Nd" (port)); } \
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__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
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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) : "Nd" (port) ,##i ); return _v; } \
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__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
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#define __INS(s) \
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static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
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{ __asm__ __volatile__ ("rep ; ins" #s \
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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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static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
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{ __asm__ __volatile__ ("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,"")
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#undef RETURN_TYPE
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#define RETURN_TYPE unsigned short
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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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__INS(b)
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__INS(w)
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__INS(l)
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__OUTS(b)
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__OUTS(w)
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__OUTS(l)
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static inline void sync(void)
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{
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}
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/*
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* Given a physical address and a length, return a virtual address
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* that can be used to access the memory range with the caching
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* properties specified by "flags".
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*/
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#define MAP_NOCACHE (0)
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#define MAP_WRCOMBINE (0)
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#define MAP_WRBACK (0)
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#define MAP_WRTHROUGH (0)
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static inline void *
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map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
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{
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return (void *)paddr;
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}
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/*
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* Take down a mapping set up by map_physmem().
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*/
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static inline void unmap_physmem(void *vaddr, unsigned long flags)
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{
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}
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static inline phys_addr_t virt_to_phys(void * vaddr)
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{
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return (phys_addr_t)(vaddr);
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}
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#endif
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