lowlevel.inc

jserv写的orz小内核 有详细的注释

%define RMODE_SPACE_HI		1
%define RMODE_SPACE		(RMODE_SPACE_HI*0x10000)
%define RMODE_SPACE_SEG		(RMODE_SPACE_HI*0x1000)

%define KERNEL_START_HI		2
%define KERNEL_START		(KERNEL_START_HI*0x10000)
%define KERNEL_START_SEG	(KERNEL_START_HI*0x1000)

%define	MASTER_PIC	0x20
%define SLAVE_PIC	0xA0
%define	IRQ_LO_PORT	0x21
%define	IRQ_HI_PORT	0xA1
%define	MASK_TIMER	11111110b	; IRQ_LO
%define	MASK_KBD	11111101b	; IRQ_LO
%define	KBD_PORT_A	0x60
%define	KBD_PORT_B	0x61
%define KBD_PORT_C	0x64
%define END_OF_INTERR	0x20

%define	CF_OR	0000000000000001b
%define	CF_AND	1111111111111110b
%define	ZF_OR	0000000001000000b
%define ZF_AND	1111111110111111b