ref: 6a651b42ac8cdd639e6258dd24f097132983b4dc
dir: /sys/src/9/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 KZERO 0x80000000 /* base of kernel address space */ #define KTZERO (KZERO+0x400000) /* first address in kernel text */ #define USTKTOP KZERO /* byte just beyond user stack */ #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)