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350 lines
9.0 KiB
C
350 lines
9.0 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 1.44 1995/12/28 23:34:17 davidg 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" : : : "memory");
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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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: : "memory");
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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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#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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#endif /* __GNUC__ */
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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 bcopyb __P((const void *from, void *to, size_t len));
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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, int selec));
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#endif /* !_MACHINE_CPUFUNC_H_ */
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