3bbf3512ad
compiling as an amd64 support binary. They will return EINVAL on an amd64 kernel, but this simplifies other #ifdefs that were getting a bit nasty.
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/*-
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* Copyright (c) 2004 Doug Rabson
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <string.h>
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#include <stdint.h>
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#include <machine/segments.h>
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#include <machine/sysarch.h>
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void
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_set_tp(void *tp)
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{
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union descriptor ldt;
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int error, sel;
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error = i386_set_gsbase(tp);
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if (error == 0)
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return;
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memset(&ldt, 0, sizeof(ldt));
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ldt.sd.sd_lolimit = 0xffff; /* 4G limit */
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ldt.sd.sd_lobase = ((uintptr_t)tp) & 0xffffff;
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ldt.sd.sd_type = SDT_MEMRWA;
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ldt.sd.sd_dpl = SEL_UPL;
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ldt.sd.sd_p = 1; /* present */
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ldt.sd.sd_hilimit = 0xf; /* 4G limit */
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ldt.sd.sd_def32 = 1; /* 32 bit */
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ldt.sd.sd_gran = 1; /* limit in pages */
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ldt.sd.sd_hibase = (((uintptr_t)tp) >> 24) & 0xff;
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sel = i386_set_ldt(LDT_AUTO_ALLOC, &ldt, 1);
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__asm __volatile("movl %0,%%gs" : : "rm" ((sel << 3) | 7));
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}
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