9a52756044
Effectively all i386 kernels now have two pmaps compiled in: one managing PAE pagetables, and another non-PAE. The implementation is selected at cold time depending on the CPU features. The vm_paddr_t is always 64bit now. As result, nx bit can be used on all capable CPUs. Option PAE only affects the bus_addr_t: it is still 32bit for non-PAE configs, for drivers compatibility. Kernel layout, esp. max kernel address, low memory PDEs and max user address (same as trampoline start) are now same for PAE and for non-PAE regardless of the type of page tables used. Non-PAE kernel (when using PAE pagetables) can handle physical memory up to 24G now, larger memory requires re-tuning the KVA consumers and instead the code caps the maximum at 24G. Unfortunately, a lot of drivers do not use busdma(9) properly so by default even 4G barrier is not easy. There are two tunables added: hw.above4g_allow and hw.above24g_allow, the first one is kept enabled for now to evaluate the status on HEAD, second is only for dev use. i386 now creates three freelists if there is any memory above 4G, to allow proper bounce pages allocation. Also, VM_KMEM_SIZE_SCALE changed from 3 to 1. The PAE_TABLES kernel config option is retired. In collaboarion with: pho Discussed with: emaste Reviewed by: markj MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D18894
86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1995 Bruce D. Evans.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the author nor the names of contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_MD_VAR_H_
|
|
#define _MACHINE_MD_VAR_H_
|
|
|
|
#include <x86/x86_var.h>
|
|
|
|
extern u_int cyrix_did;
|
|
#if defined(I586_CPU) && !defined(NO_F00F_HACK)
|
|
extern int has_f00f_bug;
|
|
#endif
|
|
#ifdef COMPAT_FREEBSD4
|
|
extern int szfreebsd4_sigcode;
|
|
#endif
|
|
#ifdef COMPAT_43
|
|
extern int szosigcode;
|
|
extern int sz_lcall_tramp;
|
|
#endif
|
|
extern uint32_t *vm_page_dump;
|
|
extern vm_offset_t proc0kstack;
|
|
extern uintptr_t setidt_disp;
|
|
|
|
struct segment_descriptor;
|
|
union savefpu;
|
|
|
|
int cp_slow0(vm_offset_t uva, size_t len, bool write,
|
|
void (*f)(vm_offset_t, void *), void *arg);
|
|
void cpu_switch_load_gs(void) __asm(__STRING(cpu_switch_load_gs));
|
|
void copyout_init_tramp(void);
|
|
void doreti_iret(void) __asm(__STRING(doreti_iret));
|
|
void doreti_iret_fault(void) __asm(__STRING(doreti_iret_fault));
|
|
void doreti_popl_ds(void) __asm(__STRING(doreti_popl_ds));
|
|
void doreti_popl_ds_fault(void) __asm(__STRING(doreti_popl_ds_fault));
|
|
void doreti_popl_es(void) __asm(__STRING(doreti_popl_es));
|
|
void doreti_popl_es_fault(void) __asm(__STRING(doreti_popl_es_fault));
|
|
void doreti_popl_fs(void) __asm(__STRING(doreti_popl_fs));
|
|
void doreti_popl_fs_fault(void) __asm(__STRING(doreti_popl_fs_fault));
|
|
void fill_based_sd(struct segment_descriptor *sdp, uint32_t base);
|
|
void i686_pagezero(void *addr);
|
|
void sse2_pagezero(void *addr);
|
|
int minidumpsys_nopae(struct dumperinfo *);
|
|
int minidumpsys_pae(struct dumperinfo *);
|
|
void init_AMD_Elan_sc520(void);
|
|
vm_paddr_t kvtop(void *addr);
|
|
void panicifcpuunsupported(void);
|
|
void ppro_reenable_apic(void);
|
|
void set_fsbase(struct thread *td, uint32_t base);
|
|
void set_gsbase(struct thread *td, uint32_t base);
|
|
void setidt(int idx, alias_for_inthand_t *func, int typ, int dpl, int selec);
|
|
void setidt_nodisp(int idx, uintptr_t func, int typ, int dpl, int selec);
|
|
union savefpu *get_pcb_user_save_td(struct thread *td);
|
|
union savefpu *get_pcb_user_save_pcb(struct pcb *pcb);
|
|
|
|
#endif /* !_MACHINE_MD_VAR_H_ */
|