f6108b6158
Default off due to information disclosure on multi-user systems. Submitted by: cperciva Reviewed by: jhb
781 lines
16 KiB
C
781 lines
16 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm.
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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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* 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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* $FreeBSD$
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*/
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/*
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* Functions to provide access to special i386 instructions.
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* This in included in sys/systm.h, and that file should be
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* used in preference to this.
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*/
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#ifndef _MACHINE_CPUFUNC_H_
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#define _MACHINE_CPUFUNC_H_
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#ifndef _SYS_CDEFS_H_
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#error this file needs sys/cdefs.h as a prerequisite
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#endif
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struct region_descriptor;
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#define readb(va) (*(volatile u_int8_t *) (va))
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#define readw(va) (*(volatile u_int16_t *) (va))
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#define readl(va) (*(volatile u_int32_t *) (va))
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#define readq(va) (*(volatile u_int64_t *) (va))
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#define writeb(va, d) (*(volatile u_int8_t *) (va) = (d))
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#define writew(va, d) (*(volatile u_int16_t *) (va) = (d))
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#define writel(va, d) (*(volatile u_int32_t *) (va) = (d))
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#define writeq(va, d) (*(volatile u_int64_t *) (va) = (d))
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#if defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE)
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static __inline void
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breakpoint(void)
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{
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__asm __volatile("int $3");
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}
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static __inline u_int
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bsfl(u_int mask)
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{
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u_int result;
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__asm __volatile("bsfl %1,%0" : "=r" (result) : "rm" (mask));
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return (result);
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}
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static __inline u_long
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bsfq(u_long mask)
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{
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u_long result;
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__asm __volatile("bsfq %1,%0" : "=r" (result) : "rm" (mask));
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return (result);
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}
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static __inline u_int
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bsrl(u_int mask)
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{
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u_int result;
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__asm __volatile("bsrl %1,%0" : "=r" (result) : "rm" (mask));
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return (result);
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}
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static __inline u_long
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bsrq(u_long mask)
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{
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u_long result;
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__asm __volatile("bsrq %1,%0" : "=r" (result) : "rm" (mask));
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return (result);
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}
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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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do_cpuid(u_int ax, u_int *p)
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{
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__asm __volatile("cpuid"
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: "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
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: "0" (ax));
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}
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static __inline void
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cpuid_count(u_int ax, u_int cx, u_int *p)
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{
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__asm __volatile("cpuid"
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: "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
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: "0" (ax), "c" (cx));
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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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#ifdef _KERNEL
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#define HAVE_INLINE_FFS
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#define ffs(x) __builtin_ffs(x)
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#define HAVE_INLINE_FFSL
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static __inline int
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ffsl(long mask)
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{
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return (mask == 0 ? mask : (int)bsfq((u_long)mask) + 1);
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}
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#define HAVE_INLINE_FLS
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static __inline int
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fls(int mask)
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{
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return (mask == 0 ? mask : (int)bsrl((u_int)mask) + 1);
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}
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#define HAVE_INLINE_FLSL
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static __inline int
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flsl(long mask)
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{
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return (mask == 0 ? mask : (int)bsrq((u_long)mask) + 1);
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}
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#endif /* _KERNEL */
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static __inline void
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halt(void)
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{
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__asm __volatile("hlt");
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}
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#if !defined(__GNUCLIKE_BUILTIN_CONSTANT_P) || __GNUCLIKE_ASM < 3
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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 /* __GNUCLIKE_BUILTIN_CONSTANT_P && __GNUCLIKE_ASM >= 3 */
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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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* The unnecessary test `(port) < 0x10000' is to generate a warning if
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* the `port' has type u_short or smaller. Such types are pessimal.
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* This actually only works for signed types. The range check is
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* careful to avoid generating warnings.
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*/
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#define inb(port) __extension__ ({ \
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u_char _data; \
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if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
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&& (port) < 0x10000) \
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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(port) && ((port) & 0xffff) < 0x100 \
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&& (port) < 0x10000 \
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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 /* __GNUCLIKE_BUILTIN_CONSTANT_P && __GNUCLIKE_ASM >= 3*/
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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_int
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inl(u_int port)
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{
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u_int 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" (addr), "+c" (cnt)
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: "d" (port)
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: "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" (addr), "+c" (cnt)
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: "d" (port)
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: "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" (addr), "+c" (cnt)
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: "d" (port)
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: "memory");
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}
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static __inline void
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invd(void)
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{
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__asm __volatile("invd");
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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 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_int 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, const void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; outsb"
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: "+S" (addr), "+c" (cnt)
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: "d" (port));
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}
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static __inline void
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outsw(u_int port, const void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; outsw"
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: "+S" (addr), "+c" (cnt)
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: "d" (port));
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}
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static __inline void
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outsl(u_int port, const void *addr, size_t cnt)
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{
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__asm __volatile("cld; rep; outsl"
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: "+S" (addr), "+c" (cnt)
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: "d" (port));
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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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ia32_pause(void)
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{
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__asm __volatile("pause");
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}
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static __inline u_long
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read_rflags(void)
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{
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u_long rf;
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__asm __volatile("pushfq; popq %0" : "=r" (rf));
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return (rf);
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}
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static __inline u_int64_t
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rdmsr(u_int msr)
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{
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u_int32_t low, high;
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__asm __volatile("rdmsr" : "=a" (low), "=d" (high) : "c" (msr));
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return (low | ((u_int64_t)high << 32));
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}
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static __inline u_int64_t
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rdpmc(u_int pmc)
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{
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u_int32_t low, high;
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__asm __volatile("rdpmc" : "=a" (low), "=d" (high) : "c" (pmc));
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return (low | ((u_int64_t)high << 32));
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}
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static __inline u_int64_t
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rdtsc(void)
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{
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u_int32_t low, high;
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__asm __volatile("rdtsc" : "=a" (low), "=d" (high));
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return (low | ((u_int64_t)high << 32));
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}
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static __inline void
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wbinvd(void)
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{
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__asm __volatile("wbinvd");
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}
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static __inline void
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write_rflags(u_long rf)
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{
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__asm __volatile("pushq %0; popfq" : : "r" (rf));
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}
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static __inline void
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wrmsr(u_int msr, u_int64_t newval)
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{
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u_int32_t low, high;
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low = newval;
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high = newval >> 32;
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__asm __volatile("wrmsr" : : "a" (low), "d" (high), "c" (msr));
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}
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static __inline void
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load_cr0(u_long data)
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{
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__asm __volatile("movq %0,%%cr0" : : "r" (data));
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}
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static __inline u_long
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rcr0(void)
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{
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u_long data;
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__asm __volatile("movq %%cr0,%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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rcr2(void)
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{
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u_long data;
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__asm __volatile("movq %%cr2,%0" : "=r" (data));
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return (data);
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}
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static __inline void
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load_cr3(u_long data)
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{
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__asm __volatile("movq %0,%%cr3" : : "r" (data) : "memory");
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}
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static __inline u_long
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rcr3(void)
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{
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u_long data;
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__asm __volatile("movq %%cr3,%0" : "=r" (data));
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return (data);
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}
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static __inline void
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load_cr4(u_long data)
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{
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__asm __volatile("movq %0,%%cr4" : : "r" (data));
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}
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static __inline u_long
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rcr4(void)
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{
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u_long data;
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__asm __volatile("movq %%cr4,%0" : "=r" (data));
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return (data);
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}
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/*
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* Global TLB flush (except for thise for pages marked PG_G)
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*/
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static __inline void
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invltlb(void)
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{
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load_cr3(rcr3());
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}
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/*
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* TLB flush for an individual page (even if it has PG_G).
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* Only works on 486+ CPUs (i386 does not have PG_G).
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*/
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static __inline void
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invlpg(u_long addr)
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{
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__asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
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}
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static __inline u_int
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rfs(void)
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{
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u_int sel;
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__asm __volatile("movl %%fs,%0" : "=rm" (sel));
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return (sel);
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}
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static __inline u_int
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rgs(void)
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{
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u_int sel;
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__asm __volatile("movl %%gs,%0" : "=rm" (sel));
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return (sel);
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}
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static __inline u_int
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rss(void)
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{
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u_int sel;
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__asm __volatile("movl %%ss,%0" : "=rm" (sel));
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return (sel);
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}
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static __inline void
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load_ds(u_int sel)
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{
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__asm __volatile("movl %0,%%ds" : : "rm" (sel));
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}
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static __inline void
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load_es(u_int sel)
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{
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__asm __volatile("movl %0,%%es" : : "rm" (sel));
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}
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#ifdef _KERNEL
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/* This is defined in <machine/specialreg.h> but is too painful to get to */
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#ifndef MSR_FSBASE
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#define MSR_FSBASE 0xc0000100
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#endif
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static __inline void
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load_fs(u_int sel)
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{
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register u_int32_t fsbase __asm("ecx");
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/* Preserve the fsbase value across the selector load */
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fsbase = MSR_FSBASE;
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__asm __volatile("rdmsr; movl %0,%%fs; wrmsr"
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: : "rm" (sel), "c" (fsbase) : "eax", "edx");
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}
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#ifndef MSR_GSBASE
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#define MSR_GSBASE 0xc0000101
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#endif
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static __inline void
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load_gs(u_int sel)
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{
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register u_int32_t gsbase __asm("ecx");
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/*
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* Preserve the gsbase value across the selector load.
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* Note that we have to disable interrupts because the gsbase
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* being trashed happens to be the kernel gsbase at the time.
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*/
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gsbase = MSR_GSBASE;
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__asm __volatile("pushfq; cli; rdmsr; movl %0,%%gs; wrmsr; popfq"
|
|
: : "rm" (sel), "c" (gsbase) : "eax", "edx");
|
|
}
|
|
#else
|
|
/* Usable by userland */
|
|
static __inline void
|
|
load_fs(u_int sel)
|
|
{
|
|
__asm __volatile("movl %0,%%fs" : : "rm" (sel));
|
|
}
|
|
|
|
static __inline void
|
|
load_gs(u_int sel)
|
|
{
|
|
__asm __volatile("movl %0,%%gs" : : "rm" (sel));
|
|
}
|
|
#endif
|
|
|
|
static __inline void
|
|
lidt(struct region_descriptor *addr)
|
|
{
|
|
__asm __volatile("lidt (%0)" : : "r" (addr));
|
|
}
|
|
|
|
static __inline void
|
|
lldt(u_short sel)
|
|
{
|
|
__asm __volatile("lldt %0" : : "r" (sel));
|
|
}
|
|
|
|
static __inline void
|
|
ltr(u_short sel)
|
|
{
|
|
__asm __volatile("ltr %0" : : "r" (sel));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr0(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr0,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr0(u_int64_t dr0)
|
|
{
|
|
__asm __volatile("movq %0,%%dr0" : : "r" (dr0));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr1(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr1,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr1(u_int64_t dr1)
|
|
{
|
|
__asm __volatile("movq %0,%%dr1" : : "r" (dr1));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr2(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr2,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr2(u_int64_t dr2)
|
|
{
|
|
__asm __volatile("movq %0,%%dr2" : : "r" (dr2));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr3(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr3,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr3(u_int64_t dr3)
|
|
{
|
|
__asm __volatile("movq %0,%%dr3" : : "r" (dr3));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr4(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr4,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr4(u_int64_t dr4)
|
|
{
|
|
__asm __volatile("movq %0,%%dr4" : : "r" (dr4));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr5(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr5,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr5(u_int64_t dr5)
|
|
{
|
|
__asm __volatile("movq %0,%%dr5" : : "r" (dr5));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr6(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr6,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr6(u_int64_t dr6)
|
|
{
|
|
__asm __volatile("movq %0,%%dr6" : : "r" (dr6));
|
|
}
|
|
|
|
static __inline u_int64_t
|
|
rdr7(void)
|
|
{
|
|
u_int64_t data;
|
|
__asm __volatile("movq %%dr7,%0" : "=r" (data));
|
|
return (data);
|
|
}
|
|
|
|
static __inline void
|
|
load_dr7(u_int64_t dr7)
|
|
{
|
|
__asm __volatile("movq %0,%%dr7" : : "r" (dr7));
|
|
}
|
|
|
|
static __inline register_t
|
|
intr_disable(void)
|
|
{
|
|
register_t rflags;
|
|
|
|
rflags = read_rflags();
|
|
disable_intr();
|
|
return (rflags);
|
|
}
|
|
|
|
static __inline void
|
|
intr_restore(register_t rflags)
|
|
{
|
|
write_rflags(rflags);
|
|
}
|
|
|
|
#else /* !(__GNUCLIKE_ASM && __CC_SUPPORTS___INLINE) */
|
|
|
|
int breakpoint(void);
|
|
u_int bsfl(u_int mask);
|
|
u_int bsrl(u_int mask);
|
|
void disable_intr(void);
|
|
void do_cpuid(u_int ax, u_int *p);
|
|
void enable_intr(void);
|
|
void halt(void);
|
|
void ia32_pause(void);
|
|
u_char inb(u_int port);
|
|
u_int inl(u_int port);
|
|
void insb(u_int port, void *addr, size_t cnt);
|
|
void insl(u_int port, void *addr, size_t cnt);
|
|
void insw(u_int port, void *addr, size_t cnt);
|
|
register_t intr_disable(void);
|
|
void intr_restore(register_t rf);
|
|
void invd(void);
|
|
void invlpg(u_int addr);
|
|
void invltlb(void);
|
|
u_short inw(u_int port);
|
|
void lidt(struct region_descriptor *addr);
|
|
void lldt(u_short sel);
|
|
void load_cr0(u_long cr0);
|
|
void load_cr3(u_long cr3);
|
|
void load_cr4(u_long cr4);
|
|
void load_dr0(u_int64_t dr0);
|
|
void load_dr1(u_int64_t dr1);
|
|
void load_dr2(u_int64_t dr2);
|
|
void load_dr3(u_int64_t dr3);
|
|
void load_dr4(u_int64_t dr4);
|
|
void load_dr5(u_int64_t dr5);
|
|
void load_dr6(u_int64_t dr6);
|
|
void load_dr7(u_int64_t dr7);
|
|
void load_fs(u_int sel);
|
|
void load_gs(u_int sel);
|
|
void ltr(u_short sel);
|
|
void outb(u_int port, u_char data);
|
|
void outl(u_int port, u_int data);
|
|
void outsb(u_int port, const void *addr, size_t cnt);
|
|
void outsl(u_int port, const void *addr, size_t cnt);
|
|
void outsw(u_int port, const void *addr, size_t cnt);
|
|
void outw(u_int port, u_short data);
|
|
u_long rcr0(void);
|
|
u_long rcr2(void);
|
|
u_long rcr3(void);
|
|
u_long rcr4(void);
|
|
u_int64_t rdmsr(u_int msr);
|
|
u_int64_t rdpmc(u_int pmc);
|
|
u_int64_t rdr0(void);
|
|
u_int64_t rdr1(void);
|
|
u_int64_t rdr2(void);
|
|
u_int64_t rdr3(void);
|
|
u_int64_t rdr4(void);
|
|
u_int64_t rdr5(void);
|
|
u_int64_t rdr6(void);
|
|
u_int64_t rdr7(void);
|
|
u_int64_t rdtsc(void);
|
|
u_int read_rflags(void);
|
|
u_int rfs(void);
|
|
u_int rgs(void);
|
|
void wbinvd(void);
|
|
void write_rflags(u_int rf);
|
|
void wrmsr(u_int msr, u_int64_t newval);
|
|
|
|
#endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */
|
|
|
|
void reset_dbregs(void);
|
|
|
|
#endif /* !_MACHINE_CPUFUNC_H_ */
|