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
147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 2002 Mike Barcroft <mike@FreeBSD.org>
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its 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 REGENTS 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 REGENTS 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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* From: @(#)ansi.h 8.2 (Berkeley) 1/4/94
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* From: @(#)types.h 8.3 (Berkeley) 1/5/94
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* $FreeBSD$
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*/
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#ifndef _MACHINE__TYPES_H_
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#define _MACHINE__TYPES_H_
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#ifndef _SYS_CDEFS_H_
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#error this file needs sys/cdefs.h as a prerequisite
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#endif
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#include <machine/_limits.h>
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#define __NO_STRICT_ALIGNMENT
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/*
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* Basic types upon which most other types are built.
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*/
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typedef signed char __int8_t;
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typedef unsigned char __uint8_t;
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typedef short __int16_t;
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typedef unsigned short __uint16_t;
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typedef int __int32_t;
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typedef unsigned int __uint32_t;
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#ifdef __LP64__
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typedef long __int64_t;
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typedef unsigned long __uint64_t;
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#else
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__extension__
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typedef long long __int64_t;
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__extension__
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typedef unsigned long long __uint64_t;
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#endif
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/*
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* Standard type definitions.
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*/
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#ifdef __LP64__
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typedef __int32_t __clock_t; /* clock()... */
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typedef __int64_t __critical_t;
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#ifndef _STANDALONE
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typedef double __double_t;
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typedef float __float_t;
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#endif
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typedef __int64_t __intfptr_t;
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typedef __int64_t __intptr_t;
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#else
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typedef unsigned long __clock_t;
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typedef __int32_t __critical_t;
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#ifndef _STANDALONE
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typedef long double __double_t;
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typedef long double __float_t;
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#endif
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typedef __int32_t __intfptr_t;
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typedef __int32_t __intptr_t;
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#endif
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typedef __int64_t __intmax_t;
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typedef __int32_t __int_fast8_t;
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typedef __int32_t __int_fast16_t;
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typedef __int32_t __int_fast32_t;
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typedef __int64_t __int_fast64_t;
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typedef __int8_t __int_least8_t;
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typedef __int16_t __int_least16_t;
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typedef __int32_t __int_least32_t;
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typedef __int64_t __int_least64_t;
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#ifdef __LP64__
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typedef __int64_t __ptrdiff_t; /* ptr1 - ptr2 */
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typedef __int64_t __register_t;
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typedef __int64_t __segsz_t; /* segment size (in pages) */
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typedef __uint64_t __size_t; /* sizeof() */
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typedef __int64_t __ssize_t; /* byte count or error */
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typedef __int64_t __time_t; /* time()... */
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typedef __uint64_t __uintfptr_t;
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typedef __uint64_t __uintptr_t;
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#else
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typedef __int32_t __ptrdiff_t;
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typedef __int32_t __register_t;
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typedef __int32_t __segsz_t;
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typedef __uint32_t __size_t;
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typedef __int32_t __ssize_t;
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typedef __int32_t __time_t;
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typedef __uint32_t __uintfptr_t;
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typedef __uint32_t __uintptr_t;
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#endif
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typedef __uint64_t __uintmax_t;
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typedef __uint32_t __uint_fast8_t;
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typedef __uint32_t __uint_fast16_t;
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typedef __uint32_t __uint_fast32_t;
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typedef __uint64_t __uint_fast64_t;
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typedef __uint8_t __uint_least8_t;
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typedef __uint16_t __uint_least16_t;
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typedef __uint32_t __uint_least32_t;
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typedef __uint64_t __uint_least64_t;
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#ifdef __LP64__
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typedef __uint64_t __u_register_t;
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typedef __uint64_t __vm_offset_t;
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typedef __uint64_t __vm_paddr_t;
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typedef __uint64_t __vm_size_t;
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#else
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typedef __uint32_t __u_register_t;
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typedef __uint32_t __vm_offset_t;
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typedef __uint64_t __vm_paddr_t;
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typedef __uint32_t __vm_size_t;
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#endif
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typedef int ___wchar_t;
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#define __WCHAR_MIN __INT_MIN /* min value for a wchar_t */
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#define __WCHAR_MAX __INT_MAX /* max value for a wchar_t */
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#endif /* !_MACHINE__TYPES_H_ */
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