d3c968bf84
some still useful bits of the reverted revision. The problem with the committed fix is that there are still issues with returning from NMI, when NMI interrupted kernel in a moment where the kernel segments selectors were still not loaded into registers. If this happens, the NMI return would loose the userspace selectors because r323722 does not reload segment registers on return to kernel mode. Fixing the problem is complicated. Since an alternative approach to handle the original bug exists, it makes sence to stop adding more complexity. Discussed with: bde Sponsored by: The FreeBSD Foundation MFC after: 1 week
74 lines
3.0 KiB
C
74 lines
3.0 KiB
C
/*-
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* Copyright (c) 1995 Bruce D. Evans.
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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. Neither the name of the author nor the names of 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 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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#ifndef _MACHINE_MD_VAR_H_
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#define _MACHINE_MD_VAR_H_
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#include <x86/x86_var.h>
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extern u_int cyrix_did;
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#if defined(I586_CPU) && !defined(NO_F00F_HACK)
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extern int has_f00f_bug;
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#endif
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#ifdef COMPAT_FREEBSD4
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extern int szfreebsd4_sigcode;
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#endif
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#ifdef COMPAT_43
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extern int szosigcode;
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#endif
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extern uint32_t *vm_page_dump;
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struct segment_descriptor;
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union savefpu;
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void bcopyb(const void *from, void *to, size_t len);
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void cpu_switch_load_gs(void) __asm(__STRING(cpu_switch_load_gs));
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void doreti_iret(void) __asm(__STRING(doreti_iret));
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void doreti_iret_fault(void) __asm(__STRING(doreti_iret_fault));
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void doreti_popl_ds(void) __asm(__STRING(doreti_popl_ds));
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void doreti_popl_ds_fault(void) __asm(__STRING(doreti_popl_ds_fault));
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void doreti_popl_es(void) __asm(__STRING(doreti_popl_es));
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void doreti_popl_es_fault(void) __asm(__STRING(doreti_popl_es_fault));
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void doreti_popl_fs(void) __asm(__STRING(doreti_popl_fs));
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void doreti_popl_fs_fault(void) __asm(__STRING(doreti_popl_fs_fault));
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void fill_based_sd(struct segment_descriptor *sdp, uint32_t base);
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void i686_pagezero(void *addr);
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void sse2_pagezero(void *addr);
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void init_AMD_Elan_sc520(void);
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vm_paddr_t kvtop(void *addr);
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void panicifcpuunsupported(void);
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void ppro_reenable_apic(void);
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void setidt(int idx, alias_for_inthand_t *func, int typ, int dpl, int selec);
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union savefpu *get_pcb_user_save_td(struct thread *td);
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union savefpu *get_pcb_user_save_pcb(struct pcb *pcb);
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#endif /* !_MACHINE_MD_VAR_H_ */
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