include/asm-sparc/psr.h

   1 /* $Id: psr.h,v 1.15 1997/10/04 08:54:22 ecd Exp $
   2  * psr.h: This file holds the macros for masking off various parts of
   3  *        the processor status register on the Sparc. This is valid
   4  *        for Version 8. On the V9 this is renamed to the PSTATE
   5  *        register and its members are accessed as fields like
   6  *        PSTATE.PRIV for the current CPU privilege level.
   7  *
   8  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
   9  */
  10
  11 #ifndef __LINUX_SPARC_PSR_H
  12 #define __LINUX_SPARC_PSR_H
  13
  14 /* The Sparc PSR fields are laid out as the following:
  15  *
  16  *  ------------------------------------------------------------------------
  17  *  | impl  | vers  | icc   | resv  | EC | EF | PIL  | S | PS | ET |  CWP  |
  18  *  | 31-28 | 27-24 | 23-20 | 19-14 | 13 | 12 | 11-8 | 7 | 6  | 5  |  4-0  |
  19  *  ------------------------------------------------------------------------
  20  */
  21 #define PSR_CWP     0x0000001f         /* current window pointer     */
  22 #define PSR_ET      0x00000020         /* enable traps field         */
  23 #define PSR_PS      0x00000040         /* previous privilege level   */
  24 #define PSR_S       0x00000080         /* current privilege level    */
  25 #define PSR_PIL     0x00000f00         /* processor interrupt level  */
  26 #define PSR_EF      0x00001000         /* enable floating point      */
  27 #define PSR_EC      0x00002000         /* enable co-processor        */
  28 #define PSR_LE      0x00008000         /* SuperSparcII little-endian */
  29 #define PSR_ICC     0x00f00000         /* integer condition codes    */
  30 #define PSR_C       0x00100000         /* carry bit                  */
  31 #define PSR_V       0x00200000         /* overflow bit               */
  32 #define PSR_Z       0x00400000         /* zero bit                   */
  33 #define PSR_N       0x00800000         /* negative bit               */
  34 #define PSR_VERS    0x0f000000         /* cpu-version field          */
  35 #define PSR_IMPL    0xf0000000         /* cpu-implementation field   */
  36
  37 #ifdef __KERNEL__
  38
  39 #ifndef __ASSEMBLY__
  40 /* Get the %psr register. */
  41 static inline unsigned int get_psr(void)
  42 {
  43         unsigned int psr;
  44         __asm__ __volatile__(
  45                 "rd     %%psr, %0\n\t"
  46                 "nop\n\t"
  47                 "nop\n\t"
  48                 "nop\n\t"
  49         : "=r" (psr)
  50         : /* no inputs */
  51         : "memory");
  52
  53         return psr;
  54 }
  55
  56 static inline void put_psr(unsigned int new_psr)
  57 {
  58         __asm__ __volatile__(
  59                 "wr     %0, 0x0, %%psr\n\t"
  60                 "nop\n\t"
  61                 "nop\n\t"
  62                 "nop\n\t"
  63         : /* no outputs */
  64         : "r" (new_psr)
  65         : "memory", "cc");
  66 }
  67
  68 /* Get the %fsr register.  Be careful, make sure the floating point
  69  * enable bit is set in the %psr when you execute this or you will
  70  * incur a trap.
  71  */
  72
  73 extern unsigned int fsr_storage;
  74
  75 static inline unsigned int get_fsr(void)
  76 {
  77         unsigned int fsr = 0;
  78
  79         __asm__ __volatile__(
  80                 "st     %%fsr, %1\n\t"
  81                 "ld     %1, %0\n\t"
  82         : "=r" (fsr)
  83         : "m" (fsr_storage));
  84
  85         return fsr;
  86 }
  87
  88 #endif /* !(__ASSEMBLY__) */
  89
  90 #endif /* (__KERNEL__) */
  91
  92 #endif /* !(__LINUX_SPARC_PSR_H) */