1991/1214/pc/mem.h (diff list | history)

1991/1210/sys/src/9/pc/mem.h:43,49 – 1991/1214/sys/src/9/pc/mem.h:43,49 (short | long | prev | next)
1991/0718		#define KZERO 0x80000000 /* base of kernel address space */ #define KTZERO KZERO /* first address in kernel text */ #define USERADDR 0xC0000000 /* struct User */
1991/0807		#define UREGADDR (USERADDR+BY2PG-4*17)
1991/1214		#define UREGADDR (USERADDR+BY2PG-4*19)
1991/0718		#define TSTKTOP USERADDR /* end of new stack in sysexec */
1991/0625		#define TSTKSIZ 10
1991/0718		#define USTKTOP (TSTKTOP-TSTKSIZ*BY2PG) /* byte just beyond user stack */
1991/1210/sys/src/9/pc/mem.h:62,69 – 1991/1214/sys/src/9/pc/mem.h:62,68
1991/0703		#define KESEG 2 /* kernel executable */ #define UDSEG 3 /* user data/stack */ #define UESEG 4 /* user executable */
1991/0625		#define SYSGATE 5 /* system call gate */
1991/0719		#define TSSSEG 6 /* task segment */
1991/1214		#define TSSSEG 5 /* task segment */
1991/0625		#define SELGDT (0<<3) /* selector is in gdt */ #define SELLDT (1<<3) /* selector is in ldt */