ref: f5cc6fbe3a7bcf8bdb002c646ddd519014afafd2
dir: /os/boot/puma/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 BY2PG 4096 /* bytes per page */ #define WD2PG (BY2PG/BY2WD) /* words per page */ #define PGSHIFT 12 /* log(BY2PG) */ #define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1)) #define MAXMACH 1 /* max # cpus system can run */ /* * Time */ #define HZ (20) /* clock frequency */ #define MS2HZ (1000/HZ) /* millisec per clock tick */ #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */ #define TK2MS(t) ((((ulong)(t))*1000)/HZ) /* ticks to milliseconds */ #define MS2TK(t) ((((ulong)(t))*HZ)/1000) /* milliseconds to ticks */ /* * Fundamental addresses */ /* * Address spaces * * Kernel is at 0x00008000 */ #define KZERO 0x00000000 /* base of kernel address space */ #define KTZERO KZERO /* first address in kernel text */ #define MACHSIZE 4096