5e921ff49e
This saves 320 bytes of the precious stack space. The only negative aspect of the change I can think of is that the struct thread increased by 320 bytes obviously, and that 320 bytes are not swapped out anymore. I believe the freed stack space is much more important than that. Also, current struct thread size is 1392 bytes on amd64, so UMA will allocate two thread structures per (4KB) slab, which leaves a space for pcb without increasing zone memory use. Reviewed by: alc, markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D22138
92 lines
3.6 KiB
C
92 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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 uint64_t *vm_page_dump;
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extern int hw_lower_amd64_sharedpage;
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extern int hw_ibrs_disable;
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extern int hw_ssb_disable;
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extern int nmi_flush_l1d_sw;
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extern int syscall_ret_l1d_flush_mode;
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extern vm_paddr_t intel_graphics_stolen_base;
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extern vm_paddr_t intel_graphics_stolen_size;
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/*
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* The file "conf/ldscript.amd64" defines the symbol "kernphys". Its
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* value is the physical address at which the kernel is loaded.
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*/
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extern char kernphys[];
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struct savefpu;
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struct sysentvec;
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void amd64_conf_fast_syscall(void);
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void amd64_db_resume_dbreg(void);
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void amd64_lower_shared_page(struct sysentvec *);
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void amd64_bsp_pcpu_init1(struct pcpu *pc);
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void amd64_bsp_pcpu_init2(uint64_t rsp0);
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void amd64_bsp_ist_init(struct pcpu *pc);
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void amd64_syscall(struct thread *td, int traced);
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void amd64_syscall_ret_flush_l1d(int error);
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void amd64_syscall_ret_flush_l1d_recalc(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 flush_l1d_sw_abi(void);
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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 fpstate_drop(struct thread *td);
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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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void sse2_pagezero(void *addr);
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void set_top_of_stack_td(struct thread *td);
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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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void pci_early_quirks(void);
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#endif /* !_MACHINE_MD_VAR_H_ */
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