1991/0706/pc/mem.h (diff list | history)

1991/0705/sys/src/9/pc/mem.h:5,11 – 1991/0706/sys/src/9/pc/mem.h:5,10 (short | long | prev | next)
1991/0625		/* * Sizes */
1991/0613
1991/0625		#define BI2BY 8 /* bits per byte */ #define BI2WD 32 /* bits per word */ #define BY2WD 4 /* bytes per word */
1991/0705/sys/src/9/pc/mem.h:20,26 – 1991/0706/sys/src/9/pc/mem.h:19,24
1991/0705		* Time * Clock frequency is ??? HZ
1991/0613		*/
1991/0705		#define HZ (18) /* clock frequency */ #define MS2HZ (54) /* millisec per clock tick */ #define TK2SEC(t) ((t)*10/185) /* ticks to seconds */
1991/0705/sys/src/9/pc/mem.h:30,36 – 1991/0706/sys/src/9/pc/mem.h:28,33
1991/0613		/*
1991/0625		* Fundamental addresses
1991/0613		*/
1991/0625		#define USERADDR 0xC0000000 #define UREGADDR (USERADDR+BY2PG-4*16)
1991/0705/sys/src/9/pc/mem.h:40,46 – 1991/0706/sys/src/9/pc/mem.h:37,42
1991/0625		* User is at 0-2GB * Kernel is at 2GB-4GB
1991/0613		*/
1991/0625		#define UZERO 0 /* base of user address space */ #define UTZERO (UZERO+BY2PG) /* first address in user text */ #define TSTKTOP USERADDR /* end of new stack in sysexec */
1991/0705/sys/src/9/pc/mem.h:55,63 – 1991/0706/sys/src/9/pc/mem.h:51,58
1991/0625		#define isphys(x) ((x)&KZERO)
1991/0613		/* * known segments (in GDT) and their selectors
1991/0706		* known 80386 segments (in GDT) and their selectors
1991/0613		*/
1991/0625		#define NULLSEG 0 /* null segment */
1991/0703		#define KDSEG 1 /* kernel data/stack */ #define KESEG 2 /* kernel executable */
1991/0705/sys/src/9/pc/mem.h:64,69 – 1991/0706/sys/src/9/pc/mem.h:59,66
1991/0703		#define UDSEG 3 /* user data/stack */ #define UESEG 4 /* user executable */
1991/0625		#define SYSGATE 5 /* system call gate */
1991/0706		#define RDSEG 6 /* reboot data/stack */ #define RESEG 7 /* reboot executable */
1991/0625		#define SELGDT (0<<3) /* selector is in gdt */ #define SELLDT (1<<3) /* selector is in ldt */
1991/0705/sys/src/9/pc/mem.h:77,82 – 1991/0706/sys/src/9/pc/mem.h:74,81
1991/0613		#define UESEL SELECTOR(UESEG, SELGDT, 3) #define UDSEL SELECTOR(UDSEG, SELGDT, 3) #define USSEL SELECTOR(UDSEG, SELGDT, 3)
1991/0706		#define RDSEL SELECTOR(RDSEG, SELGDT, 0) #define RESEL SELECTOR(RESEG, SELGDT, 0)
1991/0613
1991/0627		/* * fields in segment descriptors
1991/0705/sys/src/9/pc/mem.h:96,98 – 1991/0706/sys/src/9/pc/mem.h:95,104
1991/0627		#define SEGW (1<<9) /* writable (for data/stack) */ #define SEGR (1<<9) /* readable (for code) */ #define SEGD (1<<22) /* default 1==32bit (for code) */
1991/0706		/* * virtual MMU entries */ #define PTEMAPMEM (1024*1024) /* ??? */ #define SEGMAPSIZE 16 /* ??? */ #define PTEPERTAB (PTEMAPMEM/BY2PG) /* ??? */