1991/0626/pc/l.s (diff list | history)

1991/0625/sys/src/9/pc/l.s:1,25 – 1991/0626/sys/src/9/pc/l.s:1,39 (short | long | prev | next)
1991/0625		#include "mem.h"
1991/0614
1991/0626		/* * pointer to initial gdt (must be in first 64K of program) */
1991/0625		GLOBL gdtptr(SB),$6 DATA gdtptr+0(SB)/2, $(6*8)
1991/0626		DATA gdtptr+0(SB)/2, $(5*8)
1991/0625		DATA gdtptr+2(SB)/4, $gdt(SB)
1991/0614		/*
1991/0626		* pointer to idt (must be in first 64K of program) */ GLOBL idtptr(SB),$6 DATA idtptr+0(SB)/2, $(6*8) DATA idtptr+2(SB)/4, $idt(SB) /*
1991/0622		* boot processor
1991/0614		*/ TEXT start(SB),$0
1991/0625		CLI /* disable interrupts */ MOVW $NULLSEL,IDTR /* force shutdown on error */
1991/0626		/* point CPU at the interrupt/trap table */ LEAL idtptr(SB),AX /* MOVL (AX),IDTR /**/
1991/0625		/* point data segment at low memory */ XORL AX,AX MOVW AX,DS
1991/0626		/* MOVW AX,DS /**/
1991/0625		/* load gdt address (valid after paging) */
1991/0626		/* point CPU at the interrupt/trap table */
1991/0625		LEAL gdtptr(SB),AX MOVL -KZERO(AX),GDTR
1991/0626		/* MOVL (AX),GDTR /**/
1991/0625
1991/0614		CALL main(SB) /* never returns */
1991/0625/sys/src/9/pc/l.s:132,143 – 1991/0626/sys/src/9/pc/l.s:146,157
1991/0623		*/
1991/0622		alltrap:
1991/0623
1991/0625		PUSHL DS
1991/0626		/* PUSHL DS /**/
1991/0622		PUSHAL
1991/0625		MOVL $KDSEL, AX MOVW AX, DS
1991/0626		/* MOVW AX, DS /**/
1991/0614		CALL trap(SB)
1991/0622		POPAL
1991/0625		POPL DS
1991/0626		/* POPL DS /**/
1991/0625		ADDL $8,SP /* pop the trap and error codes */
1991/0622		IRETL