1*7f11fd00SRichard Lowe #include <sys/ccompile.h>
2*7f11fd00SRichard Lowe
31b8adde7SWilliam Kucharski #ifndef IO_H
41b8adde7SWilliam Kucharski #define IO_H
51b8adde7SWilliam Kucharski
61b8adde7SWilliam Kucharski /* Amount of relocation etherboot is experiencing */
71b8adde7SWilliam Kucharski extern unsigned long virt_offset;
81b8adde7SWilliam Kucharski
91b8adde7SWilliam Kucharski /* Don't require identity mapped physical memory,
101b8adde7SWilliam Kucharski * osloader.c is the only valid user at the moment.
111b8adde7SWilliam Kucharski */
121b8adde7SWilliam Kucharski unsigned long virt_to_phys(volatile const void *virt_addr);
131b8adde7SWilliam Kucharski void *phys_to_virt(unsigned long phys_addr);
141b8adde7SWilliam Kucharski
151b8adde7SWilliam Kucharski /* virt_to_bus converts an addresss inside of etherboot [_start, _end]
161b8adde7SWilliam Kucharski * into a memory access cards can use.
171b8adde7SWilliam Kucharski */
181b8adde7SWilliam Kucharski #define virt_to_bus virt_to_phys
191b8adde7SWilliam Kucharski
201b8adde7SWilliam Kucharski
211b8adde7SWilliam Kucharski /* bus_to_virt reverses virt_to_bus, the address must be output
221b8adde7SWilliam Kucharski * from virt_to_bus to be valid. This function does not work on
231b8adde7SWilliam Kucharski * all bus addresses.
241b8adde7SWilliam Kucharski */
251b8adde7SWilliam Kucharski #define bus_to_virt phys_to_virt
261b8adde7SWilliam Kucharski
271b8adde7SWilliam Kucharski /* ioremap converts a random 32bit bus address into something
281b8adde7SWilliam Kucharski * etherboot can access.
291b8adde7SWilliam Kucharski */
ioremap(unsigned long bus_addr,unsigned long length __unused)301b8adde7SWilliam Kucharski static inline void *ioremap(unsigned long bus_addr, unsigned long length __unused)
311b8adde7SWilliam Kucharski {
321b8adde7SWilliam Kucharski return bus_to_virt(bus_addr);
331b8adde7SWilliam Kucharski }
341b8adde7SWilliam Kucharski
351b8adde7SWilliam Kucharski /* iounmap cleans up anything ioremap had to setup */
iounmap(void * virt_addr __unused)361b8adde7SWilliam Kucharski static inline void iounmap(void *virt_addr __unused)
371b8adde7SWilliam Kucharski {
381b8adde7SWilliam Kucharski return;
391b8adde7SWilliam Kucharski }
401b8adde7SWilliam Kucharski
411b8adde7SWilliam Kucharski /*
421b8adde7SWilliam Kucharski * This file contains the definitions for the x86 IO instructions
431b8adde7SWilliam Kucharski * inb/inw/inl/outb/outw/outl and the "string versions" of the same
441b8adde7SWilliam Kucharski * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
451b8adde7SWilliam Kucharski * versions of the single-IO instructions (inb_p/inw_p/..).
461b8adde7SWilliam Kucharski *
471b8adde7SWilliam Kucharski * This file is not meant to be obfuscating: it's just complicated
481b8adde7SWilliam Kucharski * to (a) handle it all in a way that makes gcc able to optimize it
491b8adde7SWilliam Kucharski * as well as possible and (b) trying to avoid writing the same thing
501b8adde7SWilliam Kucharski * over and over again with slight variations and possibly making a
511b8adde7SWilliam Kucharski * mistake somewhere.
521b8adde7SWilliam Kucharski */
531b8adde7SWilliam Kucharski
541b8adde7SWilliam Kucharski /*
551b8adde7SWilliam Kucharski * Thanks to James van Artsdalen for a better timing-fix than
561b8adde7SWilliam Kucharski * the two short jumps: using outb's to a nonexistent port seems
571b8adde7SWilliam Kucharski * to guarantee better timings even on fast machines.
581b8adde7SWilliam Kucharski *
591b8adde7SWilliam Kucharski * On the other hand, I'd like to be sure of a non-existent port:
601b8adde7SWilliam Kucharski * I feel a bit unsafe about using 0x80 (should be safe, though)
611b8adde7SWilliam Kucharski *
621b8adde7SWilliam Kucharski * Linus
631b8adde7SWilliam Kucharski */
641b8adde7SWilliam Kucharski
651b8adde7SWilliam Kucharski #ifdef SLOW_IO_BY_JUMPING
661b8adde7SWilliam Kucharski #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
671b8adde7SWilliam Kucharski #else
681b8adde7SWilliam Kucharski #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
691b8adde7SWilliam Kucharski #endif
701b8adde7SWilliam Kucharski
711b8adde7SWilliam Kucharski #ifdef REALLY_SLOW_IO
721b8adde7SWilliam Kucharski #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
731b8adde7SWilliam Kucharski #else
741b8adde7SWilliam Kucharski #define SLOW_DOWN_IO __SLOW_DOWN_IO
751b8adde7SWilliam Kucharski #endif
761b8adde7SWilliam Kucharski
771b8adde7SWilliam Kucharski /*
781b8adde7SWilliam Kucharski * readX/writeX() are used to access memory mapped devices. On some
791b8adde7SWilliam Kucharski * architectures the memory mapped IO stuff needs to be accessed
801b8adde7SWilliam Kucharski * differently. On the x86 architecture, we just read/write the
811b8adde7SWilliam Kucharski * memory location directly.
821b8adde7SWilliam Kucharski */
831b8adde7SWilliam Kucharski #define readb(addr) (*(volatile unsigned char *) (addr))
841b8adde7SWilliam Kucharski #define readw(addr) (*(volatile unsigned short *) (addr))
851b8adde7SWilliam Kucharski #define readl(addr) (*(volatile unsigned int *) (addr))
861b8adde7SWilliam Kucharski
871b8adde7SWilliam Kucharski #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
881b8adde7SWilliam Kucharski #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
891b8adde7SWilliam Kucharski #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
901b8adde7SWilliam Kucharski
911b8adde7SWilliam Kucharski #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
921b8adde7SWilliam Kucharski #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
931b8adde7SWilliam Kucharski
941b8adde7SWilliam Kucharski /*
951b8adde7SWilliam Kucharski * Force strict CPU ordering.
961b8adde7SWilliam Kucharski * And yes, this is required on UP too when we're talking
971b8adde7SWilliam Kucharski * to devices.
981b8adde7SWilliam Kucharski *
991b8adde7SWilliam Kucharski * For now, "wmb()" doesn't actually do anything, as all
1001b8adde7SWilliam Kucharski * Intel CPU's follow what Intel calls a *Processor Order*,
1011b8adde7SWilliam Kucharski * in which all writes are seen in the program order even
1021b8adde7SWilliam Kucharski * outside the CPU.
1031b8adde7SWilliam Kucharski *
1041b8adde7SWilliam Kucharski * I expect future Intel CPU's to have a weaker ordering,
1051b8adde7SWilliam Kucharski * but I'd also expect them to finally get their act together
1061b8adde7SWilliam Kucharski * and add some real memory barriers if so.
1071b8adde7SWilliam Kucharski *
1081b8adde7SWilliam Kucharski * Some non intel clones support out of order store. wmb() ceases to be a
1091b8adde7SWilliam Kucharski * nop for these.
1101b8adde7SWilliam Kucharski */
1111b8adde7SWilliam Kucharski
1121b8adde7SWilliam Kucharski #define mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
1131b8adde7SWilliam Kucharski #define rmb() mb()
1141b8adde7SWilliam Kucharski #define wmb() mb();
1151b8adde7SWilliam Kucharski
1161b8adde7SWilliam Kucharski
1171b8adde7SWilliam Kucharski /*
1181b8adde7SWilliam Kucharski * Talk about misusing macros..
1191b8adde7SWilliam Kucharski */
1201b8adde7SWilliam Kucharski
1211b8adde7SWilliam Kucharski #define __OUT1(s,x) \
1221b8adde7SWilliam Kucharski extern void __out##s(unsigned x value, unsigned short port); \
123*7f11fd00SRichard Lowe extern __GNU_INLINE \
124*7f11fd00SRichard Lowe void __out##s(unsigned x value, unsigned short port) {
1251b8adde7SWilliam Kucharski
1261b8adde7SWilliam Kucharski #define __OUT2(s,s1,s2) \
1271b8adde7SWilliam Kucharski __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
1281b8adde7SWilliam Kucharski
1291b8adde7SWilliam Kucharski #define __OUT(s,s1,x) \
1301b8adde7SWilliam Kucharski __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
1311b8adde7SWilliam Kucharski __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
1321b8adde7SWilliam Kucharski __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
1331b8adde7SWilliam Kucharski __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
1341b8adde7SWilliam Kucharski
1351b8adde7SWilliam Kucharski #define __IN1(s,x) \
1361b8adde7SWilliam Kucharski extern unsigned x __in##s(unsigned short port); \
137*7f11fd00SRichard Lowe extern __GNU_INLINE \
138*7f11fd00SRichard Lowe unsigned x __in##s(unsigned short port) { unsigned x _v;
1391b8adde7SWilliam Kucharski
1401b8adde7SWilliam Kucharski #define __IN2(s,s1,s2) \
1411b8adde7SWilliam Kucharski __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
1421b8adde7SWilliam Kucharski
1431b8adde7SWilliam Kucharski #define __IN(s,s1,x,i...) \
1441b8adde7SWilliam Kucharski __IN1(s,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
1451b8adde7SWilliam Kucharski __IN1(s##c,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
1461b8adde7SWilliam Kucharski __IN1(s##_p,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
1471b8adde7SWilliam Kucharski __IN1(s##c_p,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
1481b8adde7SWilliam Kucharski
1491b8adde7SWilliam Kucharski #define __INS(s) \
1501b8adde7SWilliam Kucharski extern void ins##s(unsigned short port, void * addr, unsigned long count); \
151*7f11fd00SRichard Lowe extern __GNU_INLINE \
152*7f11fd00SRichard Lowe void ins##s(unsigned short port, void * addr, unsigned long count) \
1531b8adde7SWilliam Kucharski { __asm__ __volatile__ ("cld ; rep ; ins" #s \
1541b8adde7SWilliam Kucharski : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
1551b8adde7SWilliam Kucharski
1561b8adde7SWilliam Kucharski #define __OUTS(s) \
1571b8adde7SWilliam Kucharski extern void outs##s(unsigned short port, const void * addr, unsigned long count); \
158*7f11fd00SRichard Lowe extern __GNU_INLINE \
159*7f11fd00SRichard Lowe void outs##s(unsigned short port, const void * addr, unsigned long count) \
1601b8adde7SWilliam Kucharski { __asm__ __volatile__ ("cld ; rep ; outs" #s \
1611b8adde7SWilliam Kucharski : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
1621b8adde7SWilliam Kucharski
1631b8adde7SWilliam Kucharski __IN(b,"", char)
1641b8adde7SWilliam Kucharski __IN(w,"",short)
1651b8adde7SWilliam Kucharski __IN(l,"", long)
1661b8adde7SWilliam Kucharski
1671b8adde7SWilliam Kucharski __OUT(b,"b",char)
1681b8adde7SWilliam Kucharski __OUT(w,"w",short)
1691b8adde7SWilliam Kucharski __OUT(l,,int)
1701b8adde7SWilliam Kucharski
1711b8adde7SWilliam Kucharski __INS(b)
1721b8adde7SWilliam Kucharski __INS(w)
1731b8adde7SWilliam Kucharski __INS(l)
1741b8adde7SWilliam Kucharski
1751b8adde7SWilliam Kucharski __OUTS(b)
1761b8adde7SWilliam Kucharski __OUTS(w)
1771b8adde7SWilliam Kucharski __OUTS(l)
1781b8adde7SWilliam Kucharski
1791b8adde7SWilliam Kucharski /*
1801b8adde7SWilliam Kucharski * Note that due to the way __builtin_constant_p() works, you
1811b8adde7SWilliam Kucharski * - can't use it inside a inline function (it will never be true)
1821b8adde7SWilliam Kucharski * - you don't have to worry about side effects within the __builtin..
1831b8adde7SWilliam Kucharski */
1841b8adde7SWilliam Kucharski #define outb(val,port) \
1851b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
1861b8adde7SWilliam Kucharski __outbc((val),(port)) : \
1871b8adde7SWilliam Kucharski __outb((val),(port)))
1881b8adde7SWilliam Kucharski
1891b8adde7SWilliam Kucharski #define inb(port) \
1901b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
1911b8adde7SWilliam Kucharski __inbc(port) : \
1921b8adde7SWilliam Kucharski __inb(port))
1931b8adde7SWilliam Kucharski
1941b8adde7SWilliam Kucharski #define outb_p(val,port) \
1951b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
1961b8adde7SWilliam Kucharski __outbc_p((val),(port)) : \
1971b8adde7SWilliam Kucharski __outb_p((val),(port)))
1981b8adde7SWilliam Kucharski
1991b8adde7SWilliam Kucharski #define inb_p(port) \
2001b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2011b8adde7SWilliam Kucharski __inbc_p(port) : \
2021b8adde7SWilliam Kucharski __inb_p(port))
2031b8adde7SWilliam Kucharski
2041b8adde7SWilliam Kucharski #define outw(val,port) \
2051b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2061b8adde7SWilliam Kucharski __outwc((val),(port)) : \
2071b8adde7SWilliam Kucharski __outw((val),(port)))
2081b8adde7SWilliam Kucharski
2091b8adde7SWilliam Kucharski #define inw(port) \
2101b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2111b8adde7SWilliam Kucharski __inwc(port) : \
2121b8adde7SWilliam Kucharski __inw(port))
2131b8adde7SWilliam Kucharski
2141b8adde7SWilliam Kucharski #define outw_p(val,port) \
2151b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2161b8adde7SWilliam Kucharski __outwc_p((val),(port)) : \
2171b8adde7SWilliam Kucharski __outw_p((val),(port)))
2181b8adde7SWilliam Kucharski
2191b8adde7SWilliam Kucharski #define inw_p(port) \
2201b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2211b8adde7SWilliam Kucharski __inwc_p(port) : \
2221b8adde7SWilliam Kucharski __inw_p(port))
2231b8adde7SWilliam Kucharski
2241b8adde7SWilliam Kucharski #define outl(val,port) \
2251b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2261b8adde7SWilliam Kucharski __outlc((val),(port)) : \
2271b8adde7SWilliam Kucharski __outl((val),(port)))
2281b8adde7SWilliam Kucharski
2291b8adde7SWilliam Kucharski #define inl(port) \
2301b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2311b8adde7SWilliam Kucharski __inlc(port) : \
2321b8adde7SWilliam Kucharski __inl(port))
2331b8adde7SWilliam Kucharski
2341b8adde7SWilliam Kucharski #define outl_p(val,port) \
2351b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2361b8adde7SWilliam Kucharski __outlc_p((val),(port)) : \
2371b8adde7SWilliam Kucharski __outl_p((val),(port)))
2381b8adde7SWilliam Kucharski
2391b8adde7SWilliam Kucharski #define inl_p(port) \
2401b8adde7SWilliam Kucharski ((__builtin_constant_p((port)) && (port) < 256) ? \
2411b8adde7SWilliam Kucharski __inlc_p(port) : \
2421b8adde7SWilliam Kucharski __inl_p(port))
2431b8adde7SWilliam Kucharski
2441b8adde7SWilliam Kucharski #endif /* ETHERBOOT_IO_H */
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