319117fd57
It is coded according to the Intel document 336996-001, reading of the patches posted on lkml, and some additional consultations with Intel. For existing processors, you need a microcode update which adds IBRS CPU features, and to manually enable it by setting the tunable/sysctl hw.ibrs_disable to 0. Current status can be checked in sysctl hw.ibrs_active. The mitigation might be inactive if the CPU feature is not patched in, or if CPU reports that IBRS use is not required, by IA32_ARCH_CAP_IBRS_ALL bit. Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D14029
148 lines
4.4 KiB
C
148 lines
4.4 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 _X86_X86_VAR_H_
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#define _X86_X86_VAR_H_
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/*
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* Miscellaneous machine-dependent declarations.
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*/
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extern long Maxmem;
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extern u_int basemem;
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extern int busdma_swi_pending;
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extern u_int cpu_exthigh;
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extern u_int cpu_feature;
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extern u_int cpu_feature2;
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extern u_int amd_feature;
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extern u_int amd_feature2;
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extern u_int amd_rascap;
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extern u_int amd_pminfo;
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extern u_int amd_extended_feature_extensions;
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extern u_int via_feature_rng;
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extern u_int via_feature_xcrypt;
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extern u_int cpu_clflush_line_size;
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extern u_int cpu_stdext_feature;
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extern u_int cpu_stdext_feature2;
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extern u_int cpu_stdext_feature3;
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extern uint64_t cpu_ia32_arch_caps;
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extern u_int cpu_fxsr;
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extern u_int cpu_high;
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extern u_int cpu_id;
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extern u_int cpu_max_ext_state_size;
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extern u_int cpu_mxcsr_mask;
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extern u_int cpu_procinfo;
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extern u_int cpu_procinfo2;
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extern char cpu_vendor[];
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extern u_int cpu_vendor_id;
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extern u_int cpu_mon_mwait_flags;
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extern u_int cpu_mon_min_size;
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extern u_int cpu_mon_max_size;
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extern u_int cpu_maxphyaddr;
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extern char ctx_switch_xsave[];
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extern u_int hv_high;
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extern char hv_vendor[];
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extern char kstack[];
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extern char sigcode[];
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extern int szsigcode;
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extern int vm_page_dump_size;
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extern int workaround_erratum383;
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extern int _udatasel;
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extern int _ucodesel;
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extern int _ucode32sel;
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extern int _ufssel;
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extern int _ugssel;
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extern int use_xsave;
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extern uint64_t xsave_mask;
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extern u_int max_apic_id;
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extern int pti;
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struct pcb;
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struct thread;
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struct reg;
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struct fpreg;
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struct dbreg;
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struct dumperinfo;
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struct trapframe;
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/*
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* The interface type of the interrupt handler entry point cannot be
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* expressed in C. Use simplest non-variadic function type as an
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* approximation.
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*/
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typedef void alias_for_inthand_t(void);
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/*
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* Returns the maximum physical address that can be used with the
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* current system.
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*/
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static __inline vm_paddr_t
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cpu_getmaxphyaddr(void)
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{
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#if defined(__i386__) && !defined(PAE)
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return (0xffffffff);
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#else
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return ((1ULL << cpu_maxphyaddr) - 1);
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#endif
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}
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void *alloc_fpusave(int flags);
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void busdma_swi(void);
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bool cpu_mwait_usable(void);
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void cpu_probe_amdc1e(void);
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void cpu_setregs(void);
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void dump_add_page(vm_paddr_t);
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void dump_drop_page(vm_paddr_t);
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void finishidentcpu(void);
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void identify_cpu1(void);
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void identify_cpu2(void);
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void identify_hypervisor(void);
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void initializecpu(void);
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void initializecpucache(void);
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bool fix_cpuid(void);
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void fillw(int /*u_short*/ pat, void *base, size_t cnt);
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int is_physical_memory(vm_paddr_t addr);
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int isa_nmi(int cd);
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void handle_ibrs_entry(void);
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void handle_ibrs_exit(void);
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void hw_ibrs_recalculate(void);
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void nmi_call_kdb(u_int cpu, u_int type, struct trapframe *frame);
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void nmi_call_kdb_smp(u_int type, struct trapframe *frame);
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void nmi_handle_intr(u_int type, struct trapframe *frame);
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void pagecopy(void *from, void *to);
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void printcpuinfo(void);
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int pti_get_default(void);
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int user_dbreg_trap(void);
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int minidumpsys(struct dumperinfo *);
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struct pcb *get_pcb_td(struct thread *td);
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#endif
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