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8089a0432e
didn't work are somewhat bogusly optimized away before the constraint is checked. We still expect constants passed to inline functions to remain constant, but if the compiler ever decides that they aren't constant then it will just generate slightly slower code instead of an error.
452 lines
12 KiB
C
452 lines
12 KiB
C
/*-
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* Copyright (c) 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: cpufunc.h,v 1.37 1995/05/30 08:00:30 rgrimes Exp $
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*/
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/*
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* Functions to provide access to special i386 instructions.
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*/
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#ifndef _MACHINE_CPUFUNC_H_
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#define _MACHINE_CPUFUNC_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <machine/spl.h> /* XXX belongs elsewhere */
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#ifdef __GNUC__
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#ifdef BDE_DEBUGGER
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extern int bdb_exists;
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static __inline int
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bdb(void)
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{
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if (!bdb_exists)
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return (0);
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__asm __volatile("int $3");
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return (1);
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}
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#endif /* BDE_DEBUGGER */
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static __inline void
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disable_intr(void)
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{
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__asm __volatile("cli");
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}
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static __inline void
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enable_intr(void)
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{
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__asm __volatile("sti");
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}
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#define HAVE_INLINE_FFS
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static __inline int
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ffs(int mask)
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{
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int result;
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/*
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* bsfl turns out to be not all that slow on 486's. It can beaten
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* using a binary search to reduce to 4 bits and then a table lookup,
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* but only if the code is inlined and in the cache, and the code
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* is quite large so inlining it probably busts the cache.
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*
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* Note that gcc-2's builtin ffs would be used if we didn't declare
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* this inline or turn off the builtin. The builtin is faster but
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* broken in gcc-2.4.5 and slower but working in gcc-2.5 and 2.6.
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*/
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__asm __volatile("testl %0,%0; je 1f; bsfl %0,%0; incl %0; 1:"
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: "=r" (result) : "0" (mask));
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return (result);
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}
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#if __GNUC__ < 2
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#define inb(port) inbv(port)
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#define outb(port, data) outbv(port, data)
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#else /* __GNUC >= 2 */
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/*
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* The following complications are to get around gcc not having a
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* constraint letter for the range 0..255. We still put "d" in the
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* constraint because "i" isn't a valid constraint when the port
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* isn't constant. This only matters for -O0 because otherwise
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* the non-working version gets optimized away.
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*
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* Use an expression-statement instead of a conditional expression
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* because gcc-2.6.0 would promote the operands of the conditional
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* and produce poor code for "if ((inb(var) & const1) == const2)".
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*/
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#define inb(port) ({ \
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u_char _data; \
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if (__builtin_constant_p((int) (port)) && (port) < 256ul) \
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_data = inbc(port); \
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else \
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_data = inbv(port); \
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_data; })
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#define outb(port, data) \
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(__builtin_constant_p((int) (port)) && (port) < 256ul \
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? outbc(port, data) : outbv(port, data))
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static __inline u_char
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inbc(u_int port)
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{
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u_char data;
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__asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
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return (data);
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}
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static __inline void
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outbc(u_int port, u_char data)
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{
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__asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port)));
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}
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#endif /* __GNUC <= 2 */
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static __inline u_char
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inbv(u_int port)
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{
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u_char data;
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/*
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* We use %%dx and not %1 here because i/o is done at %dx and not at
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* %edx, while gcc generates inferior code (movw instead of movl)
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* if we tell it to load (u_short) port.
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*/
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__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
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return (data);
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}
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static __inline u_long
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inl(u_int port)
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{
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u_long data;
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__asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port));
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return (data);
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}
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static __inline void
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insb(u_int port, void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; insb"
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: : "d" (port), "D" (addr), "c" (cnt)
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: "di", "cx", "memory");
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}
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static __inline void
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insw(u_int port, void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; insw"
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: : "d" (port), "D" (addr), "c" (cnt)
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: "di", "cx", "memory");
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}
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static __inline void
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insl(u_int port, void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; insl"
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: : "d" (port), "D" (addr), "c" (cnt)
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: "di", "cx", "memory");
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}
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static __inline u_short
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inw(u_int port)
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{
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u_short data;
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__asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port));
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return (data);
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}
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static __inline unsigned
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loadandclear(u_int *addr)
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{
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u_int result;
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__asm __volatile("xorl %0,%0; xchgl %1,%0"
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: "=&r" (result) : "m" (*addr));
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return (result);
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}
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static __inline void
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outbv(u_int port, u_char data)
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{
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u_char al;
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/*
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* Use an unnecessary assignment to help gcc's register allocator.
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* This make a large difference for gcc-1.40 and a tiny difference
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* for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
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* best results. gcc-2.6.0 can't handle this.
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*/
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al = data;
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__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
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}
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static __inline void
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outl(u_int port, u_long data)
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{
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/*
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* outl() and outw() aren't used much so we haven't looked at
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* possible micro-optimizations such as the unnecessary
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* assignment for them.
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*/
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__asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
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}
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static __inline void
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outsb(u_int port, void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; outsb"
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: : "d" (port), "S" (addr), "c" (cnt)
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: "si", "cx");
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}
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static __inline void
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outsw(u_int port, void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; outsw"
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: : "d" (port), "S" (addr), "c" (cnt)
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: "si", "cx");
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}
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static __inline void
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outsl(u_int port, void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; outsl"
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: : "d" (port), "S" (addr), "c" (cnt)
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: "si", "cx");
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}
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static __inline void
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outw(u_int port, u_short data)
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{
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__asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port));
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}
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static __inline void
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pmap_update(void)
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{
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u_long temp;
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/*
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* This should be implemented as load_cr3(rcr3()) when load_cr3()
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* is inlined.
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*/
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__asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp));
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}
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static __inline u_long
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rcr2(void)
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{
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u_long data;
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__asm __volatile("movl %%cr2,%0" : "=r" (data));
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return (data);
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}
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static __inline u_long
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read_eflags(void)
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{
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u_long ef;
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__asm __volatile("pushfl; popl %0" : "=r" (ef));
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return (ef);
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}
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static __inline void
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write_eflags(u_long ef)
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{
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__asm __volatile("pushl %0; popfl" : : "r" (ef));
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}
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/*
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* XXX queue stuff belongs elsewhere.
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*/
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struct quehead {
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struct quehead *qh_link;
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struct quehead *qh_rlink;
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};
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static __inline void
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insque(void *a, void *b)
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{
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struct quehead *element = a, *head = b;
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element->qh_link = head->qh_link;
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element->qh_rlink = head;
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head->qh_link = element;
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element->qh_link->qh_rlink = element;
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}
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static __inline void
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remque(void *a)
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{
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struct quehead *element = a;
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element->qh_link->qh_rlink = element->qh_rlink;
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element->qh_rlink->qh_link = element->qh_link;
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element->qh_rlink = 0;
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}
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#else /* !__GNUC__ */
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int bdb __P((void));
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void disable_intr __P((void));
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void enable_intr __P((void));
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u_char inb __P((u_int port));
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u_long inl __P((u_int port));
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void insb __P((u_int port, void *addr, size_t cnt));
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void insl __P((u_int port, void *addr, size_t cnt));
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void insw __P((u_int port, void *addr, size_t cnt));
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u_short inw __P((u_int port));
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u_int loadandclear __P((u_int *addr));
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void outb __P((u_int port, u_char data));
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void outl __P((u_int port, u_long data));
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void outsb __P((u_int port, void *addr, size_t cnt));
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void outsl __P((u_int port, void *addr, size_t cnt));
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void outsw __P((u_int port, void *addr, size_t cnt));
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void outw __P((u_int port, u_short data));
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void pmap_update __P((void));
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u_long read_eflags __P((void));
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u_long rcr2 __P((void));
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void write_eflags __P((u_long ef));
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void insque __P((void *a, void *b));
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void remque __P((void *a));
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#endif /* __GNUC__ */
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/*
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* XXX the following declarations document garbage in support.s.
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* gcc hasn't needed _divsi* for years.
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* bcopy[bwx]() was used by pccons but isn't used now.
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*/
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int __divsi3 __P((int factor1, int factor2));
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u_int __udivsi3 __P((u_int factor1, u_int factor2));
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void bcopyb __P((const void *from, void *to, size_t len));
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void bcopyw __P((const void *from, void *to, size_t len));
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void bcopyx __P((const void *from, void *to, size_t len,
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int stride));
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#if 0
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/*
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* These functions in support.s are declared elsewhere.
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*/
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void bcopy __P((const void *from, void *to, size_t len));
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void blkclr __P((void *buf, size_t len));
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void bzero __P((void *buf, size_t len));
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int copyin __P((void *udaddr, void *kaddr, size_t len));
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int copyinstr __P((void *udaddr, void *kaddr, size_t len,
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size_t *lencopied));
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int copyout __P((void *kaddr, void *udaddr, size_t len));
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int copystr __P((void *kfaddr, void *kdaddr, size_t len,
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size_t *lencopied));
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int fubyte __P((void *base));
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int fuswintr __P((void *base));
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int fuibyte __P((void *base));
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int fuword __P((void *base));
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struct region_descriptor;
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void lgdt __P((struct region_descriptor *rdp));
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void lidt __P((struct region_descriptor *rdp));
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void lldt __P((u_short sel));
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/*
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* longjmp() and setjmp() are only used by ddb. They probably shouldn't
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* shouldn't be supported in the kernel.
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*/
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#include <setjmp.h>
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void longjmp __P((jmp_buf jb, int rv));
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void ovbcopy __P((const void *from, void *to, size_t len);
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int setjmp __P((jmp_buf jb));
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struct soft_segment_descriptor;
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union descriptor;
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int ssdtosd __P((struct soft_segment_descriptor *ssdp,
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union descriptor *sdp));
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int subyte __P((void *base, int byte));
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int suibyte __P((void *base, int byte));
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int suswintr __P((void *base, int word));
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int suword __P((void *base, int word));
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/*
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* These functions in support.s are declared elsewhere, but never used.
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* A silly amount of effort went into copyoutstr(). It's not worth
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* maintaining, since the string length is usually known so copyout
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* works better, or is easy to find so copyout() can be used.
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*/
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int copyoutstr __P((void *kaddr, void *udaddr, size_t len,
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size_t *lencopied));
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int fuiword __P((void *base));
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int suiword __P((void *base, int word));
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/*
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* These functions in support.s are also in libkern.a and are declared in
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* libkern.h.
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* ffs() is built in to gcc-2 and was buggy in gcc-2.4.5 so we may may the
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* buggy version if we don't replace it by an inline.
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*/
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int bcmp __P((const void *b1, const void *b2, size_t length));
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int ffs __P((int mask));
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#endif /* 0 */
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/*
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* These variables and functions in support.s are used.
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*/
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extern u_int atdevbase; /* offset in virtual memory of ISA io mem */
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void filli __P((int pat, void *base, size_t cnt));
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void fillw __P((int /*u_short*/ pat, void *base, size_t cnt));
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int fusword __P((void *base));
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void load_cr0 __P((u_long cr0));
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void load_cr3 __P((u_long cr3));
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void ltr __P((u_short sel));
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u_int rcr0 __P((void));
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u_long rcr3 __P((void));
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int rtcin __P((int val));
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/*
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* These functions are NOT in support.s and should be declared elsewhere.
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*/
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void Debugger __P((const char *msg));
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u_long kvtop __P((void *addr));
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typedef void alias_for_inthand_t __P((u_int cs, u_int ef, u_int esp,
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u_int ss));
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void setidt __P((int idx, alias_for_inthand_t *func, int typ,
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int dpl));
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#endif /* !_MACHINE_CPUFUNC_H_ */
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