FreeBSD/Linux Kernel Cross Reference
sys/pc/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 double word */
    #define BY2PG           4096                    /* bytes per page */
    #define WD2PG           (BY2PG/BY2WD)           /* words per page */
    #define BY2XPG          (4096*1024)     /* bytes per big page */
    #define PGSHIFT         12                      /* log(BY2PG) */
    #define ROUND(s, sz)    (((s)+((sz)-1))&~((sz)-1))
    #define PGROUND(s)      ROUND(s, BY2PG)
    #define BLOCKALIGN      8
    
    #define MAXMACH         8                       /* max # cpus system can run */
    #define KSTACK          4096                    /* Size of kernel stack */
    
    /*
     * Time
     */
    #define HZ              (100)                   /* clock frequency */
    #define MS2HZ           (1000/HZ)               /* millisec per clock tick */
    #define TK2SEC(t)       ((t)/HZ)                /* ticks to seconds */
    
    /*
     *  Address spaces
     */
    #define KZERO           0xF0000000              /* base of kernel address space */
    #define KTZERO          (KZERO+0x100000)                /* first address in kernel text - 9load sits below */
    #define VPT                     (KZERO-VPTSIZE)
    #define VPTSIZE         BY2XPG
    #define NVPT            (VPTSIZE/BY2WD)
    #define KMAP            (VPT-KMAPSIZE)
    #define KMAPSIZE        BY2XPG
    #define VMAP            (KMAP-VMAPSIZE)
    #define VMAPSIZE        (0x10000000-VPTSIZE-KMAPSIZE)
    #define UZERO           0                       /* base of user address space */
    #define UTZERO          (UZERO+BY2PG)           /* first address in user text */
    #define USTKTOP         (VMAP-BY2PG)            /* byte just beyond user stack */
    #define USTKSIZE        (16*1024*1024)          /* size of user stack */
    #define TSTKTOP         (USTKTOP-USTKSIZE)      /* end of new stack in sysexec */
    #define TSTKSIZ         100     /* pages in new stack; limits exec args */
    
    /*
     * Fundamental addresses - bottom 64kB saved for return to real mode
     */
    #define CONFADDR        (KZERO+0x1200)          /* info passed from boot loader */
    #define TMPADDR         (KZERO+0x2000)          /* used for temporary mappings */
    #define APBOOTSTRAP     (KZERO+0x3000)          /* AP bootstrap code */
    #define RMUADDR         (KZERO+0x7C00)          /* real mode Ureg */
    #define RMCODE          (KZERO+0x8000)          /* copy of first page of KTEXT */
    #define RMBUF           (KZERO+0x9000)          /* buffer for user space - known to vga */
    #define IDTADDR         (KZERO+0x10800)         /* idt */
    #define REBOOTADDR      (0x11000)               /* reboot code - physical address */
    #define CPU0PDB         (KZERO+0x12000)         /* bootstrap processor PDB */
    #define CPU0PTE         (KZERO+0x13000)         /* bootstrap processor PTE's for 0-4MB */
    #define CPU0GDT         (KZERO+0x14000)         /* bootstrap processor GDT */
    #define MACHADDR        (KZERO+0x15000)         /* as seen by current processor */
    #define CPU0MACH        (KZERO+0x16000)         /* Mach for bootstrap processor */
    #define MACHSIZE        BY2PG
    #define CPU0PTE1        (KZERO+0x17000)         /* bootstrap processor PTE's for 4MB-8MB */
    #define CPU0END         (CPU0PTE1+BY2PG)
    /*
     * N.B.  ramscan knows that CPU0END is the end of reserved data
     * N.B.  _startPADDR knows that CPU0PDB is the first reserved page
     * and that there are 6 of them.
     */
    
    /*
     *  known x86 segments (in GDT) and their selectors
     */
    #define NULLSEG 0       /* null segment */
    #define KDSEG   1       /* kernel data/stack */
    #define KESEG   2       /* kernel executable */ 
    #define UDSEG   3       /* user data/stack */
    #define UESEG   4       /* user executable */
    #define TSSSEG  5       /* task segment */
    #define APMCSEG         6       /* APM code segment */
    #define APMCSEG16       7       /* APM 16-bit code segment */
    #define APMDSEG         8       /* APM data segment */
    #define KESEG16         9       /* kernel executable 16-bit */
    #define NGDT            10      /* number of GDT entries required */
    /* #define      APM40SEG        8       /* APM segment 0x40 */
    
    #define SELGDT  (0<<2)  /* selector is in gdt */
    #define SELLDT  (1<<2)  /* selector is in ldt */
    
    #define SELECTOR(i, t, p)       (((i)<<3) | (t) | (p))
    
    #define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
    #define KDSEL   SELECTOR(KDSEG, SELGDT, 0)
    #define KESEL   SELECTOR(KESEG, SELGDT, 0)
    #define UESEL   SELECTOR(UESEG, SELGDT, 3)
    #define UDSEL   SELECTOR(UDSEG, SELGDT, 3)
   #define TSSSEL  SELECTOR(TSSSEG, SELGDT, 0)
   #define APMCSEL         SELECTOR(APMCSEG, SELGDT, 0)
   #define APMCSEL16       SELECTOR(APMCSEG16, SELGDT, 0)
   #define APMDSEL         SELECTOR(APMDSEG, SELGDT, 0)
   /* #define      APM40SEL        SELECTOR(APM40SEG, SELGDT, 0) */
   
   /*
    *  fields in segment descriptors
    */
   #define SEGDATA (0x10<<8)       /* data/stack segment */
   #define SEGEXEC (0x18<<8)       /* executable segment */
   #define SEGTSS  (0x9<<8)        /* TSS segment */
   #define SEGCG   (0x0C<<8)       /* call gate */
   #define SEGIG   (0x0E<<8)       /* interrupt gate */
   #define SEGTG   (0x0F<<8)       /* trap gate */
   #define SEGTYPE (0x1F<<8)
   
   #define SEGP    (1<<15)         /* segment present */
   #define SEGPL(x) ((x)<<13)      /* priority level */
   #define SEGB    (1<<22)         /* granularity 1==4k (for expand-down) */
   #define SEGG    (1<<23)         /* granularity 1==4k (for other) */
   #define SEGE    (1<<10)         /* expand down */
   #define SEGW    (1<<9)          /* writable (for data/stack) */
   #define SEGR    (1<<9)          /* readable (for code) */
   #define SEGD    (1<<22)         /* default 1==32bit (for code) */
   
   /*
    *  virtual MMU
    */
   #define PTEMAPMEM       (1024*1024)     
   #define PTEPERTAB       (PTEMAPMEM/BY2PG)
   #define SEGMAPSIZE      1984
   #define SSEGMAPSIZE     16
   #define PPN(x)          ((x)&~(BY2PG-1))
   
   /*
    *  physical MMU
    */
   #define PTEVALID        (1<<0)
   #define PTEWT           (1<<3)
   #define PTEUNCACHED     (1<<4)
   #define PTEWRITE        (1<<1)
   #define PTERONLY        (0<<1)
   #define PTEKERNEL       (0<<2)
   #define PTEUSER         (1<<2)
   #define PTESIZE         (1<<7)
   #define PTEGLOBAL       (1<<8)
   
   /*
    * Macros for calculating offsets within the page directory base
    * and page tables. 
    */
   #define PDX(va)         ((((ulong)(va))>>22) & 0x03FF)
   #define PTX(va)         ((((ulong)(va))>>12) & 0x03FF)
   
   #define getpgcolor(a)   0
   

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