[unix-history] / usr / src / sys / tahoe / include / psl.h

/*      psl.h   4.4     84/01/31        */

/*
* TAHOE program status longword
*/

#define PSL_C           0x00000001      /* carry bit */
#define PSL_V           0x00000002      /* overflow bit */
#define PSL_Z           0x00000004      /* zero bit */
#define PSL_N           0x00000008      /* negative bit */
#define PSL_ALLCC       0x0000000f      /* all cc bits - unlikely */
#define PSL_T           0x00000010      /* trace enable bit */
#define PSL_IV          0x00000020      /* integer overflow enable bit */
#define PSL_FU          0x00000040      /* float underflow enable       */
#define PSL_DBL         0x00000080      /* f.p. prescision indicator    */
#define PSL_SFE         0x00000100      /* system-forced-exception */
#define PSL_IPL         0x001f0000      /* interrupt priority level */
#define PSL_CURMOD      0x01000000      /* current mode (all on is user) */
#define PSL_IS          0x04000000      /* interrupt stack */
#define PSL_TP          0x40000000      /* trace pending */

#define PSL_MBZ         0xbae0ffc0      /* must be zero bits */

#define PSL_USERSET     (PSL_CURMOD)
#define PSL_USERCLR     (PSL_IS|PSL_IPL|PSL_MBZ)