vmparam3.h revision 1.6
1 2#define USRTEXT NBPG 3#define USRSTACK 0x0E000000 4 5/* 6 * Virtual memory related constants, all in bytes 7 */ 8#ifndef MAXTSIZ 9#define MAXTSIZ (8*1024*1024) /* max text size */ 10#endif 11#ifndef DFLDSIZ 12#define DFLDSIZ (8*1024*1024) /* initial data size limit */ 13#endif 14#ifndef MAXDSIZ 15#define MAXDSIZ (32*1024*1024) /* max data size */ 16#endif 17#ifndef DFLSSIZ 18#define DFLSSIZ (512*1024) /* initial stack size limit */ 19#endif 20#ifndef MAXSSIZ 21#define MAXSSIZ (MAXDSIZ) /* max stack size */ 22#endif 23 24/* 25 * Default sizes of swap allocation chunks (see dmap.h). 26 * The actual values may be changed in vminit() based on MAXDSIZ. 27 * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024. 28 * DMMIN should be at least ctod(1) so that vtod() works. 29 * vminit() insures this. 30 */ 31#define DMMIN 32 /* smallest swap allocation */ 32#define DMMAX 4096 /* largest potential swap allocation */ 33 34/* 35 * PTEs for mapping user space into the kernel for phyio operations. 36 * [this figure is based on the assumption that you can put ptes in real 37 * memory. this is a false assumption on a sun3] 38 * 39 */ 40#ifndef USRIOSIZE 41#define USRIOSIZE 1 42#endif 43 44/* 45 * The time for a process to be blocked before being very swappable. 46 * This is a number of seconds which the system takes as being a non-trivial 47 * amount of real time. You probably shouldn't change this; 48 * it is used in subtle ways (fractions and multiples of it are, that is, like 49 * half of a ``long time'', almost a long time, etc.) 50 * It is related to human patience and other factors which don't really 51 * change over time. 52 */ 53#define MAXSLP 20 54 55/* 56 * A swapped in process is given a small amount of core without being bothered 57 * by the page replacement algorithm. Basically this says that if you are 58 * swapped in you deserve some resources. We protect the last SAFERSS 59 * pages against paging and will just swap you out rather than paging you. 60 * Note that each process has at least UPAGES+CLSIZE pages which are not 61 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this 62 * number just means a swapped in process is given around 25k bytes. 63 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81), 64 * so we loan each swapped in process memory worth 100$, or just admit 65 * that we don't consider it worthwhile and swap it out to disk which costs 66 * $30/mb or about $0.75. 67 */ 68#define SAFERSS 4 /* nominal ``small'' resident set size 69 protected against replacement */ 70 71#define DVMA_SPACE_SIZE 0x00100000 72#define DVMA_SPACE_START 0x0FD00000 73#define DVMA_SPACE_END 0x0FE00000 /* mon start */ 74 75/* 76 * Mach derived constants 77 */ 78 79/* user/kernel map constants */ 80#define VM_MIN_ADDRESS ((vm_offset_t)0) 81#define VM_MAXUSER_ADDRESS ((vm_offset_t)0x0E000000) 82#define VM_MAX_ADDRESS ((vm_offset_t)0x0FFF00000) 83#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0x0E004000) 84#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0x0FD00000) /* dvma start */ 85 86/* virtual sizes (bytes) for various kernel submaps */ 87#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES) 88#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES) 89#define VM_PHYS_SIZE (USRIOSIZE*CLBYTES) 90