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/* $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. */
static inline unsigned int get_psr(void)
{
unsigned int psr;
__asm__ __volatile__(
"rd %%psr, %0\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
: "=r" (psr)
: /* no inputs */
: "memory");
return psr;
}
static inline void put_psr(unsigned int new_psr)
{
__asm__ __volatile__(
"wr %0, 0x0, %%psr\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
: /* 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;
static inline unsigned int get_fsr(void)
{
unsigned int fsr = 0;
__asm__ __volatile__(
"st %%fsr, %1\n\t"
"ld %1, %0\n\t"
: "=r" (fsr)
: "m" (fsr_storage));
return fsr;
}
#endif /* !(__ASSEMBLY__) */
#endif /* (__KERNEL__) */
#endif /* !(__LINUX_SPARC_PSR_H) */
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