/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* * Copyright (c) 1994 The University of Utah and * the Computer Systems Laboratory at the University of Utah (CSL). * All rights reserved. * * Permission to use, copy, modify and distribute this software is hereby * granted provided that (1) source code retains these copyright, permission, * and disclaimer notices, and (2) redistributions including binaries * reproduce the notices in supporting documentation, and (3) all advertising * materials mentioning features or use of this software display the following * acknowledgement: ``This product includes software developed by the * Computer Systems Laboratory at the University of Utah.'' * * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * CSL requests users of this software to return to csl-dist@cs.utah.edu any * improvements that they make and grant CSL redistribution rights. * */ /* * File: vm_param.h * Author: Avadis Tevanian, Jr. * Date: 1985 * * I386 machine dependent virtual memory parameters. * Most of the declarations are preceeded by I386_ (or i386_) * which is OK because only I386 specific code will be using * them. */ #ifndef _MACH_I386_VM_PARAM_H_ #define _MACH_I386_VM_PARAM_H_ #define BYTE_SIZE 8 /* byte size in bits */ #define I386_PGBYTES 4096 /* bytes per 80386 page */ #define I386_PGSHIFT 12 /* number of bits to shift for pages */ /* * Convert bytes to pages and convert pages to bytes. * No rounding is used. */ #define i386_btop(x) (((unsigned)(x)) >> I386_PGSHIFT) #define machine_btop(x) i386_btop(x) #define i386_ptob(x) (((unsigned)(x)) << I386_PGSHIFT) /* * Round off or truncate to the nearest page. These will work * for either addresses or counts. (i.e. 1 byte rounds to 1 page * bytes. */ #define i386_round_page(x) ((((unsigned)(x)) + I386_PGBYTES - 1) & \ ~(I386_PGBYTES-1)) #define i386_trunc_page(x) (((unsigned)(x)) & ~(I386_PGBYTES-1)) #define VM_MIN_ADDRESS ((vm_offset_t) 0) #define VM_MAX_ADDRESS ((vm_offset_t) 0xc0000000U) #define LINEAR_KERNEL_ADDRESS ((vm_offset_t) 0xc0000000) #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t) 0x00000000U) #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t) 0x3fffffffU) #define VM_MIN_KERNEL_LOADED_ADDRESS ((vm_offset_t) 0x0c000000U) #define VM_MAX_KERNEL_LOADED_ADDRESS ((vm_offset_t) 0x1fffffffU) /* FIXME - always leave like this? */ #define INTSTACK_SIZE (I386_PGBYTES*4) #define KERNEL_STACK_SIZE (I386_PGBYTES*4) #if 0 /* FIXME */ #include <norma_vm.h> #include <task_swapper.h> #include <thread_swapper.h> #if defined(AT386) #include <i386/cpuid.h> #endif #if !NORMA_VM #if !TASK_SWAPPER && !THREAD_SWAPPER #define KERNEL_STACK_SIZE (I386_PGBYTES/2) #else /* stack needs to be a multiple of page size to get unwired when swapped */ #define KERNEL_STACK_SIZE (I386_PGBYTES) #endif /* TASK || THREAD SWAPPER */ #define INTSTACK_SIZE (I386_PGBYTES) /* interrupt stack size */ #else /* NORMA_VM */ #define KERNEL_STACK_SIZE (I386_PGBYTES*2) #define INTSTACK_SIZE (I386_PGBYTES*2) /* interrupt stack size */ #endif /* NORMA_VM */ #endif /* MACH_KERNEL */ /* * Conversion between 80386 pages and VM pages */ #define trunc_i386_to_vm(p) (atop(trunc_page(i386_ptob(p)))) #define round_i386_to_vm(p) (atop(round_page(i386_ptob(p)))) #define vm_to_i386(p) (i386_btop(ptoa(p))) /* * Physical memory is mapped 1-1 with virtual memory starting * at VM_MIN_KERNEL_ADDRESS. */ #define phystokv(a) ((vm_offset_t)(a) + VM_MIN_KERNEL_ADDRESS) /* * For 386 only, ensure that pages are installed in the * kernel_pmap with VM_PROT_WRITE enabled. This avoids * code in pmap_enter that disallows a read-only mapping * in the kernel's pmap. (See ri-osc CR1387.) * * An entry in kernel_pmap is made only by the kernel or * a collocated server -- by definition (;-)), the requester * is trusted code. If it asked for read-only access, * it won't attempt a write. We don't have to enforce the * restriction. (Naturally, this assumes that any collocated * server will _not_ depend on trapping write accesses to pages * mapped read-only; this cannot be made to work in the current * i386-inspired pmap model.) */ /*#if defined(AT386) #define PMAP_ENTER_386_CHECK \ if (cpuid_family == CPUID_FAMILY_386) #else -- FIXME? We're only running on Pentiums or better */ #define PMAP_ENTER_386_CHECK /*#endif*/ #define PMAP_ENTER(pmap, virtual_address, page, protection, wired) \ MACRO_BEGIN \ vm_prot_t __prot__ = \ (protection) & ~(page)->page_lock; \ \ PMAP_ENTER_386_CHECK \ if ((pmap) == kernel_pmap) \ __prot__ |= VM_PROT_WRITE; \ pmap_enter( \ (pmap), \ (virtual_address), \ (page)->phys_addr, \ __prot__, \ (wired) \ ); \ MACRO_END #endif /* _MACH_I386_VM_PARAM_H_ */