1991/0717/pc/mem.h (diff list | history)

1991/0716/sys/src/9/pc/mem.h:59,65 – 1991/0717/sys/src/9/pc/mem.h:59,66 (short | long | prev | next)
1991/0703		#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 */
1991/0717		#define RESEG 7 /* reboot executable */ #define TSSSEG 8 /* task segment */
1991/0625		#define SELGDT (0<<3) /* selector is in gdt */ #define SELLDT (1<<3) /* selector is in ldt */
1991/0716/sys/src/9/pc/mem.h:73,78 – 1991/0717/sys/src/9/pc/mem.h:74,80
1991/0613		#define UDSEL SELECTOR(UDSEG, SELGDT, 3)
1991/0706		#define RDSEL SELECTOR(RDSEG, SELGDT, 0) #define RESEL SELECTOR(RESEG, SELGDT, 0)
1991/0717		#define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
1991/0613
1991/0627		/* * fields in segment descriptors
1991/0716/sys/src/9/pc/mem.h:79,84 – 1991/0717/sys/src/9/pc/mem.h:81,87
1991/0627		*/ #define SEGDATA (0x10<<8) /* data/stack segment */ #define SEGEXEC (0x18<<8) /* executable segment */
1991/0717		#define SEGTSS (0x9<<8) /* TSS segment */
1991/0627		#define SEGCG (0x0C<<8) /* call gate */ #define SEGIG (0x0E<<8) /* interrupt gate */ #define SEGTG (0x0F<<8) /* task gate */