psr.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:3k
- /* $Id: psr.h,v 1.15 1997/10/04 08:54:22 ecd Exp $
- * psr.h: This file holds the macros for masking off various parts of
- * the processor status register on the Sparc. This is valid
- * for Version 8. On the V9 this is renamed to the PSTATE
- * register and its members are accessed as fields like
- * PSTATE.PRIV for the current CPU privilege level.
- *
- * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
- */
- #ifndef __LINUX_SPARC_PSR_H
- #define __LINUX_SPARC_PSR_H
- /* The Sparc PSR fields are laid out as the following:
- *
- * ------------------------------------------------------------------------
- * | impl | vers | icc | resv | EC | EF | PIL | S | PS | ET | CWP |
- * | 31-28 | 27-24 | 23-20 | 19-14 | 13 | 12 | 11-8 | 7 | 6 | 5 | 4-0 |
- * ------------------------------------------------------------------------
- */
- #define PSR_CWP 0x0000001f /* current window pointer */
- #define PSR_ET 0x00000020 /* enable traps field */
- #define PSR_PS 0x00000040 /* previous privilege level */
- #define PSR_S 0x00000080 /* current privilege level */
- #define PSR_PIL 0x00000f00 /* processor interrupt level */
- #define PSR_EF 0x00001000 /* enable floating point */
- #define PSR_EC 0x00002000 /* enable co-processor */
- #define PSR_LE 0x00008000 /* SuperSparcII little-endian */
- #define PSR_ICC 0x00f00000 /* integer condition codes */
- #define PSR_C 0x00100000 /* carry bit */
- #define PSR_V 0x00200000 /* overflow bit */
- #define PSR_Z 0x00400000 /* zero bit */
- #define PSR_N 0x00800000 /* negative bit */
- #define PSR_VERS 0x0f000000 /* cpu-version field */
- #define PSR_IMPL 0xf0000000 /* cpu-implementation field */
- #ifdef __KERNEL__
- #ifndef __ASSEMBLY__
- /* Get the %psr register. */
- extern __inline__ unsigned int get_psr(void)
- {
- unsigned int psr;
- __asm__ __volatile__(
- "rd %%psr, %0nt"
- "nopnt"
- "nopnt"
- "nopnt"
- : "=r" (psr)
- : /* no inputs */
- : "memory");
- return psr;
- }
- extern __inline__ void put_psr(unsigned int new_psr)
- {
- __asm__ __volatile__(
- "wr %0, 0x0, %%psrnt"
- "nopnt"
- "nopnt"
- "nopnt"
- : /* no outputs */
- : "r" (new_psr)
- : "memory", "cc");
- }
- /* Get the %fsr register. Be careful, make sure the floating point
- * enable bit is set in the %psr when you execute this or you will
- * incur a trap.
- */
- extern unsigned int fsr_storage;
- extern __inline__ unsigned int get_fsr(void)
- {
- unsigned int fsr = 0;
- __asm__ __volatile__(
- "st %%fsr, %1nt"
- "ld %1, %0nt"
- : "=r" (fsr)
- : "m" (fsr_storage));
- return fsr;
- }
- #endif /* !(__ASSEMBLY__) */
- #endif /* (__KERNEL__) */
- #endif /* !(__LINUX_SPARC_PSR_H) */