FreeBSD/Linux Kernel Cross Reference
sys/alphapc/mem.h

     /*
      * Memory and machine-specific definitions.  Used in C and assembler.
      */
     
     /*
      * Sizes
      */
     #define BI2BY           8                       /* bits per byte */
     #define BI2WD           32                      /* bits per word */
    #define BY2WD           4                       /* bytes per word */
    #define BY2V            8                       /* bytes per vlong */
    #define BY2PG           8192                    /* bytes per page */
    #define WD2PG           (BY2PG/BY2WD)           /* words per page */
    #define PGSHIFT         13                      /* log(BY2PG) */
    #define ROUND(s, sz)    (((s)+((sz)-1))&~((sz)-1))
    #define PGROUND(s)      ROUND(s, BY2PG)
    #define BLOCKALIGN      8
    
    #define BY2PTE          8                       /* bytes per pte entry */
    #define PTE2PG          (BY2PG/BY2PTE)          /* pte entries per page */
    
    #define MAXMACH         1                       /* max # cpus system can run */
    #define KSTACK          4096                    /* Size of kernel stack */
    
    /*
     * Time
     */
    #define HZ              100                     /* clock frequency */
    #define MS2HZ           (1000/HZ)
    #define TK2SEC(t)       ((t)/HZ)                /* ticks to seconds */
    
    /*
     * Magic registers
     */
    #define MACH            15              /* R15 is m-> */
    #define USER            14              /* R14 is up-> */
    
    
    /*
     * Fundamental addresses
     */
    /* XXX MACHADDR, MACHP(n) */
    
    /*
     * MMU
     *
     * A PTE is 64 bits, but a ulong is 32!  Hence we encode
     * the PTEs specially for fault.c, and decode them in putmmu().
     * This means that we can only map the first 2G of physical
     * space via putmmu() - ie only physical memory, not devices.
     */
    #define PTEVALID        0x3301
    #define PTEKVALID       0x1101
    #define PTEASM          0x0010
    #define PTEGH(s)        ((s)<<5)
    #define PTEWRITE        0
    #define PTERONLY        0x4
    #define PTEUNCACHED     0
    #define PPN(n)          (((n)>>PGSHIFT)<<14)
    #define FIXPTE(x)       ((((uvlong)(x)>>14)<<32)|((x) & 0x3fff))
    #define PTEPFN(pa)      (((uvlong)(pa)>>PGSHIFT)<<32)
    #define NCOLOR          1
    #define getpgcolor(a)   0
    
    #define PTEMAPMEM       (1024*1024)     
    #define PTEPERTAB       (PTEMAPMEM/BY2PG)
    #define SEGMAPSIZE      512
    #define SSEGMAPSIZE     16
    
    /*
     * Address spaces
     */
    #define UZERO   0                       /* base of user address space */
    #define UTZERO  (UZERO+BY2PG)           /* first address in user text */
    #define USTKTOP (TSTKTOP-TSTKSIZ*BY2PG) /* byte just beyond user stack */
    #define TSTKTOP KZERO                   /* top of temporary stack */
    #define TSTKSIZ 100
    #define KZERO   0x80000000              /* base of kernel address space */
    #define KTZERO  (KZERO+0x400000)        /* first address in kernel text */
    #define USTKSIZE        (4*1024*1024)   /* size of user stack */
    
    /*
     * Processor Status (as returned by rdps)
     */
    #define UMODE   0x8
    #define IPL     0x7
    
    
    #define isphys(x) (((ulong)x&KZERO)!=0)

Cache object: ebba8b8a22e2efe9c7108259bbb9d824