1 /* $NetBSD: vmparam.h,v 1.10 2017/04/08 18:05:36 scole Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 35 */ 36 37 #ifndef _VMPARAM_H_ 38 #define _VMPARAM_H_ 39 40 #define USRSTACK VM_MAX_ADDRESS /* XXX: Revisit vm address space. */ 41 42 /* 43 * Virtual memory related constants, all in bytes 44 */ 45 #ifndef MAXTSIZ 46 #define MAXTSIZ (1<<30) /* max text size (1G) */ 47 #endif 48 #ifndef DFLDSIZ 49 #define DFLDSIZ (1<<27) /* initial data size (128M) */ 50 #endif 51 #ifndef MAXDSIZ 52 #define MAXDSIZ (1<<30) /* max data size (1G) */ 53 #endif 54 #ifndef DFLSSIZ 55 #define DFLSSIZ (1<<21) /* initial stack size (2M) */ 56 #endif 57 #ifndef MAXSSIZ 58 #define MAXSSIZ (1<<28) /* max stack size (256M) */ 59 #endif 60 #ifndef SGROWSIZ 61 #define SGROWSIZ (128UL*1024) /* amount to grow stack */ 62 #endif 63 64 #define IA64_VM_MINKERN_REGION 4 65 66 /* 67 * PTEs for mapping user space into the kernel for phyio operations. 68 * 64 pte's are enough to cover 8 disks * MAXBSIZE. 69 */ 70 #ifndef USRIOSIZE 71 #define USRIOSIZE 64 72 #endif 73 74 /* 75 * Manipulating region bits of an address. 76 */ 77 #define IA64_RR_BASE(n) (((uint64_t) (n)) << 61) 78 #define IA64_RR_MASK(x) ((x) & ((1L << 61) - 1)) 79 80 #define IA64_PHYS_TO_RR6(x) ((x) | IA64_RR_BASE(6)) 81 #define IA64_PHYS_TO_RR7(x) ((x) | IA64_RR_BASE(7)) 82 83 /* 84 * The Itanium architecture defines that all implementations support at 85 * least 51 virtual address bits (i.e. IMPL_VA_MSB=50). The unimplemented 86 * bits are sign-extended from VA{IMPL_VA_MSB}. As such, there's a gap in 87 * the virtual address range, which extends at most from 0x0004000000000000 88 * to 0x1ffbffffffffffff. We define the top half of a region in terms of 89 * this worst-case gap. 90 */ 91 #define IA64_REGION_GAP_START 0x0004000000000000 92 #define IA64_REGION_GAP_EXTEND 0x1ffc000000000000 93 94 /* 95 * Parameters for Pre-Boot Virtual Memory (PBVM). 96 * The kernel, its modules and metadata are loaded in the PBVM by the loader. 97 * The PBVM consists of pages for which the mapping is maintained in a page 98 * table. The page table is at least 1 EFI page large (i.e. 4KB), but can be 99 * larger to accommodate more PBVM. The maximum page table size is 1MB. With 100 * 8 bytes per page table entry, this means that the PBVM has at least 512 101 * pages and at most 128K pages. 102 * The GNU toolchain (in particular GNU ld) does not support an alignment 103 * larger than 64K. This means that we cannot guarantee page alignment for 104 * a page size that's larger than 64K. We do want to have text and data in 105 * different pages, which means that the maximum usable page size is 64KB. 106 * Consequently: 107 * The maximum total PBVM size is 8GB -- enough for a DVD image. A page table 108 * of a single EFI page (4KB) allows for 32MB of PBVM. 109 * 110 * The kernel is given the PA and size of the page table that provides the 111 * mapping of the PBVM. The page table itself is assumed to be mapped at a 112 * known virtual address and using a single translation wired into the CPU. 113 * As such, the page table is assumed to be a power of 2 and naturally aligned. 114 * The kernel also assumes that a good portion of the kernel text is mapped 115 * and wired into the CPU, but does not assume that the mapping covers the 116 * whole of PBVM. 117 */ 118 #define IA64_PBVM_RR IA64_VM_MINKERN_REGION 119 #define IA64_PBVM_BASE \ 120 (IA64_RR_BASE(IA64_PBVM_RR) + IA64_REGION_GAP_EXTEND) 121 122 #define IA64_PBVM_PGTBL_MAXSZ 1048576 123 #define IA64_PBVM_PGTBL \ 124 (IA64_RR_BASE(IA64_PBVM_RR + 1) - IA64_PBVM_PGTBL_MAXSZ) 125 126 #define IA64_PBVM_PAGE_SHIFT 16 /* 64KB */ 127 #define IA64_PBVM_PAGE_SIZE (1 << IA64_PBVM_PAGE_SHIFT) 128 #define IA64_PBVM_PAGE_MASK (IA64_PBVM_PAGE_SIZE - 1) 129 130 #define IA64_ID_PAGE_SHIFT 28 /* 256M */ 131 #define IA64_ID_PAGE_SIZE (1 << IA64_ID_PAGE_SHIFT) 132 #define IA64_ID_PAGE_MASK (IA64_ID_PAGE_SIZE-1) 133 134 /* XXX freebsd uses 135 #define IA64_BACKINGSTORE (USRSTACK - (2 * MAXSSIZ) - PAGE_SIZE) 136 */ 137 #define IA64_BACKINGSTORE IA64_RR_BASE(4) 138 139 #define PAGE_SHIFT 14 /* 16K pages by default. */ 140 #define PAGE_SIZE (1 << PAGE_SHIFT) 141 #define PAGE_MASK (PAGE_SIZE - 1) 142 143 /* user/kernel map constants */ 144 #define VM_MIN_ADDRESS ((vaddr_t)0) 145 #define VM_MAX_ADDRESS ((vaddr_t) IA64_RR_BASE(5)) 146 #define VM_GATEWAY_SIZE PAGE_SIZE 147 #define VM_MAXUSER_ADDRESS (VM_MAX_ADDRESS + VM_GATEWAY_SIZE) 148 #define VM_MIN_KERNEL_ADDRESS VM_MAXUSER_ADDRESS 149 #define VM_INIT_KERNEL_ADDRESS IA64_RR_BASE(IA64_VM_MINKERN_REGION + 1) 150 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t) (IA64_RR_BASE(6) - 1)) 151 152 #define VM_PHYSSEG_MAX 16 /* XXX: */ 153 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 154 155 #define VM_NFREELIST 1 /* XXX: */ 156 #define VM_FREELIST_DEFAULT 0 /* XXX: */ 157 158 /* virtual sizes (bytes) for various kernel submaps */ 159 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 160 161 #endif /* _VMPARAM_H_ */ 162