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vmparam.h revision 1.4 
      1 
      2 #define USRTEXT         NBPG
      3 #define USRSTACK        (0-NBPG)
      4 
      5 /*
      6  * Virtual memory related constants, all in bytes
      7  */
      8 #ifndef MAXTSIZ
      9 #define	MAXTSIZ		(6*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		(16*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 
     72 /*
     73  * Mach derived constants
     74  */
     75 
     76 /* user/kernel map constants */
     77 #define VM_MIN_ADDRESS		((vm_offset_t)0)
     78 #define VM_MAXUSER_ADDRESS	((vm_offset_t)0x0E000000)
     79 #define VM_MAX_ADDRESS		((vm_offset_t)0xFFF00000)
     80 #define VM_MIN_KERNEL_ADDRESS	((vm_offset_t)0x0E004000)
     81 #define VM_MAX_KERNEL_ADDRESS	((vm_offset_t)0x0FE00000) /* mon start */
     82 
     83 /* virtual sizes (bytes) for various kernel submaps */
     84 #define VM_MBUF_SIZE		(NMBCLUSTERS*MCLBYTES)
     85 #define VM_KMEM_SIZE		(NKMEMCLUSTERS*CLBYTES)
     86 #define VM_PHYS_SIZE		(USRIOSIZE*CLBYTES)
     87