1991/0703/pc/mmu.c (diff list | history)

1991/0703/sys/src/9/pc/mmu.c:49,59 – 1991/0706/sys/src/9/pc/mmu.c:49,61 (short | long | prev | next)
1991/0703		#define DATASEG(p) { 0xFFFF, SEGG|SEGB|(0xF<<16)|SEGP|SEGPL(p)|SEGDATA|SEGW } #define EXECSEG(p) { 0xFFFF, SEGG|SEGD|(0xF<<16)|SEGP|SEGPL(p)|SEGEXEC|SEGR } #define CALLGATE(s,o,p) { (o)&0xFFFF|((s)<<16), (o)&0xFFFF0000|SEGP|SEGPL(p)|SEGCG }
1991/0706		#define D16SEG(p) { 0xFFFF, (0x0<<16)|SEGP|SEGPL(p)|SEGDATA|SEGW } #define E16SEG(p) { 0xFFFF, (0x0<<16)|SEGP|SEGPL(p)|SEGEXEC|SEGR }
1991/0703		/*
1991/0613		* global descriptor table describing all segments */
1991/0703		Segdesc gdt[6] =
1991/0706		Segdesc gdt[] =
1991/0612		{
1991/0613		[NULLSEG] { 0, 0}, /* null descriptor */ [KDSEG] DATASEG(0), /* kernel data/stack */
1991/0703/sys/src/9/pc/mmu.c:61,66 – 1991/0706/sys/src/9/pc/mmu.c:63,70
1991/0613		[UDSEG] DATASEG(3), /* user data/stack */
1991/0703		[UESEG] EXECSEG(3), /* user code */ [SYSGATE] CALLGATE(KESEL,0,3), /* call gate for system calls */
1991/0706		[RDSEG] D16SEG(0), /* reboot data/stack */ [RESEG] E16SEG(0), /* reboot code */
1991/0613		};
1991/0703		void