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/* 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.
*
* taken from the SPARC port of Linux,
*
* Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 2007 Daniel Hellstrom (daniel@gaisler.com)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __SPARC_PSR_H__
#define __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 */
#define PSR_PIL_OFS 8
#ifndef __ASSEMBLY__
/* Get the %psr register. */
extern __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;
}
extern __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;
extern __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 /* !(__SPARC_PSR_H__) */
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