psl.h

著名的AT&T UNIX v6 源码

/*
 	VAX program status longword
 */

#define PSL_C 0x1		/* carry bit */
#define PSL_V 0x2		/* overflow bit */
#define PSL_Z 0x4		/* zero bit */
#define PSL_N 0x8		/* negative bit */
#define PSL_T 0x10		/* trace enable bit */
#define PSL_IV 0x20		/* integer overflow enable bit */
#define PSL_FU 0x40		/* floating point underflow enable bit */
#define PSL_DV 0x80		/* decimal overflow enable bit */
#define PSL_IPL 0x1f0000	/* interrupt priority level */
#define PSL_PRVMOD 0xc00000	/* previous mode */
#define PSL_CURMOD 0x3000000	/* current mode */
#define PSL_IS 0x4000000	/* interrupt stack */
#define PSL_FPD 0x8000000	/* first part done */
#define PSL_TP 0x40000000	/* trace pending */
#define PSL_CM 0x80000000	/* compatibility mode */