8c6f8f3d5b
64bit and 32bit ABIs. As a side-effect, it enables AVX on capable
CPUs.
In particular:
- Query the CPU support for XSAVE, list of the supported extensions
and the required size of FPU save area. The hw.use_xsave tunable is
provided for disabling XSAVE, and hw.xsave_mask may be used to
select the enabled extensions.
- Remove the FPU save area from PCB and dynamically allocate the
(run-time sized) user save area on the top of the kernel stack,
right above the PCB. Reorganize the thread0 PCB initialization to
postpone it after BSP is queried for save area size.
- The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as
well. FPU state is only useful for suspend, where it is saved in
dynamically allocated suspfpusave area.
- Use XSAVE and XRSTOR to save/restore FPU state, if supported and
enabled.
- Define new mcontext_t flag _MC_HASFPXSTATE, indicating that
mcontext_t has a valid pointer to out-of-struct extended FPU
state. Signal handlers are supplied with stack-allocated fpu
state. The sigreturn(2) and setcontext(2) syscall honour the flag,
allowing the signal handlers to inspect and manipilate extended
state in the interrupted context.
- The getcontext(2) never returns extended state, since there is no
place in the fixed-sized mcontext_t to place variable-sized save
area. And, since mcontext_t is embedded into ucontext_t, makes it
impossible to fix in a reasonable way. Instead of extending
getcontext(2) syscall, provide a sysarch(2) facility to query
extended FPU state.
- Add ptrace(2) support for getting and setting extended state; while
there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries.
- Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to
consumers, making it opaque. Internally, struct fpu_kern_ctx now
contains a space for the extended state. Convert in-kernel consumers
of fpu_kern KPI both on i386 and amd64.
First version of the support for AVX was submitted by Tim Bird
<tim.bird am sony com> on behalf of Sony. This version was written
from scratch.
Tested by: pho (previous version), Yamagi Burmeister <lists yamagi org>
MFC after: 1 month
120 lines
4.2 KiB
C
120 lines
4.2 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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/*
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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_pminfo;
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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_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 char kstack[];
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extern char sigcode[];
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extern int szsigcode;
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extern uint64_t *vm_page_dump;
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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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typedef void alias_for_inthand_t(u_int cs, u_int ef, u_int esp, u_int ss);
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struct pcb;
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struct savefpu;
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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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void *alloc_fpusave(int flags);
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void amd64_syscall(struct thread *td, int traced);
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void busdma_swi(void);
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void cpu_setregs(void);
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void ctx_fpusave(void *);
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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 ld_ds(void) __asm(__STRING(ld_ds));
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void ld_es(void) __asm(__STRING(ld_es));
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void ld_fs(void) __asm(__STRING(ld_fs));
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void ld_gs(void) __asm(__STRING(ld_gs));
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void ld_fsbase(void) __asm(__STRING(ld_fsbase));
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void ld_gsbase(void) __asm(__STRING(ld_gsbase));
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void ds_load_fault(void) __asm(__STRING(ds_load_fault));
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void es_load_fault(void) __asm(__STRING(es_load_fault));
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void fs_load_fault(void) __asm(__STRING(fs_load_fault));
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void gs_load_fault(void) __asm(__STRING(gs_load_fault));
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void fsbase_load_fault(void) __asm(__STRING(fsbase_load_fault));
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void gsbase_load_fault(void) __asm(__STRING(gsbase_load_fault));
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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 initializecpu(void);
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void initializecpucache(void);
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void fillw(int /*u_short*/ pat, void *base, size_t cnt);
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void fpstate_drop(struct thread *td);
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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 pagecopy(void *from, void *to);
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void pagezero(void *addr);
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void setidt(int idx, alias_for_inthand_t *func, int typ, int dpl, int ist);
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int user_dbreg_trap(void);
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void minidumpsys(struct dumperinfo *);
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struct savefpu *get_pcb_user_save_td(struct thread *td);
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struct savefpu *get_pcb_user_save_pcb(struct pcb *pcb);
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struct pcb *get_pcb_td(struct thread *td);
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#endif /* !_MACHINE_MD_VAR_H_ */
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