usr/src/sys/i386/include/psl.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * %sccs.include.noredist.c%
 *
 *      @(#)psl.h       5.1 (Berkeley) %G%
 */

/*
 * 386 processor status longword.
 */
#define PSL_C           0x00000001      /* carry bit */
#define PSL_PF          0x00000004      /* parity bit */
#define PSL_AF          0x00000010      /* bcd carry bit */
#define PSL_Z           0x00000040      /* zero bit */
#define PSL_N           0x00000080      /* negative bit */
#define PSL_ALLCC       0x000000d5      /* all cc bits - unlikely */
#define PSL_T           0x00000100      /* trace enable bit */
#define PSL_I           0x00000200      /* interrupt enable bit */
#define PSL_D           0x00000400      /* string instruction direction bit */
#define PSL_V           0x00000800      /* overflow bit */
#define PSL_IOPL        0x00003000      /* i/o priviledge level enable */
#define PSL_NT          0x00004000      /* nested task bit */
#define PSL_RF          0x00010000      /* restart flag bit */
#define PSL_VM          0x00020000      /* virtual 8086 mode bit */

#define PSL_MBZ         0xfffc7fb7      /* must be zero bits */
#define PSL_MBO         0x00000002      /* must be one bits */

#define PSL_USERSET     (PSL_IOPL)
#define PSL_USERCLR     (PSL_I|PSL_NT)