psr.h

来自「最新版的u-boot,2008-10-18发布」· C头文件 代码 · 共 98 行

/* 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 ([e-mail])
 * Copyright (C) 2007 Daniel Hellstrom ([e-mail])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#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__) */